An angularly variable device for use on a door having a closer piston with a piston arm wherein the angularly variable device is a protracting blocker comprised of a first section and a second section. Each section comprises a wall from which extends at least one tab extending perpendicularly therefrom. From the wall extends generally perpendicularly at least one but preferably a plurality of tabs so that the at least one tab on each of the first section and the second section rests on top of the piston arm. A retainer presses against an elbow joint forming part of the piston arm so as to firmly press the wall against the piston arm so that one side of the blocker is pressed against one side of the piston arm while the retainer presses against the opposite side of the piston arm so as to provide a secure installation of the blocker on the piston arm. A lever pivoted into a horizontal position presses the two sections together so that they remain in a given fixed position relative to each other so as to immobilize the piston arm in a given position.

Provided is a stay which is capable of stabilizing movement of a component part used for transmitting, or not transmitting, the torque of one of a first member and a second member to the other. When a second member rotates relative to a first member in one direction, a cam base moves away from a disk in the direction of the rotation axis, and the second member and the cam base rotate relative to the first member and the disk. When the second member rotates relative to the first member in the opposite direction, the cam base moves towards the disk in the direction of the rotation axis, and the second member, the cam base and disk rotate relative to the first member with resistance force.