US3891868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically-conducting materials
Assignee: Science Research Council
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Filing: 1974-05-03
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Granted: 1975-06-24
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Expires: 1994-05-03
Abstract
Abstract In an electrostatic generator of the kind in which electrical charges are carried from an electrostatic charging device to a terminal electrode by an endless belt-like charge conveyor, the pulleys for supporting and driving the conveyor are preferably made electroconductive. The improved electrically conducting pulleys have conveyor-engaging surfaces formed by the edge portions of laminations of electrically conducting fibre cloth, such as carbon fibre cloth disposed in the plane of the pulley and integrated into a coherent, yet yieldable body by a cured plastics or rubber material giving good abrasive and substantially dust-free wearing properties.
Inventors
- 👤 Norman George Joyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:52
CPC Classifications
H; H02; H02N; H02N1/00; H02N1/06; H02N1/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
For use in an electrostatic generator of the kind in which an electrode is charged to a high electrical potential by the transfer of electrical charges there to by an endless charge conveyor, an electrically conductive pulley for the charge conveyor, the pulley comprising a metal hub portion and a rim portion, the rim portion having a conveyor-engaging surface at least in part formed by the edges of laminations of sheets of electrically conductive fibres integrated into a coherent body by a cured impregnant.
Claim 2
Dependent Claim
84 words
For use in an electrostatic generator of the kind in which an electrode is charged to a high electrical potential by the transfer of electrical charges there to by an endless charge conveyor, an electrically conductive pulley for the charge conveyor, the pulley comprising a metal hub portion and a rim portion, the rim portion having a conveyor-engaging surface at least in part formed by the edges of laminations of sheets of electrically conductive fibres integrated into a coherent body by a cured impregnant.
Claim 3
Dependent Claim
34 words
For use in an electrostatic generator, an electrically conductive pulley as claimed in claim 1 in which the laminations are composed of carbonaceous fibres integrated into a coherent body by a cured plastics impregnant.
Claim 4
Dependent Claim
64 words
For use in an electrostatic generator, an electrically conductive pulley as claimed in claim 1 in which the rim portion is a composite structure composed of two coherent bodies made of laminations of carbon fibre cloth integrated by a curable impregnant, the laminations lying in planes normal to the pulley axis, the hub portion having a flange to which the coherent bodies are secured.
Claim 5
Dependent Claim
35 words
For use in an electrostatic generator, an electrically conducting pulley as claimed in claim 3, having a rim portion whose outer periphery defInes a V-shaped groove created by co-operating tapered edges to two coherent bodies.
Claim 6
Dependent Claim
51 words
For use in an electrostatic generator, an electrically conductive pulley as claimed in claim 3 in which the two coherent bodies are each flanked by a plate of electrically conductive metal and securing means are provided securing the said plates and the coherent bodies to the flange of the hub portion.
Claim 7
Dependent Claim
35 words
For use in an electrostatic generator an electrically conductive pulley as claimed in claim 1 in which the cured impregnant plastics material is selected from the group Neoprene, polyurethane, butadiene/acrylonitrile copolymer, butyl rubber, natural rubber.
Claim 8
Dependent Claim
113 words
For use in an electrostatic generator, an electrically conductive pulley as claimed in claim 5 in which each coherent body is shaped as an annular block having a central bore to receive said hub portion parallel sides and a peripheral surface oblique to said sides, the hub portion having a peripheral flange centrally disposed and having an outwardly directed face, and annular metal side plates clamping the two bodies to the flange, with said peripheral surfaces oblique to said sides of the bodies co-operating to form the cheeks of a V-shaped groove as friction surfaces for the conveyor the base of which groove being defined by the outwardly directed face of the flange.
Claim 9
Dependent Claim
48 words
For use in an electrostatic generator, an electrically conducting pulley as claimed in claim 1 in which the volumetric ratio of fibrous material to cured impregnant lies between about 80:20 in the body of the fibrous material and about 50:50 in the outer regions of the coherent body.
Claim 10
Dependent Claim
78 words
For use in with an electrical charge conveyor of an electrostatic generator, an electrically conducting pulley having conveyor-engaging surfaces comprised by the edge portions of laminations, the laminations being flexible sheets disposed in the plane of the pulley so lying in planes normal to the pulley axis at least a number of the flexible sheets containing carbonaceous fibres and others being of a filler material, the laminations being integrated into a unitary body by a cured bonding material.
Claim 11
Dependent Claim
78 words
For use in with an electrical charge conveyor of an electrostatic generator, an electrically conducting pulley having conveyor-engaging surfaces comprised by the edge portions of laminations, the laminations being flexible sheets disposed in the plane of the pulley so lying in planes normal to the pulley axis at least a number of the flexible sheets containing carbonaceous fibres and others being of a filler material, the laminations being integrated into a unitary body by a cured bonding material.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |