| 摘要 |
341,779. Pneumatic and hydraulic shock-absorbers. MESSIER, G. L. R. J., 29, Avenue LÚon Gambetta, Montrouge, Seine, France. March 21, 1930, No. 9059. Convention date, April 8, 1929. '[Class 108 (iii).] Pneumatic springs which may be combined with a liquid damping device comprise a piston with liquid on both sides working in a cylinder, one layer of liquid being connected with a closed compressed air chamber while the other layer communicates with the atmosphere. In the construction shown in Fig. 1, the two elements whose relative movements are to be restrained are connected respectively to the piston 2 and the cylinder 1. The liquid on the upper side of the piston 2 communicates through a depending tube with the compressed air chamber 5, while the liquid on the under side of the piston communicates with the atmosphere through a reservoir 6 having a number of baffle plates 9. The movement of the piston in either direction may be further restrained by one-way valves 7, 8. A ball valve may be employed, as shown in Fig. 1a, to prevent escape of liquid to the atmosphere. Several modifications are shown in which the shapes and relative positions of the compressed air chamber and reservoir are varied. When applied to an aeroplane a reservoir of stream-line shape may enclose the other parts. Specification 321,035, [Class 108 (iii), Springs &c.], is referred to. |
