US3895291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating or measuring instruments
Assignee: Taylor Electrical Instruments Ltd
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Filing: 1974-02-19
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Granted: 1975-07-15
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Expires: 1994-02-19
Abstract
Abstract A multi-range electrical measuring or indicating instrument including a current sensitive movement adapted to provide an indication of an electrical signal. The movement is connected to contacts which make electrical connection with contact members on a printed circuit member. The printed circuit member includes circuit apparatus for controlling the sensitivity of the instrument, and is movable relative to the contacts to selectively connect the circuit apparatus to the movement.
Inventors
- 👤 Terence Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:13
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/002; G01R15/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
305 words
A multi-range electrical measuring instrument, comprising a. a base; b. an electrical measuring instrument mounted on said base; c. a movable cylindrical ceramic support body rotatably connected with said base for movement between a plurality of different range-establishing positions; d. printed circuit means mounted on said support body, portions of said printed circuit means containing at least one electrical component, respectively, said printed circuit portions having different impedance values; e. means responsive to the position of said support member relative to said base for selectively connecting said printed circuit portions with said measuring instrument to establish different operating ranges thereof, respectively, said connecting means including 1. stationary contact means mounted on said base member and electrically connected with said measuring means, said stationary contact means including a plurality of electrically conductive elongate spring members mounted on said base; and 2. a plurality of movable contact means mounted on said movable support body and electrically connected with said printed circuit portions, respectively, said movable contact means being arranged for selective engagement with said stationary contact means in accordance with the instantaneous position of said movable support relative to the base; f. input terminal means for connecting some of said elongate spring members with a voltage source; g. means for displacing said support body between said rangeestablishing positions relative to said base; and h. varible resistor means connected with said ceramic support body for providing resistance measurements by said instrument, said variable resistor means including 1. a pair of parallel spaced annular tracks printed on said support body, one of said tracks being formed of resistive material and the other of said tracks being formed of a conductive material; and 2. electrically conductive bridge means connected for movement relative to said base and to said support member, said bridge means being in electrical contact with said tracks.
Claim 2
Dependent Claim
305 words
A multi-range electrical measuring instrument, comprising a. a base; b. an electrical measuring instrument mounted on said base; c. a movable cylindrical ceramic support body rotatably connected with said base for movement between a plurality of different range-establishing positions; d. printed circuit means mounted on said support body, portions of said printed circuit means containing at least one electrical component, respectively, said printed circuit portions having different impedance values; e. means responsive to the position of said support member relative to said base for selectively connecting said printed circuit portions with said measuring instrument to establish different operating ranges thereof, respectively, said connecting means including 1. stationary contact means mounted on said base member and electrically connected with said measuring means, said stationary contact means including a plurality of electrically conductive elongate spring members mounted on said base; and 2. a plurality of movable contact means mounted on said movable support body and electrically connected with said printed circuit portions, respectively, said movable contact means being arranged for selective engagement with said stationary contact means in accordance with the instantaneous position of said movable support relative to the base; f. input terminal means for connecting some of said elongate spring members with a voltage source; g. means for displacing said support body between said rangeestablishing positions relative to said base; and h. varible resistor means connected with said ceramic support body for providing resistance measurements by said instrument, said variable resistor means including 1. a pair of parallel spaced annular tracks printed on said support body, one of said tracks being formed of resistive material and the other of said tracks being formed of a conductive material; and 2. electrically conductive bridge means connected for movement relative to said base and to said support member, said bridge means being in electrical contact with said tracks.
Claim 3
Dependent Claim
26 words
electrically conductive bridge means connected for movement relative to said base and to said support member, said bridge means being in electrical contact with said tracks.
Claim 4
Dependent Claim
26 words
electrically conductive bridge means connected for movement relative to said base and to said support member, said bridge means being in electrical contact with said tracks.
Claim 5
Dependent Claim
53 words
A multi-range electrical measuring instrument, as claimed in claim 1, said instrument further comprising a plurality of range scales on said support member, a housing and a viewing window in said housing, and wherein movement of said support member is effective to display the scale of a selected range scale in said window.
Claim 6
Dependent Claim
103 words
a plurality of movable contact means mounted on said movable support body and electrically connected with said printed circuit portions, respectively, said movable contact means being arranged for selective engagement with said stationary contact means in accordance with the instantaneous position of said movable support relative to the base; f. input terminal means for connecting some of said elongate spring members with a voltage source; g. means for displacing said support body between said range-establishing positions relative to said base; and h. varible resistor means connected with said ceramic support body for providing resistance measurements by said instrument, said variable resistor means including
Claim 7
Dependent Claim
103 words
a plurality of movable contact means mounted on said movable support body and electrically connected with said printed circuit portions, respectively, said movable contact means being arranged for selective engagement with said stationary contact means in accordance with the instantaneous position of said movable support relative to the base; f. input terminal means for connecting some of said elongate spring members with a voltage source; g. means for displacing said support body between said range-establishing positions relative to said base; and h. varible resistor means connected with said ceramic support body for providing resistance measurements by said instrument, said variable resistor means including
Claim 8
Dependent Claim
29 words
A multi-range electrical measuring instrument, as claimed in claim 1, wherein said body is formed as an aligned assembly of shorter cylinders, of which a plurality bear printed circuits.
Claim 9
Dependent Claim
42 words
Apparatus as defined in claim 1, and further including means for displacing said bridge means relative to said tracks, said displacing means including a ring member arranged concentrically about said ceramic support body, said bridge means being coNnected with said ring member.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |