Note: Descriptions are shown in the official language in which they were submitted.
CA 02286491 1999-10-29
-1-
SEALING GASKET FOR A TRIGGER SPRAYER
~ckQround of the Invent'~n
(1) Field of the Invention
The present invention pertains to an improved
trigger sprayer apparatus. In particular, the present
invention pertains to improvements to a sprayer apparatus
of the type comprising a trigger for manipulation by a
user of the apparatus to dispense a spray or stream of
liquid from the apparatus. The improvements include a
venting system employing an elongated slot that allows
air to enter a liquid container connected to the appara-
tus as the apparatus dispenses liquid from the container,
a trigger member of the apparatus that provides reliable
operation and prevents the inadvertent disconnection of
the trigger member from the apparatus, a gasket connected
to the apparatus between the liquid container and the
apparatus, and a fluid conduit communicating with a noz-
zle orifice of the apparatus that centers a fluid spinner
of the apparatus relative to the orifice.
CA 02286491 1999-10-29
2
(2) Description of the Related Art
In prior art trigger sprayer apparatus for dispen-
sing liquid from containers, the typical sprayer appara-
tus is comprised of a sprayer housing having a nozzle for
dispensing liquid, a trigger mounted on the housing for
pivoting movement relative thereto, a pump chamber formed
in the housing, and a pump piston connected to the trig-
ger and received in the pump chamber for reciprocating
movement therein in response to pivoting movement of the
trigger. The reciprocating movement of the'pump piston
alternately draws fluid from the container into the pump
chamber and then forces the fluid out of the pump chamber
and through the nozzle in a spray or stream.
Very often trigger sprayer apparatus of the type
described above are manufactured separately from the
fluid containers with which they are used. The sprayer
apparatus are purchased by suppliers of liquids such as
window cleaning liquids, household cleaning liquids, and
others, who assemble the sprayer apparatus to their own
containers containing their liquids.
In attaching the sprayer apparatus to a liquid
container, a gasket is positioned between the sprayer
apparatus and container to prevent the liquid from leak-
ing from the connection. The gasket is typically in-
cluded as a component part of the sprayer apparatus. It
has been found in prior art trigger sprayer apparatus
that the gasket provided with the apparatus will often
become separated from the apparatus and lost in shipment.
To overcome this problem, gaskets have been developed
that are secured to the sprayer apparatus~prior to their
shipment. With the gasket secured to the sprayer appara-
tus, the gasket cannot be separated and lost during ship- '
ment.
Some,prior art gaskets have been held in position .
on sprayer apparatus by an insert. Some gaskets are
constructed with a layer of metallic foil covered by
CA 02286491 1999-10-29
3
another layer of a plastic material. 'The gasket is posi-
tioned inside an internally threaded connector of the
sprayer apparatus with the plastic and foil layers en-
gaged against the interior of the connector. The foil of
the gasket is then heated, causing the plastic layer to
melt and adhere the gasket to the connector of the spray-
er apparatus.
These types of prior art gaskets are disadvantaged
in that the additional processes involved in adding an
insert to the apparatus to hold the gasket, or adding
foil and plastic layers to the gasket material increase
the costs of producing the gaskets. Adding layers of -
plastic and foil increases the costs of the gasket and
requires the additional manufacturing processes of stam-
ping through the foil and plastic layers in forming the
gasket. What is needed to overcome these disadvantages
of prior art sprayer apparatus gaskets is a gasket that
can be attached to the sprayer apparatus in a more eco-
nomical way than that provided by the prior art.
Trigger mechanisms of prior art sprayer assemblies
are typically provided with a pair of laterally spaced
flanges at their upper ends that are inserted around
opposite lateral sides of a fluid dispensing nozzle at-
tached to the sprayer housing of the apparatus. The
flanges are also inserted between extensions of the
sprayer housing positioned adjacent the opposite lateral
sides of the fluid dispensing nozzle. The flanges are
provided with pivot pins on their exterior surfaces that
are received in sockets .in the extensions of the sprayer
housing. The insertion of the pivot pins in the sockets
provides a pivoting connection of the trigger member to
the sprayer housing.
The trigger members are typically constructed of a
resilient plastic that enables the pair of flanges to
deform toward each other as they are inserted between the
extensions of the sprayer housing. The lateral width of
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the fluid dispensing nozzle positioned between the flan-
ges is often dimensioned to limit the degree of deflec-
tion of the two flanges toward each other, thereby main-
taining the pivot pins of the, flanges in their pivoting
connections in the sockets of the sprayer housing exten-
sions. An example of this type of trigger is disclosed
in U.S. Patent No. 4,153,203. These prior art trigger
members and the manner in which they are connected with
the sprayer housing have been found to be disadvantaged
in that the clearances provided for the trigger flanges
between the sprayer nozzle and the extensions of the
sprayer housing have limited tolerances. If the clear--
ance is too large, the trigger flanges may flex inwardly
toward each other during use and become dislodged from
their pivot connections to the sprayer housing exten-
sions, resulting in the trigger member being separated
from the sprayer housing. If the clearance is too small,
the opposite lateral sides of the sprayer nozzle may
engage against the opposed interior surfaces of the trig-
ger member flanges. The resulting friction would resist
pivoting movement of the trigger member and could prevent
the trigger member from pivoting to its at rest position
under the force of its return spring. Hence, the clear-
ance provided in prior art trigger sprayer apparatus
between the laterally spaced flanges of the trigger mem-
ber and the opposite lateral sides of the sprayer nozzle
is critical and must be closely monitored during manufac-
ture to prevent the trigger from dislodging from the
sprayer housing and to ensure proper pivoting movement of
the trigger member without resistance due to friction.
What is needed to overcome these disadvantages of prior
art sprayer apparatus trigger members is a trigger member
having flanges designed to engage around the sprayer
nozzle of the apparatus with ample clearance, and design-
ed to be connected to the sprayer housing in a manner
CA 02286491 1999-10-29
that ensures that the trigger member cannot be dislodged
from the apparatus during use.
A typical trigger sprayer apparatus is also pro-
vided With some system of venting the liquid container
5 connected to the apparatus to allow air to enter the
container and occupy the internal volume vacated by li-
quid dispensed from the container by the sprayer appara-
tus. One typical venting system employs a resilient
diaphragm in the interior of the sprayer housing covering
a vent hole that communicates the interior of the con-
tainer with the container exterior, and a plunger con-
nected to the trigger member of the apparatus. On mani-
pulation of the trigger member, the plunger is inserted
through the vent hole and engages the diaphragm, moving
the diaphragm away from the vent hole and thereby venting
the interior of the container. Examples of this type of
venting system are disclosed in U.S. Patent Nos.
4,153,203; 4,230,277; 4,350,298 and 4,815,663. These
prior art venting systems have been found to be disad-
vantaged in that once the diaphragm has been displaced
from its position over the vent hole, the resiliency of
the diaphragm material does not enable it to immediately
reposition itself over the vent hole once the plunger has
been removed. This can result in liquid spilling from
the container through the vent hole should the apparatus
and connected container be knocked over on one side be-
fore the diaphragm is able to return to its original con-
figuration sealing over the vent hole.
Another prior art system of venting the container
interior employs a small piston that reciprocates with
movement of the trigger member in a tapered cylinder
formed in the sprayer housing. The cylinder has a taper-
ed interior bore and the periphery of the piston seats in
sealing engagement~in the narrow, forward end of the
interior bore when-the trigger member is moved to its at
rest position. The tapered cylinder has a vent hole at
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its larger, rearward end. The periphery of the piston
fits loosely inside the larger end of the cylinder inter-
ior bore when the trigger member is pivoted to dispense
liquid from the container, thereby enabling a flow of air '
through the cylinder bore around the periphery of the
piston and through the vent hole to the container inter-
ior. This prior art system of venting the container
interior has been found to be disadvantaged in that a
tapered core is necessary to mold the tapered interior
bore of the cylinder. Once the cylinder is formed over
the core, the core must be removed from the interior of
the cylinder through an opening at the narrow end of .the
tapered cylinder. This often results in splitting of the
cylinder at the narrow end as the core is removed. In
order to prevent splitting, the sprayer housing molding
process must be closely monitored which increases the
costs of producing the sprayer housings.
A still further system of venting the container
interior again employs a cylinder and a piston connected
to the trigger member and received in the cylinder. The
cylinder comprises several small ribs formed on and~ex-
tending axially over its interior surface at a rearward
end of the cylinder. The vent hole is also positioned at
the rearward end of the cylinder. The ribs engage the
periphery of the piston as it is reciprocated through the
cylinder in response to pivoting movement of the trigger
member. As the piston comes into engagement with the
ribs, the ribs separate the periphery of the piston from
the interior wall of the cylinder, thereby enabling ven-
ting air to flow past the piston to the vent hole com-
municating with the container interior. This prior art sys-
' tem of venting the container interior has ,been found to be .
disadvantaged in that the ribs in the cylinder interior de-
form the resilient material around the periphery of the piston. .
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The resiliency of the piston material does not allow the
piston to immediately return to its original configura-
tion. The deformation of the piston periphery prevents
the piston from providing a sealing engagement between
the periphery of the piston and the interior wall of the
cylinder, and allows liquid to flow through the defor-
mation between the piston and the cylinder interior wall
should the apparatus and attached container be knocked
over on one side.
Prior art sprayer apparatus have also employed
venting systems comprised of a cylinder with a piston
connected to the trigger member and contained inside the
cylinder, where the internal wall of the cylinder is
provided with a circular vent hole at an intermediate
position in the cylinder. The piston is formed with a
pair of spaced annular rings around the circumference of
the piston. The rings are separated by an annular groove
and straddle the vent hole of the cylinder when the trig-
ger is in the at rest position. Each of the pair of
rings engage in a sliding, sealing engagement with the
interior of the cylinder. As the piston reciprocates in
the cylinder from one side to the other side, the forward
most piston ring passes over the vent hole thereby ex-
posing the vent hole to the container exterior and ven-
ting the container interior. As the forward piston ring
travels back through the cylinder to the opposite side of
the vent hole, the vent hole is sealed from the exterior
of the container and no fluid can seep past the piston
should the apparatus and attached container be knocked
over on one side. An example of this type of venting
system is disclosed in U.S. Patent No. 4,072,252. This
system of the prior art has been found to be disadvan-
taged in that, as the piston travels back and forth over
the vent hole, the edges of the vent hole formed in the
cylinder interior wall produce scratches in the periphery
of the forward piston ring and damage its sealing engage-
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8
ment in the interior of the cylinder. These scratches
often enable liquid to flow from the container and bet-
ween the piston ring periphery and the internal wall of
the cylinder through the scratches when the apparatus and '
fluid container are knocked over on one side.
What is needed to overcome all of the above set '
forth disadvantages of prior art trigger sprayer appara-
tus venting systems is an improved venting system that
enables adequate venting of the container interior during
pumping operations performed by the trigger sprayer ap-
paratus by venting the container earlier in the pump
piston stroke and for a longer period of the pump piston
stroke, while also preventing liquid from leaking from
the container through the venting system should the ap-
paratus and connected fluid container be knocked over on
one side.
Prior art venting systems of the type discussed
above comprising a venting cylinder formed in the sprayer
housing of the trigger sprayer apparatus and a reciproca-
ting piston received in the vent cylinder have also been
found to be disadvantaged in that the molding of the
sprayer housing must be closely monitored to ensure that
no imperfections develop in the vent cylinder of the
housing. Prior art sprayer housings of this type are
typically formed with a fluid conduit to which the spray-
er nozzle of the apparatus is attached, a pump cylinder
in which the pump piston operated by the trigger member
is received, and the vent cylinder in which the vent
piston is received. The fluid conduit, pump cylinder and
vent cylinder are formed in the sprayer housing with the
axes of the conduit, pump cylinder and vent cylinder
parallel and coplanar with each other. In molding a
sprayer housing of this type from plastic material, ex-
treme care must be taken in order to avoid sinks from ,
forming in the interior surfaces of the pump cylinder and
vent cylinder as the molded plastic material of the
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sprayer housing cools. Very often in sprayer housings of
this type, sinks in the form of slight indentations in
the interior walls of the pump cylinder and vent cylinder
will form as the molded plastic material of the pump
cylinder and vent cylinder cools. The sinks produce
deformations in the interior surfaces of the pump cylin-
der and vent cylinder and prevent the pump piston and
vent piston peripheries from engaging in a sealing en-
gagement with the pump and vent cylinder interior sur-
faces. As a result, a trigger sprayer apparatus having a
sprayer housing with the sink imperfections formed in the
interior surfaces of its pump cylinder and vent cylinder
will often leak liquid through the sinks and around the
peripheries of the pump piston and vent piston when the
.apparatus and fluid container are tipped over onto one
side. 'What is needed to overcome this disadvantage of
prior art trigger sprayer apparatus is a trigger sprayer
apparatus constructed in a manner that prevents sink
imperfections from forming in the interior surfaces of
the pump cylinder and vent cylinder of the apparatus.
Prior art fluid sprayer apparatus also typically
comprise a fluid conducting conduit extending.through the
sprayer housing that supplies fluid to a nozzle orifice
of the apparatus. Fluid pumped by the apparatus through
the conduit is dispensed in either a stream or spray from
the nozzle orifice. Many prior art trigger sprayer ap-
paratus employ a fluid spinner that imparts a rotation to
the fluid as it travels through the conduit prior to its
being dispensed from the nozzle orifice. For the fluid
spinner to function properly, it must be centered rela-
tive to the center axis of the nozzle orifice. Many
prior art trigger sprayer apparatus are disadvantaged in
that they provide no system of ensuring that the fluid
spinner is centered relative to the nozzle orifice.
CA 02286491 1999-10-29
Summary of the Invention
The present invention overcomes all of the afore-
said disadvantages typically associated with prior art
trigger sprayer apparatus by providing an improved trig-
s ger sprayer apparatus comprising a gasket that is secured
to the apparatus, a trigger member that cannot be inad- -
vertently pulled and disconnected from the apparatus yet
provides ample clearance between it and the nozzle as-
sembly of the apparatus, a fluid container venting system
10 that vents air to the interior of the fluid container
connected to the apparatus early in the pump piston
stroke and for ~an extended period of the stroke while.-
preventing fluid from seeping through the venting system
should the apparatus and container be turned on one side,
and a fluid conduit in the nozzle assembly communicating
with the nozzle orifice that centers a fluid spinner
assembly relative to the nozzle orifice as the spinner
assembly is assembled in the fluid conduit.
The trigger sprayer apparatus of the present
invention is generally constructed of a sprayer housing
connected by an internally threaded connector to a 'fluid
container. A manually manipulated trigger member is
connected to the sprayer housing for pivoting movement
relative thereto. The trigger member reciprocates a
piston pump in a pump chamber in response to its pivoting
movement. The reciprocation of the piston pump draws
fluid from the interior of the container up to the spray-
er housing and pumps the fluid through a fluid spinner
channel and dispenses the fluid through a nozzle assembly
of the apparatus. A vent piston is connected to the pump
piston and reciprocates with the pump piston. When the
pump piston is caused to move in the pump chamber to
dispense fluid, the vent piston moves to a position in a
vent chamber where a vent opening is exposed to the ex-
terior of the sprayer housing and the interior of the
fluid container is vented. This allows air to enter the
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11
fluid container interior to fill that portion of the
volume vacated by fluid pumped from the container by the
sprayer apparatus.
A first improvement in the sprayer apparatus of
the present invention is provided by a gasket that is
positioned in the internally threaded connector of the
sprayer apparatus. The gasket provides a fluid-tight
seal at the connection of the sprayer apparatus to the
fluid container. The sprayer apparatus is provided with
a plurality of downwardly depending posts that extend
into the threaded connector and are each inserted into a
corresponding hole provided through the gasket. The
distal end of each post is then bent over or deformed in
some manner such as by heating, causing the post distal
end to retain the gasket on the sprayer apparatus. By
providing such a connection between the gasket and spray-
er apparatus, the gasket is prevented from becoming sepa-
rated from the sprayer apparatus during shipment.
An additional improvement of the sprayer apparatus
of the present invention is provided in the venting sys-
tem of the sprayer. A vent housing is provided in the
sprayer apparatus that is formed separately from a spray-
er housing of the apparatus . By forming the sprayer
housing and the vent housing separately, the cylindrical
pump chamber and the cylindrical nozzle conduit of the
sprayer housing, as well as the cylindrical vent chamber
formed in the vent housing, are produced more accurately.
Because the sprayer housing and vent housing are molded
separately, the~occurrence of sinks in critical areas
such as the interior walls of the cylindrical pump cham-
ber and the cylindrical vent chamber are eliminated,
providing smooth interior surfaces in the. pump chamber
and very chamber that maintain a sealing engagement with
the peripheries of the pump piston and vent piston.
A still further improvement is provided in the
venting system of the apparatus of the invention. The
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12
cylindrical vent chamber of the vent housing.receives the
vent piston connected to the pump piston for reciproca-
ting movement therein. The vent piston has a tapered
configuration with the narrow end of the piston being
connected to the ptfmp piston and the periphery of the
large end of the piston engaging in sealing engagement
with the vent chamber interior surface. A vent slot is
provided in an intermediate position in the sidewall of
the vent chamber, and the reciprocating movement of the
vent piston over the vent slot controls the venting of
the fluid container interior. The axial length of the _
vent slot in the vent chamber is determined so that the
large sealing end of the tapered vent piston does not
pass over a rearward edge of the vent slot as the piston
reciprocates through the vent chamber. This ensures that
the peripheral surface at the large end of the piston
will not be scratched or damaged by passing over the edge
of a vent opening as is the case in many prior art ven-
ting systems. The tapered configuration of the vent
piston also enables venting of the container interior
earlier in the reciprocating stroke of the vent piston.
As soon as the large end of the vent piston passes over
the forward edge of the vent slot in the vent chamber,
the container interior is vented due to the tapered con-
figuration of the vent piston. The tapered configuration
of the vent piston also facilitates the sliding of the
large end of the vent piston over the forward edge of the
vent slot when the piston is returning to its at rest
position in the vent chamber sealing the vent slot from
the container exterior.
The trigger member of the sprayer apparatus of the
present invention is also improved over prior art trigger
members. The trigger member is formed with a pair of
laterally spaced flanges at its upper end. The flanges
are provided with pivot posts on their exterior surfaces
that engage in sockets provided for the posts on the
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sprayer housing. The engagement of the posts in the
sprayer housing sockets provides a pivoting connection
between the trigger member and the sprayer housing that
enables the trigger member to pivot in response to manual
manipulation and reciprocate the pump cylinder in the
pump chamber and the vent cylinder in the vent chamber.
A reinforcing bar is provided extending across the top of
the pair of lateral spaced flanges. The bar is position-
ed between the mutually opposed interior surfaces of the
flanges just behind the pivot posts on the exterior sur-
faces of the flanges. The bar reinforces the flanges and
resists their being deformed toward each other which
could cause the trigger member to come loose and separate
from the sprayer housing. The bar also extends across a
top surface of the sprayer housing and thereby provides
an additional restraint against the trigger member being
separated from the sprayer housing.
A still further improvement in the trigger sprayer
apparatus of the present invention is provided in the
nozzle assembly and fluid spinner assembly of the appara-
tus. The nozzle conduit of the nozzle assembly contains
the fluid spinner assembly which includes a fluid spinner
that imparts rotation to the fluid pumped through the
conduit. The fluid spinner rotates the fluid just prior
to its being dispensed through the nozzle orifice of the
nozzle assembly. The exterior of the fluid spinner is
tapered at the end of the spinner that is positioned
toward the nozzle orifice with the spinner assembly in-
serted into the nozzle conduit of the nozzle assembly.
The interior surface of the nozzle conduit is provided
with a taper as it approaches the nozzle orifice. The
tapered interior surface of the nozzle conduit engages
the tapered exterior surface of the spinner assembly and
centers the fluid spinner relative to the nozzle orifice
as the fluid spinner is inserted into the conduit, and
thus ensures proper operation of the fluid spinner.
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By incorporating the several improved features
recited above, the trigger sprayer apparatus of the pre-
sent invention overcomes disadvantages commonly associa-
ted with prior art trigger sprayer apparatus. '
Erief Description of the Drawing' FiQUres
Further objects and features of the present inven-
tion are revealed in the following detailed description
of the preferred embodiment of the invention and in the
drawing figures wherein:
Figure 1 is an elevation view, in section, of the
trigger sprayer apparatus of the present invention;
Figure 2 is a partial view, in section, of the"
nozzle assembly of the trigger sprayer apparatus of the
invention;
~ Figure 3 is a partial view, in section, of the
trigger member of the trigger sprayer apparatus taken
along the line 3-3 of Figure 1;
Figure 4 is a partial view, in section, of the
trigger member of the sprayer apparatus taken along the
line 4-4 of Figure 3;
Figure 5 is a partial top view of the trigger
member of the sprayer apparatus;
Figure 6 is a bottom view of the sprayer apparatus
vent housing taken along the line 6-6 of Figure 1;
Figure 7 is a partial exploded view of the vent
housing and gasket of the sprayer apparatus;
Figure 8 is a bottom view of the connector and
gasket of the trigger sprayer apparatus;
Figure 9 is a partial view, in section, of the
connector, gasket and vent housing of the trigger sprayer
apparatus; and
Figure 10 is a partial view, in section, of the
venting system of the trigger sprayer apparatus.
Description of the Preferred Embodiment -
The trigger sprayer apparatus 10 of the present
invention is generally comprised of a sprayer housing 12,
CA 02286491 1999-10-29
a vent housing 14, a pump piston 16 and interconnected
vent piston 18, a trigger member 20, a nozzle assembly
22, an internally threaded connector~24 that connects the
sprayer apparatus 10 to a fluid container 26, and a fluid
5 supply tube 28 that extends from the sprayer apparatus 10
down into the interior volume of the container 26. An
ornamental shroud 30 covers over the sprayer housing 12
and vent housing 14. Several features of the component
parts of the trigger sprayer apparatus 10 listed above
10 are conventional and will not be described in detail for
simplicity, with the detailed descriptions being directed
to the improvements of the component parts provided by.-
the present invention.
The sprayer housing 14 is molded of a plastic type
15 material and includes several separate interior chambers
connected in communication with each other. Positioned
toward the top of the sprayer housing 12 is a fluid spin-
ner channel 32. The channel 32 has a cylindrical inter-
ior surface with an opening 34 at its forward end, or
left hand end as viewed in Figure 1, for receiving the
nozzle assembly 22 yet to be described. An end wall 36
closes off the right hand end of the channel 32 and a
valve seat 38 is provided through the center of the end
wall 36. The valve seat 38 seats a valve head of a fluid
spinner assembly yet to be described.
The valve seat 38 communicates the interior of the
channel 32 with the interior of a hollow fluid supply
column 42 of the sprayer housing 12. The fluid supply
column 42 extends vertically downward from the top of the
sprayer housing 12 along the rearward side of the sprayer
housing to a cylindrical vent housing chamber 44 provided
' at the bottom of the sprayer housing. An opening 46 is
provided at the bottom of the vent housing chamber 44 to
receive the vent housing 14 yet to be described. An
additional opening 48 is provided through a forward por-
tion of the vent housing chamber sidewall toward the top
CA 02286491 1999-10-29
16
of the vent housing chamber to accommodate the vent hous-
ing piston 18 yet to be described.
A cylindrical pump chamber 52 is formed ih the
sprayer housing 12 between the fluid spinner channel 32
and the vent housing chamber 44 and forward of the fluid
supply column 42. The pump chamber 52 has an opening 54 -
at its forward end to receive the pump piston 16. An end
wall 56 closes off the rearward end of the pump chamber.
A fluid channel 58 is provided through the pump housing
end wall 56 communicating the interior volume of the pump
chamber with the interior of the fluid supply column 42
at the rear of the sprayer housing 12. -
The first improvement of the trigger sprayer
apparatus of the present invention over prior art sprayer
apparatus is provided by the discrete vent housing 14
that is assembled into the sprayer housing 12. What is
meant by discrete is that the vent housing 14 and sprayer
housing 12 are produced as completely separate component
parts of the sprayer apparatus of the invention and then
assembled. The vent housing 14 is formed with a vertic-
ally extending fluid conducting column 62 that is insert-
ed into the interior o.f the fluid supply column 42 of the
sprayer housing 12. The vent housing column 62 is formed
with ribs 64 on its exterior surface. The ribs 64 engage
between ribs 66 formed in the interior surface of the
sprayer housing fluid supply column 42 when the vent
housing column 62 is inserted into the sprayer housing
column 42 to securely snap fit the vent housing inside
the sprayer housing. The circumference of the vent hous-
ing column 62 just above the ribs 64 is dimensioned to
seat securely inside the interior of the sprayer housing
column 42 and provide a sealing engagement between the -
exterior surface of the vent housing column and the in-
terior surface of the sprayer housing column. Just above -
the sealing engagement between the exterior of the vent
housing column and the interior of the sprayer housing
CA 02286491 1999-10-29
17
column the circumference of the vent housing column is
reduced to provide a fluid conducting channel 72 between
the exterior of the vent housing column and the interior
of the sprayer housing column. The channel 72 communi-
Gates the pump chamber fluid channel 58 With the fluid
spinner channel valve seat 38.
A tapered check valve seat 74 is provided at the
top most end of the vent housing column 62 and a ball
check valve 76 is provided in the check valve seat 74.
The ball check valve 76 controls the direction of flow of
liquid through the vent housing column, permitting the
liquid to flow out of the vent housing column 62 through
the check valve seat 74, and preventing the flow of li-
quid back through the vent housing column through the
check valve seat. As seen in the drawing figures, the
fluid supply tube 28 is secured in the interior of the
vent housing column 62 and depends downward from the vent
housing column and into the interior of the fluid con-
tainer 26 connected to the sprayer apparatus by the con-
nector 24.
