Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2000-03-09
2001-07-03
Banks, Derris H. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S060000, C081S061000, C192S044000
Reexamination Certificate
active
06253646
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a roller-type ratchet device, and more particularly to a roller-type ratchet device for a wrench.
2. Description of the Related Art
A conventional ratchet wrench in accordance with the prior art shown in
FIG. 27
comprises a driving head
50
defining a hole
51
for receiving a driving body
60
which is rotated by the driving head
50
so as to rotate a workpiece (not shown) such as a hexagonal nut, bolt or the like. The driving body
60
defines an actuating recess
61
for receiving an anti-reverse roller
70
and an elastic member
80
.
However, the anti-reverse roller
70
and the elastic member
80
are separately and are not easily mounted in the actuating recess
61
so that it is difficult to assemble and dismantle the ratchet wrench. In addition, the anti-reverse roller
70
is not actually pressed between the driving head
50
and the driving body
60
so that the driving body
60
cannot be efficiently driven by the driving head
50
.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a roller-type ratchet device for a wrench which includes a driving head, a receiving hole defined through the driving head, and a plurality of actuating recesses each defined in a wall of the receiving hole.
The ratchet device comprises a driving body secured in the receiving hole to rotate with the driving head and defining a hexagonal driving hole therein; a follower secured in the receiving hole to rotate with the driving head and located between the driving body and the driving head, the follower including a plurality of fixed portions each movably mounted in a respective one of the actuating recesses; a plurality of locking members each secured in a respective one of the fixed portions of the follower to move therewith, and each pressing the driving body; and a direction control knob pivotally mounted on the driving head and engaged with the follower for moving each of the locking members in the respective actuating recess between two different positions.
In accordance with another aspect of the present invention, there is provided a roller-type ratchet device for a wrench which includes a driving head having a receiving hole defined therethrough.
The ratchet device comprises a driving body secured in the receiving hole to rotate with the driving head and including an inner wall having a hexagonal driving hole therethrough, and an outer wall defining a plurality of anti-reverse recesses, each of the anti-reverse recesses including a first portion and a second portion having a depth smaller than that of the first portion; a follower secured in the receiving hole to rotate with the driving head and located between the driving body and the driving head, the follower including a plurality of fixed portions each mounted in a respective one of the anti-reverse recesses; and a plurality of anti-reverse rollers each secured in a respective one of the fixed portions of the follower to move therewith, and each pressing the first portion of the respective anti-reverse recess of the driving body.
REFERENCES:
patent: 5848561 (1998-12-01), Hsieh
patent: 5941140 (1999-08-01), Susksi
patent: 6112624 (2000-09-01), Chen
Banks Derris H.
Berry Jr. Willie
Rosenberg , Klein & Lee
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