Patent US3944922A successfully refreshed from Google Patents.
US3944922A
Expired / Lapsed
US
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Resistivity measuring heads
Assignee: PARC AMBER CO Ltd
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Filing: 1974-10-01
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Granted: 1976-03-16
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Expires: 1994-10-01
Abstract
Abstract A resistivity measuring head comprising a body portion and a replaceable nose portion. The body portion contains a plurality of spring-loaded pins located for axial movement in aligned plain openings in a pair of spaced guide plates, and the nose portion contains a number of probes, one for each pin, each precisely mounted in a pair of precisely aligned jewel bearings. The pins bear against one end of the probes for applying an axial working force thereto. Electrical connections are made to the probes either through the intermediacy of the pins or through a plug and socket arrangement wherein the probes are connected to plug pins carried by the nose piece and adapted for engagement with sockets in the body portion.
Inventors
- 👤 Roger Nicolas Crovo Chambers
- 👤 Peter William Amis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:37
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/14; G01R1/00; G01R1/02; G01R1/06; G01R1/067
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
A resistivity measuring head comprising a body portion and a nose portion attachable to and detachable from the body portion, the nose portion having mounted therein a plurality of relatively-short straight probe tips supported parallel to one another for limited axial movement each by means of a pair of spaced jewel bearings fitted into a bore formed in the nose portion, one end of each probe tip being arranged to project from the nose portion for contacting a specimen the resistivity of which is to be measured, and the body portion having mounted therein, for each probe tip, a relatively long spring loaded pin capable of limited axial movement in the general direction of the axial extent of the probe tips and arranged so that, with the nose portion attached to the body portion, one end of each pin bears upon one end of the respective probe tip so as to apply thereto a spring bias.
Claim 2
Dependent Claim
156 words
A resistivity measuring head comprising a body portion and a nose portion attachable to and detachable from the body portion, the nose portion having mounted therein a plurality of relatively-short straight probe tips supported parallel to one another for limited axial movement each by means of a pair of spaced jewel bearings fitted into a bore formed in the nose portion, one end of each probe tip being arranged to project from the nose portion for contacting a specimen the resistivity of which is to be measured, and the body portion having mounted therein, for each probe tip, a relatively long spring loaded pin capable of limited axial movement in the general direction of the axial extent of the probe tips and arranged so that, with the nose portion attached to the body portion, one end of each pin bears upon one end of the respective probe tip so as to apply thereto a spring bias.
Claim 3
Dependent Claim
43 words
A resistivity measuring head as claimed in claim 1 wherein the pins are so mounted in the body portion as to enable the body portion to be used with different nose portions wherein the probes are differently located with respect to one another.
Claim 4
Dependent Claim
79 words
A resistivity measuring head as claimed in claim 2 wherein the pins are mounted in corresponding apertures formed in a pair of spaced guide plates, and the apertures in the guide plate furthermost from the ends of the pins which bear upon the probe tips are formed to permit a degree of pivotal movement of the pins thereabout whereby to permit the pins to adopt different orientations determined by the relative locations of the apertures in the two plates.
Claim 5
Dependent Claim
36 words
A resistivity measuring head as claimed in claim 1 wherein said probe tips are of the order of 0.2 inches in length as compared with said pins being of the order of 1.0 inch in length.
Claim 6
Dependent Claim
32 words
A resistivity measuring head as claimed in claim 1 wherein said jewel bearings are ruby bearings, the probe tips are formed of tungsten carbide, and the pins are formed of gold-plated steel.
Claim 7
Dependent Claim
41 words
A resistivity measuring head as claimed in claim 1 wherein means are provided in said nose portion for cooperation with complementarily shaped means in the body portion for making electrical connection in a plug and socket fashion with said probe tips.
Claim 8
Dependent Claim
20 words
A nose portion as defined in claim 1 for use with a resistivity measuring head as claimed in claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |