| 摘要 |
<p>501,795. Hydraulic shock-absorbers. FICHTEL & SACHS AKT.-GES. Oct. 6, 1938, No. 29015. Convention date, April 2. [Class 108 (iii)] Relates to hydraulic shock - absorbers, particularly for railvehicles of the piston and cylinder type in which a , protective sleeve or bellows 23 of rubber or like material surrounds the portion of the piston rod 24 that projects from the cylinder 14. In order to equalize the pressure in the sleeve 23 with the atmospheric pressure when large slow movements of the piston rod occur due to variations of load, a valve device, which is substantially unaffected by the small rapid movements produced in running, is incorporated in the outer end of the piston rod, such device comprising a pair of spring-loaded ball or like valves 29, 30, respectively permitting the passage of air from or to the sleeve 23. As shown, the valves are arranged with adjustable loading in a single valve body 28, and control lateral ducts 43, 46 communicating with longitudinal grooves 33, 36, which in turn place the interior of the sleeve 23 in communication with the atmosphere via lateral ducts 25 and a hollow' bore 26 in the piston rod. A detachable cap 35 with escape orifice 34 gives access to the valve body for the purpose of removing or adjusting the valves.</p> |
