rope 26 is used to having the descender on a structure such as a building wall each bar is provided with a second hole 22 in which a belt 24 is held the reference numeral 25 designates a descending rope carried on the pulley 3 in operation one end of the descending rope 25 is fastened to the structure such as a building wall and the escaper secures his body to the belt 24 so as to allow him to hang thereon at this stage the bars 16 are urged downward about the pivots 17 by the escaper 39 s weight this movement causes the links 15 to rise thereby urging the brake shoe 14 into contact with the outer peripheral surface of the brake disc 13 in this way the brake disc 13 and accordingly the pulley 3 are stopped from rotation the descending action stops then the escaper holds the handles 21 and pulls them downward the bars 16 are lowed down about the pivots 17 thereby causing the links 15 to lower in this way the brake shoe 14 comes out of contact with the brake disc 13 the brake disc 13 and the pulley 3 are enabled to rotate thereby letting out the descending rope 25 when the descending speed is too fast the pulley 3 and accordingly the planet gear 5 rotates fast this makes the sun gear 7 rotate at an equally increased speed thereby causing the braking shaft 8 to rotate in this way the radial plates 10 are rotated through the rotation of the sleeve 9 thereby causing the brake shoe 12 to rotate along the inner surface of the brake drum 11 while in fast rotation the brake shoe 12 comes.