Patent ID: 8186730

Claim:
A lock mechanism with a moving part of a motor vehicle, such as a hinged lid ( 40 ) or door, and a stationary part ( 60 ) of the motor vehicle, consisting of a lock ( 12 ) on one part ( 50 ) of the motor vehicle and a closing part ( 10 ) on the stationary part ( 60 ), where the lock ( 12 ) comprises a rotatably supported catch ( 15 ), a rotatably supported latch ( 20 ) with an actuating arm ( 21 ), and a motorized opening aid ( 30 ), the catch ( 15 ) has a recess ( 13 ) for the closing part ( 10 ) and at least one stop notch ( 16 , 17 ) for engaging the latch ( 20 ), the catch ( 15 ) and the latch ( 20 ) are spring loaded ( 19 , 29 ) towards each other, and the opening aid ( 30 ) has a driven eccentric ( 40 ), whose eccentric curve ( 46 ) cooperates with a lateral actuating surface ( 22 ) on the actuating arm ( 21 ) in order to move the latch ( 20 ) by means of a motor out of its locked position ( 20 . 1 ) in the catch stop notch ( 17 ) and into a lifted position ( 20 . 3 ), in which the catch ( 15 ) is released, wherein the eccentric ( 40 ) has two segments ( 41 , 42 ) of differing relative elasticity, the segments including an inelastic main segment ( 41 ) in a region of smaller radii ( 61 , 62 ) of an eccentric curve ( 46 ) of the eccentric ( 40 ), the main segment beginning with an impact surface ( 45 ), and an elastically yielding ( 59 ) end segment ( 42 ) in a region of larger radii ( 62 , 63 ) of the eccentric curve ( 46 ), the end segment ( 42 ) ending with an eccentric shoulder ( 43 ) at a maximum end radius ( 63 ), wherein the latch ( 20 ) has an opposing impact surface ( 25 ) which, in a final phase of the driving of the opening aid ( 30 ) strikes the impact surface ( 45 ) of the main segment ( 41 ) and stops further motorized rotation of the eccentric ( 40 ), wherein during rotation of the eccentric ( 40 ) the latch ( 20 ) strikes a stationary stop ( 18 ) in the lock ( 12 ), which stop ( 18 ) defines a fully lifted position ( 20 . 3 ) of the latch ( 20 ), whereby the lateral actuating surface ( 22 ) of the actuating arm ( 21 ) radially limits a free space for the eccentric curve ( 46 ), wherein during rotation of the eccentric ( 40 ) the main segment ( 41 ) with the small radii ( 61 , 62 ) passes through, but not the end segment ( 42 ) with the larger radii ( 62 , 63 ) which results in the actuating surface ( 22 ) bending ( 56 ) the eccentric until the eccentric shoulder ( 43 ) snaps behind an opposing shoulder ( 23 ) on an end of the actuating arm ( 21 ), and after snapping in, the eccentric shoulder ( 43 ) and the opposing shoulder ( 23 ) on the actuating arm ( 21 ) prevent a reverse rotation ( 64 ) of the eccentric ( 40 ).