Turning – Lathe – Work rest
Reexamination Certificate
1999-08-19
2001-05-08
Tsai, Henry (Department: 3722)
Turning
Lathe
Work rest
C082S112000, C074S574300
Reexamination Certificate
active
06227085
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power hand tool, and more specifically to a gyration/reciprocating action switching mechanism for a power hand tool, which shortens the spread of axles of the output shaft of the power hand tool, enabling the axial length of the power hand tool to be minimized for convenient holding of the hand.
2. Description of the Related Art
U.S. Pat. No. 5,711,380 discloses a rotate percussion hammer/drill shift device suitable for hand drill. The device is disposed at an output spindle of a drill to provide the drill with a percussion function. It comprises a stationary percussion cam, an output shaft that is connected to the output spindle of the drill in a coaxial manner wherein the output shaft can be selectively moved to a working position from a normal position. This output shaft further includes a rotary cam by which the output shaft may rotate synchronously with the spindle of the drill, and a clutch mechanism which retains the output shaft in the normal position and permits the output shaft to be moved to the working position. The percussion cam is in contact with the rotary cam, which is rotating such that the rotary cam generates a periodical hammer movement in the axial direction. Consequently, the output shaft is provided with a hammer movement. This design is functional. However, because this design is comprised of a great number of parts, its manufacturing cost is high, and its assembly procedure is complicated. Because of huge dimension and heavy weight, the user cannot hold the power hand tool for a long time.
SUMMARY OF THE INVENTION
It is one object of the present invention to provide a gyration/reciprocating action switching mechanism for a power hand tool, which shortens the spread of axles of the output shaft of the power hand tool, enabling the axial length of the power hand tool to be minimized for convenient holding of the hand. It is another object of the present invention to provide a gyration/reciprocating action switching mechanism for a power hand tool, which is inexpensive to manufacture, and easy to install. To achieve these and other objects of the present invention, there is provided a gyration/reciprocating action switching mechanism, which comprises an output shaft, a first clutch mounted on said output shaft, a second clutch mounted inside said first clutch and coupled to said output shaft, a torsional force adjustment mechanism mounted on a speed reduction mechanism of a power hand tool, and a gyration control device, wherein rotating the gyration adjustment device to a lower limit position forces the first axle sleeve of the first clutch into engagement with the second axle sleeve of the first clutch to shorten the stroke of the output shaft, thereby causing the first cam to be retained disengaged from the second cam by means of the effect of the spring force of a coil spring of the second clutch, for enabling the coil spring of the second clutch to be compressed to force the first cam into contact with the second cam and to let the output shaft be reciprocated upon pressing of the output shaft against an object.
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Fulwider Patton Lee & Utecht LLP
Tsai Henry
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