Patent GB-740519-A (GB)
Title: Improvements in or relating to anti-vibration mounting devices
Inventor: WELLS ALFRED WILLIAM JOHN
IPC: F16F15/067
Filed: 1953-11-06
Abstract: 740,519. Resilient mountings. WELLS & CO., Ltd., A., and UNITED-CARR FASTENER CORPORATION. Oct. 1, 1954 [Nov. 6, 1953], No. 30777/53. Class 108 (3). An anti-vibration mounting comprises a columnar member 26 passing through an opening in the base 20a of an up-ended potshaped member 20, two sets of springs 29 on respective sides of the base 20a, the springs being connected at their opposite ends to the base 20a and to the member 26 respectively, arranged with their axes on the surfaces of two opposed cones, and under equal tension when the mounting is unloaded, and a resilient vibration damper disposed between the members 20 and 26. In Fig. 11, the vibration damper comprises a disc 59 disposed between spring leaves 58 secured to the member 20. A spring plug 60 rigid with the disc 59, engages the sides of a cavity 62 in the member 26. The cavity 62 is formed by opposed frusto-conical surfaces. In the unloaded condition of the mounting, the widest section of the spring plug 60, engages the widest part of the cavity 62. The springs 29 are alternately rated to take different loads. Plates 30, 31, rigid with the member 26, limit the axial deflection of the mounting. Radial deflection is limited by a member 33. In Fig. 9, the vibration damper comprises buttons 34 slidable in sleeves 36 carried by the plate 31, and outwardly urged by springs 35. The buttons 34 coact with a member A having two frusto-conical sections 55, 56. In the no-load position shown, the buttons 34 are not in contact with the member A. The latter may be formed with axial slits. The buttons 34 may however bear directly on the walls of the member 20, the member A then being dispensed with (Figs. 1-4, 8, 10, not shown). In the latter case there may be lost motion (Fig. 8, not shown), between the plate 31 and the member 26, in the axial direction. The member 26 may comprise two telescopically disposed sections which have a degree of relative axial lost motion (Fig. 10, not shown). The lost motion may be damped by the provision of soft resilient material, or a spring within the sections of the member 26. The springs 35 and buttons 4 may be disposed vertically between the plate 31 and a base-plate closing the lower end of the member 20 (Fig. 6, not shown). The coils of the spring between the head of the button 34 and the outer end of the sleeve 36 may be closely coiled (Fig. 4, not shown). The last-mentioned construction may be modified by omitting the head of the button 34, the end coil of the spring bearing directly on the wall of the member 20 (Fig. 5, not shown). The buttons 34 may be of tufnol, phosphor bronze, or sintered metal, and may be suitably lubricated. In another construction (Fig. 7, not shown), the vibration damper may comprise a washer formed of wire mesh and secured to the bottom of the member 26. The periphery of the washer frictionally coacts with the wall of the member 20. Machines for measuring the deflection of the mounting under both steady and vibrating applied loads, are described. Performance curves of the mounting are given. The invention may be applied to the mountings described in Specifications 571,026 and 719,590.