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US3843247A Expired / Lapsed US ⏱️ 0.0 years remaining

Integrally molded circular tray for photographic slides

Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
•
Filing: 1973-03-23
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Granted: 1974-10-22
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Expires: 1993-03-23
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Abstract

Abstract A horizontally arranged circular magazine for a picture slide projector, of the type in which a ramp is provided for raising picture slides as rotation of the magazine carries successive slides to a point opposite the projection position, so that the bottom edge of the slide will clear the top edge of the low outer cylindrical wall of the magazine, a pusher mechanism then pushing the slide horizontally in a radial direction with respect to the circular magazine into the projection position within the projector. The radial partitions of the magazine, which separate individual slides from each other, are tapered to narrow in a downward direction through the major part of the radial extent of each partition, to provide upper edges which are thick enough to withstand normal usage, while the radially outermost portions of the partitions as well as the radially innermost portions thereof (overlying the inner cylindrical wall) are oppositely tapered, thinner at the top than at the bottom.

Inventors

  • 👤 R Sobotta

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 15:16
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/06

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 115 words
A circular tray for holding photographic slides in a series of radially extending compartments, said tray comprising an inner cylindrical wall, and outer cylindrical wall of less height than the inner cylindrical wall, a series of radial partitions extending from the inner cylindrical wall to the outer cylindrical wall, each partition having a central zone in which the cross section of the partition is tapered downwardly from a relatively thick upper edge to a substantially thinner lower edge, an inner zone radially inwardly from said central zone, and an outer zone radially outwardly from said central zone, the cross section of the partition being tapered upwardly in said inner zone and in said outer zone.
Claim 2
Dependent Claim 115 words
A circular tray for holding photographic slides in a series of radially extending compartments, said tray comprising an inner cylindrical wall, and outer cylindrical wall of less height than the inner cylindrical wall, a series of radial partitions extending from the inner cylindrical wall to the outer cylindrical wall, each partition having a central zone in which the cross section of the partition is tapered downwardly from a relatively thick upper edge to a substantially thinner lower edge, an inner zone radially inwardly from said central zone, and an outer zone radially outwardly from said central zone, the cross section of the partition being tapered upwardly in said inner zone and in said outer zone.
Claim 3
Dependent Claim 65 words
A tray as defined in claim 1, in which said tray has a bottom extending part way inwardly from the lower edge of said outer wall toward the lower edge of said inner wall, leaving a gap between said bottom and said inner wall to provide an annular recess for receiving a slide-elevating ramp when the tray is in use in association with a projector.
Claim 4
Dependent Claim 26 words
A tray as defined in claim 1, wherein said inner zone of each partition extends radially inwardly over the top edge of said inner cylindrical wall.
Claim 5
Dependent Claim 42 words
A tray as defined in claim 1, in which the bottom edge of said central zone of each partition is at an elevation substantially above said bottom, and in which said outer zone of each partition extends downwardly to meet said bottom.
Claim 6
Dependent Claim 29 words
A tray as defined in claim 1, in which transport teeth are formed on the lower surface of said bottom, said transport teeth being tapered in a downward direction.
Claim 7
Dependent Claim 19 words
A tray as defined in claim 5, in which said tray is formed as a single integral molded article.
Claim 8
Dependent Claim 19 words
A tray as defined in claim 1, in which said tray is formed as a single integral molded article.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-10-21 1978-04-22 1978-10-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-10-21 1982-04-22 1982-10-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-10-21 1986-04-22 1986-10-22 $7700.00 Window Closed / Lapsed

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