US3645541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickup arms
Assignee: Individual
•
Filing: 1969-03-17
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Granted: 1972-02-29
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Expires: 1989-03-17
Abstract
Abstract This invention relates to an improved phonograph pickup arm assembly affording a wide range of adjustments. In particular, the arm includes means for adjusting playing weight in which variation of playing weight is accompanied by automatic adjustment of a force correcting the side thrust of skating force at the stylus. The correcting force is produced by inclination of the pivotal axis of the arm by an angular amount about which produces an appropriate horizontally resolved part of the vertical force of the stylus. The pickup arm can be unplugged towards its inward end.
Inventors
- 👤 Alastair John Roberts Steyning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:36
CPC Classifications
G; G11; G11B; G11B3/00; G11B3/02; G11B3/10; G11B3/12; G11B3/14; G11B3/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
203 words
A pickup arm assembly for reproducing sound from a disk type phonograph record supported by a rotatably driven generally horizontal turntable, comprising a. a pillar head assembly (20) adapted for arrangement adjacent said turntable; b. pickup arm means (30) for supporting at one end a pickup cartridge (54) having a stylus (64); c. means connecting said pickup arm means with said pillar head assembly for vertical and horizontal pivotal movement, said connecting means including 1. intermediate support means (22, 26) pivotally connected with said pillar head assembly for movement about a first generally horizontal pivot axis, and 2. means (32, 33) connecting said pickup arm means with said intermediate support means for movement about a second pivot axis that is inclined to the vertical by an acute angle ( Beta ): d. counterbalance means (41, 46) balancing said pickup arm means to a counterbalanced condition relative to said generally horizontal pivot axis; and e. biasing means (60, 61, 62) for rotating said intermediate support member about its axis to impose on the stylus a selected downwardly directed playing force that is automatically accompanied by a corresponding horizontally directed antiskating side thrust component which is a function of saId acute angle ( Beta ).
Claim 2
Dependent Claim
203 words
A pickup arm assembly for reproducing sound from a disk type phonograph record supported by a rotatably driven generally horizontal turntable, comprising a. a pillar head assembly (20) adapted for arrangement adjacent said turntable; b. pickup arm means (30) for supporting at one end a pickup cartridge (54) having a stylus (64); c. means connecting said pickup arm means with said pillar head assembly for vertical and horizontal pivotal movement, said connecting means including 1. intermediate support means (22, 26) pivotally connected with said pillar head assembly for movement about a first generally horizontal pivot axis, and 2. means (32, 33) connecting said pickup arm means with said intermediate support means for movement about a second pivot axis that is inclined to the vertical by an acute angle ( Beta ): d. counterbalance means (41, 46) balancing said pickup arm means to a counterbalanced condition relative to said generally horizontal pivot axis; and e. biasing means (60, 61, 62) for rotating said intermediate support member about its axis to impose on the stylus a selected downwardly directed playing force that is automatically accompanied by a corresponding horizontally directed antiskating side thrust component which is a function of saId acute angle ( Beta ).
Claim 3
Dependent Claim
105 words
means (32, 33) connecting said pickup arm means with said intermediate support means for movement about a second pivot axis that is inclined to the vertical by an acute angle ( Beta ): d. counterbalance means (41, 46) balancing said pickup arm means to a counterbalanced condition relative to said generally horizontal pivot axis; and e. biasing means (60, 61, 62) for rotating said intermediate support member about its axis to impose on the stylus a selected downwardly directed playing force that is automatically accompanied by a corresponding horizontally directed antiskating side thrust component which is a function of saId acute angle ( Beta ).
Claim 4
Dependent Claim
105 words
means (32, 33) connecting said pickup arm means with said intermediate support means for movement about a second pivot axis that is inclined to the vertical by an acute angle ( Beta ): d. counterbalance means (41, 46) balancing said pickup arm means to a counterbalanced condition relative to said generally horizontal pivot axis; and e. biasing means (60, 61, 62) for rotating said intermediate support member about its axis to impose on the stylus a selected downwardly directed playing force that is automatically accompanied by a corresponding horizontally directed antiskating side thrust component which is a function of saId acute angle ( Beta ).
Claim 5
Dependent Claim
31 words
Apparatus as defined in claim 1, wherein the first pivot axis is inclined to the horizontal by an acute angle ( Alpha ) equal to said acute angle ( Beta ).
Claim 6
Dependent Claim
67 words
Apparatus as defined in claim 1, and further including third pivot means (66) connecting said intermediate support means with said pillar head assembly for pivotal adjustment about a horizontal adjustment axis normal to the vertical plane containing said first pivot axis, and adjustment means (69a) for pivoting said intermediate support means about said horizontal adjustment axis to vary the angle of inclination of said first pivot axis.
Claim 7
Dependent Claim
23 words
Apparatus as defined in claim 1, wherein said biasing means includes weight means (61, 62) radially adjustable relative to said intermediate support means.
Claim 8
Dependent Claim
34 words
Apparatus as defined in claim 1, and further including a base plate (10); and shaft means (12) connecting said pillar head assembly to said base plate for vertical movement relative to said base plate.
Claim 9
Dependent Claim
29 words
Apparatus as defined in claim 5, and further including means (78) or adjusting the height of said pillar head assembly and said shaft means relative to said base plate.
Claim 10
Dependent Claim
31 words
Apparatus as defined in claim 5, and further including means including a sliding bush (11) for horizontally adjusting said shaft means and said pillar head assembly relative to said base plate.
Claim 11
Dependent Claim
36 words
Apparatus as defined in claim 1, and further including means for adjusting the lateral balance of said pickup arm means, comprising an eccentrically weighted member (48) connected for coaxial rotation relative to said pickup arm means.
Claim 12
Dependent Claim
23 words
Apparatus as defined in claim 8, wherein said counterbalance means is threadably connected with said pickup arm means for axial adjustment relative thereto.
Claim 13
Dependent Claim
14 words
Apparatus as defined in claim 9, wherein said counterbalance means includes separable sections (42).
Claim 14
Dependent Claim
28 words
Apparatus as defined in claim 9, wherein said lateral balance weight means (48) is connected for axial displacement of said pickup arm means simultaneously with said counterbalance means.
Claim 15
Dependent Claim
31 words
Apparatus as defined in claim 11, and further including means preventing rotational movement of said lateral balance weight means relative to said pickup arm means upon rotation of said counterbalance means.
Claim 16
Dependent Claim
44 words
Apparatus as defined in claim 1 wherein said pickup arm means includes pickup head means 54 for supporting a stylus, said pickup head means including detachable electrical and mechanical coupling (52, 53) for the removal of said pickup head means from said arm means.
Claim 17
Dependent Claim
40 words
Apparatus as defined in claim 13, wherein said couplings are arranged within the length of the arm, so that upon removal of the pickup head means, at least a part of the length of said arm means is removed therewith.
Claim 18
Dependent Claim
30 words
Apparatus as defined in claim 14, wherein said couplings are arranged in the inner half of the length of said arm means between the stylus and the arm pivot means.
Claim 19
Dependent Claim
37 words
Apparatus as defined in claim 1, wherein said pickup arm means is cranked, the portion of the arm means near the pillar head assembly being lower in use than the stylus-supporting end portion of said arm means.
Claim 20
Dependent Claim
43 words
Apparatus as defined in claim 1, including a base plate (10) attached to said pillar head assembly; a fixed base support member (13); and locating and retaining means (14, 15) for locating and retaining said base plate relative to said base support member.
Claim 21
Dependent Claim
21 words
Apparatus as defined in claim 17, wherein said locating and retaining means includes pegs and cooperating sockets on the respective parts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |