TW201350277A - Ratchet wrench - Google Patents

Abstract

A ratchet wrench which comprises at least one tool side is disclosed. The tool side comprises an annular part and a ratchet which is pivotally disposed in the annular part. The ratchet made of elastic material is a ring with an open mouth. The inner side of the ratchet is a socket part which comprises a plurality of standing elements and a plurality of absorbing elements, wherein the standing elements and the absorbing elements are staggered, and each of the standing elements is placed between two of the absorbing elements. The absorbing elements can absorb an outward force by means of changing its shape. A first toothed part is disposed at the inner side of the annular part. A second toothed part is disposed at the outer side of the ratchet. The ratchet can make one-way rotation relative to the annular part by the first toothed part and the second toothed part. Therefore, the ratchet wrench has lesser components, and thus can be processed easily and assembled easily.

Description

Ratchet wrench

The present invention relates to a hand tool, and more particularly to a ratchet wrench.

The tool end of the conventional ratchet wrench generally includes the following components: a ratchet, a tooth and an elastic component. When the screw is tightened or loosened by the ratchet wrench, the elastic component can be changed by the different direction of rotation of the ratchet wrench. The abutting state of the teeth, thereby controlling whether the teeth and the ratchets are engaged, and the ratchet wrench has a one-way driving function, such as U.S. Patent No. 5,979,274.

In order to install the above components on the ratchet wrench, the tool end needs to design a ring neck for the ratchet wheel, and two accommodating spaces are arranged adjacent to the tool end for respectively accommodating the tooth and the elastic component. However, the conventional ratchet wrench has the following disadvantages: (1) The components are cumbersome: it is necessary to produce various components in different production lines, thereby increasing the production cost. (2) It is not easy to process: two accommodating spaces need to be arranged on the body. The size and arrangement of the accommodating spaces need to match the size and working path of the elastic components and the teeth, so that the elastic components can accurately follow the rotation direction of the ratchet wrench. Pushing or loosening the teeth, so it requires a certain degree of precision to improve the difficulty of processing. (3) The assembly is not easy: the components are cumbersome, and each component needs to be placed in a different accommodating space, and the problem that the assembly is not easy is derived. Therefore, the industry continues to introduce improvements in the structure of the ratchet wrench, such as the Taiwan Patent No. M409134, which changes the inclination angle of the accommodating space of the accommodating elastic member in the body to simplify the processing. Another example is the Taiwan patent case number: M412031, which replaces the tooth by the push rod, and can be slid on the slide by the push rod, thereby improving the assembly efficiency.

However, regardless of the above structure, the tool end of the ratchet wrench still needs at least three components: a ratchet, an elastic component, a tooth or a push rod, and the corresponding accommodation space needs to be set on the wrench body, so it cannot be effectively solved. The ratchet wrench components are cumbersome and have problems arising from them.

Accordingly, it is an object of the present invention to provide a ratchet wrench that is effective in reducing components to achieve simplified assembly, ease of processing, and ease of assembly.

One aspect of the present invention is to provide a ratchet wrench that includes at least one tool end. The tool end includes a ring neck and a ratchet wheel, and the ratchet wheel is pivoted in the ring neck. The ratchet is made of an elastic material and has an annular shape with an opening. The inner circumference of the ratchet is a fitting portion, and the fitting portion includes a plurality of resisting elements and a plurality of absorbing elements, and the resisting element and the absorbing element are alternately arranged and resisted. The element and the absorption element are adjacent to each other, wherein the absorption element can absorb the outward stress by means of elastic deformation. The outer circumference of the ratchet is a second tooth portion, and the first tooth portion is disposed in the ring neck portion, and the first tooth portion meshes with the second tooth portion, so that the ratchet wheel can only rotate unidirectionally with respect to the ring neck portion.

According to the design, the tool end of the ratchet wrench of the present invention only needs to ratchet the member, and the design of the ratchet and the design of the second tooth portion of the ring neck can achieve the one-way driving function, thereby effectively Achieve simplified components, easy processing and easy assembly.

According to an embodiment of the invention, the ratchet is made of metal. In addition, The fitting part, the resisting element and the absorbing element can be integrally connected. When the fitting part, the resisting element and the absorbing element are integrally connected, the absorbing element may be an elastic cusp. Alternatively, the absorbing element can be an elastic piece that is inserted and fixed to the ferrule.

According to an embodiment of the invention, the number of the resisting element and the absorbing element of the fitting portion is three or five, respectively. The distance between the resisting elements of the aforementioned fitting portion may be equal to each other. Similarly, the absorption elements of the aforementioned fitting portions may be equal to each other.

According to an embodiment of the invention, the second tooth portion includes a plurality of ratchet teeth, the ratchet teeth have a first tooth edge and a second tooth edge, and the inclination of the first tooth edge is greater than the inclination of the second tooth edge.

Please refer to FIG. 1 to FIG. 2 . FIG. 1 is an exploded perspective view of a ratchet wrench according to an embodiment of the present invention. Fig. 2 is an exploded front view showing the ratchet wrench of Fig. 1.

The ratchet wrench includes at least one tool end 200. The tool end 200 includes a ring neck 210 and a ratchet 220 that is pivotally disposed within the ring neck 210. The ratchet 220 is made of an elastic material. In the present embodiment, an elastic steel material is used to form an annular shape having an opening 223, and the opening 223 can provide a space for the ratchet 220 to be elastically deformed.

The inner circumference of the ratchet 220 is a fitting portion 221, and the fitting portion 221 is for tying the workpiece. The fitting portion 221 includes a plurality of integrally connected resisting members 221a and a plurality of integrally connected absorbing members 221b. The resisting members 221a and the absorbing members 221b are alternately disposed, and the resisting members 221a and absorbing members 221b are adjacent to each other, and the resisting members are mutually connected to each other. Isometric, each absorption element is equidistant from each other.

The outer circumference of the ratchet wheel 220 is a second tooth portion 222. The first tooth portion 211 is disposed in the ring neck portion 210. The first tooth portion 211 is engaged with the second tooth portion 222, so that the ratchet wheel 220 can only be opposite to the ring neck portion 210. Turn to the direction. In other words, the ratchet 220 can only rotate clockwise or counterclockwise relative to the ring head 210.

Please refer to FIG. 2 and FIG. 3 , and FIG. 3 is a partially enlarged view showing the second tooth portion 222 of the ratchet wrench of FIG. 2 . In FIG. 3, the inclination of the first tooth edge 222a of the second tooth portion 222 is greater than the inclination of the second tooth edge 222b, and the "inclination" means that the inner circle R of the second tooth portion 222 is (only a part of the circumference is revealed in the figure), and the line P is formed at the intersection point P of each tooth edge and the inscribed circle R. The larger the angle between the tangent line L and the tooth edge, the greater the inclination. It can be seen from FIG. 3 that the angle A1 of the first tooth edge 222a and the tangent line L is greater than the angle A2 of the second tooth edge 222b and the tangent L, so that the inclination of the first tooth edge 222a is greater than the second tooth edge 222b. The inclination. When the user rotates the ratchet wrench clockwise, the first tooth portion 211 needs to overcome the inclination of the first tooth edge 222a of the second tooth portion 222 to smoothly rotate. However, the inclination of the first tooth edge 222a is large and difficult. To overcome, therefore, the second tooth portion 222 can be engaged with the first tooth portion 211, so that the ratchet wheel 220 cannot rotate relative to the ring neck portion 210; conversely, when the user rotates the ratchet wrench counterclockwise, the first tooth portion 211 needs to be overcome. The inclination of the second tooth edge 222b of the second tooth portion 222 can be smoothly rotated, and the inclination of the second tooth edge 222b can be overcome, so that the ring neck portion 210 can rotate relative to the ratchet wheel 220. With this design, the ratchet 220 can only be unidirectionally rotated relative to the ring neck 210.

Please refer to FIG. 4A, FIG. 4B and FIG. 5, FIG. 4A is a first use state diagram of the ratchet wrench of FIG. 1, and FIG. 4B is a ratchet wheel 220 of FIG. 4A pushed by the external stress F1. Schematic diagram of elastic deformation, Figure 5 A second state of use diagram of the ratchet wrench of Figure 1 is shown. In FIG. 4A, the user acts on a workpiece with a ratchet wrench, such as a screw 300. The user sleeves the screw 300 with the sleeve portion 221 of the ratchet 220, and the user rotates clockwise as indicated by the white hollow arrow. Because the first tooth portion 211 cannot overcome the inclination of the first tooth edge 222a, the second tooth portion 222 can engage with the first tooth portion 211, so that the ratchet wheel 220 cannot rotate relative to the ring neck portion 210. Moreover, the ratchet wrench applies a force to the screw 300. According to the principle of the force and the reaction force, the screw 300 is reversely applied to the outward biasing force F1 of the ratchet 220. The ratchet 220 is subjected to the outward stress F1. The pushing action is elastically deformed outwardly. As shown in FIG. 4B, the second tooth portion 222 of the ratchet 220 is more closely engaged with the first tooth portion 211 of the ring neck portion 210, so that the user can smoothly drive the screw 300. The ratchet wheel 220 is designed to have an annular shape with an opening 223. The opening 223 is used to provide a sufficient elastic deformation space for the ratchet wheel 220, which facilitates the engagement of the second tooth portion 222 with the first tooth portion 211.

In Fig. 5, the user rotates the ratchet wrench counterclockwise as indicated by the white hollow arrow, at which time the first tooth portion 211 can overcome the inclination of the second tooth edge 222b (see Figure 4B), thus the ring neck 210 can rotate relative to the ratchet 220, and the ratchet wrench applies a force to the screw 300. According to the principle of the force and the reaction force, the screw 300 will be applied to the absorption element 221b of the ratchet 220 to the outward stress F2. In the embodiment, the absorbing element 221b is a convex elastic cusp, and a gap 224 is formed between the absorbing element 221b and the resisting element 221a, so that the absorbing element 221b can elastically deform the external stress F2. Therefore, the outward stress F2 cannot push the ratchet 220 to be close to the first tooth portion 211, that is, the outward direction should be The force F2 cannot hinder the relative rotation between the ring neck 210 and the ratchet wheel 220. Therefore, the ratchet wrench cannot rotate the screw 300, and the user can rotate the ratchet wrench back to the initial position without separating the fitting portion 221 and the screw 300. The position of the screw 300 is driven to continue the operation of turning the screw 300.

Please refer to FIG. 6, which is a front view of a ratchet wrench according to another embodiment of the present invention. In this embodiment, the sleeve portion 221 of the ratchet 220 is provided with only three absorption elements 221b and three resisting elements 221a, which is more compact in design.

Please refer to FIG. 7, which is a front view of a ratchet wrench according to still another embodiment of the present invention. In this embodiment, the absorbing element 221b of the sleeve portion 221 of the ratchet 220 is an elastic piece inserted and fixed to the accommodating portion 221, and the elastic piece can also absorb the outward stress by means of elastic deformation.

It can be seen from the above embodiments of the present invention that the tool end of the ratchet wrench of the present invention has different effects by the absorption element of the ratchet and the resisting element, and the first tooth portion and the second tooth portion of the ring neck wall have different inclinations. The design of the tooth edge can achieve the function of driving the workpiece in one direction. Different from the conventional ratchet wrench, at least one ratchet, one tooth and one elastic element are required to achieve the function of driving the workpiece in one direction, the ratchet wrench of the invention It has the advantages of simplifying components, easy processing and easy assembly.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

200‧‧‧Tool side

210‧‧‧ Ring neck

211‧‧‧First tooth

220‧‧‧ratchet

221‧‧‧ Included

221a‧‧‧Resistance

221b‧‧‧absorber

222‧‧‧second tooth

222a‧‧‧first tooth edge

222b‧‧‧second tooth

223‧‧‧ openings

224‧‧‧ gap

300‧‧‧ screws

R‧‧‧Inscribed circle

L‧‧‧ tangent

A1‧‧‧ angle

A2‧‧‧ angle

P‧‧‧ points

F1‧‧‧ force

F2‧‧‧ force

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

Fig. 2 is an exploded front view showing the ratchet wrench of Fig. 1.

Fig. 3 is a partially enlarged view showing the second tooth portion of the ratchet wrench of Fig. 2.

Fig. 4A is a view showing a first use state of the ratchet wrench of Fig. 1.

Fig. 4B is a schematic view showing the elastic deformation of the ratchet wheel of Fig. 4A subjected to outward stress.

Fig. 5 is a view showing a second state of use of the ratchet wrench of Fig. 1.

Figure 6 is a front elevational view of a ratchet wrench in accordance with another embodiment of the present invention.

Figure 7 is a front elevational view of a ratchet wrench in accordance with yet another embodiment of the present invention.

200‧‧‧Tool side

210‧‧‧ Ring neck

211‧‧‧First tooth

220‧‧‧ratchet

221‧‧‧ Included

221a‧‧‧Resistance

221b‧‧‧absorber

222‧‧‧second tooth

223‧‧‧ openings

224‧‧‧ gap

Claims (10)

A ratchet wrench includes at least one tool end, and the tool end includes: a ring neck portion having a first tooth portion therein; and a ratchet wheel having an open ring shape and made of an elastic material The ratchet is pivotally disposed in the ring neck. The ratchet includes: a set of joints disposed on the inner circumference of the ratchet and including a plurality of resisting elements and a plurality of absorbing elements, the resisting elements and the absorbing elements The elements are staggered, and the resisting elements and the respective absorbing elements are adjacent to each other, and the absorbing element absorbs the outward stress by elastic deformation; and a second tooth portion is disposed on the outer periphery of the ratchet. And the second tooth portion meshes with the first tooth portion, so that the ratchet wheel can only rotate unidirectionally with respect to the ring neck portion. The ratchet wrench of claim 1, wherein the ratchet is made of metal. The ratchet wrench of claim 1, wherein the fitting portion and the resisting members are integrally connected to the absorbing elements. The ratchet wrench of claim 3, wherein each of the absorbing elements is an elastic cusp. The ratchet wrench of claim 1, wherein each of the absorbing elements is an elastic piece inserted and fixed to the hem portion. The ratchet wrench of claim 1, wherein the number of the resisting elements and the number of the absorbing elements of the fitting portion are respectively three. The ratchet wrench of claim 1, wherein the number of the resisting elements and the number of the absorbing elements of the fitting portion are five. The ratchet wrench of claim 1, wherein the resisting elements of the fitting portion are equidistant from each other. The ratchet wrench of claim 1, wherein the absorbing elements of the ferrule are equidistant from each other. The ratchet wrench of claim 1, wherein the second tooth portion comprises a plurality of ratchet teeth, each of the ratchet teeth has a first tooth edge and a second tooth edge, and the first tooth edge has a slope greater than the The inclination of the second tooth edge.