Double-tooth bidirectional ratchet wrench

Abstract

Provided is a double-tooth bidirectional ratchet wrench. Relates to a manual tool. Comprising a wrench body and a ratchet wheel, a pawl groove communicated with the ratchet wheel hole is formed in the inner side of the ratchet wheel hole; the pawl groove comprises a first semicircular groove and a second semicircular groove which are vertically connected side by side. The included angle between the connecting line of the circle center of the first semicircular groove and the circle center of the ratchet hole and the connecting line of the circle center of the second semicircular groove and the circle center of the ratchet hole is T degrees. T = 360 / ratchet tooth number / 2; the radius of the first semicircular groove is equal to that of the second semicircular groove; a button hole which is communicated with the pawl groove and penetrates out of the upper surface of the wrench body is formed in the side part of the pawl groove; the ratchet wheel is rotatably arranged in the ratchet wheel hole; the two-way pawls are rotationally arranged in the corresponding first semi-circular groove and the second semi-circular groove; the tooth changing angle is reduced by matching the staggered peaks of the pawls with the ratchet wheel, and the density of the teeth is not changed, so that the torque and the service life of the wrench are not influenced while the tooth changing angle is reduced.

Description

Technical Field

[0001] The utility model relates to a manual tool, in particular to an improved structure of a double-tooth bidirectional ratchet wrench. Background Art

[0002] The development of wrench tools has reached an extremely mature stage. Among them, the structure of the ratchet wrench is simple and durable. Most of them are provided with a ratchet in the driving hole, and the outer peripheral surface of the ratchet has ratchet teeth for cooperating with the braking device. However, due to strength problems, the current maximum number of teeth is limited to about 72 teeth and 90 teeth. If the number of teeth is more, the ratchet teeth will be too thin to withstand the transmission of driving force, resulting in structural damage. Therefore, the replaceable tooth angle is about 5 degrees or 4 degrees and cannot be further reduced. This leads to the situation that the ratchet wrench cannot be used in a working environment with limited space, such as a working state with a tooth replacement angle less than 5 degrees or 4 degrees. If a smaller tooth replacement angle working state is to be achieved, the teeth of the ratchet and the ratchet pawl need to be made finer, which will lead to a decrease in the torque and service life of the wrench. Therefore, developing a wrench that can achieve a smaller tooth replacement angle (less than 5 degrees) while ensuring the torque and service life of the wrench is a technical problem that needs to be solved urgently at present. Summary of the Utility Model

[0003] The utility model aims at the above problems and provides a double-tooth bidirectional ratchet wrench with a delicate structure that can achieve a tooth replacement angle of less than 5 degrees.

[0004] The technical solution of the utility model is as follows:

[0005] The double-tooth bidirectional ratchet wrench includes:

[0006] A wrench body, with a ratchet hole at one end; a ratchet pawl groove communicating with the inside of the ratchet hole; the ratchet pawl groove includes a first semi-circular groove and a second semi-circular groove arranged side by side and connected up and down. The included angle between the line connecting the center of the first semi-circular groove and the center of the ratchet hole and the line connecting the second semi-circular groove and the center of the ratchet hole is T degrees; T = 360 / number of ratchet teeth / 2; the radii of the first semi-circular groove and the second semi-circular groove are equal; a button hole communicating with the side of the ratchet pawl groove and passing through the upper surface of the wrench body is provided.

[0007] A ratchet, rotatably arranged in the ratchet hole;

[0008] A pair of bidirectional ratchet pawls, rotatably arranged in the corresponding first semi-circular groove and second semi-circular groove;

[0009] A direction button, rotatably arranged in the button hole and provided with connection holes adapted to the pair of bidirectional ratchet pawls;

[0010] The top sleeves, there are a pair of them, one end is sleeved on the spring and located inside the connection hole, and the other end is in contact with the two-way ratchet pawls. By pulling the direction knob, the working directions of the pair of two-way ratchet pawls are switched.

[0011] Specifically, the two-way ratchet pawl includes:

[0012] The first two-way ratchet pawl is rotatably arranged in the first semi-circular groove;

[0013] The second two-way ratchet pawl is rotatably arranged in the second semi-circular groove and is located below the first two-way ratchet pawl.

[0014] Specifically, the top of the direction knob extends out of the knob hole and is provided with a horizontally extending pulling arm.

[0015] Specifically, the inner side of the two-way ratchet pawl is provided with an engaging portion adapted to the ratchet wheel, and the outer side is provided with a pair of arc-shaped convex portions adapted to the top sleeves.

[0016] Specifically, the other end of the pulling body is provided with a pulling opening.

[0017] The utility model adopts two two-way ratchet pawls and is provided with a double semi-circular groove structure adapted thereto; the two semi-circular grooves have the same structure but different positions, and the two ratchet pawls are the same. By staggering the angular distance between the two semi-circular grooves, the two ratchet pawls are staggered in peaks to fit with the ratchet wheel. This structure can double the number of working teeth of the ratchet wrench and reduce the tooth-changing angle by half, so it can be used in a narrower space. Therefore, this structure reduces the tooth-changing angle by staggering the peaks of the ratchet pawls to fit with the ratchet wheel without changing the tooth density, so it has no impact on the torque and service life of the wrench while reducing the tooth-changing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of the split state of the utility model;

[0019] Figure 2 is a schematic diagram of the staggered structure of the first semi-circular groove and the second semi-circular groove;

[0020] Figure 3 is a schematic diagram of the connection state structure of the two-way ratchet pawl and the ratchet wheel;

[0021] Figure 4 is a three-dimensional structural schematic diagram inside the pulling body;

[0022] Figure 5 is a three-dimensional structural schematic diagram of the ratchet pawl groove;

[0023] In the figure, 100 is the pulling body, 110 is the ratchet hole, 120 is the ratchet pawl groove, 121 is the first semi-circular groove, 122 is the second semi-circular groove, and 130 is the knob hole.

[0024] 200 is the ratchet, 210 is the circlip,

[0025] 300 is a two-way pawl, 310 is a first two-way pawl, 320 is a second two-way pawl,

[0026] 400 is the direction button,

[0027] 500 is the top set. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of this utility model. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation and are therefore not to be construed as limitations on this utility model. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0031] Reference below Figures 1-5 Describe the utility model;

[0032] Double tooth reversible ratchet wrench, including:

[0033] The wrench body 100 has a ratchet hole 110 at one end and a wrench opening 140 at the other end; a pawl groove 120 is provided inside the ratchet hole 110 and is in communication therewith; the pawl groove 120 includes a first semi-circular groove 121 and a second semi-circular groove 122 which are arranged side by side and connected up and down, and the included angle between the line connecting the center of the first semi-circular groove 121 and the center of the ratchet hole 110 and the line connecting the second semi-circular groove 122 and the center of the ratchet hole 110 is T degrees; T = 360 / number of ratchet teeth / 2; the radii of the first semi-circular groove and the second semi-circular groove are equal, and the distances from the centers of the first and second semi-circular grooves to the center of the ratchet hole 110 are equal; a button hole 130 which is in communication with the pawl groove 120 and penetrates through the upper surface of the wrench body 100 is provided on the side of the pawl groove 120.

[0034] Preferably, the ratchet 200 has 72 teeth and the angle of each tooth is 5 degrees, then T = 2.5 degrees. As Figure 2 shown, in this case, the T angle is evenly divided into two angles by the vertical center line of the ratchet hole.

[0035] If the ratchet 200 has 90 teeth and the angle of each tooth is 4 degrees, then T = 2 degrees.

[0036] In this case, the processing methods of the first semi-circular groove 121 and the second semi-circular groove 122 are as follows:

[0037] First, use a tool with a thickness adapted to the total thickness of the first semi-circular groove 121 and the second semi-circular groove 122 to pre-cut a groove according to the center point of the first semi-circular groove 121, and then use a tool with a thickness adapted to the thickness of the second semi-circular groove 122 to process the second semi-circular groove 121 according to the center point of the second semi-circular groove 122. In this case, the thicknesses of the first semi-circular groove 121 and the second semi-circular groove 122 are equal.

[0038] The distances from the center point of the ratchet hole 110 to the centers of the first semi-circular groove 121 and the second semi-circular groove 122 are equal, and are respectively L;

[0039] L = R * (0.8 ± 0.1), where R is the radius of the first semi-circular groove 121 or the second semi-circular groove 122, and the two radii are equal;

[0040] R = D * (0.4 ± 0.05), where D is the diameter of the ratchet hole.

[0041] The ratchet 200 can be rotatably arranged in the ratchet hole 110 through the restriction of the snap ring 210;

[0042] There are a pair of two-way pawls 300 which can be rotatably arranged in the corresponding first semi-circular groove 121 and second semi-circular groove 122; the inner side of the two-way pawl 300 is provided with an engaging portion adapted to the ratchet 200, and the outer side is provided with a pair of arc-shaped protruding portions adapted to the top sleeve 500.

[0043] The direction knob 400 is rotatably arranged in the knob hole 130 and is provided with a connection hole adapted to a pair of the bidirectional pawls 300; the top of the direction knob 400 extends out of the knob hole 130 and is provided with a horizontally extending lever arm, which is convenient for manually adjusting the rotation direction of the top sleeve 500.

[0044] There are a pair of top sleeves 500, one end of which is sleeved on a spring and located in the connection hole, and the other end is in contact with the bidirectional pawl 300. By pulling the direction knob 400, the working directions of a pair of the bidirectional pawls 300 are switched.

[0045] In this case, the bidirectional pawl 300 includes:

[0046] The first bidirectional pawl 310 is rotatably arranged in the first semi-circular groove 121;

[0047] The second bidirectional pawl 320 is rotatably arranged in the second semi-circular groove 122 and is located below the first bidirectional pawl 310.

[0048] Working principle:

[0049] This structure of the bidirectional ratchet wrench includes a wrench body 100, a ratchet 200, a circlip 210, a bidirectional pawl 300, a direction knob 400, a spring, and a top sleeve 500; when the direction knob 400 is pulled to one side, the two top sleeves 500 respectively push the two bidirectional pawls 300 to fit with the pawl groove 120 under the action of the spring. Since there is an included angle T of half a tooth between the two semi-circular grooves, on the same side, only one of the bidirectional pawls 300 meshes with the ratchet 200, and the tooth tip of the other bidirectional pawl 300 contacts the tooth tip of the ratchet 200, as Figure 5 shown; the ratchet, the engaged bidirectional pawl 300, and the wrench body form a direction lock. At this time, the wrench can be used to turn the screw in the opposite direction. When the wrench rotates the ratchet 200 by an angle of half a tooth in the reverse direction, under the retraction function of the spring, the bidirectional pawl 300 originally meshing with the ratchet 200 separates from the ratchet 200, and the other bidirectional pawl 300 meshes with the ratchet 200 to achieve the effect that the teeth of the two bidirectional pawls 300 are staggered from the teeth of the ratchet 200. The working principle is the same when the direction knob 400 is pulled to the other side.

[0050] Regarding the content disclosed in this case, the following points need to be explained:

[0051] 1. The attached drawings of the embodiments disclosed in this case only relate to the structures involved in the embodiments disclosed in this case, and other structures can refer to the general design;

[0052] 2. Without conflict, the embodiments disclosed in this case and the features in the embodiments can be combined with each other to obtain new embodiments;

[0053] The above is only the specific implementation manners disclosed in this case, but the protection scope of this disclosure is not limited thereto. The protection scope disclosed in this case shall be subject to the protection scope of the claims.

Claims

1. Double-tooth bidirectional ratchet wrench, characterized in that include: A lever body (100) is provided with a ratchet hole (110) at one end; a ratchet groove (120) is provided inside the ratchet hole (110) and is connected thereto; the ratchet groove (120) comprises a first semicircular groove (121) and a second semicircular groove (122) which are arranged side by side and connected to each other; the angle between the line connecting the center of the first semicircular groove (121) and the center of the ratchet hole (110) and the line connecting the center of the second semicircular groove (122) and the center of the ratchet hole (110) is T degrees; T = 360 / number of ratchet teeth / 2; the radius of the first semicircular groove is equal to that of the second semicircular groove; a button hole (130) is provided on the side of the ratchet groove (120) and is connected thereto and extends from the upper surface of the lever body (100); A ratchet (200) rotatably disposed in the ratchet hole (110); A pair of bidirectional pawls (300) are provided and are rotatably arranged in the corresponding first semicircular groove (121) and second semicircular groove (122); A direction button (400) is rotatably disposed in the button hole (130) and is provided with connection holes adapted to a pair of bidirectional pawls (300); A pair of top sleeves (500) are provided, one end of which is sleeved on the spring and located in the connecting hole, and the other end is fitted with the two-way pawl (300). By turning the direction button (400), the working direction of the pair of two-way pawls (300) is switched.

2. The double-tooth bidirectional ratchet wrench according to claim 1, characterized in that, The bidirectional pawl (300) comprises: a first bidirectional pawl (310) rotatably disposed in the first semicircular groove (121); The second bidirectional pawl (320) is rotatably disposed in the second semicircular groove (122) and is located below the first bidirectional pawl (310).

3. The double-tooth bidirectional ratchet wrench according to claim 1, characterized in that, The top of the direction button (400) extends out from the button hole (130) and is provided with a horizontally extending trigger arm.

4. The double-tooth bidirectional ratchet wrench according to claim 1, characterized in that, The inner side of the bidirectional pawl (300) is provided with an engaging portion adapted to the ratchet wheel (200), and the outer side is provided with a pair of arc-shaped protrusions adapted to the top sleeve (500).

5. The double-tooth bidirectional ratchet wrench according to claim 1, characterized in that, The other end of the wrench body (100) is provided with a wrench opening (140).

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