# US 4,398,750 A · Emergency release mechanism for passive seat belt systems

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- Number: US 4,398,750 A
- Document ID: US4398750A
- Status: Granted
- Kind: A
- Application number: 06/313,006
- Filed: 1981-10-19
- Granted: 1983-08-16
- Earliest claimed: 1981-10-19
- Assignees: Allied Corporation
- Inventors: Rudy V. Thomas
- Web page: https://patentgrep.com/patent/US4398750A

## CPC

- B60R 22/32: Devices for releasing in an emergency, e.g. after an accident {; Remote or automatic unbuckling devices (unlocking devices for retractors B60R22/3416)}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

An emergency release mechanism for passive seat belt systems including a housing retained in the window frame of a vehicle door, a pivotable lever in the housing about which a loop of seat belt webbing is placed, a latch normally holding the lever in its lock position and a release member for movement of the latch out of engagement with the lever in order to release the belt.

## Claims

### Claim 1

In a passive seat belt system including a seat belt adapted to automatically be positioned about an occupant in a seat in a vehicle, said seat being located adjacent to a door of said vehicle, said seat belt normally attached to said door, and an emergency release means for releasing said seat belt from said door to permit egress of the occupant from said vehicle in an emergency situation, the improvement comprising:
said emergency release means comprising:
a housing mounted on said door;
a retaining lever pivotally mounted in said housing and adapted to communicate with said seat belt, said lever being movable from a first position at which it retains said seat belt in its operative mode to permit automatic positioning about said occupant to a second position at which it releases said seat belt;
latch means in said housing located at a first position at which it holds said lever in its first position, said latch means being movable in said housing to a second position at which it no longer holds a lever in its first position;
means automatically moving said lever from its first position to its second position upon movement of said latch means to its second position; and
actuator means supported in said housing and in contact with said latch means, said actuator means being movable from a first lock position to a second release position, movement of said actuator means from its first to second positions resulting in movement of said latch means from its first to second positions, whereby said lever is moved to its second position to release said seat belt.

### Claim 2 (depends on 1)

The passive seat belt system of claim 1 including a window frame on said door, said frame including a post, said housing being recessed in said post.

### Claim 3 (depends on 1)

The passive seat belt system of claim 1 including a loop at one end of said seat belt, said loop extending over said retaining lever.

### Claim 4 (depends on 1)

The passive seat belt system of claim 1 wherein said actuating means comprises a pivotable lever.

### Claim 5 (depends on 1)

The passive seat belt system of claim 1 wherein said means automatically moving said lever from its first to its second positions comprises a spring.

### Claim 6 (depends on 1)

The passive seat belt system of claim 1 including inclined slots in said housing, said latch means including a single latch retained in said slots.

### Claim 7 (depends on 6)

The passive seat belt system of claim 6 including a spring in said housing biasing said latch downwardly in said slots.

### Claim 8 (depends on 7)

The passive seat belt system of claim 7 including a distal end of said lever, said latch normally bearing against said distal end to retain said lever in its first position.

### Claim 9 (depends on 1)

The passive seat belt system of claim 1 including a seat belt retractor mounted on the inboard side of said seat, said seat belt being wound up on said retractor.

### Claim 10 (depends on 2)

The passive seat belt system of claim 2 wherein said actuator means comprises a pivotable lever mounted in said housing, said pivotable lever having a distal end portion adapted for manual actuation, and wherein the only portion of said emergency release means that extends inwardly from said post is said distal end portion of said lever.