Patent US2774453A successfully refreshed from Google Patents.
US3818162A
Expired / Lapsed
US
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Treadle switch
Assignee: Boeing Co
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Filing: 1972-12-06
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Granted: 1974-06-18
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Expires: 1992-12-06
Abstract
Abstract Disclosed is a treadle switch adapted for placement in an excavation in a roadway with the outer lateral extremities of the switch coplanar with the roadway surface. The central longitudinal portion of the upper portion is elevated above the plane of the roadway surface and carries an electric contact plate on its lower surface within a central longitudinally disposed cavity in register with a lower contact plate. The switch is designed to absorb kinetic energy from the tire tread striking the switch surface when a vehicle passes thereover at high speeds.
Inventors
- 👤 G Monroe
- 👤 Bose R Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:25
CPC Classifications
H; H01; H01H; H01H3/00; H01H3/02; H01H3/14; H01H3/141; H01H3/142; H01B; H01B7/00; H01B7/10; H01B7/104; H01B7/108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
231 words
A switch for mounting transversely on a roadway and detecting vehicular traffic passing thereover comprising: an elongated body having upper and lower wall sections joined to form an elongated cavity therebetween and adapted to be mounted with the outer lateral extremities of the top surface of said upper wall section substantially coplanar with the roadway surface, the central longitudinally extending portion of the top surface of said upper wall section extending above the plane of the roadway surface, a first electrical contact surface secured to and substantially centrally and longitudinally disposed along the top surface of said lower wall section, a second electrical contact surface secured to and substantially centrally and longitudinally disposed along the bottom surface said second electrical contact surface comprising a strip of relatively low mass electrical conducting material, of said upper wall section and spaced from and substantially in register with said first contact surface, the upper wall section having relatively thin opposed cantilevered sides the length of said opposed cantileversed sides being approximately three to six times the thichness thereof, supporting and connected by the central portion to which the second contact is attached, the central portion extending between the side portions having a relatively low mass and lying generally in a horizontal plane with the planes of the cantilevered sides being inclined to the plane of the roadway surface by about 15* to about 25*.
Claim 2
Dependent Claim
231 words
A switch for mounting transversely on a roadway and detecting vehicular traffic passing thereover comprising: an elongated body having upper and lower wall sections joined to form an elongated cavity therebetween and adapted to be mounted with the outer lateral extremities of the top surface of said upper wall section substantially coplanar with the roadway surface, the central longitudinally extending portion of the top surface of said upper wall section extending above the plane of the roadway surface, a first electrical contact surface secured to and substantially centrally and longitudinally disposed along the top surface of said lower wall section, a second electrical contact surface secured to and substantially centrally and longitudinally disposed along the bottom surface said second electrical contact surface comprising a strip of relatively low mass electrical conducting material, of said upper wall section and spaced from and substantially in register with said first contact surface, the upper wall section having relatively thin opposed cantilevered sides the length of said opposed cantileversed sides being approximately three to six times the thichness thereof, supporting and connected by the central portion to which the second contact is attached, the central portion extending between the side portions having a relatively low mass and lying generally in a horizontal plane with the planes of the cantilevered sides being inclined to the plane of the roadway surface by about 15* to about 25*.
Claim 3
Dependent Claim
45 words
A switch as defined in claim 1 wherein said first electrical contact surface comprises a metallic ribbon and the portion of the top surface of said lower wall section to which ribbon is attached is elevated from the general plane of said lower wall section.
Claim 4
Dependent Claim
35 words
A switch as defined in claim 2 wherein the top surface portions of said lower wall section adjacent said central portion slope downwardly to substantially conform to the contour of the corresponding upper wall sections.
Claim 5
Dependent Claim
29 words
A switch as defined in claim 2 wherein said second electrical contact surface comprises a strip of electrically conductive rubber supporting therein a flexible screen of electrically conductive metal.
Claim 6
Dependent Claim
29 words
A switch as defined in claim 4 wherein the horizontal width of said second electrical contact surface is less than the horizontal width of said first electrical contact surface.
Claim 7
Dependent Claim
42 words
A switch as defined in claim 1 wherein the top surface of said central portion of said upper wall section projects above the plane of the roadway surface a distance at least as great as the distance separating said electrical contact surfaces.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |