US3569901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal-mating bimetal rollpins
Assignee: Globe Motors Inc
•
Filing: 1968-10-25
•
Granted: 1971-03-09
•
Expires: 1988-10-25
Abstract
Abstract There is disclosed a set of two mutually supporting metallic elements which, when mated, form a combined structure with assured holding force sufficient to maintain good mechanical and electrical connection over a substantial temperature excursion both above and below room temperature. Each of the metallic elements consists of a fabricated bimetal rollpin which is cylindrical in shape with an incomplete circular cross section so that a pair of elements may be inserted one within the other to establish mechanical and electrical contact. Each of the elements consists of two metallic layers. The metal comprising the outer layer on one element comprises the inner layer on the other element and the metal comprising the inner layer on the first element comprises the outer layer on the second element. In this manner the two rollpins are provided with opposite or complementary thermal expansion and contraction characteristics so that the connection once made remains firm and tight independently of excursions of ambient temperature.
Inventors
- 👤 John A Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:45
CPC Classifications
H; H01; H01R; H01R4/00; H01R4/10; H01R4/18; Y; Y10; Y10S; Y10S24/00; Y10S24/30; Y10S24/38; Y10S24/39; Y10S411/00; Y10S411/02; Y10S411/909; Y10T; Y10T24/00; Y10T24/44; Y10T24/45; Y10T24/45152; Y10T24/45225; Y10T24/45461
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A set of two mutually supporting metallic elements which combine to form a structure with assured holding force sufficient to maintain good mechanical and electrical connection over a wide temperature range comprising: a. a pair of complementary bimetal rollpin elements, each of said rollpins being cylindrical in shape with an incomplete circular cross section so that said pair of elements may be fitted into each other to have an interference fit at room temperature; b. each of said rollpins having an inner and outer metallic layer to provide temperature responsive changes in the cross section of said rollpins; and c. the metals of a first of said elements being such as to produce expansion of the cross section of said element when it is heated and the metals of the other of said elements being such as to produce expansion of the cross section of said other element when it is cooled.
Claim 2
Dependent Claim
152 words
A set of two mutually supporting metallic elements which combine to form a structure with assured holding force sufficient to maintain good mechanical and electrical connection over a wide temperature range comprising: a. a pair of complementary bimetal rollpin elements, each of said rollpins being cylindrical in shape with an incomplete circular cross section so that said pair of elements may be fitted into each other to have an interference fit at room temperature; b. each of said rollpins having an inner and outer metallic layer to provide temperature responsive changes in the cross section of said rollpins; and c. the metals of a first of said elements being such as to produce expansion of the cross section of said element when it is heated and the metals of the other of said elements being such as to produce expansion of the cross section of said other element when it is cooled.
Claim 3
Dependent Claim
69 words
Apparatus as in claim 1 wherein each of said rollpins is formed from the same two metals with the particular metals being oppositely disposed so that the inner layer of the first element and the outer layer of the second element are formed of a first metal whereas the outer layer of the first element and the inner layer of the second element are formed of a second metal.
Claim 4
Dependent Claim
17 words
Apparatus as in claim 2 wherein said first metal is aluminum and said second metal is copper.
Claim 5
Dependent Claim
94 words
Electrical contact means comprising: a. first and second thermal bimetal rollpins; b. each of said rollpins having a cylindrical configuration with an incomplete circular cross section resulting from a slit formed along the side of the rollpin; c. said rollpins being shaped and dimensioned to be spring biased into electrical contact by an interference fit when interlocked through the slits at a predetermined normal temperature; and d. said rollpins having opposite thermal expansion characteristics so as to maintain electrical and mechanical contact over a temperature excursion both above and below said predetermined normal temperature.
Claim 6
Dependent Claim
94 words
Electrical contact means comprising: a. first and second thermal bimetal rollpins; b. each of said rollpins having a cylindrical configuration with an incomplete circular cross section resulting from a slit formed along the side of the rollpin; c. said rollpins being shaped and dimensioned to be spring biased into electrical contact by an interference fit when interlocked through the slits at a predetermined normal temperature; and d. said rollpins having opposite thermal expansion characteristics so as to maintain electrical and mechanical contact over a temperature excursion both above and below said predetermined normal temperature.
References Cited (Backward Citations)
US1635831A
Cited
US2377222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |