Abstract: The base frame of the trolley is constituted by two elbowed side members of wire joined together by horizontal cross-members. On each side of a top portion fixed against the underside of the carrier basket, the side members are provided with a sloping front portion and a sloping rear portion. The sloping front portion is capable of nesting beneath the carrier basket of a similar trolley at the time of interengagement of two trolleys in order to slide against the rear cross-member of the base frame of the trolley located in front, thereby causing an upward displacement of the rear end of the front trolley at the end of the nesting movement, the rear wheels of which are lifted off the ground.

Abstract: A safety turnstile for permitting entry of the public in one direction and preventing exit of the public in the opposite direction comprises a rotary head which can be removed from the turnstile support post in a rapid and simple manner. The rotary head is tightly fitted on the central pivot which is secured to the top end of the turnstile post. Provision is made for an annular member fixed beneath the base of the head and for a ring provided with projecting lugs which are capable of resilient snap-action engagement within retaining recesses formed in the internal periphery of the annular member. When the lugs are inserted in the annular member, the ring is resiliently coupled with the head which can be released from the post only as a result of an upward thrust followed by a rotational displacement through an angle of 45 degrees.