Torsion-adjustable ratchet wrench

Abstract

The torque-adjustable ratchet wrench comprises a shell, a connecting rod and a wheel carrier, the middle of the connecting rod is hinged to the shell, the end, away from the wheel carrier, of the connecting rod is connected with a groove block, the other end of the shell is rotationally connected with a sleeve rod, and a plurality of torsional springs with the radial sizes sequentially reduced are arranged in the sleeve rod in a penetrating mode; a threaded rod coaxial with the torsional springs penetrates through the penetrating hole in a threaded mode, one end of the threaded rod extends into the shell and is connected with a groove column, square grooves are formed in the sides, close to each other, of the groove block and the groove column, a positioning block is jointly borne in the two square grooves, and the other end of the threaded rod is sleeved with a plurality of baffle rings which are sequentially connected in a threaded mode and correspond to the torsional springs in a one-to-one mode; and a limiting assembly for preventing the two adjacent baffle rings from rotating relatively is arranged in the sleeve rod, and a locking structure for limiting rotation of the sleeve rod is arranged on the shell. According to the ratchet wrench, the structure of the ratchet wrench is improved, the structure of the ratchet wrench is more compact, meanwhile, the ratchet wrench can adjust torsion within two ranges, and therefore different torsion adjusting requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of torque wrenches, and particularly relates to a torque-adjustable ratchet wrench. BACKGROUND

[0002] A ratchet wrench is a kind of hand-operated screw tightening and loosening tool, which is mainly used for rotating bolts or nuts in narrow or hard-to-reach positions. It connects main and secondary hexagonal sleeves of different specifications and sizes through the engagement of female and male keys of the hinged key, and has the characteristics of strong applicability, convenient use and low cost.

[0003] The internal structure of the ratchet wrench includes a wrench body, a clamping spring, a pawl, a spring and a ratchet wheel. The ratchet wheel is composed of a ratchet wheel body and a spacer sleeve, and the spacer sleeve is provided with a concave ring groove on the periphery. The ratchet wrench realizes unidirectional intermittent motion through the ratchet mechanism composed of the ratchet wheel and the pawl, and is suitable for indexing of various machine tool intermittent feeds or rotary tables, and is also commonly used in jacks and hand winches.

[0004] At present, the torque-adjustable ratchet wrench has become the mainstream in the market. It can prevent nuts or bolts from being rotated excessively during the tightening process, thereby ensuring the structural integrity of the nuts or bolts. However, for complex mechanical disassembly and assembly operations, the ratchet wrench with an adjustable torque range cannot simultaneously adapt to the tightening requirements of large and small parts, resulting in the problem of small application range of the ratchet wrench. CONTENT OF THE INVENTION

[0005] In order to improve the structure of the ratchet wrench and make the ratchet wrench applicable to the tightening requirements of more nuts or bolts of different sizes, the present application provides a torque-adjustable ratchet wrench.

[0006] The torque-adjustable ratchet wrench provided by the present application adopts the following technical scheme:

[0007] A torque-adjustable ratchet wrench, comprising a shell, a connecting rod arranged in the shell, and a wheel frame connected to one end of the connecting rod and protruding out of one end of the shell, the middle part of the connecting rod is hinged to the shell, and a slot block is connected to the end away from the wheel frame, the other end of the shell is rotatably connected to a sleeve rod provided with a through hole along the axis, a plurality of torsional springs with decreasing radial sizes are arranged in the sleeve rod, a screw rod coaxial with the torsional springs is threadedly arranged in the through hole, one end of each torsional spring protrudes into the shell and is connected to a slot column, a square slot is formed on one side of each of the slot block and the slot column, and an adjusting block is loaded in the two square slots, a plurality of stop rings corresponding to the torsional springs are threadedly arranged in the sleeve rod, a limiting component is arranged in the sleeve rod to prevent adjacent two stop rings from rotating synchronously, and a locking structure is arranged on the shell to limit the rotation of the sleeve rod.

[0008] Optionally, the limiting assembly comprises a plurality of connecting rings connected to the torsion springs in sequence at the end away from the shell and corresponding to the blocking rings, a plurality of spur gears arranged on the connecting rings in the circumferential direction, and a plurality of spur gears arranged on the blocking rings close to the torsion springs in the circumferential direction, and the spur gears and the spur gears of the same group of blocking rings and connecting rings are engaged with each other.

[0009] Optionally, the outer ring of each of the blocking rings close to the torsion spring is integrally connected with a limiting rib, and the inner ring is provided with a limiting stepped groove matched in size with the limiting rib on the adjacent blocking ring.

[0010] Optionally, the locking structure comprises a plurality of locking grooves arranged on the outer side of the shell in the circumferential direction, a locking sleeve integrally connected to the end of the sleeve rod close to the shell, and a push ring slidingly arranged on the outer side of the shell, the locking sleeve is provided with a sliding groove on the side close to the shell, the push ring is integrally connected with a sliding ring slidingly arranged in the sliding groove, the end of the sliding ring is provided with a slope structure, the inner wall of the sliding groove is movably embedded with a plurality of positioning blocks in the circumferential direction, and the bottoms of the positioning blocks are slidingly arranged in the locking grooves in one-to-one correspondence.

[0011] Optionally, the wheel frame comprises a mounting seat connected to the end of the connecting rod, a ratchet wheel rotatably arranged on the mounting seat, a sleeve for matching the nut integrally connected with the ratchet wheel, and a pawl rotatably arranged on the mounting seat, one end of the pawl is engaged with the ratchet wheel, and a clamping spring is connected between the pawl and the mounting seat, the mounting seat is slidingly provided with an adjusting key for controlling the rotating direction of the pawl.

[0012] Optionally, the adjusting key comprises a penetrating shaft coaxial with the pawl, two pressing plates connected to the two ends of the penetrating shaft respectively, and two adjusting columns arranged on the mutually close sides of the two pressing plates respectively, the two adjusting columns are respectively corresponding to the same end of the two limiting arc grooves, and when one of the pressing plates is stressed, the adjusting column connected therewith enters the corresponding limiting arc groove and the other adjusting column is out of the other limiting arc groove, when the adjusting column slides to the other end of the limiting arc groove, the pawl is separated from the ratchet wheel.

[0013] Optionally, the mounting seat is symmetrically provided with two stepped clamping grooves at the two ends, the two pressing plates are slidingly arranged in the two stepped clamping grooves respectively, and the mutually far sides of the two pressing plates are always below the notches of the two stepped clamping grooves.

[0014] Optionally, one end of the mounting base is integrally connected to a spherical joint groove, and the end of the connecting rod is integrally connected to a joint ball that rotatably fits within the joint groove. The end of the connecting rod near the joint ball has a square structure, the groove opening is adapted to the width of the connecting rod end, and the groove opening length is greater than the cross-sectional length of the connecting rod.

[0015] In summary, this application includes at least one of the following beneficial technical effects:

[0016] 1. The ratchet wrench of this application has multiple torsion springs inside, which can adjust the torque range to meet the tightening requirements of nuts or bolts of different sizes, thus expanding the applicability of the ratchet wrench and making it more practical;

[0017] 2. This application improves the structure of the ratchet wrench, making the overall structure of the ratchet wrench more compact, thereby saving production costs and improving cost performance;

[0018] 3. The ratchet wrench of this application can realize functions such as quick switching between forward and reverse rotation and tilting rotation of the handle position, which improves the ease of operation of the ratchet wrench and adapts to more complex operating environment requirements. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a torque-adjustable ratchet wrench according to this application.

[0020] Figure 2 yes Figure 1 Cross-sectional view at point AA.

[0021] Figure 3 This is a schematic diagram of the internal structure of a torque-adjustable ratchet wrench according to this application.

[0022] Figure 4 This is an exploded view of the connection structure between two adjacent retaining rings of a torque-adjustable ratchet wrench according to this application.

[0023] Figure 5 This is an exploded view of the locking structure of a torque-adjustable ratchet wrench according to this application.

[0024] Figure 6 This is a schematic diagram of the internal structure of the wheel frame of a torque-adjustable ratchet wrench according to this application.

[0025] Figure 7 This is an exploded view of the internal structure of the wheel frame of a torque-adjustable ratchet wrench according to this application.

[0026] Figure 8 yes Figure 2 A magnified view of point A in the middle.

[0027] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Hinge shaft; 12. Groove column; 2. Connecting rod; 21. Groove block; 211. Square groove; 212. Adjusting block; 22. Joint ball; 3. Wheel frame; 31. Mounting base; 311. Stepped groove; 312. Joint groove; 32. Ratchet; 33. Pawl; 331. Limiting arc groove; 34. Locking tooth; 35. Adjusting key; 351. Through shaft; 352. 1. Pressing plate; 353. Adjusting column; 4. Sleeve rod; 41. Screw rod; 411. Retaining ring; 4111. Limiting rib; 4112. Limiting stepped groove; 5. Torsion spring; 6. Limiting component; 61. Connecting ring; 611. Positive tooth; 62. Negative tooth; 7. Locking structure; 71. Locking groove; 72. Locking collar; 721. Sliding groove; 73. Push ring; 731. Slip ring; 74. Positioning block. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0029] This application discloses a torque-adjustable ratchet 32 ​​wrench.

[0030] Reference Figure 1 A torque-adjustable ratchet wrench 32 includes a housing 1, a connecting rod 2 passing through the housing 1, and a wheel frame 3 connected to one end of the connecting rod 2. The lateral dimension of the connecting rod 2 is smaller than the inner diameter of the housing 1, and a hinge shaft 11, hinged to the connecting rod 2, passes through the housing 1 near its end, allowing the connecting rod 2 to swing radially within the housing 1. The wheel frame 3 extends beyond the end of the housing 1 and is used to connect a nut or bolt that needs to be turned. A sleeve 4 is rotatably connected to the end of the housing 1 away from the wheel frame 3, and a screw 41, with one end extending into the housing 1, is threaded along its axis at the end of the sleeve 4 near the housing 1.

[0031] Reference Figure 2 and Figure 3 A plurality of torsion springs 5 ​​are movably disposed within the sleeve rod 4, and a plurality of retaining rings 411, threaded together sequentially, are fitted onto the screw rod 41 at the end of the torsion springs 5 ​​away from the housing 1. Each retaining ring 411 corresponds one-to-one with a torsion spring 5, and the cross-sectional area of ​​the retaining rings 411 within the same group is the same as that of the torsion springs 5. A grooved column 12 is slidably connected within the housing 1, and the grooved column 12 is connected to the same end of the plurality of torsion springs 5. A grooved block 21 is connected to the end of the connecting rod 2 away from the wheel frame 3. Square grooves 211 are formed on the sides of the grooved block 21 and the grooved column 12 that are close to each other. An adjusting block 212 is supported in both square grooves 211, and the adjusting block 212 has a square cross-section.

[0032] When the sleeve rod 4 is rotated, the screw 41 moves along the axis. At this time, the retaining ring 411 moves with the screw 41 and compresses or relaxes the torsion spring 5. Since the torsion spring 5 is connected to the slotted post 12, the elastic torsional force of the torsion spring 5 will increase or decrease, thereby changing the compressive force on the positioning block 74. If the ratchet 32 ​​wrench is used at this time, the connecting rod 2 will drive the slotted block 21 to deflect within the housing 1 and compress the positioning block 74. If the compressive limit is exceeded, the positioning block 74 will rotate and compress the slotted post 12 downward, making a clicking sound, indicating that the predetermined torque limit has been reached.

[0033] Reference Figure 3 When adjusting the different torque ranges of the ratchet 32 ​​wrench, simply rotate the screw 41 to separate the corresponding retaining ring 411 from another adjacent retaining ring 411. At this time, the retaining ring 411 contacts and acts on the torsion spring 5 of the same group. Rotating the sleeve 4 compresses and releases the torsion spring 5. A limiting component 6 is provided inside the sleeve 4 to prevent the two adjacent retaining rings 411 from rotating synchronously when the screw 41 drives them to separate.

[0034] Specifically, the limiting component 6 includes several connecting rings 61 respectively fixedly connected to the ends of several torsion springs 5. The connecting rings 61 and several retaining rings 411 are sized and correspond one-to-one. On the side of the connecting rings 61 and the retaining rings 411 that are close to each other, positive teeth 611 and negative teeth 62 are integrally connected along the circumference, and the positive teeth 611 and negative teeth 62 mesh with each other. When the connecting rings 61 and the retaining rings 411 of the same group come into contact, rotating the screw 41 will compress the torsion springs 5, and the connecting rings 61 and the retaining rings 411 can still rotate relative to each other.

[0035] When the torsion spring 5 is compressed to the predetermined maximum value, the connecting ring 61 and the retaining ring 411 in the same group will mesh and jam under the action of the positive tooth 611 and the negative tooth 62. At this time, rotating the screw 41 will cause the two adjacent retaining rings 411 to separate, and the smaller retaining ring 411 will contact the connecting ring 61 on another torsion spring 5 in the same group, thereby realizing the switching of the torque adjustment range.

[0036] Reference Figure 4 Furthermore, each of the retaining rings 411 has an integrally connected limiting rib 4111 on its outer ring near the retaining ring 411, while the inner ring has a limiting stepped groove 4112. The limiting rib 4111 on the outer ring of the same retaining ring 411 mates with the limiting stepped groove 4112 on the adjacent outer retaining ring 411, and the limiting stepped groove 4112 on its inner ring mates with the limiting rib 4111 on the inner retaining ring 411. This structure ensures that the retaining rings 411 are always on the same plane when the ratchet 32 ​​wrench is not adjusted for torque, and also ensures that multiple retaining rings 411 can be smoothly threaded together.

[0037] Reference Figure 5The housing 1 is provided with a locking structure 7 to restrict the rotation of the lever 4, thereby locking the torque value when the ratchet 32 ​​wrench is used. The locking structure 7 specifically includes several locking grooves 71 circumferentially formed on the housing 1, a locking collar 72 integrally connected to one end of the lever 4 near the housing 1, and a push ring 73 slidably sleeved on the outside of the housing 1. The locking grooves 71 are elongated strip structures. Several positioning blocks 74 corresponding to the locking collar 72 are movably embedded circumferentially on the inner ring of the locking collar 72, and the bottom of the positioning blocks 74 are slidably disposed in the locking grooves 71.

[0038] The locking collar 72 has a groove 721 near the end of the housing 1. The push ring 73 is integrally connected to a sliding ring 731 that slides within the groove 721, and the inner side of the sliding ring 731 away from the push ring 73 has a sloping structure. Several positioning blocks 74 are inserted into the groove 721 at their tops. When the sliding ring 731 enters the groove 721, the sliding ring 731 presses each positioning block 74 into the locking groove 71, thereby locking the rotation of the sleeve rod 4.

[0039] Reference Figure 6 and Figure 7 The wheel frame 3 specifically includes a mounting base 31 connected to the connecting rod 2, a ratchet 32 ​​rotatably embedded in the mounting base 31, a sleeve integrally connected to the ratchet 32, and a pawl 33 rotatably mounted on the mounting base 31. One end of the pawl 33 is integrally connected to a retaining tooth 34 for engaging with the ratchet 32. The sleeve connects different sizes of screws to accommodate different nuts and bolts, creating a clamping effect. A retaining spring connects the pawl 33 to the mounting base 31, allowing the pawl 33 to automatically reset and engage when the ratchet 32 ​​is rotated in either direction.

[0040] Two limiting arc grooves 331 are symmetrically opened at both ends of the pawl 33 along the direction perpendicular to the tooth 34. An adjustment key 35 is slidably passed through the mounting base 31 to restrict the pawl 33 to rotate only in one direction, thereby restricting the rotation of the ratchet 32 ​​so that it can only rotate in one direction.

[0041] Reference Figure 7The adjustment key 35 includes a through shaft 351 coaxial with the pawl 33, two pressing plates 352 respectively connected to both ends of the through shaft 351, and two adjusting posts 353 respectively disposed on the two pressing plates 352, close to each other. The two adjusting posts 353 correspond to the same end of the two limiting arc grooves 331 on the pawl 33. When one of the pressing plates 352 is subjected to force, the adjusting post 353 connected to it will enter the corresponding limiting arc groove 331, at which time the pawl 33 and the ratchet 32 ​​can only rotate in one direction. Furthermore, when one adjusting post 353 enters the corresponding limiting arc groove 331, the adjusting post 353 on the other pressing plate 352 will disengage from the corresponding limiting arc groove 331.

[0042] Reference Figure 1 and Figure 7 Furthermore, the mounting base 31 has two symmetrical stepped slots 311 at both ends, and two pressing plates 352 are slidably disposed in the two stepped slots 311 respectively. When the pressing plate 352 slides in the stepped slot 311, its top is always below the opening of the stepped slot 311, so as to reduce the risk of accidental contact when using the ratchet 32 ​​wrench.

[0043] Reference Figure 8 The mounting base 31 has a spherical joint groove 312 integrally connected to one end, and the end of the connecting rod 2 is integrally connected to a ball joint 22 that rotatably fits within the joint groove 312, ensuring that the connecting rod 2 can rotate around the mounting base 31, thus providing a wider application range for the ratchet 32 ​​wrench. Simultaneously, to ensure effective torque adjustment, the groove opening of the joint groove 312 is designed to match the width of the end of the connecting rod 2, and the length of the joint groove 312 is greater than the cross-sectional length of the connecting rod 2, meaning that the connecting rod 2 can only move in a plane perpendicular to its extension direction. This design does not affect the torque adjustment structure and allows the ratchet 32 ​​wrench to be used smoothly even in environments where planar rotation is not possible.

[0044] The implementation principle of the torque-adjustable ratchet 32 ​​wrench in this application embodiment is as follows:

[0045] By setting multiple torsion springs 5 ​​inside the sleeve 4, different torsion springs 5 ​​can be switched when the ratchet 32 ​​wrench is used for torque adjustment, thereby adapting to more nuts or bolts of different sizes and specifications and expanding the application range of the ratchet 32 ​​wrench.

[0046] Furthermore, this application improves the locking structure 7 and the structure of the wheel frame 3 of the ratchet 32 ​​wrench. Through the design of the slip ring 731 and the sliding groove 721, the engagement effect between the positioning block 74 and the locking groove 71 is improved, preventing accidental rotation of the ratchet 32 ​​wrench during locking. The wheel frame 3 restricts the rotation of the pawl 33 by using the pressing plate 352 and the adjusting pin 353. This structure is not only simpler than existing technologies but also less prone to damage. The above structures also make the ratchet 32 ​​wrench more compact, providing a higher cost-performance ratio for the overall ratchet 32 ​​wrench.

[0047] Meanwhile, the design of the joint groove 312 and the joint ball 22 allows the ratchet 32 ​​wrench to be used on non-planar surfaces, greatly improving the ease of operation of the ratchet 32 ​​wrench.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A torque-adjustable ratchet (32) wrench, comprising a housing (1), a connecting rod (2) passing through the housing (1), and a wheel frame (3) connected to one end of the connecting rod (2) and extending out of one end of the housing (1), wherein the middle part of the connecting rod (2) is hinged to the housing (1), and a groove block (21) is connected to the end away from the wheel frame (3), and a sleeve (4) with a through hole on one side along the axis is rotatably connected to the other end of the housing (1), characterized in that: The sleeve rod (4) is provided with a plurality of torsion springs (5) with gradually decreasing radial sizes, the through hole is provided with a plurality of screw rods (41) coaxial with the plurality of torsion springs (5), one end of the plurality of torsion springs (5) extends into the shell (1) and is connected with a slot column (12), the slot block (21) and the slot column (12) are provided with square grooves (211) on the side close to each other, and the two square grooves (211) jointly bear an adjusting block (212), the other end of the screw rod (41) is provided with a plurality of stop rings (411) which are sequentially screwed and correspond to the torsion springs (5) one by one, and the sleeve rod (4) is provided with a limiting assembly (6) for preventing synchronous rotation of adjacent two stop rings (411), and the shell (1) is provided with a locking structure (7) for limiting rotation of the sleeve rod (4).

2. A torque adjustable type ratchet (32) wrench according to claim 1, characterized in that: The limiting assembly (6) comprises a plurality of connecting rings (61) connected to the ends of the plurality of torsion springs (5) away from the shell (1) and corresponding to the stop rings (411) one by one, a plurality of spur gears (611) arranged on the connecting ring (61) in the circumferential direction, and a plurality of negative gears (62) arranged on the side close to the torsion spring (5) of the stop ring (411) in the circumferential direction, and the plurality of spur gears (611) and the plurality of negative gears (62) of the same group of stop rings (411) and connecting rings (61) are engaged with each other.

3. A torque adjustable type of ratchet (32) wrench according to claim 2, characterized in that: The outer ring of the plurality of stop rings (411) close to the torsion spring (5) side is integrally connected with a limiting rib (4111), and the inner ring is provided with a limiting stepped groove (4112) matched in size with the limiting rib (4111) on the adjacent stop ring (411).

4. A torque adjustable type of ratchet (32) wrench according to claim 1, characterized in that: The locking structure (7) comprises a plurality of locking grooves (71) arranged on the outer side of the shell (1) in the circumferential direction, a locking sleeve ring (72) integrally connected to the end of the sleeve rod (4) close to the shell (1), and a push ring (73) slidably sleeved on the outer side of the shell (1), the locking sleeve ring (72) is provided with a sliding groove (721) on the side close to the shell (1), the push ring (73) is integrally connected with a sliding ring (731) slidably matched in the sliding groove (721), and the inner side of the end of the sliding ring (731) is a slope structure, a plurality of positioning blocks (74) are movably embedded on the inner wall of the sliding groove (721) in the circumferential direction, and the bottoms of the plurality of positioning blocks (74) are slidably arranged in the plurality of locking grooves (71) one by one.

5. A torque adjustable type of ratchet (32) wrench according to claim 1, characterized in that: The wheel frame (3) comprises a mounting base (31) connected with the end of the connecting rod (2), a ratchet wheel (32) rotatably embedded on the mounting base (31), a sleeve for matching the nut integrally connected with the ratchet wheel (32), and a pawl (33) rotatably arranged on the mounting base (31), one end of the pawl (33) is engaged with the ratchet wheel (32), and a snap spring is connected between the pawl (33) and the mounting base (31), and the end of the pawl (33) away from the ratchet wheel (32) is symmetrically provided with two limiting arc grooves (331), and the mounting base (31) is slidably provided with an adjusting key (35) for controlling the rotating direction of the pawl (33).

6. A torque adjustable type of ratchet (32) wrench according to claim 5, characterized in that: The adjusting key (35) comprises a through shaft (351) coaxial with the pawl (33), two pressing plates (352) respectively connected to the two ends of the through shaft (351), and two adjusting columns (353) respectively arranged on the mutually close sides of the two pressing plates (352), the two adjusting columns (353) are respectively corresponding to the same end of the two limiting arc grooves (331), when one of the pressing plates (352) is stressed, the adjusting column (353) connected therewith enters the corresponding limiting arc groove (331) and the other adjusting column (353) is out of the other limiting arc groove (331), when the adjusting column (353) slides to the other end of the limiting arc groove (331), the pawl (33) is separated from the ratchet wheel (32).

7. A torque adjustable type of ratchet (32) wrench according to claim 6, characterized in that: The mounting base (31) is symmetrically provided with two stepped clamping grooves (311) at both ends, the two pressing plates (352) are respectively slidably arranged in the two stepped clamping grooves (311), and the mutually far apart sides of the two pressing plates (352) are always below the notches of the two stepped clamping grooves (311).

8. A torque adjustable type of ratchet (32) wrench according to claim 7, characterized in that: One end of the mounting base (31) is integrally connected with a spherical joint groove (312), the end of the connecting rod (2) is integrally connected with a joint ball (22) rotatably matched in the joint groove (312), the end of the connecting rod (2) close to the joint ball (22) is a square structure, the notch of the joint groove (312) is matched with the width of the end of the connecting rod (2), and the length of the notch of the joint groove (312) is greater than the cross-sectional length of the connecting rod (2).

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