Automatic brake resetting device

In an automatic brake resetting device particularly for brakes of railway vehicles the combination of a non-rotatable sleeve axially displaceable in the braking direction in response to a braking force and having abutment means thereon, an axially displaceable non-rotatable threaded shaft co-axially disposed within said sleeve, a coupling nut threaded upon said shaft and capable of rotary and axial movement thereon, means on said sleeve for defining a first rotary coupling with one side of said coupling nut and a second rotary coupling with the other side of said coupling nut, said rotary couplings being actuable by axial displacement of said coupling nut, a stop ring traversing said coupling nut and axially displaceable thereon, a fixed first stop to support said stop ring opposite to the braking direction, a second stop on said coupling nut spaced in the direction opposite to said braking direction relative to said first stop a distance approximately equal to the contact stroke of the vehicle brake when the brake resetting device is in the inoperative position, and spring means between said abutment means and said stop ring to act continuously upon said sleeve in the braking direction and to act on said stop ring opposite to the braking direction.