Hexagonal wrench

A hexagonal wrench has a head. The head has an end surface, six equal side surfaces and at least one groove. Each side surface has a left edge segment and a right edge segment adjacent to the left edge segment of an adjacent side surface. The at least one groove is formed in at least one of the right edge segments and the left edge segments and extends to the end surface. Therefore, the head can engage securely an inner surface of a socket to rotate the socket even when the socket is worn or rounded.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a hexagonal wrench, and more particularly to a hexagonal wrench capable of engaging an inner surface of a socket securely.

2. Description of Related Art

A conventional hexagonal wrench has a head for insertion into a socket and rotating a socket head screw. However, an inner surface of the socket will be worn, enlarged and rounded due to frequent use. Consequently, the head slips in the socket and a relative rotation between the head of the conventional hexagonal wrench and the socket will easily happen during operation. This is inconvenient and ineffective in use.

To overcome the shortcomings, the present invention tends to provide a hexagonal wrench to mitigate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the invention is to provide a hexagonal wrench capable of engaging an inner surface of a socket head screw.

A hexagonal wrench has a head. The head has an end surface, six equal side surfaces and at least one groove. Each side surface has a left edge segment and a right edge segment adjacent to the left edge segment of an adjacent side surface. The at least one groove is formed in at least one of the right edge segments and the left edge segments and extends to the end surface. Therefore, the head can engage securely an inner surface of a socket to rotate the socket even when the socket is worn or rounded.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

With reference toFIGS. 1 to 3, a first embodiment of a hexagonal wrench in accordance with the present invention is an L-shaped rod and comprises a head10. The head10has a hexagonal cross section and is used for insertion into a socket A1of a socket head screw A, as shown inFIG. 4. The head10has an end surface11, six equal side surfaces12and at least one groove121. The end surface11is flat. Each side surface12has a right edge segment122and a left edge segment122. The right edge segment122of each side surface12is adjacent to the left edge segment122of the adjacent side surface12. Accordingly, six corners Q are respectively formed by the right edge segments122and the left edge segments122.

The at least one groove121is formed in at least one of the right edge segments and the left edge segments of the side surfaces12so as to make at least one of the corners Q become acute. The at least one groove121extends to the end surface.

In the first embodiment of the hexagonal wrench in accordance with the present invention, three of the side surfaces12that are arranged at intervals are categorized as a first unit. The other three of the side surfaces12are categorized as a second unit. Each side surface12of the first unit has two grooves121respectively formed in the right edge segment122and the left edge segment122of the side surface12. Accordingly, six grooves121and six acute corners Q are implemented.

Each groove121is elongated along a direction which is parallel to an axis of the head10. Preferably, each groove121has a triangular cross section.

With further reference toFIG. 4, the head10is inserted into the socket A1. If an inner surface of the socket A1is worn and becomes enlarged or rounded after frequent use, the head10can be rotated clockwise or counterclockwise a little bit to make the acute corners Q engage securely the inner surface of the socket A1. Therefore, the head10can efficiently drive the socket A1to rotate.

Because each side surface12of the first unit has two grooves121, the head10is always capable of engaging the inner surface of the socket A1of the socket head screw A securely whether the head10rotates clockwise or counterclockwise.

With reference toFIG. 5, in a second embodiment of the hexagonal wrench in accordance with the present invention, each side surface12A has a groove121A formed in the right edge segment122.

With reference toFIG. 6, in a third embodiment of the hexagonal wrench in accordance with the present invention, two grooves121B are implemented. The grooves121B are respectively formed in the right edge segments122of two opposite side surfaces12B.

With reference toFIG. 7, in a fourth embodiment of the hexagonal wrench in accordance with the present invention, a single groove121C is implemented. And the groove121C is formed in the right edge segment122of one of the side surfaces12C.

As long as the head10can engage securely the inner surface of the socket A1, the present invention does not limit the number and the arrangement of the grooves121,121A,121B,121C.

From the above description, it is noted that the present invention has the advantage of that the head10can engage securely the inner surface of the socket A1to rotate the socket A1even when the socket A1is worn or rounded.