Tools – Wrench – screwdriver – or driver therefor – Sliding jaw – handle-lever grip
Reexamination Certificate
2000-01-20
2001-05-08
Eley, Timothy V. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Sliding jaw, handle-lever grip
C081S127000, C081S146000, C081S090100
Reexamination Certificate
active
06227079
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tool, and more particularly to a self adjusting tool.
2. Description of the Prior Art
Typical adjusting wrenches comprise a fixed jaw and a movable jaw adjusted relative to the fixed jaw for clamping and for driving fasteners. The movable jaw may not be self adjusted relative to the fixed jaw and should be adjusted by the users.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional tools.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a tool including a self adjusting mechanism for allowing the tool to drive the fasteners without being disengaged from the fasteners.
In accordance with one aspect of the invention, there is provided a tool comprising a head including a first end having a first jaw provided thereon and including a second end, a second jaw slidably engaged in the head and movable toward and away from the first jaw for clamping a fastener to be driven between the first and the second jaws, and a handle including a first portion pivotally secured to the first end of the head at a pivot shaft and including a second portion selectively engaged with the second end of the head to force the second jaw toward the first jaw and to engage with the fastener.
A limiting means is further provided for limiting a rotational movement of the handle relative to the head about the pivot shaft and includes an oblong hole formed in the second portion of the handle, and a pin secured in the second end of the head and slidably received in the oblong hole of the handle to limit the rotational movement of the handle relative to the head.
The head includes a groove formed therein, the second jaw includes a protrusion extended therefrom and slidably engaged in the groove of the head for guiding the second jaw to move toward and away from the first jaw. A spring biasing means is further provided for biasing the second jaw toward the first jaw to lock the fastener between the first and the second jaws. The head includes a cover plate secured thereto for slidably retaining the second jaw in the head.
The second portion of the handle includes an actuator for engaging with the second jaw and for forcing the second jaw toward the first jaw. The second jaw includes a rack provided thereon, the actuator of the handle is engaged with the rack of the second jaw for forcing the second jaw toward the first jaw.
One or more first gears are rotatably secured in the head and engaged with the rack, a second gear is rotatably secured in the head and engaged with the first gears, the actuator of the handle is engaged with the rack of the second jaw with the first and the second gears for forcing the second jaw toward the first jaw. A pinion is received in the handle and selectively engaged with the first and the second gears when the second portion is forced toward the second end of the head. The handle includes a depression formed therein for receiving the first and the second gears and the pinion. A spring biasing device is further provided for biasing the second portion of the handle away from the second end of the head.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 4995297 (1991-02-01), Richards
patent: 5231904 (1993-08-01), Masbaum
patent: 5568752 (1996-10-01), Alford
patent: 5682802 (1997-11-01), Mazzone
Berry Jr. Willie
Eley Timothy V.
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