Ratchet wrench
By designing a ratchet wrench with a simple structure and compact size, the problem of inconvenience of operating small-sized screws or nuts in a narrow space is solved, and torque measurement is achieved to ensure the appropriate tightness of the nut.
Patent Information
- Application Number
- CN202510489007.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2025-05-30
AI Technical Summary
Existing tools are inconvenient to operate small-sized screws or nuts in a narrow space, and cannot effectively measure torque, making it difficult to control the tightness of the nut.
A simple structure and compact ratchet wrench is designed, including ratchets, pawls and handles. The pawls can swing left and right to control the forward and reverse rotation of the ratchet, equipped with springs and marbles to assist positioning, and a torsion bar is provided in the handle to measure torque.
It realizes convenient operation and measurement of torque in a narrow space, ensures the appropriate tightness of the nut, and avoids misoperation and excessive or too small torque.
Smart Images
Figure CN120056027A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a tool for tightening or loosening screws or nuts in a narrow space and capable of measuring torque, especially for maxillofacial surgery. Background Art
[0002] Currently, when tightening small-sized screws or nuts in a narrow space, such as the nuts used for mandibular fracture fixation, there is only a small fixed wrench, which is extremely inconvenient to operate and use. After the wrench rotates an angle, it is necessary to remove the wrench from the nut, change the angle, and then insert it into the nut for the next tightening. Usually, this operation needs to be performed multiple times to achieve the tightening purpose, which is time-consuming and laborious. At the same time, when tightening the nut, if the torque is too large, the thread will be damaged; if the torque is too small, the fractured bone will become loose. Therefore, it is best to be able to measure the torque when using the wrench to ensure that the tightness of the nut is appropriate. However, the existing ratchet torque wrenches are large in size and complex in structure, and are only for common large-sized screws or nuts and cannot be used in small spaces. Summary of the Invention
[0003] The main object of the present invention is to provide a ratchet wrench with a simple structure, small size, convenient to use in a small space, and having a torque measurement function at the same time. Its structure is novel, small in size, and convenient and fast to operate.
[0004] To achieve the above object, the ratchet wrench provided by the present invention includes a ratchet, a pawl, and a handle. The ratchet is located at the top of the wrench, and a pawl is installed below the ratchet; on each of the left and right sides of the lower part of the pawl, there is an arc surface; in the middle of the upper part of the pawl, there is a concave surface, and on the left and right sides respectively, there are left and right ratchet teeth, and both the left and right ratchet teeth can engage with the ratchet; a spring is fixedly installed below the pawl, and a ball is clamped between the top of the spring and the arc surface, and the left and right swing of the pawl can control the forward and reverse rotation of the ratchet.
[0005] Optionally, the handle has a hollow structure, and a torque rod is arranged in the middle of the handle.
[0006] Optionally, the spring is arranged in a groove.
[0007] Optionally, a handle is arranged at the tail end of the torque rod for easy operation.
[0008] Optionally, the ratchet wrench can be adapted to different specifications of sleeves.
[0009] The ratchet wrench proposed by the embodiment of the present invention has a novel and simple structure, small size, can be used in a narrow space, prevents misoperation, and can measure the torque at the same time to ensure the best tightness of the nut. Brief Description of the Drawings
[0010] Figure 1Schematic diagram annotation for embodiments of the present invention: 1 - ratchet wheel, 2 - ratchet pawl, 3 - handle, 4 - torsion bar, 21 - arc surface, 22 - concave surface, 23 - left ratchet teeth, 24 - right ratchet teeth, 5 - spring, 6 - ball, 7 - groove, 8 - torque compliance position Detailed implementation manners
[0011] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0012] As mentioned above, only the preferred specific implementation manners of the present invention are described, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
[0013] The schematic diagram of the embodiment of the ratchet wrench of the present invention is as Figure 1 shown, including a ratchet wheel 1, a ratchet pawl 2 and a handle 3. The ratchet wheel 1 is located at the top of the wrench, and the ratchet pawl 2 is installed below the ratchet wheel 1. There is an arc surface 21 on each of the left and right sides of the lower part of the ratchet pawl 2; the middle of the upper part of the ratchet pawl is a concave surface 22, and the left and right sides are respectively provided with left ratchet teeth 23 and right ratchet teeth 24, and both the left and right ratchet teeth can engage with the ratchet wheel 1. A spring 5 is fixedly provided below the ratchet pawl 2, and a ball 6 is sandwiched between the top of the spring 5 and the arc surface 21, and the ratchet pawl 2 can swing left and right; rotate the ratchet pawl 2, as Figure 1 shown, when the right ratchet teeth 24 of the ratchet pawl are engaged with the ratchet wheel 1, the ratchet wheel 1 can only rotate counterclockwise; conversely, when the left protruding part of the ratchet pawl 2 is dialed clockwise to make the left ratchet teeth 23 of the ratchet pawl engage with the ratchet wheel 1, the ratchet wheel 1 can only rotate clockwise; thus, by dialing the protruding parts on both sides of the ratchet pawl 2 to make the ratchet pawl 2 engage with the ratchet wheel 1, the forward and reverse rotation of the ratchet wheel 1 can be controlled. The spring 5 is preferably arranged in the groove 7 for fixation, and the ball 6 at the top of the spring 5 is always in close contact with the arc surface 21 of the ratchet pawl 2 to assist in positioning the ratchet pawl 2. In addition, in order to adapt to different specifications of screws / nuts, the ratchet wrench of the present invention can be adapted to different types of sockets.
[0014] As Figure 1 shown, the handle 3 can adopt a hollow structure. A torsion bar 4 is arranged in the middle of the handle 3. The end of the torsion bar 4 is preferably provided with a handle for turning the torsion bar 4. Different materials can be used to make the torsion bar corresponding to different torques, and at the same time, the torsion bar is preferably easy to disassemble to facilitate the replacement of torsion bars of different materials. During use, when the torsion bar 4 is turned until it reaches the torque compliance position 8, it means that the torque is appropriate and the tightening and loosening degree of the screw / nut is optimal, so as to simply measure the torque magnitude. The torsion bar 4 is arranged inside the handle 3 to prevent accidental turning of the torsion bar 4 when using the wrench.
[0015] The ratchet wrench of the present invention has a novel and simple structure, a small volume, can be used in a narrow space, prevents misoperation, and can measure the torque at the same time to ensure the best tightness of the nut.
Claims
1. A ratchet wrench, comprising a ratchet, a pawl and a handle, wherein the ratchet is located at the top of the wrench and a pawl is provided below the ratchet; characterized in that: There is an arc surface on each side of the lower part of the pawl; the middle of the upper part of the pawl is a concave surface, and left and right ratchet teeth are respectively provided on the left and right sides, and the left and right ratchet teeth can engage with the ratchet wheel; a spring is fixed under the pawl, and a marble is sandwiched between the top of the spring and the arc surface. The pawl can control the forward and reverse rotation of the ratchet wheel by swinging left and right.
2. The ratchet wrench according to claim 1, characterized in that: The handle is a hollow structure, and a torsion bar is arranged in the middle of the handle.
3. The ratchet wrench according to claim 2, characterized in that: The spring is arranged in the groove.
4. The ratchet wrench according to claim 3, characterized in that: A handle is provided at the rear end of the torsion bar.
5. The ratchet wrench according to claim 4, characterized in that: The torsion bar is easy to disassemble.
6. The ratchet wrench according to claim 5, characterized in that: The torsion bar can be made of different materials corresponding to different torsion forces.
7. The ratchet wrench according to claim 6, characterized in that: The ratchet wrench can be adapted to sockets of different specifications.