Dispensing gun for applying a flowable sealant from a tube incorporating a plunger end mounted support with incorporated spring for providing even flow inducing force application

Abstract

An assist assembly incorporated into a dispensing gun supporting an elongated cartridge containing a volume of a flowable material. An internally collapsible seating end of the cartridge is engaged by a rod and forward most plunger of the gun in order to force a flowable material through a forward disposed nozzle of the cartridge. A body contains a compressible spring and is mounted to the plunger so that the body contacts the internally collapsible seating end of the mounted cartridge. Forward advancing of the plunger results in a continuous force application by the spring in order to continuously and evenly dispense through the nozzle the flowable material. A secondary spring is mounted between a forward end of the cartridge from which the nozzle projects and an opposing forward end of the gun for additionally assisting in applying a controlled force discharge of fluid from the cartridge.

I claim: 
     
         1 . A spring assist assembly incorporated into a dispensing gun in which is mounted an elongated cartridge containing a volume of a flowable material, an internally collapsible seating end of the cartridge being engaged by a rod and forward most plunger of the gun in order to force a flowable material through a forward disposed nozzle of the cartridge, said assembly comprising:
 a body containing a compressible spring which is adapted to being mounted to the plunger; and   said body being adapted to contacting the internally collapsible seating end of the mounted cartridge such that forward advancing of the plunger results in a continuous force application by said spring in order to continuously and evenly dispense through the nozzle the flowable material.   
     
     
         2 . The assembly as described in  claim 1 , further comprising a secondary spring adapted to being mounted between a forward end of the cartridge from which the nozzle projects and an opposing forward end of the gun for additionally assisting in applying a controlled force discharge of fluid from the cartridge. 
     
     
         3 . The assembly as described in  claim 1 , said body further comprising any of a cylindrical or drum shape, over an open end of which is received an attachable cap. 
     
     
         4 . The assembly as described in  claim 3 , said body further comprising a base aperture receiving therethrough the rod such that the plunger is adapted to being supported internally within said body, a cap attachable to an open end of said body in order to compress said spring therebetween. 
     
     
         5 . The assembly as described in  claim 4 , said open end of said body further comprising an annular projecting and perimeter extending rim through which a plurality of arcuate slots are defined, said cap having a matching rim including a plurality of engagement tabs for engaging through said slots in a snap fit manner to mount over said body. 
     
     
         6 . The assembly as described in  claim 5 , each of said engagement tabs further comprising an angled end ramp. 
     
     
         7 . The assembly as described in  claim 2 , further comprising a washer adapted to seating over the cartridge nozzle and abutting a forward end of the cartridge, such that said secondary spring is biased between said washer and the forward end of the gun. 
     
     
         8 . The assembly as described in  claim 1 , further comprising a member adapted to being pivotally mounted to an intermediate location of the gun for assisting in de-pressurizing and releasing of said body from the cartridge seating end. 
     
     
         9 . The assembly as described in  claim 8 , further comprising a rigid wire element having a first end extending from said pivotal member and a second end adapted to being connected to a release lever mounted to a rear of the gun and which is inwardly pivotal against a further compressing spring for releasing the rod and plunger. 
     
     
         10 . A dispensing gun mounting a dispensing cartridge from which is forcibly distributed a flowable material, comprising:
 said gun having a trigger advanceable rod and forward most projecting plunger; and   a body surrounding said plunger and arranged in abutting contact with an inner collapsible end of the cartridge, said body introducing an additional bias against the collapsible inner end of the cartridge, upon being initially biased by an exerting force applied by said advancement of said rod and plunger in order to force a flowable material through a forward disposed nozzle of the cartridge.   
     
     
         11 . The dispensing gun as described in  claim 10 , further comprising a compressible spring mounted between a forward inner end of said body and said plunger. 
     
     
         12 . The dispensing gun as described in  claim 10 , further comprising a secondary spring adapted to being mounted between a forward end of the cartridge from which the nozzle projects and an opposing forward end of the gun for additionally assisting in applying a controlled force discharge of fluid from the cartridge. 
     
     
         13 . The dispensing gun as described in  claim 10 , said body further comprising any of a cylindrical or drum shape, over an open end of which is received an attachable cap. 
     
     
         14 . The dispensing gun as described in  claim 13 , said body further comprising a base aperture receiving therethrough said rod such that said plunger is adapted to being supported internally within said body, a cap attachable to an open end of said body in order to compress said spring therebetween. 
     
     
         15 . The dispensing gun as described in  claim 14 , said open end of said body further comprising an annular projecting and perimeter extending rim through which a plurality of arcuate slots are defined, said cap having a matching rim including a plurality of engagement tabs for engaging through said slots in a snap fit manner to mount over said body, each of said engagement tabs further comprising an angled end ramp. 
     
     
         16 . The dispensing gun as described in  claim 11 , further comprising a washer adapted to seating over the cartridge nozzle and abutting a forward end of the cartridge, such that said secondary spring is biased between said washer and said forward end of said gun. 
     
     
         17 . The dispensing gunas described in  claim 1 , further comprising a member adapted to being pivotally mounted to an intermediate location of the gun for assisting in de-pressurizing and releasing of said body from the cartridge seating end. 
     
     
         18 . The dispensing gun as described in  claim 17 , further comprising a rigid wire element having a first end extending from said pivotal member and a second end adapted to being connected to a release lever mounted to a rear of said gun and which is inwardly pivotal against a further compressing spring for releasing said rod and plunger. 
     
     
         19 . The dispensing gun as described in  claim 10 , further comprising a superstructure having a first side located recess configuration within which is mounted a forwardly facing cutter blade, an opposite side incorporating at least one pencil insert sharpening port communicable with an additional and associated blade sharpener.