Patent GB-413689-A (GB)
Title: Improvements in or relating to means for balancing inertia effects in mechanically oscillating systems
IPC: B06B3/00
Filed: 1932-11-18
Abstract: 413,689. Utilizing inertia to obtain movements in machinery. SCHIEFERSTEIN, G. H., 105, Alt-Moabit, Berlin. Nov. 18, 1932, No. 32686. Convention date, Nov. 20, 1931. [Class 80 (iv).] In order to absorb sudden disturbing forces in oscillatory apparatus comprising two equal or unequal masses B<1>, B2, such as conveyer troughs, screens or agitating vessels, oscillating 180‹ out of phase, the virtual centre of gravity of the whole apparatus is freely movable along a practically straight line which passes through the centres of gravity of the oscillating masses when at rest. The oscillating screens B<1>, B2, Fig. 3, energized by a motor M through a loose-coupling z, are interconnected by pairs of leaf-springs d, the lower ends of each of which are clamped to a common foot connected to the foundation by leaf-springs k of adjustable length ; by a loosely-rocking foot, or by pivoted links, to allow the movement of the virtual centre of gravity referred to. The ends of the springs d are clamped between jaws c having flared ribs over which the springs roll to cause inharmonic oscillation of the masses, and the springs are inclined in order to produce a shovelling motion in the screens. In Fig. 7, masses A<1>, A<2> are connected by " inharmonic " rubber balls d<3> carried in a frame r, the masses engaging the balls by means of projections f at the centre of gravity of each mass. The frame r is connected to the foundation C by leaf-springs k, the masses being supported by springs h. Fig. 8 shows an agitating vessel A<1> surrounded by an oppositely-oscillating counterweight A<2>, the two being connected by harmonic springs d and also by rounded rubber members u which only contact with a projection f on the mass A<1> when the stroke exceeds a predetermined amount, whereupon inharmonic oscillation ensues. The feet of the springs d are adjustable for length and are carried on rubber pads i. In a modification, Fig. 10, not shown, the two masses are mounted on vertical leaf-springs, all secured to the foundation at the same side of the masses, which latter are connected by harmonic rubber buffers supplemented by inharmonic leaf springs. In a further modification, Fig. 11 (not shown), both masses are suspended on inclined leaf springs and one mass carries a frame housing a pair of aligned helical springs separated at their inner ends by a pair of spaced rubber-faced projections on the other mass, between which projections is a single driving-projection on the first mass. Several sets of oscillating masses such as the screens B<1>, B<2>, Fig. 3, may be connected together end-to end by rigid or flexible couplings and in the latter case the inclination of the connected screens may vary. In Fig. 3 the upper screen B<1> is wider than the lower, its sides being extended beyond the springs. The Specification as open to inspection under Sect. 91 describes various inharmonic loosecouplings such as z in Fig. 3. In one of these, Fig. 9 (Cancelled), the mass B<1> carries springs d, connected with the oscillating connecting rod y, of a driving-motor M on the mass B<2>, by springs d<1>, which allow transverse movement. The spring clamping jaws are flared to render the coupling inharmonic. In another form the connecting-rod y is connected to the springs d by a pair of flexible leather straps, the tension of which can be adjusted by a set-screw. In the form shown in Fig. 3, there is a single V-shaped spring d clamped at its centre to the connecting-rod y and at its ends to the mass B<1>. This spring may be in three pieces joined at its corners by elbow-jaws with flared clamping-surfaces. Two flexible couplings for connecting screens end-to-end are also shown. This subject-matter does not appear in the Specification as accepted.