Improvements in and relating to seats for vehicles

1,070,381. Vehicle seats. BOSTROM CORPORATION. Feb. 4, 1964 [Feb. 8, 1963; July 2, 1963], Nos. 5124/63 and 26286/63. Headings A4J and A4U. A vehicle seat 11 is resiliently mounted on a base part 10 by means of a suspension member 12 which has one end pivoted to the seat 11 and the other end to the base 10, through a torsion bar assembly. The seat back support 11b Fig. 1, is interconnected with a hollow upright portion 10b of the base by rollers 26 which are attached to the back support 11b and movable in the hollow upright portion 10b. Alternatively a pivoted linkage may interconnect the back support and the upright portion to guide the seat, which linkage may be vertically adjustable on a slider moving in the upright. The torsion bar assembly 13 comprises a bearing sleeve 15 fixed to the base 10 and a torsion bar 16 housed within, and attached to the outer ends of a pair of telescoped tubes 17. The load on the torsion bar 16 and hence the upward force applied to the suspension member 12 is varied by rotating one tube relative to the other. This may be effected by rotating a screw 22 upon which is mounted a loading arm 20 secured to the inner end of one tube 17. A shock absorber 30 is mounted within the upright portion 10b having a piston rod 31 connected to the back support 11b. Another seat 41, Fig. 4, is mounted on arms 43 pivotally connected to a base 40 through a torsion bar assembly. The permissible stroke of the seat 41 may be defined by the outer end of a lever arm 61, which is connected to the torsion bar, moving over an arc, between limiting stops 62. By varying the position of these stops 62 the height of the seat is adjusted. Alternatively the upper end of a flexible strap 70 may be secured to the seat 41 or one of the arms 43, and its lower end secured to an adjustable screw 71 so that rotation of the screw 71 adjusts the maximum elevation of the seat. Also an adjustable parallelogram system of links may be connected between the arms 43 and seat 41 to adjust the height of the seat. The seat 41 may be tilted to a vertical unused position shown in dotted lines, Fig. 4. A vibration damper 80 may be fitted within the upright 40b.