Patent US4136948A successfully refreshed from Google Patents.
US4136948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic enlarger
Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
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Filing: 1977-08-22
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Granted: 1979-01-30
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Expires: 1997-08-22
Abstract
Abstract The invention relates to a photographic enlarger having an exchangeable film trap disposed in a projection head for receiving film, a magnifying lens disposed on one side of the film trap, and an insert member including a light deflection mirror and a condenser abutting the film trap; the insert member is disposed on the other side of the film trap.
Inventors
- 👤 Claus Prochnow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:36
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/326
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
A photographic enlarger, comprising in combination: a projection head including a housing, said projection head having a projection axis and an exchangeable film trap for receiving a film, a magnifying lens disposed on one side of said film trap, an insert member including a light-deflection mirror and a condensor abutting the film trap, said projection head being split into first and second parts at least within the region of said film trap along a plane at an angle to the projection axis, the first part including said insert member, the second part being detachable from the first part and including said magnifying lens, sad insert member being guidable within said first part in opposite predetermined directions, resiliently yieldable means disposed in said first part for exerting a force on said insert member in one of said predetermined directions so as to press said insert member and said condensor against said film trap, and manually releasable locking means disposed in said projection head for locking said insert member in a predetermined position against the force of said resiliently yieldable means.
Claim 2
Dependent Claim
179 words
A photographic enlarger, comprising in combination: a projection head including a housing, said projection head having a projection axis and an exchangeable film trap for receiving a film, a magnifying lens disposed on one side of said film trap, an insert member including a light-deflection mirror and a condensor abutting the film trap, said projection head being split into first and second parts at least within the region of said film trap along a plane at an angle to the projection axis, the first part including said insert member, the second part being detachable from the first part and including said magnifying lens, sad insert member being guidable within said first part in opposite predetermined directions, resiliently yieldable means disposed in said first part for exerting a force on said insert member in one of said predetermined directions so as to press said insert member and said condensor against said film trap, and manually releasable locking means disposed in said projection head for locking said insert member in a predetermined position against the force of said resiliently yieldable means.
Claim 3
Dependent Claim
31 words
A photographic enlarger according to claim 1, further comprising guidance means disposed in said first part for guiding said insert member and for forming a support for said resiliently yieldable means.
Claim 4
Dependent Claim
66 words
A photographic enlarger according to claim 2, wherein said guidance means includes two juxtaposed rails extending from the projection head housing inwardly in said one of said predetermined directions, said rails having respective guidance slits, and further comprising a guidance rod disposed on said insert member, and wherein said resiliently yieldable means includes a spring disposed between said guidance rod, said housing, and said juxtaposed rails.
Claim 5
Dependent Claim
70 words
An enlarger according to claim 3, wherein said insert member has two walls disposed opposite one another, and wherein said light-deflection mirror forms a third wall of said insert member and is disposed at an angle with respect to the oppositely disposed walls, the oppositely disposed walls extending in a predetermined region beyond said third wall, said guidance rod being supported by said oppositely disposed walls within said predetermined region.
Claim 6
Dependent Claim
53 words
An enlarger according to claim 1, wherein said housing is formed with a plurality of walls, and further comprising guidance track means disposed in said first part at a distance from one of said walls for facilitating the insertion of said insert member into said projection head with a predetermined amount of play.
Claim 7
Dependent Claim
59 words
An enlarger according to claim 5, wherein said manually releasable locking means includes two lugs projecting from oppositely disposed sides of said insert member, each lug having a respective recess, and two springs disposed on two of said walls adjacent said lugs, and engaging said recesses, respectively, when said locking means lock said insert member in said predetermined position.
Claim 8
Dependent Claim
21 words
An enlarger according to claim 1, further comprising handling means connected to said insert member and projecting from said projection head.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |