US3594082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide changer for an overhead projector
Assignee: Individual
•
Filing: 1969-07-31
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Granted: 1971-07-20
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Expires: 1989-07-31
Abstract
Abstract A slide changer attachment includes mating case sections pivotally connected by slidable adjustable arms which provide for selectively mounting the attachment on various overhead slide projectors of different widths. An intermediate panel is mounted one of the case sections and supports a sliding feed plate adjacent the bottom of a hopper. The feed plate is connected to an endless belt driven by a reversible motor controlled by a circuit including a manually actuated switch, a set of limit switches and a relay to effect automatic reciprocation of the feed plate.
Inventors
- 👤 Thomas M Lonchar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:15
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/132; Y; Y10; Y10S; Y10S353/00; Y10S353/05
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
238 words
An improved slide changer for use as an attachment on an overhead slide projector having two opposed sides, comprising first and second generally rectangular mating case sections adapted to be secured together to form a boxlike case which can be carried when not in use on a projector, said first case adapted to be positioned adjacent one side of the projector and having means forming a first hopper for receiving a stack of slides to be viewed, said second case section adapted to be positioned adjacent the other side of the projector and having means forming a second hopper, means connecting said first and second case sections is spaced relation means for adjusting said connecting means to vary the spacing between said first and second case sections for selectively mounting said changer on various projectors of different widths, a feed member, means supporting said feed member for reciprocating movement between a retracted position relative to said first hopper means and an extended position relative said first hopper means, a drive member positioned below said feed member, means connecting said feed member to said drive member, a motor connected to drive said drive member for reciprocating said feed member, and control means for actuating said motor for successively transferring the slides from said first hopper means to a viewing position on said projector and then to said second hopper means in response to reciprocating movement of said feed member.
Claim 2
Dependent Claim
238 words
An improved slide changer for use as an attachment on an overhead slide projector having two opposed sides, comprising first and second generally rectangular mating case sections adapted to be secured together to form a boxlike case which can be carried when not in use on a projector, said first case adapted to be positioned adjacent one side of the projector and having means forming a first hopper for receiving a stack of slides to be viewed, said second case section adapted to be positioned adjacent the other side of the projector and having means forming a second hopper, means connecting said first and second case sections is spaced relation means for adjusting said connecting means to vary the spacing between said first and second case sections for selectively mounting said changer on various projectors of different widths, a feed member, means supporting said feed member for reciprocating movement between a retracted position relative to said first hopper means and an extended position relative said first hopper means, a drive member positioned below said feed member, means connecting said feed member to said drive member, a motor connected to drive said drive member for reciprocating said feed member, and control means for actuating said motor for successively transferring the slides from said first hopper means to a viewing position on said projector and then to said second hopper means in response to reciprocating movement of said feed member.
Claim 3
Dependent Claim
82 words
A slide changer as defined in claim 1 wherein said drive member comprises an endless belt, a set of spaced pulleys positioned under said first hopper means and receiving said belt, a set of limit switches positioned to be actuated in response to movement of said feed member, said motor being reversible and being coNnected to one of said pulleys, and circuit means including a relay connecting said limit switches to said motor to effect said reciprocating movement of said feed member.
Claim 4
Dependent Claim
48 words
A slide changer as defined in claim 1 wherein said connecting means comprise parallel spaced arms, pivot means connecting one end portion of each said arm to one of said case sections, and said adjusting means provides for sliding said arms relative to the other said case section.
Claim 5
Dependent Claim
52 words
A slide changer as defined in claim 1 wherein said means supporting said feed member comprise an intermediate panel secured to one of said case sections, wall means projecting upwardly from said panel and cooperating therewith to form a hopper, and said feed member and said motor being positioned below said panel.
Claim 6
Dependent Claim
106 words
An improved slide changer for use as an attachment on an overhead slide projector, comprising a pair of mating boxlike case sections, parallel spaced arms each having one end portion pivotally connected to one of said case sections and being slidably attached to the other said case section to provide for selectively mounting said changer in straddling relation on various projectors of different widths, means forming a hopper on one of said case sections for receiving a stack of slides to be viewed, and means for successively feeding the slides from the bottom of said hopper across said projector and into the other said case section.
Claim 7
Dependent Claim
106 words
An improved slide changer for use as an attachment on an overhead slide projector, comprising a pair of mating boxlike case sections, parallel spaced arms each having one end portion pivotally connected to one of said case sections and being slidably attached to the other said case section to provide for selectively mounting said changer in straddling relation on various projectors of different widths, means forming a hopper on one of said case sections for receiving a stack of slides to be viewed, and means for successively feeding the slides from the bottom of said hopper across said projector and into the other said case section.
Claim 8
Dependent Claim
52 words
A slide changer as defined in claim 5 wherein said feeding means include a feed member supported for reciprocating movement adjacent the bottom of said hopper, an endless flexible belt positioned below said feed member and connected thereto, a motor connected to drive said belt, and control means for actuating said motor.
Claim 9
Dependent Claim
46 words
A slide changer as defined in claim 6 wherein said motor is reversible, and said control means is effective to operate said motor in one direction for a predetermined time and then in the opposite direction to effect automatic extension and retraction of said feed member.
Claim 10
Dependent Claim
215 words
An improved slide changer for use on an overhead slide projector having two opposed sides, comprising first hopper means adapted to be positioned adjacent one side of the projector for receiving a stack of slides to be viewed and including a generally flat horizontal panel, means mounted on the upper surface of said panel for defining a hopper chamber, second hopper means adapted to be positioned adjacent the other side of the projector and adapted to receive the slides after they are viewed, means connecting said first and second hopper means and adapted to mount on said projector, a feed member slidably supported on the upper surface of said panel for reciprocating movement between a retracted position and an extended position relative to the bottom of said hopper chamber, a flexible drive belt, means mounted on the underneath surface of said panel and supporting said belt, means connecting said belt to said feed member, a reversible motor mounted on the underneath surface of said panel and connected to drive said belt for reciprocating said feed member, and control means for selectively reversing said motor for successively transferring the slides from said hopper to a viewing position on said projector and then to said second hopper means in response to reciprocating movement of said feed member.
Claim 11
Dependent Claim
215 words
An improved slide changer for use on an overhead slide projector having two opposed sides, comprising first hopper means adapted to be positioned adjacent one side of the projector for receiving a stack of slides to be viewed and including a generally flat horizontal panel, means mounted on the upper surface of said panel for defining a hopper chamber, second hopper means adapted to be positioned adjacent the other side of the projector and adapted to receive the slides after they are viewed, means connecting said first and second hopper means and adapted to mount on said projector, a feed member slidably supported on the upper surface of said panel for reciprocating movement between a retracted position and an extended position relative to the bottom of said hopper chamber, a flexible drive belt, means mounted on the underneath surface of said panel and supporting said belt, means connecting said belt to said feed member, a reversible motor mounted on the underneath surface of said panel and connected to drive said belt for reciprocating said feed member, and control means for selectively reversing said motor for successively transferring the slides from said hopper to a viewing position on said projector and then to said second hopper means in response to reciprocating movement of said feed member.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |