Patent GB-349090-A (GB)
Title: Improvements in or relating to motor cars or like vehicles
IPC: B60G11/08
Filed: 1930-02-10
Abstract: 349,090. Motor vehicle frames &c. MACKENZIE, D. G., 388, Olivier Avenue, Montreal, Canada. Feb. 10, 1930, No. 4504. [Classes 79 (iii) and 79 (iv).] In motor vehicles in which the chassis frame comprises a central longitudinal member associated at each end with transverse leaf springs forming flexible axles, one of the axles serves to support, independently of the central longitudinal member, the power aggregate of the vehicle, embracing the whole of the power unit and transmission &c. gearing associated therewith. Constructional arrangements of the flexible axles, the central frame member and of means for attaching the floor of the vehicle body thereto, are described. The power aggregate, which may be of the construction described in Specification 349,091, is carried in and by a transmission casing 7 attached to leaf springs 2, 3, in different vertical planes, forming therewith the rear axle assemblage. The front axle springs 5, 6, are in the same vertical plane, secured between side plates 15, 16 by straps 18, 19, Fig. 4, with interposed wedges 22, 23 of rubberized material, a supporting bracket 17 for the central chassis member 9 being bolted to the side plate 15 and a horizontal extension thereof. The central member 9 is hollow, of circular or rectangular cross section, as shown respectively in Figs. 3 and 8, and is attached at the ends to suitable extensions on the casing 7 and the bracket 17. In the tubular form, Figs. 1 and 3, the member 9 may be clamped by bolts 26 in a split tubular extension 24 of the casing 7, the connection being rendered positive by a dowel pin. It may be similarly secured at the other end in the bracket 17, but, preferably, at this end, the attachment is of a form allowing a limited amount of relative rotation to avoid strains due to displacements of the axles. The vehicle floor 10, Fig. 3, may be attached by stays 11 of wire or metal strip, at intervals, passing over and pinned to the tube 9 which is seated in cradles 14 secured to the floor. In the construction shown in Figs. 6 and 8, the central member 9 is of inverted trough-like form flanged at its lower edges for attachment thereto of a pressed metal floor 31 strengthened by transverse ribs 32 located under the seat positions. In this form, the ends of the member 9 are split and bolted to projections on the axle brackets. The front bracket in this case may be a simple forging. The floor may be extended under the axle brackets and bolted to flanges thereon. The connections of the outer ends of the leaf springs to the shackle bolts 20, 21, on the wheel brackets 4a, Fig. 4, comprise the usual eyelet formation of the master leaf 40, reinforced by an extension of the adjacent leaf 42 passing partly around the shackle bolt within a housing 43, 44, the auxiliary leaf being retained in position, in the event of breakage of the master leaf, by the housing wall or by a retaining pin 45. In order to advance the centre of gravity of the vehicle, the rear part, including the engine gear box and transmission casing may be constructed of a magnesium or other light alloy, whilst the front part is constructed of the more usual metals, such as aluminium alloy. Specification 344,179, also is referred to.