U.S. patent number 3,910,466 [Application Number 05/432,050] was granted by the patent office on 1975-10-07 for air actuated plastic compound dispensing device.
This patent grant is currently assigned to Roean Industries. Invention is credited to Roland W. Collar.
United States Patent |
3,910,466 |
Collar |
October 7, 1975 |
Air actuated plastic compound dispensing device
Abstract
An air actuated plastic compound dispensing gun comprised of
detachable cylindrical housing and interlocking body member. The
housing has two open ends, the forward one of which is
circumferentially inwardly flanged. The body member may have one
open end and one closed end, the open end of the member being
provided with interlocking engagement means to receive and secure
therein the cylindrical housing. A cylindrical disposable type
plastic filled cartridge is placed in the housing with its forward
end protruding through the flanged end of the housing. The
cartridge has a forward end dispensing nozzle and a rear end inner
wall which wall, with the closed end of the body member, defines a
chamber. The body member may be axially orificed through the rear
closed end to such chamber, and transversely orificed into said
axial orifice. The transverse orifice is connected by means of an
adaptive inlet element, to a detachable flexible base supplying
pressurized air from an outside source. Disposed in the axial
orifice may be a plunger type valve urged to a first rearward
position, in which the valve is held open to exhaust to the
atmosphere any air pressure in the chamber. When the plunger type
valve is pressed forward into said chamber to a second position,
the exhaust passage is thereby closed and the pressurized air is
conducted to the chamber. Thereupon the pressurized air forces the
after end cartridge wall constituting a piston, down the cartridge
barrel to extrude the viscous material from the opposite nozzle
end.
Inventors: |
Collar; Roland W. (Sun Valley,
CA) |
Assignee: |
Roean Industries (Pacoima,
CA)
|
Family
ID: |
23714544 |
Appl.
No.: |
05/432,050 |
Filed: |
January 9, 1974 |
Current U.S.
Class: |
222/327;
137/625.48; 222/334; 137/625.68 |
Current CPC
Class: |
B05C
17/015 (20130101); Y10T 137/86702 (20150401); Y10T
137/86879 (20150401) |
Current International
Class: |
B05C
17/005 (20060101); B05C 17/015 (20060101); B67D
005/46 () |
Field of
Search: |
;222/389,327,258,261,262,396,397,386.5,325,326,334
;137/625.68,625.67,625.48 ;85/8.8 ;251/325 ;184/39,40,41,42 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Reeves; Robert B.
Assistant Examiner: Rolla; Joseph J.
Attorney, Agent or Firm: Pavitt, Jr.; William H.
Claims
Having described the invention, what is claimed is:
1. An air actuated device for dispensing a viscous material
contained in a disposable cartridge in the form of a
cylindrical-walled barrel having a nozzle outlet at one end of the
barrel and a piston closure at the other end of the barrel, said
device comprising:
A. a cylindrical housing dimensioned to receive in a close fit and
to retain said cartridge, said housing being partially closed but
orificed centrally at one end to permit the cartridge nozzle to
extend through said orifice, and the other end of said housing
being open and provided with interlocking means;
B. a receptacle body member for receiving and securing the said
other end of said housing therein, said receptacle body member
having (i) a cylindrical socket cavity with an open end and a
closed end, to receive the said other end of said housing after one
of said cartridges has been inserted in said housing, and (ii)
means cooperating with said interlocking means to removably secure
said housing end in said socket cavity and in abutment witht the
portion of the body member defining said cavity, an orifice in said
receptacle body member, said orifice extending axially therethrough
from the socket cavity to communicate with a counterbore extending
coaxially from the after end of said socket, and said receptacle
body member being transversely orificed from said axial orifice to
a point outside said receptacle body member to provide an air inlet
passage connectable to a source of air under pressure; and
C. a plunger type valve, said valve being slidably disposed in said
axial orifice and counterbore and extending from said socket cavity
to a point beyond the after end of said body member, said valve
being axially orificed from its socket cavity end to a point on
said valve in said counterbore, and a transverse bore in said valve
at the last said point, and said valve further having a pair of
axial extents spaced from each other and fitting closely in said
orifice, and an intermediate axial extent between said pair of
axial extents of lesser diameter than that of said orifice to
constitute an annulus in said plunger valve, and said valve being
provided with means at its end extending into the socket cavity to
prevent said end from being drawn into said axial orifice, said
valve being slidable in said axial orifice from a first position
into which said valve is biased, wherein said air under pressure
entering said body member through said transverse orifice is
confined to said annulus and is thereby prevented from developing a
pressure force in said socket cavity through said axial orifice,
and said socket cavity is vented through the axial orifice in said
valve to the atmosphere in said counterbore at the rear of said
body member, to a second position, accomplished by being pushed
manually forwardly into said body member from the rear thereof,
wherein said annulus is placed in communication with both said
socket and said air inlet passage and venting through said axial
valve orifice is prevented by shifting the transversely bored valve
area inwardly from said counterbore into said axial orifice,
thereby, while said venting is thus prevented, the air under
pressure is directed into said socket behind said cartridge piston
to build up pressure in said socket, to force the said piston down
the cartridge barrel within said cylindrical housing to extrude the
viscous material through the cartridge nozzle.
2. An air actuated device for dispensing a viscous material
contained in a disposable cartridge in the form of a
cylindrical-walled barrel having a nozzle outlet at one end of the
barrel and a piston closure at the other end of the barrel, said
device comprising:
A. a cylindrical housing dimensioned to receive in a close fit and
to retain said cartridge, said housing being partially closed but
orificed centrally at one end to permit the cartridge nozzle to
extend through said orifice, and the other end of said housing
being open and provided with interlocking means;
B. a receptacle body member for receiving and securing the said
other end of said housing therein, said receptacle body member
having (i) a cylindrical socket cavity with an open end and a
closed end, to receive the said other end of said housing after one
of said cartridges has been inserted in said housing, and (ii)
means cooperating with said interlocking means to removably secure
said housing end in said socket cavity and in abutment with the
portion of the body member defining said cavity, an orifice in said
receptacle body member, said orifice extending axially therethrough
from the socket cavity to communicate with a counterbore extending
coaxially from the after end of said socket, and said receptacle
body member being transversely orificed from said axial orifice to
a point outside said receptacle body member to provide an air inlet
passage connectable to a source of air under pressure; and
C. a plunger type valve, said valve being slidably disposed in said
axial orifice and counterbore and extending from said socket cavity
to a point beyond the after end of said body member, and said valve
having a sufficiently lesser diameter than that of said orifice to
provide an annular passage between the wall defining said orifice
and said valve, said passage communicating at all times with the
socket cavity, said valve being provided with means at its end
extending into the socket cavity to prevent said end from being
drawn into said axial orifice, and with means at its outer end when
said valve end is pushed into the counterbore to shut off
communication between said annular passage and the atmosphere
through said counterbore, said valve being slidable in said axial
orifice from a first position into which said valve is biased by
the air under pressure arriving in said annular passage through
said transverse orifice, wherein said air under pressure entering
said annular passage is vented through said counterbore and hence
cannot build up pressure in said socket cavity; to a second
position forwardly of said first position accomplished by being
manually pushed into said body member from the rear thereof against
the air pressure bias wherein the annular passage is closed off
venting to the atmosphere through the counterbore, so that the air
under pressure is directed into and confined within said socket
cavity behind said cartridge piston to build up pressure in said
socket cavity, thereby forcing the said piston down the cartridge
barrel within said cylindrical housing to extrude the viscous
material through the cartridge nozzle.
3. The device as described in claim 2 wherein the forward end of
the plunger valve is bifurcated and provided with retaining
elements of such dimensions as to, when pressed radially inwardly,
enable said elements to pass through said axial orifice; but after
passing through the axial orifice and entering the socket cavity,
said elements expand and prevent the valve plunger from being blown
out of the axial orifice by air pressure.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to devices for dispensing a viscous
material, such as a caulking compound, from a cylindrical
disposable cartridge, where said cartridge is closed at its after
end by a piston-like wall. The invention also pertains to valve
means to control the application and exhaust of a pressurized fluid
which is introduced into a device of this type.
2. Description of the Prior Art
For many years various forms of plastic material dispensing devices
have been manufactured and sold for both industrial and commercial
use. A common device heretofore used to dispense viscous materials
from disposable cylindrical type cartridges has been a gun-like
structure with handle and receptacle into which is fitted and
interlocked a detachable cylindrical barrel-shaped cartridge
housing unit. Such devices have usually been fabricated of metal
alloys and included a number of intricate and detailed interrelated
machined composite parts.
In more recent years, however, dispensing devices of the type
referred to have been fabricated of plastics having fewer movable
or interrelated parts, thus providing expediency in manufacturing
techniques and inexpensive replacement of parts. Further, the use
of pastic materials has facilitated the improvement of valve
mechanisms designed to control the feed and flow rates of viscous
materials from the nozzle end of the cartridge, thereby precluding
waste of such materials, particularly where such waste has resulted
from pressure overloads or inaccurate pressure control mechanisms.
In the latter devices, the valve means have been designed to be
pressure controlled by spring tension means disposed to
automatically open or exhaust when the applied pressure exceeded a
predetermined value in pounds per square inch (p.s.i.), said
precalculated spring tension means thereby preventing overloading
of the pressurizable chamber so that only minimal waste of the
viscous material would occur.
While prior art methods have proven both feasible and acceptable
for industrial and commercial use, the various configurations and
designs of prior art control means to regulate pressure have
presented several problems.
In the first place, if the valve mechanism is fabricated from metal
alloys as a component of a metallic housing unit, the tolerances
for interconnectable and interelated parts are stringent, thereby
resulting in expensive and tedious machining operations; also, the
use of metallic valve systems coupled with other metallic component
members of the device results in a cumbersome and heavy unit which
becomes awkward to use and fatiguing for the operator, and
especially where operations necessitate overhead use of the device.
A further problem associated with metal alloys is the necessity of
maintaining and cleaning the metallic components to preclude
corrosion and "freezing" of movable metal parts thereby resulting
in inoperability of the device. Replacement of intricate machined
metal components or valve systems is also expensive.
Secondly, although the use of plastic fabricated housing, adapters
and valving means for pressurized dispensing of viscous materials
from disposable cartridges has alleviated some of the aforesaid
expense and corrosion related problems, certain other associated
problems have not heretofore been eliminated. The present state of
the art relative to plastic fabricated components for dispensing
devices, including valving means for pressure control, has been
such that the valving means comprise elaborate and intricate design
configurations which must be operably retained in an interconnected
relationship and disposed in a reciprocal movable position in
conjunction with a pressurizable chamber. The design configurations
have encompassed varying degrees of bevels, flanges, valve stems,
valve seats, springs of precalculated resistance forces, all of
which have had to be intricately fabricated and then assembled into
a unitary functioning component by bonding, threaded engagement
means or the like. This valve complexity has required a high degree
of skill and know-how properly to assemble and service the devices,
and has made even the plastic devices unusually costly to fabricate
and sell.
In addition, where low viscosity materials require only minimal
p.s.i. forces for dispensing purposes, the use of inexpensive
diaphragm type compressors has heretofore been untenable. Stalling
of this type compressor has been a persistent commonplace problem
due to inadequate exhaust means or capable by-pass mechanisms in
the valving system to prevent pressure buildup. The precalculated
tension actuated means for modulated exhaustion has not been
effectively or adequately controllable in the low p.s.i. ranges to
preclude the stalling of diaphragm type compressors.
Finally, the design features inherent in prior art valving systems
which have been directed to regulating and controlling the air
pressure have resulted in excessive costs in replacing
malfunctioning, defective or fatigued valve systems and valve
housing mechanisms.
SUMMARY OF THE INVENTION
The present invention avoids the above described disadvantages of
prior art dispensing devices and valve systems for dispensing
viscous materials from disposable cartridges by being so
constructed that atmospheric exhaustion of air pressure is
continuous until required for application to the rear wall of the
piston-like cartridge. Moreover, the pressure may be controlled to
effect dispensing without the aid of precalculated tension means
for modulated atmospheric exhaustion of fluid pressure. Further,
fabrication of the improved valve system is less intricate and less
expensive than prior art designs or configurations.
In one embodiment of the invention, a body member is provided with
an axially oriented plunger type valve which is biased to a first
position by fluid pressure, wherein said valve circumferentially
continuously exhausts to the atmosphere a transversely entering
pressurized fluid stream (such as air or other gas), and upon
depression of said plunger type valve from the rear of the adapter
member, the valve is shifted from its said first position by
sliding forward in its axial orifice through the body member to a
second position wherein the circumferential atmospheric exhaust
path is closed and the pressure fluid stream is diverted to and
against the rear wall of the disposable cartridge held adjacent the
adapter by the cartridge housing barrel. Thereupon, the said inner
cartridge wall is forced by the pressurized fluid as a piston down
the cylindrical cartridge to extrude the plastic material in the
cartridge from the nozzled outer end of the cartridge. Release of
the valve plunger results in its return by the pressure fluid to
the first position of the valve where atmospheric exhausting again
occurs.
In a second embodiment of the invention, the body member is also
provided with an axially oriented plunger type valve spring-biased
into a first position. However, in this embodiment, in the first
valve position the stream of pressure fluid is not exhausted
through the valving mechanism to the atmosphere, although the
chamber behind the rear cartridge wall is placed in continuous
communication with the atmosphere. Upon pushing the plunger type
valve from the rear of the body member, the valve is caused to
slide forward in the axial orifice of the body member to a second
position wherein the axial passage between the said chamber and the
atmosphere is closed; and simultaneously the pressure fluid is
directed circumferentially about the valve into said chamber where
it exerts force against the rear wall of the disposable cartridge,
thereby to drive said inner wall in a piston-like manner down said
cartridge barrel to extrude the plastic material in the cartridge
from the nozzled outer end of the cartridge. Releasing the valve
plunger causes immediate return of the valve to its first position
through the spring bias, thereby simultaneously shutting off the
flow of pressure fluid to the chamber and placing the latter in
communication with the atmosphere.
By so providing such improved and simple valving systems, which may
be expeditiously fabricated and readily utilized with the body
member and disposable cartridge housing members, an inexpensive
totally plastic dispensing device may be fabricated at a very low
cost. Because of the simple design and the low cost of replacing
component parts, it is unnecessary for users of the device to take
great care of the device.
Further, in dispensing with prior art valving mechanisms, not only
is the cost reduced, but use of the valving mechanisms of the
present invention facilitates ease of handling and operability; and
finally, malfunctioning of the valving mechanism is minimal due to
the simplicity of construction and fabricateion from plastic
polymers.
In a number of important respects, therefore, the present invention
overcomes the problems inherent in prior art valving
mechanisms.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of one embodiment of the present
invention.
FIG. 2 is an enlarged section, taken on the line 2--2 of FIG. 1
with the valve means shown in one of the two positions.
FIG. 3 is a partial section similar to FIG. 2 but with the valve
means shown in the other of its two positions.
FIG. 4 is a cross-section taken on lines 4--4 of FIG. 2.
FIG. 5 is a perspective view of a second embodiment of the present
invention.
FIG. 6 is an enlarged section taken on the line 6--6 of FIG. 5 with
the valve means shown in its closed position.
FIG. 7 is a partial section similar to FIG. 6 but with valve means
shown in open position.
FIG. 8 is a perspective view of the Button-Valve shown cross
sectionally in FIGS. 6 and 7.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1 of the drawings, a fluid actuated gun type
dispensing device constructed in accordance with the present
invention may be comprised of a body member 10 into which may be
interlockingly inserted a cylindrical adapter housing 12 which is
orificed at 14 in its opposite end 16 and receives and holds a
disposable plastic filled cartridge 18 therein. Such a cartridge
comprises a cylindrical shell 18a which is nozzled at 18b at one
end 18c and is provided with a piston-type closure 18d at its
opposite end 18e. When the cartridge 18 is thus inserted in the
adapter housing 12 and the latter interlocked into the body member
10 against a sealing ring 13, a chamber 15 will be found to be
defined by the walls of the piston closure 18d and the inner
transverse wall 10a of the body member 10.
The body member 10 includes an integrally formed handle 20 which is
orificed at 22 to provide an air inlet passage as shown in FIGS. 2
and 3. The outer end 24 of this orifice may be threaded at 26 to
provide for screwing on a base fitting 28 (FIGS. 1 and 2). The base
fitting is provided with adaptive means 30 for attachment to a
flexible hose 32 (FIG. 1) which supplies pressurized air from a
compressor or other outside source (not shown).
The body member 10 is axially orificed at 34 slidably to receive a
plunger-type valve 36. The orifice 34 is counterbored at 38, a
predetermined distance, to allow a coiled spring element 40 to be
seated on the shoulder 42 where the orifice 34 and counterbore 38
join. The valve 36 may be circumferentially grooved at 44 to
receive and hold therein a retaining ring 46 at the forward end 36a
of said valve 36. The valving means 36 may be further
circumferentially grooved at 48, 48a and 48b to receive
respectively sealing O-rings 50, 52 and 54. A further
circumferential recess 55 is provided about the valve member 36 and
an axial bore 56 extends between the end 36a and diametric passage
58 disposed toward the rear of the valve 36.
As shown in FIGS. 2 and 4, when the valving mechanism is in its
first or unactuated position, the chamber 15 is placed in
communication with the atmosphere through the bore 56, passage 58
and counterbore 38. The plunger valve 36 is normally disposed in
such first position in FIG. 2 because the spring biased means 40
seated on the shoulder 42 forces the plunger in a rearward position
relative to the body member 10. In this rearward position the
retaining ring 46 is held against the rear inner wall 10a of the
body member 10. In such rearward position, the pressurized fluid
which enters through the handle orifice 22 is prevented from
passing beyond the circumferential groove 55 about the valve member
36.
