Wrench

A wrench includes a transmitting device and a shell. The transmitting device comprises a rotor, a first working member, a second working member, a first linking member and a second linking member. The first linking member is disposed between the first working member and the rotor. The shell has a containing room for the linking device to be disposed therein. The shell comprises a middle section. The first end of the middle section extends upwardly to connect with the first section. The second end of the middle section extends downwardly to connect with the second section. Thus, the wrench has two stair portions of different horizontal level. And Users can hold the wrench more stably. Because the wrench uses the rotor and two linking members to drive the first working member and the second working member rotating, a total size of the wrench can be kept as smaller as possible.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wrench, and more particularly to a wrench which can be adapted to be used in narrow working spaces, and a wrench which can be driven by a tool for operating.

2. Description of the Prior Art

Conventional wrenches are disclosed in patents such as U.S. Pat. Nos. 5,540,122, 4,867,016, 4,491,042 and US20040093990. The wrenches in the patent mentioned above use various driving structures to enable those wrenches of being driven by a tool to operate in narrow working spaces. In other words, those wrenches use a single driving structure to have an end of one working member drive an end of another working member.

The wrenches described above are straight and flat-shaped. However, speaking of operating in narrow working spaces, it's not easy for users to hold the straight and flat-shaped wrench. Thus, users would hold the wrench unstably with shaking, and it's also difficult to focus power on one of the working members in order to drive another working member rotating. As a result, users need more time and attention to finish a work. Moreover, it is also possible that the wrench would fall into the narrow working space during an operation period because of holding unstably.

Therefore, a wrench with a special design could improve the problems mentioned above. For instance, a wrench with stair-shaped design could be an option. If the wrench is made with stair-shape design, and those two working members still have to be driven by the driving structure to keep effects of linking rotation. An outer shell of the wrench with stair-shaped design needs to be enlarged so as to contain those two working members and the driving structure. On the other hand, once the outer shell is enlarged, the wrench would not be able to enter the narrow working space, and advantages before reforming are nonsense as well. The application of the stair-shaped wrenches would be limited.

Furthermore, because the wrenches mentioned above have only a single driving structure, those wrenches can only be equipped with two working members at two ends of wrenches along a longitude direction of those wrenches. When working in some narrow working spaces, penetrating holes of both two ends of the shell, protruded by a working member, are obstructed due to an operation angle, so users can not drive any working member through any penetrating hole on both two ends of the shell. That means applications of the wrenches are limited by working environments.

With concerns about problems described above, it is necessary to design a wrench which can be held stably with minimized size, and be adapted to be used in various narrow spaces of working environments.

SUMMARY OF THE INVENTION

The main object of the present invention is to provide a wrench which can be held stably with minimized size, and can be adapted to be used in various narrow spaces of working environments.

To achieve the above, a wrench of the present invention includes a transmitting device and a shell. The transmitting device includes a rotor, a first working member, a second working member, a first linking member and a second linking member. The rotor includes an upside driving portion and an underside driving portion. The first working member has at least one head, and the second working member also has at least one head. The first linking member is disposed between the first working member and the upside driving portion, and the second working member is disposed between the second working member and the underside driving portion. The shell has a containing room, used for the transmitting device to be positioned therein. The shell has a first section, a second section, and a middle section, and the middle section has a first end and a second end. The first end extends upwardly to connect with the first section, and the second end extends downwardly to connect with the second section. Thus, one stair portion of different horizontal level is formed between the first section and the middle section, another stair portion of different horizontal level is formed between the second section and the middle section. The first section has a penetrating hole, and the first working member is disposed in the first section. The head of the first working member protrudes from the penetrating hole of the first section. The second section also has a penetrating hole, and the second working member is disposed in the second section. The head of the second working member protrudes from the penetrating hole of the second section as well.

The wrench of the present invention is stair-shaped so that users can have some spaces for hands to hold the wrench stably when working. As such, users can focus power on the wrench easier without slipping. And the wrench can be adapted to be used in various narrow spaces. Moreover, the wrench uses the rotor and two linking members to drive the first working member and the second working member rotating. Therefore, the total size of the wrench can be kept as smaller as possible. And the transmitting device can still keep the best effects of linking and rotating. The present invention will become more obvious from the following description when taken in connection with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment(s) in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer toFIG. 1toFIG. 3for the first embodiment of the present invention. A wrench of the present embodiment includes a transmitting device and a shell.

The transmitting device comprises a rotor11, a first working member12, a second working member13, a first linking member14and a second linking member15. The rotor11comprises an upside driving portion111and an underside driving portion112. The first working member12has at least one head121, and the second working member13has at least one head131. The heads121,131mentioned above can be adapted to be inserted by a cylinder A or a tool, as shown inFIG. 5. The first linking member14is disposed between the first working member12and the upside driving portion111, and the second linking member15is disposed between the second working member13and the underside driving portion112. To increase an efficient structure to the present invention, the first working member12comprises a toothed plate122, and the second working member13can comprise a toothed plate132. The upside driving portion111can comprise a toothed plate, and the underside driving portion112can comprise a toothed plate. The first linking member14is disposed between the toothed plate122of the first working member and the toothed plate111of the upside driving portion. The second linking member15is disposed between the toothed plate132of the second working member and the toothed plate112of the underside driving portion. Each of the first linking member14and the second linking member15is a chain. As such, the first linking member14can be rotational engaged between the toothed plate122of the first working member and the toothed plate111of the upside driving portion. The second linking member15can be rotational engaged between the toothed plate132of the second working member and the toothed plate112of the underside driving portion. In the second embodiment of the present invention, as shown inFIG. 6, each of the first linking member14and the second linking member15can also be a toothed chain. Of course, structures of the first linking member and the second linking member of the present invention are not limited by the structure described above. Taking the third embodiment for instance, as shown inFIG. 7, the chains or the toothed chains described above are replaced by two belts, serving as the first linking member14and the second linking member15. And the same rotating function of linking can also be achieved without the toothed plate serving as the first working member12, the working member13, the upside driving portion111and the underside driving portion112.

Please refer toFIG. 1toFIG. 5, the shell has a containing room21, and the transmitting device is disposed in the containing room21. The shell comprises a first section22, a second section23, and a middle section24. The middle section has a first end241and a second end242, two sides243, a top surface244and a bottom surface245. The first end241extends upwardly to connect with the first section22, the second end242extends downwardly to connect with the second section23. Thus, one stair portion of different horizontal level is formed between the first section and the middle section, another stair portion of different horizontal level is formed between the second section and the middle section. The first section22has a penetrating hole221, and the first working member12is disposed in the first section22. The head121of the first working member protrudes from the penetrating hole221of the first section. Also, the second section23has a penetrating hole231, and the second working member13is disposed in the second section23. The head131of the second working member protrudes from the penetrating hole231of the second section.

Please refer back toFIG. 5again, when users use the wrench to disassemble a screw, the second working member13can be rotated by a tool. Meanwhile, the second linking member15, the rotor11, the first linking member14and the first working member12would be driven to rotate by the second working member13. The cylinder A is disposed on the first working member12so that the cylinder A could engage with the screw. The cylinder A would be driven to rotate with disassembling the screw from a constructing surface when the first working member12rotates.

Because the wrench of the present invention is stair-shaped, the wrench would not completely fit with the constructing surface. Some spaces would be left for users' hand to hold the wrench stably. As such, users can focus power on the wrench easier without slipping. The two sides243of the middle section have plural grooves246respectively. The plural grooves246can be used for users' hand to hold stably. The plural grooves246of each side is interval arranged with each other. Positions of the plural grooves246on one side243are symmetrical to positions of the plural grooves246on another side243. As such, users can hold the wrench stably and conveniently.

Furthermore, because the rotor11, the first linking member14and the second linking member15are disposed in the transmitting device, the wrench could use the first working member and the second member with normal sizes. And the total size of the wrench is still kept minimized after wrench composition. And the transmitting device can still keep best effects of linking and rotating.

Also, in order to enable the wrench to be adapted to more different narrow spaces, the first section22has two penetrating holes221, and the second section has two penetrating holes231. To be more precisely, the two penetrating holes221of the first section are respectively located on the top surface and the bottom surface of the first section. The two penetrating holes231of the second section are respectively located on the top surface and the bottom surface of the second section. As shown inFIG. 3, the first working member includes two heads121, and the two heads121are respectively located in one of the two penetrating holes221. The first working member includes two heads131, and the two heads131are respectively located in one of the two penetrating holes231. As such, users can choose two penetrating holes suitable to be adapted to the narrow spaces. Thus, the wrench of the present invention has more practicability.

However, some narrow constructing spaces have limitations on angle. Therefore, in the forth embodiment of the present invention, as shown inFIG. 8andFIG. 9, a structure of the forth embodiment is different form the first embodiment. The difference is that the top surface244of the middle section has one through hole, and the bottom surface of the middle surface has another through hole. The rotor includes two heads113, and the linking member is disposed in the middle section. The two heads113of the rotor are respectively located in one of the two through holes. In other words, the rotor can keep not only a characteristic of a middle linking component that drives the first working member and the second member to rotate, but also effects of the working members. When the first working member and the second working member can not be used for disassembling a screw by a tool because of the angle limitations, the tool can be inserted in the head of the rotor to disassemble the screw. Therefore, problems caused by the angle limitations can be improved.

What is worthy mentioning is that the heads of the first working member, the second working member, or the rotor can respectively rotate more smoothly with a bearing3. The bearing3can be respectively disposed around the heads of the first working member, the second working member, or the rotor. The bearings can prevent the working members from wear and tear. As such, the disassembling efficiency and the lifetime of the present invention are further enhanced.