Patent US3870889A successfully refreshed from Google Patents.
US3870889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film sheet cassette
Assignee: PRODUCTION Inc
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Filing: 1973-12-26
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Granted: 1975-03-11
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Expires: 1993-12-26
Abstract
Abstract A film sheet cassette useful in medical X-ray applications and particularly in daylight film handling systems which include a dispenser for dispensing film sheets one at a time into the cassette. In use, the loaded cassette is first exposed to an Xray source to photograph a patient after which it may be positioned in operative relationship with respect to a film processor for releasing the exposed film sheet into the processor. The cassette is comprised of a housing including a back plate and a dover plate fixed thereto in parallel spaced relationship. The back plate is provided with a raised elongated rib in the center thereof and strips of compressible material affixed to the back plate adjacent to its side edges. Disposed between the back plate and cover plate are a flexible back screen plate adjacent to the back plate and a flexible pressure screen plate adjacent to the cover plate. The cassette housing defines channels along opposite edges thereof for receiving spring urged cam rods slidable between a first closed position and a second open position. The pressure screen plate is provided with follower studs along the edges thereof which ride on cam surfaces of the rods. Actuating pins are provided on both the dispenser and processor for protruding into the channels when the cassette is positioned in operative light tight relationship with respect thereto. The pins engage the cam rods to slide them within the channels from said first to said second position thus causing the cam surfaces to lift the follower studs and space the pressure screen plate from the back screen plate to thus allow film sheets to enter or exit from the cassette. Withdrawal of the pins permits the cam rods to return to the first position thus forcing the studs toward the back plate and bowing both screen plates about the back plate rib to thereby assure excellent film/screen contact.
Inventors
- 👤 Gunter Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:04
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
A film sheet cassette comprising: a back plate and cover plate fixed in spaced substantially parallel relationship; raised elongated means disposed on said back plate projecting toward said cover plate; a resilient back screen plate disposed between said back plate and cover plate; a resilient pressure screen plate disposed between said back screen plate and cover plate; and actuatable means supported in said cassette for moving said pressure screen plate between an open first position spaced from said back screen plate and a closed second position engaging said back screen plate and deforming both said back screen plate and said pressure screen plate around said raised means.
Claim 2
Dependent Claim
107 words
A film sheet cassette comprising: a back plate and cover plate fixed in spaced substantially parallel relationship; raised elongated means disposed on said back plate projecting toward said cover plate; a resilient back screen plate disposed between said back plate and cover plate; a resilient pressure screen plate disposed between said back screen plate and cover plate; and actuatable means supported in said cassette for moving said pressure screen plate between an open first position spaced from said back screen plate and a closed second position engaging said back screen plate and deforming both said back screen plate and said pressure screen plate around said raised means.
Claim 3
Dependent Claim
107 words
A film sheet cassette comprising: a back plate and cover plate fixed in spaced substantially parallel relationship; raised elongated means disposed on said back plate projecting toward said cover plate; a resilient back screen plate disposed between said back plate and cover plate; a resilient pressure screen plate disposed between said back screen plate and cover plate; and actuatable means supported in said cassette for moving said pressure screen plate between an open first position spaced from said back screen plate and a closed second position engaging said back screen plate and deforming both said back screen plate and said pressure screen plate around said raised means.
Claim 4
Dependent Claim
107 words
A film sheet cassette comprising: a back plate and cover plate fixed in spaced substantially parallel relationship; raised elongated means disposed on said back plate projecting toward said cover plate; a resilient back screen plate disposed between said back plate and cover plate; a resilient pressure screen plate disposed between said back screen plate and cover plate; and actuatable means supported in said cassette for moving said pressure screen plate between an open first position spaced from said back screen plate and a closed second position engaging said back screen plate and deforming both said back screen plate and said pressure screen plate around said raised means.
Claim 5
Dependent Claim
43 words
The cassette of claim 1 wherein said raised elongated means is disposed substantially along a center line of said back plate; and further including resilient elongated pad means on said back plate extending substantially parallel to and spaced from said raised elongated means.
Claim 6
Dependent Claim
32 words
The cassette of claim 1 wherein said back plate comprises a metal panel; and wherein said metal panel is deformed substantially along a center line thereof to define said raised elongated means.
Claim 7
Dependent Claim
41 words
The cassette of claim 1 wherein said back screen plate comprises a flexible panel of low X-ray energy absorbing material; and further including a layer of X-ray intensifying screen material adhered to said flexible panel opposed to said pressure screen plate.
Claim 8
Dependent Claim
37 words
The cassette of claim 1 wherein said pressure scrEen plate comprises a flexible metal panel; and further including a layer of X-ray intensifying screen material supported on said flexible metal panel opposed to said back screen plate.
Claim 9
Dependent Claim
20 words
The cassette of claim 5 including a layer of lead interposed between said screen material and said flexible metal panel.
Claim 10
Dependent Claim
95 words
The cassette of claim 1 wherein said actuatable means includes: cam follower means secured to the side edges of said pressure screen plate; cam rod means respectively mounted adjacent said side edges of said pressure screen plate for linear movement between first and second positions; said cam rod means having cam surfaces engaged with said cam follower means, said cam surfaces being shaped to move said cam follower means away from said back plate to define said open first position as said cam rod means is linearly moved from said first toward said second position.
Claim 11
Dependent Claim
39 words
The cassette of claim 7 including spring means normally urging said cam rod means to said first position to cause said cam surfaces to move said cam follower means toward said back plate to define said closed second position.
Claim 12
Dependent Claim
328 words
A film sheet cassette comprising: a substantially rectangular frame including a back plate and a cover plate and side members interconnecting said back and cover plates in spaced parallel relationship; a resilient back screen plate disposed between said back plate and cover plate for limited movement toward and away from said back plate; a resilient pressure screen plate disposed between said back screen plate and cover plate for limited movement toward and away from said back plate; raised elongated means formed on said back plate and projecting toward said cover plate; first and second cam follower means secured to said pressure screen plate; first and second elongated channels defined in said frame; first and second cam rods respectively disposed in said first and second channels, for linear movement therein between first and second positions; said first and second cam rods each having cam surface means respectively engaged with said first and second cam follower means, said cam surface means being shaped to move said cam follower means away from said back plate as said cam rods are linearly moved in said channels from said first toward said second positions; spring means normally urging said cam rod means to said first position to move said cam follower means toward said back plate and deform both said back screen plate and said pressure screen plate around said raised elongated means; first and second openings in said frame respectively communicating with said first and second channels for receiving pins therethrough for engaging and linearly moving said first and second cam rods; a film sheet entrance opening defined by said frame substantially aligned with the boundary between said back screen plate and pressure screen plate; and light shield means disposed adjacent to one edge of said back plate in alignment with said film sheet entrance opening for preventing the passage of light into and between said back screen plate and pressure screen plate when said cam rods are in said first position.
Claim 13
Dependent Claim
328 words
A film sheet cassette comprising: a substantially rectangular frame including a back plate and a cover plate and side members interconnecting said back and cover plates in spaced parallel relationship; a resilient back screen plate disposed between said back plate and cover plate for limited movement toward and away from said back plate; a resilient pressure screen plate disposed between said back screen plate and cover plate for limited movement toward and away from said back plate; raised elongated means formed on said back plate and projecting toward said cover plate; first and second cam follower means secured to said pressure screen plate; first and second elongated channels defined in said frame; first and second cam rods respectively disposed in said first and second channels, for linear movement therein between first and second positions; said first and second cam rods each having cam surface means respectively engaged with said first and second cam follower means, said cam surface means being shaped to move said cam follower means away from said back plate as said cam rods are linearly moved in said channels from said first toward said second positions; spring means normally urging said cam rod means to said first position to move said cam follower means toward said back plate and deform both said back screen plate and said pressure screen plate around said raised elongated means; first and second openings in said frame respectively communicating with said first and second channels for receiving pins therethrough for engaging and linearly moving said first and second cam rods; a film sheet entrance opening defined by said frame substantially aligned with the boundary between said back screen plate and pressure screen plate; and light shield means disposed adjacent to one edge of said back plate in alignment with said film sheet entrance opening for preventing the passage of light into and between said back screen plate and pressure screen plate when said cam rods are in said first position.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |