Reinforcement teeth structure for ratchet

Details Reinforcement teeth structure for ratchet Reinforcement teeth structure for ratchet

2002-11-07

2003-12-02

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

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

C081S058000

Reexamination Certificate

active

06655238

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a ratchet tool that has a toothed engaging ring rotatably received in the head of the tool and an adjacent angle 2-4 degrees is defined from a center of the engaging ring to any two adjacent teeth on the engaging ring.
BACKGROUND OF THE INVENTION
A conventional ratchet tool is shown in
FIGS. 1 and 2
and generally includes a head
10
with a hole
11
for receiving an engaging ring
20
therein and fastening clamps
13
are used to retain the engaging ring
20
in the hole
11
. A side hole
12
is defined in a side of the head
10
and communicates with the hole
11
. A pawl
21
is movably received in the side hole
12
and biased by a spring
22
. An end cap
23
seals the side hole
12
such that the pawl
21
and the spring
22
are retained in the side hole
12
. The pawl
21
has teeth
211
which are matched with the teeth
201
on an outer periphery of the engaging ring
20
. An inherent problem is that, as shown in
FIG. 3
, the torque output is small if the number of the matched teeth
211
and
201
is less than a certain amount of number. Gaps between the teeth
211
,
201
will be too large. As shown in
FIG. 4
, a larger number of the matched teeth
211
and
201
requires much precise machining processes and the teeth
211
,
201
could slide over each other because of the short height of the teeth
211
,
201
.
The present invention intends to provide reinforcement teeth structure for the engaging ring and the pawl so as to increase the torque that the ratchet tool can output.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a ratchet tool that includes a head with a hole in which an engaging ring is received, and a side hole is defined from a side of the head so as to receive a pawl biased by a spring therein.
The engaging ring has first teeth defined in an outer periphery thereof and which are engaged with second teeth defined in a side of the pawl. An adjust angle “a” of 2 to 4 degrees is defined between a center of the engaging ring and two points of two adjacent first teeth of the engaging ring. An angle “b” between two adjacent face of two adjacent second teeth is larger than an angle “c” between two faces of any first tooth. A height “D” of any of the first teeth is not less than a height “d” of any of the second teeth.
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, a preferred embodiment in accordance with the present invention.


REFERENCES:
patent: 810599 (1906-01-01), Ansorge
patent: 3838614 (1974-10-01), O'Donnell
patent: 5979274 (1999-11-01), Hsieh
patent: 6334373 (2002-01-01), Hsieh

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