Adjustable wrench

Details Adjustable wrench Adjustable wrench

2000-04-07

2001-10-23

Smith, James G. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

C081S125100, C081S145000, C081S177400

Reexamination Certificate

active

06305249

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an adjustable wrench, and more particularly, to one that allows easy and fast adjustment, and firm positioning.
2. Description of the Prior Art
In the prior art of the present invention as illustrated in
FIG. 7
, a wrench is provided with a handle
8
and a slide
9
. A multiple of tooth
81
is provided on one side of the handle
8
, a clamping member
82
to hold a bolt
7
is provided at the end of the handle
8
, an axis
91
is provided at one side of the slide
9
, said axis
91
is pivoted to a thumb
92
held against by a passive flexible tab
93
, and one end of said thumb
92
is provided with a multiple of tooth
921
to ratchet the tooth
81
from the handle
8
.
In use, a user has to press the thumb
92
to make the tooth
921
of the thumb
92
to disengage from the tooth
81
of the handle
8
before moving forward or backward the handle
8
to change the distance between the clamping piece
82
and the inner edge
94
of the slide
9
. In the process of moving the handle
8
, the tooth
921
from the thumb
92
must be completely cleared away from the tooth
81
of the handle
8
. While pressing the thumb
92
, the handle with inherited heavy weight must be pushed with a force that prevents an easy movement precisely by one tooth for the handle
8
. The difficulty in inching just for a distance of one tooth results in the creation of a space between the clamping piece
82
and the bolt
7
to be turned, and furthermore in the failure of securing the bolt
7
.
Whereas the thumb
92
is pivoted to the slide
9
by the axis
91
, and is ratcheted to the tooth from the handle
8
due to the plunging from the flexible tab
93
. In use, the thumb
92
must be pressed to completely disengage its tooth
921
from the tooth
81
of the handle
8
before pushing the handle
8
to adjust the distance between the clamping piece
82
and the inner edge of the slide
9
. In case of any failure to press the thumb
92
all the way to the end to move the handle
8
, the thumb
92
can get easily worn out since certain piece of the tooth
921
close to the axis
91
has not yet disengaged from the tooth
81
of the handle
8
. When said piece of the tooth
921
is worn out, with only the remaining tooth
921
ratcheted to the tooth
81
of the handle
8
resulting in sliding, thus to serious affect the positioning effect of the thumb
92
.
Furthermore, the distance between the clamping piece
82
and the inner edge
94
of the slide
9
is adjusted by pushing the handle
8
. Since the bolt
7
is available indifferent sizes, and the adjustment can only be achieved by the multiplex of pitch of the tooth
81
, the adjustment fails to be made exactly depending on the individual size of the bolt
7
. If the pitch of the tooth
81
is made wider, the greater ratcheting force is provided, but the range for adjustment gets narrower. On the contrary, if the pitch of the tooth
81
is made narrower, the ratcheting force gets too small to cause sliding.
SUMMARY OF THE INVENTION
The primary purpose of the present invention is to provide a wrench to facilitate easy adjustment by a very smooth slide that is used to adjust the spacing between the micro-adjustment and the first and the second planes respectively, as well as by an automatic restoration due to the bouncing force from a first flexible element.
Another purpose of the present invention is to provide a wrench that is capable of avoiding local tear and wear of the ratcheting block, and allowing sufficient contact and ratcheting force to be applied between the ratcheting block and the slide since the tooth from the slide can be ratcheted to or separated from the tooth of the ratcheting block at the same time.
Another purpose yet of the present invention is to provide a wrench that is capable of inching the spacing between the micro-adjustment and the first and the second planes respectively by rotating the micro-adjustment.


REFERENCES:
patent: 4084456 (1978-04-01), Pasbrig
patent: 4909107 (1990-03-01), Jeremic

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