Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2002-06-07
2003-07-15
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
Reexamination Certificate
active
06591718
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a hand tool, and more particular to a ratchet wrench, which is easy to assemble components.
BACKGROUND OF THE INVENTION
A conventional ratchet wrench
90
, please refer to
FIG. 1
, is mainly constructed of a wrench handle
91
, a driving member
92
, a pawl
93
, a snap ring
94
, a sealing cover
95
and a spring
96
. The wrench handle
91
has a receiving portion
97
at an end thereof, in which provides an interior flange
98
and an annular slot
99
. The sealing cover
95
is installed at an end of the receiving portion
97
and the snap ring
94
is installed in the annular slot
99
to lock the sealing cover
95
for the rest elements being fixedly installed in the receiving portion
97
of the wrench handle
91
.
The sealing covers
95
are manufactured from a particular machine, so they have a stable quality. But, it needs a procedure to work the annular flange
98
and the annular slot
99
in the receiving portion
97
of the wrench handle
91
by a specific machine tool. The snap ring
94
needs an extending pliers to install it in the annular slot
99
and sometime the snap ring
94
will interfere with the driving member
92
to make it can not rotate freely. So, the conventional ratchet wenches
90
have a higher deficiency.
SUMMARY OF THE INVENTION
The primary objective of the invention is to provide a ratchet wrench, which has an easier way to assemble the components.
The second objective of the invention is to provide a ratchet wrench, which has a superior output power.
According to the objective of the invention, a ratchet wrench comprises a wrench handle having a receiving portion at an end thereof, in which provide a chamber at a side thereof and a slot in the chamber. A pawl is installed in the chamber having a teeth portion at a side thereof. A spring is installed in the chamber having an end thereof rested against the pawl and the other end thereof rested in the slot in the chamber. A driving member is rotatably received in the receiving portion and has an annular teeth portion at outer surface thereof to mesh with the teeth portion of the pawl and two engaging portions at opposite sides of the teeth portion respectively, and two covering members, each of which has a tube, an opening at central of the tube and an annular flange at an end of the tube. The covering members have the tubes thereof inserted into the spaces between the receiving portion of the wrench handle and the engaging portions of the driving member respectively in an interference fit with the engaging portions.
REFERENCES:
patent: 2696748 (1954-12-01), Relken
patent: 5388479 (1995-02-01), Sroka
patent: 5425291 (1995-06-01), Chang
patent: 6220123 (2001-04-01), Chen
Browdy and Neimark , P.L.L.C.
Meislin D. S.
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