Patent GB-599850-A (GB)
Title: Improvements in or relating to spring suspensions for vehicles
IPC: B60G5/053
Filed: 1944-11-30
Abstract: 599,850. Road-vehicle spring-suspensions; laminated springs. STANDARD STEEL SPRING CO. Nov. 30, 1944, No. 23939. Convention date, May 4. [Classes 108 (ii) and 108 (iii)] A vehicle spring-suspension comprises a pair of supports each connected to a road wheel and movable up and down therewith and connected to each end of a single plate spring by a linkage, and means for applying a load from a frame member to two points of load application on the spring intermediate its points of support, the spring being unsupported between the points of load application, one of which is movable relative to the frame member. When applied to the suspension of the rear wheels of a vehicle, each end of the spring 11, Fig. 1, is clamped by bolts 12, 23 and backing plates 13, 24 to bending arms 10, 19, respectively. The bending arm 10 is pivotally secured to a bracket 6 rigidly mounted on the axle housing 4, and the other bending arm 19 is connected to another bracket 15 rigid with the axle housing 4 through a swinging link 17. The frame 2 is secured to the inner end of the bending arm 10 by two pins 9a, one on either side of the spring 11, each engaging a laterally-spaced eye formed on the arm 10 and a downwardly extending arm of a bracket 8 rigid with the frame 2. The other side of the frame 2 is pivotally connected to two links 21 each of which are pivotally connected at their lower ends by pins 20 to laterally-spaced eyes on the inner end of the bending arm 19. Fig. 1 shows the normal load position of the spring which has an upward camber when unloaded. Elongation and shortening of the spring under load is permitted by deflection of the links 17, 21. When applied to the suspension of tandem wheels (Fig. 6) the wheel axles 44 are mounted in brackets 43 which are each rigidly connected to two links 39 pivotally connected by links 36, 41 to 'the frame 30. A plate spring 53 is clamped at each end by bolts 55 and backing plates 54 to bending arms 49 which are each pivotally connected at their outer ends by pins 48 to the lower ends of two links 46 which are pivotally suspended at 47 from the arms 39. The inner ends of the bending arms are each freely connected by pins 50, 52 and links 51 to the lower frame member 32. Fig. 6 shows the position of the spring under load and alteration in length of the spring is permitted by the deflection of each set of links 46 and 51 but, alternatively, the bending arm at one end of the spring may be pivotally connected directly to the links 39, the links 46 and 51 at the other end providing the necessary freedom. In an alternative arrangement, both sets of the links 46 may be dispensed with by mounting the connecting pins 48 of each bending arm in slots in the link 39 and receiving the pins 52 in slots instead of holes in the frame members 32. Alternatively the slotted holes may be replaced by rubber mountings for the pins 48 and 52. When applied to independentlysuspended front wheels (Fig. 10), the wheel axle 72 is pivotally mounted on a king pin 70 carried by a bracket 65 which is connected by swinging links 60, 67 to a frame cross-member 63. A plate spring 81 is clamped at each end to a bending arm 76, the outer end of which is pivotally mounted on a rubber bush 68 carried by a pivot pin 66 of the link 67 and bracket 65. The inner end of the bending arm is suspended from the cross member 63 by two links 78. Change in length of the spring (shown under load in Fig. 10) is permitted by the rubber bushes 68.