# US 5,335,130 A · Cassette with recording medium

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- Number: US 5,335,130 A
- Document ID: US5335130A
- Status: Granted
- Kind: A
- Application number: 08/010,056
- Filed: 1993-01-28
- Granted: 1994-08-02
- Earliest claimed: 1992-01-29
- Assignees: BASF SE
- Inventors: Klaus Schoettle
- Web page: https://patentgrep.com/patent/US5335130A

## CPC

- G11B 23/08735: {Covers}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A cassette having a movable closure member for housing openings and a spring in a housing recess between housing and closure member is designed with a spring having an effective thickness with respect to the housing recess receiving the spring, such that the closure member is kept at a predetermined constant distance from the housing surface.

## Claims

### Claim 1

In a magnetic recording cassette having a housing with openings therein for the entry of drive members and for the access of scanning members to the recording medium, said housing having a movable closure member biased by a spring element for closing and exposing said openings, said spring element having an effective thickness and being housed in a recess on the housing between said housing and said movable closure member, said recess having a certain depth, the improvement comprising: the effective thickness of said spring element being greater than the certain depth of said recess, for preventing the closure member from scraping against the cassette housing.

### Claim 2 (depends on 1)

A magnetic recording cassette as claimed in claim 1, wherein the spring consists of round steel wire.

### Claim 3 (depends on 1)

A magnetic recording cassette as claimed in claim 1, wherein the spring consists of a steel wire having a thickness and having a permanent deformation along its length perpendicular to its horizontal extent, said deformation increasing the effective thickness of the spring beyond the thickness of the steel wire.

### Claim 4 (depends on 1)

A magnetic recording cassette as defined in claim 1, wherein the spring element includes areas of vertical deformation along its length perpendicular to its horizontal extent, thereby increasing the effective thickness of the spring element.

### Claim 5 (depends on 4)

A magnetic recording cassette as claimed in claim 4, where the spring, viewed from the side when in place on the cassette housing lying flat, follows a sine wave pattern or square wave pattern or similar pattern of permanent vertical deformation, thereby increasing its effective thickness.

### Claim 6 (depends on 1)

A magnetic recording cassette as defined in claim 1, wherein the spring element is "U" shaped.

### Claim 7 (depends on 1)

A magnetic recording cassette as claimed in claim 1, wherein the spring has a a wave-shape deformation perpendicular to its horizontal extent.