US3590375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical measuring instruments
Assignee: Crompton Parkinson Ltd
•
Filing: 1969-04-07
•
Granted: 1971-06-29
•
Expires: 1989-04-07
Abstract
Abstract An electrical measuring instrument of the kind in which the rotary moving part is supported at each end by an axially extending tensioned filament and in which the body of the moving part is formed as a moulding of plastics material in which the filament at each end is embedded.
Inventors
- 👤 Frederick A Sills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:15
CPC Classifications
G; G01; G01R; G01R5/00; G01R5/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
In an electrical instrument of the moving coil type having a stator and a rotary moving part supporting the coil and tensioned filament means supporting said moving part at each end, the improvement which comprises: a body for said moving part formed of a moulded plastic material; separate lengths of tensioned filament supporting said moving part at its opposite ends; and at least two inserts moulded in said moving part, one attached to the inner end of each of said filaments respectively.
Claim 2
Dependent Claim
82 words
In an electrical instrument of the moving coil type having a stator and a rotary moving part supporting the coil and tensioned filament means supporting said moving part at each end, the improvement which comprises: a body for said moving part formed of a moulded plastic material; separate lengths of tensioned filament supporting said moving part at its opposite ends; and at least two inserts moulded in said moving part, one attached to the inner end of each of said filaments respectively.
Claim 3
Dependent Claim
31 words
An electrical measuring instrument according to claim 1, and including two paris of inserts, the inner end of each said length of filament being secured between a pair of said inserts.
Claim 4
Dependent Claim
96 words
In an electrical measuring instrument of the kind having a stator, a rotary moving part and an axially extending tensioned filament supporting said moving part at each end within said stator, the improvement which comprises a body for said moving part formed as a moulding of plastic material, said filament being embedded in said moulding at each end, said moving part including at each end a tubular extension surrounding said filament and a pair of bushes on said stator, each said bush surrounding a respective tubular extension whereby to restrict lateral movement of said moving part.
Claim 5
Dependent Claim
96 words
In an electrical measuring instrument of the kind having a stator, a rotary moving part and an axially extending tensioned filament supporting said moving part at each end within said stator, the improvement which comprises a body for said moving part formed as a moulding of plastic material, said filament being embedded in said moulding at each end, said moving part including at each end a tubular extension surrounding said filament and a pair of bushes on said stator, each said bush surrounding a respective tubular extension whereby to restrict lateral movement of said moving part.
Claim 6
Dependent Claim
25 words
An electrical measuring instrument according to claim 3 wherein said tubular extensions are formed as separate mouldings and are mechanically connected to said moving part.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |