Abstract: A spiral displacement machine for compressible media is described which has at least one displacement chamber in the form of a spiral-shaped groove arranged in a stationary housing and also has a spiral rib-shaped displacement body associated with each displacement chamber. Each displacement body is on the side of a disc-shaped rotor which is driven eccentrically in a translatory movement relative to the housing. During operation, each peripheral point of the displacement body performs a circular movement bounded by the peripheral walls of the associated displacement chamber. At the edges of the displacement bodies and of the housing walls forming the displacement chambers, sealing strips mounted in spiral grooves engage the adjacent surfaces of the other component of the machine.

Abstract: An arrangement for the automatic actuation of an automobile clutch operatively located between an automobile engine and a manually shiftable transmission, of the kind that includes a servo motor responsive to auxiliary power applied thereto for effecting engagement and disengagement of the clutch, and control means for controlling the auxiliary power delivery to the servo motor as a function of the position of the accelerator pedal, or the clutch input (engine output) and output (transmission input) rotational speeds, or both, and wherein the control means controls the auxiliary power delivery to the servo motor so that the rotational speed of the engine attains a prescribed rotational speed which is a function of the position of the accelerator pedal, the auxiliary power delivery being an application pulse to the servo motor of sufficient duration to almost completely overcome the free travel of the clutch.