Patent GB-445101-A (GB)
Title: Improvements in shock absorbers
IPC: F16F9/44
Filed: 1934-09-01
Abstract: 445,101. Shock-absorbers. EBSWORTH, R. H., 72, Clendon Road, Toorak, Melbourne, Australia. Sept. 1, 1934, No. 25257. [Class 108 (iii)] In a fluid shock-absorber for vehicles a valve member or members are provided which are resiliently influenced in one direction during a rebound stroke and in the reverse direction during a compression stroke of the shock-absorber the resistance offered by the members to the flow of fluid being proportional to their movement which is controlled by means such as a dashpot or dashpots. As shown in Fig. 1, a piston c reciprocates in a cylindrical sleeve b having apertured ends b<3>, b<4> which co-operate with end compartments of the working cylinder a<12> to form dashpots. A byepassage a<11> communicates with tapered slots b<1>, b<2> in the sleeve through ports a<7>, a<8>, which may be regulated by needle-valves, and through ballvalves a<6> with the ends of the cylinder a<12>. On quick movement of the piston c in either direction the sleeve b is not moved appreciably owing to the action of the dashpots but on slow movement of the piston against the action of the spring c<1> or c<3> fluid is forced through the ports a<7>, a<8> which are gradually closed as the spring-pressure forces the sleeve in the same direction as the piston. The sleeve may be held by a spring-pressed brake a<3> which may be tightened to hold the sleeve in any position. Another construction comprising a rotary vane shock-absorber is described having features similar to those of the above construction. In a modification, Fig. 5, valves b<5>, b<6> having reduced portions b<52> providing variable valve orifices and arranged outside the working cylinder, are connected by a rod b<7> and spring-pressed away from the operating arm b<33>, spaces b<12>, b<13> in the ends of the valve chambers cooperating with conduits b<50> in the valves to act as dashpots. Further constructions are shown in which a rotary valve and an adjustable dashpot or two non-adjustable dashpots, control the operation of the device, the valve in the latter case being connected by linkage to the operating arm, one of the links being pivoted on a rod connecting the dashpot pistons. Fig. 7 shows a construction utilizing a double-acting dashpot b<14> the piston of which is connected by a rod b<7> to a piston b<20> movable in a cylinder b<21> connected by a passage. b<22> with a cylinder b<23> containing a piston b<24> controlling a valve b<25> in the liquid circulating passage of the shock-absorber. The automatic control is regulatable by means of a hand-adjustable piston b<28> slidable in a cylinder b<27> connected to the passage b<22>. In the rotary vane shock-absorber shown in Figs. 9 and 10, the operating arm transmits road shocks or loading pressure through a spring b<41> to a rotatable member b<37> which has a toothed extension b<39> meshing with a toothed quadrant b<40> adapted to rotate an adjustable valve b<43> to vary the resistance. The member b<37> is also adapted to rotate a block b<38> closely fitting a circular channel b<34> which also contains a fixed block b<35> having a conduit b<36>, thus forming dashpots in the two parts of the channel which prevent transmission of sudden shocks to the valve b<43> but allow the transmission of prolonged shocks or changes in load.