Patent ID: 6041690
Filing Date: 2000-03-28
Classification: E05B,F15B

Abstract:
Pneumatic drive unit for at least partial opening of a movable body part of a motor vehicle with a control member that is linearly movable along a control axis, said member partially extending out of a housing, said member being capable of being pressurized by means of a working chamber provided in the housing, and with a free end of said member being provided with a contact surface for abutting the movable body part, with the body part, in a closed resting position, exerting a contact pressure on the contact surface of the control member,wherein a vent channel is provided that connects the working chamber with the atmosphere, andwherein a closing element is provided that is loaded by a spring arrangement for closing and opening the vent channel, said closing element being held in its closed position when the body part rests on the contact surface of the control member, and when the body part is removed from the contact surface by the spring force of the spring arrangement can be moved into its open position to open the vent channel.