Abstract: A compressive member is used to bias a seat backrest into a predetermined position, generally upright as illustrated, relative to a seat base with the compressive member deforming to enable the seat to be pivoted by the application of force to the backrest. When used on a materials handling vehicle for which it is particularly applicable, the resiliently biased backrest attenuates forces that are transferred to the back of an operator occupying the seat when the vehicle is driven over irregularities in a floor supporting the vehicle.

Abstract: A machine tool such as a lathe having an automatically changeable tool turret and a turret changer, carried on the bed of the machine, that dismounts a turret from a spindle of a turret index unit and mounts a replacement turret thereon. Transfer of a turret between the changer and the spindle is accomplished by axial and rotary movements produced by components that are associated with the index unit and that provide other functions during regular turret indexing and machining operations. The turret mounts on the spindle with a bayonet-type connection. The changer includes a pair of opposed arms that each carry a turret and that alternately swing into alignment with the spindle.

Abstract: A tool turret mechanism is for use with a machine tool having a rotatable workpiece spindle. The axis of the turret is at a small acute angle to the axis of the workpiece spindle for tool clearance and the turret has first and second surface portions mounting first and second pluralities of OD turning tools and ID turning tools, respectively. The two pluralities of tool mounting surfaces are generally in the same plane. The plurality of OD turning tool mounting surfaces is in a plane which intersects the ID tool mounting surfaces. The turret is asymmetric in that the spacing angles between the OD turning tool mounting surfaces are less than the spacing angles between the ID turning tool mounting surfaces, thereby permitting a greater number of tools to be mounted on a given size turret, and giving greater flexibility in permitting first given numbers of OD and ID tools or, alternatively, a greater number of OD turning tools and a lesser number of ID turning tools.