Caulking gun with device capable of easily adjusting opening of trigger

Abstract

A caulking gun with a device capable of easily adjusting trigger opening comprises a gun body, a propelling device, a reset spring, a trigger, a glue containing device and a retaining device, the upper portion of the gun body is of a frame structure and comprises a front stand column, a rear stand column, an upper beam and a lower beam, the rear stand column downwards extends out of a grip of the gun body, and the glue containing device is installed on the front portion of the front stand column of the gun body. The propelling device comprises a propelling piece and a propelling rod assembly, the propelling piece is installed in the frame structure, and the propelling rod assembly transversely penetrates through the retaining device, the gun body rear stand column, the propelling piece, the reset spring, the gun body front stand column and the glue containing device. The trigger is hinged to the lower cross beam through a pivot shaft and can be matched with the grip to drive the propelling device to press glue, the pivot shaft is adjustably installed in a kidney-shaped hole of the lower cross beam, and an adjusting device capable of changing and positioning the position of the pivot shaft is arranged in the lower cross beam. The position of the pivot shaft is changed through the adjusting device, so that the opening of the trigger is easily adjusted.

Description

Technical Field

[0001] The present invention relates to a caulking gun, in particular to a caulking gun with an easily adjustable trigger opening device. Background Art

[0002] Caulking guns are widely used as hand tools in fields such as architectural decoration and industrial manufacturing. Various colloids for different purposes are applied through caulking guns. Commonly seen caulking guns on the market generally include a gun body, a propulsion device, a return spring, a trigger, a glue storage device, and a backstop device. The glue storage device is installed at the front of the gun body. The propulsion device includes a propulsion piece and a propulsion rod assembly. The propulsion piece is installed inside the gun body. The propulsion rod assembly horizontally penetrates through the backstop device, the gun body, the propulsion piece, the return spring, and the glue storage device. The upper part of the gun body is a frame-shaped structure, including front and rear columns and upper and lower crossbeams. The pivot shaft under the trigger is hinged to the lower crossbeam of the gun body and cooperates with the grip extending downward from the rear column of the gun body and the backstop device installed at the rear end of the gun body. By pushing the propulsion piece through the drive shaft above the trigger to drive the propulsion rod assembly, the colloid in the glue storage device is stepwise extruded onto the surface of the object to be applied. For a caulking gun with such a structure, since the positions of the pivot shaft and the drive shaft of the trigger are relatively fixed, the maximum opening between the trigger and the gun body grip is also fixed. However, due to the significant differences in the palm sizes of users in different countries and regions, the caulking gun with a fixed opening cannot meet the comfort requirements of different operators at the same time. In addition, different types of colloids have different requirements for the glue output of the caulking gun trigger within a full stroke. Therefore, this caulking gun with a fixed opening also cannot well meet the requirements of different colloids with different glue outputs.

[0003] To this end, some caulking gun practitioners have attempted to improve the trigger opening with adjustable adjustment, including a technical solution with publication number CN2726739Y and titled "Caulking Gun"; a technical solution with publication number CN2784091Y and titled "Caulking Gun"; a technical solution with publication number CN108722813B and titled "A caulking gun with adjustable stroke", and a technical solution with publication number CN217569507U and titled "A novel caulking gun with adjustable stroke", etc. Among them: CN108722813B, the technical solution with title "A caulking gun with adjustable stroke", comprises a barrel, a trigger, a handle, a spring, a driving rod, and a driving block; it also has a stroke adjustment component and a sliding track; the sliding track is located at the upper part of the inner cavity of the handle, and the sliding track runs through the inner cavity of the handle from the upper part of the inner cavity of the handle and is a straight groove; the The travel adjustment component is composed of a travel limit ring, a travel limit rod, a sliding piece, a first sliding clamping edge, and a second sliding clamping edge. The travel adjustment component is an integrated structure, a travel limit hole is provided inside the travel limit ring, the travel limit rod is connected to the travel limit ring and is located above the travel limit ring, the sliding piece is connected to the travel limit rod and is located above the travel limit rod, the first sliding clamping edge is located at the right lower side of the sliding piece, a first sliding clamping groove is formed between the first sliding clamping edge and the sliding piece, the second sliding clamping edge is located at the left lower side of the sliding piece, and a second sliding clamping groove is formed between the second sliding clamping edge and the sliding piece, the left side of the sliding piece has a sliding piece positioning hole that penetrates from the upper surface downward to the second sliding clamping groove, and the shape of the lower edge of the sliding piece matches the upper surface of the upper part of the handle inner cavity; the travel limit rod can slide along the sliding track; the driving rod coaxially penetrates the travel adjustment component, the driving block, the spring, and the cylinder in sequence. This technical solution is to drive the nut base to slide along the sliding track in the gun body cavity through the adjusting bolt, drive the driving block and then push the driving shaft above the trigger to move forward and backward, thereby achieving the purpose of adjusting the gap between the trigger and the grip, and thus changing the maximum single forward stroke of the driving rod, so as to achieve the effect of adjustable single extrusion glue amount. However, its disadvantages are that there are many parts and complex structure, especially the adjusting nut base needs to be molded or machined and customized, and the manufacturing cost is high; and because the front end of the driving block in this solution is subjected to the reaction force of the spring, and the reaction force is also applied to the nut base, the adjusting bolt and the adjusting nut behind the driving block, it will cause the adjusting nut to be laborious when turning the adjusting bolt, or the outer ring size of the adjusting nut needs to be increased, resulting in the overall appearance of the caulking gun being inconsistent.

[0004] The technical solution with publication number CN217569507U and name "A new type of adjustable stroke glue gun" discloses a barrel, a power push rod mechanism including a push rod and a push plate, a handle, and a trigger. An adjusting bolt is provided in the inner cavity of the handle, the adjusting bolt is fixedly connected to the inner cavity wall of the handle, a stroke adjusting nut is movably provided on the adjusting bolt, the front end of the stroke adjusting nut corresponds to the push plate, the push rod passes through the inner cavity of the handle, the adjusting bolt and the stroke adjusting nut, the push plate, and the barrel in sequence for assembly. Compared with the technical solution of CN108722813B mentioned above, this technical solution uses fewer parts in the adjustment part and is easier to manufacture, but the push plate, the adjusting nut and the adjusting bolt are also subject to the reaction force of the spring, which makes it difficult to rotate the adjusting nut, or requires increasing the outer ring size of the adjusting nut, resulting in an overall inharmonious appearance of the caulking gun. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention proposes a caulking gun with an easily adjustable trigger opening device, and the trigger opening device is arranged in the lower cross beam of the gun body frame to avoid the reaction force of the front end spring of the propulsion piece (or drive block), and the trigger opening is easily adjusted by changing the position of the trigger pivot axis in the lower cross beam.

[0006] The technical solution adopted by the present invention is:

[0007] A caulking gun with an easily adjustable trigger opening device comprises a gun body, a propulsion device, a reset spring, a trigger, a glue holding device and a backstop device, the upper part of the gun body is a frame structure, comprising front and rear columns and upper and lower beams, the rear column extends downwardly out of the grip of the gun body, the glue holding device is installed at the front of the front column of the gun body, the propulsion device comprises a propulsion sheet and a propulsion rod assembly, the propulsion sheet is installed inside the frame structure, the propulsion rod assembly horizontally penetrates the backstop device, the rear column of the gun body, the propulsion sheet, the reset spring, the front column of the gun body and the glue holding device, the trigger is hinged to the lower beam through a pivot shaft and can cooperate with the grip to drive the propulsion device to press glue, the pivot shaft position is adjustably installed in the waist-shaped hole of the lower beam, and an adjustment device capable of changing and positioning the pivot shaft position is arranged in the lower beam. The present invention changes the pivot shaft position through the adjustment device, and does not involve other structural components of the caulking gun, thereby realizing easy adjustment of the trigger opening.

[0008] Furthermore, the waist-shaped hole is arranged horizontally, and the pivot shaft is arranged in the waist-shaped hole so as to be movable forward and backward. The present invention adjusts the opening of the trigger by changing the horizontal position of the pivot shaft.

[0009] Alternatively, the waist-shaped hole is vertically arranged, and the pivot shaft is arranged in the waist-shaped hole so as to be movable up and down. The invention adjusts the opening of the trigger by changing the longitudinal position of the pivot shaft.

[0010] Alternatively, the kidney-shaped hole is inclined, and the pivot shaft is inserted through the kidney-shaped hole so as to be movable in the front-back and up-down directions. The present invention adjusts the opening degree of the trigger by changing the horizontal and longitudinal position of the pivot shaft.

[0011] Furthermore, the adjusting device includes a screw rod and an adjusting knob. The screw rod has a mating portion capable of changing and positioning the position of the pivot shaft, and the screw rod has a threaded portion screwed with the adjusting knob. The adjusting knob is rotatably installed in the limiting block of the lower cross beam. When the adjusting knob rotates, the screw rod moves accordingly, thereby changing and positioning the position of the pivot shaft.

[0012] Alternatively, the adjusting device includes a movable member and an adjusting member. The movable member has a mating portion capable of changing and positioning the position of the pivot shaft. The movable member abuts against the adjusting member. The adjusting member is installed in the limiting block of the lower cross beam so as to be movable relative to the lower cross beam after rotation. When the adjusting member rotates, the adjusting member moves, and the movable member moves accordingly, thereby changing and positioning the position of the pivot shaft.

[0013] Furthermore, a clearance eliminating device for eliminating the installation clearance is provided between the adjusting device and the lower cross beam, so as to eliminate the installation clearance between the adjusting device and the lower cross beam, eliminate the play of the pivot shaft of the trigger in the kidney-shaped hole, and improve the product grade and the operation comfort.

[0014] Furthermore, the clearance eliminating device is a clearance eliminating spring or a magnetic force device, which has low cost and is convenient for installation.

[0015] Furthermore, the adjusting device is horizontally arranged in the lower cross beam, which is convenient for processing and reduces the cost.

[0016] Alternatively, the adjusting device is vertically or obliquely arranged in the lower cross beam, providing more installation methods, so as to form different adjustment options.

[0017] The beneficial effects of the present invention: The adjusting trigger opening device is arranged in the lower cross beam of the gun body frame. By changing the position of the pivot shaft of the trigger in the lower cross beam, the trigger opening can be easily adjusted, so as to avoid the reaction force of the spring at the front end of the pushing piece (or the driving block), realize the easy adjustment of the trigger opening, and has a simple, reliable and compact structure, convenient adjustment and lower manufacturing cost. Description of the Drawings

[0018] Figure 1 is a schematic structural view of the trigger opening at the maximum position in the first embodiment of the present invention.

[0019] Figure 2 is Figure 1 a partial cross-sectional view at the adjusting device in

[0020] Figure 3 is Figure 2Schematic enlarged view of the structure at position I in the middle.

[0021] Figure 4 It is a schematic view of the structure when the trigger opening of the first embodiment of the present invention is at the minimum.

[0022] Figure 5 It is a partially sectional enlarged view of the adjusting device of the second embodiment of the present invention.

[0023] Figure 6 It is a partially sectional enlarged view of the adjusting device of the third embodiment of the present invention.

[0024] Figure 7 It is a partially sectional enlarged view of the adjusting device of the fourth embodiment of the present invention.

[0025] In the figure: 1. Gun body, 1a. Front column, 1b. Rear column, 1c. Upper crossbeam, 1d. Lower crossbeam, 1e. Grip, 1f. First kidney-shaped hole, 1f'. Second kidney-shaped hole, 1f''. Third kidney-shaped hole, 1g. First limit stop, 1g'. Second limit stop, 1g''. Third limit stop, 1g'''. Fourth limit stop, 2a. Pushing piece, 2b. Pushing rod assembly, 3. Return spring, 4. Trigger, 4a. Pivot shaft, 4b. Driving shaft, 5. Glue holding device, 6. Anti-backlash device, 7. Adjusting device, 7a. First screw, 7a'. Second screw, 7a''. Movable part, 7a'''. Third screw, 7b. First adjusting knob, 7b'. Second adjusting knob, 7b''. Adjusting part, 7b'''. Third adjusting knob, 7c. First backlash elimination device, 7c'. Second backlash elimination device. Specific embodiments

[0026] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all alternative solutions, improvement solutions, and equivalent solutions that may be included within the scope of the claims.

[0027] Embodiment 1

[0028] Refer to Figures 1-4, A glue gun with an easily adjustable trigger opening device, comprising a gun body 1, a propulsion device, a return spring 3, a trigger 4, a glue holding device 5 and a backstop device 6. The upper part of the gun body 1 is a frame structure, including a front column 1a, a rear column 1b, an upper cross beam 1c and a lower cross beam 1d. The rear column 1b extends downward to form a grip 1e of the gun body 1. The glue holding device 5 is installed at the front of the front column 1a of the gun body 1. The propulsion device includes a propulsion piece 2a and a propulsion rod assembly 2b. The propulsion piece 2a is installed inside the frame structure. The propulsion rod assembly 2b horizontally penetrates through the backstop device 6, the rear column 2b, the propulsion piece 2a, the return spring 3, the front column 1a and the glue holding device 5. The trigger 4 is hinged to the lower cross beam 1d through a pivot shaft 4b and can cooperate with the grip 1e to drive the propulsion device to apply glue. A drive shaft 4a for driving the propulsion piece 2a is provided at the upper end of the trigger 4. The pivot shaft 4b is adjustably installed in a first kidney-shaped hole 1f of the lower cross beam 1d. An adjusting device 7 capable of changing and positioning the position of the pivot shaft 4b is provided inside the lower cross beam 1d. By changing the position of the pivot shaft 4b through the adjusting device in the present invention, and without involving other structural components of the glue gun, the trigger 4 opening can be easily adjusted.

[0029] In this embodiment, the first kidney-shaped hole 1f is horizontally arranged, and the pivot shaft 4b is movably inserted in the first kidney-shaped hole 1f in the front-rear direction. The opening degree of the trigger 4 is adjusted by changing the horizontal position of the pivot shaft 4b in the present invention. When the pivot shaft 4b is located at the front end of the first kidney-shaped hole 1f, the trigger 4 is at the maximum opening degree, as Figure 1 shown; when the pivot shaft 4b is located at the rear end of the first kidney-shaped hole 1f, the trigger 4 is at the minimum opening degree, as Figure 4 shown.

[0030] In this embodiment, the adjusting device 7 is horizontally arranged inside the lower cross beam 1d, and includes a first screw rod 7a and a first adjusting knob 7b. The first screw rod 7a has a matching part capable of changing and positioning the position of the pivot shaft 4b. The first screw rod 7a has a threaded part screwed with the first adjusting knob 7b. The first adjusting knob 7b is rotatably installed in a first limiting gear 1g of the lower cross beam 1d. When the first adjusting knob 7b rotates, the first screw rod 7a moves accordingly to change and position the position of the pivot shaft 4b. Specifically, the pivot shaft 4b penetrates through the matching part. The first screw rod 7a has an external threaded part, and the first adjusting knob 7b has an internal threaded part. Due to the limitation of the first limiting gear 1g, the first adjusting knob 7b can only rotate. When rotating, due to the screwing of the external threaded part and the internal threaded part, the rotation is converted into the axial movement of the first screw rod 7a, thereby driving the pivot shaft 4b to move along the first kidney-shaped hole 1f, so as to realize the adjustment of the trigger opening. Due to the screwing, the positions of the first screw rod 7a and the first adjusting knob 7b can be directly positioned after moving, ensuring the stability of the opening adjustment.

[0031] The present invention disposes the trigger opening adjusting device within the lower cross beam of the gun body frame. By changing the position of the pivot shaft of the trigger within the lower cross beam, easy adjustment of the trigger opening is achieved, thereby avoiding the reaction force of the spring at the front end of the pushing piece (or driving block), realizing easy adjustment of the trigger opening, and having a simple, reliable, and compact structure, convenient adjustment, and lower manufacturing cost.

[0032] Embodiment 2

[0033] Referring to Figure 5 , the difference between this embodiment and Embodiment 1 lies in that: the adjusting device 7 in this embodiment includes a second screw 7a' and a second adjusting knob 7b'. The second screw 7a' has a mating portion capable of changing and positioning the position of the pivot shaft 4b. The second screw 7a' has a threaded portion screwed with the second adjusting knob 7b'. The second adjusting knob 7b' is rotatably installed within the second limiting slot 1g' of the lower cross beam 1d. When the second adjusting knob 7b' rotates, the second screw 7a' moves accordingly to change and position the position of the pivot shaft 4b. Specifically, the pivot shaft 4b passes through the mating portion. The second screw 7a' has an internal threaded portion, and the second adjusting knob 7b' has an external threaded portion. Due to the limitation of the second limiting slot 1g', the second adjusting knob 7b' can only rotate. When rotating, due to the screwing of the external threaded portion and the internal threaded portion of the second screw 7a', the rotation is converted into the axial movement of the second screw 7a', thereby driving the pivot shaft 4b to move along the first kidney-shaped hole 1f, thus realizing the adjustment of the trigger opening. Due to the screwing, the positions of the second screw 7a' and the second adjusting knob 7b' can be directly positioned after movement, ensuring the stability of the opening adjustment.

[0034] A first clearance eliminating device 7c for eliminating the installation clearance is provided between the adjusting device 7 and the lower cross beam 1d in this embodiment, eliminating the installation clearance between the adjusting device 7 and the lower cross beam 1d, eliminating the play of the pivot shaft 4b of the trigger 4 within the kidney-shaped hole, and improving the product grade and the comfort of operation. The first clearance eliminating device is a magnetic device, which has a low cost and is convenient for installation.

[0035] The remaining structures and functions can refer to those described in Embodiment 1.

[0036] Embodiment 3

[0037] Referring to Figure 6 , the difference between this embodiment and Embodiment 1 lies in that: the kidney-shaped hole in this embodiment is inclined. The pivot shaft 4b is movably inserted into the second kidney-shaped hole 1f' in the front-back and up-down directions. The present invention adjusts the opening degree of the trigger 4 by changing the horizontal and longitudinal positions of the pivot shaft 4b.

[0038] The adjusting device 7 in this embodiment includes a movable member 7a'' and an adjusting member 7b''. The movable member 7a'' has a mating portion capable of changing and positioning the position of the pivot shaft 4b. The movable member 7a'' abuts against the adjusting member 7b''. The adjusting member 7b'' is installed in the third limiting slot 1g'' of the lower cross beam 1d and can move relative to the lower cross beam 1d after rotation. When the adjusting member 7b'' rotates, the adjusting member 7b'' moves, and the movable member 7a'' moves accordingly, thereby changing and positioning the position of the pivot shaft 4b. Specifically, the adjusting member 7b'' has an external thread portion and a rotating portion. The external thread portion is screwed to the rear end of the lower cross beam 1d. When the rotating portion is rotated, the external thread portion rotates and moves synchronously, and then drives the movable member 7a'' abutting against it to push the pivot shaft 4b of the trigger 4 to adjust the opening degree of the trigger 4.

[0039] A second clearance eliminating device 7c' for eliminating the installation clearance is provided between the adjusting device 7 and the lower cross beam 1d in this embodiment, which eliminates the installation clearance between the adjusting device 7 and the lower cross beam 1d, eliminates the play of the pivot shaft 4b of the trigger 4 in the kidney-shaped hole, and improves the product grade and the comfort of operation. The second clearance eliminating device 7c' is a clearance eliminating spring. One end of the clearance eliminating spring is connected to the movable member 7a'', and the other end is connected to the lower cross beam 1d, which has low cost and is convenient for installation.

[0040] The rest of the structure and functions can refer to those described in Embodiment 1.

[0041] Embodiment 4

[0042] See Figure 7 , the difference between this embodiment and Embodiment 1 is that the kidney-shaped hole in this embodiment is vertically arranged. The pivot shaft 4b is vertically movably arranged in the third kidney-shaped hole 1f''. The present invention adjusts the opening degree of the trigger 4 by changing the longitudinal position of the pivot shaft 4b.

[0043] The adjusting device 7 in this embodiment is inclinedly arranged in the lower cross beam 1d. Of course, it can also be vertically installed to provide more installation methods, thus forming different adjustment options. The adjusting device 7 includes a third screw 7a''' and a third adjusting knob 7b'''. The third screw 7a''' has a mating portion capable of changing and positioning the position of the pivot shaft 4b. The third screw 7a''' has a threaded portion screwed with the third adjusting knob 7b'''. The third adjusting knob 7b''' is rotatably installed in the fourth limiting slot 1g''' of the lower cross beam 1d. When the third adjusting knob 7b''' rotates, the third screw 7a''' moves accordingly to change and position the position of the pivot shaft 4b. Specifically, the pivot shaft 4b is supported by the mating portion in the third kidney-shaped hole 1f''. The third screw 7a''' has an external threaded portion, and the third adjusting knob 7b''' has an internal threaded portion. Due to the limitation of the fourth limiting slot 1g''', the third adjusting knob 7b''' can only rotate. When rotating, due to the screwing of the external threaded portion and the internal threaded portion, the rotation is converted into the axial movement of the third screw 7a''', so that the pivot shaft 4b can move up and down along the third kidney-shaped hole 1f'', thereby realizing the opening adjustment of the trigger 4. Due to the screwing, the positions of the third screw 7a''' and the third adjusting knob 7b''' can be directly positioned after movement, ensuring the stability of the opening adjustment.

[0044] For the rest of the structure and functions, reference can be made to those described in Embodiment 1.

Claims

1. A glue gun with an easily adjustable trigger opening device, comprising a gun body, a propulsion device, a return spring, a trigger, a glue holding device and a back-stop device, the upper part of the gun body is a frame structure, comprising front and rear columns and upper and lower cross beams, the rear column extends downward from the grip of the gun body, the glue holding device is installed at the front of the front column of the gun body, the propulsion device comprises a propulsion sheet and a propulsion rod assembly, the propulsion sheet is installed inside the frame structure, the propulsion rod assembly transversely penetrates the back-stop device, the rear column of the gun body, the propulsion sheet, the return spring, the front column of the gun body and the glue holding device, the trigger is hinged to the lower cross beam through a pivot shaft and can cooperate with the grip to drive the propulsion device to press glue, characterized in that: The pivot axis is adjustably installed in the waist-shaped hole of the lower cross beam, and an adjusting device capable of changing and positioning the position of the pivot axis is arranged in the lower cross beam.

2. A caulking gun with an easily adjustable trigger opening device according to claim 1, characterized in that: The waist-shaped hole is arranged horizontally, and the pivot shaft is arranged in the waist-shaped hole so as to be movable forward and backward.

3. The caulking gun with an easily adjustable trigger opening device according to claim 1, characterized in that: The waist-shaped hole is vertically arranged, and the pivot shaft is arranged in the waist-shaped hole so as to be movable up and down.

4. The caulking gun with an easily adjustable trigger opening device according to claim 1, characterized in that: The waist-shaped hole is arranged obliquely, and the pivot shaft is arranged in the waist-shaped hole so as to be movable forward, backward, upward and downward.

5. A caulking gun with an easily adjustable trigger opening device according to any one of claims 1 to 4, characterized in that: The adjusting device includes a screw and an adjusting knob. The screw has a matching portion that can change and locate the position of the pivot shaft. The screw has a threaded portion that is threadedly connected to the adjusting knob. The adjusting knob is rotatably installed in a limit stop of the lower beam. When the adjusting knob is rotated, the screw moves along with it to change and locate the position of the pivot shaft.

6. A caulking gun with an easily adjustable trigger opening device according to any one of claims 1 to 4, characterized in that: The adjusting device includes a movable part and an adjusting part. The movable part has a matching part that can change and locate the position of the pivot shaft. The movable part abuts against the adjusting part. The adjusting part can be installed in the limit gear of the lower beam after rotating and moving relative to the lower beam. When the adjusting part rotates, the adjusting part moves, and the movable part changes and locates the position of the pivot shaft as it moves.

7. The caulking gun with an easily adjustable trigger opening device according to claim 1, characterized in that: A gap eliminating device for eliminating installation gap is arranged between the adjusting device and the lower cross beam, thereby eliminating the installation gap between the adjusting device and the lower cross beam.

8. The caulking gun with an easily adjustable trigger opening device according to claim 7, characterized in that: The anti-backlash device is an anti-backlash spring or a magnetic device.

9. The caulking gun with an easily adjustable trigger opening device according to claim 1, characterized in that: The adjusting device is horizontally arranged in the lower cross beam.

10. The caulking gun with an easily adjustable trigger opening device according to claim 1, characterized in that: The adjusting device is arranged vertically or obliquely in the lower cross beam.

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