Patent GB-1078562-A (GB)
Title: A multi-purpose machine tool
Inventor: GIDLEY ROLAND
IPC: B24B27/00
Filed: 1963-02-26
Abstract: 1,078,562. Abrading. GIDLEY (MACHINERY) Ltd. May 26, 1964 [Feb. 26, 1963], No. 7568/63. Heading B3D. [Also in Divisions F2 and F4] A multi-purpose machine tool comprises a rotatable table having mounted thereon a plurality of rotary tools, and a single driving motor on a fixed support, the axes of the shafts of said tools and of the motor spindle being so disposed that as any tool is brought opposite to the motor by selective rotation of the table its shaft is aligned with the motor spindle and is adapted for driving connection to such spindle, and a locking means arranged to locate the table in selected angular positions about its axis of rotation, such positions corresponding to the alignment of a tool shaft with the motor spindle. The motor spindle (1), projecting from the bearing (2) of the motor housing, has an axially extending eccentric driving pin (3). The shaft (4) of the tool has a thrust receiver (5) of elliptical section which, when the spindle (1) and shaft (4) are in alignment, lies in the path of the pin (3) whereby the spindle and shaft are coupled. The pin (3) may be carried in a resilient part of the motor spindle or drive may be transmitted through a coil spring. A brake disc (6) may be provided on the motor spindle. The motor and the inner ends of the tool shafts may be housed in a cover the flat top of which serves if necessary as a workholding table or the like. In a modification, a stationary circular table (10) has a raised central boss (11) on which is mounted an electric motor (12) with its spindle (13) radial to the table and directed to the operative's working position. The table is mounted on a cylindrical casing having levelling screws 42 and a hinged access door. Rotatably mounted on the table (10), preferably on ball bearings, about the central boss is a working table 16 carrying grinding wheels 17a, 17b, a chuck 17c, buffing wheels 17d, 17e and a belt sander 17f, each having a shaft 18 arranged radially of the table 16. The table 16 is held in indexed position by engagement of a conical recess (16a) in the underside of the table by the conical end (19a) of a plunger (19) operated by a treadle 21. A sliding clutch member 24 mounted on the motor spindle has at its forward end a ribbed boss (25) engageable with a grooved end of the corresponding shaft 18. Other forms of clutch may be used, e.g. magnetic. A brake disc (27) on the motor spindle is engageable by a brake pad (28) operated by a lever (29). Depression of the treadle 21 against a loading spring may first brake the motor, then withdraw the clutch member 24 and then release the table 16 by withdrawing the plunger (19). The sequence is reversed when the treadle is released. A dust receiver (30) within the cylindrical casing has an inlet conduit (31) connected to a conduit 32 extending out of the easing and having in its top face an opening 33 registering with a collector 34 associated with the belt sander 17f or with a collector (35) associated with the grinding wheel 17b. The collectors are removable to permit indexing of the table 16.