Tool driving or impacting – Impacting devices – Hammer head driven by relatively moving motion transmitting...
Reexamination Certificate
2003-08-26
2004-11-09
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head driven by relatively moving motion transmitting...
C173S093700, C173S121000, C081S463000, C081S466000
Reexamination Certificate
active
06814159
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tool driver, more particularly to an impact tool driver.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional impact tool driver is shown to include an elongated handle
1
, a solid holding member
2
, a compression spring
4
, and a socket
205
.
As illustrated, the handle
1
has an impact end
102
and a coupling end
103
opposite to the impact end
102
, and defines a spring-receiving chamber
105
adjacent to the coupling end
103
. The handle
1
is formed with a V-shaped cam hole
101
which is adjacent to the coupling end
103
and which is defined by a cam face
101
W.
The solid holding member
2
has a mounting end
202
and a coupling end
203
opposite to the mounting end
202
, and is formed with a pin hole
204
adjacent to the mounting end
202
. The mounting end
202
of the solid holding member
2
extends into the spring-receiving chamber
105
in the handle
1
in such a manner that the pin hole
204
in the holding member
2
is registered with the cam hole
101
in the handle
1
in a radial direction of the handle
1
. The socket
205
is mounted on the coupling end
203
of the holding member
2
, and has a non-circular retention hole for receiving a tool bit or a workpiece (not shown).
The compression spring
4
is disposed within the spring-receiving chamber
105
in the handle
1
, and abuts against the coupling end
202
of the holding member
2
.
The pin
3
extends through the pin hole
204
in the holding member
2
and the cam hole
101
in the handle
1
, and is in sliding contact with the cam face
101
W in such a manner that the cam face
101
W moves toward the coupling end
202
of the holding member
2
when an impact force is applied to the impact end
102
of the handle
1
, which, in turn, drives the pin
3
together with the holding member
2
to rotate relative to the handle
1
, thereby tightening or loosening the workpiece (not shown).
One disadvantage of the conventional impact tool driver resides in that the rigidity and strength of the handle
1
is weakened due to the formation of the spring-receiving chamber
105
and the cam hole
101
therein.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide an impact tool driver which includes a holding member formed with a spring-receiving chamber so as to overcome the aforesaid disadvantage of the prior art.
According to the present invention, an impact tool driver includes: an elongated handle including a solid and rigid shank that has an impact end and a coupling end opposite to the impact end, and that is formed with a V-shaped cam hole adjacent to the coupling end, the V-shaped cam hole being defined by a cam face; a hollow cylindrical holding member having an open end, a closed coupling end opposite to the open end, and a surrounding wall extending from the open end to the closed coupling end and defining a spring-receiving chamber accessible from the open end, the surrounding wall of the cylindrical holding member being formed with two diametrically disposed pin holes and being sleeved on the handle in such a manner that the coupling end of the handle and the cam hole are disposed in the spring-receiving chamber and that the pin holes in the cylindrical holding member are registered with the cam hole in the handle in a radial direction relative to the cylindrical holding member; a compression spring disposed within the spring-receiving chamber in the cylindrical holding member and abutting against the coupling end of the shank and the coupling end of the cylindrical holding member; and a pin extending through the pin holes in the surrounding wall of the cylindrical holding member and the cam hole in the handle, and in sliding contact with the cam face of the handle in such a manner that the cam face moves toward the closed coupling end of the cylindrical holding member against urging action of the compression spring when an impact force is applied to the impact end of the shank, thereby driving the pin to rotate, which, in turn, results in rotation of the cylindrical holding member relative to the handle.
REFERENCES:
patent: 376581 (1888-01-01), Byrnes
patent: 1661666 (1928-03-01), Maehren
patent: 3256946 (1966-06-01), Jansen et al.
patent: 3366187 (1968-01-01), Von Tersch
patent: 3783956 (1974-01-01), Schultz
patent: 4909216 (1990-03-01), Groddeck
patent: 5012709 (1991-05-01), Su
patent: 5908076 (1999-06-01), Marcengill et al.
patent: 6408951 (2002-06-01), Lin
Darby & Darby
Smith Scott A.
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