Glue gun, glue gun handle and mute assembly

Abstract

The utility model provides a glue gun, a glue gun handle and a mute assembly, and relates to the field of gluing tools, the glue gun comprises a gun body, a fixed handle, a movable handle, a brake pad, a push rod and a spring driving assembly; particularly, the glue gun further comprises a mute assembly; the mute assembly comprises a brake clamping sleeve and an O-shaped ring. A first through hole extending in the axial direction is formed in the middle of the brake clamping sleeve, the O-shaped ring is embedded into the first through hole, and a center hole of the O-shaped ring is coaxial with the first through hole. The brake clamping sleeve is further provided with a second through hole intersecting with the first through hole, and the brake pad penetrates through the second through hole. The push rod penetrates through the first through hole of the brake clamping sleeve, the penetrating hole in the brake piece and the center hole of the O-shaped ring. The glue gun handle and the mute assembly are accessories of the glue gun. The glue gun can reduce and even eliminate noise generated by friction between the push rod and the brake pad when the glue gun is used in the prior art, does not need to be debugged repeatedly, and has the functional effects of stable noise reduction and convenience in use.

Description

Technical Field

[0001] This utility model relates to the field of glue application tools, and in particular to a glue gun, a glue gun handle and a silent component. Background Technology

[0002] As a crucial construction tool, the caulking gun is widely used in various application scenarios. However, existing caulking guns generally face a significant problem during use: noise. Part of the noise comes from the friction between the caulking gun's plunger and the brake pad, which reduces the user's comfort when using the caulking gun.

[0003] To address this issue, engineers attempted to reduce noise by placing an O-ring between the glue gun push rod and the brake pad. However, after each application of glue, the O-ring tended to detach from the mounting hole on the brake pad, requiring the O-ring to be readjusted after each application, which was inconvenient and resulted in a poor user experience. Utility Model Content

[0004] The purpose of this utility model is to provide a glue gun, glue gun handle and a silent component to reduce or even eliminate the noise problem caused by friction between the push rod and the brake pad when using a glue gun in the prior art, and to avoid repeated adjustments, so as to achieve the functional effects of noise reduction, stability and ease of use.

[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0006] In a first aspect, this utility model provides a glue gun, including a gun body, a fixed handle, a movable handle, a brake pad, a push rod, and a spring drive assembly; the rear end of the gun body is fixedly or integrally connected to the top front end of the fixed handle; one end of the brake pad is pivotally connected to the top rear end of the fixed handle and a top spring is provided between the brake pad and the top rear end of the fixed handle, and the other end of the brake pad extends obliquely downward toward the fixed handle; the upper end of the movable handle is pivotally connected to the front interior of the fixed handle; the push rod passes through a through hole provided in the brake pad, and the movable handle is connected to the push rod through the spring drive assembly; in particular, the glue gun also includes a silent component;

[0007] The noise reduction assembly includes a brake sleeve and an O-ring; the brake sleeve has a first through hole extending axially in the middle, the O-ring is embedded in the first through hole and the center hole of the O-ring is coaxial with the first through hole; the brake sleeve also has a second through hole intersecting the first through hole, and the brake pad passes through the second through hole;

[0008] The push rod passes through the first through hole of the brake sleeve, the through hole on the brake pad, and the center hole of the O-ring.

[0009] In an optional embodiment of this example, the first through hole is a stepped hole, which includes a front end segment and a rear end segment. The diameter of the circumcircle of the cross-section of the rear end segment is smaller than the diameter of the cross-section of the front end segment, so as to form a stepped surface at the junction of the front end segment and the rear end segment. The O-ring is embedded in the front end segment of the brake sleeve, and the front end face of the O-ring abuts against the rear surface of the brake pad, and the rear end face of the O-ring abuts against the stepped surface.

[0010] Further optionally, the cross-section of the push rod is polygonal; in the first through hole of the brake sleeve, the front end hole is a circular hole, the rear end hole is a polygonal hole, the number of sides of the polygonal hole is the same as the number of sides of the cross-section of the polygon of the push rod, and each side of the polygon is parallel to each side of the cross-section of the push rod, and the push rod passes through the polygonal hole.

[0011] Further optionally, the circumcircle of the cross-section of the rear end hole segment is concentric with the cross-section of the front end hole segment.

[0012] Optionally, the cross-section of the push rod is hexagonal.

[0013] In addition, in this embodiment, optionally, the brake sleeve is a plastic part and the O-ring is a rubber ring.

[0014] Secondly, this utility model provides a glue gun handle, applied to the glue gun described in any of the foregoing embodiments. The glue gun handle includes at least the fixed handle, movable handle, brake pad, and silencing assembly described in the glue gun provided in the first aspect; the brake pad passes through the second through hole of the brake sleeve in the silencing assembly, and the glue gun handle serves as a glue gun accessory for subsequent assembly with the spring drive assembly and push rod to form a complete glue gun.

[0015] Thirdly, this utility model embodiment also provides a silent component applied to the aforementioned glue gun handle. The silent component includes a brake sleeve and an O-ring. The brake sleeve has a first through hole extending axially in its middle portion and a second through hole intersecting the first through hole. The first through hole is a stepped hole, which includes a front end segment and a rear end segment. The diameter of the circumcircle of the cross-section of the rear end segment is smaller than the diameter of the cross-section of the front end segment, so as to form a stepped surface at the junction of the front end segment and the rear end segment. The front end segment is a circular hole, and the rear end segment is a polygonal hole. The O-ring is embedded inside the front end segment of the brake sleeve.

[0016] The above-described optional embodiments of this utility model can achieve at least the following beneficial effects:

[0017] By adding a noise-silencing component to the glue gun and its handle, the friction between the glue gun push rod and the brake pad is effectively reduced when applying glue, making the glue application quieter and smoother. This significantly reduces noise during glue gun use and improves comfort. In particular, the noise-silencing component includes a brake sleeve in addition to the O-ring 8. This allows the O-ring to be positioned in a certain way, increasing the stability of the O-ring inside the hole on the brake pad and reducing the frequency of the O-ring coming out of the hole. As a result, users do not need to adjust the position of the O-ring after each glue application. Instead, they can readjust the position of the O-ring after multiple uses until it comes out, greatly improving the convenience of use. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the overall structure of a traditional glue gun;

[0020] Figure 2 A schematic diagram of the overall structure of the glue gun provided in an embodiment of this utility model from one perspective;

[0021] Figure 3 for Figure 2 A partial structural diagram of region A in the middle;

[0022] Figure 4 A schematic diagram of the overall structure of the glue gun from another perspective, provided for an embodiment of this utility model;

[0023] Figure 5 for Figure 4 A schematic diagram of the partial structure of region B in the middle;

[0024] Figure 6 A schematic diagram of the assembly structure of the silent component and the push rod in the glue gun provided in this embodiment of the utility model;

[0025] Figure 7 for Figure 6 Explosion-proof diagram of the structure;

[0026] Figure 8 A schematic diagram of the cross-sectional shape of the push rod in the glue gun provided in this embodiment of the utility model;

[0027] Figure 9A schematic diagram of the overall structure of the brake sleeve from one perspective in the silent assembly provided in this embodiment of the utility model;

[0028] Figure 10 A front view of the brake sleeve (based on the front-back direction of the push rod) in the silent assembly provided for the embodiments of this utility model;

[0029] Figure 11 The rear view of the brake sleeve in the silent assembly provided in this embodiment of the utility model (based on the front-back direction of the push rod);

[0030] Figure 12 A schematic diagram of the overall structure of the brake sleeve from another perspective in the silent assembly provided in this embodiment of the utility model;

[0031] Figure 13 for Figure 12 A half-sectional view of the brake caliper shown.

[0032] Figure 14 This is a schematic diagram of the assembly cross section of the brake sleeve and the push rod when the rear end section of the first through hole of the brake sleeve is a circular hole in this embodiment of the present invention.

