Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-01-24
2001-07-17
Eley, Timothy V. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063000, C081S063100
Reexamination Certificate
active
06260449
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a ratchet tool, and more particularly, to an improved ratchet tool that has a pawl member with a curved toothed surface which is engaged with the toothed member in the head of the ratchet tool so as to output a large torque.
BACKGROUND OF THE INVENTION
A conventional ratchet tool is shown in FIG.
1
and generally includes a head
1
with a toothed member
2
rotatably received in an interior
12
of the head
1
. A recess
11
is defined in an inside of the interior of the head
1
and a spring
12
and a ball
12
are received in the recess
11
. A pawl member
3
is pivotally received in the interior of the head
1
and has two distal ends. Each distal end has two teeth
30
so that either one of the two distal ends is engaged with the toothed member
2
to decide the effective direction of the output shaft. The pawl member
3
has a lever
35
connected thereto so that the user may switch the lever
35
to rotate the pawl member
3
. Nevertheless, when outputting a torque, there are only two teeth
30
on the distal end of the pawl member
3
engaged with the toothed member
2
so that it is difficult to output a large torque because the engagement force between the two teeth
30
and the toothed member
2
is not sufficient. In other words, the more the teeth of the pawl member are engaged with the toothed member, the larger the torque that the tool can apply.
The present invention intends to provide a ratchet tool that can applies a large torque. A pawl member has a toothed curved surface and a lot of teeth are defined in the curved surface so that are engaged with the toothed member so as to apply a large torque.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a ratchet tool comprising a head having a toothed member rotatably received therein and an output shaft extends from the toothed member. A frame is pivotably received in the head and has two plates extending therefrom, wherein one of the two plates has a slot defined therethrough and a recess defined in the frame for receiving a spring and a ball therein. A pawl member has a toothed curve surface in a first end of the pawl member and a rib extends from a second end of the pawl member so that the ball is urged against the second end of the pawl member. The toothed curve
4
, surface is engaged with the toothed member. A boss extends from the pawl member and is movably received in the slot.
The object of the present invention is to provide a ratchet tool wherein the pawl member has a toothed curved surface which includes a plurality of teeth which are engaged with the toothed member so that the ratchet tool bears a large torque.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 5499560 (1996-03-01), Aeschilman
patent: 5957009 (1999-09-01), McCann
patent: 6065374 (2000-05-01), Taggart
patent: 6070502 (2000-06-01), Chang
Baxley Charles E.
Berry Jr. Willie
Eley Timothy V.
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