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US4054791A Expired / Lapsed US ⏱️ 0.0 years remaining

Portable lantern with high speed rotatory beam

Assignee: Individual
•
Filing: 1975-02-06
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Granted: 1977-10-18
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Expires: 1995-02-06
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Abstract

Abstract A portable lantern comprising a housing having a transparent lens section, an electric light source mounted within said housing, reflector means rotatably mounted within the transparent section of said housing and disposed to project light emitted by said electric light through the transparent section of said housing in a substantially horizontal beam of increased intensity, means for continuously rotating said reflector means at a speed so that a light beam is projected thereby in a circular pattern through said transparent section at a frequency which produces the effect of continuous illumination, and battery power means for energizing said electric light source and reflector rotating means arranged within said housing, said portable lantern being suitable for providing substantially continuous illumination over a large area.

Inventors

  • 👤 Harold P. Du Shane

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 10:05
CPC Classifications
F; F21; F21L; F21L2/00

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 247 words
A portable lantern suitable for providing general illumination of increased intensity for a large area comprising in combination: a. a portable lantern housing having a base section upon which said housing is independently supported and a transparent lens section removably secured thereto, said lens section having cover means removably secured thereto; b. an electric light source mounted within the transparent lens section of said housing; c. reflector means rotatably mounted for rotation at a continuous speed of at least about 600 revolutions per minute within the transparent section of said housing and disposed to project a concentrated, intensified beam of light from said light source into a substantially horizontal beam through the full 360° periphery of said transparent lens section; d. motor means mounted within said base section of said housing with the shaft thereof extending into said transparent lens section being connected to said rotatable reflector means for continuously rotating said reflector means about the axis of said motor shaft at a speed of at least about 600 revolutions per minute and projecting light through said transparent section in a circular pattern about said lantern at a frequency that exceeds the threshold of discrimination of the human eye and provides continuous general illumination for a large area about said lantern; e. electric power means arrange within said housing for energizing said light source and said reflector means; and f. electric switch means mounted on said housing for said electric light source and said reflector rotating means.
Claim 2
Dependent Claim 247 words
A portable lantern suitable for providing general illumination of increased intensity for a large area comprising in combination: a. a portable lantern housing having a base section upon which said housing is independently supported and a transparent lens section removably secured thereto, said lens section having cover means removably secured thereto; b. an electric light source mounted within the transparent lens section of said housing; c. reflector means rotatably mounted for rotation at a continuous speed of at least about 600 revolutions per minute within the transparent section of said housing and disposed to project a concentrated, intensified beam of light from said light source into a substantially horizontal beam through the full 360° periphery of said transparent lens section; d. motor means mounted within said base section of said housing with the shaft thereof extending into said transparent lens section being connected to said rotatable reflector means for continuously rotating said reflector means about the axis of said motor shaft at a speed of at least about 600 revolutions per minute and projecting light through said transparent section in a circular pattern about said lantern at a frequency that exceeds the threshold of discrimination of the human eye and provides continuous general illumination for a large area about said lantern; e. electric power means arrange within said housing for energizing said light source and said reflector means; and f. electric switch means mounted on said housing for said electric light source and said reflector rotating means.
Claim 3
Dependent Claim 21 words
A portable lantern as claimed in claim 1 wherein said reflector means concentrates and intensifies light from said electric light source.
Claim 4
Dependent Claim 40 words
A portable lantern as claimed in claim 1 which includes a reflector separate from said rotatable reflector means that concentrates and intensifies light from said electric light source and projects said intensified beam of light onto said rotatable reflector means.
Claim 5
Dependent Claim 24 words
A portable lantern as claimed in claim 1 wherein said electric light source is mounted within the cover means of said transparent lens section.
Claim 6
Dependent Claim 37 words
A portable lantern as claimed in claim 4 wherein said electric light source includes a reflector disposed to concentrate and intensify light from light source and project a concentrated beam of light onto said rotatable reflector means.
Claim 7
Dependent Claim 24 words
A portable lantern as claimed in claim 1 wherein said electric switch means saparately control said electric light source and said reflector rotating means.
Claim 8
Dependent Claim 42 words
A portable lantern as claimed in claim 1 wherein said rotatable reflector means comprises a parabolic reflector that concentrates and intensifies the light from said light source and that is mounted with the axis of rotation thereof about said electric light source.
Claim 9
Dependent Claim 36 words
A portable lantern as claimed in claim 7 wherein said rotatable reflector means and said electric light source concurrently rotate with the axis of rotation thereof being centered through the filament of said electric light source.
Claim 10
Dependent Claim 20 words
A portable lantern as claimed in claim 1 including means for varying the speed of rotation of said motor means.

References Cited (Backward Citations)

US2748371A Cited
US2719282A Cited
US2814029A Cited
US2846663A Cited
US3266014A Cited
US3764799A Cited
US3866032A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-10-17 1981-04-18 1981-10-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-10-17 1985-04-18 1985-10-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-10-17 1989-04-18 1989-10-18 $7700.00 Window Closed / Lapsed

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