US 2367347 A
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F. C. GOOD CALKING GUN AD OPERATING MECHANISM THEREFOR Original Filed Feb. 3, 1942 llllllll I;
.-HIII Patented Jan. 16, 1945 cALKING GUN ANDOPERATING MECHANISM THEREFOR Frederick C. Good, PhiIa'delphia,Pa., assigner to Pecora Paint Company, Philadelphia, Pa.
Original application February 3, 1942, Serial No. 429,363. Divided land this application February 10, 1943, SerialNo. 475,327
claims. (c1. Vlr-169) The presentinvention generally relates to dispensing devices and, more particularly, to hand operated pressure guns especially intended to dispense calking or similar material, this application being a division of mycopending application Y Serial Number 429,363, filed February 3', 1942.
l. rI rhe invention especially contemplates the provision of a pressure gun of the type specied hav mg a simplified yet rugged' operating mechanism f including a slidable pressure creating member and manually actuated control means associated therewith and operable to impart a positive .thrust to said member for progressively advanc- A mg the same, thus creatingwpressure Within the gun for the extrusion of the calking material; to rigidly hold the pressure creating member in advance position, thereby maintaining the pressure created within the gun by the progressive advancing movement of said member; and to irelease the pressure creating member for relieving the pressure within the gun and permitting manual sliding of said member to retract it in active position.
Another meritorious feature of the invention resides in the provision of a calking gun or like dispensing device wherein the operating mechanism consists of relatively few parts` which may .be easily assembled and replaced thus effecting a substantial saving in material and in the cost of production and maintenance.
Other important objects and advantages of the invention will be in part obvious and in part pointed out hereinafter.
In order that the invention and its mode of operation may be more readily understood by those skilled in the art, I have, in the accompanying drawing and in the detailed description based thereupon set out a possible embodiment of the invention. 'l
In this drawing:
Figure 1 is a side elevation partly in section and partly broken away of a modified form of the invention; l
Figure 2 is a fragmentary cross sectional View taken on line 2--2 of. Figure l;`
. Figure 3 is a fragmentary view showing another position of parts of the operating mechanism ,i1- lustrated in Figure 1. y l
Referring more particularly to the drawing wherein like characters of reference will designate corresponding parts throughout, the calking gun shownbyway of example may bestated to comprisel a skeleton 'frame designated in its entircty for clarity and convenience herein by the reference character 2U. AThis frame 2B is adapttion of said housing ed to engage and retain in position a cartridge A containing the material to be discharged. As shown in the drawing, the cartridge A is preferably of cylindrical configuration and has at one endan annular open portion B, and slidably carries at its other end a movable circular cover C which may serve as a piston to force the contents of the cartridge out through said opening B in ythe manner to be described more fully 'hereinafter.
The skeleton frame 20 includes a body portion which may be termed the head or stock. and which may be, and preferably is, constructed of 'sheet metal stamped and bent into a shape vto provide diametrically opposed walls 2| defining a housing 23 from which depends a pistol grip or handle 24. Upon the inner end portion of the housing r23 is mounted a disc 25 provided with a ilange 26 constituting a rigid and xed seat for' that one end of the cylindrical cartridge A carrying the movable cover C. The flanged disc 25 may be advantageously secured to said housing 23 by means of lugs 21 formed with the endporto extend therefrom for passage through -openings formedin said disc and riveted or upset over the inner surface of the latter'as indicated at 28.
Located immediately below the flanged disc 25 and rlxedly secured to the lower inner end portion of the housingA 23 by means of fastening elements, such as rivets 29 or the like, is a rigid bar 30 projecting for a distance beyond said portion of the housing. v At the free extremity of the bar B of the cartridge A,
3i! is mounted a combined nozzle and flange seat '3l adapted to receive the open portion B ofthe cartridge A. The seat 3|has a depending lug or hingemernber 32 whereby said seat may be pivotally 'connected to said'free end of the bar 30 by ineans of a suitable centrally apertured for the passage of lthe extruded material, and carries a nozzle 35 which preferably is removable, whereby different nozzles of various siz'es land shapes may be interchanged. l v
For the purpose of maintaining the pivotal seat 3l in operative position against the open portion there is provided a, lock bar diametrically opposed end pivotally connected, as indicated at 31, to the upper inner end portion ofthe housing 23. The free end-of the lock bar 36 is preferably shaped into ahook 3S adapted to snap over the outer face ofthe seat 3l which, for that purpose, is formed with a slight depression 39 disposed to cooperate 36 disposed. in paralleling pin or rivet 33. This seat is f with said hook for assuring the locking function of the lock bar 36. The lock bar 36 may advantageously be guided into its locking position by means of ears 40 preferably formed with the seat or disc 3|.
Mounted to slide through the housing 23 and through the seat disc 25 is a notched or toothed piston rod 42 carrying a head or plate 43 which engages the flanged cover B within the cartridge A, such associated parts constituting a piston. The rod 42 passes through an opening 44 in the seat disc 25 and is notched to provide teeth 45 which may be angular, and these teeth are engaged by an actuating pawl 46 pivotally mounted at 41 at the end of a trigger 48 which is pivotally mounted, as at 49, in the head of the structure. The pawl 46 may have a single tooth or a plurality of teeth, as indicated. A detent pawl 50 is associated with these parts, being pivoted in the head, as at l, and as the actuating pawl 46 moves the rod 42, the detent will ride over the yteeth of the same, then hold the rod against retractive movement as the actuating pawl returns for fresh engagement with the toothed rod. This action is continued until the contents of the cartridge A are discharged. The pawl 46 and 50 may be maintained in operative position by the engagement of a suitable spring 52 hooked over the pivot pin 46 of the trigger 48.
In a structure of this type, the operating parts4 are subject to wear, and the spring 52 is subject to stress and may, in time, require replacement. Tofacilitate repairs or renewals of parts or replacement of a worn out or broken spring, removable screw bolts may be employed as the ypivots 49' and 5ls such bolts being held in place bynuts 53. In addition, I may provide one or both walls of the head of the structure with aper-r tures 54, such apertures being so disposed as to permit access to the spring 52, for instance, in case renewal is necessary.
Mechanism of this t'ype requires suitable means for holding the pawls out of engagement with the toothed piston rod so that the latter may be returned to permit insertion of a fresh container of calking material or the like, and in the present instance, these means may be as follows:
The trigger is provided with a forwardly projecting spur 55 which may be integral with the wall of the same, and pivotally mounted in the head is a dog 56 held by a spring 51 and anchored 'at 58 in such position that when the trigger returns to normal operative position, as in Figure 1, 'after an actuating movement, the end of the spur f will underlie and engage this dog, the two pawls 46 and 50 then lying with their operative ends in 51. When in the position shown in Figure 3, the detent 56 as well as the actuating p-awl 46 will be held away from the teeth of the rod and the latter may be retracted carrying the head or plate 43 withit and, when freed from the empty oartridge A and while still in such retracted position,
a fresh cartridge may be applied.
- vUpon pulling back the trigger after a fresh container has been positioned in the gun, the spur 55 y of the trigger is carried away from the dog 56 and .j the spring 51 of the latter retracts it into such position as to' lie in the path of, and over, the spur 55 in the further operation of actuating the toothed rod, as indicated in Figure l.
Upon reference to Figure 1, it will be noted that the under side of the rear end of the detent pawl rests upon a portion of the wall of the trigger, indicated at 59,-and that such end has a rounded surface portion disposed toward its pivotal connection. It will also be noted that the rear end of the operating pawl 46 rides upon the top of a cross member 60. When the pivoted dog 56 is placed in the position indicated in Figure 3, the trigger is carried forward under the action of a spring 6| interposed between the same and the pistol grip or handle 24, and this causes the upper end of the trigger to retract and the rear end of the operating pawl will ride up over the end of the cross member 60. At the same time, the wall 56 of the trigger engages the rear end of the detent pawl and moves the forward end of the latter out of engagement with the teeth, as clearly illustrated in Figure 3. In the normal operative position of the parts indicated in Figure l, the rear end of the detent pawl may rest on the cross member 58 to which the spring 5l' is anchored.
The head is preferably provided with ledges 62 and 63 which may be carried by plate sections 64 secured to the side walls 2l of the housing by welding or otherwise, and these ledges form a support for the toothed rod 42 to insure horizontal movement of the same in the operation of the discharging the contents of the cartridge. In lieu of this arrangement, these ledges might be lpressed up from the side Walls 2l `of the housing.
The dog 56 has side wings 65 which underlie and engage the under edges of the side walls 2i and limit its retractive movement under the influence of the spring 5l, as illustrated in Figure 1.
In order to relieve back pressure upon the contained material, the dog 56 may be flipped to the position shown in Figure 3, thereby permitting the trigger to move forward, releasing the dogs and giving full relief to the back pressure exerted by the material being extruded.
From the foregoing description, it will be apparent that simple and efficient means are provided for accomplishing the objects of the inven` tion, and while the elements shown and described are well adapted to serve the purposes f'or which they are intended, it is to be understood that the invention is not limited to the precise construction set forth, but includes within its scope such changes and modifications as may be made within the terms of the appended claims.
What I claim is:
l. In combination with a frame structure having a grip portionand a toothed rod supported by said frame, manually operable means carried by the handle portion for effecting movement of said rod, said means including an operating pawl and a detent pawl in engagement with the rod for the actuation thereof; a lever pivotally mounted in the handle portion, said lever having a grip portion complementary to said rst named grip portion and carrying the operating pawl, said lever being provided with means engageable with the detent pawl; and a dog associated with said lever for releasing same to eifect disengagement and permitting the spread of said grips of said pawls with the rod.
2. In combination with a frame structure having a handle portion and a toothed rod longitudinally movable in, and supported by, said frame, manually operable means carried by the handle portion for effecting movement of said rod,l said means including a detent pawl for the rod; a lever pivotally mounted in the handleA portion; a spur carried by said lever; and a dog associated with said spur to selectively control the extent of movement of the lever, said lever having a wall portion disposed to engage the detent pawl and release it from the toothed rod when said dog is shifted to permit rocking of said lever. 3. In combination with a frame structure having a grip portion, a toothed rod longitudinally movable-in said frame; manually operable means carried by the handle portion and including an operating pawl for eiiecting movement of said rod; a pivotal lever for actuating said operating pawl and having a grip portion; a detent pawl for the rod; a pivoted dog normally limiting the extent of movement of the grip of said lever away normal movement; a toothed rod connected to said piston; an actuating pawl normally positioned for engaging said rod; a detent pawl normally positioned for engaging said rod;' means associated with said actuating pawl, detent pawl, and trigger whereby normal movement of the trigger slides said piston for subjecting the plastic to pressure continuously during maximum movement of the trigger in one direction, and abnormal movement of the trigger disassociates said piston from said detent pawl and actuating from said rst named grip; and operating parts mounted in the handle portion of the frame for moving the pawls by said lever away from the c toothed rod upon movement of the dog from its lever-limiting position.
4. In a plastic calking gun having a handle including a grip, a piston operating mechanism for said piston comprising: a trigger pivoted to said handle and having a grip with a normal movelment and an abnormal movement away from said handle grip; means connecting the trigger tocsaid piston whereby the normal movement of the triggerslides the piston for subjecting the plastic to pressure, and the abnormal movement of the trigger grip away from the handle grip disassociates said piston from said means; and means for normally limiting the movements of said trigger grip away from said handle grip, said last named means being operable to permit an abnormalv ing the plastic to pressure, and the abnormal movement of the trigger disassociates said piston from said means; and a movably mounted dogl `operatively associated with` said ltrigger whereby the normal and abnormal movements of the trigger are selectively controlled.
6. In ay plastic calking gun having a handle and v fa piston, operating mechanism for said piston comprising: a trigger pivoted to said `handle and having a plastic expelling movement and a normal retractile movement and an abnormalretractile movement; a toothedrod connected 'to said piston; an actuating pawl operatively associated with said rod; a detent pawl operatively associated with said rod; means associated with said actuating pawl, detent pawl, and trigger whereby normal movement of the trigger slides said piston' for subjecting the plastic to pressure, and abnormal retractile movement of the trigger disassociates said piston from said detent'pawl and actuating pawl; and means for selectively controlling; the normal and abnormal retractile movements ofsaid trigger. y
7. In a plastic calking gun `having a handle and a piston, 1 operating mechanism for saidr piston comprising: al trigger pivoted to saidhandle and adapted to have a normal movement and an abpawl; anda m-ovably mounted dog operatively associated with said trigger whereby the normal and abnormal movements ofthe'trigger areselectively'controlled.
8. In a plastic calking gun having a handle and a piston, operating mechanism for said piston comprising: a trigger pivoted to said handle and adapted to have a normal movement of a predetermined extent and an abnormal movevment ofan extent greater than the extent of the normal movement; and means operatively asso-y ciated with said piston and operatively associated with a `portion of said handle and a portion of said trigger whereby the normal movement of the trigger slides the piston for subjecting the` lplastic to pressure continuously during maximum movement of the trigger in one direction, and the abnormal movement of the trigger disassociates said piston from said means.
n 9. In a plastic calkinggun having a handle and a piston, operating mechanism for said piston comprising: a trigger pivoted to said handle and adapted to have a normal movement of a predeate said actuating pawl from said rod, said trigf ger adapted, when abnormally moved, to operatively move said actuating pawl into engagement with said element-and said trigger having a part stationary with respect to said trigger and engaging said detent pawl to disassociate the detent paWl from said rod.
10. In a plastic calkingvgun having akhandlev and a piston, operating mechanism forsaid piston comprising: a trigger pivoted to said handle and adapted to have a normal piston ,operating normal and abnormal'movements thereof, said trigger adapted in its normal movement to actuate said actuating pawlfor the movement of said rod, and in its abnormal ymovement to disengage the detent pawl from the rod and engage said element with said actuating pawl to disengage the same from said rod.
FREDERICK C. GOOD.