Patent US3791622A successfully refreshed from Google Patents.
US3791622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indexing mechanism
Assignee: Bell and Howell Co
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Filing: 1972-01-26
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Granted: 1974-02-12
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Expires: 1992-01-26
Abstract
Abstract An indexing mechanism for sequentially presenting each of a plurality of cassettes containing photographic film to a projection station in a film projector. The indexing mechanism includes a pair of stop members that are alternately placed in and out of engagement with an abutment on the cassette.
Inventors
- 👤 A Nupnau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:38
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/321; G03B21/323
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
243 words
An indexing mechanism in a film projector comprising: well means for receiving a plurality of cassettes stacked in side-byside relation, each of said cassettes including an abutment means; means associated with said well means for urging said stack of cassettes along a travel path toward a projection station in said projector; stop means including a front stop rod and a back stop rod mounted in parallel with one another for reciprocating movement orthogonally into and out of the travel path of said stack of cassettes for engaging the abutment means on the cassettes, said back rod positioning a leading cassette at said projection station and said front rod positioning a trailing cassette adjacent and prior to said projection station; and camming means for alternately reciprocating said front and back stop rods, said camming means having an elevated surface for moving said front and back stop rods into the travel path of said cassettes, a first lowered surface for moving said front stop rod out of the travel path of said cassettes and a second lowered surface for moving said back stop rod out of the travel path of said cassettes, said camming means placing said back stop rod into the travel path of said cassettes while placing said front stop rod out of the travel path of said cassettes, and placing said back stop rod out of the travel path while placing the front stop rod into the travel path of said cassettes.
Claim 2
Dependent Claim
243 words
An indexing mechanism in a film projector comprising: well means for receiving a plurality of cassettes stacked in side-byside relation, each of said cassettes including an abutment means; means associated with said well means for urging said stack of cassettes along a travel path toward a projection station in said projector; stop means including a front stop rod and a back stop rod mounted in parallel with one another for reciprocating movement orthogonally into and out of the travel path of said stack of cassettes for engaging the abutment means on the cassettes, said back rod positioning a leading cassette at said projection station and said front rod positioning a trailing cassette adjacent and prior to said projection station; and camming means for alternately reciprocating said front and back stop rods, said camming means having an elevated surface for moving said front and back stop rods into the travel path of said cassettes, a first lowered surface for moving said front stop rod out of the travel path of said cassettes and a second lowered surface for moving said back stop rod out of the travel path of said cassettes, said camming means placing said back stop rod into the travel path of said cassettes while placing said front stop rod out of the travel path of said cassettes, and placing said back stop rod out of the travel path while placing the front stop rod into the travel path of said cassettes.
Claim 3
Dependent Claim
22 words
The indexing mechanism of claim 1 wherein said front stop rod and said back stop rod are biased against said camming means.
Claim 4
Dependent Claim
56 words
The indexing mechanism of claim 1 wherein said camming means includes a third lowered surface cooperating with one of said first and second lowered surfaces to move both said front stop rod and said back stop rod out of the travel path of said cassettes to permit movement of said cassettes along the travel path thereof.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |