Torque enhancing wrench

Details Torque enhancing wrench Torque enhancing wrench

1999-12-20

2001-10-23

Eley, Timothy V. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Jaw faces

C081S058200, C081S176100, C081S125100

Reexamination Certificate

active

06305252

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wrench, and more particularly to a torque enhancing wrench.
2. Description of the Prior Art
A typical surface conforming torque enhancing wrench is disclosed in U.S. Pat. No. 5,131,312 to Macor and comprise an open end wrench having a number of flat contacting surfaces for engaging with and for driving fasteners or the tool members. The wrench includes an open end for allowing the fasteners to be disengaged from the flat contacting surfaces and to be rotated relative to the wrench body. The fasteners may not be driven by the wrench step by step without being disengaged from the wrench.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional wrenches.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a torque enhancing wrench including a number of flat contacting surfaces for engaging with and for driving a fastener and including an enclosed opening for receiving the fastener and for allowing the fastener to be disengaged from the flat contact surfaces and to be rotated relative to the wrench without being disengaged from the wrench.
In accordance with one aspect of the invention, there is provided a wrench comprising a handle including a first end having a head provided thereon, the head including an enclosed peripheral wall for defining an orifice therein and for receiving a fastener to be driven by the head. The head includes a first cusp and a second cusp extended inward of the orifice thereof and includes a first surface formed beside the first cusp and a second surface formed beside the second cusp for engaging with the fastener. The first cusp and the second surface are provided for driving the fastener in an active direction, and the second cusp and the first surface are provided for driving the fastener in a reverse direction. The fastener is allowed to be rotated relative to the head when the fastener is disengaged from the first and the second cusps and the first and the second surfaces, for allowing the fastener to be driven either in the active direction or in the reverse direction without being disengaged from the head.
The root portion of the head includes a curved surface formed therein having no cusps and flat surfaces formed therein.
The head further includes a third cusp and a fourth cusp extended inward of the orifice of the head and formed between the first and the second cusps, the third cusp is defined by a third and a fourth surfaces, the fourth cusp is defined by a fifth and a sixth surfaces. The first cusp and the second surface and the third surface and the fifth surface are provided for driving the fastener in the active direction, and the second cusp and the first surface and the fourth surface and the sixth surface are provided for driving the fastener in the reverse direction,
The head further includes a fifth cusp and a sixth cusp and a seventh cusp extended inward of the orifice of the head and formed between the first and the third cusps, and the third and the fourth cusps, and the fourth and the second cusps respectively, the fifth cusp and the sixth cusp and the seventh cusp each is defined by a pair of surfaces for engaging with and for driving the fastener.
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: 5131312 (1992-07-01), Macor
patent: 5476024 (1995-12-01), Hsieh
patent: 5595096 (1997-01-01), Coffman
patent: 6055890 (2000-05-01), Lim
patent: 6098501 (2000-08-01), Sundstrom
patent: 6158309 (2000-12-01), Baker

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