Patent ID: 7445098

Claim:
A damper ( 12 ; 12 a ; 12 b ; 12 c ) for spin-drying washing machines comprising a tubular casing ( 13 ) which has a central longitudinal axis ( 14 ); a tappet ( 15 ) which is guided for displacement in the casing ( 13 ) and projects from an end thereof; fastening elements ( 16 , 19 ) which are mounted on a free end of the casing ( 13 ) and of the tappet ( 15 ), respectively; and a frictional damping unit ( 32 ; 32 a ; 32 b ; 32 c ) which is disposed inside the casing ( 13 ), comprising at least one annular elastic frictional damping lining ( 36 ) which is displaceable in relation to the casing ( 13 ) and the tappet ( 15 ) along the central longitudinal axis ( 14 ); at least one stop element ( 44 , 45 ; 44 a , 45 a ; 44 b , 45 b ; 44 c , 45 c ) which is stationary in relation to the casing ( 13 ) and faces toward the at least one frictional damping lining ( 36 ); wherein the at least one stop element ( 44 , 45 ; 44 a , 45 a ; 44 b , 45 b ; 44 c , 45 c ) comprises several stop pins ( 46 ; 46 a ; 46 b ; 46 c ) which extend along the central longitudinal axis ( 14 ); wherein the frictional damping unit ( 32 ; 32 a ; 32 b ; 32 c ) has a contact-pressure piston ( 33 ; 33 a ; 33 b ; 33 c ) which accommodates the at least one frictional damping lining ( 36 ) and has several grooves ( 39 ; 39 a ; 39 b ; 39 c ) which are parallel to the central longitudinal axis ( 14 ); wherein at least one end of the frictional damping lining which is partially uncovered within the contact-pressure piston faces open ends of the grooves; and wherein during motion damping of the at least one frictional damping lining the grooves move over the stop pins to cooperate with the partially uncovered end of the at least one frictional damping lining.