US4834310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film spool
Assignee: Konica Minolta Inc
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Filing: 1988-01-19
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Granted: 1989-05-30
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Expires: 2008-01-19
Abstract
Abstract The invention provides a spool for winding a photographic roll film. The spool has a bar-shaped spool core which is slitted to lengthwise direction to form a slit for inserting a tongue-shaped end of the film having a through hole. On an inside wall of the slit, there is provided a catch claw capable of engaging the through hole. On another inside wall opposite to the above inside wall, there is provided a pressing rib for pressing and guiding the tongue-shaped end to the catch claw. A part of the outer surface of the spool core, adjoining to the inside wall of the slit in which is disposed the pressing rib, is shaped to serve as a film contact surface. The tip surface of the pressing rib and the film contact surface both jointly form a continuous shape of a circular arc.
Inventors
- 👤 Toshiyuki Ikariya
- 👤 Kiyohiko Takahashi
- 👤 Osamu Shibazaki
- 👤 Nori Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:12
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/02; G03B1/04; B; B65; B65H; B65H75/00; B65H75/02; B65H75/18; B65H75/28; G03B17/00; G03B17/28; G03B17/30; G03B2217/00; G03B2217/26; G03B2217/261
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A spool for a photographic roll film, said spool comprising: a bar-shaped spool core having a lengthwise slit therein, said slit being adapted to accept the insertion of a film end, said film end being tongue-shaped and having a hole therethrough, engaging means disposed on a first inside wall of said slit for arresting the tongue-shaped end of the film by engaging the hole, a pressing rib disposed on a second inside wall of said slit opposite the first inside wall, said pressing rib pressing and guiding the tongue-shaped end of the film so as to cause engagement with said engaging means, and an outer surface of said spool core, said outer surface comprising; a film contact surface adjoining a surface of the second inside wall, said film contact surface and a tipped surface of said pressing rib jointly forming a continuous circular arc.
Claim 2
Dependent Claim
144 words
A spool for a photographic roll film, said spool comprising: a bar-shaped spool core having a lengthwise slit therein, said slit being adapted to accept the insertion of a film end, said film end being tongue-shaped and having a hole therethrough, engaging means disposed on a first inside wall of said slit for arresting the tongue-shaped end of the film by engaging the hole, a pressing rib disposed on a second inside wall of said slit opposite the first inside wall, said pressing rib pressing and guiding the tongue-shaped end of the film so as to cause engagement with said engaging means, and an outer surface of said spool core, said outer surface comprising; a film contact surface adjoining a surface of the second inside wall, said film contact surface and a tipped surface of said pressing rib jointly forming a continuous circular arc.
Claim 3
Dependent Claim
39 words
The spool of claim 1 wherein said outer surface further comprises a flat surface parallel to the first and second inside walls of said slit, said flat surface setting a position of said spool during winding of said film.
Claim 4
Dependent Claim
59 words
The spool of claim 2 wherein flanges are provided at both sides of said spool core, said flanges joining said spool core at a top surface of a circumferential portion of said spool core and a protrusion on said flat surface for raising the height of said flat surface to be substantially equal to that of said top surface.
Claim 5
Dependent Claim
24 words
The spool of claim 1, wherein the radius of curvature of said pressing rib is substantially same with that of said film contact surface.
Claim 6
Dependent Claim
16 words
The spool of claim 1, wherein said slit is formed to pass through said spool core.
Claim 7
Dependent Claim
37 words
The spool of claim 1, wherein said engaging means is shaped in a form of catch claws, and wherein there are provided at least two pieces of said catch claws on the inside wall of said slit.
Claim 8
Dependent Claim
35 words
The spool of claim 1, wherein there are provided two pieces of said catch claws, and wherein said pressing rib is arranged to locate at a center position between two pieces of said catch claws.
Claim 9
Dependent Claim
17 words
The spool of claim 1, wherein said film contact surface of said spool core is slitted widthwise.
References Cited (Backward Citations)
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US3361380A
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |