A push piece for a glue gun

Abstract

This utility model relates to the technical field of glue gun components, and in particular to a pusher for a glue gun; it includes a push rod on the glue gun, a threaded rod extending coaxially at the inner end of the push rod, a front bolt and a rear bolt at both ends of the threaded rod, and a pusher assembly on the threaded rod between the front bolt and the rear bolt; the pusher assembly includes a first pusher, a second pusher, and a pusher head in sequence along the pushing direction of the push rod; this utility model achieves dual-mode sealing through a reconfigurable pusher assembly; it provides triple dynamic sealing to prevent backflow under structural adhesive conditions, and axisymmetric rigid sealing with zero leakage under glass adhesive conditions; the bimetallic pusher with a diameter gradient design reduces assembly stress, and the elastic flange adapts to different viscosity adhesives for efficient operation.

Description

Technical Field

[0001] This utility model relates to the technical field of glue gun components, and in particular to a pusher for glue guns. Background Technology

[0002] A pusher plate for a glue gun is a key transmission component installed at the front end of the glue gun push rod. Its core function is to directly contact the glue itself, effectively transmitting the axial thrust generated by the glue gun push rod to the glue, thereby forcing the glue to be squeezed out from the front end of the glue tube. The pusher plate directly affects the pushing efficiency, sealing effect, and stability of the glue dispensing process, and is one of the core components to ensure the normal operation of the glue gun and prevent glue leakage.

[0003] Currently, manual or pneumatic glue guns are widely used in construction, decoration, manufacturing and other fields. The types of adhesives they mainly handle are mainly structural adhesives and glass adhesives. Structural adhesives, such as silicone structural adhesives or polyurethane structural adhesives, are usually relatively soft and have high viscosity, while glass adhesives, such as silicone sealants, are relatively hard and have higher viscosity.

[0004] For these two different working conditions, the mainstream glue gun pusher assembly generally adopts a combination structure of a metal pusher and a pusher head with a soft rubber flange. However, this design has significant drawbacks in practical applications. First, it has poor adaptability and is cumbersome to operate. When applying softer structural adhesives, the pusher head is required, relying on the soft rubber flange on it to tightly adhere to the inner wall of the glue tube to form an effective seal and prevent the adhesive from flowing back or leaking from gaps. However, when applying harder silicone sealant, because a greater pushing force is required to concentrate on the rear end of the adhesive, if the pusher head with the soft rubber flange is continued to be used, the soft rubber flange is prone to excessive deformation, tearing, or excessive friction with the tube wall under great pressure, making it difficult to push or even damaged. Therefore, the operator usually needs to remove the pusher head and only keep the single metal pusher head for pushing. However, when this metal pusher head is installed with the pusher head, in order to ensure smooth assembly and avoid interference, its diameter is designed to be slightly smaller than the inner diameter of the glue tube, that is, a certain gap margin is reserved. When using this small-diameter metal pusher alone to push rigid silicone sealant, the sealant under high pressure is easily squeezed out in the opposite direction from the gap between the pusher edge and the inner wall of the tube, causing serious sealant leakage. This not only wastes sealant and contaminates equipment and the working environment, but also seriously affects dispensing efficiency and quality. Secondly, this design suffers from insufficient stability, easily leading to tilting and sealant leakage. Whether pushing structural adhesive or silicone sealant, the current solution relies solely on a single metal pusher as the main load-bearing base. Under the enormous axial pressure transmitted by the pusher, especially when the sealant resistance is uneven or the operating angle is slightly off, the single pusher and its supporting structure are prone to tilting due to uneven stress. This tilting causes the pusher head to not evenly adhere to the tube wall when dispensing structural adhesive, creating gaps in certain areas that lead to leakage of soft structural adhesive; when dispensing silicone sealant, it further widens the already small gap between the metal pusher and the tube wall, making it even easier for rigid silicone sealant to leak in large quantities. Therefore, insufficient pusher stability is the root cause of the tilting and sealant leakage problem, and the above problems are prevalent in both working conditions.

[0005] In summary, existing glue gun pusher designs suffer from two major drawbacks: poor adaptability leading to inconvenient operation and glue leakage under certain working conditions; and low stability and strength causing glue leakage when tilted. These shortcomings severely restrict glue dispensing efficiency, material utilization, and the cleanliness of the working environment. Therefore, this application provides a pusher for glue guns to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a pusher for a glue gun, which solves the problems of poor adaptability of existing pushers leading to inconvenient operation and glue leakage under certain working conditions, as well as low stability leading to glue leakage when tilted.

[0007] To solve the above-mentioned technical problems, this utility model provides a pusher for a glue gun, including a push rod provided on the glue gun, a threaded rod extending coaxially at the end of the push rod, a front bolt and a rear bolt respectively provided at both ends of the threaded rod, and a pusher assembly provided on the threaded rod between the front bolt and the rear bolt.

[0008] The pusher assembly includes, in sequence along the pushing direction of the push rod, a first pusher, a second pusher, and a pusher head;

[0009] Both the first pusher and the second pusher are concave structures with a flat bottom. Both have through holes along the central axis to fit the threaded rod and have circular push edges. The diameter of the first pusher is larger than that of the second pusher and is adapted to the inner diameter of the hose.

[0010] The pusher body is hemispherical, with a soft rubber flange on its circumferential edge for abutting against the inner wall of the hose. The pusher has a threaded hole along its central axis to fit the threaded rod, and a bolt groove to accommodate the bolt is opened at the rear end of the threaded hole.

[0011] A further improvement of this utility model is that the push rod and the threaded rod are integrally set, the diameter of the threaded rod is smaller than the diameter of the push rod, and a stepped structure is formed at the junction of the two to restrict the forward movement of the front bolt.

[0012] A further improvement of this utility model is that the bottom plane of the first pusher plate abuts against the bottom plane of the second pusher plate.

[0013] A further improvement of this utility model is that the front bolt is set in the groove of the first push plate, and the rear bolt is set in the bolt groove.

[0014] A further improvement of this utility model is that the first pusher and the second pusher are made of metal, and the soft-covered rubber flange is made of elastic rubber.

[0015] A further improvement of this utility model is that the diameter of the first pusher is 3-6 mm larger than the diameter of the second pusher.

[0016] A pusher for a glue gun includes a push rod disposed on the glue gun, a threaded rod extending coaxially at the inner end of the push rod, a front bolt and a rear bolt disposed at both ends of the threaded rod, and a pusher assembly disposed on the threaded rod between the front bolt and the rear bolt.

[0017] The pusher assembly includes a second pusher and a first pusher in sequence along the pushing direction of the pusher rod;

[0018] Both the second pusher and the first pusher are concave structures with a flat bottom. Both have through holes along their central axis to accommodate the threaded rod and circular push edges. The diameter of the first pusher is larger than that of the second pusher and is adapted to the inner diameter of the hose. The circular push edges of the first pusher and the second pusher abut against each other. The rear bolt abuts against and is confined within the groove of the first pusher, and the front bolt abuts against and is confined within the bottom plane of the second pusher.

[0019] A further improvement of this utility model is that the thickness of the first pusher and the second pusher is at least 0.1 mm.

[0020] By adopting the above technical solution, this utility model has the following beneficial effects:

[0021] 1. This utility model provides a pusher for a glue gun, which achieves efficient switching and enhanced sealing between structural adhesive and glass glue modes through a dual pusher sequence adjustable structural design. In structural adhesive mode, a three-layer combination of a first pusher, a second pusher, and a pusher head is used. The diameter of the first pusher is adapted to the inner diameter of the glue tube to form an auxiliary sealing ring, and the second pusher enhances the supporting rigidity. Together with the soft-covered edge of the pusher head, they form a double leak-proof barrier. In glass glue mode, the pusher head is removed and the first pusher is adjusted to the front end. Its full diameter fits against the tube wall to completely eliminate glue leakage gaps. Only the pusher sequence needs to be changed to be compatible with both types of glue operations, and the operating efficiency is far superior to the traditional pusher head disassembly and assembly solution.

[0022] 2. This utility model provides a pusher for a glue gun, which doubles the anti-tilting stability through the diameter gradient difference between the first and second pushers and the mutually abutting structure of the circular pusher edges. The diameter of the first pusher is 3-6mm larger than that of the second pusher, ensuring rigid sealing without leakage under glass glue conditions; after the two pushers are ordered, the circular pusher edges are tightly abutted to form a distributed force-bearing surface, which greatly enhances the axial stiffness of the component, effectively resists tilting caused by high thrust or off-center load, and eradicates the defect of single-sided glue leakage caused by instability of traditional single pushers.

[0023] 3. This utility model provides a pusher for a glue gun, which establishes a rigid assembly system to prevent movement by limiting the front bolt with a stepped push rod and locking the rear bolt with a bolt groove. The junction of the stepped push rod prevents the front bolt from moving forward, and the depth of the bolt groove limits the rear bolt from moving backward, forming a two-way mechanical locking. Combined with the continuous load-bearing platform formed by the complete contact of the bottom planes of the first and second pushers, it ensures that the load is evenly transmitted to the pusher head, avoiding sealing failure caused by local stress concentration.

[0024] 4. This utility model provides a pusher for a glue gun, which optimizes the glue delivery efficiency and lifespan through a division of labor mechanism between the rigid bearing of the metal pusher and the elastic sealing of the soft adhesive. The first and second pushers, made of metal, provide a high-strength thrust support surface for the rigid glass glue, eliminating energy loss; the soft adhesive of the pusher head adapts to the deformation of the tube wall to maintain the dynamic sealing of the structural glue, and the specialization of material functions significantly extends the service life of the components.

[0025] 5. This utility model provides a pusher for a glue gun, which achieves self-balancing and stable assembly of the pusher assembly through a symmetrical combination of two pushers and a two-way bolt clamping design. Whether in the mirror support of the two pushers in structural glue mode or the mutual abutment of the pushers in glass glue mode, an axisymmetric force transmission structure is formed; with the front and rear bolts pressing against the outermost plane, the thrust is strictly transmitted along the central axis, completely eliminating the deflection torque caused by the asymmetrical force of the traditional single pusher, and eradicating the problem of glue leakage due to tilting. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the glue gun as a whole;

[0028] Figure 2 A cross-sectional view of a pusher for a glue gun.

[0029] Figure 3 This is a schematic diagram of the structure of the first pusher of this utility model;

[0030] Figure 4 This is a schematic diagram of the pusher head of this utility model;

[0031] Figure 5 This is a schematic diagram of the threaded rod of this utility model;

[0032] Figure 6 This is a schematic diagram of the pusher assembly in Embodiment 1 of this utility model;

[0033] Figure 7 for Figure 6 Side view;

[0034] Figure 8 for Figure 7 A sectional view;

[0035] Figure 9This is a schematic diagram of the pusher assembly in Embodiment 2 of this utility model;

[0036] Figure 10 This is a cross-sectional view of the pusher assembly in Embodiment 2 of this utility model.

[0037] Reference numerals: 1. Glue gun; 2. Push rod; 3. Threaded rod; 4. Front bolt; 5. Rear bolt; 6. Push plate assembly; 61. First push plate; 62. Second push plate; 63. Push head; 64. Through hole; 65. Push edge; 66. Soft adhesive flange; 67. Threaded hole; 68. Bolt groove. Detailed Implementation

[0038] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical 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.

[0041] The present invention will be further explained below with reference to specific embodiments.

[0042] Example 1

[0043] like Figures 1-8As shown, this embodiment provides a pusher for a glue gun, including a push rod 2 on the glue gun 1, which serves as the main power transmission shaft to deliver thrust to the pusher assembly 6; a threaded rod 3 extending coaxially from the inner end of the push rod 2, the diameter of which is smaller than that of the push rod 2 to form a stepped limiting structure; a front bolt 4 and a rear bolt 5 are respectively provided at both ends of the threaded rod 3, the front bolt 4 is used to block the assembly from moving forward, and the rear bolt 5 restricts the assembly from moving backward, forming a two-way mechanical locking; the pusher assembly 6 is provided on the threaded rod 3 between the front bolt 4 and the rear bolt 5 to realize the core function of directional glue propulsion; the pusher assembly 6 includes a first pusher 61, a second pusher 62 and a pusher head 63 in sequence along the pushing direction of the push rod 2; wherein the diameter of the first pusher 61 is adapted to the inner diameter of the glue tube to form an auxiliary sealing ring to cooperate in preventing leakage, and the diameter of the second pusher 62 is smaller to reduce assembly stress; both the first pusher 61 and the second pusher 62 are bottom The planar concave structure ensures sufficient contact and load dispersion. Through holes 64 along the central axis of both pushers are adapted to the threaded rod 3 to ensure coaxial advancement accuracy. Circular push edges 65 reduce frictional resistance and guide colloid flow. The diameter of the first pusher 61 is 3-6 mm larger than that of the second pusher 62 and precisely matches the inner diameter of the tubing. This gradient design balances sealing performance and assembly smoothness. The pusher head 63 has a hemispherical body that optimizes the colloid extrusion channel. Its circumferential edge features a soft rubber flange 66 for abutting against the inner wall of the tubing. The elastic rubber material adapts to the deformation of the tubing wall to achieve dynamic primary sealing and prevent soft rubber backflow. A threaded hole 67 along the central axis of the pusher head 63, adapted to the threaded rod 3, ensures centered force transmission. A bolt groove 68 at the rear end of the threaded hole 67 accommodates the head of the rear bolt 5. The rear bolt 5, in conjunction with the two pushers, forms a triple anti-slip structure with the pusher head 63.

[0044] like Figures 2-8 As shown, in this embodiment, the push rod 2 and the threaded rod 3 are integrally set to enhance the overall rigidity. The diameter of the threaded rod 3 is smaller than the diameter of the push rod 2. The junction of the two forms a stepped structure to mechanically block the forward movement of the front bolt 4, completely eliminating the risk of loosening. The bottom plane of the first push plate 61 and the bottom plane of the second push plate 62 abut against each other, forming a continuous load-bearing platform to evenly distribute the thrust and avoid local overload damage to the soft-covered rubber flange 66. The front bolt 4 is set in the groove of the first push plate 61 to provide positive top thrust, and the rear bolt 5 is set in the bolt groove 68 to form a reverse constraint force. The bidirectional locking mechanism enables the component to withstand high-pressure propulsion. The first push plate 61 and the second push plate 62 are made of metal to provide a high-strength support base. The metal material is preferably stainless steel or aluminum alloy. The soft-covered rubber flange 66 is made of elastic rubber, preferably nitrile rubber, to give full play to the advantages of flexible sealing. The rigidity and flexibility work together to improve the stability of the structural adhesive under working conditions. The diameter of the first push plate 61 is 3-6 mm larger than the diameter of the second push plate 62. Experiments have verified that this range can balance the sealing strength and the smoothness of switching.

[0045] Example 2

[0046] like Figures 1-3 , Figure 5 , Figures 9-10 As shown, in this embodiment, when switching to glass glue application, a pusher for a glue gun includes a push rod 2 mounted on the glue gun 1. The inner end of the push rod 2 is provided with a threaded rod 3 extending coaxially. A front bolt 4 and a rear bolt 5 are respectively mounted at both ends of the threaded rod 3. A pusher assembly 6 is mounted on the threaded rod 3 between the front bolt 4 and the rear bolt 5. The pusher assembly 6 includes a second pusher 62 and a first pusher 61 sequentially along the pushing direction of the push rod 2. The first pusher 61 is positioned rearward to function as a full-diameter sealing core. Both the second pusher 62 and the first pusher 61 are concave structures with a flat bottom, and both have matching threaded rods along their central axis. The through hole 64 of the 3 maintains coaxial accuracy and has a circular push edge 65 on the edge; the diameter of the first push plate 61 is 3-6mm larger than the diameter of the second push plate 62 and perfectly matches the inner diameter of the tube, and the zero gap design eliminates the stubborn problem of hard glue leakage; the circular push edge 65 of the first push plate 61 and the circular push edge 65 of the second push plate 62 abut against each other in sequence to form an axisymmetric support ring to offset the off-center load moment and prevent tilting glue leakage; the rear bolt 5 abuts against and is limited in the groove of the first push plate 61 to provide the main bearing pressure, and the front bolt 4 abuts against and is limited in the bottom plane of the second push plate 62 to build a reverse constraint, and the bidirectional compression ensures no vibration displacement under high thrust.

[0047] This utility model also provides a working principle for the pusher plate used in glue guns:

[0048] When applying structural adhesive, the pusher assembly 6 is assembled into a structure consisting of a first pusher 61, a second pusher 62, and a pusher head 63 arranged sequentially along the pushing direction of the pusher rod 2. First, the front bolt 4 is screwed into the front end of the threaded rod 3 and tightened. Then, the first pusher 61 is fitted onto the threaded rod 3 with its concave bottom facing forward, and its diameter is adapted to the inner diameter of the adhesive tube to form an auxiliary sealing ring. Next, the second pusher 62 is installed so that its bottom plane is completely in contact with the plane of the first pusher 61, forming a continuous load-bearing platform. Finally, the pusher head 63 is installed with its soft-covered adhesive flange 66 facing forward, and the rear bolt 5 is screwed into the end of the threaded rod 3 and embedded in the bolt groove 68 for locking. At this time, the two pushers and the pusher head 63 are tightened by bidirectional bolts to form a triple leak-proof structure.

[0049] When switching to silicone sealant application, remove the pusher head 63 and reverse the order of the two pushers so that the second pusher 62 is in front and the first pusher 61 is behind, ensuring that the pushing edge 65 of the first pusher 61 and the pushing edge 65 of the second pusher 62 are in close contact to form a self-stabilizing ring. Then tighten the rear bolt 5 to press the first pusher 61 into the groove. At this time, the entire diameter edge of the first pusher 61 is in close contact with the inner wall of the tube with zero gap, achieving rigid sealing and propulsion.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the 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 therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pusher for a glue gun, characterized in that, The device includes a push rod (2) installed inside the glue gun (1), a threaded rod (3) extending coaxially at the end of the push rod (2), a front bolt (4) and a rear bolt (5) installed at both ends of the threaded rod (3), and a push plate assembly (6) installed on the threaded rod (3) between the front bolt (4) and the rear bolt (5). The pusher assembly (6) includes, in sequence, a first pusher (61), a second pusher (62), and a pusher head (63) along the pushing direction of the pusher (2); The first push plate (61) and the second push plate (62) are both concave structures with a flat bottom. Both have through holes (64) adapted to the threaded rod (3) along the central axis and circular push edges (65) are provided on the edges. The diameter of the first push plate (61) is larger than the diameter of the second push plate (62) and is adapted to the inner diameter of the hose. The pusher (63) body is hemispherical, and its circumferential edge is provided with a soft rubber flange (66) for abutting against the inner wall of the tube. The pusher (63) has a threaded hole (67) adapted to the threaded rod (3) along the central axis. The top of the threaded hole (67) has a bolt groove (68) for accommodating the bolt (5).

2. The pusher for a glue gun according to claim 1, characterized in that, The push rod (2) and the threaded rod (3) are integrated. The diameter of the threaded rod (3) is smaller than that of the push rod (2). At the junction of the two, a stepped structure is formed to restrict the forward movement of the front bolt (4).

3. The pusher for a glue gun according to claim 1, characterized in that, The bottom plane of the first pusher (61) abuts against the bottom plane of the second pusher (62).

4. The pusher for a glue gun (1) according to claim 1, characterized in that, The front bolt (4) is located in the groove of the first push plate (61), and the rear bolt (5) is located in the bolt groove (68).

5. A pusher for a glue gun according to claim 1, characterized in that, The first pusher piece (61) and the second pusher piece (62) are made of metal, and the soft-coated edge (66) is made of elastic rubber.

6. A pusher for a glue gun according to claim 1, characterized in that, The diameter of the first pusher (61) is 3-6 mm larger than the diameter of the second pusher (62).

7. A pusher for a glue gun, characterized in that, The device includes a push rod (2) on a glue gun (1), a threaded rod (3) extending coaxially at the end of the push rod (2), a front bolt (4) and a rear bolt (5) at the two ends of the threaded rod (3), and a push plate assembly (6) on the threaded rod (3) between the front bolt (4) and the rear bolt (5). The pusher assembly (6) includes a second pusher (62) and a first pusher (61) in sequence along the pushing direction of the pusher (2); Both the second push plate (62) and the first push plate (61) are concave structures with a flat bottom. Both have through holes (64) along the central axis to accommodate the threaded rod (3) and circular push edges (65) on their edges. The diameter of the first push plate (61) is larger than that of the second push plate (62) and is adapted to the inner diameter of the hose. The circular push edges (65) of the first push plate (61) and the circular push edges (65) of the second push plate (62) abut against each other. The rear bolt (5) abuts against and is confined in the groove of the first push plate (61), and the front bolt (4) abuts against and is confined in the bottom plane of the second push plate (62).

8. A pusher for a glue gun according to claim 1 or 7, characterized in that, The thickness of the first pusher (61) and the second pusher (62) is at least 0.1 mm.

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