VEHICLE DOOR LOCKING SYSTEM

• US 3,722,615 A
• Filed: 07/19/1971
• Issued: 03/27/1973
• Est. Priority Date: 09/02/1970
• Status: Expired due to Term

• Current Assignee: Hisami Mitsueda, Masashi Okada, Yoshichi Kawashima
• Original Assignee: Hisami Mitsueda, Masashi Okada, Yoshichi Kawashima
• Inventors: Kawashima, Yoshichi, Okada, Masashi, Mitsueda, Hisami
• Primary Examiner(s): Betts, Kenneth H.
• Application Number:
  US05/163,837
• Time in Patent Office: 617 Days
• Field of Search: 180/107,114,112,113,111,82,15E 70/264 317/5,148.5
• US Class Current: 180/281
• CPC Class Codes: E05B 77/54 Automatic securing or unlocking of bolts triggered by certain vehicle parameters, e.g. exceeding a speed threshold triggered by vehicle collision E05B77/12
• CPC Class Codes: Y10T 70/65 Central control

Abstract

A system for locking vehicle doors wherein the doors of a vehicle, especially, an automobile are locked or unlocked by the operation of a manual switch in order to prevent theft, for example, and in addition they are automatically locked when the vehicle speed reaches a predetermined level, thereby securing the safety of passengers.

Claims

1. A vehicle door locking system comprising a locking electromagnetic valve, a servo system energized upon energization of said locking electromagnetic valve thereby to lock vehicle doors, a holding means for maintaining said vehicle doors locked even after said locking electromagnetic valve is de-energized, and an unlocking electromagnetic valve for energizing said servo system or another servo system thereby to release said vehicle doors from said locked state;

said locking system further comprising two capacitors whose charging paths are opened and closed by closing and opening a manual switch respectively, a locking transistor with one of said capacitors operatively connected between the base and the emitter thereof to control current to said locking electromagnetic valve, an unlocking transistor with the other of said capacitors operatively connected between the base and the emitter thereof in order to control current to said unlocking electromagnetic valve, a discharging circuit for discharging said two capacitors each through a resistor and the base and the emitter of a corresponding one of said locking and unlocking transistors, an automatic locking circuit for energizing said locking transistor when the vehicle speed reaches a predetermined level, an exclusive circuit for cutting off said unlocking transistor when said locking transistor is in a conductive state, and a protective circuit for cutting off said locking and unlocking transistors by detecting an abnormal voltage between the collector and the emitter of said locking and unlocking transistors.