Chain wrench

Abstract

The invention discloses a chain wrench and relates to the field of wrenches. The chain wrench comprises a wrench unit and a fixing unit, an adjusting unit is arranged on one side of the wrench unit, a clamping unit is arranged in the wrench unit, the wrench unit comprises a sleeve and a chain, the clamping unit comprises a moving rod, a threaded rod and a connecting piece, the moving rod is slidably connected in the sleeve, the threaded rod is arranged in the moving rod, and the connecting piece is arranged in the sleeve. The threaded rod is in threaded connection with one end of the moving rod, the connecting piece is arranged on the bottom side of the sleeve and fixedly connected with the threaded rod, and the threaded rod is rotationally connected with the bottom end of the sleeve. According to the chain wrench, the rocker is rotated to drive the threaded rod to rotate, the threaded rod rotates to drive the moving rod to move forwards, then the clamping block is driven to move forwards until the clamping block abuts against a fastener, the fastener is fixed between the chain and the clamping block, and then secondary fixing is conducted on the fastener; the chain wrench is prevented from loosening and sliding in the locking or loosening process of the fastener.

Description

Technical Field

[0001] The invention relates to the technical field of wrenches, in particular to a chain wrench. Background Art

[0002] A wrench is a commonly used installation and removal tool that uses the principle of leverage to turn bolts, screws, nuts and other threaded fasteners. Wrenches are usually made of carbon structural steel or alloy structural steel and are sturdy and durable.

[0003] The use of wrenches is very wide. They can be used in many fields such as home repairs, car maintenance, and mechanical equipment installation. For example, at home, wrenches can be used to assemble furniture or tighten door handles; in car maintenance, wrenches can be used to replace tires or adjust engine parts; in the industrial field, wrenches are one of the indispensable tools for installing and repairing mechanical equipment.

[0004] However, in daily production and life, it is often encountered that there are no special tools to lock or loosen nuts, screws and other fasteners with special shapes. Generally, violent methods are used to lock or loosen them. This processing method not only damages the workpiece and causes waste, but also has low efficiency. In the existing technology, chain wrenches have appeared, which can lock or loosen some fasteners such as nuts with special shapes. However, some chain wrenches cannot effectively clamp the fasteners when clamping them. During the locking or loosening process, the chain wrench is prone to slip, and the fastener cannot be locked or loosened, affecting the subsequent work. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a chain wrench, which solves the problem that there are no special tools for locking or loosening fasteners such as nuts and screws with special shapes, and that violent methods are usually used to lock or loosen them. In addition, some chain wrenches cannot effectively clamp the fasteners when clamping them, and the chain wrenches are prone to slip during the locking or loosening process, making it impossible to lock or loosen the fasteners.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: the chain wrench includes a wrench unit and a fixing unit, the wrench unit and the fixing unit are connected, an adjustment unit is provided on one side of the wrench unit, and a clamping unit is provided inside the wrench unit;

[0007] The wrench unit includes a sleeve and a chain, and two ends of the chain are respectively connected to the fixing unit and the adjusting unit;

[0008] The clamping unit includes a moving rod, a threaded rod and a connecting piece. The moving rod is slidably connected in a sleeve, the threaded rod is arranged inside the moving rod, and the threaded rod is threadedly connected to one end of the moving rod. The connecting piece is arranged on the bottom side of the sleeve, and the connecting piece is fixedly connected to the threaded rod, and the threaded rod is rotatably connected to the bottom end of the sleeve.

[0009] Preferably, the fixing unit includes a support frame plate, a clamping plate, a plurality of limit blocks and a fastening bolt, the support frame plate is fixedly connected to the sleeve, the clamping plate is slidably connected in the support frame plate, the plurality of limit blocks are fixedly connected to the bottom of the clamping plate, and the limit blocks are inserted into the holes at one end of the chain, the fastening bolts pass through the top of the support frame plate and are rotatably connected to the clamping plate, and the fastening bolts are threadedly connected to the top of the support frame plate.

[0010] Preferably, the adjustment unit includes a cross-shaped rotating member, a rotating shaft, a ratchet box, a protective box and a gear, the cross-shaped rotating member is arranged on one side of the sleeve, one end of the rotating shaft is fixedly connected to the cross-shaped rotating member, and the other end passes through the ratchet box and is connected to the gear on the inner side of the protective box, the ratchet box is fixedly connected to the protective box, the protective box is fixedly connected to one side of the sleeve, the gear is rotatably connected in the protective box, and the gear is meshed with the other end of the chain.

[0011] Preferably, the rotating shaft is fixedly connected to the gear, and the rotating shaft is rotatably connected to an inner wall on one side of the protection box.

[0012] Preferably, the adjustment unit further includes a limit assembly, and the limit assembly is disposed in the ratchet box.

[0013] Preferably, the limiting assembly includes a ratchet, a clamping block, a fixed rod, a torsion spring and a lifting block, the ratchet is fixedly connected to the rotating shaft, one end of the clamping block is clamped with the ratchet, and the other end is rotatably connected to the fixed rod, the fixed rod is fixedly connected to the protective box, the torsion spring is arranged on the outside of the fixed rod, one end of the torsion spring is fixedly connected to the clamping block, and the other end is fixedly connected to the protective box, and the lifting block is fixedly connected to the top of the clamping block.

[0014] Preferably, a groove is provided on the top of the ratchet box, and the lifting block is movably connected in the groove.

[0015] Preferably, the clamping unit further comprises a rocker, and the rocker is fixedly connected to the connecting member.

[0016] Preferably, the wrench unit further comprises a shell, the shell is fixedly connected to a side of the sleeve close to the adjustment unit, and one end of the chain is slidably connected in the shell.

[0017] The present invention discloses a chain wrench, which has the following beneficial effects:

[0018] 1. During use, the chain wrench rotates the cross-shaped rotating part to drive the rotating shaft to rotate, and then drives the ratchet and gear to rotate. The gear rotation drives the chain to move. The ratchet and the block limit the rotation of the gear, so that fasteners of different shapes can be clamped and fixed, replacing the violent method of locking and loosening special fasteners, which not only improves the processing efficiency, but also protects the workpiece.

[0019] 2. When the chain wrench is in use, the rocker is rotated to drive the threaded rod to rotate. The threaded rod is threadedly connected to the fixed nut at the bottom of the moving rod. The rotation of the threaded rod drives the moving rod to move forward, and then drives the clamping block to move forward until it contacts the fastener, fixes the fastener between the chain and the clamping block, and then performs secondary fixation on the fastener, avoiding the chain wrench from loosening and sliding during the locking or loosening process.

[0020] 3. During the use of the chain wrench, a fixing unit is provided so that the other end of the chain is movably connected to one side of the sleeve, so that the chain can be installed and disassembled, and the chain damaged by long-term use can be replaced. The replacement is convenient and quick, and the contact friction between the new chain and the fastener is greater, so that the chain and the fastener are fixed more firmly and not easy to loosen. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the wrench unit of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the fixing unit of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the regulating unit of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the limit assembly of the present invention;

[0027] Figure 6 It is a schematic diagram of the structure of the clamping assembly of the present invention.

[0028] In the figure: 1. wrench unit; 11. sleeve; 12. chain; 13. housing; 2. fixing unit; 21. support frame plate; 22. clamping plate; 23. limit block; 24. fastening bolt; 3. adjustment unit; 31. cross-shaped rotating member; 32. rotating shaft; 33. ratchet box; 34. limit assembly; 341. ratchet; 342. clamping block; 343. fixing rod; 344. torsion spring; 345. lifting block; 35. protection box; 36. gear; 4. clamping unit; 41. moving rod; 411. clamping block; 412. fixing nut; 42. threaded rod; 43. connecting piece; 44. rocker. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The embodiment of the present application provides a chain wrench to solve the problem that there is no special tool for locking or loosening nuts, screws and other fasteners of special shapes. Usually, violent methods are used to lock or loosen them. Some chain wrenches cannot effectively clamp the fasteners when clamping the fasteners. During the locking or loosening process, the chain 12 is prone to slip, and the fasteners cannot be locked or loosened. The cross-shaped rotating member 31 is rotated to drive the rotating shaft 32 to rotate, and then the ratchet 341 and the gear 36 are driven to rotate. The rotation of the gear 36 drives the chain 12 to move. The ratchet 341 and the clamping block 342 are engaged to limit the rotation of the gear 36, so that fasteners of different shapes can be clamped and fixed, replacing the violent method of locking or loosening special fasteners, which not only improves the processing efficiency, but also protects the workpiece; the rocker 44 is rotated to drive the threaded rod 42 to rotate. The threaded rod 42 is threadedly connected to the fixed nut 412 at the bottom of the moving rod 41. The threaded rod 42 rotates to drive the moving rod 41 to move. The chain 12 is moved forward, thereby driving the clamping block 411 to move forward until it contacts the fastener, fixing the fastener between the chain 12 and the clamping block 411, and then performing secondary fixation on the fastener, thereby preventing the chain wrench from loosening and sliding during the tightening or loosening process of the fastener; by providing the fixing unit 2, the other end of the chain 12 is movably connected to one side of the sleeve 11, so that the chain 12 can be installed and removed, and the chain 12 worn out by long-term use can be replaced, and the replacement is convenient and quick, and the contact friction between the new chain 12 and the fastener is greater, so that the chain 12 is more firmly fixed to the fastener and is not easy to loosen.

[0031] The embodiment of the present invention discloses a chain wrench. Figure 1-6As shown, it includes a wrench unit 1 and a fixing unit 2, the wrench unit 1 and the fixing unit 2 are connected, an adjusting unit 3 is arranged on one side of the wrench unit 1, a clamping unit 4 is arranged inside the wrench unit 1, and the wrench unit 1 includes a sleeve 11 and a chain 12, and both ends of the chain 12 are respectively connected to the fixing unit 2 and the adjusting unit 3.

[0032] Particularly disclosed, the clamping unit 4 includes a moving rod 41, a threaded rod 42 and a connecting piece 43, the moving rod 41 is slidably connected in the sleeve 11, the threaded rod 42 is arranged inside the moving rod 41, and the threaded rod 42 is threadedly connected to one end of the moving rod 41, the connecting piece 43 is arranged on the bottom side of the sleeve 11, and the connecting piece 43 is fixedly connected to the threaded rod 42, and the threaded rod 42 is rotatably connected to the bottom end of the sleeve 11.

[0033] Furthermore, the fixing unit 2 includes a support frame plate 21, a clamping plate 22, a plurality of limit blocks 23 and a fastening bolt 24. The support frame plate 21 is fixedly connected to the sleeve 11, and the clamping plate 22 is slidably connected in the support frame plate 21. A plurality of limit blocks 23 are fixedly connected to the bottom of the clamping plate 22, and the limit blocks 23 are inserted into the holes at one end of the chain 12. The fastening bolt 24 passes through the top of the support frame plate 21 and is rotatably connected to the clamping plate 22, and the fastening bolt 24 is threadedly connected to the top of the support frame plate 21. By setting the fixing unit 2, the other end of the chain 12 is movably connected to one side of the sleeve 11, so that the chain 12 can be installed and disassembled, and the chain 12 that has been used for a long time can be replaced, and the replacement is convenient and quick.

[0034] Specifically disclosed, the adjustment unit 3 includes a cross-shaped rotating member 31, a rotating shaft 32, a ratchet box 33, a protective box 35 and a gear 36. The cross-shaped rotating member 31 is arranged on one side of the sleeve 11, one end of the rotating shaft 32 is fixedly connected to the cross-shaped rotating member 31, and the other end passes through the ratchet box 33 and is connected to the inner side of the protective box 35 with the gear 36. The ratchet box 33 is fixedly connected to the protective box 35, and the protective box 35 is fixedly connected to one side of the sleeve 11. The gear 36 is rotatably connected in the protective box 35, and the gear 36 is meshed with the other end of the chain 12.

[0035] Furthermore, the rotating shaft 32 is fixedly connected to the gear 36, and the rotating shaft 32 is rotatably connected to the inner wall of one side of the protective box 35. By rotating the cross-shaped rotating member 31, the rotating shaft 32 is driven to rotate, and then the ratchet 341 and the gear 36 are driven to rotate. The gear 36 is meshed with the chain 12. The gear 36 rotates clockwise or counterclockwise to drive the chain 12 to move left and right, thereby realizing the adjustment of the exposed length of the chain 12.

[0036] Furthermore, the adjustment unit 3 also includes a limit assembly 34, which is arranged in the ratchet box 33. By setting the limit assembly 34, the gear 36 is limited to rotate, and then the chain 12 is limited to move in the opposite direction, so that during the process of locking or loosening the fastener, the chain 12 will not rotate and cause the chain 12 to loosen and slide. When the wrench needs to be removed from the fastener, the lifting block 345 on the ratchet box 33 is lifted so that the block 342 does not abut against the ratchet 341, so that the ratchet 341 is in a free rotation state, and the cross-shaped rotating member 31 is rotated in the opposite direction to drive the rotating shaft 32 to move in the opposite direction, and then drive the ratchet 341 and the gear 36 to rotate in the opposite direction. The reverse rotation of the gear 36 drives the chain 12 to move in the opposite direction, so that the chain 12 is loosened from the fastener.

[0037] The particularly disclosed limiting assembly 34 includes a ratchet 341, a block 342, a fixing rod 343, a torsion spring 344 and a lifting block 345. The ratchet 341 is fixedly connected to the rotating shaft 32. The ratchet 341 is provided with a plurality of ratchet teeth around a circle. One end of the block 342 is engaged with the ratchet 341, and the other end is rotatably connected to the fixing rod 343. The fixing rod 343 is fixedly connected to the protection box 35. The torsion spring 344 is arranged on the outer side of the fixing rod 343. One end of the torsion spring 344 is fixedly connected to the block 342, and the other end is fixedly connected to the protection box 35. The lifting block 345 is fixedly connected to the top of the block 342. By limiting the ratchet 341 and the block 342, the rotation of the gear 36 is limited, so that fasteners of different shapes can be clamped and fixed, replacing the violent method of locking or loosening special fasteners, which not only improves the processing efficiency but also protects the workpiece.

[0038] Furthermore, a groove is provided on the top of the ratchet box 33, and the lifting block 345 is movably connected in the groove. The lifting block 345 swings in an arc in the groove as the clamping block 342 swings. The clamping block 342 is rotatably connected to one end of the fixing rod 343. Under the action of the torsion spring 344, the clamping block 342 is always engaged with the ratchet teeth of the ratchet 341. As the ratchet 341 rotates, the ratchet teeth squeeze the clamping block 342 to move to the top of the ratchet teeth. After passing the top of the ratchet teeth, the clamping block 342 is engaged with the bottom of the ratchet teeth under the action of the torsion spring 344.

[0039] Furthermore, the clamping unit 4 also includes a rocker 44, which is fixedly connected to the connecting piece 43. By rotating the rocker 44, the threaded rod 42 is driven to rotate. The threaded rod 42 is threadedly connected to the fixed nut 412 at the bottom end of the moving rod 41. The rotation of the threaded rod 42 drives the moving rod 41 to move forward, and then drives the clamping block 411 to move forward until it abuts against the fastener, fixing the fastener between the chain 12 and the clamping block 411, and then performing secondary fixation on the fastener, thereby preventing the chain 12 from loosening and sliding during the locking or loosening process.

[0040] Furthermore, the wrench unit 1 also includes a shell 13, which is fixedly connected to the side of the sleeve 11 close to the adjustment unit 3, and one end of the chain 12 is slidably connected in the shell 13. By setting the shell 13, not only can the chain 12 slide in the shell 13 in an orderly manner, but also when the operator uses the wrench, the chain 12 will not affect the locking or loosening operation of the fastener.

[0041] Working principle: first, put the chain 12 on the fastener, rotate the cross-shaped rotating member 31, drive the rotating shaft 32 to rotate, and then drive the ratchet 341 and the gear 36 to rotate, the gear 36 rotates and drives the chain 12 to move until the chain 12 abuts against the fastener, the ratchet 341 rotates and drives the clamping block 342 to swing back and forth, the clamping block 342 is always clamped on the ratchet 341, restricting the rotation of the ratchet 341, and then restricting the rotation of the gear 36, and then restricting the chain 12 from moving back, then rotate the rocker 44, and then drive the threaded rod 42 to rotate, the threaded rod 42 rotates and drives the moving rod 41 to move forward, and then drives the clamping block 411 to move toward the fastener, until the clamping block 411 clamps the fastener between the clamping block 411 and the chain 12, and the fastener is fixed, and the sleeve 11 is rotated to drive the clamped chain 12 and the fastener to rotate, and the fastener is locked or loosened;

[0042] After locking or loosening is completed, the wrench needs to be removed from the fastener. First, the rocker 44 is rotated in the opposite direction to drive the threaded rod 42 to rotate in the opposite direction, and then the movable rod 41 is driven to move into the sleeve 11, so that the clamping block 411 is away from the fastener. Then, the lifting block 345 on the ratchet box 33 is pulled up so that the clamping block 342 does not abut against the ratchet 341. Then, the cross-shaped rotating member 31 is rotated in the opposite direction to drive the rotating shaft 32 to move in the opposite direction, and then the ratchet 341 and the gear 36 are driven to rotate in the opposite direction. The gear 36 rotates in the opposite direction to drive the chain 12 to move in the opposite direction, so that the chain 12 and the fastener are loosened, and the entire wrench is taken out.

[0043] When replacing the chain 12, firstly, turn the fastening bolt 24 to drive the pressing plate 22 to move upward, and then drive the limit block 23 to move out of the hole of the chain 12, and then pull out one end of the chain 12 from the support frame plate 21, and then pull up the lifting block 345 on the ratchet box 33, and pull out the other end of the chain 12 from the protection box 35 and the housing 13;

[0044] Replace the new chain 12, then pass one end of the new chain 12 through the support frame plate 21, then rotate the fastening bolt 24 in the opposite direction to drive the clamping plate 22 to move downward, and then drive the limit block 23 to move downward, and the limit block 23 is inserted into the hole of the chain 12 until the clamping plate 22 presses the chain 12 on the sleeve 11, and the limit block 23 passes through the hole of the chain 12 and presses on the sleeve 11, and the chain 12 is fixed for the second time. Then, the other end of the new chain 12 is placed at the entrance of the protection box 35, so that the chain 12 is meshed with the gear 36, and then the cross-shaped rotating member 31 is rotated to drive the gear 36 to rotate the chain 12 to move into the housing 13, and the replacement of the chain 12 is completed.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A chain wrench, comprising a wrench unit (1) and a fixing unit (2), wherein the wrench unit (1) and the fixing unit (2) are connected, and characterized in that: An adjustment unit (3) is provided on one side of the wrench unit (1), and a clamping unit (4) is provided inside the wrench unit (1); The wrench unit (1) comprises a sleeve (11) and a chain (12), and two ends of the chain (12) are respectively connected to the fixing unit (2) and the adjusting unit (3); The clamping unit (4) comprises a moving rod (41), a threaded rod (42) and a connecting piece (43); the moving rod (41) is slidably connected in the sleeve (11); the threaded rod (42) is arranged inside the moving rod (41), and the threaded rod (42) is threadedly connected to one end of the moving rod (41); the connecting piece (43) is arranged on the bottom side of the sleeve (11), and the connecting piece (43) is fixedly connected to the threaded rod (42); the threaded rod (42) is rotatably connected to the bottom end of the sleeve (11).

2. The chain wrench according to claim 1, characterized in that: The fixing unit (2) comprises a support frame plate (21), a pressing plate (22), a plurality of limit blocks (23) and fastening bolts (24); The support frame plate (21) is fixedly connected to the sleeve (11), the clamping plate (22) is slidably connected inside the support frame plate (21), a plurality of limit blocks (23) are fixedly connected to the bottom of the clamping plate (22), and the limit blocks (23) are inserted into holes at one end of the chain (12), the fastening bolts (24) pass through the top of the support frame plate (21) and are rotatably connected to the clamping plate (22), and the fastening bolts (24) are threadedly connected to the top of the support frame plate (21).

3. The chain wrench according to claim 1, characterized in that: The adjustment unit (3) comprises a cross-shaped rotating member (31), a rotating shaft (32), a ratchet box (33), a protection box (35) and a gear (36); The cross-shaped rotating member (31) is arranged on one side of the sleeve (11); one end of the rotating shaft (32) is fixedly connected to the cross-shaped rotating member (31), and the other end passes through the ratchet box (33) and is connected to the inner side of the protection box (35) with a gear (36); the ratchet box (33) is fixedly connected to the protection box (35); the protection box (35) is fixedly connected to one side of the sleeve (11); the gear (36) is rotatably connected in the protection box (35); and the gear (36) is meshedly connected with the other end of the chain (12).

4. The chain wrench according to claim 3, characterized in that: The rotating shaft (32) is fixedly connected to the gear (36), and the rotating shaft (32) is rotatably connected to the inner wall of one side of the protection box (35).

5. The chain wrench according to claim 3, characterized in that: The adjustment unit (3) further comprises a position limiting assembly (34), and the position limiting assembly (34) is arranged in the ratchet box (33).

6. The chain wrench according to claim 5, characterized in that: The limiting assembly (34) comprises a ratchet (341), a clamping block (342), a fixing rod (343), a torsion spring (344) and a lifting block (345); The ratchet (341) is fixedly connected to the rotating shaft (32), one end of the clamping block (342) is clamped with the ratchet (341), and the other end is rotatably connected to the fixing rod (343), the fixing rod (343) is fixedly connected to the protection box (35), the torsion spring (344) is arranged on the outside of the fixing rod (343), one end of the torsion spring (344) is fixedly connected to the clamping block (342), and the other end is fixedly connected to the protection box (35), and the lifting block (345) is fixedly connected to the top of the clamping block (342).

7. The chain wrench according to claim 6, characterized in that: The top of the ratchet box (33) is provided with a groove, and the lifting block (345) is movably connected in the groove.

8. The chain wrench according to claim 1, characterized in that: One end of the moving rod (41) is fixedly connected to a clamping block (411), and the other end of the moving rod (41) is internally fixedly connected to a fixing nut (412), and the fixing nut (412) is fixedly connected to the threaded rod (42).

9. The chain wrench according to claim 1, characterized in that: The clamping unit (4) further comprises a rocker (44), wherein the rocker (44) is fixedly connected to the connecting member (43).

10. The chain wrench according to claim 1, characterized in that: The wrench unit (1) further comprises a housing (13), wherein the housing (13) is fixedly connected to a side of the sleeve (11) close to the adjustment unit (3), and one end of the chain (12) is slidably connected in the housing (13).

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