GB627104A - Improvements in hydraulic shock absorbers - Google Patents

Abstract

627,104. Hydraulic shock-absorbers. ELECTROL, Inc. March 24, 1947, No. 8008. Convention date, May 11, 1946. [Class 108 (iii)] In a hydraulic shock-absorber for aircraft landing-gear &c., of the kind comprising a plunger movable in a cylinder, the plunger 13, Fig. 2, is slidably mounted in rings 15, 16 spaced apart axially of the cylinder 10 by a sleeve 27 which is a loose fit within the cylinder. A second sleeve 23 spaces the ring 16 from a cup 17 at the closed end of the cylinder. A plate 24 having a metering orifice 25 is held between the cup 17 and the sleeve 23. A clip 34 prevents the piston 13 slipping through the ring 16, and a similar clip holds the ring 15 in the cylinder. The ring 16 has small holes to allow transfer of liquid, while the ring 15 closes the cylinder, sealing rings 30, 31 being provided. A fitting 43 on the plunger carries an axle, and a valve 20 in the cylinder allows charging. In another construction, Fig. 4, the right-hand ring 57 abuts against a shoulder in the cylinder 50 and is spaced from the other ring 53 by a sleeve 49. Bolts 60, 61 hold the ring 53 in the cylinder. A metering plate 68 is secured to the top of the hollow plunger by a bolt 66. A charging valve 65 in the base of the plunger is connected by a passage 64 to a central hole in the rod 66 which communicates through a radial hole 67 with the inside of the plunger. Rotation of the plunger relatively to the cylinder is prevented by the usual linkage.