of the threaded spindle 5 are associated with vibration damping sleeves not shown here or similar structural elements obviously the construction of the plug type connectors is not restricted to the variations illustrated in fig5 to 9 thus the plug type connectors can be formed by pins or bolts which are provided on one of the housing parts which are to be connected and which engage in a corresponding recess of the other part or through a tongued and grooved connection wherein to produce the positive engagement or an all round force locking engagement a dovetailed groove or t shaped groove is particularly suitable although a u shaped groove or similar could also be included furthermore a number of positive locking slit connections is also possible one design of the invention consists in providing the bearing of the threaded spindle 5 with an emergency actuation this is required to allow the threaded spindle 5 to be unturned in the event of a defect in the gear 9 the vehicle seat can thereby also be moved in this case which is necessary if it is to be dismantled since the screw connection between the holder 6 a 6 b and the bottom rail 4 can be concealed by the top.