Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2002-02-11
2003-02-11
Morgan, Eileen P. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063000
Reexamination Certificate
active
06516691
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is related to a ratchet tool which can be two-way switched to easily change the position of the ratchet block.
FIG. 6
shows a conventional two-way ratchet wrench. One end of the wrench is a head section
81
connected with a handle
82
. A ratchet
83
is mounted in the head section
81
. A tunnel
84
is radially formed at the conjunction between the head section
81
and the handle
82
. A ratchet rack
85
is fitted in the tunnel
84
. The ratchet rack
85
has two opposite ratchet sections and two dents
853
in which a locating steel bead
86
is pushed by a spring
87
and located. In normal state, the ratchet rack
85
is pushed by the steel bead
86
and the first ratchet section
851
is engaged with the ratchet
83
. One end of the ratchet rack
85
extends out of the tunnel
84
for a user to push so as to push the ratchet rack
85
and change the position thereof. At this time, the second ratchet section
852
of the ratchet rack
85
is engaged with the ratchet
83
and the rotational direction of the ratchet wrench is changed.
Such conventional ratchet wrench has some shortcomings as follows:
1. When working, the ratchet
83
of the head section
81
is fitted onto a bolt and the handle
82
is held to wrench the bolt. Accordingly, the stress is concentrated at the conjunction between the head section
81
and the handle
82
. However, the conjunction is formed with a tunnel
84
so that the strength of the conjunction is much weakened. Therefore, when wrenching the bolt, the wrench is hard to bear high torque and tends to break at the conjunction.
2. It often takes place that a user needs to operate the wrench in a narrow place. However, one end of the ratchet rack
85
protrudes from the wrench and tends to obstruct the operation when wrenching the wrench. Moreover, the protruding end of the ratchet rack
85
makes it quite inconvenient to fit the wrench onto the bolt.
FIGS. 7
to
10
show another type of conventional ratchet wrench
9
. The conjunction between the head section
91
and the handle
92
is formed with a receptacle
94
in which a ratchet block
93
is mounted. The receptacle
94
communicates with a socket
941
outward extending from the receptacle
94
through the wrench
9
. The socket
941
has a dent
942
formed on a side wall of the socket
941
. A driving block
95
is placed in the socket
941
and partially protrudes beyond the wrench
9
for a user to shift. A spring
97
is fitted around one end of a driving pin
96
which is fitted in a hole
952
of the driving block
95
. The other end of the driving pin
96
abuts against the wall of a recess
931
formed on the bottom of the ratchet block
93
as shown in FIG.
9
. One end of the spring
97
is finer, while the other end thereof is coarser. The rearmost end of the coarser end is enlarged to lean on outer side of the hole
952
. The free end of the finer end has a radially extending restricting bar
971
for abutting against and locating the driving pin
96
. One end of a locating pin
98
abuts against one end of the dent
942
, while the other end thereof is fitted in a spring
99
and inserted in a hole
953
of the driving block
95
.
When shifting the driving block
95
, the rear end of the locating pin
98
is moved from one end of the dent
942
to the other end thereof. The driving pin
96
is driven by the driving block
95
to move the ratchet block
93
to the other side so as to change the wrenching direction of the wrench
9
. The above conventional ratchet wrench
9
has some shortcomings as follows:
1. When shifting the driving block
95
, the driving block
95
is rotated about a fixed fulcrum to drive the locating pin
98
and the driving pin
96
. It is necessary for the user to overcome a resistant force for rotating the driving block
95
. Therefore, it is not so easy to rotate the driving block
95
.
2. As shown in
FIG. 9
, a spring
97
is fitted around the bottom end of the driving pin
96
, while the top end of the driving pin
96
directly abuts against the ratchet block
93
. The driving pin
96
itself has no resilience so that it is hard for the driving pin
96
to drive the ratchet block
93
.
3. One end of the spring
97
is finer, while the other end thereof is coarser. In addition, the free end of the finer end has a radially extending restricting bar
971
.
Therefore, it is troublesome to manufacture the spring
97
.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a ratchet tool in which the driving block can be easily shifted to change the position of the ratchet block. One side of the receptacle receiving the ratchet block is formed with a slot communicating with the receptacle and outward passing through the main body of the ratchet tool. A driving block is inlaid in the ratchet block. The driving block has a driving rod extending through and out of the slot to connect with a push button disposed on outer side of the main body. When pushing the push button, the driving rod is linearly moved within the slot, whereby the driving block drives the ratchet block to change the wrenching direction of the ratchet tool.
It is a further object of the present invention to provide the above ratchet tool in which the section of the driving rod extending out of the slot is a threaded section for screwing with the push button. By means of pushing the push button, the driving block can be easily switched.
It is still a further object of the present invention to provide the above ratchet tool in which the middle of the cavity is straight and not arched. Therefore, two ends of the cavity are farther from the leaning section of the spring, whereby the spring will push two ends of the cavity to move the ratchet block. This makes the ratchet block more truly located.
It is still a further object of the present invention to provide the above ratchet tool in which two ends of the spring are both tapered so that the contacting area between two ends of the spring and the leaning section and the cavity is reduced. This reduces the resistance against the shifting of the spring. Therefore, the ratchet block can be easily switched.
The present invention can be best understood through the following description and accompanying drawings wherein:
REFERENCES:
patent: 1078059 (1913-11-01), Mossberg
patent: 2185002 (1939-12-01), Pack
patent: 2735324 (1956-02-01), Goldwater et al.
patent: 6237447 (2001-05-01), Chen et al.
patent: 6282991 (2001-09-01), Hu
patent: 6282993 (2001-09-01), Forman et al.
Danganan Joni B.
Morgan Eileen P.
LandOfFree
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