Chairs and seats – Movable bottom – Interconnected with back for relative concurrent movement
Patent
1985-10-18
1987-10-13
McCall, James T.
Chairs and seats
Movable bottom
Interconnected with back for relative concurrent movement
297241, 297383, 297DIG4, A47C 102
Patent
active
046994254
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a chair assembly for use when taking X-ray pictures comprising a carriage structure fitted with swivel wheels or rollers; a chair mounted on the carriage structure and including first and second guide frames provided with guide means intended for guiding in the horizontal plane the movement of seat components in the direction of X- and Y-coordinates; bearing means for twisting or rotating the guide arms, and therewith said seat components, relative to the carriage structure; locking means for releasably locking the guide frames and the seat members against movement; control means for controlling movement of the chair on the carriage structure and for guiding rotational and coordinate movement of the guide frames; and control means for controlling the locking means for locking and releasing rotational and coordinate movement of the guide frames.
A chair of this kind can be moved, either when occupied by a patient to be X-rayed or when empty, by displacing the chair on the wheeled carriage structure and then setting it in precisely the position desired, by releasing the requisite guide frame locking means and rotating the guide frames and/or moving them in the direction of the X- and Y-coordinates.
Departing from a reference position, the position of the chair can be finely adjusted with the aid of rotational and coordinate scales located on the chair assembly.
A chair of this kind is thus an important piece of equipment when taking X-ray pictures, primarily because it contributes effectively in enabling the X-ray pictures desired to be taken correctly the first time, thereby obviating the need of re-takes and preventing the patient from being exposed to otherwise unnecessary harmful radiation resulting from the re-takes.
BACKGROUND ART
Earlier known chair assemblies of this kind are, inter alia, difficult to handle and manipulate, due partly to the unsatisfactory design and positioning of the control means for controlling chair movement and release of the locking means, and partly to the fact that, in order to ensure that the chair will not topple, the carriage structure is of such wide dimensions that it obstructs the personnel in their efforts to move and adjust the position of the chair.
The carriage structure must be given wide dimensions, because if not there is an acute risk that the seat will topple or tip when seating a patient thereon. It is often necessary to seat severely injured patients or handicapped people in the chair. These patients are often taken from a bed, wheelchair or like device and placed initially on the edge of the chair seat, whereupon the chair would immediately tip forwards if the carriage structure were not dimensioned to prevent this from happening.
The risk of the chair tipping backwards is also to be found when adjusting the setting of the chair relative to the carriage structure in order to take certain kinds of X-ray pictures.
A chair assembly for use when taking X-ray pictures and comprising a carriage structure which is overdimensioned in relation to the chair seat and which impedes the X-ray personnel in their work is found described and illustrated in EPC-A1-0 001 407 (Pfizer Inc.).
Other types of chairs intended for quite different purposes and comprising various arrangements for preventing or permitting toppling or tipping of the chair to a given extent are known to the art.
Examples of such chairs are found described and illustrated in SE-B-204 191 (Berggren), FR-B-2 406 435 (Bonneau), U.S. Pat. No. 1,977,550 (Gibb), U.S. Pat. No. 3,075,810 (Kitsopoulos), U.S. Pat. No. 3,368,845 (Watanabe).
U.S. Pat. No. 2,293,324 (Vladeff) describes a radiography process and apparatus comprising a number of hollow travelling frames which are movable relative to each other.
OBJECT OF THE INVENTION
An object of the present invention is to provide a chair of the aforementioned kind intended for use when taking X-ray pictures which is not encumbered with the disadvantages inherent with known chairs and which can be handled more r
REFERENCES:
patent: 1977550 (1934-10-01), Gibb
patent: 2293324 (1942-08-01), Vladeff
patent: 2613726 (1952-10-01), Paatero
patent: 3075810 (1963-01-01), Kitsopoulos
patent: 3113804 (1963-12-01), Ritter
patent: 3151910 (1964-10-01), Larson
patent: 3368845 (1968-02-01), Watanabe
patent: 4482184 (1984-11-01), Mincey
patent: 4542915 (1985-09-01), Wheeler et al.
patent: 4600239 (1986-07-01), Gerstein
AO Medical Products AB
McCall James T.
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