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US 4,228,873 AGranted
Elevator door safety mechanism
AssigneeTri-County Elevator Co., Inc.
InventorGeorge L. Nyborg, Jr.
Life of this patent
Estimating the term…
Abstract
An elevator shaft door safety mechanism which permits the shaft door to be opened by authorized persons when the elevator is not in place. The mechanism is particularly suitable for use with doors of the hingedly mounted type. The mechanism is lock controlled and permits manual operation of the latching mechanism with the use of a special tool.
Claims7
A safety mechanism for an elevator shaft door which is hingedly mounted to a door frame, comprising in combination:
- latching means to latch said door to said door frame, said latching means including bolt means,
- keeper means mounted on said door for engagement with said bolt means of said latching means,
- said latching means including first and second latch releasing means to free said keeper means from said engagement to said bolt means to permit said door to open,
- said first latch releasing means being operated by the presence of an elevator proximate to said door,
- said second latch releasing means including a rod mounted therein, said rod being in engagement with said bolt means, said rod being manually operable to release said engagement of said keeper means by said bolt means,
- an aperture in at least one of said door and said door frame to permit access to said second latch releasing means;
- and
- lock means releaseably engageable with said aperture to seal said aperture when said lock means are in place and to permit access to said aperture when said lock means are removed.
5 more elements
Dependencies are inferred from the claim text.