Open type ratchet wrench with fixed number of turns

Abstract

The utility model discloses a fixed-turn open type ratchet wrench, which belongs to the technical field of ratchet wrenches and comprises a wrench body and a wrench body cover. A hexagonal ratchet wheel is arranged at the open end of the wrench body; the hexagonal ratchet wheel is limited in the wrench body through the wrench body cover and can rotate relative to the wrench body; a ratchet wheel limiting device and a circle number fixing device are arranged in the wrench body. The ratchet wheel limiting device is used for limiting relative rotation of the hexagonal ratchet wheel and the wrench body in the clockwise or anticlockwise direction. And the turn number fixing device is used for limiting the turn number of the hexagonal ratchet wheel rotating relative to the wrench body. The open type ratchet wrench with the fixed number of turns can effectively solve the problems that a ratchet wrench in the prior art cannot fix the number of turns during operation, the number of turns can only be counted in a line drawing mode, efficiency is low, and the error rate is high.

Description

Technical Field

[0001] This utility model belongs to the technical field of ratchet wrenches. Specifically, it relates to a fixed-number open-end ratchet wrench. Background Technology

[0002] A ratchet wrench utilizes a ratchet mechanism that engages with a ratchet catch to achieve unidirectional rotation. When the driving element (such as a lever) swings counterclockwise, the ratchet catch pushes the ratchet to rotate clockwise; when the driving element swings clockwise, the ratchet catch slides across the back of the ratchet teeth, preventing the ratchet from rotating in the opposite direction, thus achieving unidirectional stepping motion. This design allows the hexagonal ratchet wrench to provide efficient torque output while maintaining stability.

[0003] Existing ratchet wrenches cannot fix the number of turns during operation, while the number of turns is very strict when assembling ferrule fittings in hydrogen energy equipment. Conventional wrenches can only count the number of turns by drawing lines, which is inefficient and has a high error rate. At the same time, existing ratchet wrenches cannot automatically reset, making them unsuitable for the working conditions of assembling ferrule fittings in hydrogen refueling equipment. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned shortcomings by providing a fixed-turn open-end ratchet wrench. This solves the problems of existing ratchet wrenches, which cannot fix the number of turns during operation and can only count turns by drawing lines, resulting in low efficiency and a high error rate. To achieve the above objective, this utility model provides the following technical solution:

[0005] A fixed-turn open-end ratchet wrench includes a wrench body and a wrench body cover; a hexagonal ratchet is provided at the open end of the wrench body; the hexagonal ratchet is confined within the wrench body by the wrench body cover and is rotatable relative to the wrench body; the wrench body is provided with a ratchet limiting device and a fixed-turn device; the ratchet limiting device is used to limit the relative rotation of the hexagonal ratchet and the wrench body in a clockwise or counterclockwise direction; the fixed-turn device is used to limit the number of turns of the hexagonal ratchet relative to the wrench body.

[0006] Furthermore, the ratchet limiting device includes a ratchet catch, a push block, and a push rod; the ratchet catch is fixedly connected to one side of the push block by a pin, and can rotate relative to it by the pin; the other side of the push block is fixedly connected to the push rod; the ratchet catch cooperates with the hexagonal ratchet to limit the relative rotation of the hexagonal ratchet.

[0007] Furthermore, the wrench body is provided with a push rod slide; the push rod is supported by the push rod slide and can move along the axial direction of the wrench body on the push rod slide; a compression spring is provided between the push rod and the push rod slide to give the push rod an axial force in the direction of the hexagonal ratchet, so that the ratchet lock and the hexagonal ratchet mesh with each other.

[0008] Furthermore, the end of the push rod away from the ratchet is provided with a push rod slider; the push rod slider is fixedly connected to a lever by screws; the lever is located on the outside of the wrench body.

[0009] Furthermore, the number of turns device includes a thin steel sheet and a number of turns positioning groove; the number of turns positioning groove is fixed in the wrench body; one end of the thin steel sheet is fixedly connected to a hexagonal ratchet, and the other end is connected to a number of turns positioning block; the number of turns positioning block is slidably connected in the number of turns positioning groove.

[0010] Furthermore, the thin steel sheet can be bent into a circle following the relative rotation of the hexagonal ratchet.

[0011] Furthermore, a tension spring is provided at the end of the number of turns positioning block away from the hexagonal ratchet, providing an axial force in the opposite direction to the hexagonal ratchet.

[0012] Furthermore, the tension spring is fixed to the wrench body by a spring retainer; the tension spring is arranged parallel to the push rod.

[0013] Furthermore, the wrench body has a waist hole of the same length on one side corresponding to the number of turns positioning groove; the waist hole is provided with an adjustment knob; the adjustment knob can be slidable by sliding on the waist hole to adjust the distance that the number of turns positioning block can slide.

[0014] Furthermore, the waist hole is provided with a rotation scale; the rotation scale represents the specific number of rotations that the hexagonal ratchet can rotate relative to each other.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model provides a fixed number of turns open-type ratchet wrench, which uses a thin steel sheet, a number of turns positioning groove and a number of turns positioning block to control the relative number of turns of the hexagonal ratchet connected to the thin steel sheet by limiting the movement distance of the number of turns positioning block, thereby achieving a fixed number of turns, with high efficiency and low error rate;

[0017] 2. This utility model provides a fixed number of turns open-type ratchet wrench, which controls the ratchet lock to separate from the hexagonal ratchet by setting a toggle block, and provides a return force by a tension spring at the rear end of the number of turns positioning block. When the hexagonal ratchet is unlocked, it is pulled by the tension spring to complete the reset. Attached Figure Description

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

[0019] Figure 2 yes Figure 1 A sectional view along the AA direction;

[0020] Figure 3 yes Figure 1 Oblique view;

[0021] In the attached diagram: 1. Wrench body; 2. Wrench body cover; 3. Hexagonal ratchet; 4. Ratchet catch; 5. Push block; 6. Push rod; 7. Push rod slide; 8. Compression spring; 9. Push rod slider; 10. Pulley; 11. Thin steel sheet; 12. Number of turns positioning groove; 13. Number of turns positioning block; 14. Tension spring; 15. Spring retainer. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example:

[0025] See attached Figures 1-3A fixed-turn open-end ratchet wrench includes a wrench body 1 and a wrench body cover 2. The open end of the wrench body 1 is used to engage a screw, and the operator swings the wrench body 1 to tighten the screw. A hexagonal ratchet 3 is provided inside the open end of the wrench body 1, and is confined within the wrench body 1 by the wrench body cover 2. The hexagonal ratchet 3 can rotate freely relative to the wrench body 1, and its connection method is well known to those skilled in the art and will not be described in detail here. A ratchet limiting device is provided inside the wrench body 1, limiting the rotation of the hexagonal ratchet 3 relative to the wrench body 1 in one direction, either clockwise or counterclockwise. When engaged with a screw, when rotating in one direction, the hexagonal ratchet 3 rotates integrally with the wrench body 1 to lock or unlock the screw. When rotating in the other direction, the hexagonal ratchet 3 moves relative to the wrench body 1. That is, the wrench body 1 can achieve intermittent unidirectional stepping during operation, which is particularly suitable for confined spaces or hard-to-reach work areas. It can flexibly adjust the usage angle to meet the needs of different working environments. The ratchet limiting device includes a ratchet catch 4, which engages with a hexagonal ratchet 3, matching the action of the pawl and ratchet. The other side of the ratchet catch 4 is connected to a push block 5 via a pin. The pin allows the ratchet catch 4 to rotate a certain range relative to the push block 5, providing sufficient space for better engagement between the ratchet catch 4 and the hexagonal ratchet 3. A push rod 6 is fixedly connected to the other end of the push block 5. The push rod 6 is supported within the wrench body 1 by a push rod slide 7, and can drive the ratchet catch 4 to slide along the axial direction of the wrench body 1 on the push rod slide 7, thus engaging or disengaging with the hexagonal ratchet 3. Two push rod slides 7 are provided, located at opposite ends inside the wrench body 1, providing good support. A compression spring 8 is provided between the push rod 6 and the push rod slide 7 closest to the ratchet catch 4. The compression spring 8, facing the push rod slide 7 along the direction of the ratchet catch 4, consistently provides an axial force towards the hexagonal ratchet 3 to ensure engagement.

[0026] A number-turn device is provided inside the wrench body 1, which can control the number of turns of the hexagonal ratchet 3 relative to the wrench body 1. This allows for fixing the number of turns during the assembly of the hydrogen energy equipment ferrule connector, eliminating the need to determine the assembly turn count by marking lines. It includes a thin steel sheet 11 and a turn-counting groove 12. The thin steel sheet 11 is flexible, with one end fixedly mounted on the hexagonal ratchet 3, bending into a circle as the hexagonal ratchet 3 rotates. The other end of the thin steel sheet 11 is fixedly connected to a turn-counting block 13. The turn-counting groove 12 is located on one side inside the wrench body 1. The turn-counting block 13 is slidably connected to the turn-counting groove 12 and can slide freely within it. The length of the turn-counting groove 12 is the movable length of the thin steel sheet 11. By calculating the number of turns of the hexagonal ratchet 3, the movable length of the thin steel sheet 11 corresponding to the number of turns of the hexagonal ratchet 3 can be determined, thus setting the length of the turn-counting groove 12.

[0027] Furthermore, a rotation scale is provided on the rotation positioning groove 12, with the distance that the thin steel sheet 11 moves driven by each half-turn relative rotation of the hexagonal ratchet 3 as a unit. In other embodiments, different distance units can be further adjusted. In this embodiment, half a turn is used as the unit. The rotation scale can intuitively and clearly convert the length of the thin steel sheet 11 movement into the number of rotations of the hexagonal ratchet 3.

[0028] To further adapt to different rotation counts under various working conditions, a waist hole of equal length is provided on the wrench body 1 corresponding to the rotation count positioning groove 12. An adjustment knob is located on the waist hole. The part of the adjustment knob outside the wrench body 1 is for the operator to slide, while the part inside the rotation count positioning groove 12 is located on the side of the rotation count positioning block 13 away from the hexagonal ratchet 3. The rotation count scale is also correspondingly set at the position of the waist hole. By sliding the adjustment knob to the corresponding scale position, the relative rotation count of the hexagonal ratchet 3 can be adjusted. The part of the adjustment knob that contacts the waist hole can be made into a flexible short rod, which is fixed by the friction between it and the waist hole. When sliding adjustment is needed, external force is used, or the adjustment knob can be fixed by the thumb during operation.

[0029] A tension spring 14 is provided on the side of the number of turns positioning block 13 away from the hexagonal ratchet 3. The other end of the tension spring 14 is fixed to one side of the wrench body 1 by a spring retainer 15, which provides an axial force to the number of turns positioning block 13 opposite to the side facing the hexagonal ratchet 3. A push rod slider 9 is provided on the side of the push rod 6 away from the ratchet catch 4. It slides in the wrench body 1 as the push rod 6 moves. The push rod slider 9 is fixedly connected to a lever 10 by screws. A part of the lever 10 is located on the outside of the wrench body 1. By moving the lever 10, the push rod 6 is moved, thereby causing the ratchet catch 4 to separate from the hexagonal ratchet 3.

[0030] The specific operation process of this utility model is as follows: (see attached) Figure 1As shown, at this time, the number of turns positioning block 13 is located at the rear end of the number of turns positioning groove 12. The connection position of the thin steel sheet 11 and the hexagonal ratchet 3 does not interfere with the opening of the wrench body 1. At this time, it can be used to cooperate with the target screw from the same height through the opening and confirm the initial position of the wrench body 1. Since the target screw has already made preliminary cooperation with the mounting hole position before tightening, rotate the wrench body 1 in the opposite direction of tightening. The hexagonal ratchet 3 and the wrench body 1 have relative movement. The thin steel sheet 11 bends and drives the number of turns positioning block 13 to move a certain distance. Then rotate the wrench body 1 in the tightening direction to the initial position. During this process, the ratchet 4 is engaged and fixed with the hexagonal ratchet 3. The hexagonal ratchet 3 and the wrench body 1 rotate together and no longer rotate relative to each other, driving the screw to tighten. Then repeat the operation of rotating in the opposite direction until there is a certain resistance when rotating in the opposite direction, that is, the number of turns positioning block 13 has moved to the front end of the number of turns positioning groove 12 and cannot move anymore. At this time, rotate it in the tightening direction to the initial position to complete the locking of the fixed number of turns. After locking is complete, remove the wrench body 1, and move the lever 10 to disengage the ratchet lock 4 from the hexagonal ratchet 3. The tension of the spring 14 causes the number of turns positioning block 13 to return to the rear end of the number of turns positioning groove 12. Release the lever 10, and the force of the compression spring 8 causes the ratchet lock 4 to engage with the hexagonal ratchet 3, completing the reset and allowing for the next locking of the fixed number of turns. The arc length of the ratchet lock 4 is greater than the arc length of the opening of the hexagonal ratchet 3, ensuring that in the working state (not during the reset operation), the ratchet lock 4 and the hexagonal ratchet 3 are always partially engaged.

[0031] When adjusting the slider to a fixed number of turns, the thin steel sheet 11 may block the opening of the wrench body 1. In this case, the engagement with the screw needs to be done from above the screw downwards. The tightening process is the same as the above operation.

[0032] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A fixed-number-turn open-end ratchet wrench, characterized in that: The device includes a wrench body (1) and a wrench body cover (2); the wrench body (1) has an open end with a hexagonal ratchet (3); the hexagonal ratchet (3) is confined within the wrench body (1) by the wrench body cover (2) and can rotate relative to the wrench body (1); the wrench body (1) is provided with a ratchet limiting device and a number of rotations device; the ratchet limiting device is used to limit the relative rotation of the hexagonal ratchet (3) and the wrench body (1) in the clockwise or counterclockwise direction; the number of rotations device is used to limit the number of rotations of the hexagonal ratchet (3) relative to the wrench body (1).

2. A fixed-turn open-end ratchet wrench according to claim 1, characterized in that: The ratchet limiting device includes a ratchet catch (4), a push block (5), and a push rod (6); the ratchet catch (4) is fixedly connected to one side of the push block (5) by a pin, and can rotate relative to each other by the pin; the other side of the push block (5) is fixedly connected to the push rod (6); the ratchet catch (4) cooperates with the hexagonal ratchet (3) to limit the relative rotation of the hexagonal ratchet (3).

3. A fixed-turn open-end ratchet wrench according to claim 2, characterized in that: The wrench body (1) is provided with a push rod slide (7); the push rod (6) is supported by the push rod slide (7) and can move along the axial direction of the wrench body (1) on the push rod slide (7); a compression spring (8) is provided between the push rod (6) and the push rod slide (7) to give the push rod (6) an axial force in the direction of the hexagonal ratchet (3), so that the ratchet catch (4) and the hexagonal ratchet (3) mesh with each other.

4. A fixed-turn open-end ratchet wrench according to claim 3, characterized in that: The push rod (6) has a push rod slider (9) at the end away from the ratchet (4); the push rod slider (9) is fixedly connected to a lever (10) by screws; the lever (10) is located on the outside of the wrench body (1).

5. A fixed-turn open-end ratchet wrench according to claim 4, characterized in that: The number of turns device includes a thin steel sheet (11) and a number of turns positioning groove (12); the number of turns positioning groove (12) is fixed inside the wrench body (1); one end of the thin steel sheet (11) is fixedly connected to a hexagonal ratchet (3), and the other end is connected to a number of turns positioning block (13); the number of turns positioning block (13) is slidably connected inside the number of turns positioning groove (12).

6. A fixed-turn open-end ratchet wrench according to claim 5, characterized in that: The thin steel sheet (11) can bend into a circle following the relative rotation of the hexagonal ratchet (3).

7. A fixed-turn open-end ratchet wrench according to claim 6, characterized in that: The end of the number of turns positioning block (13) away from the hexagonal ratchet (3) is provided with a tension spring (14) to provide an axial force in the opposite direction to the hexagonal ratchet (3).

8. A fixed-turn open-end ratchet wrench according to claim 7, characterized in that: The tension spring (14) is fixed inside the wrench body (1) by a spring retainer (15); the tension spring (14) is arranged parallel to the push rod (6).

9. A fixed-turn open-end ratchet wrench according to claim 8, characterized in that: The wrench body (1) has a waist hole of the same length on one side corresponding to the number of turns positioning groove (12); the waist hole is provided with an adjustment knob; the adjustment knob can adjust the sliding distance of the number of turns positioning block (13) by sliding on the waist hole.

10. A fixed-number open-end ratchet wrench according to claim 9, characterized in that: The waist hole is provided with a rotation scale; the rotation scale represents the specific number of rotations that the hexagonal ratchet (3) can rotate relative to each other.

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