Patent ID: 8051533

Claim:
A double roller with first and second running wheels and a carrying housing comprising a hollow housing portion, wherein a mounting pin is formed on the carrying housing and an actuating push rod accommodated in the housing portion is displaceable in the mounting pin counter to spring force and interacts with a locking counter-part for locking the running wheels in at least one direction, and wherein, in addition, a running-wheel braking part with engagement parts is provided, for rotational blocking of the running wheels in an engagement position of the engagement parts when the actuating push rod is in an uppermost position of the actuating push rod, and wherein, furthermore, the housing portion accommodating the actuating push rod has a first ball bearing on an upper side of the housing portion and encloses at least a lower portion of the actuating push rod, wherein the locking counter-part is located beneath a second ball bearing, in the housing portion.