[0033] Figure 15 In this embodiment of the present invention, the rear end section of the first through hole of the brake sleeve is a polygonal hole. However, when the number of sides of the polygonal hole is inconsistent with the number of sides of the cross-sectional shape of the push rod, the assembly cross-section of the brake sleeve and the push rod is shown in the figure.

[0034] Figure 16 In this embodiment of the present invention, the rear end section of the first through hole of the brake sleeve is a polygonal hole, and the number of sides of the polygonal hole is consistent with the number of sides of the polygonal cross section of the push rod and they are parallel to each other. This is a schematic diagram of the assembly cross section of the brake sleeve and the push rod.

[0035] Icons: 1-Gun body; 2-Fixed handle; 3-Moving handle; 4-Brake pad; 5-Push rod; 6-Spring drive assembly; 61-Drive block; 62-Drive spring; 100-Silence assembly; 7-Brake sleeve; 71-First through hole; 711-Front end hole; 712-Rear end hole; 713-Stepped surface; 72-Second through hole; 8-O-ring. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0039] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, the terms "horizontal" and "vertical" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] A glue gun is a tool for applying glue, such as... Figure 1As shown, the glue gun mainly includes a gun body 1, a fixed handle 2, a movable handle 3, a brake pad 4, a push rod 5, and a spring drive assembly 6; the rear end of the gun body 1 is fixed or integrally connected to the top front end of the fixed handle 2; one end of the brake pad 4 is pivotally connected to the top rear end of the fixed handle 2 and a top spring is provided between the brake pad 4 and the top rear end of the fixed handle 2, and the other end of the brake pad 4 extends downward toward the fixed handle 2 and at an angle; the upper end of the movable handle 3 is pivotally connected to the front interior of the fixed handle 2; the push rod 5 passes through the through hole provided in the brake pad 4, and the movable handle 3 is connected to the push rod 5 through the spring drive assembly 6. The spring drive assembly 6 includes a drive block 61 and a drive spring 62; the drive block 61 is slidably mounted on the push rod 5, and the drive block 61 is hinged to the upper end of the movable handle 3 or the lower end of the drive block 61 abuts against the front side of the upper end of the movable handle 3; the drive spring 62 is sleeved on the outside of the push rod 5, and one end of the drive spring 62 abuts against the drive block 61 and the other end abuts against the rear end face of the gun body 1; a top spring is provided between the brake pad 4 and the top of the fixed handle 2, and the top spring tilts the brake pad 4 so that the push rod 5 is locked in the through hole provided on the brake pad 4.

[0044] In practical use, press the brake pad 4 to extend it vertically, thereby releasing the push rod 5. Pull the push rod 5 to move its front end backward and release the brake pad 4. Place the glue cartridge inside the gun body 1 with the glue outlet facing forward. Pull the movable handle 3 backward. At this time, the upper end of the movable handle 3 can tilt the drive block 61 to lock the push rod 5. At the same time, the upper end of the movable handle 3 pushes the drive block 61 forward, causing the push rod 5 to overcome the friction between the brake pad 4's through hole and the push rod 5 and move forward. This causes the front end of the push rod 5 to press the rear end of the glue cartridge placed inside the gun body 1, thereby dispensing glue from the cartridge. During the forward movement of the drive block 61, the drive spring 62 is compressed. The drive spring 62 ensures that the drive block 61 and the movable handle 3 always have a tendency to return to their original position, so that when the movable handle 3 is released, the drive block 61 returns to its original position and straightens. Repeat this operation to apply glue.

[0045] Existing glue guns generally face a significant problem during use: noise. Part of the noise originates from the friction between the glue gun plunger 5 and the brake pad 4, reducing user comfort. Engineers attempted to reduce this noise by installing an O-ring between the plunger 5 and the brake pad 4. However, after each application, the O-ring tends to detach from the mounting hole on the brake pad, requiring readjustment after each use, which is inconvenient and results in a poor user experience.

[0046] Based on this, the first aspect of this embodiment provides a glue gun, specifically, referring to... Figures 2 to 13The glue gun also includes a silent assembly 100; the silent assembly 100 includes a brake sleeve 7 and an O-ring 8; the brake sleeve 7 has a first through hole 71 extending axially in the middle, the O-ring 8 is embedded in the first through hole 71 and the center hole of the O-ring 8 is coaxial with the first through hole 71; the brake sleeve 7 also has a second through hole 72 intersecting with the first through hole 71, the brake pad 4 passes through the second through hole 72; the push rod 5 passes through the first through hole 71 of the brake sleeve 7, the through hole on the brake pad 4 and the center hole of the O-ring 8.

[0047] In the above structure of this embodiment, by adding the silent component 100, the friction between the push rod 5 and the brake pad 4 during glue application is effectively reduced, making the glue application quieter and smoother. This significantly reduces the noise during the use of the glue gun and improves the comfort of glue application. In particular, the silent component 100 includes a brake sleeve 7 in addition to the O-ring 8. In this way, the O-ring can be positioned to a certain extent by the brake sleeve 7, which increases the stability of the O-ring inside the through hole on the brake pad 4 and reduces the frequency of the O-ring coming out of the through hole on the brake pad 4. As a result, the user does not need to adjust the position of the O-ring after each glue application, but can readjust the position of the O-ring after multiple uses until the O-ring comes out, which greatly improves the convenience of use.

[0048] To increase the reliability of the O-ring in the preset position, further reduce the frequency of O-ring detachment, and thus further improve ease of use, refer to... Figures 6 to 13 In some more preferred embodiments of this example, the first through hole 71 is designed as a stepped hole, which includes a front end segment 711 and a rear end segment 712. The diameter of the circumcircle of the cross-section of the rear end segment 712 is smaller than the diameter of the cross-section of the front end segment 711, so that a stepped surface 713 is formed at the junction of the front end of the rear end segment 712 and the rear end of the front end segment 711. The O-ring 8 is embedded in the front end segment 711 of the brake sleeve 7, and the front end face of the O-ring 8 abuts against the rear surface of the brake pad 4, while the rear end face of the O-ring 8 abuts against the stepped surface 713. The stepped hole design makes the stepped surface 713 a rear limiting surface for the O-ring 8, which can ensure that the O-ring 8 is stably limited in front of the stepped surface 713, preventing the O-ring from detaching from the mounting hole on the brake pad 4 from the rear end segment of the first through hole, and further reducing the frequency of readjusting the O-ring position.

[0049] Compared with the prior art, the glue gun provided by the above-mentioned preferred embodiment of this example can achieve noise reduction while reducing the frequency of readjusting the silent component 100, thus achieving more convenient operation and a better user experience. However, during the experiment, the applicant found that after multiple uses, the O-ring of the glue gun provided by the above-mentioned preferred embodiment may still come off the first through hole 71. The applicant's research found that there are two main influencing factors causing this technical problem: (1) whether the cross-sectional shape of the front end hole segment 711 and the cross-sectional shape of the rear end hole segment 712 of the first through hole 71 are consistent; (2) whether the cross-sectional shape of the rear end hole segment 712 of the first through hole 71 is consistent with the cross-sectional shape of the push rod 5. Specifically, in the above-mentioned preferred embodiment of this example: (1) the cross-sectional shape of the front end hole segment 711 and the cross-sectional shape of the rear end hole segment 712 of the first through hole 71 can be as follows: Figure 14 The same can also be shown as Figure 15 and Figure 16 The cross-sectional shape of the rear end section 712 of the first through hole 71 is different from that of the push rod 5. Figure 16 The same can also be shown as Figure 14 and Figure 15 Although the methods shown are different, they can all achieve the aforementioned effect of reducing the frequency of readjusting the mute component 100 compared to existing technologies, resulting in more convenient operation and a better user experience. However: if... Figure 14 As shown, the front end segment 711 and the rear end segment 712 of the first through hole 71 are designed to be circular in shape. However, the cross-sectional shape of the rear end segment 712 is inconsistent with that of the push rod 5. Therefore, a fan-shaped gap G1 will appear between the polygonal push rod 5 and the inner wall of the circular rear end segment. After long-term and repeated use, during a certain pulling or pulling process of the push rod 5, the O-ring 8 will detach outward from these locally abruptly enlarging fan-shaped gaps G1. If... Figure 15 As shown, although the cross-sectional shapes of the front end segment 711 and the rear end segment 712 of the first through hole 71 are different (i.e., the front end segment 711 is a circular hole and the rear end segment 712 is a polygonal hole), the cross-sectional shape of the rear end segment 712 is not consistent with the cross-sectional shape of the push rod 5. The number of sides of the cross-sectional shape of the rear end segment 712 is greater than that of the cross-sectional shape of the push rod 5. Therefore, special abrupt shape gaps G2 will appear between the inner walls of the polygonal push rod 5 and the rear end segment 712. After long-term and repeated use, during a certain pulling and pulling process of the push rod 5, the O-ring 8 will flip outward and detach from these locally abrupt shape gaps G2. Only when... Figure 16As shown, in the design of the brake sleeve 7, the first through hole 71 is a stepped hole, with its front end segment 711 being a circular hole and its rear end segment 712 being a polygonal hole. The number of sides of this polygonal hole is the same as the number of sides of the cross-section of the polygon of the push rod 5, and each side of the polygon is parallel to each side of the cross-section of the push rod 5. The push rod 5 passes through this polygonal hole, as shown. Figure 16 As shown, each side of the polygonal cross-section of the push rod 5 forms a parallel gap G3 with each side of the cross-section of the first through hole 71 on the brake sleeve 7. In this case, no O-ring detachment occurred after multiple uses. Therefore, in the preferred embodiment of this application, based on the cross-sectional shape of the push rod 5, and using... Figure 16 The design of the first through hole 71 of the brake sleeve 7 ensures a tight fit between the push rod 5, the O-ring 8 and the rear end hole 712 of the first through hole 71 of the brake sleeve 7, preventing the O-ring 8 from turning outward.

[0050] In this preferred embodiment, optionally but not limited to, the circumcircle of the cross-section of the rear end hole segment 712 and the cross-section of the front end hole segment 711 are concentric circles.

[0051] Optionally, but not limited to, the cross-section of push rod 5 may be hexagonal.

[0052] In addition, in this embodiment, optionally but not limited to, the brake sleeve 7 is made of plastic (in other optional embodiments, it may also be made of polymer materials or rubber, etc.), and the O-ring 8 is a rubber ring (in other optional embodiments, it may also be made of polymer or other materials).

[0053] In addition, the second aspect of this embodiment provides a glue gun handle, which is applied to the glue gun provided in any of the aforementioned optional embodiments. The glue gun handle includes at least the fixed handle 2, the movable handle 3, the brake pad 4 and the silencing component 100 described in the glue gun provided in the first aspect. The brake pad 4 passes through the second through hole 72 of the brake sleeve 7 in the silencing component 100. The glue gun handle serves as a glue gun accessory for subsequent assembly with the spring drive component 6 and the push rod 5 to form a complete glue gun.

[0054] In addition, the third aspect of this embodiment also provides a silent component 100, which is applied to the aforementioned glue gun handle. The silent component 100 includes a brake sleeve 7 and an O-ring 8. The brake sleeve 7 has a first through hole 71 extending axially in the middle and a second through hole 72 intersecting with the first through hole 71. The first through hole 71 is a stepped hole, which includes a front end hole segment 711 and a rear end hole segment 712. The diameter of the circumcircle of the cross section of the rear end hole segment 712 is smaller than the diameter of the cross section of the front end hole segment 711, so as to form a stepped surface 713 at the junction of the front end of the rear end hole segment 712 and the rear end of the front end hole segment 711. The front end hole segment 711 is a circular hole and the rear end hole segment 712 is a polygonal hole. The O-ring 8 is embedded in the front end hole segment 711 of the brake sleeve 7.

[0055] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A glue gun, comprising a gun body (1), a fixed handle (2), a movable handle (3), a brake pad (4), a push rod (5), and a spring drive assembly (6); the rear end of the gun body (1) is fixed or integrally connected to the top front end of the fixed handle (2); one end of the brake pad (4) is pivotally connected to the top rear end of the fixed handle (2) and a top spring is provided between the brake pad (4) and the top rear end of the fixed handle (2), and the other end of the brake pad (4) extends obliquely downward toward the fixed handle (2); the upper end of the movable handle (3) is pivotally connected to the front interior of the fixed handle (2); the push rod (5) passes through a through hole provided in the brake pad (4), and the movable handle (3) is connected to the push rod (5) through the spring drive assembly (6); characterized in that: The glue gun also includes a silent component (100); The noise reduction assembly (100) includes a brake sleeve (7) and an O-ring (8); the brake sleeve (7) has a first through hole (71) extending axially in the middle, the O-ring (8) is embedded in the first through hole (71) and the center hole of the O-ring (8) is coaxial with the first through hole (71); the brake sleeve (7) also has a second through hole (72) intersecting with the first through hole (71), and the brake pad (4) passes through the second through hole (72); The push rod (5) passes through the first through hole (71) of the brake sleeve (7), the through hole on the brake pad (4), and the center hole of the O-ring (8).

2. The glue gun according to claim 1, characterized in that: The first through hole (71) is a stepped hole, which includes a front hole section (711) and a rear hole section (712). The diameter of the circumcircle of the cross section of the rear hole section (712) is smaller than the diameter of the cross section of the front hole section (711), so as to form a stepped surface (713) at the junction of the front end of the rear hole section (712) and the rear end of the front hole section (711). The O-ring (8) is embedded in the front end hole (711) of the brake sleeve (7), and the front end face of the O-ring (8) abuts against the rear surface of the brake pad (4), and the rear end face of the O-ring (8) abuts against the stepped surface (713).

3. The glue gun according to claim 2, characterized in that: The cross-section of the push rod (5) is polygonal; in the first through hole (71) of the brake sleeve (7), the front end hole (711) is a circular hole, and the rear end hole (712) is a polygonal hole. The number of sides of the polygonal hole is the same as the number of sides of the cross-section of the polygon of the push rod (5), and each side of the polygon is parallel to each side of the cross-section of the push rod (5). The push rod (5) passes through the polygonal hole.

4. The glue gun according to claim 3, characterized in that: The circumcircle of the cross-section of the rear end hole section (712) is concentric with the cross-section of the front end hole section (711).

5. The glue gun according to claim 3, characterized in that: The cross-section of the push rod (5) is hexagonal.

6. The glue gun according to any one of claims 1-5, characterized in that: The brake sleeve (7) is a plastic part, and the O-ring (8) is a rubber ring.

7. A glue gun handle, characterized in that: The glue gun is applied to any one of claims 1 to 6; the glue gun handle includes at least the fixed handle (2), the movable handle (3), the brake pad (4) and the silent assembly (100); the brake pad (4) passes through the second through hole (72) of the brake sleeve (7) in the silent assembly (100).

8. A silent assembly (100) applied to the glue gun handle of claim 7, characterized in that: Includes brake sleeve (7) and O-ring (8); The brake sleeve (7) has a first through hole (71) extending axially in the middle and a second through hole (72) intersecting with the first through hole (71); The first through hole (71) is a stepped hole, which includes a front hole section (711) and a rear hole section (712). The diameter of the circumcircle of the cross section of the rear hole section (712) is smaller than the diameter of the cross section of the front hole section (711), so as to form a stepped surface (713) at the junction of the front end of the rear hole section (712) and the rear end of the front hole section (711). The front hole section (711) is a circular hole, and the rear hole section (712) is a polygonal hole. The O-ring (8) is embedded in the front end hole (711) of the brake sleeve (7).

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