Title:
OVER-CENTER TYPE LOCK APPARATUS FOR OFFICE EQUIPMENT
Document Type and Number:
Japanese Patent JPS58178766
Kind Code:
A
Abstract:
An over-centred lock arrangement for office forniture units (2) having at least one closable compartment (5) such as a drawer (26, 27) with a mechanism (6) to lock the compartment closed, and a top (3) extending the length of the unit. A primary lock (7) is mounted in the unit, and includes lock tumblers mounted in a plug or cylinder (8) which is rotatable between the locked and unlocked positions. At least one lock slide (43, 44, 90) is slidably mounted in the unit, and reciprocates to shift the compartment lock (6) between locked and unlocked positions. The lock slide is connected to the cylinder by a lock actuator assembly (10) which includes a crank arm (11) connected with the tumbler cylinder (8), and an actuator arm (12) having opposite ends pivotally connected with the crank arm and the lock slide respectively at first and second pivot points (13,14), whereby rotation of the tumbler cylinder (8) reciprocates the lock slide (43, 44, 90). In the locked position, the first and second pivot points (13, 14) assume an over-centred relationship with respect to the axis of rotation of the tumbler cylinder (8), whereby external forces applied to the lock slide in a direction to force the lock open, urge the tumbler cylinder further toward the locked position for improved security, and to prevent damage to the lock tumblers.
Inventors:
DAGURASU SHIIAHOON
Application Number:
JP4910283A
Publication Date:
October 19, 1983
Filing Date:
March 25, 1983
Export Citation:
Assignee:
STEELCASE INC
International Classes:
E05B65/46; E05C9/02; E05C9/00; (IPC1-7): E05B65/46
Attorney, Agent or Firm:
Yu Saito