Tools – Wrench – screwdriver – or driver therefor – Slidable jaw adjustments
Reexamination Certificate
2003-03-12
2004-09-14
Hail, III, Joseph J. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Slidable jaw adjustments
C081S133000, C081S134000, C081S138000, C081S143000
Reexamination Certificate
active
06789451
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention.
The present invention relates generally to a hand tool, and more particularly to an adjustable wrench, which can hold a movable jaw when it is moved to a predetermined position.
2. Description of the Related Art
A conventional adjustable wrench comprised a handle having a fixed jaw at an end thereof, a movable jaw slidably provided on the handle having a rack and an adjusting worm pivoted on the handle and engaged with the rack of the movable jaw such that the movable jaw can be moved by turning the adjusting worm.
There must be a clearance of teeth left between the rack of the movable jaw and a helical tooth of the adjusting worm so that the adjusting worm can smoothly drive the movable jaw. But the movable jaw can not stand in a fixed position because of the clearance of teeth since the distance between the movable jaw and the fixed jaw can not be kept constant even though the adjusting worm has not been turned.
FIG. 8
shows a conventional apparatus for an adjustable wrench to secure a movable jaw
78
. The adjustable wrench has a hole
74
on a handle
72
and a fastening device
76
provided in the hole
74
. The fastening device
76
can be screwed into the hole
74
and press the movable jaw
78
to secure the movable jaw.
FIG. 9
shows a second conventional adjustable wrench having a screw bar
82
driven by a nut
80
to press a movable jaw
84
.
FIG. 10
shows a third conventional adjustable wrench having a rectangular slide
86
sliding transversely and against a worm
88
to make the worm
88
can not be turned.
FIG. 11
shows a fourth conventional adjustable wrench having a movable plate
90
with teeth
90
thereon engaged with clutch teeth
96
at a movable jaw
94
.
FIG. 12
shows a fifth conventional adjustable wrench having a locking disk
98
to secure an adjusting worm
100
.
FIG. 13
shows a sixth conventional adjustable wrench having a control mechanism
102
that moves a worm
104
against a movable jaw
106
.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide an adjustable wrench, which has an apparatus to secure the movable jaw to prevent the movable jaw from trembling when it has moved to any position.
According to the objective of the present invention, an adjustable wrench comprises a handle having a head portion and shank, wherein the head portion has a fixed jaw, a transverse guiding slot and an opening communicated with the guiding slot, a movable jaw having a guiding portion and a rack on the guiding portion, wherein the movable jaw receives the guiding portion in the guiding slot of the handle to be moved toward or away from the fixed jaw, an adjusting worm having a through hole at a center thereof and a helical tooth an outer surface thereof, wherein the adjusting worm is received in the opening and engages the helical tooth with the rack of the movable jaw whereby the adjusting worm is turned to drive the movable jaw to move along the guiding slot, and an adjusting device having at least a part thereof received in the through hole of the adjusting worm whereby the adjusting worm is turned freely relative to the adjusting device. The adjusting device is pivoted on the handle to be turned along a rotation axle and the adjusting worm is turned along a rotation axle and the rotation axle of the adjusting device deviates from the rotation axle of the adjusting worm whereby the adjusting device is turned to move the adjusting worm toward or away from the movable jaw.
REFERENCES:
patent: 4106372 (1978-08-01), Miller
patent: 4454791 (1984-06-01), Seward, III
patent: 6418819 (2002-07-01), Kuo
patent: 6679139 (2004-01-01), Brenizer
Bacon & Thomas PLLC
Grant Alvin J.
Hail III Joseph J.
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