US 4,842,454 AGranted

Method and an arrangement for the preparation of insert bodies for the artificial rebuilding of teeth and human limbs, etc.

OwnerAxel G. V. Gustavsson, Knut M. G. Andersson +1inventors

InventorsAxel G. V. Gustavsson, Knut M. G. Andersson, Karl E. M. Andersson

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Abstract

An arrangement is used for the efficient mass production of individual bodies for the artificial rebuilding of teeth, for example. The arrangement comprises a first pair of co-rotating elements, of which the first element (1) is so arranged as to support a replica (21) of a body which is to be produced, and the second element (2) is so arranged as to support a blank from which the body is to be produced. The replica and the blank are caused to rotate synchronously about the axis of rotation (3, 4) of the respective element. In a second pair of elements a third element supports a sensing device (31) which is capable of interacting with the external contour of the replica, and a fourth element supports a tool (52) by means of which the blank is capable of being machined. The first and second pairs of elements are capable of being displaced relative to one another. The fourth element is adjustably connected to the third element (29) in such a way that the tool executes movements which correspond to the shape of the external contour of the replica sensed by the sensing device (31).

Claims10

Dependent claims

A method for the production of bodies for the artificial rebuilding of teeth, human limbs or similar three-dimensional bodies having external contours with individual characteristic features, comprising the steps of:

securing a replica of a body which is to be produced to a first element which, together with a second element, form a first pair of elements which are capable of co-rotating,
securing a blank from which the body is to be produced to the second element;
causing the first and second elements to co-rotate in such a way that the replica and the blank rotate about the axes of rotation of the respective elements;
providing a second pair of elements which includes a third element for supporting a sensing device which is capable of interacting with the external contour of the replica, and a fourth element which supports a tool by means of which the blank is being worked on, with the first and second pairs of elements being displaceable relative to one another;
controlling said fourth element by the third element in such a way that the tool executes movements which correspond to the shape of the external contour of the replica sensed by the sensing device;
wherein
said sensing device includes a component member movable with respect to a frame of said third element for longitudinal displacement of said component member, said third element further supporting a servo system, by means of which the fourth element and the tool are controlled by the third element for interacting with the blank;
and
wherein the servo system includes a fluid piston which is acted upon on either side by fluid pressure, and said longitudinally displaceable component member is so arranged, as to regulate, depending on the variation in the longitudinal displacement, a first variable constriction in the fluid piston, which together with a fixed constriction, provides variation of the fluid pressure acting on one side of the piston, such that a differential pressure is created across the fluid piston, producing a corresponding displacement of the fluid piston.

6 more elements

An arrangement for production of insert bodies for the artificial rebuilding of teeth, human limbs, or similar three-dimensional bodies having external contours with individual characteristic features, comprising:

a first pair of co-rotating elements including a first element for supporting a replica of a body which is to be produced, and a second element for supporting a blank from which the body is to be produced, the replica and the body being rotatable about the axes of rotation of the respective elements;
and
a second pair of elements including a third element which supports a sensing device capable of interacting with the external contour of the replica, and a fourth element supporting tool by means of which the blank is being worked on, said first and second pairs of elements being displaceable relative to one another, said fourth element being controlled by said third element in such a way that the tool executes movements which correspond to the shape of the external contour of the replica sensed by the sensing device,
said sensing device including a component member movable with respect to a frame of said third element for longitudinal displacement of said component member, said third element further supporting a servo system, by means of which the fourth element and the tool are controlled by the third element for interacting with the blank;
and
wherein the servo system includes a fluid piston which is acted upon on either side by fluid pressure, and said longitudinally displaceable component part is so arranged as to regulate, depending on the variation in the longitudinal displacement, a first variable constriction in the fluid piston, which together with a fixed constriction, provides variation of the fluid pressure acting on one side of the piston, such that a differential pressure is created across the fluid piston, producing a corresponding displacement of the fluid piston.

3 more elements

Dependencies are inferred from the claim text.