Worm-rack type transmission device

Details Worm-rack type transmission device Worm-rack type transmission device

2011-03-08

2011-03-08

Wilson, Lee D (Department: 3727)

Implements or apparatus for applying pushing or pulling force

Rack and pinion

Screw pinion

C254S100000, C254S098000

Reexamination Certificate

active

07900890

ABSTRACT:
In a worm-rack type transmission device (1), a curved side portion (6) is provided on rack teeth (2a) of a linear rack (2) in a manner to form a part of an ellipsoidal surface (E) and twisted by a changing rate (θ) of a torsional manner a toothed streak (5) of a worm wheel (3). The worm wheel (3) brings the toothed streak (5) into engagement with the curved side portion (6) in a line-to-line contact, enabling to a self-locking property and strengthening a transmission power to insure a high transmission efficiency with a least friction loss so as effectuate a linear drive for an extended distance travel with a high precision.

REFERENCES:
patent: 3903941 (1975-09-01), Eisenberg
patent: 4080915 (1978-03-01), Bompard et al.
patent: 5937459 (1999-08-01), Binaghi et al.
patent: 6231269 (2001-05-01), Shear et al.
patent: 7163207 (2007-01-01), Baird et al.
patent: 2009/0101877 (2009-04-01), Zaguroli, Jr.
patent: 2009/0267035 (2009-10-01), Wood et al.
patent: 2010/0044656 (2010-02-01), Imase
patent: S52-97498 (1977-08-01), None
patent: 09-328971 (1997-12-01), None
patent: 2007-120636 (2007-05-01), None

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