Arm pipe for record player tonearms

Details Arm pipe for record player tonearms Arm pipe for record player tonearms

1979-08-03

1981-04-14

Dixon, Jr., William R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

138174, 264 291, 264108, 428 36, G11B 310, B29D 302, D03D 4300

Patent

active

042615801

ABSTRACT:
An arm pipe for a record player tonearm comprises a composite material essentially consisting of a thermoplastic resin and graphite powder. The composite material is prepared by kneading the components, rolled to impart a degree of orientation to the graphite powder particles, which are in the form of flaky graphite and then molded into a pipe, along the surface of which the graphite particles are oriented. Arm pipes wherein the composite material is oxidized at the surface of the pipe and arm pipes wherein the composite material is carbonized or graphitized are also included. A light weight, rigid arm pipe having a high specific modulus of elasticity is obtained through a simple procedure at low cost.

REFERENCES:
patent: 3918722 (1975-11-01), Nakajima et al.
patent: 3923309 (1975-12-01), Nakajima et al.
patent: 3957272 (1976-05-01), Yasuda
patent: 3980105 (1976-09-01), Myskowski
patent: 4086378 (1978-04-01), Kam et al.
patent: 4147364 (1979-04-01), Nakatsuka

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