Note: Descriptions are shown in the official language in which they were submitted.
This invention relates to a hand held apparatus for
applying adhesive over a taped corner joint between
adjacent wallboard sections.
In my copending application entitled Pistol Grip
Apparatus For Applying Tape and Adhesive to Wallboard Joints,
Canadian Application Serial No. 2,053,788-4, filed October
21, 1991, and assigned to the same assignee as the
present application, I disclose a pistol grip apparatus
through which "mud" or adhesive is pumped from a reservoir
and dispensed beneath tape applied by the apparatus to
abutting pieces of wallboard or sheetrock at the juncture
of the wallboard. Because the adhesive or "mud" is pumped
through the device from an exterior reservoir, the device
and apparatus is rendered lightweight: and can be easily
manipulated using one hand on a pistol grip and a second
adjacent the front o~ the gun-like apparatus, for example,
by holding the tube leadin~ to the reservoir which
connects the reservoir to the ~un barrel to aim the `
apparatus along the w~llboard joint. ~.;
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~A corner or creasing roller is also provided for use `~
in conjunction with the apparatus during those times when
a~joint tape is to be placed in a corner, i.e., in a joint
: between wallboard section at right angles to each other.
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The roller is mounted on a yoke which is pivoted to side
plates of the device and creases the tape into a form
where portions extend at right angles to each other while
adhesive or "mud" is being applied beneath the tape by the
apparatus. Once the joint i5 initially set and the
adhesive dries, it is customary to use a post-deposited
adhesive over the tape to smooth the taped joint and ready
it for final finishing, such as by painting or papering.
In order to accomplish this objective, the standard
nozzle described in my copending application can be
quickly removed and replaced by a post-deposit nozzle of
the type shown in FIGURES 13 and 14 of U. S. Patent No.
4,090,914. Such nozzle is mounted in the same manner as
the standard nozzle; however, the shape of the post-
deposit nozzle is completely different and has an innerwall which extends substantially longitudinally of the
tool and then curves around the tape-applying rollers, so
that with the post-deposit nozzle, adhesive is applied
over the joint at a region closely adjacent to the rollers
where tape would normally be applied. However, the "mud"
or adhesive can adhere to the rollers, requiring them to
be cleaned or replaced prior to the next use of the
apparatus in applying tape. Not only does this cause
considerable downtime in use of the apparatus, it can
require expense in replacing parts.
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Accordingly, the present invention relates to a post-
deposit nozzle for applying adhesive to a wallboard corner
joint which can be easily mounted as a substitute for the
entire tape applying head assembly disclosed in conjunction
with a pistol-grip tool in my copending patent application.
This eliminates the requirement for separate maintenance in
cleaning of the head assembly, if it is used in a post-deposit
adhesive applying process to a wallboard corner joint.
According to one aspect of the invention, an apparatus
for supplying adhesive onto a tape-covered wallboard joint
comprises a reservoir chamber adapted to contain adhesive,
pump means to effect progressive expelling of adhesive from
said reservoir chamber for application to a wallboard joint,
an elongated hollow barrel having a chamber in communication
with said pump means, said barrel having a pistol-grip
extending downwardly from said barrel for holding said barrel,
and including a first bracket member, nozzle means having a
dispensing orifice in communication w1th said barrel chamber
to dispense and direct adhesive therefrom to a predetermined
location, and including a second bracket member, one of said
first or second bracket members including at least one
elongated raised portion, wherein the other at said first or
second bracket member is slidably received behind said at
least one elongated raised portlon to detachably mount said
nozzle means to zaid barrel, adhesive spreading means mounted
on said nozzle means and having a frame:member for contact
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with a wallboard corner joint, said frame member being mounted
on said nozzle means in surrounding rela~ion to said
dispensing orifice and having relatively rotatable portions
disposed substantially normal to each other and trigger means
on said barrel for controlling the operation of said pump
means to expel adhesive from said reservoir chamber through
said barrel chamber and orifice in said nozzle means.
According to another aspect of the invention, an
apparatus for supplying adhesive onto a tape-covered wallboard
~oint comprises a barrel member defining a chamber for
receiving adhesive, and including a pistol-grip extending from
the barrel member, and a first bracket member and a nozzle
member coupled in fluid commun1cation with the barrel member
and defining a dispensing orifice for dispensing adhesive and
including a second bracket member, wherein one of said first
bracket member or said second bracket members includes at
least one elongated raised portion for slidably receivin~ the
other of sald first bracket member or said second bracket
member behind the at least one elongated raised portion to
detachably mount the nozzle member to the barrel member.
In the preferred embodiment described herein, a spring-
biased floatlng frame adapted to conform to the exact
configuration of the corner joint is mounted on a post-deposit
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adhesive nozzle member which can~be secured by a bracket to a ~
pistol-grlp barrel through which the adhesive is adapted to be ~-
pumped from a reservoir, through the nozzle, and onto the
taped corner joint. The support for the frame comprises a
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pair of blocks disposed at a right angle to each other having
a central opening and socket for receiving a ball on the end
of the nozzle. The ball and socket permit universal rotation
of the support members relative to the nozzle. ~ frame
comprising a pair of three-sided members circumscribe the
support blocks and form a window for each of the supports.
The three-sided frames are povitably mounted to the support
blocks alon~ a common juncture, but each can move relative
to and independent of the support blocks and relative
to each other against the bias of one or more leaf springs
mounted on the support blocks so-that as adhesive is applied
through the nozzle the adhesive is spread evenly along the
corner joint by the frame members mounted about each of
the support blocks through which the adhesive or "mud" is
dispensed by the nozzle to the corner joint. The "floating"
nature of the frame members enables them to closely follow the
contour of the corner joint as the adhesive is dispensed.
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Further objects and advantages of the invention will
become more apparent from the following description and
claims and from the accompanyiny drawings, wherein~
FIGURE 1 is a perspective view of the pistol-grip
apparatus comprising the subject of the present invention;
FIGURE 2 is a partial perspective view of the front
portion of the pistol-grip housing or barrel of the
apparatus of FIGURE 1 provided with a bracket for
receiving the "mud" or post-dispensing nozzle portion of
the apparatus;
FIGURE 3 is a partial perspective view of the rear
portion nf the "mud" post-dispensing nozzle of the
apparatus of FIGURE 1;
FIGURE 4 is an exploded perspective view of the post-
deposit nozzle portion of the present invention;
FIGURE 5 is a longitudinal cross-sectional view
through the post deposit nozzle of FIGURE 4;
FIGURE 6 is a side view in elevation of the "mud" or
adhesive spreading frame of the nozzle of FIGURE 4 as seen
from the left-hand side of FIGURE 4;
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FIGURE 7 is a bottom plan view of thP cement or
adhesive-spreading portion of the nozzle illustrated in
FIGURE 6;
FIGURE 8 is a top plan view of the adhesive or
cement-spreading portion of the nozzle illustrated in
FIGURE 6; and
FIGURE 9 is a view similar to FIGURE 8 but
illustrating movement of the frame members of the
spreading portion of the nozzle to conform ko the
configuration o~ the wallboard corner joint to which post-
adhesive is dispensed through the nozzle.
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Referring now to the drawings in de~ail, wherein like
numerals indicate like elements throughout the several
views, FIGURE 1 illustrates an apparatus 10 provided with
a hollow barrel 12 terminating in a downwardly extending
pistol grip 14. The barrel 12 includes a hollow chamber
16 (see FIG. 5). The pistol grip 14 and barrel 12 of the
apparatus 10 may be formed from a lightwei~ht metal such
as aluminum.
Chamber 16 is adapted to receive "mud" or cement
adhesive used to adhere wallboard tape to a joint between
ad~acent wallboard panels or to apply as a post-deposit
over tape at a corner joint between adjacent wallboard
panels. Chamber 16 includes a downwardly extending
reduced diameter portion 22 which is received in
frictional seated engagement in the inner diameter of a
rubber hose 24. Hose 24 may be connected to a pump sea~ed
on or in a reservoir o the "mud" ~not shown) t which pump
is driven by an electric motor. The pump will pump the
adhesive or "mud" through the hose 24, tubular ~xtension
22 o chamber 16, and into the chamber 16, until the
chamber is filled.
A downwardly extending trigger 26 is slidable in a
horizontal slot~or opening 29 ~ormed in barrel 12 along
the bottom of barrel 12. As described in detail in my
copending application, entitled 'iPistol Grip Apparatus for
Applying Tape and Adhesive to Wallboard Joints", U.S.
