GB439667A - Improvements in the method of mounting a machine on a support - Google Patents

Abstract

439,667. Machinery beds and frames. AUBAREDE, P. C. A. M. d', St.-Genis Laval, Rhone, France. March 11, 1935, No. 7578. Convention date, March 9, 1934. Addition to 413,092. [Class 80 (iv)] [See also Groups XXXII and XXXI] In the device claimed in the parent Specification, the springs disposed between the machine and the support have a stiffness which is constant up to a certain load and thereafter increases with the load. In the arrangement shown in Figs. 1, 2, and 5, a motor-vehicle engine is supported near the line F-F along which the resultant translational inertia force acts on it by compression springs 34 connected to the engine through arms 36, 37. When the engine tilts owing to the torque which it exerts one of the springs is further compressed so that some of its turns rest on the sound deadening base 39, its stiffness thus being increased, while the other spring expands somewhat but experiences little change in stiffness. Surging is stated to be thus avoided. The engine is supported at the rear by an arm 3 having a transversely-curved end 8 resting on rubberized fabric strips 1, 2 resting on laminated springs 9 secured to projections 4 on the chassis. The arm 3 of the engine is secured to the strips 1, 2 by a bolt 7 secured to a locking plate 6 spaced from the springs 9 by a block 10. The strips 1, 2 may have metal reinforcements. Movement of the front of the engine is limited by a stop, Fig. 25, comprising blade springs 61 carrying a block of rubber 62 adapted to come into progressive engagement with the curved sides 63 of a box fixed to the chassis. The central blade 61 projects through an aperture 65 in the box to act as an indicator to assist in centring the engine. Alternatives to the springs 33, 34 include coil springs of variable pitch or gauge, conical wire compression springs adapted to seat progressively on a conical projection, springs of different diameters resting in containers adapted to seat progressively on a base, blade springs arranged concertina fashion and arranged to seat one after another on stops, conical wire torsion springs arranged to seat progressively on a rotatable cylindrical core and cylindrical wire torsion springs on a conical core, a series of curved hair-pin shaped springs whose legs are arranged to touch each other progressively, and which may be unevenly spaced, a vane rotatable in a rubber block on a casing having two internal projections, a curved shoe resting on a pneumatic cushion, and a curved inverted carriage spring supporting the load at its centre and adapted progressively to engage the flat tops of resilient blocks by which it is supported at its ends. Alternatives to the support shown in Fig. 5 include a vertical bar supported with play between flexible cheeks clamped to the chassis by angle pieces, two flexible strips at right angles, and rubber blocks arranged in cavities formed between the arm 3 and the chassis. Specification 418,359 is referred to.