Patent US3976886A successfully refreshed from Google Patents.
US3976886A
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US
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Apparatus for effecting a simultaneous multiple tomography
Assignee: Individual
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Filing: 1975-11-06
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Granted: 1976-08-24
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Expires: 1995-11-06
Abstract
Abstract In order to impart to film-screens assemblies homothetic relative sliding with respect to each other which are required for obtaining six tomographic sections, the upper film-screen assembly support is coupled to a driving spring whose end is connected to a transmission leading to the input member of a regulating device. The latter is constituted by two single-acting jacks whose chambers intercommunicate, in the direction of the travel for operation of the apparatus, through an adjustable constriction and, in the return direction, through a check-valve. In the armed position, the rod of one of the jacks, is retained by a locking device. The travel of the film-screens assemblies corresponding to the tomographic sweep, is initiated by the emission of X-rays through the electromagnet. The return travel, which places the apparatus in the armed position, is ensured by means of a key constituting a winding means. The constant speed of displacement of the films is regulated by a knob and a selector knob regulates the symmetry.
Inventors
- 👤 Pierre Landau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:25
CPC Classifications
G; G03; G03B; G03B42/00; G03B42/02; G03B42/04; A; A61; A61B; A61B6/00; A61B6/02; A61B6/54; A61B6/548
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
266 words
In a simultaneous multiple tomography apparatus comprising a cassette adapted to be inserted in a case having a anti-diffusion grid, or Potter, of a table of a radiologic unit, and, disposed inside the cassette, a stack of thin assemblies of films and reinforcing screens, a lever pivotable relative to the cassette, each film-screens assembly having connected thereto a support, the pivotal lever being pivoted to the supports to interconnect the supports, the lever being capable of effecting, under the effect of a rectilinear travel of the Potter which is synchronized with a sweep travel of a radiogenic source of the radiolic unit, an angular movement under the effect of which movement the film-screens assemblies undergo relative rectilinear travels proportional to the travel of the Potter relative to the table; the improvement comprising: a driving device connected to one of the supports, termed a pilot-support, and capable of imparting thereto a rectilinear travel at constant speed between an initial position and a final position of the pilot-support in an operative travel of the film-screens assemblies in operation of the apparatus; a locking device having an inoperative position and an operative position in which operative position it is capable of retaining the pilot-support in said initial position; an actuating device controllable by the movement of the radiogenic source and cooperative with the locking device under such conditions that, at the moment when X-rays are emitted during the tomographic sweep travel, the locking device is rendered inoperative and the pilot-support is released whereby under the effect of the driving device the film-screens assemblies effect the required relative differential travels.
Claim 2
Dependent Claim
266 words
In a simultaneous multiple tomography apparatus comprising a cassette adapted to be inserted in a case having a anti-diffusion grid, or Potter, of a table of a radiologic unit, and, disposed inside the cassette, a stack of thin assemblies of films and reinforcing screens, a lever pivotable relative to the cassette, each film-screens assembly having connected thereto a support, the pivotal lever being pivoted to the supports to interconnect the supports, the lever being capable of effecting, under the effect of a rectilinear travel of the Potter which is synchronized with a sweep travel of a radiogenic source of the radiolic unit, an angular movement under the effect of which movement the film-screens assemblies undergo relative rectilinear travels proportional to the travel of the Potter relative to the table; the improvement comprising: a driving device connected to one of the supports, termed a pilot-support, and capable of imparting thereto a rectilinear travel at constant speed between an initial position and a final position of the pilot-support in an operative travel of the film-screens assemblies in operation of the apparatus; a locking device having an inoperative position and an operative position in which operative position it is capable of retaining the pilot-support in said initial position; an actuating device controllable by the movement of the radiogenic source and cooperative with the locking device under such conditions that, at the moment when X-rays are emitted during the tomographic sweep travel, the locking device is rendered inoperative and the pilot-support is released whereby under the effect of the driving device the film-screens assemblies effect the required relative differential travels.
Claim 3
Dependent Claim
61 words
An apparatus as claimed in claim 1, wherein the driving device comprises a driving means which has a rectilinear travel which exerts on the pilot-support a force to shift the pilot-support in a direction toward said final position in an operative travel, a regulating device being combined with the driving means for ensuring that the driving means travels at constant speed.
Claim 4
Dependent Claim
32 words
An apparatus as claimed in claim 2, wherein the driving means is an extensible elastically yieldable element having one end connected to the cassette and an opposite end connected to the pilot-support.
Claim 5
Dependent Claim
20 words
An apparatus as claimed in claim 3, wherein the elastically yieldable element is a tension coil spring constantly under tension.
Claim 6
Dependent Claim
28 words
An apparatus as claimed in claim 2, wherein a flexible transmission connects the regulating device to the end of the driving means which is connected to the pilot-support.
Claim 7
Dependent Claim
65 words
An apparatus as claimed in claim 2, wherein the regulating device comprises two single-acting hydraulic jacks having rods and work chambers, two conduits disposed in parallel interconnecting the work chambers, one conduit having an adjustable constriction and the other having a check-valve which is capable of closing when the pressure is exerted in the work chamber of one of the jacks, termed a primary jack.
Claim 8
Dependent Claim
73 words
An apparatus as claimed in claim 6, wherein a flexible transmission connects the regulating device to the end of the driving means which is connected to the pilot-support and the primary jack rod is connected to the end of said transmission opposed to the end thereof connected to the driving means and cooperates with the locking device which is capable of retaining, in its operative position, said rod in an initial armed position.
Claim 9
Dependent Claim
76 words
An apparatus as claimed in claim 7, wherein, for the inoperative position of the locking device, the primary jack rod is free to put the corresponding work chamber under pressure under the effect of the pull exerted by the transmission, by closure of the check-valve and the flowing of the hydraulic liquid, in accordance with a predetermined rate of flow through the constriction, and thereby fill the work chamber of the other jack, termed secondary jack.
Claim 10
Dependent Claim
27 words
An apparatus as claimed in claim 6, wherein the constriction is adjustable by a screwthreaded rod having an end in the form of a needle valve member.
Claim 11
Dependent Claim
107 words
An apparatus as claimed in claim 6, comprising a movable locking means which is part of the actuating device for maintaining the locking device in its operative position, the lockinig device comprising two pawls which are pivotable relative to the cassette about two pivot axes and form on one side of the pivot axes branches of a jaw capable of retaining the rod of the primary jack in the initial armed position, and, on the other side of the pivot axes, define a passageway in which is engageable and from which is withdrawable the locking means for respectively precluding and allowing the opening of the jaw branches.
Claim 12
Dependent Claim
25 words
An apparatus as claimed in claim 10, wherein the pawls are subjected to an elastically yieldable means for biasing the jaw branches toward each other.
Claim 13
Dependent Claim
71 words
An apparatus as claimed in claim 11, comprising anchoring means combined with the rod of the primary jack which are cooperable with the branches of the jaw and define surfaces forming a cam adapted to move the branches away in opposition to the elastically yieldable means when the locking means is in its inoperative position under the effect of the displacement of the rod of the primary jack in either direction.
Claim 14
Dependent Claim
32 words
An apparatus as claimed in claim 6, wherein the rods of the two jacks are parallel and carry racks, and a gear pinion meshing with the two racks operatively interconnects the rods.
Claim 15
Dependent Claim
50 words
An apparatus as claimed in claim 13, wherein the pinion is integral with a rotary shaft on which there is fixed drive means for ensuring, after said operative travel of the film-screens assemblies has been effected, the return of the rod of the primary jack to the initial armed position.
Claim 16
Dependent Claim
28 words
An apparatus as claimed in claim 1, comprising a movable locking means which is part of the actuating device for maintaining the locking device in its operative position.
Claim 17
Dependent Claim
23 words
An apparatus as claimed in claim 15, comprising means for elastically biasing the locking means to an operative position of the locking means.
Claim 18
Dependent Claim
78 words
An apparatus as claimed in claim 16, comprising an elastically yieldable member constituting a withdrawable stop on the cassette for retaining the locking means in an inoperative position in opposition to said means elastically biasing the locking means and thereby permitting the return of the primary jack rod to its initial armed position, a control element cooperative with the stop to withdraw the stop at the end of the return travel being connected to the primary jack rod.
Claim 19
Dependent Claim
52 words
An apparatus as claimed in claim 15, comprising an electromagnet having a coil and plunger, the locking means being integral with the plunger of the electromagnet whose energization causes, in succession, the passage of the locking means to its inoperative position and the passage of the locking device to its inoperative position.
Claim 20
Dependent Claim
34 words
An apparatus as claimed in claim 18, wherein a circuit supplies power to the coil of the electromagnet, the circuit being adapted to be controlled by emission of the rays of the radiogenic source.
Claim 21
Dependent Claim
43 words
An apparatus as claimed in claim 1, comprising a mount for carrying the locking device, which mount is movable with respect to the cassette, and means for locking the mount in a selected given position for regulating the initial position of the pilot-support.
Claim 22
Dependent Claim
17 words
An apparatus as claimed in claim 20, comprising selecting means for controlling the movements of the mount.
Claim 23
Dependent Claim
17 words
An apparatus as claimed in claim 21, wherein the selecting means is a rack and pinion arrangement.
Claim 24
Dependent Claim
24 words
An apparatus as claimed in claim 21, wherein a brake is provided for locking the mount in the position defined by the selecting means.
References Cited (Backward Citations)
US3291983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |