Tools – Wrench – screwdriver – or driver therefor – Handle or shank
Reexamination Certificate
2000-02-24
2002-04-16
Meislin, D. S. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Handle or shank
C081S177850
Reexamination Certificate
active
06370990
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a handle structure for a tool, and more particularly to a handle structure for adjusting the arm of force of a tool.
2. Description of the Related Art
A first conventional tool
60
in accordance with the prior art shown in
FIGS. 32 and 33
comprises a shank
61
, a driving head
62
formed on a first end of the shank
61
, and a handle
66
mounted on a second end of the shank
61
. When a user exerts a force “F” on the handle
66
to rotate relative to the driving head
62
through a length of arc “S”, the moment of force exerted by the handle
66
of the tool
60
is equal to F×L. However, the moment of force exerted by the handle
66
of the tool
60
is fixed and cannot be adjusted, thereby limiting the versatility of the handle
66
, and thereby consuming the user's energy.
A second conventional tool
80
in accordance with the prior art shown in
FIGS. 34 and 35
comprises a shank
81
having two distal ends each formed with a driving head
82
, and a handle
86
mounted on a mediate portion of the shank
81
. However, the moment of force exerted by the handle
86
of the tool
80
is fixed and cannot be adjusted, thereby limiting the versatility of the handle
86
, and thereby consuming the user's energy.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a handle structure for a tool comprising a handle body slidably secured on the shank of the tool for adjusting an arm of force of the shank of the tool. The handle body has a slide channel defined therein for receiving the shank of the tool.
The handle structure further comprises a retaining device mounted between the handle body and the shank of the tool for retaining the handle body on the shank of the tool, and a restoring device mounted between the handle body and the shank of the tool so that the handle body can slide on the shank of the tool.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 4409866 (1983-10-01), McBride
patent: 5099724 (1992-03-01), Reddy, Jr.
patent: 5396820 (1995-03-01), Baker
patent: 5931065 (1999-08-01), Jackson et al.
patent: 6058814 (2000-05-01), Johnson
patent: 6092442 (2000-07-01), Macor
Chuck (Chen-Tsai) Chang
Meislin D. S.
Rosenberg , Klein & Lee
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