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 Title: |
US3873783:
UNIVERSAL STYLUS ARM PIVOT COUPLING
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Leedom, Marvin Allan; Princeton, NJ
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| Assignee: |
RCA Corporation, New York, NY
other patents from RCA CORPORATION (466175) (approx. 7,929)
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| Published / Filed: |
1975-03-25
/ 1974-03-28
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| Application Number: |
US1974000455832
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| IPC Code: |
Advanced:
G11B 9/00;
Core:
more...
IPC-7:
G11B 3/00;
G11B 3/20;
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| U.S. Class: |
Current:
369/126;
369/244.1;
Original:
179/100.4R;
178/006.6A;
274/023.R;
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| Field of Search: |
179/100.4 R,100.1 B
274/23 A,23 R,28
178/6.6 A
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| Priority Number: |
| 1974-03-28 |
US1974000455832 |
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| Abstract: |
In a video disc playback system including a motorboard, a turntable, an information disc, a stylus, a stylus arm, and a stylus arm carrying structure, a universal stylus arm pivot coupling is provided for coupling the stylus arm to the carrying structure. The coupling comprises a generally horseshoe-shaped stylus arm holder affixed to the stylus arm. A plug, having a tapered end with a substantially circular cross-section, is fastened to the first leg of the arm holder. A support member, also generally horseshoe-shaped, is attached to the carrying structure. An opening, having dimensions permitting only a partial entry of and presenting complementary bearing surfaces for smooth engagement with the plug, is disposed in the first leg of the support member. A spring is connected between the second legs of, respectively, the arm holder and the support member. The spring member persistently urges the plug into the opening and provides tracking pressure between the stylus and the disc during playback.
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| Attorney, Agent or Firm: |
Whitacre, Eugene M. ;
Meagher, William H. ;
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| Primary / Asst. Examiners: |
Fears, Terrell W.; Levy, Stewart
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| Family: |
None
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First Claim:
Show all 4 claims |
What is claimed is:
1. In a playback system including a board, a turntable mounted for rotation relative to said board, said turntable having a surface adapted to receive a disc, said disc including a spiral groove with information recorded therein, a stylus arm, a stylus subject to positioning in said spiral groove for recovering said information, said stylus being affixed to a free end of said stylus arm, and a stylus arm carrying structure linked to said board; a universal stylus arm pivot coupling, comprising:
- a generally horseshoe-shaped stylus arm holder affixed to the end of said stylus arm remote from said free end;
- a plug having a tapered end with substantially circular cross-section, said plug being fastened to a first leg of said stylus arm holder;
- a generally horseshoe-shaped support member attached to said stylus arm carrying structure, an opening being disposed in a first leg of said support member and having dimensions permitting only a partial entry of and presenting complementary bearing surfaces for smooth engagement with said plug; and
- a spring member coupled between the second legs of said stylus arm holder and said support member, said spring member during operation of said coupling continuously urging said plug into said opening and further tending to align the axis of said plug with the axis of said spring member thereby tending to minimize the strain in said spring member.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
Show description
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| Forward References: |
Show 7 U.S. patent(s) that reference this one
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