US3652155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide projector with controlled slide changer and separate holder
Assignee: Braun GmbH
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Filing: 1969-07-30
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Granted: 1972-03-28
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Expires: 1989-07-30
Abstract
Abstract A system for projecting slides in which the slide to be projected is selected from an input such as depressed key switches. A slide holder subdivided into individual compartments each retaining a slide, is then moved into position so that the selected slide is accessible for projection. A followup switch coupled from the viewpoint of motion, to the slide holder, provides signals of the position of the holder and thereby the location of the individual slides with respect to the projector unit. Indicating circuitry is used to determine when the signals transmitted from the depressed key switches are equal to the signals provided by the followup switch, whereupon the slide holder becomes held in position. A slide changer then transfers the slide from the compartment selected, and into the projecting plane of the projector. The drive for the slide holder is reversible so that the holder takes the shortest path in reaching a selected slide.
Inventors
- 👤 Josef Scheibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:54
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
307 words
Slide projector arrangement, comprising, in combination, slide changing means; slide holder means having a plurality of slide holding compartments; first driving means operative upon energization to drive said slide holding means in a selected one of a first and second direction along a predetermined path including said slide changing location; second driving means operative when energized to drive said slide changing means between said slide changing location and said projecting location; voltage furnishing means; a plurality of first contact means operable by said first and second driving means at predetermined instants in the movement of said slide changing means and said slide holder means; switching element means having associated second contact means operable from a first to a second state upon energization of said switching element means; a first, second and third terminal; interconnecting means interconnecting said first and second driving means, said first and second contact means, said voltage furnishing means, said switching element means and said first, second and third circuit terminal in such a manner that additional connection between said first and second terminal initiates an operating cycle wherein said slide holder means move along said predetermined path in said first direction, and additional connection between said first, second and third terminals initiates an operating cycle wherein said slide holder means moves along said predetermined path in said second direction; and remote control means having electrical connection to said first, second and third terminal for selectively furnishing one of said additional connections to initiate a corresponding one of said operating cycles, and to remove said additional connection to terminate said operating cycle, said second contact means including holding contact means interconnected with said first contact means for maintaining energization of said switching element means following removal of said additional connection, until said slide holder means is correctly positioned relative to said slide changing location.
Claim 2
Dependent Claim
307 words
Slide projector arrangement, comprising, in combination, slide changing means; slide holder means having a plurality of slide holding compartments; first driving means operative upon energization to drive said slide holding means in a selected one of a first and second direction along a predetermined path including said slide changing location; second driving means operative when energized to drive said slide changing means between said slide changing location and said projecting location; voltage furnishing means; a plurality of first contact means operable by said first and second driving means at predetermined instants in the movement of said slide changing means and said slide holder means; switching element means having associated second contact means operable from a first to a second state upon energization of said switching element means; a first, second and third terminal; interconnecting means interconnecting said first and second driving means, said first and second contact means, said voltage furnishing means, said switching element means and said first, second and third circuit terminal in such a manner that additional connection between said first and second terminal initiates an operating cycle wherein said slide holder means move along said predetermined path in said first direction, and additional connection between said first, second and third terminals initiates an operating cycle wherein said slide holder means moves along said predetermined path in said second direction; and remote control means having electrical connection to said first, second and third terminal for selectively furnishing one of said additional connections to initiate a corresponding one of said operating cycles, and to remove said additional connection to terminate said operating cycle, said second contact means including holding contact means interconnected with said first contact means for maintaining energization of said switching element means following removal of said additional connection, until said slide holder means is correctly positioned relative to said slide changing location.
Claim 3
Dependent Claim
15 words
An arrangement as set forth in claim 1, wherein said additional connection is a short-circuit.
Claim 4
Dependent Claim
49 words
An arrangement as set forth in claim 2, wherein said switching element means comprise first and second relay means; wherein said additional connection between said first and second terminals energizes said first relay and said additional connection between said first, second and third terminals energizes said second relay means.
Claim 5
Dependent Claim
79 words
An arrangement as set forth in claim 3, wherein said first contact means comprise a first selected contact pair furnishing a counting signal upon each passage of one of said slide holder compartments through said slide changing location; and wherein said remote control means comprises first and second manually operated keying means for furnishing said additional connections respectively energizing said first and second relay means, and counting means for counting said counting signals and furnishing a visual indication thereof.
Claim 6
Dependent Claim
43 words
An arrangement as set forth in claim 4, wherein said counting means comprise means for counting forward in response to manual operation of said first keying means, and means for counting in reverse in response to manual operation of said second keying means.
Claim 7
Dependent Claim
145 words
An arrangement as set forth in claim 1, wherein said remote control means comprise first and second resistance means, said first resistance means having a plurality of taps corresponding to said plurality of slide compartments; null indicator means having a first and second input; a plurality of selector switches, each for selecting a slide in a corresponding slide compartment, each connecting one of said taps of said first resistance means to said first input of said null indicator means; wiper arm means connecting said second resistance Means to said null indicator means; means driving said wiper arm in synchronism with said slide holder means; said null indicator means comprising means for short-circuiting said first and second or said first, second and third terminals in response to potential differences of first and second polarity respectively between said first and second input of said null indicator means.
Claim 8
Dependent Claim
177 words
An arrangement as set forth in claim 6, wherein said null indicator means comprise first and second null indicator relay means, each of said null indicator relay means having a coil and normally open contacts controlled by flow of current through said coil; first and second diode means connected in series with said first and second null indicator relay coils respectively; means connecting said first null indicator relay coil in series with said diode from said first to said second input of said null indicator means; means connecting said second null indicator relay coil in series with said second diode from said first to said second input in such a manner that current therethrough flows in opposite direction to current flowing through said first null indicator relay coil; and means connecting said normally open contact associated with said first null indicator relay means from said first to said second terminal and said normally open contacts associated with said second null indicator relay means from said first to said second and from said first to said third terminals.
Claim 9
Dependent Claim
22 words
An arrangement as set forth in claim 6, wherein said first and second resistance means each comprise a row of series-connected resistors.
Claim 10
Dependent Claim
19 words
An arrangement as set forth in claim 6, wherein said first and second resistance means each comprise a potentiometer.
Claim 11
Dependent Claim
157 words
An arrangement as set forth in claim 1, wherein said remote control means comprise a plurality of series connected diode means; a source of AC voltage; a plurality of selector switch means, each having a movable contact connected to the anode of one of said diode means, a normally open contact connected to said source of AC voltage and a normally closed contact; follow-up switching means having a plurality of contacts each connected to one of said normally closed contacts of said selector switching means and a movable wiper arm; null indicator means having a first input connected to said movable wiper arm and a second input connected to the source of AC voltage; and means driving said wiper contact of said follow-up switching means in synchronism with said slide holding means, said null indicator means furnishing one of said additional connections in response to a potential difference of predetermined polarity between said first and second inputs.
Claim 12
Dependent Claim
140 words
An arrangement as set forth in claim 1, wherein said slide holder compartments comprise a plurality of groups, each of said groups comprising a plurality of said slide holder compartments, whereby each of said slides has an associated group number and an associated compartment number; and wherein said remote control means comprise selector means for selecting said associated group number and said associated compartment number of a selected one of said slides, first control means furnishing said additional connection between said first and second or said first, second and third terminals until said one of said slide holder compartments having said desired group number is in said slide changing location, and second control means operative after said first control means for furnishing said additional connection until said slide holder compartment having said desired slide is in said slide changing location.
Claim 13
Dependent Claim
20 words
An arrangement as set forth in claim 1, further comprising means for increasing the speed of said first driving means.
Claim 14
Dependent Claim
18 words
An arrangement as set forth in claim 4, further comprising computing means connected to said remote control means.
Claim 15
Dependent Claim
23 words
An arrangement as set forth in claim 6, further comprising programming means connected to said remote control means for activating said selectOr switches.
Claim 16
Dependent Claim
65 words
An arrangement as set forth in claim 1, further comprising first housing means enclosing said remote control means, thereby constituting a remote control module; second housing means enclosing said arrangement excluding said remote control means, said so-enclosed arrangement constituting a projector module; further comprising additional projector modules; additional control modules; and means interconnecting said projector module, control module, additional projector modules, and additional control modules.
References Cited (Backward Citations)
US2471075A
Cited
US3140433A
Cited
US3174395A
Cited
US3243780A
Cited
US3225652A
Cited
US3372502A
Cited
US3296727A
Cited
US3467901A
Cited
US3510215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |