Patent GB-407554-A (GB)
Title: Improvements in or relating to shock absorbers
IPC: F16F9/22
Filed: 1933-05-03
Abstract: 407,554. Shock - absorbers. DELCO PRODUCTS CORPORATION, 329, East 1st Street, Dayton, Ohio, U.S.A.-(Assignees of Melchior, A. G. O. J.; 33, Elperweg, Westphalia, Germany.) May 3, 1933, No. 12923. Convention date, Jan. 18. [Class 108 (iii).] In a vehicle shock-absorber comprising a cylinder in which a piston having a one-way valve is reciprocated by vehicle spring movements, resistance to vertical movement of the vehicle frame in one direction and particularly to upward movement due to rebound of the vehicle springs, is effected automatically by an inertia-controlled valve which regulates the passage of fluid from a chamber behind one end of a piston-valve and accordingly regulates the position of the other end of the piston-valve relative to an opening through which fluid is circulated by the piston to a reservoir. In the form shown in Figs. 2 and 3, depression of the piston 35 forces fluid through a duct 32 and the resultant fluid-pressure first opens the spring- pressed piston-valve 63 and then a sleeve-valve 70. The main portion of the fluid flows through an opening 34 to a reservoir 28, but some fluid flows through cross-passages 68 and a central passage 67 in the piston-valve to a chamber 61 and thence through a passage 80 to a chamber 81 at the inner end of the rockshaft 49 and then through a bore 82 in the shaft and side passages 83 to an annular exit-groove 84 encircled by a blade spring 91 and connected by a passage 96-with the reservoir. One end 90 of this spring 91 is fixed to a rod 88 eccentrically mounted in the shaft 49, an inertia-controlled mass 8a contained in a recess 85 in the operating-arm 50 of the shock-absorber being fixed to the rod. On sufficiently strong rebound of the vehicle spring the shock-absorber accelerates vertically, causing the rod 88 to turn in the shaft 49 and tighten the blade spring 91, thus closing the exit-groove 84, which results in an increase of pressure in the chamber 61 and a consequent closing movement of the pistonvalve which increases the resistance of the shock-absorber. In the modification shown in Fig. 7, movement of the piston 135 to the left forces fluid through a duct 132 and the resultant fluid pressure first opens a pistonvalve 165 and then a spring-pressed sleevevalve 181. The main portion of the fluid flows through openings 160 into a chamber 131 and then through a passage 197 to the reservoir 128, but some fluid also passes through crosspassages 167 and through a bore 168 in the piston-valve to a chamber 172 and thence through a port 175 to the chamber 131. The outlet through the port is regulated by a valve 176 acted upon by a projection 196 from a bracket pivoted at 190 and supporting an inertia-controlled mass 192, which, on sufficiently strong upward acceleration of the shockabsorber, causes the projection 196 to close the valve 176 thus causing pressure in the chamber 172 to increase and a consequent downward closing movement of the valve 165 resulting in an increased resistance of the shock-absorber. The mass 192 is maintained in position by an adjustable spring 193.