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    • 2. 发明专利
    • Improvements relating to electromechanical vibrators
    • GB981217A
    • 1965-01-20
    • GB315461
    • 1961-01-26
    • PETER GROOTENHUISDERRITON LTD
    • H02K33/18
    • 981,217. Vibratory electric motors. DERRIBRON Ltd., and P. GROOTENHUIS. Jan. 22, 1962 [Jan. 26, 1961], No. 3154/61. Heading H2A. In a vibrator of moving-coil type for driving a testing table 25, the tubular support 31 of the moving coil 32 is braced by radial webs 30 secured to the table, and accommodated in radial slots 37 in the central polepiece. The table has a central boss 27, a stiffening rib 29 and a peripheral skirt 28 to which a flange 33 on the coil-supporting tube is bolted. The coil supporting tube is of fibreglass and has an axial flange 34 at its lower edge. The bracing webs radiate from the central boss and are bonded to the coil supporting tube and also bolted to its lower flange 34 by bolts 35 which also secure the lower supporting diaphragm 42. Two other diaphragms 40 and 41 are secured to top and bottom of the tableflange 28. The upper diaphragm 40 is faced with rubberized fabric and forms an airtight compartment into which cooling air may be forced at 46, this air being withdrawn at 45. This feature enables the table to be supported by air-pressure if required. Downward movement is limited by a rubber buffer 48 at the bottom of the central recess in the central pole, and buffers may be provided to limit the upward movement. Lateral buffer pillars 52, 53 may carry a degaussing coil 55.