Ratchet wrench

Abstract

A ratchet wrench, comprising a wrench body (1), a rotatable ratchet gear (2) being arranged at the front of the wrench body, and a rotatable left pawl (3) and right pawl (4) being symmetrically arranged at the rear of the wrench body. The surface of the left pawl that is engaged with the ratchet gear is provided with a first left tooth part (31) and a first right tooth part (32), and the surface of the right pawl that is engaged with the ratchet gear is provided with a second left tooth part (41) and a second right tooth part (42). When the left pawl and the right pawl rotate toward two sides to the ratchet gear, the two left tooth parts or the two right tooth parts mesh with the ratchet gear at the same time to limit rotation in a certain direction. The meshing teeth are arranged at two locations of the two pawls, and the state of meshing with the ratchet gear is switched when the two pawls rotate. Thus, while the functions of a ratchet wrench are achieved, the meshing strength is improved by meshing at the two symmetrical locations, the range of rotation during pawl switching is reduced, the operation efficiency is improved, and the costs of and difficulty in manufacturing are reduced in general.

Description

A ratchet wrench Technical Field

[0001] The present invention relates to the field of hardware tools, and more particularly to a ratchet wrench. Background Art

[0002] In existing ratchet wrenches, a pawl is rotated to engage one side with a ratchet ring, causing the ratchet ring to engage and rotate along with the wrench. Manual rotation releases the engagement by a certain angle, allowing the wrench to re-engage and continue rotating, thus achieving the wrench's inherent function of tightening the fastener. The teeth on either side of the pawl cooperate with the ratchet ring to control its forward or reverse rotation. To ensure the stability of the engagement between the pawl and the ratchet ring, the pawl and ratchet ring require sufficient teeth and angles to enhance engagement strength. This requires the pawl and ratchet ring to be larger and more complex in design and manufacture, increasing manufacturing cost and difficulty.

[0003] Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a ratchet wrench. By arranging two meshing teeth on the two pawls, the meshing state with the ratchet ring is switched when the two pawls swing. While realizing the function of the ratchet wrench, the meshing strength is ensured and the overall manufacturing cost and difficulty are reduced.

[0005] The present invention provides the following technical solution: a ratchet wrench, comprising a wrench body, a rotatable ratchet ring provided at the front of the wrench body, and symmetrically arranged rotatable left and right pawls at the rear of the wrench body, the mating surface of the left pawl and the ratchet ring being provided with a first left tooth portion and a first right tooth portion, and the mating surface of the right pawl and the ratchet ring being provided with a second left tooth portion and a second right tooth portion; when the left pawl and the right pawl swing to one side to the ratchet ring, the first left tooth portion and the second left tooth portion simultaneously engage with the ratchet ring to restrict rotation in one direction; when the left pawl and the right pawl swing to the other side to the ratchet ring, the first right tooth portion and the second right tooth portion simultaneously engage with the ratchet ring to restrict rotation in the other direction.

[0006] As an improvement, a sliding rod is provided at the rear of the left pawl and the right pawl, and the sliding rod is slidably provided on the wrench body. When the sliding rod is driven to slide left and right, the left pawl and the right pawl are synchronously driven to swing.

[0007] As an improvement, the middle part of the slide rod is connected to a handle, and the handle is rotatably arranged on the wrench body. When the handle is driven to swing left or right, the slide rod is driven to slide in conjunction.

[0008] As an improvement, a swing arm is provided at one end of the handle, and a first groove for inserting and accommodating the swing arm is provided at the middle part of the outer side of the slide rod. When the swing arm swings left and right, it drives the slide rod to slide.

[0009] As an improvement, two elastic blocks are provided on the slide bar, and the two elastic blocks respectively abut against the outer sides of the left pawl and the right pawl. When the slide bar slides left and right, the elastic blocks abut against the left pawl and the right pawl to swing.

[0010] As an improvement, the elastic stop block includes a stop head and a spring, which are jointly accommodated in a second groove provided on the slide rod. The spring relies on its elasticity to allow the stop head to extend out of the second groove and press against the left pawl or the right pawl.

[0011] As an improvement, the ratchet ring is provided with 90 teeth on the circumference.

[0012] The beneficial effects of the present invention are as follows: by arranging two meshing teeth on the two pawls, the meshing state with the ratchet ring is switched when the two pawls swing. While realizing the function of the ratchet wrench, the symmetrical meshing at the two locations improves the meshing strength, the swing range of the pawl switching becomes smaller, the operating efficiency is improved, and the overall manufacturing cost and difficulty are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of a partial cross-sectional structure of the present invention.

[0014] FIG2 is a schematic diagram of a partial three-dimensional structure of the present invention.

[0015] FIG3 is a schematic diagram of the three-dimensional structure of the present invention. DETAILED DESCRIPTION

[0016] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0017] As shown in Figures 1, 2, and 3, a specific embodiment of the ratchet wrench of the present invention is shown. This embodiment includes a wrench body 1, a rotatable ratchet ring 2 disposed at the front of the wrench body 1, and symmetrically rotatable left and right pawls 3 and 4 disposed at the rear of the wrench body 1. The mating surface of the left pawl 3 and the ratchet ring 2 is provided with a first left tooth portion 31 and a first right tooth portion 32, and the mating surface of the right pawl 4 and the ratchet ring 2 is provided with a second left tooth portion 41 and a second right tooth portion 42. When the left pawl 3 and the right pawl 4 swing to one side to the ratchet ring 2, the first left tooth portion 31 and the second left tooth portion 41 simultaneously engage with the ratchet ring 2 to restrict rotation in one direction. When the left pawl 3 and the right pawl 4 swing to the other side to the ratchet ring 2, the first right tooth portion 32 and the second right tooth portion 42 simultaneously engage with the ratchet ring 2 to restrict rotation in the other direction.

[0018] When the present invention is used, a tool head with the required function is installed on the ratchet ring 2, which can then be rotated for use. As an optimization, by providing symmetrical left and right pawls 3 and 4, taking the accompanying figure as an example, when the left and right pawls 3 and 4 are driven to swing clockwise, the first left tooth portion 31 and the second left tooth portion 41 engage the ratchet ring 2 from two locations; and when the left and right pawls 3 and 4 are driven to swing counterclockwise, the first right tooth portion 32 and the second right tooth portion 42 engage the ratchet ring 2. Depending on the fastener to be operated by the ratchet wrench, the engagement state of the pawl and the ratchet ring can be controlled to achieve the purpose of forward or reverse rotation.

[0019] As an optimization, the ratchet ring 2 is configured with 90 teeth along its circumference. With a circumference of 360 degrees, each of the 90 teeth measures 4 degrees. The relative angle between the mating angles of the left and right pawls 3 and 4 differs by 2 degrees, which is half the angle of one tooth. When the first left tooth 31 of the left pawl 3 engages with the ratchet ring 2, the second left tooth 41 of the right pawl 4 interferes with the ratchet ring 2, thereby forming a position restriction state on both sides. After a 2-degree rotation, the second right tooth 42 of the right pawl 4 engages with the ratchet ring 2, and the first right tooth 32 of the left pawl 3 interferes with the ratchet ring 2, thereby forming a position restriction state on both sides.

[0020] As an improved specific implementation method, a sliding rod 5 is provided at the rear of the left pawl 3 and the right pawl 4. The sliding rod 5 is slidably provided on the wrench body 1. When the sliding rod 5 is driven to slide left and right, the left pawl 3 and the right pawl 4 are synchronously driven to swing.

[0021] As shown in Figure 1, a slide groove is provided in the wrench body 1, and the slide rod 5 slides in the slide groove. When the slide rod 5 moves to the left, the first left tooth portion 31 and the second left tooth portion 41 contact the ratchet ring 2; when the slide rod 5 moves to the right, the first right tooth portion 32 and the second right tooth portion 42 contact the ratchet ring 2, thereby realizing the reversing function.

[0022] As an improved specific implementation method, the middle part of the slide rod 5 is connected to the handle 6, and the handle 6 is rotatably arranged on the wrench body 1. When the handle 6 is driven to swing left or right, the slide rod 5 is driven to slide in conjunction.

[0023] As shown in Figures 1, 2 and 3, the handle 6 extends in front of the wrench body 1, making it easier for the user to drive and slide the slide rod 5, thereby achieving adjustment of the left pawl 3 and the right pawl 4.

[0024] As an improved specific implementation, a swing arm 61 is provided at one end of the handle 6, and a first groove 51 for inserting and accommodating the swing arm 61 is provided in the middle of the outer side of the slide rod 5. The swing arm 61 drives the slide rod 5 to slide when it swings left and right.

[0025] As shown in FIG1 , the swing of the swing arm 61 can be converted into a left and right push on the first groove 51 , thereby achieving translation of the slide bar 5 along the slide groove, and finally achieving stable and orderly driving of the left pawl 3 and the right pawl 4 to swing.

[0026] As an improved specific implementation method, two elastic blocks 7 are provided on the slide bar 5, and the two elastic blocks 7 respectively abut against the outer sides of the left pawl 3 and the right pawl 4. When the slide bar 5 slides left and right, the elastic blocks 7 abut against the left pawl 3 and the right pawl 4 to swing.

[0027] As shown in Figure 1, the elastic stop block 7 applies an elastic resistance force to the left pawl 3 and the right pawl 4, which can drive the left pawl 3 and the right pawl 4 to swing toward the ratchet ring 2 relatively quickly. When the slide bar 5 slides and makes the elastic stop block 7 pass through the rotation axis position of the left pawl 3 and the right pawl 4, it can rely on the elasticity to quickly push the left pawl 3 and the right pawl 4 to swing toward the ratchet ring 2 to complete the engagement. The resistance force has a certain elasticity, which can also reduce the risk of damage caused by hard locking between structures.

[0028] As an improved specific embodiment, the elastic stop block 7 includes a stop head 71 and a spring 72, which are jointly accommodated in a second groove 52 provided on the slide rod 5. The spring 72 relies on its elasticity to allow the stop head 71 to extend out of the second groove 52 and press against the left pawl 3 or the right pawl 4.

[0029] As shown in Figure 1, the butt head 71 extends out of the second groove 52, and contacts the left pawl 3 and the right pawl 4 to form a structural fit and thus realize the function. The spring 72 is accommodated in the second groove 52 to form a good limit, and relies on compression or elastic release to maintain the fit state of the butt head 71 and the left pawl 3 and the right pawl 4.

[0030] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that improvements and modifications that do not depart from the principles of the present invention are within the scope of protection of the present invention.

Claims

1. A ratchet wrench, comprising a wrench body (1), a rotatable ratchet ring (2) being arranged at the front of the wrench body (1), characterized in that: The rear part of the wrench body (1) is symmetrically provided with a rotatable left pawl (3) and a right pawl (4); the mating surface of the left pawl (3) and the ratchet ring (2) is provided with a first left tooth portion (31) and a first right tooth portion (32); the mating surface of the right pawl (4) and the ratchet ring (2) is provided with a second left tooth portion (41) and a second right tooth portion (42); when the left pawl (3) and the right pawl (4) swing to one side to the ratchet ring (2), the first left tooth portion (31) and the second left tooth portion (41) simultaneously engage with the ratchet ring (2) to restrict rotation in one direction; when the left pawl (3) and the right pawl (4) swing to the other side to the ratchet ring (2), the first right tooth portion (32) and the second right tooth portion (42) simultaneously engage with the ratchet ring (2) to restrict rotation in another direction.

2. A ratchet wrench according to claim 1, characterized in that: A slide bar (5) is arranged at the rear of the left ratchet (3) and the right ratchet (4). The slide bar (5) is slidably arranged on the wrench body (1). When the slide bar (5) is driven to slide left and right, the left ratchet (3) and the right ratchet (4) are synchronously driven to swing.

3. A ratchet wrench according to claim 2, characterized in that: The middle part of the slide bar (5) is connected to a handle (6), and the handle (6) is rotatably arranged on the wrench body (1). When the handle (6) is driven to swing left or right, the slide bar (5) is driven to slide in conjunction.

4. A ratchet wrench according to claim 3, characterized in that: A swing arm (61) is arranged at one end of the handle (6), and a first groove (51) for inserting and accommodating the swing arm (61) is arranged at the middle part of the outer side of the slide bar (5). When the swing arm (61) swings left and right, it drives the slide bar (5) to slide.

5. A ratchet wrench according to claim 2, 3 or 4, characterized in that: The slide bar (5) is provided with two elastic blocks (7), which respectively abut against the outer sides of the left ratchet (3) and the right ratchet (4). When the slide bar (5) slides left and right, the elastic blocks (7) abut against the left ratchet (3) and the right ratchet (4) to swing.

6. A ratchet wrench according to claim 5, characterized in that: The elastic stopper (7) comprises a stopper (71) and a spring (72), wherein the stopper (71) and the spring (72) are accommodated together in a second groove (52) provided on the slide bar (5), and the spring (72) relies on its elasticity to make the stopper (71) extend out of the second groove (52) and stop against the left ratchet (3) or the right ratchet (4).

7. A ratchet wrench according to any one of claims 1 to 4, characterized in that: The ratchet ring (2) is provided with 90 teeth on the circumference.

Images