Adjustable wrench

Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments

Reexamination Certificate

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Details

C081S129000

Reexamination Certificate

active

06568301

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention is related to an adjustable wrench which has simple structure and can truly one-way wrench a work piece.
FIGS. 6 and 7
show a conventional adjustable wrench
8
having a main body
81
. A fixed jaw
82
extends from one side of the main body
81
, while a handle
83
is pivotally connected with the other end of the main body
81
. A movable jaw
84
is slidably disposed in a slide slot
811
of the main body
81
. The movable jaw
84
has a push block
841
protruding out from the main body
81
. A driving section
831
is formed at front end of the handle
83
in the main body
81
. The driving section
831
abuts against a slide block
85
having a toothed section
851
. The driving section
831
serves to drive the slide block
85
to make the toothed section
851
thereof disengage from or engage with a toothed section
842
of the movable jaw
84
. When the handle
83
is clockwise wrenched to drive the slide block
85
to engage with the movable jaw
84
, the fixed jaw
82
and the movable jaw
84
can cooperatively clamp and wrench a work piece
9
such as a bolt or a nut. When the handle
83
is counterclockwise wrenched, the slide block
85
is moved away from the movable jaw
84
. Therefore, when the main body
81
is driven by the handle
83
, the movable jaw
84
is pushed open by the work piece
9
and idles. Accordingly, when reciprocally turned, the adjustable wrench
8
can only one-way wrench the work piece
9
.
The above structure is relatively complicated and is hard to manufacture. Moreover, when reciprocally turning the adjustable wrench
8
, the toothed section
851
of the slide block
85
will frequently reciprocally move to engage with or disengage from the toothed section
842
of the movable jaw
84
. As a result, the toothed section
851
of the slide block
85
and the toothed section
842
of the movable jaw
84
are subject to wear after a period of use. Such toothed sections can hardly further truly engage with each other. This will make the movable jaw
84
unable to firmly clamp a work piece
9
.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide an adjustable wrench in which the main body is formed with a hollow section. A slide block is transversely slidably disposed in the hollow section. An adjustment bolt is pivotally disposed on the slide block and engaged with the movable jaw. One side of the slide block adjacent to the handle is formed with a dented section. The handle has at least one stop member corresponding to the dented section for abutting against the slide block. When the handle is wrenched, the stop member abuts against and locate the slide block so as to fix the movable jaw. At this time, the fixed jaw and movable jaw can clamp and wrench a work piece. When the handle is wrenched in reverse direction, the stop member is disengage from the slide block, whereby the slide block and the movable jaw are pushed open by the work piece and idle. Accordingly, the adjustable wrench is durable and can one-way wrench the work piece.
The present invention can be best understood through the following description and accompanying drawings wherein:


REFERENCES:
patent: 1490903 (1924-04-01), Anderson
patent: 2562060 (1951-07-01), Pehrsson
patent: 2733626 (1956-02-01), Mesojedec
patent: 3349654 (1967-10-01), Nordgren
patent: 5297459 (1994-03-01), Stojanowski
patent: 5941142 (1999-08-01), Janson
patent: 6336384 (2002-01-01), Huang

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