GB629354A - Improvements in or relating to resilient load-transmitting devices - Google Patents

Abstract

629,354. Resilient mountings. THIRY L. F. March 17, 1947, No. 7317. Convention date, March 20, 1946. [Class 108 (iii)] [Also in Group XXIV] In a resilient mounting of the kind in which a resilient member is disposed and preferably compressed between two opposed rigid surfaces so as to be in rolling contact with each over a substantial area, the member is attached to one or both of the surfaces over a part only of the respective area or areas so as to prevent permanent displacement of the member along the surfaces without unduly restricting the rolling action. As shown, a natural or synthetic rubber ring 5, Figs. 1 and 2, is compressed between the outer surface of a seamless steel, brass or other tube 1 supporting by a flange 9 a load 12, and the inner surface of a similar surrounding tube 2 mounted by a flange 10 on a support 11. The flanges 9, 10 may be welded or riveted to the tubes. The ring 5 is secured to the tubes over areas 15, 16 occupying suitably from one-fourth to one-half, and preferably about one-third, of the respective total contact area. The cross-section of the ring when unstressed may be circular or rectangular with rounded corners. When the mounting is fully deflected under load, the flange 9 engages a rubber bumper 13 on the tube 2. Adhesion over the areas 15, 16 may be effected by coating the corresponding portions of the rubber and/or the tubes previous to assembly with thermoplastic hard - drying resinous materials such as rubber chloride, heatplastic rubber isomers or certain polyvinyl butyral modified phenol formaldehyde resins. After the coating has hardened, the mounting is assembled and bonding obtained by rapidly heating the tubes sufficiently to soften the coating, preferably without any prolonged heattreatment of the rubber. The remaining contact portions of the rubber and/or the tubes may be pre-coated with adhesion-preventing materials such as sodium silicate or gelatin, dried to a hard surface to allow assembly without smearing. In this case, the entire surface of the rubber may be subsequently coated with a hard-drying adhesive such as rubber chloride solution, the mounting being assembled before or after this has dried. Where the ring is not in a compressed state when assembled, it may be initially partly or wholly of uncured rubber and be vulcanized when in position with, if desired, simultaneous bonding using adhesion inhibitors as before. A heavyduty mounting giving progressive compression of the resilient member with increasing load comprises two rubber rings 44, 45, Fig. 8, secured as before to the sides of a tapering annular recess 38 in a support 36 and to the sides of a complementary annular projection 39 in a loaded member 35. The rings 44, 45 may when unstressed be of circular section or be shaped sectionally as parallelograms with rounded corners to conform roughly to their working spaces. Deflection under load is limited by a rubber bumper 55, and a drain plug 54 is provided.