Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Reexamination Certificate
2001-12-12
2003-12-09
Marcelo, Emmanuel (Department: 3654)
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
C254S356000
Reexamination Certificate
active
06659429
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a self-locking reduction device in which rotational force from an input shaft is surely transmitted to output means, while rotational force from the output means is prevented from being transmitted to the input shaft.
In a known spur-gear-type reduction device used in a winch, it is impossible to prevent rotational force from being transmitted to an input shaft without additional braking means.
In a worm-gear-type reduction device, by determining a lead angle less than a friction angle of a tooth surface, self-locking can be made at some extent. But, coefficient of friction can be less than expected value owing to sliding speed, vibration, running feature and lubrication to cause slacking accident and unreliable self-locking.
The inventor invented a reliable self-locking reduction device using a micro-tooth-number-difference composite hypocycloid which has two-step internal gear mechanism, and filed it as Japanese Patent Application No.11-210793 (Pub.No.2001-41293).
This reduction device was developed to have high reduction ratio of more than 40:1. But it is required to provide a reliable simplified self-locking reduction device having low reduction ratio of 8:1 to 40:1.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a reliable self-locking small high-functional reduction device and a winch in which it is used.
REFERENCES:
patent: 3985047 (1976-10-01), Therkelsen
patent: 4426064 (1984-01-01), Healy
patent: 4595173 (1986-06-01), Anderson
patent: 4854547 (1989-08-01), Oliphant
patent: 5290014 (1994-03-01), Fergison, Jr.
patent: 6209690 (2001-04-01), Kuivamaki et al.
patent: 6520483 (2003-02-01), Miyoshi et al.
patent: 2001-041293 (2001-02-01), None
Marcelo Emmanuel
McKee Voorhees & Sease, P.L.C.
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