US3940198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral multifinger contact and method of making
Assignee: Illinois Tool Works Inc
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Filing: 1975-03-20
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Granted: 1976-02-24
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Expires: 1995-03-20
Abstract
Abstract An integral multifinger contact with each finger being capable of flexing independently of one another while maximizing the number of independent finger contacts along a given contact line. The method involves the shearing of finger portions and elongating these portions during the shearing operation to provide a positive clearance between adjacent edges of the fingers. One embodiment of the invention being directed to a contact member particularly adapted for a rotary potentiometer while another embodiment has particular use in a linear potentiometer.
Inventors
- 👤 Stephen Verner Andersen
- 👤 Edwin Grant Swick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:11
CPC Classifications
H; H01; H01C; H01C1/00; H01C1/12; H01H; H01H11/00; H01H11/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A one piece electrical wiper brush contact including a base portion adapted for attachment to a carrier, a plurality of slender, resilient, arc-like contact fingers, each extremity thereof integrally joined to the base, said contact fingers merging together at both regions of juncture with the base, the side edges of adjacent arc-like fingers being separated over substantially their entire length by a crescent shaped aperture, dimpled localized contact regions being formed in the fingers and substantially radially aligned thereon.
Claim 2
Dependent Claim
79 words
A one piece electrical wiper brush contact including a base portion adapted for attachment to a carrier, a plurality of slender, resilient, arc-like contact fingers, each extremity thereof integrally joined to the base, said contact fingers merging together at both regions of juncture with the base, the side edges of adjacent arc-like fingers being separated over substantially their entire length by a crescent shaped aperture, dimpled localized contact regions being formed in the fingers and substantially radially aligned thereon.
Claim 3
Dependent Claim
35 words
A one piece wiper brush contact as in claim 1, wherein the localized contact regions are located substantially midway the extremities of the fingers and in the area of maximum spacing between adjacent arc-like fingers.
Claim 4
Dependent Claim
35 words
An electrical contact brush as in claim 1, wherein each contact finger includes a necked down portion of a width less than the width of the fingers at the region of merger with the base.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |