Actuation device

Actuation device for opening and closing a cover in or on an automobile, with a push-push kinematic, which engages with with the cover, wherein the push-push kinematic comprises the following features:

• a housing, which is suitable to be amounted in an automobile,
• a pusher supported in the housing rotatable about its longitudinal axis and axially moveable, which pusher comprises an outer actuation end, which during an actuation protrudes over a housing opening out of the housing at least temporarily and engages with the cover, and an inner actuation end being opposite the outer actuation end,
• a spring in the housing, which biases the pusher out of the housing,
• a ring surrounding the pusher over a part of its axial moving range, which ring is axially fixed and rotatably supported in the housing and which comprises at least one projection at its inner circumference,
• at least one groove extending on the outside of the pusher at least in sections helically about the longitudinal axis of the pusher, and at least one projection at the inner circumference of the housing, which engages with the groove at least over a wide axial movement range of the pusher, so that the pusher upon an axial movement in the housing is also rotated about its longitudinal axis,
• a first diverting surface on the pusher between the groove and the inner actuation end and extending obliquely with regard to the axis of the pusher which diverting surface engages with the at least one projection of the ring and rotates the ring about a predetermined angular amount, when the pusher is moved into the housing by a predetermined first stroke,
• at least one locking recess on the pusher in circumferential distance to the at least one first diverting surface and being opened towards the outer actuation end, which locking recess receives the at least one projection of the ring when the pusher is released after the first stroke, whereby the pusher is locked in a locking position after a reverse stroke in the housing, and
• at least one second diverting surface between the locking recess and the groove, which extends obliquely with regard to the axis of the pusher, and which second diverting surface engages with the at least one projection of the ring, when the pusher is moved out of the locking position by a second stroke further into the housing, whereby the ring is rotated by a predetermined second angular amount into a rotational position, in which the pusher is moveable out of the ring into its furthest extended position, wherein the at least one projection of the ring exits through an exit opening at the inner actuation end of the pusher (18).