Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2003-01-09
2004-09-14
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063100, C081S057290, C081S058000, C081S058100, C192S043000, C192S046000
Reexamination Certificate
active
06789449
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention
The present invention relates to a ratchet wrench, and in particular, to a wrench employing a ratchet block to change the direction of rotation of a tool.
(b) Description of the Prior Art
FIGS. 1 and 2
show a conventional ratchet wrench having a handle
10
with a head portion
11
. The head portion is provided with a tool connector cavity
12
, and the head portion
11
and the handle
10
are in communication with the cavity
12
of the tool connector
20
and between the head portion
11
and the handle
10
, a ratchet block cavity
13
and a trigger block cavity
14
are in communication with the tool connector cavity
12
.
The ratchet block cavity
13
and the trigger block cavity
14
are adapted for the ratchet block
22
and the trigger block
15
. The bottom face of the trigger block cavity
14
is a pivotal slot
140
. The wall face of the trigger block cavity
14
is a cavity hole
141
extended toward the handle
10
. The cavity hole
141
can adapt a top peg
160
and an elastic element
161
. The wall face of the trigger block
15
is formed into a trigger arch edge
151
for positioning of the trigger block
15
. The bottom face of the trigger block
15
is a pivotal block
150
corresponding to a pivotal slot
140
.
The extended edge of the trigger block
15
is provided with a cavity hole
152
containing a top peg
170
for supporting the ratchet block
22
and an elastic element
171
. The wall face corresponding to the ratchet block
22
is a positioning arch edge
23
, and the external edge of the tool connector
20
is formed into a ratchet teeth
21
corresponding to the ratchet block
22
, and the ratchet block
22
is used for the positioning of the rotation of the tool connector
20
. The top edge of the recess
12
is provided with a position-limiting structure
25
for locking the tool connector
20
within the head portion
11
.
The drawbacks of the conventional ratchet wrench are as follows:
The components for forming a ratchet wrench are too many, and therefore the cost of production is high;
The scope of tolerance is small and therefore, a small error will cause an ineffective operation of the ratchet wrench; and
The anti-torsional force is insufficient.
The tool connector cannot be replaced due to the use of the position-limiting structure
25
to lock the tool connector
20
within the head portion
11
.
Taiwanese Patent Publication No. 382300 discloses a ratchet wrench having a single-sided engagement to achieve the replacement of the tool connector. The disadvantage of this conventional ratchet wrench is that only a fastener is used to restrict the position and if the fastener is knocked or touched, the tool connector will be disengaged and therefore, it is inconvenient to use.
Accordingly, it is an object of the present invention to provide a ratchet wrench to mitigate the above drawbacks.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a ratchet wrench which will increase the anti-torsional force of the ratchet wrench.
Another object of the present invention is to provide a ratchet wrench having a handle end portion forming into a head portion containing a tool connector and a ratchet block, characterized in that the head portion has a tool connector cavity, and has a ratchet cavity adjacent to one side of the handle for communication with the tool connector, the ratchet block is positioned within the ratchet block cavity which can automatically move forward, the top face of the head portion corresponding to the top edge of the ratchet cavity is a notch for engaging with a covering plate; the middle section of the external edge is a tool connector formed into a position-limiting circular slot, and the ratchet block having a ratchet wall with ratchet teeth is provided with position-limiting block which can correspondingly engage with the circular slot, and the top face of the ratchet block is provided with a trigger rod extending through the covering plate, and the center of the covering plate has a corresponding T-shaped trigger recess, thereby obtaining a ratchet wrench.
Yet a further object of the present invention is to provide a ratchet wrench having a handle end portion forming into a head portion containing a tool connector and a ratchet block, characterized in that the head portion has a tool connector cavity, and has a ratchet cavity adjacent to one side of the handle for communication with the tool connector, the ratchet block is positioned within the ratchet block cavity which can automatically move forward, the top face of the head portion corresponding to the top edge of the ratchet cavity is a notch for engaging with a covering plate, wherein the external edge of the tool connector is a series of ratchet teeth and the ratchet block is engageable with the tool connector, and the top face of the ratchet block is provided with a trigger rod extending through the covering plate, and the center of the covering plate has a corresponding traverse trigger slot, thereby obtaining a ratchet wrench.
Other objects, and advantages of the present invention can be more fully understood by reading the following detailed description of the preferred embodiment, with reference to the accompanying.
REFERENCES:
patent: 5626062 (1997-05-01), Colvin
patent: 6164167 (2000-12-01), Chen
patent: 6408722 (2002-06-01), Chen
patent: 6453779 (2002-09-01), Hu
patent: 6457388 (2002-10-01), Chen
patent: 6457389 (2002-10-01), Hu
patent: 6516690 (2003-02-01), Chen
Grant Alvin J
Hail III Joseph J.
Lei Leong C.
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-3262610