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US3580659A Expired / Lapsed US ⏱️ 0.0 years remaining

Portable traffic sign

Assignee: Ricoh Co Ltd
•
Filing: 1969-07-07
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Granted: 1971-05-25
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Expires: 1989-07-07
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Abstract

Abstract A portable traffic sign comprising a frame having a handle and a reflex reflecting plate which may be fixedly or more advantageously rotatably secured to the frame. For example, the portable traffic sign carried by a pedestrian crossing a street at night can give a positive warning to a driver.

Inventors

  • 👤 Yoshio Fukushima

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 22:31
CPC Classifications
G; G08; G08B; G08B5/00; G08B5/006; G02; G02B; G02B5/00; G02B5/12; G02B5/126

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 208 words
A portable traffic sign comprising: a handle; a frame fixed to and extending from said handle; a reflecting plate mounted to rotate within said frame on an axis parallel with and longitudinally bisecting said handle; said plate formed on one side by a first plurality of reflecting elements mounted therein in side-by-side relation; said plate formed on the other side by a second plurality of reflecting elements mounted therein in side-by-side relation; each reflecting element of said first plurality and said second plurality of reflecting elements having an outer spherical surface adapted to allow a light beam to pass in an entrance path therethrough and having an inner spherical surface adapted to reflect said light beam in a return path common to the entrance path; and said first plurality and said second plurality of reflecting elements having their inner spherical surfaces respectively bonded to each other said handle formed with an opening therein, a pair of pivot mountings being oppositely located on said axis in said frame to provide the rotation of said plate, one of said pivot mountings including a pin extending into said handle and having a part extending through said opening, said part having a ring mounted thereon for actuating rotation to rotate said plate.
Claim 2
Dependent Claim 208 words
A portable traffic sign comprising: a handle; a frame fixed to and extending from said handle; a reflecting plate mounted to rotate within said frame on an axis parallel with and longitudinally bisecting said handle; said plate formed on one side by a first plurality of reflecting elements mounted therein in side-by-side relation; said plate formed on the other side by a second plurality of reflecting elements mounted therein in side-by-side relation; each reflecting element of said first plurality and said second plurality of reflecting elements having an outer spherical surface adapted to allow a light beam to pass in an entrance path therethrough and having an inner spherical surface adapted to reflect said light beam in a return path common to the entrance path; and said first plurality and said second plurality of reflecting elements having their inner spherical surfaces respectively bonded to each other said handle formed with an opening therein, a pair of pivot mountings being oppositely located on said axis in said frame to provide the rotation of said plate, one of said pivot mountings including a pin extending into said handle and having a part extending through said opening, said part having a ring mounted thereon for actuating rotation to rotate said plate.
Claim 3
Dependent Claim 37 words
A portable traffic sign according to claim 1, in which the radius of curvature of each said inner spherical surface is greater than the radius of curvature of each said outer spherical surface in each reflecting element.
Claim 4
Dependent Claim 28 words
A portable traffic sign according to claim 1, in which spacing is provided between adjacent reflecting units, and said spacing is formed to absorb light beams incident thereon.

References Cited (Backward Citations)

US506012A Cited
US1987357A Cited
US2567233A Cited
US2559290A Cited
US2898878A Cited
US3449158A Cited
US3353897A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-05-24 1974-11-23 1975-05-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-05-24 1978-11-23 1979-05-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-05-24 1982-11-23 1983-05-25 $7700.00 Window Closed / Lapsed

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