1. Field of the Invention
The present invention relates to a hand tool, and more particularly to a wrench, the head of the wrench can be fixed at different angles with respect to the handle of the wrench.
2. Description of the Prior Art
The head of a conventional wrench is normally fixed to the handle, however, if a nut or a bolt to be driven is located in an unreachable corner of a narrow space, the conventional wrench is difficult to use. The inventor of the application has disclosed U.S. Pat. No. 6,928,904 “Hand tool having a quick deriving effect” and U.S. Pat. No. 7,373,861 “Pivoting assembly of a hand tool” to make a wrench whose head is rotatable with respect to its handle, so as to allow an effective use in a narrow space.
The head of the wrench of U.S. Pat. No. 6,928,904 is formed with a toothed hole, and the front end of the handle is formed a toothed locking portion. The toothed locking portion is engaged with the toothed hole of the head of the wrench. To change the angle between the head and the handle of the wrench, the handle must be lifted up to make the toothed locking portion disengage from the toothed hole of the head, so that the angle can be adjusted, and after adjustment, the tooted locking portion is inserted into the toothed hole again to make the handle fixed at the adjusted angle with respect to the head.
The head of the wrench of U.S. Pat. No. 7,373,861 is also formed with a toothed hole, and the front end of the handle is formed a toothed locking portion for engaging with the toothed hole, and similarly, the angle between the head and the handle of the wrench can also be adjusted by lifting the handle to disengage the toothed locking portion from the mounting hole.
However, the angle adjustment of the above two wrenches requires to lift the handle, namely, to make the handle move relatively to the head, so that the head can be disengaged from the handle. In such adjustment, the user has to use two hands to lift the handle with one hand and to hold the head with the other hand, this is inconvenient.
The primary objective of the present invention is to provide a wrench with a rotatable head, the head of the wrench can be easily disengaged from the handle.
A wrench with a rotatable head in accordance with the present invention comprises a handle and at least one head which are connected via a first end and a second end, and an angle of the head with respect to the handle being adjustable. The first end includes an upper lug and a lower lug. A first toothed hole is formed in the upper lug, and a through hole is formed in the lower lug. The second end is inserted in the space between the upper and lower lugs. A second toothed hole is formed in the second end and located between the first toothed hole and the through hole. A toothed pillar is movably engaged in the toothed holes. When the toothed pillar is moved to an engagement position, the pillar is synchronously engaged with the two toothed holes, so as to fix the head and the handle, and thus the angle between them is unadjustable. When the toothed pillar is moved to a disengagement position, the pillar is disengaged from the first toothed hole but still engaged with the second toothed hole, so that the head and handle are rotatable with respect to each other.
The present invention can be best understood through the following description and accompanying drawings.
Please referring to
The first end 20 is one end of the handle 12, and the second end 20 is one end of the head 14. It is understood that the first and second ends can be exchanged, namely, the first end 20 can be one end of the head 14, and the second end is one end of the handle 12. The other end of the head 14 is a driving end 16 for driving a nut. The driving end 16 can be an open end or a polygonal box end. The box end can also be a ratchet structure. Alternatively, the driving end 16 can be provided with a pillar (like the member 25 shown in FIG. 2 of U.S. Pat. No. 6,928,904) for engaging with sockets. The driving end is of conventional structure, so further explanation is omitted.
Referring to
The second end 30 is formed with a second toothed hole 32 and a plurality of teeth 34 formed on the inner surface of the toothed hole 32. The second end 30 is inserted in the space 24 and is located between the upper and lower lugs 21, 22. The second toothed hole 32 is aligned with the first toothed hole 25 and the through hole 27. In this embodiment, the lower end of the inner surface of the second toothed hole 32 is not provided with tooth and defines a hole portion 36 which is not a necessary structure of the present invention.
A toothed pillar 40 is formed around its periphery with a plurality of teeth 42. In this embodiment, the teeth 42 are formed only on the top side of the periphery of the toothed pillar 40, but can also be formed on the full area of the outer periphery of the pillar 40. The toothed pillar 40 is installed in the toothed holes 25, 32 and the hole 27, as shown in
The toothed pillar 40 can be moved to an engagement position as shown in
In use, as shown in
When pressing down the toothed pillar 40, the toothed pillar is moved to the disengagement position as shown in
When the toothed pillar 40 is moved from the engagement position to the disengagement position or from the disengagement position to the engagement position, the elastic positioning member 46 will slide over the restriction flange 28.
When releasing the first and second ends from the engagement position as shown in
While I have shown and described the preferred embodiment in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
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Number | Date | Country | |
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20100186557 A1 | Jul 2010 | US |