US3759487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stacked mixed slide gate mechanism
Assignee: Bell and Howell Co
•
Filing: 1971-05-10
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Granted: 1973-09-18
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Expires: 1991-05-10
Abstract
Abstract A stacked mixed slide gate mechanism for use in a slide projector to allow the projector to move slides of varying thicknesses through the projection axis is described. The slides are stacked in a slide supply tray and received by a slide storage tray. The slides are ''''pressed'''' against the front of each tray by a spring-pressure pad arrangement. Located adjacent to the front of each tray is a moveable gate. In normal operation, the gate is spaced from the slide movement path by a predetermined amount sufficient to allow a ''''thin'''' slide to pass while preventing the next slide from passing. When a ''''thick'''' slide is to be moved, the moveable gate opens to a detent position. The gate becomes locked in this position and allows the thick slide to pass without the gate rubbing on the photographic surface of the slide. When the slide movement mechanism returns to pick up the next slide, it returns the gate to the ''''normal'''' or thin slide position.
Inventors
- 👤 F Badalich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
G; G03; G03B; G03B23/00; G03B23/02; G03B23/04; G03B23/046
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
263 words
A stacked mixed slide gate mechanism suitable for use in a slide projector wherein slides are moved along a slide transfer path from a first slide tray located on one side of a projection axis to a second slide tray located on the other side of a projection axis by a slide moving mechanism and vice versa, depending upon the mode of operation, said stacked mixed slide gate mechanism being adapted to prevent the entry of more than one slide into the slide transfer path from either slide tray while allowing slides of varying thicknesses to enter the slide transfer path and pass into the other tray, said stacked mixed slide gate mechanism comprising: a first gate arm mounted in said slide projector in front of said first slide tray so as to be associated there-with, and between said first slide tray and said slide transfer path; a second gate arm mounted in said slide projector in front of said second slide tray so as to be associated there-with, and between said second slide tray and said slide transfer path; and, a gate control means coupled to said first and second gate arms to hold one of said gate arms in a first pre-determined position that allows a single slide of predetermined thickness to leave its associated slide tray and move into said slide transfer path while preventing further slides from leaving said associated slide tray, and to hold the other of said gate arms in a second predetermined position that allows a slide of any thickness to enter its associated slide tray.
Claim 2
Dependent Claim
263 words
A stacked mixed slide gate mechanism suitable for use in a slide projector wherein slides are moved along a slide transfer path from a first slide tray located on one side of a projection axis to a second slide tray located on the other side of a projection axis by a slide moving mechanism and vice versa, depending upon the mode of operation, said stacked mixed slide gate mechanism being adapted to prevent the entry of more than one slide into the slide transfer path from either slide tray while allowing slides of varying thicknesses to enter the slide transfer path and pass into the other tray, said stacked mixed slide gate mechanism comprising: a first gate arm mounted in said slide projector in front of said first slide tray so as to be associated there-with, and between said first slide tray and said slide transfer path; a second gate arm mounted in said slide projector in front of said second slide tray so as to be associated there-with, and between said second slide tray and said slide transfer path; and, a gate control means coupled to said first and second gate arms to hold one of said gate arms in a first pre-determined position that allows a single slide of predetermined thickness to leave its associated slide tray and move into said slide transfer path while preventing further slides from leaving said associated slide tray, and to hold the other of said gate arms in a second predetermined position that allows a slide of any thickness to enter its associated slide tray.
Claim 3
Dependent Claim
53 words
A stacked mixed slide gate mechanism as claimed in claim 1 wherein said gate control means allows said one of said gate arms to move from said first predetermined position when a slide that is thicker than said predetermined thickness is being moved from its associated slide tray into said slide transfer path.
Claim 4
Dependent Claim
105 words
A stacked mixed slide gate mechanism as claimed in claim 2 including first and second lever arms, said first lever arm being associated with said first gate arm and said second lever arm being associated with said second gate arm, the lever arm associated with said one of said gate arms coating with said gate control means so as to return said one of said gate arms to said first predetermined position after said one of said gate arms has been moved from said first predetermined position to allow the passage of a thick slide from its associated slide tray into said slide transfer path.
Claim 5
Dependent Claim
65 words
A stacked mixed slide gate mechanism as claimed in claim 3 wherein the lever arm associated with the other of said gate arms coacts with said gate control means so as to move said other of said gate arms from said first predetermined position to said second predetermined position to allow the entry of slides from said slide transfer path into its associated slide tray.
Claim 6
Dependent Claim
52 words
A stacked mixed slide gate mechanism as claimed in claim 4 wherein said lever arms are L-shaped and wherein one of said L-shaped arms is parallel to said slide transfer path and the other is parallel to its associated slide tray when its associated gate arm is in said first predetermined position.
Claim 7
Dependent Claim
68 words
A stacked mixed slide gate mechanism as claimed in claim 5 wherein said gate control means includes first and second detent mechanisms, said first detent mechanism being associated with said first gate arm and said second detent mechanism being associated with said second gate arm, said detent mechanisms adapted to lock said gate arms in more than one position, said positions including said first and second predetermined positions.
Claim 8
Dependent Claim
39 words
A stacked mixed slide gate mechanism as claimed in claim 6 wherein each of said detent mechanisms comprises a spring-ball arrangement and a plurality of apertures formed in a plate, said plate being fixedly mounted in said slide projector.
Claim 9
Dependent Claim
82 words
A stacked mixed slide gate mechanism as claimed in claim 7 including means mounted in said slide projector for movement with the slide transfer mechanism of said slide projector that returns said one of said gate arms to said first predetermined position by impinging on its associated lever arm after said gate arm has been moved from said first predetermined position by a slide that is thicker than said predetermined thickness moving from its associated slide tray into said slide transfer path.
Claim 10
Dependent Claim
58 words
A stacked mixed slide gate mechanism as claimed in claim 8 wherein said slide projector includes means that causes said lever arms to coact with said gate control means and move said gate arms from said first predetermined position to said second predetermined position to allow slides from said slide transfer path to enter their associated slide trays.
Claim 11
Dependent Claim
52 words
A stacked mixed slide gate mechanism as claimed in claim 3 wherein said lever arms are L-shaped and wherein one of said L-shaped arms is parallel to said slide transfer path and the other is parallel to its associated slide tray when its associated gate arm is in said first predetermined position.
Claim 12
Dependent Claim
82 words
A stacked mixed slide gate mechanism as claimed in claim 10 including means mounted in said slide projector for movement with the slide transfer mechanism of said slide projector that returns said one of said gate arms to said first predetermined position by impinging on its associated lever arm after said gate arm has been moved from said first predetermined position by a slide that is thicker than said predetermined thickness moving from its associated slide tray into said slide transfer path.
Claim 13
Dependent Claim
68 words
A stacked mixed slide gate mechanism as claimed in claim 1 wherein said gate control means includes first and second detent mechanisms, said first detent mechanism being associated with said first gate arm and said second detent mechanism being associated with said second gate arm, said detent mechanisms adapted to lock said gate arms in more than one position, said positions including said first and second predetermined positions.
References Cited (Backward Citations)
US2260660A
Cited
US2583442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |