TWI829196B - hot melt glue gun - Google Patents

Abstract

A hot melt glue gun includes a hot melt mechanism and a discharging mechanism installed on the gun body mechanism. The heating cavity of the hot melt mechanism includes a receiving cavity for inserting the glue strip, a glue discharging cavity that is not coaxial with the receiving cavity, and a connecting tube connecting the receiving cavity and the glue discharging cavity. department. The discharging mechanism is installed in the glue outlet cavity and can be driven to change from a closed position closing the glue outlet to an open position separated from the glue outlet. Through the structural design of the hot melt mechanism and the discharging mechanism, the hot melt glue gun of the present invention can have a high glue dispensing amount without leakage of residual glue. It is a quite innovative, convenient and practical creation.

Description

hot melt glue gun

The present invention relates to an adhesive coating tool, in particular to a hot melt glue gun that melts and releases adhesive strips.

A hot melt glue gun is a common art tool that can heat solid adhesive strips through an internal heating cavity to produce molten glue, and release the molten glue for coating and bonding objects. For example, the hot melt glue disclosed in Chinese patent CN213194403U gun. When you want the hot melt glue gun to release melt glue, you can pull the trigger of the hot melt glue gun to push the glue strip forward into the heating cavity and force the melt glue in the heating cavity to move forward. Push the ball valve used to close the glue outlet hole, so that the melt flows forward from the gap between the ball valve and the inner wall of the heating chamber. However, the structural design of this hot melt glue gun has the following shortcomings. (1) When melt glue is to be released, the amount of glue output is small because the gap between the ball valve and the inner wall of the heating cavity is narrow. (2) When the ball valve closes the glue outlet, there is usually a space between the ball valve and the opening of the front end of the glue outlet. Therefore, even though the ball valve has closed the front end of the glue outlet, the melt remaining in the space will still remain. Continuing to flow out will cause trouble and inconvenience in use. (3) If the heating cavity has not been heated to the predetermined temperature, the glue originally solidified inside it will When the body melts, pressing the trigger may easily cause damage to the internal transmission mechanism.

Therefore, it is an object of the present invention to provide a hot melt glue gun that can improve at least one of the shortcomings of the prior art.

Therefore, the hot melt glue gun of the present invention is suitable for use with a glue strip. The hot melt glue gun includes a gun body mechanism, a hot melt mechanism and a discharging mechanism installed on the gun body mechanism.

The gun body mechanism has a feeding ring for forward insertion of the rubber strip, and the gun body mechanism is operable to gradually move the rubber strip forward into its interior using the feeding ring. The hot-melt mechanism can be used to receive the rubber strip moved forward by the feed ring, and includes a heating cavity that can be heated by electricity, and the front end of the rubber strip inserted forward is heated and melted to generate melt. The heating cavity includes a receiving cavity that extends axially forward and backward and is used for inserting the front end of the rubber strip, a glue outlet cavity that extends axially front and back and is not axial with the receiving cavity, and a glue outlet connected to the receiving cavity. The communication tube portion between the cavity portion and the glue outlet cavity portion has a glue outlet exposed outside the gun body mechanism and can be used to release molten glue forward. The discharging mechanism is installed in the glue outlet cavity and can be driven to change from a closed position closing the glue outlet to an open position separated from the glue outlet.

The effect of the present invention is that through the structural design of the hot-melt mechanism and the discharging mechanism, the hot-melt glue gun of the present invention can have a higher glue output without leakage of residual glue. It is a quite innovative and convenient method. Practical creations.

200:Hot melt glue gun

3: Gun body mechanism

31: Shell body

310: Feed hole

311: Guidance Department

312: Guidance Department

32: Feeding ring

33: Trigger unit

331: Operating parts

332: Transmission components

4: Hot melt mechanism

41: Heating cavity

411: Take over the cavity

412: Glue outlet cavity

413:Rear cavity section

414: Glue discharging section

415:Glue outlet

416:Connecting pipe department

417: First communication port

418: Second connection port

42:Guide convex body

421:Guide slope

43: Anti-return pipe body

431: Pipe body part

432: Anti-return ring part

5: Discharging mechanism

51: Valve parts

511:Piston part

512: Needle valve department

513: Interaction Department

52: Elastic parts

53: Traction unit

531:traction rope

532: Buffer

54: switch parts

541:Sliding hole

542: Positioning hole

900: Adhesive strip

901: Melt glue

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a side cross-sectional view illustrating the structure of a first embodiment of the hot melt glue gun of the present invention and illustrating a valve. The situation when the valve member is in a closed position; Figure 2 is an incomplete side cross-sectional view illustrating the situation when a feed ring of the first embodiment is driven to push the rubber strip forward, and the valve member is in an open position. ; Figure 3 is an incomplete side cross-sectional view, illustrating the structure of a second embodiment of the hot melt glue gun of the present invention, and illustrating a switch member in a release position, and a valve member in a closed position; and FIG. 4 is an incomplete side cross-sectional view illustrating the situation when the switch member of the second embodiment is operated to change to a pulling position and drives the valve member to change to an open position.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are designated with the same numbering.

Referring to Figures 1 and 2, a first embodiment of the hot melt glue gun 200 of the present invention is suitable for inserting a glue strip 900, and can be used to insert the glue strip 900 forward. The bit is heated to become molten glue 901, and the generated molten glue 901 is released forward. The hot melt glue gun 200 includes a gun body mechanism 3, a hot melt mechanism 4 and a discharging mechanism 5 installed in the gun body mechanism 3.

The gun body mechanism 3 includes a shell body 31, a feed ring 32 that is displaceable forward and backward and axially disposed in the shell body 31, and a trigger that is installed in the shell body 31 and connected to the feed ring 32. Unit 33. The shell body 31 has a feed hole 310 for forward insertion of the rubber strip 900, and has a left and right guide portion 311 axially spaced above the outer peripheral side of the feed ring 32. The feeding ring 32 allows the rubber strip 900 passing through the feeding hole 310 to pass forward, so that the rubber strip 900 can be inserted forward into the hot melt mechanism 4 .

The trigger unit 33 has an operating member 331 pivoted on the housing body 31 and exposed outside the housing body 31 , and a transmission assembly 332 connected between the operating member 331 and the feed ring 32 . When the operating member 331 is pressed and moved toward the shell body 31 , the transmission component 332 is driven to drive the feed ring 32 to deflect relative to the rubber strip 900 , causing the feed ring 32 to block the rubber strip 900 . And at the same time, the feed ring 32 is driven to move forward relative to the shell body 31, and the feed ring 32 is driven to drive the rubber strip 900 to move forward for a certain distance. When the operating member 331 is released, the transmission assembly 332 will drive the operating member 331 to pivot and return, and drive the feed ring 32 to rotate forward so that the rubber strip 900 is no longer stuck, and drive the feed ring 32 to move relative to the rubber strip 900 . The rubber strip 900 and the shell body 31 are moved backward and reset. By repeatedly operating the operating member 331, the adhesive strip 900 can be pushed forward section by section into the hot melt mechanism. 4. Since the trigger unit 33 can be operated to drive the feed ring 32 to forward the rubber strip 900 section by section, it is an existing technology with numerous structural designs, and is not the focus of improvement of the present invention. Therefore, it will not be described in detail, and it will not be implemented during implementation. Limited to graphic format.

The hot melt mechanism 4 includes a heating cavity 41 disposed in the shell body 31, a guide protrusion 42 disposed in the heating cavity 41, and a guide protrusion 42 disposed between the heating cavity 41 and the feed ring. 32-bay anti-return pipe body 43.

The heating cavity 41 can be heated by electricity, thereby melting the received adhesive strip 900 into molten glue 901, and releasing the generated molten glue 901 forward for use. The heating cavity 41 has a receiving cavity 411 that extends axially forward and backward and opens toward the rear, and a glue discharging cavity that extends axially forward and backward and is spaced non-axially from the receiving cavity 411 above the receiving cavity 411 . 412, and a communication tube portion 416 extending up and down to communicate between the receiving cavity portion 411 and the glue discharging cavity portion 412.

The receiving cavity 411 allows the rubber strip 900 passing forward through the non-return tube body 43 to be inserted forward, and the front end of the rubber strip 900 can be heated and melted into molten glue 901 . The glue outlet portion 412 has a rear cavity section 413 extending front and back, and a glue outlet section 414 coaxially extending forward from the rear cavity section 413 and passing out of the shell body 31 . The rear cavity sections 413 are arranged in parallel above the receiving cavity 411 at intervals. The front end wall of the glue outlet section 414 has a glue outlet 415 that penetrates from front to back and is used to release the melt glue 901 forward. The communication tube portion 416 has a first communication port 417 radially connected to the top side of the front end of the receiving cavity portion 411 , and a first communication port 417 radially connected to the bottom side of the connection between the rear cavity section 413 and the glue outlet section 414 . Second connecting port 418, which can be used to guide the melt 901 of the receiving cavity 411 upward and inject it into the glue outlet cavity 412.

The guide protrusion 42 is protrudingly disposed on the bottom side of the inner peripheral surface of the front end section of the receiving cavity 411 and is located below the first communication opening 417 and has an upward facing first communication opening 417. And the guide slope 421 extends obliquely from back to front and is close to the first communication port 417 . The guide protrusion 42 can use the guide slope 421 to guide the forward-flowing melt 901 upward into the first communication port 417 .

The non-return pipe body 43 has a pipe body part 431 extending forward and backward and coaxially sleeved on the rear end of the receiving cavity part 411, and two non-return rings spaced back and forth and radially protruding from the inner circumferential surface of the pipe body part 431. Department 432. The inner diameter of the anti-return ring portions 432 is approximately equal to the outer diameter of the rubber strip 900, and can be used to be airtightly placed outside the rubber strip 900 that passes forward.

The discharging mechanism 5 includes a valve member 51 displaceably disposed in the glue discharging cavity 412, a front and rear elastic member 52 disposed between the glue discharging cavity 412 and the valve member 51, and A traction unit 53 is elastically connected between the valve member 51 and the feed ring 32 .

The valve member 51 has a piston part 511 with an airtight plug that can move forward and backward and is installed in the rear cavity section 413. The glue outlet 415 has a rod-shaped needle valve portion 512 and a rod-shaped linking portion 513 that extends rearwardly from the piston portion 511 and can move forward and backward through the rear cavity section 413 . The outer diameter of the needle valve part 512 is smaller than the inner diameter of the glue discharging section 414. Completely seal the glue outlet 415 with its front end portion forward.

The valve member 51 can be driven to shift forward and backward between a closed position and an open position relative to the glue discharging cavity 412 . When the valve member 51 is displaced to the closed position, the needle valve part 512 will close the glue outlet 415. When it is in the open position, it will move backward relative to the glue outlet cavity part 412, so that the needle valve part 512 Move backward away from the glue outlet 415. The elastic member 52 is a compression spring extending forward and backward. The front and rear elastic supports are arranged between the rear side of the piston part 511 and the rear end of the rear cavity section 413, and always have elastic force to drive the valve member 51 to change to the closed position.

The traction unit 53 includes a buffer member 532 disposed behind the glue discharging cavity 412 and connected to the rear end of the linking part 513 , and a traction rope 531 connected between the buffer member 532 and the feed ring 32 . The buffer member 532 is a tension spring that can be elastically stretched forward and backward, and the elastic coefficient of the buffer member 532 is greater than the elastic coefficient of the elastic member 52 . The traction rope 531 extends backward from the buffer member 532 and winds around the guide portion 311 of the shell body 31 , and then extends forward to be connected to the feed ring 32 .

When using the hot melt glue gun 200 of the present invention, insert the glue strip 900 forward into the shell body 31, pass forward through the feed ring 32 and the check tube body 43, and insert it into the receiving cavity of the heating cavity 41. Department 411. When the hot melt glue gun 200 is powered on, the heating cavity 41 will heat up to melt the solidified colloid that originally exists inside, and will also melt the front end of the glue strip 900 inserted forward.

When the colloid and the rubber strip 900 in the heating cavity 41 have melted and become molten glue, 901, the operating member 331 of the trigger unit 33 can be operated to drive the feed ring 32 to push the rubber strip 900 forward into the receiving cavity 411. At the same time, the feed ring 32 will move forward. Pull the traction rope 531 forward, the traction rope 531 will pull the valve member 51 backward through the buffer member 532, and drive the valve member 51 to change from the closed position to the open position, and the needle valve portion 512 will completely Get away from the glue outlet 415. During the operation of the feed ring 32 and the valve member 51, the rubber strip 900 will push forward the melt 901 in the receiving cavity 411, and the guide protrusion 42 will push the forward flowing melt 901 toward The upper guide flow is directed to the first communication port 417, and is injected upward into the glue outlet cavity 412 through the communication tube portion 416, and flows forward through the glue outlet 415 of the glue outlet section 414. In addition, the elastic member 52 will be elastically compressed backward by the valve member 51 to accumulate a restoring elastic force.

When the operating member 331 is released, the returning elastic force of the elastic member 52 will drive the valve member 51 to move forward and return to the closed position, thereby closing the glue outlet 415 again. The valve member 51 will drive the feed ring 32 to move backward relative to the rubber strip 900 through the traction unit 53 , so that the feed ring 32 can be driven by the trigger unit 33 to push the rubber strip 900 forward again.

When the valve member 51 is in the closed position, the needle valve part 512 will seal the entire glue outlet 415, and when it is in the open position, it will completely break away from the structural design of the glue outlet 415, in addition to greatly improving the glue outlet. In addition, it can also improve the problem of residual glue leakage.

Furthermore, through the structural device of the traction unit 53 having the buffer member 532 If the user forcefully pulls the trigger unit 33 before the internal colloid and the rubber strip 900 of the heating chamber 41 are completely melted, the buffer member 532 can be elastically stretched through the elastic buffering function. , so that the trigger unit 33 can still be operated to drive the feed ring 32 to move, which will force the feed ring 32 to move forward relative to the rubber strip 900, so it is not easy to cause the colloid resistance in the heating cavity 41 to be too large. The trigger unit 33 was forced to operate and was damaged.

During implementation, in another embodiment of the present invention, the traction unit 53 may not be provided with the buffer member 532 , and the traction rope 531 may be directly connected between the linkage portion 513 of the valve member 51 and the feed ring 32 .

Referring to Figures 3 and 4, the difference between a second embodiment of the hot melt glue gun 200 of the present invention and the first embodiment lies in: the structural design of the discharging mechanism 5, and the discharging mechanism 5 and the gun body mechanism 3 connections between. For convenience of explanation, only the differences between the embodiments will be described below.

In the second embodiment, the discharging mechanism 5 is not connected to the feed ring 32 and includes the valve member 51, the elastic member 52, the traction unit 53, and a sleeve that can pivot up and down and move forward and backward. The guide portion 311 extends back out of the switch member 54 outside the housing body 31 .

The front end of the switch member 54 is connected to the rear end of the traction rope 531, and has a sliding hole 541 extending forward and backward for the guide part 311 to be displaceable forward and backward, and a front end connected to the top side of the sliding hole 541. Positioning hole 542. Switching element 54 is available for operation The guide portion 311 pivots up and down between a release position and a pulling position.

When the switch member 54 is in the release position, the sliding hole 541 extends horizontally forward and backward, and the switch member 54 will be elastically pulled forward by the traction rope 531, and the sliding hole 541 will be pulled forward by the sliding hole 541. The end edge is used for the guide portion 311 to lean back and limit. At this time, the valve member 51 will be in the closed position closing the glue outlet 415 .

When the valve member 51 is to be driven to the open position so that the gun body mechanism 3 can be operated to release melt through the hot melt mechanism 4, the switch member can be moved downward relative to the shell body 31. 54, driving the switch member 54 to change from the release position to the pulling position.

When the switch member 54 is operated to pivot downward and move backward relative to the guide portion 311, the guide portion 311 will move obliquely upward toward the positioning hole 542 along the sliding hole 541. Here, During this period, the switch member 54 will pull the traction rope 531 backward, driving the elastic member 52 and the buffer member 532 to deform to accumulate reset elastic force, and drive the valve member 51 to move to the open position. When the guide portion 311 is relatively displaced to the top of the sliding hole 541 and aligned with the positioning hole 542, the restoring elastic force of the elastic member 52 and the buffer member 532 will drive the traction rope 531 to pull the switch member 54 forward. , so that the guide portion 311 is inserted into the positioning hole 542 relatively backward. At this time, the switch member 54 has been detachably positioned at the pulling position, and the valve member 51 has also been pulled backward by the pulling unit 53 to change to the open position.

In the second embodiment, the positioning hole 542 of the switch member 54 is provided with On the top side of the front end of the sliding hole 541 , the switch member 54 can be rotated downward to the pulling position so that the guide portion 311 is rearwardly embedded in the positioning hole 542 . However, during implementation, in another embodiment of the present invention, the positioning hole 542 can also be provided at the bottom side of the front end of the sliding hole 541 so that the switch member 54 can be turned upward to adjust to the pulling position. .

In summary, through the structural design of the hot melt mechanism 4 and the discharging mechanism 5, the hot melt glue gun 200 of the present invention can have a higher glue output, and after the trigger unit 33 is released, the valve member 51 can completely seal the glue outlet 415 without leakage of residual glue. In addition, the traction unit 53 interlockingly provided between the valve member 51 and the feed ring 32 can be designed to be elastically stretched, which can effectively improve the ease of existing hot melt glue guns because the colloid in the heating cavity 41 has not yet heated up. If the trigger unit 33 is melted, the trigger unit 33 will be forced to operate, causing a malfunction problem. Therefore, the hot melt glue gun 200 of the present invention is indeed a very innovative, convenient and practical creation, and can indeed achieve the purpose of the present invention.

However, the above are only examples of the present invention. They cannot be used to limit the scope of the present invention. All simple equivalent changes and modifications made based on the patent scope of the present invention and the contents of the patent specification are still within the scope of the present invention. within the scope covered by the patent of this invention.

200: Hot melt glue gun 3: Gun body mechanism 31: Shell body 311: Guidance Department 32: Feeding ring 33: Trigger unit 331: Operating parts 332: Transmission components 4: Hot melt mechanism 41: Heating cavity 411: Taking over the cavity 412: Glue outlet cavity 413: Rear cavity section 414: Glue discharging section 415: Glue outlet 416: Connecting Pipe Department 417: First communication port 418: Second communication port 42: Guide convex body 421: Guide slope 43: Anti-return pipe body 431: Pipe body part 432: Anti-return ring part 5: Discharging mechanism 51: Valve parts 511: Piston Department 512: Needle valve department 513: Interaction Department 52: Elastic parts 53: Traction unit 531: Traction rope 532: Buffer 900: Adhesive strip 901: Melt glue

Claims (12)

A hot melt glue gun suitable for use with a glue strip, including: A gun body mechanism has a feed ring for forward insertion of the rubber strip, and the gun body mechanism is operable to gradually move the rubber strip forward into its interior using the feed ring; A hot-melt mechanism is installed on the gun body mechanism and can be used to receive the glue strip moved forward by the feed ring. It includes a front end that can be heated by electricity to insert the glue strip forward to generate molten glue. The heating cavity includes a receiving cavity that extends axially forward and backward and is used for inserting the front end of the rubber strip, a glue outlet cavity that extends axially front and back and is non-axial with the receiving cavity, and A connecting pipe part connected between the receiving cavity part and the glue outlet cavity part, the glue outlet cavity part having a glue outlet exposed outside the gun body mechanism and capable of releasing molten glue forward; and A discharging mechanism is installed in the glue outlet cavity and can be driven to change from a closed position closing the glue outlet to an open position separated from the glue outlet. The hot melt glue gun as claimed in claim 1, wherein the discharging mechanism is connected to the feed ring and can be driven by the feed ring that moves the adhesive strip forward to change from the closed position to the open position. . The hot melt glue gun according to claim 2, wherein the discharging mechanism includes a valve disposed in the glue discharging cavity and can be driven to change between the closed position and the open position, a valve disposed in the There is an elastic member between the glue discharging cavity and the valve member that always has the elastic force to drive the valve member to change to the closed position, and a traction unit connected between the valve member and the feed ring. The traction unit can be moved toward The feed ring that moves the glue strip forward is synchronously driven, and the valve member is driven to move backward relative to the glue outlet cavity to change to the open position. The hot melt glue gun according to claim 3, wherein the glue discharging cavity has a rear cavity section and a glue discharging section protruding forward from the gun body mechanism and defining the glue outlet, and the The communication pipe part has a second communication port that is radially connected between the rear cavity section and the glue discharging section. The valve member has a piston part with a front and rear displaceable airtight plug installed in the rear cavity section, and an automatic The piston part extends forward and is inserted into the needle valve part in the glue discharging section, and a linkage part extends back from the piston part out of the rear chamber section and is connected to the traction unit. When the valve member is located in the closed position, the needle valve portion closes the glue outlet. The hot melt glue gun according to claim 4, wherein the gun body mechanism further includes a shell body for the feed ring to be displaceably installed forward and backward, and the shell body has a guide spaced at an outer circumferential side of the feed ring. The traction unit includes a traction rope connected to the rear end of the linkage part, extending backward around the guide part, and extending forward to connect to the feed ring. The hot melt glue gun according to claim 4, wherein the gun body mechanism further includes a shell body for the feed ring to be displaceably installed forward and backward, and the shell body has a guide spaced at an outer circumferential side of the feed ring. The traction unit includes a buffer member connected to the rear end of the linkage part and elastically stretched forward and backward, and a buffer member extending backward from the buffer member and passing through the guide portion and extending forward to connect to the inlet. The traction rope of the material ring. The hot melt glue gun according to claim 1, wherein the discharging mechanism includes a valve disposed in the glue discharging chamber and capable of being driven to change between the closed position and the open position, a valve disposed on the There is an elastic member between the glue discharging cavity and the valve member that always has the elastic force to drive the valve member to change to the closed position. An installation is exposed outside the gun body mechanism and is operable in a pulling position and a releasing position. A switch member that changes between the valve member and the switch member, and a traction unit that extends forward and backward and is connected between the valve member and the switch member. When the switch member is operated and changes from the release position to the pull position, the traction unit will be driven to drive the valve. The component moves backward relative to the glue outlet cavity, thereby driving the valve component to change from the closed position to the open position. The hot melt glue gun as claimed in claim 7, wherein the glue discharging cavity has a rear cavity section and a glue discharging section protruding forward from the gun body mechanism and defining the glue outlet, and the The communication pipe part has a second communication port that is radially connected between the rear cavity section and the glue discharging section. The valve member has a piston part with a front and rear displaceable airtight plug installed in the rear cavity section, and an automatic The piston part extends forward and is inserted into the needle valve part in the glue discharging section, and a linkage part extends back from the piston part out of the rear chamber section and is connected to the traction unit. When the valve member is located in the closed position, the needle valve portion closes the glue outlet. The hot melt glue gun according to claim 8, wherein the gun body mechanism has a left and right axial guide portion spaced behind the glue outlet portion, and the switch member can be in the pull position and the release position. The traction unit is pivoted on the guide part in a variable manner of pivoting up and down between positions. The traction unit includes a traction rope connected to the rear end of the linkage part and extending backward to connect to the switch member. The hot melt glue gun according to claim 8, wherein the gun body mechanism has a left and right axial guide portion spaced behind the glue outlet portion, and the switch member can be in the pull position and the release position. The traction unit includes a buffer member connected to the rear end of the linkage portion and elastically stretched forward and backward, and a buffer member connected to the rear end of the linkage portion and extending backwards. A traction rope extending from the switch member. The hot melt glue gun as claimed in claim 9 or 10, wherein the switch member is connected with its front end to the rear end of the traction rope, and has a front and rear extension for the guide portion to be slidably inserted forward and backward. The sliding hole and a positioning hole connected to one of the top and bottom sides of the front end of the sliding hole. When the switch member is in the release position, it will be elastically pulled forward by the traction rope, and the sliding hole will The rear end edge allows the guide portion to lean back against the limit. When the switch member is operated and changes to the pulling position, it will pivot and move backward relative to the guide portion, so that the guide portion moves along the The sliding hole moves relatively forward to the positioning hole and is elastically pulled forward by the traction rope, and the positioning hole is used for the guide part to be inserted and positioned backward, and is detachably positioned at the pulling position. The hot melt glue gun according to claim 1, wherein the communication tube part has a first communication port radially connected to the front end of the receiving cavity part, and the hot melt mechanism also includes a protruding part protruding from the inner periphery of the receiving cavity part. The guide protrusion has a guide protrusion extending obliquely from back to front towards the first communication port, and can be used to guide the melt pushed forward to the first communication port. guide slope.

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