Patent US3749485A successfully refreshed from Google Patents.
US3749485A
Expired / Lapsed
US
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Shadow-line projector for assembly reference
Assignee: Carter Products Co Inc
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Filing: 1970-12-10
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Granted: 1973-07-31
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Expires: 1990-12-10
Abstract
Abstract A shadow-line projector adapted to establish reference lines on a work surface, the lines being shadows cast by stripes located on a transparent sheet preferably carried by rollers capable of shifting the sheet to project a plurality of sets of reference lines in sequence.
Inventors
- 👤 A Carter
- 👤 C Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:04
CPC Classifications
B; B27; B27B; B27B31/00; B27B31/06; G; G03; G03B; G03B15/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
In a shadow line projector, having a linear light source, a frame connected to said light source, and shadow generating means mounted on said frame to intercept light from said source and generate a shadow, an improved shadow-generating means comprising; a transparent sheet having successive groups of interrelated opaque stripes disposed parallel to said linear light source; a pair of rollers parallel to said linear light source mounted, respectively, on opposite sides of the frame and connected, respectively, to opposite ends of said sheet; a transparent panel carried by said frame in supporting contact with the portion of said sheet extending between said rollers; at least one transparent stiffener beam affixed to said panel on the face thereof opposite that which supports eaid sheet; and a transparent flattening plate carried by said frame and on the opposite side of said portion of said sheet from said panel.
Claim 2
Dependent Claim
147 words
In a shadow line projector, having a linear light source, a frame connected to said light source, and shadow generating means mounted on said frame to intercept light from said source and generate a shadow, an improved shadow-generating means comprising; a transparent sheet having successive groups of interrelated opaque stripes disposed parallel to said linear light source; a pair of rollers parallel to said linear light source mounted, respectively, on opposite sides of the frame and connected, respectively, to opposite ends of said sheet; a transparent panel carried by said frame in supporting contact with the portion of said sheet extending between said rollers; at least one transparent stiffener beam affixed to said panel on the face thereof opposite that which supports eaid sheet; and a transparent flattening plate carried by said frame and on the opposite side of said portion of said sheet from said panel.
Claim 3
Dependent Claim
17 words
A Projector as defined in claim 1, wherein at least one of said panel andplate are perforated.
Claim 4
Dependent Claim
30 words
A projector as defined in claim 1, wherein said sheet is of a material selected to normally exhibit electrostatic attraction to at least one of said panel and said plate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |