Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2001-04-02
2002-05-07
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063200
Reexamination Certificate
active
06382052
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a ratchet tool that has a control member engaged with the pawl and a torsion spring
34
is engaged with the control member.
BACKGROUND OF THE INVENTION
A conventional ratchet tool is shown in FIG.
1
and generally includes a ring-shaped head
40
and a toothed member
42
rotatably received in the ring-shaped head
40
. A pawl
41
has a toothed surface engaged with the toothed member
42
and a spring
43
is connected between the pawl
41
and a control member
44
. The control member
44
is rotated by the user to engage one of two ends of the pawl
41
with the toothed member
42
. Each of the two ends of the pawl
41
allows the pawl
41
to rotate a with the toothed member
42
or to move over the toothed member
42
. The spring
43
tends to reach its fatigue limit after a period of time of use. Besides, the direction of change for the ratchet mechanism often fails because the control member
44
cannot be rotated to a proper position.
The present invention intends to provide a ratchet tool that has a simple structure and is able to properly position the pawl member to perform desired functions.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a ratchet tool and comprising a shank and a ring-shaped head which has a toothed member rotatably received therein. A recess is defined in an inner periphery of the ring-shaped head and a pawl is received in the recess. The pawl has teeth in a front surface thereof so as to be engaged with the toothed member, and a spring biases a rear surface of the pawl. A chamber is defined beside the ring-shaped head and communicates with the recess. A control member is received in the chamber and has a protrusion which is engaged with a notch in a top of the pawl. A curved slot is defined through the control member and a shifting lever is connected to the control member. A torsion spring has a leg fixedly connected to a hole in the control member and the other leg of the torsion spring is located in the curved slot.
The primary object of the present invention is to provide a ratchet tool that has a flat control member and a torsion spring to achieve the ratchet purpose.
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: 5957009 (1999-09-01), McCann
patent: 6044730 (2000-04-01), Roberts et al.
patent: 6230591 (2001-05-01), Ling et al.
patent: 6260448 (2001-07-01), Chaconas
patent: 6260449 (2001-07-01), I-He
patent: 6282993 (2001-09-01), Forman et al.
Pro-Techtor Inter-national Services
Thomas David B
LandOfFree
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