Patent GB-598646-A (GB)
Title: Device for damping vibrations in rotating parts of machines
IPC: F16F15/14
Filed: 1940-05-20
Abstract: 598,646. Vibration-dampers. SALOMON, F. M. M. B. May 20, 1940, No. 8934. Convention date, Aug. 7, 1939. [A Specification was laid open to inspection under Sect. 91 of the Acts, Nov. 20, 1940. [Class 108 (iii)] To damp the vibrations of a rotating body two members are mounted thereon to rotate with the body, one a mass which vibrates under the disturbances and the second an eccentrically mounted lever subject to centrifugal force which damps the vibrations of the first. The rotary shaft 1, Fig. 1 and 2, has a web 2, loosely embraced by a hollow mass 6. A roller 4 is loosely engaged in a recess 3 in the web recesses 5 in the sides of the mass 6 so that the mass 6 is free to vibrate. A recess 8 in a mass 9, pivoted on the web and tending to move outward under centrifugal action, engages a roller 7 which is also loosely engaged in the recesses 5. The action of the mass 9 serves to tauten the connections and thus damp the oscillations of the mass 6. In a modification a pin passing through the web 2 and a pin passing through the mass 6 are loosely engaged by two rings and a third ring similarly engages the second pin and also a pin secured to the member 9. In the form shown in Fig. 5, a mass 31 is freely mounted on the shaft 1. Pins 38, 36, fixed to a link 37 are engaged respectively by a recess in the member 9 and by apertures in two parallel links 35. The member 9 is pivoted at 16 to a flywheel 30 rigid with the shaft, and a pin 34 fixed to the links 35 loosely engages in a recess in the mass 31. The Specification as open to inspection under Sect. 91 comprises a number of further modifications. As shown in Fig. 7 (Cancelled) and 8 (Cancelled), an elastic member 54 carrying a mass 53 is free to vibrate between fixed points determined by pins 56, 57, projecting from a plate or fly-wheel 52 on the rotary shaft 51. The member 54 is subjected to tension due to the centrifugal action of a member 53. Several members 54 may be used and such members may have different frequencies. As shown in Fig. 14 (Cancelled) a vibrating mass 53 is subjected to the restoring action of two elastic wedges 72 which rest against shoulders 73 on the member 52. The elastic control of the wedges may be varied by masses 71 which are moved centrifugally by rotation of the shaft 51. To damp vibrations at certain ranges of speed a lever 80, Fig. 18 (Cancelled), may be arranged to contact the member 54 when the centrifugal force of a weight 83 on the lever overcomes the tension of a spring 84. This lever may be itself subject to control of a second similar counterweighted lever 86. To compensate for higher harmonics the member 54 may be subdivided by the provision of intermediate nodal points. The tension in the member 54 may be increased by causing centrifugal force to act on the lever principle. The member 54, Fig. 20 (Cancelled), may be forced with an eyelet 102 the inner surface of which is engaged by a cylinder 104 on the short arm of a lever 103, pivoted on a plate or fly-wheel 52 and carrying a centrifugally-acting mass m, on the outer arm. Fig. 27 (Cancelled) shows a device for damping vibrations of a shaft 51 in a plane parallel to the shaft. An elastic member 112 which may carry a mass 53 is fixed between a boss 52 keyed on the shaft and a felloe 111. This subject-matter does not appear in the Specification as accepted.