Patent US3873195A successfully refreshed from Google Patents.
US3873195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide tray
Assignee: 3M Co
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Filing: 1973-07-05
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Granted: 1975-03-25
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Expires: 1993-07-05
Abstract
Abstract A circular slide tray in which the guide walls defining the slide receiving slots terminate spaced from the hub to provide close packing of adjacent slides at the hub. The guide walls are recessed at one face of the tray, the recess being beveled progressing radially and axially inward of the tray to provide proper alignment of the slide receiving slots with a slide projector by the normal slide pusher bar. And, a slide retaining strip extends around the hub and has straight fibers extending radially therefrom to guide and retain the edges of the slides adjacent the hub to maintain the slides in proper alignment.
Inventors
- 👤 Robert B Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:23
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
331 words
A circular slide tray comprising: a cylindrical hub, a base wall extending from one end of said hub perpendicular to the axis of said hub, a peripheral edge wall extending perpendicularly from said base wall around said hub to define an annular slide receiving area between said edge wall and said hub, a plurality of similar equally spaced slide guide walls extending from said peripheral edge wall radially inward toward said hub and terminating spaced from said hub to provide close packing of adjacent slides at said hub, two adjacent guide walls defining with said edge wall and said hub a slide receiving slot, a slide retaining strip extending around said hub and having straight fibers extending radially therefrom into each of said slide receiving slots to guide and retain the edges of slides adjacent said hub, and means adapted to engage a slide projector for stepwise advancement of said tray to align sucessive slide receiving slots with a slide pusher bar and a fixed opening in the projector into which a slide is to be pushed, said base wall being formed with openings communicating with each of said slide receiving slots for access by a slide pusher bar and movement thereof parallel to the axis of said hub to remove a slide from a said slot and said slide guide walls being recessed in axial alignment with said openings and being beveled at the end of the recess in a direction progressing axially and radially inward of the tray, adjacent slide guide walls at the beveled portions thereof axially nearest the aligned pusher bar opening being spaced a distance greater than the corresponding thickness of the slide pusher bar and progressing radially inward along said beveled portions to a spacing distance equal to the thickness of the slide pusher bar for engagement thereby to precisely align the slide receiving slot between said adjacent slide guide walls with the opening in the projector into which a slide is to be pushed.
Claim 2
Dependent Claim
331 words
A circular slide tray comprising: a cylindrical hub, a base wall extending from one end of said hub perpendicular to the axis of said hub, a peripheral edge wall extending perpendicularly from said base wall around said hub to define an annular slide receiving area between said edge wall and said hub, a plurality of similar equally spaced slide guide walls extending from said peripheral edge wall radially inward toward said hub and terminating spaced from said hub to provide close packing of adjacent slides at said hub, two adjacent guide walls defining with said edge wall and said hub a slide receiving slot, a slide retaining strip extending around said hub and having straight fibers extending radially therefrom into each of said slide receiving slots to guide and retain the edges of slides adjacent said hub, and means adapted to engage a slide projector for stepwise advancement of said tray to align sucessive slide receiving slots with a slide pusher bar and a fixed opening in the projector into which a slide is to be pushed, said base wall being formed with openings communicating with each of said slide receiving slots for access by a slide pusher bar and movement thereof parallel to the axis of said hub to remove a slide from a said slot and said slide guide walls being recessed in axial alignment with said openings and being beveled at the end of the recess in a direction progressing axially and radially inward of the tray, adjacent slide guide walls at the beveled portions thereof axially nearest the aligned pusher bar opening being spaced a distance greater than the corresponding thickness of the slide pusher bar and progressing radially inward along said beveled portions to a spacing distance equal to the thickness of the slide pusher bar for engagement thereby to precisely align the slide receiving slot between said adjacent slide guide walls with the opening in the projector into which a slide is to be pushed.
Claim 3
Dependent Claim
308 words
A circular slide tray comprising: a cylindrical hub, a base wall extending from one end of said hub perpendicular to the axis of said hub, a peripheral edge wall extending perpendicularly from said base wall around said hub to define an annnular slide receiving area between said edge wall and said hub, a plurality of similar equally spaced slide guide walls extending from said peripheral edge wall radially inward toward said hub and terminating spaced from said hub to provide close packing of adjacent slides at said hub, two adjacent guide walls defining with said edge wall and said hub a slide receiving slot, means for retaining a slide in each said slide receiving slot, and means adapted to engage a slide projector for stepwise advancement of said tray to align successive slide receiving slots with a slide pusher bar and a fixed opening in the projector into which a slide is to be pushed, said base wall being formed with openings communicating with each of said slide receiving slots for access by a slide pusher bar and movement thereof parallel to the axis of said hub to remove a slide from a said slot and said slide guide walls being recessed in alignment with said openings and being beveled at the end of the recess in a direction progressing axially and radially inward of the tray, adjacent slide guide walls at the beveled portions thereof axially nearest the aligned pusher bar opening being spaced a distance greater than the corresponding thickness of the slide pusher bar and progressing radially inward along said beveled portions to a spacing distance equal to the thickness of the slide pusher bar for engagement thereby to precisely align the slide receiving slot between said adjacent slide guide walls with the opening in the projector into which a slide is to be pushed.
Claim 4
Dependent Claim
308 words
A circular slide tray comprising: a cylindrical hub, a base wall extending from one end of said hub perpendicular to the axis of said hub, a peripheral edge wall extending perpendicularly from said base wall around said hub to define an annnular slide receiving area between said edge wall and said hub, a plurality of similar equally spaced slide guide walls extending from said peripheral edge wall radially inward toward said hub and terminating spaced from said hub to provide close packing of adjacent slides at said hub, two adjacent guide walls defining with said edge wall and said hub a slide receiving slot, means for retaining a slide in each said slide receiving slot, and means adapted to engage a slide projector for stepwise advancement of said tray to align successive slide receiving slots with a slide pusher bar and a fixed opening in the projector into which a slide is to be pushed, said base wall being formed with openings communicating with each of said slide receiving slots for access by a slide pusher bar and movement thereof parallel to the axis of said hub to remove a slide from a said slot and said slide guide walls being recessed in alignment with said openings and being beveled at the end of the recess in a direction progressing axially and radially inward of the tray, adjacent slide guide walls at the beveled portions thereof axially nearest the aligned pusher bar opening being spaced a distance greater than the corresponding thickness of the slide pusher bar and progressing radially inward along said beveled portions to a spacing distance equal to the thickness of the slide pusher bar for engagement thereby to precisely align the slide receiving slot between said adjacent slide guide walls with the opening in the projector into which a slide is to be pushed.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |