Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-05-26
2001-10-23
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C192S043100
Reexamination Certificate
active
06305250
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to tools and more particularly to a ratchet device which is able to positive rotation, reverse rotation and/or stopped without rotation.
Typical ratchet device as shown in
FIGS. 1 and 2
comprises a tubular body
10
and a ratchet shaft
11
inserted into the body
10
through an opening
104
of the body
10
. The tubular body
10
has a first annular groove
101
in a middle periphery including a first thru hole
102
therein and a second thru hole
103
in a periphery between the first annular groove
101
and the opening
104
. The ratchet shaft
11
has a ratchet bar
111
on the inner end, a socket wrench on the outer end and a second annular groove
113
in a middle periphery between the ratchet bar
111
and the socket wrench
102
. When the ratchet shaft
11
is inserted into the tubular body
10
, a screw
105
is fastened into the second thru hole
103
and engaged within the second annular groove
113
of the shaft
11
so as to prevent the ratchet shaft
11
from transverse movement. A elastic clip
12
is engaged into the first annular groove
101
of the tubular body
10
and has a positioning block on the top including a central bore therein. A pawl
13
disposes into the central bore and is biased by a spring. The pawl
13
which can be rotated for 180 degrees has a bevel end engaged into the ratchet bar
111
so that the ratchet shaft
11
can be rotated positively and reversibly. Because of the unstability of the elastic clip
12
, this ratchet device can only provide limited torque. Further only positive and reverse rotations can not satisfy the requirement of the user.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide a ratchet device which provides greater torque and a convenient operation to perform positive and reverse rotations or stopped without rotation.
Accordingly, the ratchet device of the present invention comprises generally a tubular body, a ratchet shaft rotatably disposed into the tubular body and a control mechanism on the top of the tubular body in which a pair of pawls operated by a lever plate control the positive and reverse rotations and/or the stopping without rotation.
The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
REFERENCES:
patent: 4696208 (1987-09-01), Lay
patent: 5642794 (1997-07-01), Chuang et al.
patent: 5836430 (1998-11-01), Vasudeva
patent: 6151995 (2000-11-01), Shu
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