Gravity operated cable brake for an elevator

Brakes – Operators – Automatic

Reexamination Certificate

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Details

C188S065100, C188S188000, C188S139000

Reexamination Certificate

active

11300894

ABSTRACT:
A cable brake has an electromagnet releasably retaining a mass that falls down guide rods under the effect of gravity and impacts a first arm of a trigger lever. Upon impact by the mass, the trigger lever rotates a second arm with a pawl to release a crossbar, whereupon pressure springs press a moveable brake plate against a cable strand to halt the cable strand. A return mechanism utilizes a screw and cooperating nut or a coupler to return the moveable brake plate and pre-stress the pressure springs.

REFERENCES:
patent: 1738214 (1929-12-01), Thurston
patent: 1864588 (1932-06-01), Dunlop
patent: 1934508 (1933-11-01), McCormick
patent: 3327811 (1967-06-01), Mastroberte
patent: 3669223 (1972-06-01), Arnold
patent: 4923055 (1990-05-01), Holland
patent: 5101937 (1992-04-01), Burrell et al.
patent: 5197571 (1993-03-01), Burrell et al.
patent: 5217091 (1993-06-01), Shiina et al.
patent: 5228540 (1993-07-01), Glaser
patent: 5299661 (1994-04-01), Pramanik et al.
patent: 5628385 (1997-05-01), Yumura et al.
patent: 5653312 (1997-08-01), Kato
patent: 6223868 (2001-05-01), Wullimann
patent: 142 032 (1980-06-01), None
patent: 196 35 244 (1998-03-01), None
patent: 0 651 724 (1995-05-01), None
patent: WO94/02404 (1994-02-01), None

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