Patent US3784835A successfully refreshed from Google Patents.
US3784835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film sheet cassette
Assignee: Productron Inc
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Filing: 1972-02-14
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Granted: 1974-01-08
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Expires: 1992-02-14
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 cover plate fixed thereto in parallel spaced relationship. A pressure plate is disposed between the back plate and cover plate and spring urged against the back plate in light tight relationship therewith. The cassette housing defines channels along opposite edges thereof for slidably receiving cam rods. The pressure 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 and slide them within the channels thus causing the cam surfaces to lift the follower studs and space the pressure plate from the back plate to thus allow film sheets to enter or exit from the cassette.
Inventors
- 👤 G Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:59
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/04; G03B42/045; G03B17/00; G03B17/26; G03B21/00; G03B21/54; G03B21/64
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
249 words
A film sheet cassette comprising: a substantially rectangular frame including a back plate and a cover plate and side walls interconnecting said back and cover plates in spaced parallel relationship; means carried by said frame including a pressure plate disposed between said back and cover plates for resiliently bearing against said back plate, said pressure plate including at least first and second cam follower means secured thereto; 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; 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 plate and pressure 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 plate and pressure plate when said cam rods are in said first position.
Claim 2
Dependent Claim
249 words
A film sheet cassette comprising: a substantially rectangular frame including a back plate and a cover plate and side walls interconnecting said back and cover plates in spaced parallel relationship; means carried by said frame including a pressure plate disposed between said back and cover plates for resiliently bearing against said back plate, said pressure plate including at least first and second cam follower means secured thereto; 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; 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 plate and pressure 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 plate and pressure plate when said cam rods are in said first position.
Claim 3
Dependent Claim
43 words
The film sheet cassette of claim 1 wherein said light shield means includes a flexible sealing member secured to said back plate adjacent said one edge thereof; and flange means extending substantially perpendicularly from said pressure plate for projecting into said sealing member.
Claim 4
Dependent Claim
20 words
The film sheet cassette of Claim 1 wherein said pressure plate is flexible and resiliently bowed along the length thereof.
Claim 5
Dependent Claim
114 words
The film sheet cassette of claim 3 wherein said pressure plate has first and second side edges and wherein said first and second cam follower means each includes upper, middle and lower cam followers secured to said pressure plate along each of said side edges; and wherein said first and second cam rods each has upper and lower cam surfaces for respectively bearing against said upper and lower cam followers to urge them toward said back plate when said cam rod is in said first position and middle cam surfaces for bearing against said middle cam followers to urge them away from said back plate when said cam rod is in said second position.
Claim 6
Dependent Claim
53 words
The film sheet cassette of claim 4 including spring means normally urging said first and second cam rods to said first position and wherein said first and second openings are positioned relative to said channels so that pins engaging said cam rods through said openings will move said rods to said second position.
Claim 7
Dependent Claim
39 words
The film sheet cassette of claim 5 wherein said pressure plate is substantially flat and rigid and wherein said spring means includes at least one spring member resiliently urging said pressure plate into flat engagement with said back plate.
Claim 8
Dependent Claim
26 words
The film sheet cassette of claim 1 wherein said pressure plate is flexible; and including means for bowing said pressure platealong the length thereof. plate along
Claim 9
Dependent Claim
33 words
The film sheet cassette of claim 7 wherein said means for bowing said pressure plate includes at least one adjustable length tie bar means secured between the side edges of said pressure plate.
Claim 10
Dependent Claim
71 words
The film sheet cassette of claim 8 wherein said means for bowing said pressure plate includes upper middle and lower tie bar means each including an elongated central member having oppositely threaded end portions; and means coupling the end portions of each of said central members to opposite first and second side edges of said pressure plate for drawing said side edges toward one another as said central member is rotated.
Claim 11
Dependent Claim
38 words
The film sheet cassette of claim 9 wherein said first and second cam follower means includes studs terminally coupled to said tie bar means and extending beyond said first and second side edges of said pressure plate, respectively.
Claim 12
Dependent Claim
27 words
The film sheet cassette of claim 1 including externally visible indicator means for indicating the presence of a film sheet between said pressure plate and back plate.
Claim 13
Dependent Claim
56 words
The film sheet cassette of claim 11 wherein said indicator means includes an opening in said side wall; and pin means supported for movement in said side wall opening, said pin means including a portion thereof disposed adjacent to an edge of said pressure plate and back plate for engagement by a film sheet present therebetween.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |