Force multiplier tool

Details Force multiplier tool Force multiplier tool

1995-07-10

1997-04-01

Wright, Dirk

Planetary gear transmission systems or components

Planet periphery surrounds axis of interacting gear

Circumferentially spaced connector pins

81 5731, F16H 132

Patent

active

056160950

ABSTRACT:
The force multiplier tool comprises a planocentric hypocycloidal gearing mechanism adapted for hand tool use. Specifically, the tool comprises a ring gear, a first and a second pinion gear disposed inside said ting gear and revolving about an input eccentric shaft, a plurality of drive pins, and an input shaft and an output shaft. The input eccentric shaft provides a camming action which force the pinions to revolve within the ring gear in a planocentric hypocycloidal path, said first and second pinion gears being separated in frequency by one hundred and eighty degrees. The pinion gears have a plurality of drive holes having diameters larger than the diameter of the drive pins such that when the pinion gears are rotating, the drive pins turn the output shaft. Importantly, the second pinion gear may be omitted and the number of drive pins and drive holes reduced to one while still allowing the tool to operate, although the use of two pinions provides better dynamic balance and continuous driving.

REFERENCES:
patent: 3861244 (1975-01-01), MacDonald
patent: 5123308 (1992-06-01), Shaffer
patent: 5176047 (1993-01-01), Bai et al.
patent: 5178046 (1993-01-01), Matsumoto et al.
patent: 5472384 (1995-12-01), Haga
Photographs of a scale model of a planocentric hypocycloidal gear manufactured by Ferguson Machine Company in existence at least as early as 1968.
Chironis, Nicholas P., Gear Design and Application, Chapter 3, "Planetary Gear Systems" by John H. Glover, McGraw-Hill Book Co., New York, New York, 1967.
Lynwander, Peter, Gear Drive Systems Design and Application, Marcel Decker Inc., New York, New York, 1983, pp. 6-11, 293-323.
Chironis, Nicholas P., Mechanisms & Mechanical Devices Sourcebook, Chapter 6 Subsection, "Planetary Gear Systems" by John H. Glover, McGraw-Hill Book Co., New York, New York, 1991, pp. 268-274.
Buckingham, Analytical Mechanics of Gears, Dover Publications, New York, New York, 1949 (approx.), pp. 25-29.
Walter Company catalog, Mar., 1987.
Ferguson publication BF-100, date unknown, but earlier than 1990.
Ferguson bulletin PT-67, date unknown, but earlier than 1990.
Ferguson catalog 764, date unknown, but earlier than 1990.
Norbar catalog, Jan., 1991.
Sumitomo Transmission Gear Division catalog, date unknown, but earlier than 1993.

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