The bottom of the vent housing column 62 is formed
integrally with a base 82 of the vent housing. The vent
housing base 82 is cylindrical and fits snug inside the
vent housing chamber 44 of the sprayer housing 12. A
cylindrical vent chamber 84 is formed extending transver-
sely into the top of the vent housing base 82. As seen
in Figure 10, the vent chamber 84 has an opened for-
ward end 86 and a closed rearward end 88. The opening
86 at the forward end, or left hand end as viewed in the
drawing figures, of the vent chamber is aligned with the
top opening 48 of the sprayer housing 12 vent housing
chamber 44. The vent chamber 84 has a circular cross
section with a diameter that remains constant between the
forward end 86 and rearward end 88 of the vent chamber.
A vent opening 92 is provided through the bottom
of the vent chamber sidewall. The vent opening 92 is
CA 02286491 1999-10-29
18
configured as a narrow slot that extends axially through
the vent chamber sidewall. As seen in the drawing
figures, the slot 92 is positioned at an intermediate
portion of the vent chamber sidewall between the open end '
86 and closed end 88 of the vent chamber. The shot 92
communicates the interior of the vent chamber 84 with the -
interior of the vent housing base 82 and also the inter-
ior of the fluid container 26 connected to the sprayer
apparatus 10.
Formed projecting from the interior surface of the
vent housing base 82 are a plurality of ribs 96. The
ribs 96 have a general rectangular configuration and
extend vertically over the interior surface of the vent
housing base 82. Formed at the bottom of each of the
ribs is a post 98. As seen in the drawing -figures, the
posts 98 are formed adjacent the remote edge of the ribs
96 from the interior surface of the vent housing base 82.
The width of each rib 96 spaces the post 98 depending
from the rib from the interior surface of the vent
housing base 82 and toward the center of the vent hous-
ing. The positioning of each of the ribs 96 and their
associated posts 98 relative to the vent housing base 82
can best be seen in Figure 7.
An annular rim 102 is formed at the bottom of the
vent housing base 82 and projects radially from the bot-
tom of the base. The internally threaded connector 24
has an annular lip 104 that engages over the top surface
of the vent housing rim 102. With reference to Figure 9,
the engagement of the connector lip 104 over the vent
housing rim 102 provides a connection between the vent
housing and connector that enables the connector to ro-
tate relative to the vent housing. By positioning the
connector 24 over the externally threaded neck of a fluid
container 26 and rotating the connector, the sprayer ap-
paratus 10 of the present invention is connected to the
liauid container.
CA 02286491 1999-10-29
19
The sprayer housing 12 and vent housing 14 des-
cribed above are completely separate and discrete com-
ponent parts of the present invention. The sprayer hous-
ing and vent housing are formed of a plastic material
independently of each other, and then are assembled to-
gether in assembling the sprayer apparatus of the present
invention. By providing a separate sprayer housing 12
and vent housing 14, the sprayer apparatus of the present
invention can be produced in a manner that significantly
reduces the occurrence of deformations or imperfections
in the component parts of the sprayer apparatus than has
been heretofore~available in the prior art. Molding-the
sprayer housing 12 and vent housing 14 separately enables
the cylindrical interior surface of the pump chamber 52
and the cylindrical interior surface of the vent chamber
84 to be molded more accurately. Because the sprayer
housing and vent housing are molded separately, a lesser
amount of plastic material is needed to mold each of
these component parts of the sprayer apparatus. Because
less plastic material is used in molding the component
parts, the shrinkage of the material as the separate
molded parts cool is significantly reduced. This elimi-
nates the occurrence of deformations or sinks in critical
areas of these component parts, such as the interior
walls of the cylindrical pump chamber 52 and the cylind-
rical vent chamber 84, providing smooth interior surfaces
in the pump and vent chambers that maintain a sealing
engagement with the peripheries of the respective pump
and vent pistons.
The gasket 106 of the present invention is speci-
fically configured to be secured to the sprayer apparatus
10 and remain secured to the apparatus during shipment.
The configuration of the gasket 106 is best seen in
Figure 7. The gasket has a circular circumference dimen-
sinned to seat in sealing engagement in the interior of
the connector 24 engaging the underside of the vent hous-
CA 02286491 1999-10-29
ing base 82. In this position of the gasket, it provides
a seal between the sprayer apparatus 10 and the liquid
container 26 connected to the apparatus by the connector
24. As seen in Figure 7, the gasket 106 is provided with
5 a plurality of holes. A first set of holes 108 is pro-
vided through the gasket 106 in positions corresponding
to the positions of the posts 98 of the vent housing ribs
96. The width of the vent housing ribs 96 spaces the
posts 98 well inside the bottom of the vent housing rim
10 102 so that the gasket holes 108 provided for the posts
98 are spaced from the peripheral portion of the gasket
top surface that engages in sealing engagement with the
underside of the rim. A larger hole 112 is provided
through the gasket to accommodate the fluid supply tube
15 28 extending from the sprayer apparatus 10, through the
hole 112, and into the interior of the liquid container
26. The larger hole 112 is dimensioned large enough to
enable the interior of the liquid container 26 to be
vented through the gasket and the vent chamber 84 as will
20 be explained.
In assembling the gasket 106 to the sprayer ap-
paratus 10, each of the rib posts 98 of the vent housing
are inserted into one of the first set of holes 108 in
the gasket. The cross sections of~each of the posts 98
may be dimensioned larger than the diameters of the holes
108 to provide a secure friction engagement between the
posts and holes that secures the gasket 106 to the bottom
of the vent housing 14. In the preferred embodiment, the
posts 98 have a predetermined length that extends the
distal ends of the posts beyond the bottom surface of the
gasket 106 when inserted through the gasket holes 108.
The distal ends of the posts 98 depending below the gas- -
ket 106 are deformed such as by either bending them to
one side or heating them to prevent the posts from being
retracted back out through the gasket holes 108. In the
preferred embodiment, the distal ends of the posts 98 are
CA 02286491 1999-10-29
21
heated to form enlarged heads on the distal ends of each
of the posts. The enlarged heads have cross sectional
dimensions larger than the diameters of the holes 108,
thereby preventing the heads from being retracted back
through the holes and securing the gasket 106 to the
bottom of the vent housing 14. In this manner, the im-
proved trigger sprayer apparatus 10 and the improved
gasket 106 of the present invention work together to
secure the gasket to the sprayer apparatus and prevent
the gasket from being separated from the apparatus during
shipment.
The cylindrical vent chamber 84 of the vent hous-
ing receives the vent piston 18 for reciprocating move-
ment therein. As explained above, the vent chamber 84
has a circular cross section with a diameter that is
constant between its forward, opened end 86 and its rear-
ward, closed end 88. The vent slot 92 is formed through
a sidewall of the vent chamber intermediate the opened
and closed ends. The dimensions of the vent slot 92 can
best be seen in Figure 6. By providing an elongated slot
as the vent opening in the sidewall of the vent chamber
84, the interior of the liquid container 26 is vented to
the exterior of the container through the vent slot 92
much earlier in the reciprocating stroke of the vent
piston 18 than is provided by circular vent openings of
the prior art. The configuration of the vent piston 18
also serves to vent the interior of the liquid container
26 much earlier in the stroke of the vent piston than has
been heretofore available in the prior art.
As can best be seen in Figure 10, the peripheral
surface 116 of the vent piston 18 is tapered with the
forward end 118 of the piston connected to the pump pis-
ton 16 by the arm 122 being narrower than the rearward
end 124 of the vent piston. The piston periphery at the
larger, rearward end of the vent piston 124 engages in a
CA 02286491 1999-10-29
22
sealing engagement against the interior surface of the
vent chamber 84.
In the position of the vent piston 18 in the vent
chamber 84 shown in Figure 1, the vent piston obstructs
the communication of air from the exterior of the liquid
container through the vent slot 92 and to the interior of
the vent housing 14 and the interior of the liquid con-
tainer 26. As the trigger member of the apparatus is
depressed, the pump piston 16 and vent piston 18 move to
the right as viewed in Figure 1. As the larger, rearward
end 124 of the vent piston 18 passes over the forward
edge 126 of the vent slot 92, the tapered configuration
of the vent piston peripheral surface 116 exposes the
slot opening 92 to the exterior of the apparatus 10 and
vents the interior of the liquid container 26 through the
slot 92. Unlike prior art sprayer apparatus employing
reciprocating vent pistons in cylindrical vent chambers,
the particular configurations of the tapered vent piston
16 and the elongated vent slot 92 of the apparatus of the
present invention enable the interior volume of the li-
quid container 26 to be vented to the exterior of the
apparatus 10 as soon as the rearward end 124 of the vent
piston passes over the forward edge 126 of the slot 92 in
the stroke of the vent piston 16 in the vent chamber.
In a prior art venting system of the type compris-
ing a cylindrical piston received in a vent chamber hav-
ing a circular vent hole, to vent the system as early in
the vent piston stroke as the slot 92 of the present
invention, the vent hole would need to be moved to a
forward position in the vent chamber so that the entire
piston would pass over the hole early in the piston
stroke. Moving the vent hole of the prior art venting
system forward would require the vent piston to pass
completely over the hole, resulting in the rearward end
of the piston passing over the rearward edge of the vent
hole. The passing of the rearward end of the vent piston
CA 02286491 1999-10-29
23
over the back edge of the vent hole could cause damage to
the peripheral surface of the vent piston as it passes
over the hole back edge.
Hy providing the elongated slot 92 of the present
invention in lieu of a circular hole, the slot axial
length is extended to provide sufficient open area to
vent the container interior and also to space the back
edge 128 of the slot 92 beyond the length of travel of
the vent piston 18 in the vent chamber 84. The rearward
most extent of travel of the vent piston 18 of the pre-
sent invention is shown in Figure 10 of the drawing
figures. In Figure 10 it can be seen that the rearward-
end 124 of the vent piston 18 never passes over the rear-
ward edge 128 of the slot 92. In this manner, the vent
slot 92 of the present invention ensures that the rear-
ward edge 128 of the slot will not cause damage to the
peripheral surface of the vent piston 18 as the piston is
passed over the slot to vent the container interior.
The trigger member 20 of the present invention
also comprises improvements over prior art trigger mem-
bers. The lower end 130 of the trigger member is shaped
in the configuration of a handle. The handle 130 is
engaged by the fingers of a user of the apparatus 10 to
pivot the trigger member relative to the sprayer housing
12, and thereby pump fluid from the apparatus by recipro-
cation of the pump and vent pistons 16, 18 in their res-
pective chambers. A coiled spring 132 in the pump cham-
ber 52 returns the pump and vent pistons 16, 18 and the
trigger member 20 to their at rest positions shown in
Figure 1. The operation of the pump piston 16 in dispen-
sing liquid from the apparatus is conventional.
As is best seen in Figures 3-5, the upper end of
~~~the trigger member 20 has a pair of laterally spaced
flanges 134, 136 formed thereon. The flanges 134, 136
extend upward around opposite lateral sides of the spray-
er housing fluid spinner channel 32. As can be seen in
CA 02286491 1999-10-29
24
Figures 3 and 5, the lateral spacing 137 between the
flanges 134, 136 provides ample clearance between the
mutually opposed interior surfaces of the flanges and the
opposite lateral sides of the fluid spinner channel 32
and nozzle assembly 22. Each of the flanges 134, 136 has
a pivot past or pin 138, 142 formed on its exterior sur-
face. The pivot pins are formed coaxially with each
other and at a rearward corner of the flanges as seen in
Figure 4. Each of the pivot pins 138, 142 engage in a
socket formed in extensions 144, 146 of the sprayer hous-
ing 12 projecting over the opposite exterior surfaces of
the flanges 134, 136. Figure 5 is a partial top view of
the flanges 134, 136 of the trigger member and their
pivoting connection to the sprayer housing extensions
144, 146, with the shroud 30 removed. The engagement of
the pivot pins 138, 142 in the sockets of the sprayer
housing extensions 144, 146 provides the pivoting connec-
tion of the trigger member 20 to the sprayer housing.
The extensions 144, 146 of the sprayer housing are
formed of the same plastic material employed in construc-
ting the sprayer housing. As such, the extensions 144,
146 of the sprayer housing have a resiliency that permits
the extensions to be deformed away from each other while
inserting the trigger member flanges 134, 136 between the
extensions and around the fluid spinner channel 32 of the
sprayer housing with the nozzle assembly 22 removed from
the forward end of the channel 32. When the trigger
member is positioned relative to the sprayer housing .
.extensions 144, 146 so that the pivot pins 138, 142 are
positioned in the sockets of the extensions, the resi-
liency of the sprayer housing extensions 144, 146 causes
' the extensions to return to their at rest configuration
shown in Figures 3 and 5 and retain the trigger member in
its pivoting connection to the sprayer housing.
A retention bar 148 is provided on the trigger
member 20 of the present invention. As seen in the draw-
CA 02286491 1999-10-29
ing figures, the retention bar 148 extends between the
opposed interior surfaces of the trigger member flanges
134, 136 just behind the pivot pins 138, 142 formed on
the exterior surfaces of the flanges. The retention bar
5 148 serves to maintain the lateral spacing between the
trigger member flanges 134, 136 and thereby maintain
engagement of the pivot pins 138, 142 in the sockets
provided for the pins in the extensions 144, 146 of the
sprayer housing. Additionally, the positioning of the
10 retention bar 148 over the top of the sprayer housing
fluid spinner channel 32 prevents the trigger member 20
from being disconnected from the sprayer housing by pu~.-
ling downward on the trigger member. In this manner, the
retention bar 148 of the improved trigger member 20 main-
15 tains the lateral spacing between the trigger member
flanges 134, 136 and the apposite lateral sides of the
sprayer housing fluid spinner channel 32 and prevents the
trigger member 20 from being inadvertently removed from
its pivoting connection to the sprayer housing.
20 The nozzle assembly 22 of the present invention is
inserted into the open left hand end 34 of the sprayer
housing fluid spinner channel 32. As shown in Figure 1,
a fluid spinner assembly 152 having a fluid spinner 154
at its left or forward end is contained in the spinner
25 channel 32 between the valve seat 38 at the right end of
the channel and the nozzle assembly 22 at the left end of
the channel. The fluid spinner 154 is received in a fluid
conducting conduit 156 (shown in Figure 2) in the interior
of the nozzle assembly 22 that communicates the fluid spin-
ner channel 32 of the sprayer housing 12 with the nozzle or-
ifice 158 of the nozzle assembly 22. The fluid spinner has
- an exterior surf ace 160 with a constant circumference along
its length except for a portion of the exterior surface 162
adjacent the forward or left end of the spinner. The cir-
cumference of the spinner surface 162 is slightly less
than the internal circumference of the nozzle conduit 156
CA 02286491 1999-10-29
26
to facilitate the assembly of the spinner in the conduit.
The portion 162 of the spinner exterior surface tapers as
it approaches the left end of the spinner 154. As is
best seen in Figure 2, as the fluid conduit 156 of the
nozzle assembly 22 approaches the nozzle orifice 158, a
portion of the nozzle conduit also tapers as it approach-
es the nozzle orifice 158. The tapering configuration of
the nozzle conduit portion 164 is complementary to the
tapering configuration of the fluid spinner portion 162.
By inserting the fluid spinner 154 into the tapered por-
tion 164 of the nozzle conduit, the tapered portion 164
adjacent the forward most end wall 166 of the nozzle con-
duit engages against the tapered portion 162 of the fluid
spinner and centers the fluid spinner 154 relative to the
nozzle orifice 158. By centering the fluid spinner 154
relative to the nozzle orifice 158, the improved nozzle
assembly 22 of the present invention ensures that the
fluid spinner imparts the proper rotation to the fluid
passed through the nozzle conduit 156 and the nozzle
orifice 158.
While the present invention has been described by
reference to a specific embodiment, it should be under-
stood that modifications and variations of the invention
may be constructed without departing from the scope of
the invention defined in the following claims.
