BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to wrenches, and more particularly, to a quick reciprocating wrench.

2. Description of the Related Art

As shown by the wrench of U.S. Pat. No. 6,978,701, the head portion thereof has a ring component, such that the ring component is mounted around a hexagonal nut. However, when the hexagonal nut is to be fastened, after driving the nut to rotate in clockwise by 60 degrees through the wrench, the user needs to detach the wrench from the hexagonal nut along the axial direction of the nut, rotates the wrench in counterclockwise by 60 degree, re-mounts the ring component around the nut, and repeats the aforementioned wrenching operation. Such operation is time costing, and such type of wrench is not categorized under a quick operative wrench.

Also, as shown by WO2018/167520A1 “LINE WRENCH HEADS AND LINE WRENCHES”, a line wrench includes a wrench head, a fixed head portion, and a pivoting head portion, wherein the pivoting head portion pivotally moves to open with respect to the fixed head portion. Further, a resilient portion is disposed between the wrench head and the pivoting head portion, such that the pivoting head portion is maintained at a closing position with respect to the fixed head portion. Therefore, the line wrench is able to be efficiently engaged with a hexagonal fastener on a pipe through the pivoting operation of the pivoting head portion with respect to the fixed head portion, thereby screwing the hexagonal fastener. However, based on the fact that the pivoting head portion capable of pivoting to open with respect to the fixed head portion, in case the resilient force of the resilient portion is insufficient during fastening the hexagonal fastener, the counterforce of the hexagonal fastener may cause the pivoting head portion to open with respect to the fixed head portion, thus resulting the skid and an torque deficiency of the fastening process. Also, if the strength of the resilient force during the fastening process is too large, a pressing difficulty may be caused, such that the wrench is difficult to be detached from the pipe.

Notably, the aforementioned patents are invented by an identical inventor. U.S. Pat. No. 6,978,701 focuses on a ring wrench or a ring spanner, which is operated with a relatively slow operation speed and not categorized as a fast operative wrench. The application WO2018/167520A1 is categorized as a line wrench. Therefore, the aforementioned two patents are not invented for serving an identical operational demand, and thus difficult to be combined for facilitating the usage thereof. Based on the fact that the two patents are invented by a single inventor and do not belong to the same category, it is clearly seen that a time-saving and useful high-torque line wrench is not obvious in the industry.

In addition, U.S. Pat. No. 9,884,409 discloses a pipe wrench, wherein the pivotal member thereof has a distal end inserted in the second recess during the fastening process of the hexagonal object. For facilitating the function, two separate pivots (first and second locking members) are required, such that the pivotal members have two different pivot centers, so as to remove the distal end of the pivotal member from the second recess. However, such design increases the structural complexity and the cost thereof, which is still not optimal. On the basis of the aforementioned patents, inventor of the present invention invented a high-precision, high-quality quick reciprocating wrench for providing an optimal convenience of usage and operation of the wrench.

SUMMARY OF THE INVENTION

For improving the issues above, a quick reciprocating wrench is disclosed. During a high-torque fastening operation, a retaining portion of a claw is allowed to achieve a blocking function with a block portion, so as to prevent the retaining portion from detaching with respect to the block portion. Thus, when applied in a situation other than an oil-pipe work site, the present invention is still stably engaged with the fastener and prevents a disengagement during the wrenching process. Therefore, the present invention fulfills the expectation of the user during a high-torque operation, thus being a wide-range applicable quick reciprocating wrench.

For achieving the aforementioned objectives, a quick reciprocating wrench in accordance with an embodiment of the present invention is provided, comprising a main body, a claw, and an elastic device. The main body has a concavely-shaped first jaw opening, which has a pivot end on one side and a block portion on another side in opposite to the pivot end. The claw has a concavely-shaped second jaw opening, which has a pivotal combination portion on one side and a retaining portion on another side in opposite to the pivotal combination portion. The pivotal combination portion of the claw is pivotally connected with the pivot end of the main body along a pivot center, such that the claw and the main body are able to pivotally move with respect to each other. The elastic device is disposed between the main body and the claw. When the wrench is not combined with the fastener, the first jaw opening of the main body and the second jaw opening of the claw form a sealed status. When the wrench is combined with the fastener, the fastener is positioned in the first and second jaw openings, wherein the distance between the block portion and the neighboring first force bearing face of the fastener gradually decreases along a direction in opposite to the expansion direction of the claw and the block portion, and the largest width of the distal end of the retaining portion is greater than the smallest distance between the block portion and the first force bearing face of the fastener.

With such configuration, during the fastening operation, an outer retaining face of the retaining portion achieves a blocking function with the block portion, and an inner retaining face also achieves a blocking function with the first force bearing face of the fastener, such that the claw is prevented from detaching from the block portion for assuring the stable engagement status. Therefore, the separation between the claw and the main body is prevented, and the accidental detachment of the fastener and the wrench is also avoided, achieving a high-torque force imposing effect during the fastening operation.

