# US 4,393,487 A · Stylus cartridge

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- Number: US 4,393,487 A
- Document ID: US4393487A
- Status: Granted
- Kind: A
- Application number: 06/328,550
- Filed: 1981-12-07
- Granted: 1983-07-12
- Earliest claimed: 1981-12-07
- Assignees: RCA Corporation
- Inventors: Paul J. Straub, Jr.
- Web page: https://patentgrep.com/patent/US4393487A

## CPC

- G11B 21/16: Supporting the heads; Supporting the sockets for plug-in heads
- 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 stylus cartridge is equipped with a pair of integrally-molded flexural retaining fingers for locking a stylus arm within the confines of the cartridge body. When a slider member disposed on the cartridge is acted upon, it spreads the retaining fingers apart to release the stylus arm.

## Claims

### Claim 1

A stylus cartridge comprising:
(A) a stylus;
(B) a stylus arm having said stylus disposed at one end thereof;
(C) a cartridge housing; said carriage housing being provided with a pair of guide rails;
(D) means for flexibly supporting the other end of said stylus arm in said cartridge housing;
(E) a retaining finger disposed in said cartridge for supporting said stylus arm in a raised position within the confines of said cartridge housing; and
(F) an actuating member slidably-mounted on said cartridge rails; said actuating member deflecting said retaining finger to release said stylus arm.

### Claim 2 (depends on 1)

The cartridge as defined in claim 1 having a pair of oppositely-disposed flexural retaining fingers; said retaining fingers supporting said stylus arm in a raised position within the confines of said cartridge housing; said actuating member serving to spread said retaining fingers apart to free said stylus arm when said actuating member is acted upon.

### Claim 3 (depends on 2)

The cartridge as defined in claim 2 wherein said flexural retaining fingers are integrally molded with said cartridge housing.

### Claim 4 (depends on 3)

The cartridge as defined in claim 3 wherein each of said retaining fingers is equipped with a depending portion; each of said depending portions being provided with a slanting surface; said slanting surfaces centering said stylus arm within said cartridge.

### Claim 5

A stylus cartridge comprising:
(A) a stylus;
(B) a stylus arm having said stylus disposed at one end thereof;
(C) a cartridge housing; said cartridge housing being provided with a pair of guide rails;
(D) means for flexibly supporting the other end of said stylus arm in said cartridge housing;
(E) a pair of oppositely-disposed, integrally-molded flexural retaining fingers for supporting said stylus arm in a raised position within the confines of said cartridge housing; each of said retaining fingers being equipped with a depending portion having a slanting surface; said slanting surfaces serving to center said stylus arm within said cartridge housing; and
(F) an actuating member slidably mounted on said cartridge guide rails; said actuating member being equipped with a wedge-shaped portion which engages said retaining fingers to spread them apart when said actuating member is advanced.

### Claim 6 (depends on 5)

The cartridge as defined in claim 5 wherein said stylus arm is provided with an extension at said other end thereof which engages said actuating member when it is retracted to return said stylus arm to the confines of said cartridge housing.

### Claim 7 (depends on 6)

The cartridge as defined in claim 6 wherein said stylus arm is fitted with a weight to provide a desired stylus tracking force.

### Claim 8 (depends on 7)

The cartridge as defined in claim 7 for use with a record player having a stylus arm lifting/lowering mechanism; said actuating member being dimensioned such that when said actuating member is advanced to free said stylus arm, said extension of said stylus arm near said other end thereof is exposed through an opening in said cartridge housing for action by said stylus arm lifting/lowering mechanism.

### Claim 9 (depends on 8)

The cartridge as defined in claim 8 for use with said player further having a slidably-mounted cradle; said cradle having a pair of guides for removably receiving said cartridge; said cartridge having a cutout in which the free end of a cradle-mounted latch spring is received for locking said cartridge in place when said actuating member is fully advanced; retraction of said actuating member defeating said latch spring to unlock said cartridge.

### Claim 10 (depends on 9)

The cartridge as defined in claim 9 wherein the configuration of said actuating member is such that it obstructs entry of said latch spring into said cutout until said actuating member is fully advanced.