Patent Publication Number: US-2011056994-A1

Title: Glue Gun

Description:
FIELD OF THE INVENTION 
     The present invention involves a surface ejector device, especially involves a glue gun. 
     BACKGROUND OF THE INVENTION 
     A conventional handheld glue gun, such as a glue gun that is formed by the glue gun feeding device disclosed in the Chinese patent No. 00257653.8 being combined with a structure capable of containing the cartridge, comprises a main body; the main body forms two paratactic hollowed-out parts, the first hollowed-out part and the second hollowed-out part; the two hollowed-out parts are separately provided with a deflector rod and a brake rod; one spring is located between the deflector rod and the main body, and another spring is located between the brake rod and the main body; a movable rod connecting the deflector rod and the brake rod is located between the two hollowed-out parts, the structure of which is set as that its length can just fit a bolt to make the deflector rod be perpendicular to a push rod when the movable rod is pressed against the brake rod. 
     However, the glue gun feeding device of the above mentioned structure requires the dimension and shape of the components to be very precise, so as to get comparatively good effect of glue dispensing. 
     Moreover, Chinese patent No. 03240344.5 also disclosed a feeding device of a glue gun, which comprises a first section and a second section; the first section is provided with a coupling and a drive sheet, and the second section is provided with a linkage plate; a movable lever is connected to the coupling via the linkage plate, so as to control the rotating of the coupling in the first section to push a push rod. However, the structure of the feeding device is very complicated, so it will bring great inconvenience to the production and manufacture. 
     SUMMARY OF THE INVENTION 
     According to the above mentioned disadvantages of the conventional art, the present invention provides a glue gun with simple structure and good effect. 
     To solve the above mentioned technical problems, the present invention provides the following technical solution that: 
     a glue gun includes a feeding device and a container containing the cartridge, wherein the feeding device comprises: 
     a main body, the main body being provided with two paratactic, a first and a second, hollowed-out parts, the two hollowed-out parts being separated by a clapboard, the main body also including a handle, the handle extending downward from the lower end of the second hollowed-out part, the first hollowed-out part being provided with a deflector rod, one side of the defector rod being near the clapboard, and a deflector spring being located between the other side of the defector rod and the main body; 
     a push rod, the push rod being through the main body and the two hollowed-out parts, the deflector spring and the deflector rod being fixed to the push rod by socket joint; 
     a lever, the lever being connected to the handle of the main body via a shaft, which implements front and back reciprocating motion relative to the handle around the shaft to push the deflector rod to drive the push rod to move forward; 
     the second hollowed-out part being provided with a reset ring, the reset ring being fixed to the push rod by socket joint, and a suitable clearance being provided between the reset ring and the clapboard, which is used as a drawing back space for the reset ring to cut the glue. 
     Preferably, the end adjacent to the clapboard of the reset ring is caverned out at the middle part, and the end adjacent to the main body is provided with a symmetrical opening. 
     Preferably, a bracing sheet is provided at the position where the lever pushes the deflector rod to move to enhance the strength of the lever, so as to improve the precision of the distance that the push rod moving forward for, and to extend the service life of the lever. 
     Preferably, a cover board is located at the upward side of the main body, and the cover board is connected to the main body by snap-fit joint. 
     Preferably, the periphery of the main body extends forward to form the container for containing the cartridge, and the main body is forward in turn provided with a disc spring, a disc, a claw shaped elastic sheet, and a locating guide sleeve; one end of the claw shaped elastic sheet is fixed to the locating guide sleeve, and the other end presses against the main body to compress the disc spring to be shrunk slightly; a baffle plate is also located between the deflector spring and the main body. 
     Preferably, the reset ring is made of rubber. 
     Preferably, an ejector block is also fixed at the front end of the push rod. 
     Preferably, a pull handle is also fixed at the back end of the push rod. 
     The advantages of the present invention are that: 
     1. in the present invention, the second hollowed-out part is provided with a reset ring being fixed to the push rod by socket joint, and a suitable clearance is provided between the reset ring and the clapboard; when the lever drives the push rod to move forward, for a bending deformation is produced at the hollow body at the front part of the reset ring, after the force to move forward is eliminated, the speed of the spring moving backward is increased, so as to make the pressure in the cartridge to be quickly released, which works well to cut the glue, and at the same time prevents the push rod from drawing back too much; 
     2. the present invention adopts the reset ring fixed to the push rod by socket joint to replace the conventional brake rod, so the structure is simple. 
     3. in the present invention, the periphery of the main body extends forward to form the container for containing the cartridge, and the main body is forward in turn provided with a disc spring, a disc, a claw shaped elastic sheet, and a locating guide sleeve; so, a glue gun of this structure can contain a cartridge of different length; when changing the cartridge, the ejector block is used to push the claw shaped elastic sheet backward to shrink the claw shaped elastic sheet; with the action of the disc spring, the cartridge is gently pushed out of the cartridge container, so, on assembling or disassembling the cartridge, the work efficiency is greatly increased. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an overall sectional view of an embodiment of the present invention; 
         FIG. 2  and  FIG. 3  are stereograms of a preferred structure of the reset ring of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The present invention is best understood from the following detailed description with reference to the accompanying figures and embodiments. 
     Referring to  FIG. 1 , the present invention mainly comprises a feeding device and a container containing the cartridge, and the feeding device comprises: 
     a main body  1 , the main body being provided with two paratactic, a first and a second, hollowed-out parts, the two hollowed-out parts being separated by two clapboards  11 ,  22 , the main body also including a handle  10 , the handle  10  extending downward from the lower end of the second hollowed-out part, the first hollowed-out part being provided with a deflector rod  14 , one side of the defector rod being near the clapboard  11 , and a deflector spring  12  being located between the other side of the defector rod and the main body; 
     a push rod  2 , the push rod being through the main body  1  and the two hollowed-out parts, the deflector spring  12  and the deflector rod  14  being fixed to the push rod  2  by socket joint; 
     a lever  3 , the lever being connected to the main body handle  10  via a shaft  26 , which implements front and back reciprocating motion relative to the handle  10  around the shaft  26  to push the deflector rod  14  to drive the push rod  2  to move forward; 
     the second hollowed-out part being provided with a reset ring  13 , the reset ring  13  being fixed to the push rod  2  by socket joint, a suitable clearance being provided between the reset ring  13  and the clapboard  11  to make the reset ring  13  have some space to move at the second hollowed-out part, so as to stop the push rod  2  continuing to draw back as soon as the push rod  2  draws back a little, and to release the pressure in the cartridge, which works well to cut the glue, and at the same time prevents the push rod  2  from drawing back too much; 
     for the position where the lever  3  pushes the deflector rod  14  to move is easy to be damaged because of frequent friction, a bracing sheet  23  being provided at the position to enhance the strength of the lever, so as to improve the precision of the distance that the push rod moving forward for, and to extend the service life of the lever. 
     As a preferred embodiment of the present invention, a cover board  15  is located at the upward side of the main body  1 ; the cover board  15  is connected to the main body  1  by snap-fit joint, so as to make the components in the hollowed-out parts to be capable of being disassembled. 
     As a preferred embodiment of the present invention, the periphery of the main body  1  extends forward to form the container  20  for containing the cartridge, and the main body wall  16  is forward in turn provided with a disc spring  17 , a disc  18 , a claw shaped elastic sheet  19 , and a locating guide sleeve  21 ; one end of the claw shaped elastic sheet  19  is fixed to the locating guide sleeve  21 , and the other end presses against the main body  1  to compress the disc spring  17  to be shrunk slightly. The glue gun of this structure can contain a cartridge of different length; when changing the cartridge, an ejector block is used to push the claw shaped elastic sheet  19  backward to shrink the claw shaped elastic sheet  19 ; with the action of the disc spring  17 , the disc  18  is pushed, and the disc  18  is forced to push the cartridge gently out of the claw shaped elastic sheet  19 , so the operation is very simple and convenient. A baffle plate  22  is also located between the deflector spring  12  and the main body  1  to prevent the deflector spring  12  from moving the guide sleeve  21 , so as not to affect the stability of the cartridge container fixing the cartridge. 
     As a preferred embodiment of the present invention, the reset ring  13  is made of rubber. 
     As a preferred embodiment of the present invention, an ejector block  24  is fixed at the front end of the push rod  2 . 
     As a preferred embodiment of the present invention, the back end of the push rod  2  is also provided with a hook handle or a pull handle  25  fixed via a screw. 
     Referring to  FIG. 2  and  FIG. 3 , they are stereograms of a preferred structure of the reset ring of the present invention. The reset ring  13  adopts elastic materials; the end adjacent to the clapboard of the reset ring  13  is caverned out at the middle part to form a barrel-shaped structure  132 , and the other end is provided with a symmetrical opening  131 ; bending deformation is produced at the front part  133  of the reset ring  13 ; after the force to move forward is eliminated, the speed of the spring moving backward is increased, so as to make the pressure in the cartridge to be quickly released, which works well to cut the glue, and at the same time prevents the push rod from drawing back too much; for the front part is hollow, the reset ring  13  can abut against the push rod, so it is not easy to skid even after being used for multiple times; it has a long service life, and is easy for the push rod to be drawn backward, so the operation is easier. 
     Although the present invention has been described in detail with above said preferred embodiments, but it is only to make the people skilled in the art to understand the present invention, not to limit the scope of the present invention. For those skilled in the art, all the modifications and changes according to the characteristic and spirit of the present invention, are involved in the protected scope of the present invention. So, the protected scope of the present invention should be limited by the attached claims.