Note: Descriptions are shown in the official language in which they were submitted.
~QY 01 ~g~ 14:44 KRNE/D~LsI~ER&ET P.Z/19
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DOUBLE ACTING PUMP
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A need for improved trigger sprayers and
particularly double acting trigger sprayers has been
clearl.y established in the packaging industry.
However, the object has always been to develop a
trigger sprayer that is cost e~fec~ive and possesses
a more forceful ~pray and greater output per stroXe
which could be readily adjusted. Of course such
triggér pu~pg should pre~erably not be restrictedito
particu~ar products to be dispensed and should posse~s
the abil ity to dispense petroleum based products.
Pumps of this varlety because of con~umer preference,
must possess eye appeal to be commercially feasi~le.
_UMMARY Og $~E INVENTTON
A principal object of the present invention is to
provide a cost e~Sective, reliable, double ac~ing
trigger actuated piston pump with the foregoing
characteristics that permits a full stroke wit~
relatively more le~erage but with comfort ~or high
volume delivery during both the pressure and suction
stroXes at relatively high pres~ure without concern
over product compatibility while being a shipper which
lends to its commercial acceptability.
~R~EF DESCRSPT~ON OY THE: DEU~ NG8
Figure 1 is a side elevational vie~ of the double
acting trigger actuated pump of this invention at the
start of the press~re stroke with certain parts ~roken
and removed and sectioned;
Figure 2 is a similar view during the pres~ure
stroke with the bottle head space cable of being
11RY 01 '91~ 14:44 KRNE/DRLSI~1ER&ET P.3/19
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~ented with product being dispensed ~rom the pump
chamber;
- Figure 3 is a sim~lar view during the suction
stroke with the product drawn into the primary pump
chamber with the product being dispensed from the
supplemental pump chamber,
DBTA~L~D DE8CR~PTIO~
In the drawin~s a double acting trigge~ actuated
pump lO is shown associa~ed with the tbreaded neck 12
of container or bottle 14 containing the product to be
di~pensed. Towards this end an internally threaded
cap 16 extends across the opening of the neck 12 and
threadedly mates therewith in securing the pump lO on
bottle 14. The cap 16 secures the pump base 18 and
seals it across the opening of the neck 12 by engaging ~;
the circumferentially extending lip 20. ~ase ~8
includes a downwardly depending boss 22 which supports
dip tube 24, which communicates with passage 26 for
product ~low. The base is also provided with vent
opening 28 cooperating in venting the head space of
the bottle 14.
~ he pump lO is provided with an ou~er shell 30 and
a concentric inner shell 32 both suppor~ed on base 18 ;
and both having a closed inner end 30a and 32a
respectful}y. ~he outer shell 30 and inner shell 3~
define a product chaFber 34 which communic~tes with
passage 26 for reception o~ product to be dispensed.
The vent opening 28 extends through the inner shell 32
~or eventual communication with the atmosphere as will
be described shortly. The inner end 32a of inner
shell 32 i~ provided with a valve seat 36 which
receives a ~all check valve 38 for closing of2 pump
chamber 40 ~ithin inner shell 32 and isolat1ng it from
the product chamber 34 during the pressure stroke.
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MhY 01 '90 14: 44 K~INE/D~LSIMER&ET P. 4/19
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~he valve 38 will open to permit product to enter the
primary pump c~. mber 40 ~rom the product chamber 34
during the section stroke. ~he outer open ends of the
outer shell 30 and inner shell 32 are provided with a
retaining ring 41 which retains a spaced concentrical
relationship of the shell parts and at the same time
cooperates in maintaining the coaxial relationship of
~he piston 42. Mo~e importantly, this retaining ring
41 cooperates with the piston 42 and providing a
supplemental pump chamber which contributes to the
double action of the pump 10. The piston 42 includes
an inner double pis~on seal 44 having a pair of
seal~ng lip~ 46 and 48 which form slidlng seals with
the interior of the inner shell 32. ~he piston 42 is
also provided with a coaxial bore 50 in the piston rod
52. The piston rod i5 pro~ided with a sealing lip 53
which engages with the retaining ring 41 in sealing
the vent opening 28 when the pump is in it~ shipping
condi~ion as depicted in Figure 1. A piston return
spring 49 is biased against the double piston seal 44 ~ ;
and the inner shell wall 32a. It is also contemplated
that this spring could be readily externally mounted.
The outer end 54 of the piston rod 52 mounts a
discharge no2zle 56 which may be of any suitable
des~gn to gene~ate the desired discharge patterns.
The double piston ~eal 44 is provided with a valve
seat 58 coaxlal with the bore 50 in the piston rod and
cooperates with a ball check valve 60. The valve 60
assumes a closed position during the suction stro~e
and unseats during ~he pressure stroke.
In order to activate the piston 42, d trigger
mechanism 62 is employed. ~he trigger mechanism 62 ;~
includes a trigger 64 suitab~y pivoted at 65 to the
trigger cupport 66 which may be inte~ral with ~he
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~ Y 01 '90 14:45 K~lNE/DQLSI~1~R&ET-- p 5/19
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outer shell 30. ~he trigger 64 is provided with an
actuator surfacc ~8 designed to engage piston actuated
plate 70 extending la~erally from piston rod 52. The
zone of engagement or the trigger surface 68 ànd the
plate 70 is of a sliding nature to provide as near as
possible, a direction of force parallel to the axis of
the piston rod 52 as the trigger 64 is pulled and the
piston 42 is moved axially from its retracted position
to its forward position during the pressure stroke.
In order to obtain dispensing or discharg~ of
product during the suc~ion stroke, a s~pplemental pump
chamber 74 is defined between exterior surfaces o~ the
piston rod 52 and internal surfaces of the inner shell
32 and the in~ernal sealing lip 16 of th~ retaining
ring 41. Access to the supplemen~al pump chamber 74
is obtained through lateral passages 78 at the ~orward
end of the piston rod 52 and a clearance 80 between
~orward circu~ferentlally extending surfaces of the
piston rod 52 and internal surfaces of the inne~ shell
32.
In operation of ~he pump lO, i~ will be assumed
that initially, ~he pump will be ~ully p~imed with
product to be dispensed in the primary pump cham~er
and the pi5~0n 42 is ln its fully retracted
position as shown in figure l. In this po~i~ion,
which is also the end of the suction stroke or start
of the pressure stroke, the ball 38 will be sealed
against seat 36, the vent ~8 will be closed to the
atmosphere. In order to dispen~e product, the trigger
64 will be pulled and the sliding engagemen~ of the
actuation surface 68 against the plate 70 will force
the piston rod ~2, and, consequently, the double
piston seal 44 ~orwardly as shown in Figure 2. $his
movement will initiate the pressure stroke with the
rl~Y 01 ' 90 14: 45 Kf~NI~/DRLSI~1ER&ET P . 6/19
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product being forced out of the chamber 40, bypassing
unseated ball v_lve 60, through bore 50 out through
the nozzle S6 and into the desired discharged pattern
onto ~he selected surface. In addition product will
flow through the lateral passages 78 through clearance
80 into the supplemental pump chamber 74. As the
t~igger 64 ls pul.led further causing the double piston
seal 44 to bottom in the pump chamber 40 if this be
the desired or selected stroke of the piston. It will
be noted that during this move~ent, the vent passage
28 will be opened to vent the container headspace to
atmosphere to replace product dispensed with air.
At the start of the suction stroke, the trigger
mechanism 62 is released, and the spring 49 biased
against inner shell wall 32a and double piston seal
44, will urge the pi~ton 42 to its retracted position
as shown schematically in Figure 3. ~he valve 60 will
close against its seal 58 and inlet valve 38 will
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open. The product in the container 14 will be ~orced . ;~
up dip tube 2~ into passage 26 and chamber 34 passed
the valve 38 into primary pump chamber 40. During the
retraction of the piston 42, product in the
supplemental pump chamber 74 will be forced through
the clearance 80 into lateral passages 18 through bore ~ . :
~o and out through the nozzle 56. Eventually, the .
piston 42 will app~oach its fully retracted position
at which the desired amount of product will be pulled .. ~ :.
into primary pump chamber 40 and the product ~in .;-~ :
supplemental pump chamber 74 vill be discharged. This ..
a fully retracted position is represented by Figure 1 .;
with both val~es 38 and 60 seated and closed and vent
28 closed. The pump 10 is now ready ~or another
pressure stroke.
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~RY 01 ~90 14:46 KRNE/D~LSIMER&ET P.7/19
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Accordingly, the foregoing pump characteristics,
objects and adv~ntages are most e~fectively attained.
Thus a double acting trigger actuated pump is provided
with:
1) higher adjustable pump pre6sure;
2) longer ad~ustable trigger stroke; ~ -
3) greater adjustable pump volume; -
4) a vent that is sealable directly to the
chamber;
5) adjustable trigger leverage;
6) adjustable pump chamber diameter;
1) no pump leakage;
8) pu~p cen~ered on neck of container; znd, -
9) ability to use a shroud over pump if desired.
Thus the several a~orenoted objects and advantages
are most effectively attained. Although a single
60mewhat preferred embodiment has been disclosQd and
described in detail herein, it should be understood
that this invention is in no sense limited thereby and ~;
itQ scope is to he determined by that of the appended ~ '
claims. ~;,' .
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