Abstract: The present invention provides a tow bar assembly, which may be retrofitted to a dolly while maintaining convenient space saving properties of permanently fitted tow bars. The novel tow bar assembly includes a tow bar, a shaft and a biasing member, such as a spring, biasing the tow bar towards an upright orientation about an axis of revolution. The shaft has a first end and a second end, which opposes the first end. The shaft connects the tow bar to the dolly from the ends so as to provide rotation of the tow bar in respect to the dolly about the axis of revolution. The shaft features an inner cavity, which extends along the axis of revolution. The biasing member is arranged into the cavity of the shaft and rotationally secured thereto. The shaft also features a first end plug at the first end of the shaft for enclosing the biasing member to the cavity. The first end plug rotationally locks the biasing member to the dolly.

Abstract: A collecting cage has a front end to which at least one door is pivoted with the aid of a pivoting device. The cage also has at least three lateral walls. The pivoting device is adapted to pivot the door to an opened position and to a closed position thus covering at least part of it. The pivoting device is adapted to guide the door in an opened position to a direction parallel to a lateral wall and at a clearance therefrom for flanking the cage. The pivoting device includes at least two angle members connected to the door at a distance from each other and having a first portion protruding from the door and having a second portion in an angled position relative to the first portion, and at least two corresponding rails connected to a lateral wall.