# US 4,392,277 A · Lock tongue for safety belts

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- Number: US 4,392,277 A
- Document ID: US4392277A
- Status: Granted
- Kind: A
- Application number: 06/271,360
- Filed: 1981-06-08
- Granted: 1983-07-12
- Earliest claimed: 1980-06-06
- Assignees: Daimler-Benz Aktiengesellschaft
- Inventors: Manfred Muller
- Web page: https://patentgrep.com/patent/US4392277A

## CPC

- A44B 11/2557: {with strap length adjustment}
- A44B 11/02: frictionally engaging surface of straps
- Y10T 24/4084: Looped strap
- A44B: BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE (fastenings specially adapted for footwear A43C)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A lock tongue for safety belts with a belt strap of the safety belt being adapted to pass through the lock tongue and be firmly attached to the belt strap so as to be safe against displacement at a certain location of the belt strap due to a loop-around friction occuring under load. The attachment is effected by repeated deflection of the belt strap by means of a component separate from the lock tab or tongue cooperating with the later. The lock tab or tongue includes two passage openings which are separated from each other by a central web, with the passage openings being adapted to accommodate the belt strap. A clamping bracket may be attached, preferably in a releasable fashion, into one of the passage openings. The clamping bracket bridges the passage opening and extends along an entire longitudinal extension of the passage opening and rests on both sides in marginal zones of the lock tab or tongue adjoining the narrow sides of the passage opening, wherein the clamping bracket serves for supporting the belt strap extended therearound.

## Claims

### Claim 1

A lock tongue for a safety belt system, comprising two passage openings for accommodating a belt strap of the safety belt system, a central web means for separating the two passage openings, and clamping means adapted to be attached in one of the passage openings for clamping the belt strap, the clamping means extending along an entire longitudinal extension of the passage opening so as to rest on both sides in marginal zones of the lock tongue adjoining narrow sides of the passage opening so that the clamping means supports the belt strap extended therearound when the clamping means is in the passage opening, the belt strap passes through the passage openings so that the lock tongue is firmly attachable in a certain location of the belt strap due to a loop around friction occurring under load, the attachment of the lock tongue is effected by repeated deflection of the belt strap by the clamping means, the clamping means includes a clamping bracket having a base portion and a head portion, the head portion has a width wider than a width of the base portion such that the bracket has an approximately mushroom-shaped cross section, the base portion is adapted to be inserted into the passage opening, the width of the base portion is less than the length of the narrow sides of the passage opening by about three times a thickness of the belt strap, a width of the head portion corresponds approximately to the length of the narrow sides of the passage opening, and means are provided for attaching the clamping bracket to the lock tongue.

### Claim 2 (depends on 1)

The lock tongue according to claim 1, wherein the attaching means includes a hook portion arranged on the clamping bracket.

### Claim 3 (depends on 2)

The lock tongue according to claim 2, wherein the hook portion is fashioned of an elastic material and is articulated to the clamping bracket.

### Claim 4 (depends on 1)

The lock tongue according to claim 1, wherein the clamping means includes a clamping bracket, and means are provided for attaching the clamping bracket to the lock tongue.

### Claim 5 (depends on 4)

The lock tongue according to claim 4, wherein the attaching means includes a hook portion arranged on the clamping bracket.

### Claim 6 (depends on 5)

The lock tongue according to claim 5, wherein the hook portion is fashioned of an elastic material and is articulated to the clamping bracket.