Patent · US Expired

Central locking equipment for vehicle doors

US4135377A · kind A · utility

86Cited by

11References

10Claims

0Family size

Assignee

Arn. Kiekert Sohne · DE

Inventors

Frank Kleefeldt · Heiligenhaus, DE
Lothar Krause · Irving, US

Key dates

Filing date	Nov 30, 1976
Grant date	Jan 23, 1979
Priority date	—
Expiry date	Nov 30, 1996

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T292/1082
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A system for locking the doors of a vehicle by central command includes a reversible motor driving a worm gear. A traveling nut operated by the worm gear engages a lock-actuating lever through an overload clutch. The overload clutch includes a cam and a cam follower. The cam has a normal central stable position bounded on either side by regions of neutral stability which permit override by small manually applied forces in case the motor or worm gear malfunctions. The system further includes a spring powered mechanism for unlocking the doors in the event of an accident. The spring powered mechanism is tripped electrically by an acceleration-sensing switch, and can be recocked by applying a relatively large force to a plunger located on the window sill.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.