Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-09-29
2001-07-10
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S057300
Reexamination Certificate
active
06257097
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a ratchet tool that is required less force to rotate. The engaging member for connecting a socket is rotated one revolution while the ratchet tool is rotated multiple revolutions.
BACKGROUND OF THE INVENTION
A conventional ratchet tool
1
is shown in FIG.
1
and generally includes a head having a space
10
for receiving an operation member
11
therein and a hole
101
defined in a bottom of the head of the tool
1
so that a socket releasing rod
100
extends through the hole
101
and a passage
111
in the operation member
11
. A pawl member
12
received in the head of the tool
1
and has a curved toothed surface
120
for engaging with a toothed periphery
110
of the operation member
11
. The pawl member
12
is pivotally received in a pawl receiving member
13
in the head and a protrusion
121
is movably received in a slot
131
of the pawl receiving member
13
. A ball
140
and a spring
14
are received in a recess
132
in an inside of the pawl receiving member
13
. The ball
140
is biased by the spring
14
and contacts a positioning portion
122
of the pawl member
12
. A lever
130
extends from the pawl receiving member
13
and is accessed from an outside of the tool
1
so that when pushing the lever
130
, the pawl member
12
is pivoted and is positioned by the ball
140
pushing the positioning portion
122
. One of two sides of the pawl member
12
contacts against an inside of the head so that when the tool
1
is rotated in one direction to let the inside of the head push the pawl member
12
, a torque is applied to an object engaged with the operation member
11
. If the tool
1
is rotated in the other direction, the pawl member
12
pushes the ball
140
to compress the spring
14
, and the pawl member
12
moves over the teeth of the toothed periphery
110
of the operation member
11
while the operation member
11
is maintained still. However, the operation member
11
of the conventional ratchet tool can only be rotated one revolution as the tool
1
is rotated one revolution. This means that when an object is screwed so firm, the user has to apply a larger force to rotate the ratchet tool
1
so that if the user cannot apply such a large force, he/she has no choice to give up.
The present invention relates to a ratchet tool which has a disk with an engaging member extending therefrom for engaging with a socket and the disk has a flange having toothed inner periphery. A toothed rotator eccentrically and rotatably engages with the toothed inner periphery of the disk. A ratchet means is engaged with the rotator so that when the ratchet tool rotates multiple revolutions, the engaging member rotates one revolution. This means the user uses less force to rotate the socket.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a ratchet tool and comprising a ring-shaped head and a recess defined in an inner periphery of the head. A disk has an engaging member extending from a surface thereof and a flange extends from the other surface of the disk. The flange has a toothed inner periphery with which a rotator is engaged. An axis “P” of the rotator is located at a position which is eccentric to an axis “P
1
” of the disk. A pawl receiving member is received in the recess and a pawl member is pivotally and movably connected to the pawl receiving member. The pawl member has a toothed surface which is engaged with the rotator. A positioning means is located between the pawl receiving member and the pawl member. The positioning means urges the pawl member to engage with the toothed periphery of the rotator. The number of the teeth of the toothed inner periphery of the disk is larger than the number of the teeth of the rotator so that the ratchet tool is rotated multiple revolutions while the disk is rotated one revolution.
The primary object of the present invention is to provide a ratchet tool which can be rotated with less force.
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: 2542015 (1951-02-01), Ellison
patent: 2634630 (1953-04-01), Johnson
patent: 2680983 (1954-06-01), Miller
patent: 3828629 (1974-08-01), Moore
patent: 4475420 (1984-10-01), Atkinson et al.
Baxley Charles E.
Meislin D. S.
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