Patent GB-570167-A (GB)
Title: Improvements in or relating to hydraulic shock absorbers
IPC: F16F9/48
Filed: 1943-01-08
Abstract: 570,167. Hydraulic shock-absorbers. MONROE AUTO EQUIPMENT CO. Jan. 8, 1943, No. 408. Convention date, Nov. 26, 1941. [Class 108 (iii)] In a hydraulic shock-absorber of the directacting, piston and cylinder type, the piston C has a valve-controlled opening therethrough, while the cylinder A has, at one end, a valvecontrolled opening and is also provided at each of four longitudinally-spaced points with a series of valve-controlled openings 28 ... 31 for the passage of liquid, the series of openings at two of the four points being adapted to be closed by the piston C when the shock is sufficiently great. As shown, the openings 29, 30 are controlled by identical valve assemblies 33, 32 which are reversed relatively to each other. Each assembly comprises an annular body 34 or 43 sleeved on the cylinder A against a shoulder 35 or 44 and resting on a shoulder 36 or 45 of an annular retaining member 37 or 46, a circular series of passages 38 or 47 extending horizontally in the annular body 34 or 43 in registration with the openings 30 or 29 in the cylinder and provided with upwardly or downwardly-opening extensions 39 or 48. Between the horizontal passages 38 or 47 is a circular series of vertical open-ended passages 40 or 49. A laminated spring valve 41 or 50 normally closes the upper or lower ends of the extensions 39 or 48 and a spring-pressed, discvalve 42 or 51 is mounted beneath the annular body 34 or on top of the body 43 so as normally to close the passages 40 or 49. A baffle tube 55, suspended from an annular bracket 52 carried by the upper body 43, extends downwardly below the normal level 56 of the liquid and has embossed portions 57 which maintain the tube spaced from the cylinder A forming a passageway 62. Apertures 25 in the piston are normally closed by a laminated spring valve 24 and, on compression of the shockabsorber, normal shocks cause the piston to force liquid through-the openings 30, passages 38, and extensions 39, past the valve 41 to the reserve chamber B surrounding the cylinder A, while liquid flows from the reserve chamber through the passageway 62, passages 49, passageway 59 formed by the retaining member 46, and openings 28 into the upper part of the cylinder. Heavier shocks cause the piston to close the openings 30 when the liquid is forced from the cylinder to the reserve chamber through openings 16 and past a laminated spring valve 17 in a valve assembly at the bottom of the cylinder, the space above the piston continuing to be refilled through the openings 28. On rebound, normal extension movements cause the piston to force liquid to the reserve chamber through the openings 29, passages 47, extensions 48 and past the valve 50 into the passageway 62, while liquid flows from the reserve chamber through the passages 40, past the valve 42 to the passageway 60, formed by the retaining member 37, and through the openings 31 into the space beneath the piston. Heavier shocks cause the piston to close the openings 29 when the increased pressure forces liquid through the piston apertures 25 and past the valve 24, the space below the piston continuing to he refilled through the openings 31.