Method and apparatus for adjusting mutual position of constructional elements of a patient chair
AssigneePlanmeca Oy
InventorPentti Hyvarinen
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Abstract
The object of the invention is a method and an apparatus for adjusting mutual position of two structural elements of a patient chair, like the back rest and the head rest, articulated with each other, in which method the mutual position of the two structural elements (3, 4, 5) connected with each other by articulation is adjusted by a drive device (13). With the help of the drive device (13) it is possible to produce, for example, an essentially high rotational motion that can be converted to a linear motion with the help of a thread. The linear motion is converted to an essentially slow rotational motion with the help of a thread element (9) functionally connected to an articulated shaft (6, 7) belonging to the position adjustment mechanism.
Claims17
A method for adjusting mutual position of two structural elements of a patient chair, which structural elements are connected to each other by an articulated shaft, in which method said mutual position of said two structural elements is adjusted by a drive device arranged to produce a linear motion, which linear motion is converted to a slow rotational motion of a first thread element arranged in connection with said articulated shaft, wherein said linear motion is produced with the help of the drive device producing rotational motion and of a second thread element which changes the rotational motion to an axial motion on said articulated shaft, wherein an essentially fast rotational motion is produced by said drive device to said second thread element, and wherein said essentially fast rotational motion produced by the drive device is converted to a linear motion of said first thread element in said second thread element by an essentially low-pitched thread element, which linear motion is further converted, in said first thread element and with the help of essentially high-pitched threads on the articulated shaft, to an essentially slow rotational motion of the first thread element.
An apparatus for adjusting mutual position of two structural elements of a patient chair that are articulated with each other, which apparatus comprises an articulated shaft and a drive device, by the drive force of which the mutual positions of the structural elements, joined together by said articulated shaft, have been arranged to be adjusted, wherein said articulated shaft functionally incorporates a first thread element equipped with an essentially high-pitched thread and a machine element equipped with a corresponding thread and being in functional connection with the second of said structural elements, and that said first thread element has been arranged to be moved in axial direction of the articulated shaft with the help of power taken from said drive device.
A method for adjusting mutual position of two structural elements of a patient chair, which structural elements are connected to each other by an articulated shaft, in which method said mutual position of said two structural elements is adjusted by a drive device arranged to produce a linear motion, which linear motion is converted to a slow rotational motion of a first thread element arranged in connection with said articulated shaft, wherein said linear motion is produced with the help of the drive device producing rotational motion and of a second thread element which changes the rotational motion to an axial motion on said articulated shaft, wherein an essentially fast rotational motion is produced by said drive device to said second thread element, and wherein the ratio between said essentially fast and slow rotational motions is of the order of 100:1.
Dependencies are inferred from the claim text.