A concave indentation drawing device for automobile sheet metal

Abstract

The application relates to the technical field of automobile maintenance, in particular to a car sheet metal dent puller which comprises a supporting frame, supporting feet, a welding rod, a handle, a connecting ring, a clamping ring, a sleeve, a retaining ring, a fixed arm, a movable arm, a welding head and a return spring, further comprises a linkage and a rotating wheel, the linkage is provided with a first connecting point used for being movably connected with one end of the movable arm away from a holding part, a second connecting point used for being hingedly connected with the supporting frame and a third connecting point used for being rotatably connected with the rotating wheel, the first connecting point, the second connecting point and the third connecting point are in triangular distribution, the rotating wheel is rotatably connected with the third connecting point of the linkage and abuts against the retaining ring, and the puller is used for repairing the car sheet metal dent, the operator is more comfortable in operation, and the overall service life is longer.

Description

Technical Field

[0001] This invention relates to the field of automotive repair technology, and in particular to an automotive sheet metal dent puller. Background Technology

[0002] When a car's sheet metal is hit or scratched, it will have dents, which auto repair shops will need to repair using a puller.

[0003] Existing pullers (such as the puller involved in Chinese design patent application number 202130127949.9) operate as follows: First, the puller is placed in the repair position, and the clamping ring is adjusted so that the welding head contacts the bottom of the dent; then, the welding clamp is held in place by the connecting ring and the power is turned on, so that the welding head is welded and fixed to the bottom of the dent; after welding, the movable arm is driven to move, and the welding head is lifted by pressing the retaining ring upward by the movable arm, thereby pulling the dent to be flush; finally, the handle is rotated to disengage the welding head from the bottom of the dent, thus completing the repair of a single dent. However, this puller has obvious defects: during the process of the movable arm pressing the retaining ring, because the force given by the movable arm is not vertically upward, there is a large frictional resistance between the two. Not only does it require the operator to apply a large force to drive the movable arm to move, making the user experience laborious, but long-term use can also easily cause serious wear on the movable arm, affecting the service life and performance of the equipment. Summary of the Invention

[0004] The technical solution to be solved by the present invention is to provide an automotive sheet metal dent puller. Using this puller to repair automotive sheet metal dents makes the operation more comfortable for the operator and has a longer overall service life.

[0005] The technical solution adopted in this invention is: an automotive sheet metal dent puller, comprising a support frame, a support foot disposed at the bottom of the support frame, a welding rod vertically sliding on the support frame, a handle disposed at the upper end of the welding rod, a connecting ring disposed on the welding rod and located below the handle for clamping by welding clamps, a clamping ring threadedly connected to the welding rod for adjusting the position of the welding rod, a sleeve sleeved on the welding rod with its upper end abutting against the clamping ring, a retaining ring sleeved on the welding rod and abutting against the lower end of the sleeve, a fixed arm fixed on the support frame, a movable arm rotatably connected to the support frame, a welding head disposed at the lower end of the welding rod, and a return spring sleeved on the welding rod and located between the welding head and the support frame. It also includes a linkage component and a rotating wheel. The linkage component is provided with a first connection point for movably connecting to the end of the movable arm away from the gripping part, a second connection point for hinged connection to the support frame, and a third connection point for rotatably connecting the rotating wheel. The first connection point, the second connection point, and the third connection point are triangularly distributed. The rotating wheel is rotatably connected to the third connection point of the linkage component and abuts against the retaining ring.

[0006] Preferably, the first connection point of the linkage is provided with a rotating shaft, and the end of the movable arm away from the gripping part is provided with a rotating groove for the rotating shaft to rotate and move.

[0007] Preferably, the rotating groove includes a first position, a second position, and a connecting portion that connects the first position and the second position and matches the movement path of the rotating shaft. When no force is applied to the movable arm, the pivot is in the first position; When force is applied to the movable arm, and the movable arm drives the linkage to press the retaining ring against the support frame, the rotating shaft is in the second position.

[0008] Preferably, the linkage is V-shaped, with the first connection point located at one end of the V-shaped linkage, the third connection point located at the other end of the V-shaped linkage, and the second connection point located on the bent portion of the V-shaped linkage.

[0009] Preferably, the support frame includes a support frame and support legs disposed on both sides of the lower end of the support frame, and the support frame and support legs are integrally formed. The support frame includes an upper support, a lower support, a left support and a right support. The second connection point of the linkage is hinged to the left support, and the movable arm is hinged to the right support. Both the upper support and the lower support are provided with through holes for the welding rod to pass through.

[0010] Preferably, there are two linkage components, and the two linkage components are rotatably connected to both sides of the left frame through a rotating shaft. The end of the movable arm away from the gripping part is provided with a groove for the right support to pass through, and the ends of the grooves are respectively movably connected to the two linkage components.

[0011] Preferably, the upper part of both sides of the groove is provided with an arc surface facing the hinge point between the movable arm and the right support.

[0012] Preferably, the fixed arm is located at the lower end of the right support, and the support frame, support leg and fixed arm are integrally formed, with the hinge position of the movable arm and the right support located above the fixed arm.

[0013] Preferably, the horizontal position of the hinge joint between the linkage and the left support is higher than the horizontal position of the hinge joint between the movable arm and the right support.

[0014] Preferably, the right support is provided with a hinge hole for hinged connection of the movable arm. The hinge hole is a waist-shaped hole arranged vertically. The end of the movable arm away from the gripping part is provided with an embedding hole. The puller also includes multiple inserts for embedding into the embedding hole. Each insert is provided with a rotating groove of different shapes.

[0015] Compared with the prior art, the present invention has the following advantages by adopting the above structure: by setting a linkage component, the direction of force transmission can be changed, which can better realize the movement reversal in a narrow space, no longer restricted by the installation position and direction of the movable arm, and the movable arm only needs a small movement to drive the retaining ring welding rod to lift more significantly. In addition, a wheel is set at the contact position between the linkage component and the retaining ring, which can greatly reduce the friction between the linkage component and the retaining ring, making the user operation more comfortable, and the overall service life of the product is also longer. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the puller in Embodiment 1 of the present invention.

[0017] Figure 2 This is a schematic diagram of the movable arm in the puller of Embodiment 1 of the present invention.

[0018] Figure 3 This is a schematic diagram of the linkage component in the puller of Embodiment 1 of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the puller in Embodiment 1 of the present invention after the support frame and the fixed arm are combined.

[0020] Figure 5 This is a schematic diagram of the structure of the puller in Embodiment 2 of the present invention after the support frame and the fixed arm are combined.

[0021] Figure 6 This is a schematic diagram of the movable arm in the puller of Embodiment 2 of the present invention.

[0022] As shown in the figure: 1. Support frame; 2. Support leg; 3. Welding rod; 4. Handle; 5. Connecting ring; 6. Clamping ring; 7. Sleeve; 8. Retaining ring; 9. Fixed arm; 10. Movable arm; 11. Welding head; 12. Return spring; 13. Linkage component; 14. Rotating wheel; 15. First connection point; 16. Second connection point; 17. Third connection point; 18. Rotating shaft; 19. Rotating groove; 20. First position; 21. Second position; 22. Connecting part; 23. Support leg; 24. Upper support; 25. Lower support; 26. Left support; 27. Right support; 28. Rotating shaft; 29. ​​Groove; 30. Arc surface; 31. Through hole; 32. Hinge hole; 33. Insert. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] Example 1: A type of puller, such as Figure 1 As shown, it includes a support frame 1, support feet 2, welding rod 3, handle 4, connecting ring 5, clamping ring 6, sleeve 7, retaining ring 8, fixed arm 9, movable arm 10, welding head 11, return spring 12, linkage component 13, and rotating wheel 14, wherein: Support frame 1, such as Figure 4 As shown, the support frame and support legs 23 are integrally formed. The support frame includes an upper support 24, a lower support 25, a left support 26, and a right support 27. The upper support 24, lower support 25, left support 26, and right support 27 form a rectangular frame. The upper support 24 and lower support 25 are provided with through holes 31, and the through holes 31 on the upper support 24 are larger than those on the lower support 25. This is because the through holes 31 on the upper support 24 need to allow the sleeve 7 to pass through, while the lower support 25 only needs to allow the welding rod 3 to pass through. The left support 26 and right support 27 are both provided with hinge holes 32, and the horizontal position of the hinge holes 32 on the left support 26 is higher than that on the right support 27. The support legs 23 include a left leg and a right leg, which are fixed to the left and right sides of the lower support 25, respectively. The lower part of the right support 27 is narrower than the upper part, which facilitates the installation and rotation of the movable arm 10. The fixed arm 9 is installed on the lower part of the right support 27 and is integrally formed with the support frame and the support leg 23; Support legs 2, there are two of them, which are connected to the lower ends of the left and right legs respectively; The welding rod 3 is a threaded rod that passes through the through holes 31 on the upper support 24 and the lower support 25 in sequence and can slide vertically. The handle 4 is fixed to the top of the welding rod 3 for the user to grip and rotate the welding rod 3. It is T-shaped and made of insulating material. Connecting ring 5 is fixed below handle 4 for clamping by welding pliers; There are two clamping rings 6, both threadedly connected to the welding rod 3. One is located between the upper support 24 and the connecting ring 5, and the other is located between the upper support 24 and the lower support 25. The vertical position of the welding rod 3 can be adjusted by rotating the clamping rings 6. The sleeve 7 is fitted onto the welding rod 3, can slide on the welding rod 3, and is located between the upper support 24 and the lower support 25; The retaining ring 8 is sleeved on the welding rod 3, can slide on the welding rod 3, and is located between the sleeve 7 and the lower support 25; Welding head 11 is fixed to the lower end of welding rod 3 and is used to weld and fix it to the bottom of the dent to be repaired; A spring washer is fitted onto the welding rod 3 and is located between the lower support 25 and the welding head 11; The return spring 12 is sleeved on the welding rod 3 and located between the spring pad and the welding head 11. One end abuts against the spring pad and the other end abuts against the welding head 11, and is used to provide a return force to the welding rod 3. Mobile arm 10, such as Figure 2 As shown, a groove 29 is provided at the end away from the gripping part. The groove 29 of the movable arm 10 can be embedded in the right support 27. The movable arm 10 is hinged to the hinge hole 32 on the right support 27. Rotating grooves 19 are provided on the two side walls of the groove 29. The rotating groove 19 mainly includes a first position 20, a second position 21 and a connecting part 22 connecting the first position 20 and the second position 21. The shapes of the first position 20 and the second position 21 are matched with the shape of the rotating shaft 18. That is, when the rotating shaft 18 is embedded in the first position 20 and the second position 21, it can only move towards the connecting part 22 and cannot arbitrarily shake in the first position 20 and the second position 21. Moreover, the shape of the connecting part 22 is mainly matched with the trajectory of the moving link 13. In this embodiment, the rotating groove 19 is U-shaped in general, and the upper part of both sides of the groove 29 is provided with an arc surface 30 facing the hinge point of the movable arm 10 and the right support 27. Linkage component 13, such as Figure 3 As shown, there are two linkage components 13. Each linkage component 13 is V-shaped, with the lower end being the first connection point 15, the bent part being the second connection point 16, and the upper end being the third connection point 17. The bent parts of the two linkage components 13 are hinged to the hinge hole 32 of the left support 26 by a rotating shaft 28. The lower end is provided with an inward rotating shaft 18, which can extend into the rotating groove 19 and rotate and move within the rotating groove 19. The two rotating shafts 18 of the two linkage components 13 extend into the rotating grooves 19 on both sides of the groove 29 on the movable arm 10, and the rotating shafts 18 are also limited by snap rings so that the rotating shafts 18 will not detach from the rotating grooves 19. The upper end is also provided with an inward hinge shaft for the rotating wheel 14 to rotate and connect. There are two rotating wheels 14, which are rotatably connected to the hinge shafts at the upper ends of the two linkages 13 respectively. They are also limited by snap rings so that the rotating wheels 14 can only rotate on the hinge shafts. The surface of the rotating wheels 14 needs to be polished, which can also better reduce the friction between the rotating wheels 14 and the retaining ring 8. The working principle of this application is as follows: First, place the puller in the position to be repaired. At this time, the two support feet 2 are located on both sides of the dent to be repaired. Rotate the clamping ring 6 to adjust the position of the welding rod 3 so that the welding head 11 contacts the bottom of the dent. Then, clamp the welding clamp on the connecting ring 5 and turn on the power to weld and fix the welding head 11 to the bottom of the dent. After welding, the user presses down on the gripping part of the movable arm 10. The end of the movable arm 10 away from the gripping part will lift up, which will drive the linkage 13 to rotate counterclockwise along the rotating shaft 28. The rotating wheel 14, which is connected to the upper end of the linkage 13, will squeeze the retaining ring 8, thereby driving the sleeve 7 and the clamping ring 6 to move upward. Since the clamping ring 6 is threadedly connected to the welding rod 3, the welding rod 3 will also be lifted at the same time, thereby driving the welding head 11 to be lifted as well. Finally, the welding head 11 and the dent to be repaired will be pulled up together, and the dent will be pulled flat. Then, the handle 4 will be rotated to disengage the welding head 11 from the bottom of the dent, thus completing the repair of a single dent. This operation is repeated until all the dents to be repaired are pulled flat.

[0025] By adopting the above structure, this embodiment has the following technical effects: 1. Achieving reversal of movement direction to adapt to confined space layout: By setting a linkage 13 between the movable arm 10 and the retaining ring 8, and utilizing the rotation fulcrum formed by the hinge of the linkage 13 and the support frame 1, the force transmission direction and movement trajectory of the movable arm 10 can be changed. The movable arm 10 does not need to directly push the retaining ring 8. The lifting action of the welding rod 3 can be achieved in situations where the structural space is confined and the installation position is limited. The arrangement position and movement direction of the movable arm 10 are no longer strictly limited by the lifting direction of the welding rod 3, which improves the flexibility and adaptability of the product's structural layout.

[0026] II. Forming a lever amplification mechanism to improve the labor-saving effect: Since the first connection point 15, the second connection point 16, and the third connection point 17 on the linkage 13 are distributed in a triangle, the linkage 13 itself forms a stable lever transmission structure. The movable arm 10 only needs to swing slightly to drive the retaining ring 8 and the welding rod 3 to produce a larger lifting displacement through the lever amplification effect, which significantly reduces the amount of force applied by the operator, making the operation more convenient and labor-saving, and providing a better user experience.

[0027] Third, the use of a rotating wheel 14 significantly reduces friction loss: A rotatable rotating wheel 14 is set at the position where the linkage 13 and the retaining ring 8 abut, so that the traditional sliding friction between the linkage 13 and the retaining ring 8 is changed to rolling friction, which effectively reduces frictional resistance and component wear, avoids problems such as jamming and abnormal noise after long-term use, ensures smooth and reliable operation, and extends the overall service life of the product.

[0028] IV. Smooth motion transmission and higher motion precision: The linkage 13 forms a stable triangular transmission structure through three points, which ensures uniform force distribution and reliable transmission. During the lifting process, it is less prone to uneven load, swaying, or jamming. The welding rod 3 moves more smoothly, improving the stability and motion precision of the puller during operation.

[0029] V. Simple and compact structure, easy to process and assemble: This embodiment can achieve the above effect by simply adding a linkage 13 and a rotating wheel 14. There is no need for a complex transmission mechanism or additional power components. The overall structure is simple and has few parts, which facilitates production, processing, assembly, debugging and later maintenance. It helps to reduce production costs and improve product competitiveness.

[0030] Example 2: like Figure 5-6 As shown, the difference from Embodiment 1 is that the hinge hole 32 on the right support 27 in Embodiment 2 is an oblong hole. This allows for adjustment of the vertical position of the hinge between the movable arm 10 and the right support 27 as needed. An insertion hole is provided at the end of the movable arm 10 furthest from the gripping part, and multiple inserts 33 are provided that can be inserted into the insertion hole (the shape of the insert 33 perfectly matches the insertion hole, and the shape is not circular to prevent the insert 33 from rotating; in this embodiment, it is made elliptical, but it could also be made rectangular, so that the insert 33 can be directly inserted into the insertion hole without moving arbitrarily. After installation, the linkage 13 and the retaining spring can effectively fix the insert 33 in the insertion hole). Each insert 33 has a different rotation groove, allowing adjustment of the vertical position of the hinge of the movable arm 10 according to the required lifting stroke. Furthermore, a suitable rotation groove 19 (equivalent to selecting a suitable insert 33) is selected based on the hinge position of the movable arm 10. This allows for selection of different installation positions of the movable arm 10 and corresponding inserts 33 depending on the product being pulled, resulting in stronger overall adaptability.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0032] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. An automotive sheet metal dent puller, comprising a support frame, a support foot disposed at the bottom of the support frame, a welding rod vertically sliding on the support frame, a handle disposed at the upper end of the welding rod, a connecting ring disposed on the welding rod and located below the handle for clamping by welding clamps, a retaining ring threadedly connected to the welding rod for adjusting the position of the welding rod, a sleeve sleeved on the welding rod with its upper end abutting against the retaining ring, a retaining ring sleeved on the welding rod and abutting against the lower end of the sleeve, a fixed arm fixed to the support frame, a movable arm rotatably connected to the support frame, a welding head disposed at the lower end of the welding rod, and a return spring sleeved on the welding rod and located between the welding head and the support frame, characterized in that: It also includes a linkage and a rotating wheel. The linkage is provided with a first connection point for movably connecting to the end of the movable arm away from the gripping part, a second connection point for hinged to the support frame, and a third connection point for rotating the rotating wheel. The first connection point, the second connection point, and the third connection point are arranged in a triangle. The rotating wheel is rotatably connected to the third connection point of the linkage and abuts against the retaining ring. The support frame includes a support frame and support legs disposed on both sides of the lower end of the support frame. The support frame and support legs are integrally formed. The support frame includes an upper support, a lower support, a left support and a right support. The second connection point of the linkage is hinged to the left support and the movable arm is hinged to the right support. Both the upper support and the lower support are provided with through holes for the welding rod to pass through. The right support is provided with a hinge hole for the movable arm to hinge. The hinge hole is a waist-shaped hole arranged vertically. The end of the movable arm away from the gripping part is provided with an embedding hole. The puller also includes multiple inserts for embedding into the embedding hole. Each insert is provided with a rotating groove of different shapes.

2. The automotive sheet metal dent puller according to claim 1, characterized in that: A rotating shaft is provided at the first connection point of the linkage component, and a rotating groove is provided at the end of the movable arm away from the gripping part for the rotating shaft to rotate and move.

3. The automotive sheet metal dent puller according to claim 2, characterized in that: The rotating groove includes a first position, a second position, and a connecting portion that connects the first position and the second position and matches the movement path of the rotating shaft. When no force is applied to the movable arm, the pivot is in the first position; When force is applied to the movable arm, and the movable arm drives the linkage to press the retaining ring against the support frame, the rotating shaft is in the second position.

4. The automotive sheet metal dent puller according to claim 2, characterized in that: The linkage is V-shaped, with the first connection point located at one end of the V-shaped linkage, the third connection point located at the other end of the V-shaped linkage, and the second connection point located on the bent part of the V-shaped linkage.

5. The automotive sheet metal dent puller according to claim 1, characterized in that: There are two linkage components, and the two linkage components are rotatably connected to the two sides of the left frame through a rotating shaft. The end of the movable arm away from the gripping part is provided with a groove for the right support to pass through, and the ends of the two sides of the groove are respectively movably connected to the two linkage components.

6. The automotive sheet metal dent puller according to claim 5, characterized in that: The upper part of both sides of the groove is provided with an arc surface facing the hinge point between the movable arm and the right support.

7. The automotive sheet metal dent puller according to claim 1, characterized in that: The fixed arm is located at the lower end of the right support, and the support frame, support leg and fixed arm are integrally formed. The hinge position of the movable arm and the right support is located above the fixed arm.

8. The automotive sheet metal dent puller according to claim 1, characterized in that: The horizontal position of the hinge between the linkage and the left support is higher than the horizontal position of the hinge between the movable arm and the right support.

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