Patent GB-400341-A (GB)
Title: Improvements in or relating to shock absorbing devices operated by liquid or gaseous fluid and applications of the same
IPC: B60G21/073
Filed: 1932-06-20
Abstract: 400,341. Road - vehicle suspension. DUPUY, P., 12, Avenue d'Eylau, Paris, and MERCIER, J., 7, Rue Pierre Cherest, Neuilly-sur-Seine, both in France. June 20, 1932, No. 17444. Convention date, June 19, 1931. [Classes 108 (ii) and 108 (iii).] Pneumatic springs; lateral canting, preventing pneumatic vibration-dampers.-A resilient element applied to vehicle suspension, aircraft landing gear, buffers, shaking apparatus and consisting of an elastic or flexible container containing a gas or a liquid, is associated with rigid bearing surfaces the inner parts of which are convex while the outer parts are concave, the container being in contact only with the convex surfaces under normal conditions. The containers are connected to auxiliary containers through throttling orifices which, on vehicles, are controlled by the driver, by the steering gear or by centrifugal force when running on curves. Groups of containers may be associated to prevent lateral tilting of vehicles. The containers may also be applied to the suspension of independently mounted vehicle wheels and additional containers may prevent lateral movement of the frame or body relatively to the axle. In the application to a vehicle, Fig. 4, the flexible container 3 engages shaped rigid bearing surfaces 4, 6 on the frame 1 and axle 2, while similar containers 8 control the lateral movement of the frame. The container may, as shown in Fig. 13, consist of an elastic air receptacle 107 and a flexible but inextensible cover 103 with wired edges 106, the lower bearing 2 being formed with convex and concave surfaces. The effective capacity of the container is increased by a connection 108 to an auxiliary container 112, the connection being adapted to throttle the fluid and act as a vibration damper. In the construction shown, a throttling orifice 117 is provided in a spring-controlled valve which lifts when the container A is subjected to excessive shock, but only allows a slow restoring action. An additional tension wire 106<1>, Fig. 14, may be provided. When applied to vehicles, a throttling valve between the main and auxiliary containers may be closed so as to stiffen the suspension at will or when running round curves. This may be effected by a connection to the steering gear or by centrifugal force. In the construction shown in Fig. 7, a curved tube 12 of glass arranged transversely on the vehicle contains a drop of mercury 13 which closes contacts 14, 15 when the vehicle is running straight ahead, and thus completes a circuit through an electromagnet 17 which holds the throttling valve 19 open. Deviation of the vehicle to either side results in movement of the mercury and the closing of the valve 19 so that the suspension becomes stiffer. The, valve may be controlled by relative lateral movement between the frame and axle. Elastic containers 3, 31, 10, 10<1>, Fig. 11, arranged above and below the axle 2 may be interconnected as shown, the tube 11, 11<1> being connected by a four-way valve or otherwise. In the independent wheel suspension shown in Figs. 16 and 17, the container A acts on a transverse lever 123 pivoted to the frame 122 and to the disc 126 which is further controlled by triangulated levers 128. The stay 129<a> may be dispensed with and the pivots 125, 129 replaced by ball- and-socket joints which serve as the steering axis.