MECHANISCHE LOESEEINRICHTUNG FUER EINEN FEDERSPEICHERBREMSZYLINDER

A mechanical release arrangement for a fluid-pressure-operated braking cylinder having an emergency brake/parking brake feature includes a cylinder housing having formed therein a brake actuation portion, an emergency portion, an intermediate lever portion, and a coaxially-disposed brake-release arrangement interacting therewith. An actuator piston is movable within one pressure chamber and has a hollow rod portion extending therefrom on which the lever arrangement is secured. An emergency piston is retracted to a release position against the force of a spring arrangement by fluid pressure communicated to an emergency chamber. An extension sleeve extends from the emergency piston and has a first toothed portion formed at one end. A release rod extends through the extension sleeve and has a second toothed portion formed near a reduced diameter end. An annular collar formed at the middle of the release rod contacts the hollow rod portion to transmit emergency braking force to the lever arrangement thereby when the first and second toothed portions are in an abutting contacting engagement. To release the brake following an emergency application, a release body can be activated to rotate the release rod such that the first and second toothed portions align in a mated position allowing independent relative movement between the release rod and emergency piston. A restoring arrangement returns the release rod to the original position upon repressurization of the emergency chamber.