Progressive safety device

Details Progressive safety device Progressive safety device

2007-11-27

2007-11-27

Mackey, Patrick (Department: 3654)

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific means contacting or on load support for...

Includes movable contact component on support for engaging...

C187S365000, C187S366000, C187S374000

Reexamination Certificate

active

11421176

ABSTRACT:
A progressive safety device for an elevator includes a brake unit and an actuating unit. The brake unit has a first brake shoe with first spring assemblies and a triangular rotatable support with second and third brake shoes. The actuating unit has an electromagnetic actuator with a locking bolt, a guide bolt with a coaxial compression spring and an actuating arm. On actuation, the compression spring moves the actuating arm against a guide rail whereby grooves on the actuating arm create a frictional engagement with the guide rail turning the actuating arm about a swivel bearing and through a follower turning the support. With the turning motion and the engagement of one of the second and third brake shoes with the guide rail, the first brake shoe is guided against the guide rail and generates the necessary braking force on the guide rail.

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patent: 5228540 (1993-07-01), Glaser
patent: 6446769 (2002-09-01), Kangiser et al.
patent: 6758310 (2004-07-01), Muff et al.
patent: 6942070 (2005-09-01), Ramseier et al.
patent: 2004/0149524 (2004-08-01), Mori et al.
patent: 1 205 418 (2002-05-01), None
patent: 1 283 189 (2003-02-01), None
patent: 1 449 800 (2004-08-01), None
patent: WO 00/39016 (2000-07-01), None

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