Tools – Tool jaw – Adjustable relationship between jaw
Reexamination Certificate
2002-05-02
2003-12-16
Wilson, Lee D. (Department: 3723)
Tools
Tool jaw
Adjustable relationship between jaw
C081S358000, C081S413000
Reexamination Certificate
active
06662691
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a pair of pliers, and more particularly to an arresting device which is mounted between two handles of the plies for checking motion of the two handles.
BACKGROUND OF THE INVENTION
As shown in
FIGS. 11 and 12
, a pair of pliers
8
of the prior art comprises two handles
81
and
82
, between which an arresting device
9
and a recovery spring
83
are mounted. The arresting device
9
comprises a sleeve
91
and a rod
92
fitted into the sleeve
91
. The sleeve
91
is pivotally fastened at one end with the first handle
81
, whereas the rod
92
is pivotally fastened at one end with the second handle
82
such that other end of the rod
92
is fitted into other end of the sleeve
91
in conjunction with a spring
94
which is fitted over the other end of the rod
92
. The other end of the sleeve
91
is provided with a projection
911
extending therefrom for pivoting one end of a retaining member
93
. The retaining member
93
has a hole
931
with a hole diameter slightly greater than the outer diameter of the rod
93
. The retaining member
93
is provided with a control lever
932
extending therefrom. The spring
94
is located between the other end of the sleeve
91
and the retaining member
93
. The retaining member
93
is urged by the spring
94
to tilt such that the hole
931
of the retaining member
93
is fitted slantingly over the rod
92
. As the rod
92
is pushed into the sleeve
91
, the retaining member
93
is pushed away to enable the rod
92
to enter the sleeve
91
. In the meantime, the rod
92
is located by the retaining member
93
to prevent the rod
92
from being drawn out of the sleeve
91
. As a result, the two handles
81
and
82
of the pliers
8
can not be moved away from each other, so as to allow two jaws of the pliers
8
to remain in the state of holding a workpiece. The two handles
81
and
82
are set free by pressing the control lever
932
of the retaining member
93
to bring about the disengagement of the retaining member
93
with the rod
92
. The two handles
81
and
82
are thus forced by the spring
83
to move away from each other.
Such a prior art arresting device
9
as described above is limited in function in that it is capable of locating the handles of the pliers
8
in a unidirectional manner. As a result, the prior art pliers
8
can not be used to work on a variety of workpieces.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a pair of pliers with an arresting device which is free of the deficiency of the prior art arresting device described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by an arresting device which is disposed between two handles of a pair of pliers and is formed of a sleeve and a rod. The sleeve is pivotally fastened at one end with a first handle of the pliers, whereas the rod is pivotally fastened at one end with a second handle of the pliers. The sleeve is provided at other end with a receiving cell and a retaining piece which is disposed in the receiving cell such that one end of the retaining piece prsses against a projection of the receiving cell. The retaining piece has a movable end and a through hole with a hole diameter greater than an outer diameter of the rod. A spring is disposed between the retaining piece and one side wall of the receiving cell such that one end of the spring urged the retaining piece to enable the movable end of the retaining piece to sway so as to cause the through hole of the retaining piece to retain slantingly the rod. The receiving cell is provided with a pin corresponding in location to the movable end of the retaining piece. The pin is turned to cause the retaining piece to release the rod, thereby enabling the rod to move in two directions. The pin is provided at one end with a recess, and at other end with a control lever. As the control lever is turned such that the recess of the pin is corresponding in location to the retaining piece, the movable end of the retaining piece is in the free state, thereby enabling the retaining piece to be pushed by the spring force of the spring to retain the rod in such a manner that the retaining piece restricts unidirectionally the movement direction of the rod.
The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of two preferred embodiments of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 2777347 (1957-01-01), Sendoykas
patent: 6101908 (2000-08-01), Azkona
patent: 6467380 (2002-10-01), Azkona
Liauh W. Wayne
Wilson Lee D.
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