Patent GB-782403-A (GB)
Title: Devices for the setting, by means of a press, of pieces in correct position inside a drilling in a work piece
IPC: G04D3/04
Filed: 1955-11-28
Abstract: 782,403. Assembling force fits. SCHUTZ, E. Nov. 28, 1955 [Dec. 10, 1954], No. 34038/55. Class 83 (4). Device for setting by means of a press comprising a ram provided with a tool holder, of pieces, e.g. bearing stones, in correct position inside a drilling in a workpiece, comprises a bearing plate adapted to support the said workpiece and carried by a table of the press by the intermediary of a compensating device, and a device for guiding said bearing plate with respect to said table arranged so as to allow small angular displacements of the plate necessary for the under face of said toolholder to be disposed parallel to a reference plane defined by at least one bearing face on the workpiece and to be in contact simultaneously with all of said bearing face or faces. In an embodiment the workpiece 2 rests on a plate 1 supported on three springs 3 symmetrically disposed around the longitudinal axis of the ram 4 which carries the tool holder 11. The plate is provided with a retractable spring-loaded centring finger 5 which enters the drilling 6 in the workpiece. The plate has a guide member 12 the cylindrical portion b of which enters a guide bore 13 in the press table. In operation the workpiece 2 is placed on the plate 1 with the guide finger in the drilling 6. A bearing stone 7 is set on the protruding end of the finger 5 and the ram 4 is lowered to enable the punch 8 to force the bearing stone into the drilling 6 until the under face 9 of the tool holder engages the machined surfaces of the workpiece, and correctly orientates the workpiece to ensure accurate fitting of the stone relatively to the said machined surfaces. In another embodiment fluid pressure pistons 16 (Fig. 3) take the place of the springs 3 or a single spring 19 (Fig. 4) may be used. In a further embodiment the plate 1 has a cylindrical centring rod 20 which engages a guide 21 in an intermediate member consisting of a table 22 and a cylindrical portion 23 slidable in a sleeve 24 fastened to the press frame. The cylindrical portion 23 of the intermediate member carries a sleeve 27 provided with a conical end part 30 which co-operates with a conical end part 26 on the sleeve 24. Springs 31 acting on the table 22 hold the conical parts together. In operation, with the ram 4 raised, the conical portions ensure an automatic centring of the intermediate member and thus the plate 1 carrying the workpiece. Downward movement of the ram pushes back the workpiece against the action of springs 31 and disengages the conical parts 26, 30 to enable the intermediate member to take any desired inclination so that when the punch reaches its lowest position the machined surfaces 10 of the workpiece contact the under surface of tool holder 11. The springs 31 may be substituted by a single spring concentric with the longitudinal axis of the ram and in another modification fluid pressure pistons or plastic material, e.g. rubber, may take the place of springs. The workpiece may have a number of drillings in which case a corresponding number of punches are provided on the tool holder.