Locking device of electric tool shaft

Details Locking device of electric tool shaft Locking device of electric tool shaft

1999-10-13

2001-01-23

Marmor, Charles A (Department: 3681)

Planetary gear transmission systems or components

Planet periphery surrounds axis of interacting gear

C475S168000, C192S003230

Reexamination Certificate

active

06176801

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a locking device of electric tool shaft, and more specifically, to a simpler device, which can drive the electric tool to rotate by electricity or manually, and has a function of unidirectional driving to slow down the rotation speed of the electric tool shaft.
BACKGROUND OF THE INVENTION
The electrical rotating tools in the prior arts commonly utilize electricity as a power source and have different designs, including plug type, recharge type, and plug/recharge type. The electric tool can serve as an electric drill when the chuck of the electric tool clamps a drill, or an electric screwdriver when the chuck of the electric tool clamps a driver. The plug type of electric tool may provide more driving force when the electric socket is available. The recharge type of electric tool, however, provides a convenient selection when the electric socket is not available or the electric socket is too far to connect with the wire. The recharge type of electric tool is sometimes not available when the stored electricity is not sufficient to drive the drill or the screwdriver, and can not recover by recharging at once. The plug type of electric tool will also be not available when the power is shut down. Therefore, the electric tool has to be operated by hand in such conditions. However, the active gear of the traditional electric tool is generally engaged with the gear set, which is engaged with the passive gear connected with the central axle. The passive gear becomes an active gear when the electric tool is forced to rotate by hand to serve as a hand drill or a hand screwdriver. The gear set is further connected with the active gear of the driving motor shaft. As a result, the drill or the screwdriver becomes idling, i.e.; the electric tool can not operate by hand. Moreover, although several improved electric tools, which prevent the output shaft from counter rotating, have been developed, e.g., Taiwan Patent No. 87218052, the structure is more complicated and difficult to manufacture. The present invention, thus, provides an electric tool with an improved locking device to overcome all the shortcomings in the prior arts.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a locking device of electric tool shaft, which uses a specific gear device coordinated with a driving output shaft to allow the output shaft to rotate forwards or backwards by a power source, which runs in only one direction. The output shaft can be locked without rotation when the power source stops.
Another object of the present invention is to provide a locking device of electric tool shaft, which uses a gear device to slow down the output shaft when the output shaft rotates in one uni-direction.
Based on the present invention, the locking device of electric tool shaft includes a central hole and a recess part, which are connected with each other. The central hole is inserted with an output shaft so that the spline shaft at one end of the output shaft extends into the recess part. The locking and slowing down device also includes an eccentric wheel set composed of a first eccentric wheel and a second eccentric wheel, which are connected with a first gear and a second gear, respectively, to move in opposite direction. The first gear and the second gear have a plurality of first through holes around a circle and second through holes around a circle, respectively. The protruding columns on the rotating plate penetrate through the first through holes and the second through holes, and each protruding column has an outer diameter smaller than the inner diameters of the first through holes and the second through holes. The first gear, the second gear, and the eccentric wheel set are placed within the recess part of the housing base. A spline hole is included in the center of the rotating plate and inserted with the spline shaft of the output shaft. The output shaft can be driven to rotate forwards or backwards with a function of slowing down when the eccentric wheel set is driven to rotate by a power source, and the output shaft can be driven to stop to rotate when the power source stops and drives the output shaft backwards.


REFERENCES:
patent: 4177887 (1979-12-01), Kellett et al.
patent: 5042207 (1991-08-01), Kirn
patent: 5460253 (1995-10-01), Ritter et al.
patent: 5616095 (1997-04-01), Pruitt
patent: 5624013 (1997-04-01), Tsai
patent: 5732805 (1998-03-01), Nakamura
patent: 5788021 (1998-08-01), Tsai
patent: 6010426 (2000-01-01), Nakamura

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