Wrench

Details Wrench Wrench

2002-05-13

2004-06-29

Meislin, D. S. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S186000

Reexamination Certificate

active

06755098

ABSTRACT:

BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a wrench.
2. Related Prior Art
Referring to
FIG. 3
, a conventional wrench
10
includes a head (not numbered), a handle
11
extending from the head in a direction, and two jaws
12
and
13
extending from the head in an opposite direction. The jaw
12
includes a flat surface
121
. The jaw
13
includes a flat surface
131
. A throat
14
is formed between the jaws
12
and
13
. The throat
14
includes an arched surface (not numbered). In use, the head of the wrench
10
is engaged with a head of a bolt
20
. The flat surfaces
121
and
131
contact two facets
21
and
22
of the head of the bolt
20
, respectively. Two problems are encountered in use of the wrench
10
. Firstly, slipping happens between the flat surface
121
and the facet
21
and between the flat surface
131
and the facet
22
. Secondly, a corner
23
between two facets
26
and
27
may be worn out by the arched surface of the throat
14
, and corners
24
and
25
by the flat surfaces
121
and
131
, respectively.
Referring to
FIG. 4
, another conventional wrench
30
is devised to eliminate the first problem encountered in use of the wrench
10
. The wrench
30
includes a head (not numbered), a handle
31
extending from the head in a direction, and two jaws
32
and
33
extending from the head in an opposite direction. The jaw
32
includes a serrate surface
321
. The jaw
33
includes a serrate surface
331
. A throat
34
is formed between the jaws
32
and
33
. The throat
34
includes an arched surface (not numbered). In use, the head of the wrench
30
is engaged with a head of a bolt
20
. The serrate surfaces
321
and
331
contact facets
21
and
22
of the head of the bolt
20
, respectively, thus preventing slipping between the serrate surface
321
and the facet
21
and between the serrate surface
331
and the facet
22
. However, a corner
23
between two facets
26
and
27
may be worn out by the arched surface of the throat
34
, and corners
24
and
25
by the serrate surfaces
321
and
331
, respectively.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
SUMMARY OF INVENTION
It is an objective of the present invention to provide a wrench for firm engagement with a head of a bolt in use.
It is another objective of the present invention to provide a wrench that protects a head of a bolt in use.
According to the present invention, a wrench includes a head and a handle extending from the head in a direction. The head includes two jaws extending from the head in an opposite direction and a throat formed between the jaws. Each of the jaws includes a contact surface for contact with a facet of a head of a bolt. The contact surface of at least one of the jaws includes a plurality of teeth. The throat defines a central recess for receiving a corner of the head of the bolt.
The head may define a recess between the throat and each of the jaws.
The throat may include two flat contact surfaces for contact with two adjacent facets of the head of the bolt. The central recess defined in the throat is positioned between the flat contact surfaces of the throat.
In a first aspect, the wrench is a directional wrench that is often pivoted in an angular direction from a first one of the jaws through the throat to the second one of the jaws. The first jaw includes a plurality of teeth each including a crown.
The second jaw may include a plurality of teeth each including a crown. The crowns of the teeth formed on the second jaw are larger than the crowns of the teeth formed on the first jaw.
The first jaw may include four teeth. The second jaw may include first, second and third teeth. The crown of the first tooth formed on the second jaw is longer than the crown of the third tooth formed on the second jaw. The crown of the third tooth formed on the second jaw is longer than the crown of the second tooth formed on the second jaw.
In a second aspect, the wrench is non-directional. The contact surface of each of the jaws includes a plurality of teeth.
Other objectives, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the attached drawings.

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