GB651358A - Shock and vibration isolating mounting - Google Patents

Abstract

651,358. Resilient mountings. LORD MANUFACTURING CO. Aug. 6, 1948, No. 20868. Convention date, Sept. 8, 1947. [Class 108(iii) ] A resilient mounting comprises a body of rubber having a portion adapted to isolate shock, and a further portion adapted to isolate vibration, and releasable means adapted temporarily to render the latter portion unresponsive to vibratioris. In the construction shown in Fig. 2, nuts 6, 7 are bonded in a rubber body 5 which has a depending skirt 3. The supported member 8 is permanently secured to the nut 6. For shock isolation (as shown), the nut 7 is secured by a screw 12 to part of a packing crate &c. a cup-shaped washer 13 serving to " short-circuit" the skirt 3. For vibration isolation, the screw 12 and washer 13 are discarded, and the skirt 13 rests on the supporting member. In the construction shown in Fig. 5, a rubber body 15 has a conical web 20, the rim of which is seated in a cup-shaped bracket 22 rigid with the supported member 23. A stud 17 bonded to the member 15 passes through a central opening in the bracket 22, and is bolted at 19 to a plate 25. The mounting is converted from vibration-isolation (as shown), to shock-isolation Fig. 4, (not shown), by -securing the plate 25 to the bracket 22 with set screws so as to 'short-circuit the web 20. The plate 25 also serves as a vibration-limiting stop. In the mounting shown in Fig. 8, a rubber body 52 is bonded to the supported member 55, the supporting member 54 and a further member 57. A bolt secures the member 57 to a plate 65 for shock isolation (as shown). The bolt is removed for vibration isolation, the plate 65 then serving as a vibration-limiting stop. A further stop 66 is also provided. In a further construction Fig. 7 (not shown), similar to that shown in Fig. 5, the rim of the web 20 is bonded to the inner periphery of a rigid tubular shell which is seated in an annular socket formed in the supporting member. A plate permanently bolted to a nut bonded to the body 15 may be secured by bolts to the annular socket to short circuit the web 20. The latter plate and a further plate rigid with the supporting member, function as vibration-limiting stops. In a further similar construction, Fig. 6 (not shown), the body 15 has an enlarged rim to which is bonded the inner periphery of an annular plate. Set screws secure the plate to the supporting member, and for shock-isolating, the same screws secure to the supporting member, a further plate, which is bolted as before to the central portion of the rubber body 15. The latter plate is of dished form and must be unbolted from the body 15 and reversed, when the mounting is changed from one form of isolation prevention to the other, so that it functions as a stop in the vibration isolation position, without fouling the set screws.