Abstract: A model baseplate made of plastic for producing a dental working model has cutouts for receiving fastening elements, each having two recess-like bearing regions which are located opposite one another transversely to the direction of the maxillary arch, extend away from one another from the bottom towards the top, and are in each case bounded laterally by two bearing faces which extend away from one another towards the center of the cutout. The fastening elements, produced in one piece from stainless steel, each have two rigid limbs which are connected so as to be elastically pivotable by means of an intermediate piece, attached respectively at a distance from their ends, and have contact regions with contact faces on the outer sides for contact with the bearing regions. The limbs extend away from one another from the bottom towards the top corresponding to the bearing regions and enclose an angle of about 10.degree..

Abstract: A ceramic blank body (2) of a blank (1) is glued on the base (4) of a support (3) of aluminum, which support bears an anchoring part on the side facing away from the blank body (2). According to the invention, the anchoring part is designed as a conical pin (6) which is rotationally symmetrical about a support axis (5). It has a circular engagement groove (7). The base (4) is provided with a bore (8) parallel to the support axis (5). For working the blank, the pin (6) is introduced into a receiving opening (10) of a holding device (9) as far as the limit stop, which is produced by the conical circumferential surface of the pin (6) coming into contact with the analogously conical periphery of the receiving opening (10), and is secured by means of a ball (11) projecting into the engagement groove (7) under the action of an elastic ring (12). A securing pin (13) projects into the bore (8) of the base (4) in order to secure the blank (1) against turning.

Abstract: A moulding is contacted by two end pieces of a rotatable first holding part and is scanned by a disk.For the suppression of relatively large elastic deformations of the moulding by the pressure exerted by the disk, the moulding is also contacted by a second holding part which is located opposite the first holding part, extends into two tips and is mounted so as to be rotatable. For allowing an uninterrupted scanning, the disk is provided with a radial slot which, when the surroundings of the area contacted by the second holding part are scanned, receives said second holding part.The scanning device can be used for the direct copying of the moulding, rotations of the first holding part being transmitted via bevel gears and a shaft to a fastening bearing a blank and a rotating grinding disk of the same dimension as the disk being moved analogously to said disk.

Abstract: The apparatus has a copying mechanism (1), which is mounted in a support fork (2) and comprises a feeler (17) and a toolholder (20). The copying mechanism (1) is supported on a support fork (2), which is arranged swivellably and displaceably on a foundation body. With the copying mechanism (1) is associated a rocker (3), which carries a pattern station (4) and a fabricated part station (5). On the stations (4, 5) are synchronously and rotatably mounted a pattern (24) and a fabricated part (25). Due to the fact that with the pattern (24) and the fabricated part (25) are associated two movement axes, namely axis (26) and the rocker swivel axis (23), it is possible to sense patterns having a random three-dimensional shape and corresponding fabricated parts can be copied.

Abstract: A disc tumbler cylinder lock wherein the cylinder has transverse slots for frame-like tumblers having enlarged portions normally extending into the case for the cylinder under the action of springs to thus prevent rotation of the cylinder except on insertion of a proper key which retracts the tumblers into the cylinder. The enlarged portions are wedges which form part of U-shaped or Z-shaped sections of the frames.