Information
-
Patent Grant
-
6389932
-
Patent Number
6,389,932
-
Date Filed
Friday, October 27, 200023 years ago
-
Date Issued
Tuesday, May 21, 200222 years ago
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Inventors
-
Original Assignees
-
Examiners
- Smith; James G.
- Shakeri; Hadi
Agents
-
CPC
-
US Classifications
Field of Search
US
- 081 62
- 081 60
- 081 61
- 081 63
- 081 631
- 081 632
- 192 43
- 192 431
-
International Classifications
-
Abstract
A ratchet wrench including a main body, a shaft rod having a protruded pillar and a gear, an insertion plate, two check plates, a dial seat, and a housing. The shaft rod is provided with a skidproof head pivoted thereto. The skidproof head has a toothed hole through which the gear of the shaft rod is positioned. The shaft rod is provided in the midsegment with a rear stepped edge which is slidably disposed in an inner fitting hole of the front segment of the skidproof head. The shaft rod is further confined by a bracing element which is disposed between the rear stepped edge and the toothed hole.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a wrench, and more particularly to a ratchet wrench.
2. Description of Related Art
As shown in
FIGS. 1 and 2
, a ratchet wrench
10
of the prior art has a handle
11
and a main body
12
which is provided with a center axial hole
14
with a core pillar
13
for pivoting a shaft rod
17
. The shaft rod
17
is provided with a gear
15
and a core hole
16
. The main body
12
is further provided with an insertion slot
18
for retaining an insertion plate
19
, two check plates
20
, and a dial seat
22
having two elastic press plates
21
. The main body
12
is fitted into a housing
24
with a position confining hole
23
. The housing
24
is provided with a notch
25
for retaining a projection
26
of the main body
12
. The main body
12
is provided at the front end with a locking member
28
with a carrying hole
27
.
Such a prior art ratchet wrench as described above is defective in design in that the locking member
28
is apt to unfasten to unable to control the shaft rod
17
, and that the shaft rod
17
can not be easily aligned, and further that the shaft rod
17
is not structurally strong to sustain the torsion. In addition, the shaft rod
17
is complicated in construction and is therefore not cost-effective. Furthermore, the locking member
28
is apt to catch the machining chips which can inflict injuries on a person's hand at such time when the ratchet wrench
10
is in action.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a ratchet wrench is free of the deficiencies of the prior art ratchet wrench described above.
The objective, features and functions of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1
shows an exploded view of a ratchet wrench of the prior art.
FIG. 2
shows a perspective view of the ratchet wrench of the prior art in combination.
FIG. 3
shows an exploded view of a ratchet wrench of the present invention.
FIG. 4
shows a schematic view of the ratchet wrench of the present invention in use.
FIG. 5
shows a longitudinal sectional view of the ratchet wrench of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
As shown in
FIGS. 3
,
4
, and
5
, a ratchet wrench
30
embodied in the present invention comprises a handle, a main body, a shaft rod, a skidproof head, two check plates, a dial seat, an insertion plate, a housing and a bracing element, which are described hereinafter.
A handle
49
has a recess to receive fastening seat
31
.
A main body
32
is provided at one end with a fastening seat
31
which is embedded in the handle
49
, and at other end with a center axial hole
34
having a core slot
33
. The main body
32
is provided in the top with two locating slots
38
in communication with the center axial hole
34
. The main body
32
is further provided in the bottom with an insertion slot
42
. The main body
32
has an annular protruded edge
46
located at the front thereof and provided in rear edge with a recess
48
.
A shaft rod
37
is provided in the midsegment with a rear stepped edge
52
, and in the tail end with a gear
35
and a protruded pillar
36
. The shaft rod
37
is received in the center axial hole
34
such that the protruded pillar
36
is received in the core slot
33
, and such the gear
35
is located in the center axial hole
34
.
A skidproof head
50
is joined with the shaft rod
37
and is provided with a toothed hole
51
for receiving a portion of the shaft rod
37
. The rear stepped edge
52
is slidably disposed in an inner fitting hole
53
of the front segment of the skidproof head
50
. Located between the rear stepped edge
52
and the toothed hole
51
is a bracing element
54
. Slot
50
a
on skidproof head
50
receives an end
46
of main body
32
and an end edge of housing
45
.
Two check plates
39
are pivoted in the two locating slots
38
such that the check plates
39
are engaged with the gear
35
.
A dial seat
41
is mounted across the two check plates
39
and is provided in the bottom with two elastic press plates
40
and in the top with a dial button
410
.
An insertion plate
43
is inserted from the insertion slot
42
into the center axial hole
34
such that the insertion plate
43
is disposed at the front edge
35
a
of the gear
35
.
A housing
45
is used to house the main body
32
such that the front edge of the housing
45
is stopped at the annular protruded edge
46
of the main body
32
, and that the stop element
47
is received in the recess
48
of the main body
32
, and further that the dial button
410
of the dial seat
41
is jutted out of the housing
45
via the position confining hole
44
of the housing
45
.
The bracing element
54
is located in the inner fitting hole
53
of the skidproof head
50
. The gear
35
is mounted by the insertion plate
43
. The housing
45
is secured in place by the stop plate
47
and the recess
48
. The axially-sliding allowance of the shaft rod
37
is eliminated by the bracing element
54
of the skidproof head
50
. The shaft rod
37
is securely confined by the skidproof head
50
. In addition, the structural strength of the shaft rod
37
is reinforced by the protruded pillar
36
and the core slot
33
of the center axial hole
34
.
Claims
- 1. A ratchet wrench comprising:a handle; a main body having a fastening seat at one end and a center axial hole at an opposite end, said fastening seat retained in said handle, said main body having a core slot at an end of said center axial hole, said main body having two locating slots formed therein in communication with said center axial hole, said main body having an annular protruding edge at a front end thereof, said main body having an insertion slot and a recess; a shaft rod having a stepped portion at a midsegment thereof, said shaft rod having a gear at a tail end thereof, said shaft rod having a protruded pillar extending outwardly from said gear, said shaft rod being received in said center axial hole such that said protruded pillar is received in said core slot, said gear being positioned in said center axial hole; a skidproof head receiving said shaft rod, said skidproof head having a toothed hole, said shaft rod having a portion between said gear and said stepped portion extending through said toothed hole, said skidproof head having an inner fitting hole receiving said stepped portion of said shaft rod therein, said skidproof head having an annular slot formed at an end thereof, said annular slot receiving an end of said main body therein; a bracing element affixed between said stepped portion of said shaft rod and said toothed hole; two check plates respectively received in said two locating slots, said two check plates engaged with said gear; a dial seat mounted across said two check plates, said dial seat having two elastic press plates and a dial button; an insertion plate disposed in said center axial holes such that said insertion plate is positioned at a front edge of said gear; and a housing covering said main body such that a front edge of said housing is stopped at said annular protruded edge of said main body, said housing having a stop element received within said recess of said main body, said dial button of said dial seat extending outwardly through a hole in said housing, said housing having an end edge received within said annular slot of said skidproof head.
US Referenced Citations (9)