Reversible ratchet wrench

Details Reversible ratchet wrench Reversible ratchet wrench

2003-12-04

2004-10-19

Hail, III, Joseph J. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

C081S060000, C081S063000, C192S038000

Reexamination Certificate

active

06805028

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a hand tool, and more particularly to a reversible ratchet wrench, which has an easier way of switching the wrenching orientation and has a simpler structure to reduce the cost of fabrication.
2. Description of the Related Art
FIG. 1
shows a conventional reversible ratchet wrench
1
having a handle
10
with a head portion
11
at an end thereof. The handle
10
is provided with a hole
12
, a first chamber
13
and a second chamber
14
at the head portion
11
, in which a ratchet wheel
20
, a pawl
21
and a switch device
22
are respectively installed. The ratchet wheel
20
has a teeth portion
201
at an annular outer surface thereof and the pawl
21
has a teeth portion
211
at a front side thereof for detachably meshing the teeth portion
201
of the ratchet wheel
20
. The pawl
21
makes the ratchet wheel
20
only turned along one orientation relative to the pawl
21
. The pawl
21
has a recess
212
at a rear side thereof. The switch device
22
is provided with a slot
221
, in which a spring
23
and a bullet
24
are installed. The bullet
24
is against the pawl
21
on a sidewall of the recess
212
thereof. The switch device
22
is switched to move the pawl
21
, such that the ratchet wheel
20
is switched the wrenching orientation thereof.
FIG. 2
shows another conventional reversible ratchet wrench
2
. The wrench
2
has two pawls
2
A and
2
B and a switch member
25
selectively engaged with one of the pawls
2
A,
2
B for changing the wrenching orientation of a ratchet wheel
26
.
The conventional reversible wrenches are complicated in structure and the costs of fabrication are high. That is where the conventional reversible wrenches should be improved.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a reversible ratchet wrench, which is simpler in structure to reduce the cost of fabrication.
The secondary objective of the present invention is to provide a reversible ratchet wrench, which works easily and stably when switching the wrenching orientation of the ratchet wheel.
According to the objectives of the present invention, a reversible ratchet wrench comprises a wrench body having a head portion that has a hole and a chamber communicated with the hole. A ratchet wheel is rotatably mounted in the hole of the wrench body. A pawl is moveably received in the chamber of the wrench body and meshed with the ratchet wheel. An annular cover is rotatably mounted on the head portion of the wrench body for preventing the ratchet wheel from escaping out of the hole of the wrench body. The annular cover has a driving member contactable to the pawl for driving the pawl to move to a position where the ratchet wheel can be forced to turn clockwise or counterclockwise.


REFERENCES:
patent: 6282993 (2001-09-01), Forman et al.
patent: 6666112 (2003-12-01), Hu

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