DOOR-LOCKING SYSTEM FOR VEHICLES

• US 3,695,381 A
• Filed: 06/16/1971
• Issued: 10/03/1972
• Est. Priority Date: 07/24/1970
• Status: Expired due to Term

• Current Assignee: Ichita Sogabe, Masashi Okada
• Original Assignee: Ichita Sogabe, Masashi Okada
• Inventors: Okada, Masashi, Sogabe, Ichita
• Primary Examiner(s): Forlenza, Gerald M.
• Assistant Examiner(s): Johnson, R. B.
• Application Number:
  US05/153,779
• Time in Patent Office: 475 Days
• Field of Search: 180/111-113 70/264
• 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 in which energization of a locking cross valve and an unlocking cross valve is extended for a predetermined period of time by utilizing the charging and discharging of a capacitor even after a manual switch is opened, so that the cross valves continue to be energized for a longer period than the time by which the energization of the cross valves and servo systems may be delayed, thereby locking or unlocking the doors in a running vehicle without fail.

Claims

1. A door-locking system for vehicles comprising vehicle speed detector means for generating a digital signal proportional to the vehicle speed;

D-A converter means for converting said digital signal into an analog signal;

amplifier means including a Schmitt circuit whose operating state is reversed when the voltage across the terminals of an integrating capacitor in said D-A converter means reaches a predetermined leVel;

a first relay which energizes a locking electromagnetic means on receipt of a signal generated by the reversal of the operating state of the Schmitt circuit in the amplifier means;

switching means which is manually switched between locking and unlocking sides and, when closed onto the locking side, forms a circuit for charging the integrating capacitor in the D-A converter means;

a second relay which includes a relay coil and a capacitor in parallel therewith and energizes the unlocking electromagnetic means on energization of said relay coil when said switching means is closed onto the unlocking side;

a locking servo system which is driven to lock the doors when the locking electromagnetic means is energized and which includes a holder means for holding the resulting locked state; and

an unlocking servo system which is driven to unlock the doors when the unlocking electromagnetic means is energized and which includes a holder means for holding the resulting unlocked state.