192 clutches and power-stop control – Clutches – Automatic
Reexamination Certificate
2000-12-29
2003-02-11
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Automatic
C081S063100, C192S108000
Reexamination Certificate
active
06516930
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a ratchet mechanism including a ring member engaged with two pawl members. The contact area between the pawl members and the ring member is increased to bear larger torque.
BACKGROUND OF THE INVENTION
A conventional ratchet mechanism for ratchet tools is shown in FIG.
1
and generally includes a ring member
10
having a polygonal inner periphery
11
for engaging a bolt, nut or the like, and teeth
13
defined in an outer periphery of the ring member
10
. Two pawl members
12
connected by a spring are used to engage with the teeth
13
of the ring member
10
, and each pawl member
12
has a toothed inner periphery
130
which is engaged with the teeth
13
. However, when the pawl members
12
are moved to engage the teeth
13
, only two or three teeth of the pawl members
12
are actually engaged with the teeth
13
in the ring member
10
. That is to say, the as 5 torque output is generated by the contact between the teeth
130
and the teeth
13
. Because the few number of the teeth
13
,
130
includes only a limited contact area, a high torque cannot be generated and the teeth
13
,
130
could be broken. For the compact size is a basic requirement of the hand tools so that it is hard to increase parts composing the ratchet mechanism.
The present invention intends to provide a ratchet mechanism including a ring member engaged with two pawls. The ring member has a toothed annular toothed wedge-shaped outer periphery and the pawl members each have a recessed toothed inside which is engaged with the ring member so as to have a larger contact area.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a ratchet mechanism for tools and comprising a ring member having an annular groove defined in an outer periphery thereof. First bevel teeth and second bevel teeth are respectively defined in the outer periphery of the ring member. The first bevel teeth and the second bevel teeth are separated by the groove. Two pawl members are connected by a spring and each pawl member has third bevel teeth and fourth bevel teeth. The third bevel teeth and the fourth bevel teeth are respectively engaged with the first bevel teeth and the second bevel teeth.
The primary object of the present invention is to provide a ratchet mechanism for tools wherein the contact area is larger than that of the conventional ratchet mechanism so as to output larger torque.
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: 5647 (1848-06-01), Semple
patent: 2978081 (1961-04-01), Lundin
patent: 3436992 (1969-04-01), Over et al.
patent: 3587365 (1971-06-01), De Gaston
patent: 4993288 (1991-02-01), Anderson et al.
patent: 5782147 (1998-07-01), Chaconas et al.
patent: 6148695 (2000-11-01), Hu
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