Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Reexamination Certificate
2002-01-25
2003-02-04
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle clutched to head
C081S063200
Reexamination Certificate
active
06513409
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ratchet wrench structure, and more particularly to a ratchet wrench structure which has a simple construction and may be processed easily.
2. Description of the Related Art
A conventional ratchet wrench structure in accordance with the prior art shown in
FIGS. 7 and 8
comprises a wrench body
50
, a ratchet wheel
60
, a pawl member
70
, and a control knob
80
.
The wrench body
50
has a distal end formed with a drive head
52
. The drive head
52
of the wrench body
50
has a first side formed with an operation space
520
for receiving the ratchet wheel
60
and the pawl member
70
, and a second side formed with a control space
522
for receiving the control knob
80
. The operation space
520
of the drive head
52
of the wrench body
50
has a top portion formed with an annular flange
521
, and a bottom portion formed with a depression
523
. The operation space
520
of the drive head
52
of the wrench body
50
has a wall formed with a recess
529
. The drive head
52
of the wrench body
50
is formed with a screw hole
525
and a receiving hole
528
located in the control space
522
of the drive head
52
of the wrench body
50
.
The ratchet wheel
60
is mounted in the operation space
520
of the drive head
52
of the wrench body
50
, and has an outer wall formed with multiple ratchet teeth
62
. A snap ring
64
is secured in the depression
523
of the operation space
520
of the drive head
52
of the wrench body
50
, so that the ratchet wheel
60
may be retained in the operation space
520
of the drive head
52
of the wrench body
50
by the annular flange
521
and the snap ring
64
.
The pawl member
70
is pivotally mounted in the operation space
520
of the drive head
52
of the wrench body
50
, and has a first side formed with multiple engaging teeth
72
detachably meshing with the ratchet teeth
62
of the ratchet wheel
60
, and a second side formed with a recess
76
for receiving a first end of a spring
74
whose second end is received in the recess
529
of the operation space
520
of the drive head
52
of the wrench body
50
. The pawl member
70
is provided with two rods
78
.
The control knob
80
is rotatably mounted in the control space
522
of the drive head
52
of the wrench body
50
, and is formed with a control lever
81
for rotating the control knob
80
. The control knob
80
is formed with a slot
85
for receiving the two rods
78
of the pawl member
70
. A screw
87
is extended through a counterbore
82
formed in the control knob
80
, and is screwed into the screw hole
525
of the wrench body
50
. The control knob
80
is formed with multiple positioning holes
84
. A spring
86
is received in the receiving hole
528
of the wrench body
10
, for urging a ball
88
which may be positioned in one of the positioning holes
84
of the control knob
80
.
In operation, the control knob
80
may be rotated to turn the two rods
78
of the pawl member
70
, thereby pivoting the pawl member
70
, so that the engaging teeth
72
of the pawl member
70
may mesh with the ratchet teeth
62
of the ratchet wheel
60
, so as to rotate a workpiece.
However, such a conventional ratchet wrench structure has a very complicated construction, so that it cannot be processed easily. For example, the control knob
80
needs to be processed with a slot
85
, a counterbore
82
, and multiple positioning holes
84
, the pawl member
70
needs to processed with a recess
76
and two rods
78
, and the wrench body
50
needs to be processed with a recess
529
, a screw hole
525
and a receiving hole
528
. In addition, the spring
74
is easily detached from the recess
76
of the pawl member
70
and the recess
529
of the wrench body
50
, thereby jamming and failing the conventional ratchet wrench structure.
SUMMARY OF THE INVENTION
The present invention has arisen to mitigate and/or obviate the disadvantage of the conventional ratchet wrench structure.
The primary objective of the present invention is to provide a ratchet wrench structure which has a simple construction, and may be processed easily.
Another objective of the present invention is to provide a ratchet wrench structure which may be assembled and dismantled conveniently and easily.
A further objective of the present invention is to provide a ratchet wrench structure, wherein the control spring is secured on the pawl member and retained by the control rod, so that the control spring may be positioned rigidly and stably without detachment.
In accordance with the present invention, there is provided a ratchet wrench structure, comprising: a wrench body, a ratchet wheel, a pawl member, and a control knob, wherein:
the wrench body has a distal end formed with a drive head, the drive head of the wrench body has a first side formed with an operation space for receiving the ratchet wheel, and a second side formed with a control space for receiving the control knob, the drive head of the wrench body is formed with a connecting space connected between the operation space and the control space for receiving the pawl member;
the ratchet wheel is mounted in the operation space of the drive head of the wrench body, and has an outer wall formed with multiple ratchet teeth;
the pawl member is pivotally mounted in the connecting space of the drive head of the wrench body, and has a first side and a second side, the first side of the pawl member is formed with multiple engaging teeth detachably meshing with the ratchet teeth of the ratchet wheel, a control spring has a first end secured to a center of the second side of the pawl member, and a second end provided with a control ring that is extended into the control space of the drive head of the wrench body; and
the control knob is rotatably mounted in the control space of the drive head of the wrench body, and has a side integrally formed or provided with a control lever for rotating the control knob, a control rod is eccentrically secured on a bottom of the control knob to rotate with the control knob, and is passed through the control ring of the control spring, for moving and displacing the control ring of the control spring.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 5957009 (1999-09-01), McCann
patent: 6164167 (2000-12-01), Chen
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