Serial No. 07/675,332, filed March 26, 1991, the trigger
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is connected at its forward end by a rod to a valve
mechanism generally indicated by the numeral 30 disposed
within chamber 16 which opens and closes an opening 32 in
the forward wall 34 of chamber 16 so that the "mud" or
adhesive can be dispensed throuyh opening 32 to the
interior 38 of a "mud" dispensing nozzle generally
designated by the numeral 36 of apparatus 10. The nozzle
36 includes a tapering circular chamber 38 in
communication with chamber 16 through opening 32 and a
concentric, contiguous opening 40 formed in the rear wall
39 placed in abutment to wall 34 of chamber 16 in barrel
12. Upon opening of the valve mechanism 30, the "mud" or
cement will flow from chamber 16 through opening 32,
contiguous opening 40 into chamber 38 and then through a
dispensing orifice 50 having a contiguous passageway 42
between the forward end of chamber 38 and opening 50.
opening 50 i5 formed in the forward end of a ball 52 whose
interior is in communication with passageway 42. Ball 52
is universally rotatable in a socket 54 formed in a pair
of support blocks 56,58 disposed substantially normal to
each other and forming a portion o~ a "mud" or cement
spreader generally indicated by numeral 600
Nozzle 36 is attachad to barrel 12 by a bracket
arrangement shown in FIGURES 2 and 3.
~ounted on wall 34 of barrel 12 is a substantially
U-shaped bracket 86 in plan elevation. Bracket 86
includes a pair of legs 88,90 ~paced from front wall 34 of
barrel 12 by legs 92 and 94, respectively. A bight
portion 96 of bracket 86 joirls legs 88,90. Extending
outwardly from bight 96 i6 a threaded tud 98~ :~
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The rear wall 39 of chamber 38 of nozzle 36 has an
integral plate 100 provided with laterally extending ears
102 adapted to be received behind legs 88,90 of bracket 86
in abutment with wall 34. Downwardly extending tabs
104,106 on rear wall 39 surround stud 98 and a nut 108
loaks the plate 100 to brack~t 86 with opening 40 in line
with nut 66 on valve assembly 30.
This connection permits other tools to be mounted on
the barrel 12, which do not form a part of the present
invention, as for example, a tool to apply "mud" or
adhesive over a wallboard joint beneath tape along with
means to advance the tape.
The spreader 60 includes a spring-biased floating
frame 62 adapted to conform to the exact configuration or
contour of the corner joint mounted on post-deposit
adhesive nozzle member 36 which is secured by brackets
86,100 to the pistol-grip barrel 12, as the tool is moved
along the corner joint to dispense adhesive.
The support for the frame 62 comprises blocks 56,5
disposed at a right angle to each other having central
opening 64 adapted to be aligned with opening 50 in the
end of ball 52 on the end of the no~zle 36. The ball 52
is received in socket 54 formed in support blocks 56,58
and the ball and~socket permit universal~rotation of the
support member relative to the nozzle 36. A wire spring
66 is looped back on itself and seated behind the ball 52
(as shown in ~IG. 5) in oppossd grooves 68 formed in wall
extensions of each block 56, 58 to hold the ball 52 in
~ocket 54. The frame 62 comprises a pair of tlree-sided
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members 69,70 which circumscribe each of the support
blocks 56,58 and form a window 71 ~or each of the support
blocks 56~58O
The three-sided frames 69,70 are pivotably mounted
for limited movement relative to each other towards and
away from abutting surfaces 72,73 on the top and bottom
edges of support blocks 56,58 along a common juncture
defined by an elongated clip 74 having side edges seated
in parallel grooves 75 in support blocks 56,58 and cut
away intermediate its ends to expose opening 50 in ball
52. As a consequence, the frame members 69,70 can move
relative to and independent of ~he support blocks 56,58
and relative to each other against the bias of a pair of
one-piece leaf springs 76 mounted on the support blocks in
contact with the exterior of vertically adjustable
mounting clips 77 slidable up and down on fixed screws 78
on support blocks 56,58, respectively, and the interior o~
clips 77 against a portion of each frame 69,70, so that as
adhesive i9 applied throu~h the nozzle opening 50, the
adhesive is spread evenly along the corner joint by
j contact with the individual frame members 69,70 mounted
about each of the support blocks 56,58 which "float"; due - :
to the bias exerted by springs 76, between an abutment
position of surfaces 72,73 (e.y., FIG. 9) to a~position
where tha surfaces:are separated (e.g. FIG. 8) to follow
the contour of the corner joint de~ined by adjacent ~ .
wallboard panels; rotation of the ~rame:member in other
than intersecting vertical planes~also:being enhanced:by
the ball and socket connection of the support blocks 56,58
to the nozzle member 36. L-shaped brackets 79 overlying
the vertical portion of each ~rame 69,70 and attached to
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one of the blocks 56,58 by screws 80 further proscribe
movement of the ~rames 69,70 relative to the support
blocks 56,58 and prevent disassociation of the frames from
the blocks under the bias of leaf springs 76. A cover 81
is threadedly connected to the bottom (top) of the support
blocks 56,58 to complete the construction.
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