Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
1999-10-28
2001-08-28
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C192S043200
Reexamination Certificate
active
06279428
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a ratchet wrench which is able to bear greater working torque and achieve better using effect.
FIG. 7
shows a conventional ratchet wrench including a grip
9
and a ratchet
91
. Two clicks
92
are symmetrically pivotally disposed at one end of the grip
9
near the ratchet
91
. The free ends
921
of the two clicks
92
are able to respectively engage with the teeth
93
of the ratchet
91
. A spring
95
is disposed between each click
92
and a fitting member
94
fitted around the wrench. The spring
95
resiliently makes the click
92
engage with the teeth
93
of the ratchet
91
and permits the click
92
to be outward swung. Furthermore, a swinging block
96
is disposed between the two clicks
92
. The swinging block
96
serves to swing left and right to respectively push one click
92
away and permit the other click
92
to engage with the ratchet
91
, whereby the ratchet
91
can be only one-way rotated.
The clicks
92
are pivotally connected with the grip
9
to swing and engage with the ratchet
91
. However, when rotating the wrench with a great strength and the ratchet
91
is subject to a considerably great force, the click
92
may be outward biased and disengaged from the ratchet
91
(as shown in
FIG. 8
) or the pivot section of the click
92
may be broken and unable to engage with the ratchet
91
.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a ratchet wrench in which two stopper members are slidable within the recesses of the main body to abut against the ratchet so that the ratchet can be only one-way rotated. The stopper members are supported by the main body and the guide block and firmly located. It is impossible for the stopper members to displace outward. Therefore, in the case that the wrench is rotated by a greater force in working, the stopper members can also bear the greater force exerted onto the ratchet. Accordingly, the ratchet wrench can bear creater working torque to improve using effect of the ratchet wrench.
It is a further object of the present invention to provide the above ratchet wrench which is applicable to the ratchet with teeth projecting from outer side thereof.
According to the above objects, the ratchet wrench of the present invention includes:
a main body for a user to grip and wrench, a front end of the main body being formed with a receiving chamber equipped with a cover body, the main body and the cover body being respectively formed with two fitting holes at the receiving chamber, a back side of the main body being disposed with a grip section, two sides of the receiving chamber being respectively formed with two recesses;
a ratchet located in the receiving chamber of the main body, the ratchet having multiple teeth projecting outward, the ratchet having over one fitting section for fitting into the fitting holes of the main body and the cover body;
a switching unit which is a switching button for driving an engaging block, two sides of the engaging block being respectively formed with two hook sections; and
two stopper members respectively disposed in the recesses of the main body, an inner side of each stopper member being formed with an engaging section, a front end of each stopper member being formed with a stopper section, the hook section of the switching unit driving the engaging section of the stopper member, whereby the stopper sections are slidable within the recesses the stopper members respectively abut against the teeth of the ratchet, permitting the ratchet to only one-way rotate.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 2193984 (1940-03-01), Rhinevault
patent: 2201827 (1940-05-01), Froeschl et al.
patent: 5174176 (1992-12-01), Krivec
patent: 6047802 (2000-04-01), Huang
Rosenberg , Klein & Lee
Smith James G.
LandOfFree
Ratchet wrench does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ratchet wrench, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ratchet wrench will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2485197