GB1449014A - Vibrators - Google Patents

Abstract

1449014 Resilient mountings LING DY. NAMIC SYSTEMS Ltd 26 Sept 1974 [4 Oct 1973] 46344/73 Heading F2S [Also in Division H2] A vibrator includes a suspension system having a plurality of arms coupled at respective ends to fixed and moving members of the vibrator by resilient couplings, which arms comprise at one end an arcuate surface which rolls on the adjacent surface of a sheet or strip spring, as the moving member is vibrated. Each arm 21 is bifurcated (Fig. 1, not shown), is curved at 34 and is fixed to a single leaf spring 31 (or three springs, Fig. 8, not shown) which is itself fixed to a suspension ring 6. At the other end of the arm 21, the bifurcated portion embraces coaxial cylinders 23, 25 having a resilient rubber or plastics bushing 22 bonded in between. One cylinder is fixed to the arm 21 and the other to a support 14 on the moving member 7. Movement in the Y- and Z-directions is limited by the bushing 22. The inner cylinder 22 is fixed to the arm 21 by a bolt 25 which has an eccentric shank portion (28, Fig. 4, not shown) which by rotation varies the effective length of arm 21 and thus the stiffness of the suspension in the X-direction (i.e. the direction of vibration). As shown, the driving force is electromagnetic. An A.C. energized coil 8 on the moving member, moves in the air gap 4 of a D.C. energized electromagnet 2, 3, 5 carrying the suspension ring 6 and having a coil 8 for suppressing stray magnetic fields. The vibratory drive may alternatively be hydraulic or pneumatic.