192 clutches and power-stop control – Stop mechanism – Limit stop
Patent
1993-01-07
1994-09-13
Bonck, Rodney H.
192 clutches and power-stop control
Stop mechanism
Limit stop
74 8915, 192143, F16D 7100
Patent
active
053460456
ABSTRACT:
A linear actuator has reversible electric motors driving a screw-threaded shaft engaging a roller nut. A tubular housing attached to the nut has at its remote end an internal seating member and load securing lugs. An hydraulic shock absorber unit, providing linear deceleration, is normally held in its most relaxed condition between the seating member and an end of a spacer tube butting against the nut. When the nut is within the shock absorber stroke distance of the driven end of the shaft, the free end of the shaft compresses the shock absorber unit against the seating. When the nut is within shock absorber stroke distance of the free end of the shaft, a ring engages a stop collar, thereby holding the shock absorber body at a fixed distance from the free end of the shaft, and the spacer tube compresses the shock absorber unit. A centrifugal brake is provided on a drive coupling pulley, and restrains rotation of the shaft above a predetermined rate.
REFERENCES:
patent: Re25659 (1964-10-01), Chapman et al.
patent: 1677108 (1928-07-01), Johnson
patent: 3207005 (1965-09-01), Geyer
patent: 4064981 (1977-12-01), House et al.
patent: 4635491 (1987-01-01), Yamano et al.
patent: 4712441 (1987-12-01), Abraham
patent: 4721196 (1988-01-01), Layer et al.
Rolaram Leaflet; Fortune Engineering Systems; Glasgow, Scotland (2p).
Ransey Silent Inverted Tooth Chain catalog; Huddersfield, England (12p).
Spiracon Roller Screw Leaflet; Fortune Engineering Systems, Blantyre, Scotland (2p).
Industrial Shock Absorbers Catalog, Ace Controls, Inc., Farmington, MI (12p).
Bennett George R.
Faithfull Terence F. H.
Bonck Rodney H.
Link-Miles Limited
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