Upon pushing the plunger-type valve 36 forward to a second position
as shown in FIG. 3, the retaining ring 46 is moved away from the
inner rear wall 10a. In this second position, the axially bored
valve orifice 56 and the transversely bored valve passage 56 are
closed, precluding atmospheric exhaustion or bleeding of the
pressurized air from the chamber 15. Simultaneously the groove 55
is shifted to where one end 55a is opened to the chamber 15, while
the other end 55b is open to the small orifice 22a connected to the
orificed handle passage 22. The circumferentially ringing sealing
elements 52 and 54 prevent escape of air to the atmosphere while
the plunger valve 36 is held in this second position.
A similar valving arrangement, as shown in FIGS. 5-8, may be
provided for use with small diaphragm type compressors utilized as
an air supply source and especially where low viscosity materials
are to be dispensed. In this embodiment a unitary thumb button-type
valve 70 may be provided. The valve 70 may be slidably disposed in
an axial orifice 72 in a cup-shaped body member 74. The body member
74 may be provided with threaded engagement means 76 to receive and
hold therein a cylindrical retainer housing 77 within which is
contained a plastic-filled disposable cartridge 76a having a
movable rear piston wall 78 similar to what has been described
above in connection with the FIGS. 1-4 embodiment of the present
invention and is well known in the art.
The axial orifice 72 of the body member 74 is counterbored at 80.
Further, the body member 74 is transversely bored at 88, and
counterbored at 88a and may be threaded at 89 a sufficient distance
to receive in said counterbore 88a a base fitting 84 which may be
screwed therein, and is connectable by a hose 86, to a pressurized
air source, such as a diaphragm type compressor (not shown).
The configuration of the valve member 70 is such that its diameter,
for the axial distance x-y, enables it to be loosely slidable with
a small amount of clearance within the wall-defining the orifice
72; and toward the rear end of such member 70 for the distance
x'-y', the diameter thereof is increased to where such portion
slides closely within the counterbore 80. The member 70 may be
further circumferentially grooved at 91 to receive an O-ring 81.
The forward end 70a of the valve member may be slotted at 70b for a
predetermined distance D-E for two purposes: first, by slotting the
end 70a, the end may be provided with an enlargement in the form of
an opposed pair of co-planar semicircular terminal plates 82 and
82a which, after they are first pressed together and passed through
the orifice 72, snap apart to prevent the member 70 from being
blown back out of the orifice 72 when air under pressure is
admitted through the passage 88; and secondly, the slotting 70b
places the chamber 15 in continuous communication with the space
surrounding the axial section x-y of the valve member 70, into
which space the pressure air is admitted through the passage
88.
It will be noted that, in the FIGS. 5 - 8 embodiment of the
invention, no spring is provided to bias the button valve 70
rearwardly. Because of the valve arrangement selected, no bias is
required. As soon as air under pressure is admitted through the
passage 88 or is retained in the chamber 15, the valve body 70 is
subjected to a continuous force pushing it to the rear so that the
pressure air may be exhausted to the atmosphere through the
clearance space surrounding the x-y portion of the valve body 70
and the counterbore 80. The member 70 is thus maintained in its
first rearwardly disposed position so long as air pressure is
present in the bore 72. This first position continuously bleeds the
transversely entering pressurized air so that when a small
diaphragm type compressor is used, the compressor may be started
without stalling the motor. It is only when such air pressure force
is overcome by a greater force being applied by an operator's thumb
to the rear of the button valve 70 that the passage through such
clearances and the counterbore 80 is closed by the O-ring 81 being
pressed against the shoulder 70' between the bore 72 and
counterbore 80. At this point, the pressure air is diverted
exclusively into the chamber 15', thereby to force the piston 78
down the cartridge barrel 76a to extrude the cartridge contents out
of the nozzle 86.
The embodiments of the invention as shown in FIGS. 1 through 8 are
particularly advantageous in that the above described valving means
may be fabricated and assembled more easily, and hence much more
inexpensively than prior art means. Exhaustion of fluid pressure is
immediate, actuation and dispensing is precise and accurately
controllable without exotic precalculated physical characteristics
and compared to prior art valving means, the embodiments disclosed
herein are inexpensive to manufacture, maintain and replace.
The invention is not limited to the embodiments described above,
but all changes and modifications thereof not constituting
departures from the spirit and scope of the invention are intended
to be included.
* * * * *