US3883239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic slide-projectors
Assignee: Individual
•
Filing: 1973-05-11
•
Granted: 1975-05-13
•
Expires: 1993-05-11
Abstract
Abstract A photographic slide projector of the type having an optical projection system to which slides are fed one by one from a magazine and from which they are returned one by one to the magazine. The projector comprises a movable pusher slidably supporting a rigid fork which is provided with an aperture in which are releasably engagable the flexible limbs of a resilient clip carried by the pusher. When the pusher is moved towards the magazine the limbs of the clip pass into the aperture and are caused to grip a slide such that upon reverse movement of the pusher the slide is carried by the clip which in turn engages the fork at the aperture to carry the same therewith until the slide has been brought in front of the optical projection system. Thereupon the slide is halted in position and the clip releases from the slide. Continued movement of the pusher results in abutment of the fork against a stop and release of the clip from the aperture of the fork. A spring impels the fork in reverse direction and buffers attached to the fork return the slide to the magazine subsequent to its projection.
Inventors
- 👤 Serge Besancenot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/04; G03B23/046; G03B23/044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
175 words
A photographic slide-projector of the type incorporating an optical projection system to which the slides are to be fed by forward travel one by one from a magazine and from which they are to be returned one by one to the magazine comprising a movable pusher, a resilient clip carried by said pusher and including flexible limbs able to grip a slide to be projected when the latter is in the magazine so as to extract the slide therefrom and to feed it in front of the optical projection system, first means on said pusher haVing an aperture in which said limbs are insertable for closing the resilient clip to grip a slide in the clip in this state during forward travel of the pusher, and removable from said aperture for opening the clip upon arrival of the slide in front of the optical system and subsequent forward travel of the pusher beyond said slide being positioned in front of the optical system, and second means for returning the slide, after projection, to the magazine.
Claim 2
Dependent Claim
175 words
A photographic slide-projector of the type incorporating an optical projection system to which the slides are to be fed by forward travel one by one from a magazine and from which they are to be returned one by one to the magazine comprising a movable pusher, a resilient clip carried by said pusher and including flexible limbs able to grip a slide to be projected when the latter is in the magazine so as to extract the slide therefrom and to feed it in front of the optical projection system, first means on said pusher haVing an aperture in which said limbs are insertable for closing the resilient clip to grip a slide in the clip in this state during forward travel of the pusher, and removable from said aperture for opening the clip upon arrival of the slide in front of the optical system and subsequent forward travel of the pusher beyond said slide being positioned in front of the optical system, and second means for returning the slide, after projection, to the magazine.
Claim 3
Dependent Claim
108 words
A projector as claimed in claim 1, wherein the first means comprises a rigid fork provided with said aperture, said fork being situated in the path of the clip so that the limbs of the clip are impelled towards their closed position by the fork when the limbs of the clip pass through the aperture and are opposite the slide to be projected, the fork being movable with the clip during travel of the pusher to an operative position in which the slide is in front of the optical system, and means for disengaging the clip from the fork when the clip is advanced beyond said operative position.
Claim 4
Dependent Claim
107 words
A projector as claimed in claim 2, wherein the means for disengaging the clip from the fork comprises sloping shoulders on the outside of the flexible limbs of the clip for co-operating with the inner faces of the fork at said aperture, and a stop situated in the path of the fork so as to arrest forward travel of the fork while allowing travel of the clip, which then frees itself from the fork as a result of inward elastic deformation of its limbs, said limbs moving apart elastically after having left the aperture in the fork, and means for returning the fork to its original position.
Claim 5
Dependent Claim
21 words
A projector as claimed in claim 3, wherein the means for returning the fork to its original position comprises a spring.
Claim 6
Dependent Claim
32 words
A projector as claimed in claim 4, wherein the spring has one end connected to the fork and another end connected to the pusher, said fork being slidably mounted on said pusher.
Claim 7
Dependent Claim
45 words
A projector as claimed in claim 2, wherein the means for returning the slide, after projection, to the magazine comprises a buffer rigidly attached to said fork and having a working race situated in a plane substantially at right angles to that of the slide.
References Cited (Backward Citations)
US3055522A
Cited
US3348450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |