High-precision ratchet wrench with multiple tooth numbers

Abstract

The high-precision ratchet wrench comprises a handle body head, a central mounting hole is formed in the middle of the top face of the handle body head, a ratchet head is inserted in the central mounting hole in a sleeved mode, and a first outer tooth portion and a second outer tooth portion which correspond to each other up and down are formed on the outer side wall of the ratchet head. A first pawl block and a second pawl block which are stacked up and down are inserted in the lower adjusting groove in a sleeved mode, the front wall face of the first pawl block and the front wall face of the second pawl block are arc-shaped wall faces, tooth-shaped parts are formed on the arc-shaped wall faces, and the tooth-shaped parts are matched with the corresponding first outer tooth parts or the corresponding second outer tooth parts. Each tooth of the tooth-shaped portion is half of the corresponding first outer tooth portion or second outer tooth portion. Each tooth of the tooth-shaped part of the first pawl block and the tooth-shaped part of the second pawl block is half of the corresponding first outer tooth part or the corresponding second outer tooth part, so that 240 teeth are achieved, the minimum rotation angle reaches 1.5 degrees, and the precision is higher.

Description

Technical fields:

[0001] This utility model relates to the field of fastener tool and equipment technology, and more specifically to a high-precision ratchet wrench with multiple teeth. Background technology:

[0002] Existing ratchet wrenches typically have 90 teeth and a minimum rotation angle of 4°, making them unsuitable for tightening bolts in smaller spaces, thus limiting their effectiveness. Therefore, a high-precision, high-torque ratchet wrench, as described in Chinese patent application number 202222218274.0, features a first and second external tooth section on the outer wall of the ratchet head. These teeth are staggered, ensuring the total number of teeth for rotation is equal to the sum of the number of teeth on the first and second external tooth sections. This design maintains high torque while improving rotational accuracy, significantly expanding its application range. It is suitable for use in confined spaces, offering good performance and a long lifespan. While both the first and second external tooth sections have 90 teeth (equivalent to 180 teeth), the minimum rotation angle of 2° is still insufficient for some smaller operating areas, and currently, there are no ratchet wrenches with even smaller rotation angles.

[0003] Meanwhile, the first and second external teeth of its ratchet head have 90 teeth, which makes it difficult to process and reduces the hardness of the teeth, thus reducing its service life. Utility Model Content:

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-precision ratchet wrench with multiple teeth. Each tooth of the toothed portion of the first and second pawl blocks is half of the corresponding first or second external tooth portion, thereby achieving 240 teeth. Its minimum rotation angle reaches 1.5°, which is more precise and suitable for use in environments with smaller operating ranges. Moreover, its processing difficulty is reduced, the strength of the teeth is increased, and its service life is improved.

[0005] The solution of this utility model to the aforementioned technical problem is:

[0006] A high-precision ratchet wrench with multiple teeth includes a handle head. A central mounting hole is formed in the center of the top surface of the handle head. A rearwardly extending lower adjustment groove is formed on the inner sidewall of the rear portion of the central mounting hole. An upwardly extending mounting through hole is formed on the bottom rear surface of the handle head, communicating with the lower adjustment groove. The center and rear portions of the mounting through hole are located behind the lower adjustment groove. A ratchet head is inserted into the central mounting hole. Corresponding upper and lower first and second external teeth are formed on the outer sidewall of the ratchet head. The first external tooth is positioned directly above the center of the corresponding tooth groove of the second external tooth, and the second external tooth is positioned directly below the center of the corresponding tooth groove of the first external tooth. The lower adjusting groove contains a first pawl block and a second pawl block stacked vertically. The front wall of the first pawl block and the second pawl block is an arc-shaped wall, and tooth-shaped parts are formed on the arc-shaped wall. The tooth-shaped parts cooperate with the corresponding first external tooth or second external tooth, and each tooth of the tooth-shaped part is half of the corresponding first external tooth or second external tooth.

[0007] The number and size of the teeth in the first and second external teeth are the same, and the size of the teeth in the toothed parts of the first and second pawl blocks is the same.

[0008] The vertical column of the steering gear is inserted into the mounting through hole. Two corresponding side mounting through holes are formed on the front side wall of the vertical column. Two hollow positioning pins are inserted into the two side mounting through holes. A buffer spring is inserted into the side mounting through hole. The rear end of the buffer spring is pressed against the inner end face of the side mounting through hole. The buffer spring is inserted into the hollow positioning pin. The front end of the buffer spring is pressed against the inner side wall of the front end of the hollow positioning pin. The front end of the hollow positioning pin extends out of the side mounting through hole and is located in the lower adjustment groove. It is inserted into the central groove formed in the middle of the rear wall of the first pawl block or the second pawl block. The inner wall of the central groove is an arc-shaped wall. The front wall of the hollow positioning pin is a spherical wall. It presses against the inner wall of the corresponding central groove.

[0009] The first external tooth is located above the second external tooth, the first pawl block is located above the second pawl block, the first external tooth corresponds to the first pawl block, and the second external tooth corresponds to the second pawl block.

[0010] The inner walls on the left and right sides of the lower adjustment groove are arc-shaped, and the left and right side walls of the first pawl block and the second pawl block cooperate with the arc-shaped walls of the lower adjustment groove.

[0011] The top surface of the ratchet head has a cylindrical transition portion extending vertically upward, and the top surface of the cylindrical transition portion has a square connecting head.

[0012] The rear end of the handle head is formed with a rearwardly extending portion.

[0013] The steering gear includes a bottom rotating part, the front top surface of which is formed with a vertical column, and the rear wall of the vertical column is in close contact with the inner side wall of the mounting through hole; a rearwardly extending groove is formed on the bottom surface of the handle head at the bottom of the mounting through hole, the rear part of the bottom rotating part is located in the groove, and the rear top surface of the bottom rotating part presses against the top surface of the groove.

[0014] The top surface of the handle head is formed with a waist-shaped groove. The central mounting hole, the lower adjustment groove, and the mounting through hole are all located at the bottom of the waist-shaped groove. The cover plate is inserted into the waist-shaped groove, and the bottom surface of the cover plate presses against the bottom surface of the waist-shaped groove. The cover plate is fixedly connected to the handle head by bolts. The spring washer is inserted into the cylindrical transition part, which is clamped between the edge of the top surface of the cover plate and the ratchet head. The cylindrical transition part is inserted into the central through hole of the cover plate, and its top surface extends out of the top of the central through hole of the cover plate.

[0015] The first and second external teeth are each composed of 60 teeth, and the teeth of the first and second external teeth are staggered and correspond to each other.

[0016] The outstanding effect of this utility model is:

[0017] Compared with existing technologies, it sets a first external tooth and a second external tooth on the outer wall of the ratchet head. The teeth of the first external tooth and the second external tooth are staggered and correspond to each other, so that the number of rotating teeth is the sum of the number of teeth of the first external tooth and the second external tooth. At the same time, each tooth of the toothed part of the first pawl block and the second pawl block is half of the corresponding first external tooth or second external tooth, thus achieving 240 teeth. Its minimum rotation angle reaches 1.5°, which is more precise and can be used in environments with smaller operating ranges. Moreover, both the first external tooth and the second external tooth have 60 teeth, which reduces the processing difficulty, increases the strength of the teeth, and improves the service life. Attached image description:

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a partial structural diagram of the angle-changing part of this utility model;

[0020] Figure 3 This is an exploded view of the present invention;

[0021] Figure 4 This is a partial sectional view of the present invention;

[0022] Figure 5 This is a partial cross-sectional view of the present invention from a different angle;

[0023] Figure 6 This is a simplified diagram showing the engagement of the first external tooth and the first pawl block.

[0024] Figure 7 This is a simplified diagram showing the engagement of the second external tooth and the second pawl block.

[0025] Figure 8 yes Figure 6 and Figure 7 A simplified diagram showing the overlap.

[0026] Figure 9 This is a partial structural diagram of the present invention in use;

[0027] Figure 10 This is a schematic diagram illustrating a failure situation when the number of teeth on the first and second pawl blocks are the same. Detailed implementation method:

[0028] For example, see below. Figures 1 to 9 As shown, a high-precision ratchet wrench with multiple teeth includes a handle head 10. A central mounting hole 11 is formed in the center of the top surface of the handle head 10. A rearwardly extending lower adjustment groove 12 is formed on the inner sidewall of the rear part of the central mounting hole 11. An upwardly extending mounting through hole 13 is formed on the bottom rear surface of the handle head 11, communicating with the lower adjustment groove 12. The middle and rear parts of the mounting through hole 13 are located behind the lower adjustment groove 12. A ratchet head 20 is inserted into the central mounting hole 11. A first external tooth portion 21 and a second external tooth portion 22, corresponding vertically, are formed on the outer sidewall of the ratchet head 20. The teeth of the first external tooth portion 21... The tooth of the second external tooth 22 is located directly above the center of the corresponding tooth groove 1 of the first external tooth 21, and the tooth of the second external tooth 22 is located directly below the center of the corresponding tooth groove 1 of the first external tooth 21. That is, the tooth grooves 1 of the first external tooth 21 and the second external tooth 22 are staggered vertically. The lower adjustment groove 12 is fitted with the first pawl block 30 and the second pawl block 40 stacked vertically. The front wall surface of the first pawl block 30 and the second pawl block 40 is an arc-shaped wall surface. The arc-shaped wall surface is formed with tooth-shaped parts 31. The tooth-shaped parts 31 cooperate with the corresponding first external tooth 21 or the second external tooth 22. Each tooth of the tooth-shaped parts 31 is half of the corresponding first external tooth 21 or the second external tooth 22.

[0029] Furthermore, the number and size of the teeth of the first external tooth portion 21 and the second external tooth portion 22 are the same, and the size of the teeth of the toothed portion 31 of the first pawl block 30 and the second pawl block 40 is the same.

[0030] Furthermore, the vertical column 51 of the steering gear 50 is inserted into the mounting through hole 13. Two corresponding side mounting through holes 52 are formed on the front side wall of the vertical column 51. Two hollow positioning pins 53 are inserted into the two side mounting through holes 52. A buffer spring 54 is inserted into the side mounting through hole 52. The rear end of the buffer spring 54 is pressed against the inner end face of the side mounting through hole 52. The buffer spring 54 is inserted into the hollow positioning pin 53. The front end of the buffer spring 54 is pressed against the inner side wall of the front end of the hollow positioning pin 53. The front end of the hollow positioning pin 53 extends out of the side mounting through hole 52 and is located in the lower adjustment groove 12. It is inserted into the central groove 32 formed in the middle of the rear wall of the first pawl block 30 or the second pawl block 40. The inner wall of the central groove 32 is an arc-shaped wall, and the front wall of the hollow positioning pin 53 is a spherical wall. It presses against the inner wall of the corresponding central groove 32.

[0031] Furthermore, the first external tooth 21 is located above the second external tooth 22, the first pawl block 30 is located above the second pawl block 40, the first external tooth 21 corresponds to the first pawl block 30, and the second external tooth 22 corresponds to the second pawl block 40.

[0032] Furthermore, the inner walls on the left and right sides of the lower adjustment groove 12 are arc-shaped walls, and the left and right side walls of the first pawl block 30 and the second pawl block 40 cooperate with the arc-shaped walls of the lower adjustment groove 12.

[0033] Furthermore, the top surface of the ratchet head 20 has a cylindrical transition portion 24 extending vertically upward, and the top surface of the cylindrical transition portion 24 has a square connecting head 25.

[0034] Furthermore, the rear end of the handle head 10 is formed with a rearwardly extending portion.

[0035] Furthermore, the steering gear 50 includes a bottom rotating part 55, and a vertical column 51 is formed on the front top surface of the bottom rotating part 55. The rear wall of the vertical column 51 is in close contact with the inner side wall of the mounting through hole 13. A rearwardly extending groove is formed on the bottom surface of the handle head 10 at the bottom of the mounting through hole 13. The rear part of the bottom rotating part 55 is located in the groove, and the rear top surface of the bottom rotating part 55 presses against the top surface of the groove.

[0036] Furthermore, the top surface of the handle head 10 is formed with a waist-shaped groove 15. The central mounting hole 11, the lower adjustment groove 12, and the mounting through hole 13 are all located at the bottom of the middle of the waist-shaped groove 15. The cover plate 60 is inserted into the waist-shaped groove 15, and the bottom surface of the cover plate 60 presses against the bottom surface of the waist-shaped groove 15. The cover plate 60 is fixedly connected to the handle head 10 by bolts. The spring washer 9 is inserted into the cylindrical transition part 24, which is clamped between the top edge of the cover plate 60 and the ratchet head 20. The cylindrical transition part is inserted into the middle through hole of the cover plate 60, and its top surface extends out of the top of the middle through hole of the cover plate 60. The outer side wall of the cylindrical transition part 24 is close to the inner side of the spring washer 9, and its outer side wall is also close to the inner side wall of the middle through hole of the cover plate 60.

[0037] The elastic shim 9 causes the bottom surface of the ratchet head 20 to press against the bottom end face of the central mounting hole 11, while its top end presses against the bottom surface of the elastic shim 9. The top end of the elastic shim 9 elastically presses against the bottom surface of the cover plate 60. This structure improves the horizontal rotation of the ratchet head 20 and makes the horizontal rotation more stable, ensuring normal use in this embodiment. Of course, the added elastic shim 9 increases the resistance to the rotation of the ratchet head 20, but grease is added between the ratchet head 20 and the central mounting hole 11 during installation to reduce friction and improve normal operation. Therefore, the resistance to the rotation of the ratchet head 20 increased by the elastic shim 9 is very small and can be basically ignored.

[0038] Furthermore, both the first external tooth portion 21 and the second external tooth portion 22 are composed of 60 teeth, and the teeth of the first external tooth portion 21 and the second external tooth portion 22 are staggered and correspond to each other.

[0039] Since both the first external toothed portion 21 and the second external toothed portion 22 have 60 teeth, the machining difficulty of the first external toothed portion 21 and the second external toothed portion 22 is greatly reduced, and the strength of the teeth is also guaranteed. Each tooth of the toothed portion 31 of the first pawl block 30 and the second pawl block 40 is half of the corresponding first external toothed portion 21 or second external toothed portion 22, which makes this embodiment achieve 240 teeth. Its minimum rotation angle reaches 1.5°, which is more accurate and can be used in environments with smaller operating ranges.

[0040] like Figures 6 to 8As shown, in this embodiment, during use, the vertical column 51 is rotated by manually rotating the rear part of the bottom rotating part 55 of the steering gear 50. This rotation, via the hollow positioning pin 53, moves the first pawl block 30 and the second pawl block 40 to the left or right along the arc-shaped wall of the lower adjusting groove 13. After being moved into position, the toothed part 31 of the first pawl block 30 or the second pawl block 40 engages with the corresponding first external toothed part 21 or the second external toothed part 22 (the corresponding teeth of the first external toothed part 21 or the second external toothed part 22 are inserted into the corresponding tooth grooves of the first pawl block 30 or the second pawl block 40). Specifically, the toothed part 31 of the first pawl block 30 engages with the corresponding teeth of the first external toothed part 21. The first pawl block 30 has two teeth, one of which is engaged with the other, and the other of which is engaged with the corresponding teeth of the second external tooth 22. In the first pawl block 30, the toothed portion 31 of the first pawl block 40 is engaged with the corresponding teeth of the second external tooth 22, but the toothed portion 31 of the first pawl block 30 is not fully engaged with the corresponding teeth of the first external tooth 21. In both cases, since each tooth of the toothed portion 31 is half of the corresponding first external tooth 21 or second external tooth 22, the rotation angle is smaller when they are engaged. The first external tooth 21 and the second external tooth 22 both have 60 teeth, and each tooth of the toothed portion 31 is half of the corresponding first external tooth 21 or second external tooth 22, that is, the minimum turning angle is 1.5°.

[0041] At this time, when the ratchet head 20 is rotated, the part where the first external tooth 21 was not fully engaged with the toothed part 31 of the corresponding first pawl block 30 engages, and the part where the second external tooth 22 was engaged with the toothed part 31 of the corresponding second pawl block 40 partially disengages, achieving incomplete engagement. The turning angle at this time is 1.5°, which allows it to rotate and tighten the bolt in a smaller space, thus expanding its application range. Similarly, in another case, the part where the first external tooth 21 was fully engaged with the toothed part 31 of the corresponding first pawl block 30 disengages, achieving incomplete engagement, and the part where the second external tooth 22 was not fully engaged with the toothed part 31 of the corresponding second pawl block 40 fully engages.

[0042] Meanwhile, in this embodiment, the teeth of the toothed portion 31 of the first pawl block 30 and the second pawl block 40 are the same size, but the number of teeth is different. In this embodiment, the number of teeth of the first pawl block 30 is less than the number of teeth of the toothed portion 31 of the second pawl block 40, that is, the second pawl block 40 is also larger than the first pawl block 30. Figures 6 to 9 As shown, the number of teeth on the toothed portion 31 of the first pawl block 30 and the second pawl block 40 is different, such as... Figure 9 As shown, the second pawl block 40 first rests against the corresponding side wall of the lower adjustment groove 12, while the first pawl block 30 is suspended. During operation, the first pawl block 30 first rests against the wall, and when it is released, the second pawl block 40 rests against the wall, thus achieving alternating rest.

[0043] When the number of teeth of both is the same, such as Figure 10 As shown, the first pawl block 30 and the second pawl block 40 may overlap. In this case, the alternating locking effect of the first pawl block 30 and the second pawl block 40 cannot be achieved, resulting in a failure.

[0044] Therefore, in this embodiment, the size of the teeth of the toothed portion 31 of the first pawl block 30 and the second pawl block 40 is the same, but the number of teeth is different, so as to ensure alternating locking. In this embodiment, if the first external toothed portion 21 and the second external toothed portion 22 both have 90 teeth, and each tooth of the toothed portion 31 of the first pawl block 30 and the second pawl block 40 is half of the corresponding first external toothed portion 21 or second external toothed portion 22, a significant improvement in accuracy can be achieved.

[0045] Finally, the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model, and the patent protection scope of the present utility model should be defined by the claims.

Claims

1. A high-precision ratchet wrench with multiple teeth, comprising a handle head (10), wherein a central mounting hole (11) is formed in the middle of the top surface of the handle head (10), a rearwardly extending lower adjustment groove (12) is formed in the inner sidewall of the rear part of the central mounting hole (11), and an upwardly extending mounting through hole (13) is formed in the bottom rear part of the handle head (11), the mounting through hole (13) communicating with the lower adjustment groove (12), and the middle and rear parts of the mounting through hole (13) are respectively... Behind the lower adjusting groove (12), the ratchet head (20) is inserted into the central mounting hole (11). The outer wall of the ratchet head (20) is formed with a first external tooth (21) and a second external tooth (22) corresponding to each other. The teeth of the first external tooth (21) are directly above the center of the corresponding tooth groove (1) of the second external tooth (22), and the teeth of the second external tooth (22) are directly below the center of the corresponding tooth groove (1) of the first external tooth (21). The characteristic feature is that: The lower adjustment groove (12) is fitted with a first pawl block (30) and a second pawl block (40) stacked vertically. The front wall of the first pawl block (30) and the second pawl block (40) is an arc-shaped wall, and a toothed part (31) is formed on the arc-shaped wall. The toothed part (31) cooperates with the corresponding first external toothed part (21) or second external toothed part (22). Each tooth of the toothed part (31) is half of the corresponding first external toothed part (21) or second external toothed part (22).

2. A high-precision ratchet wrench with multiple teeth as described in claim 1, characterized in that: The number and size of the teeth of the first external toothed portion (21) and the second external toothed portion (22) are the same, and the size of the teeth of the toothed portion (31) of the first pawl block (30) and the second pawl block (40) are the same.

3. A high-precision ratchet wrench with multiple teeth as described in claim 1, characterized in that: The vertical column (51) of the steering gear (50) is inserted into the mounting through hole (13). Two corresponding side mounting through holes (52) are formed on the front side wall of the vertical column (51). Two hollow positioning pins (53) are inserted into the two side mounting through holes (52). A buffer spring (54) is inserted into each side mounting through hole (52). The rear end of the buffer spring (54) rests against the inner end face of the side mounting through hole (52). The buffer spring (54) is inserted into the hollow positioning pin (53). The front end of (54) is pressed against the inner side wall of the front end of the hollow positioning pin (53). The front end of the hollow positioning pin (53) extends outward and is installed in the through hole (52) and is located in the lower adjustment groove (12). It is inserted into the central groove (32) formed in the middle of the rear wall of the first pawl block (30) or the second pawl block (40). The inner wall of the central groove (32) is an arc-shaped wall, and the front end wall of the hollow positioning pin (53) is a spherical wall. It presses against the inner wall of the corresponding central groove (32).

4. A high-precision ratchet wrench with multiple teeth as described in claim 1, characterized in that: The ratchet head (20) has a cylindrical transition portion (24) extending vertically upward at the center of its top surface, and a square connecting head (25) is formed at the center of the top surface of the cylindrical transition portion (24).

5. A high-precision ratchet wrench with multiple teeth as described in claim 1, characterized in that: The steering gear (50) includes a bottom rotating part (55), the front top surface of the bottom rotating part (55) is formed with a vertical column (51), the rear wall surface of the vertical column (51) is in close contact with the inner side wall of the mounting through hole (13); the bottom surface of the handle head (10) at the bottom of the mounting through hole (13) is formed with a rearwardly extending groove, the rear part of the bottom rotating part (55) is in the groove, and the rear top surface of the bottom rotating part (55) presses against the top surface of the groove.

6. A high-precision ratchet wrench with multiple teeth as described in claim 1, characterized in that: The top surface of the handle head (10) is formed with a waist-shaped groove (15). The central mounting hole (11), the lower adjustment groove (12) and the mounting through hole (13) are all located at the bottom of the waist-shaped groove (15). The cover plate (60) is inserted into the waist-shaped groove (15) and is fixedly connected to the handle head (10) by bolts. The spring washer (9) is inserted into the cylindrical transition part (24) and is clamped between the cover plate (60) and the edge of the top surface of the ratchet head (20). The cylindrical transition part (9) is inserted into the central through hole of the cover plate (60) and its top surface extends out of the top of the central through hole of the cover plate (60).

7. A high-precision ratchet wrench with multiple teeth as described in claim 1, characterized in that: The first external toothed portion (21) and the second external toothed portion (22) are each composed of 60 teeth, and the teeth of the first external toothed portion (21) and the second external toothed portion (22) are staggered and correspond to each other.

Images