Abstract: A rope traction device has locking units that include a sheave on which a traction rope is wound. The rope traction device is adapted to be moved along with the traction rope and includes a traction rope inlet for feeding the traction rope to the sheave a traction rope outlet for feeding out the traction rope, a traction rope locking device for locking the traction rope when an increase in the speed of the traction rope is detected, and an auxiliary rope locking device provided in the vicinity of the traction rope inlet for detecting relative moving speed of an auxiliary rope suspended from the rope traction device. An interconnection is provided between the traction rope locking device and the auxiliary rope locking device in order to provide simultaneous engagement of the separate locking devices.

Abstract: A rope traction device includes a sheave having an annular rope receiving groove and being driven and rotated with a traction rope received in the rope receiving groove to cause the traction rope to be wound on the sheave and the rope traction device thereby moves along the traction rope. The sheave includes a pair of side walls made of an elastic material and formed integrally with the sheave for formaing the rope receiving groove. The interval between inner surfaces of the side walls in a rope holding portion is made smaller than the diameter of the traction rope by a predetermined value. The rope receiving groove may be formed in a U-shaped section, a V-shaped section or a section which is a combination of the U-shaped section and the V-shaped section.

Abstract: A rope traction device includes a sheave having an annular rope receiving groove and being driven and rotated with a traction rope received in the rope receiving groove to cause the traction rope to be wound on the sheave and the rope traction device thereby moves along the traction rope. The sheave includes a pair of side walls made of an elastic material and formed integrally with the sheave for formaing the rope receiving groove. The interval between inner surfaces of the side walls in a rope holding portion is made smaller than the diameter of the traction rope by a predetermined value. The rope receiving groove may be formed in a U-shaped section, a V-shaped section or a section which is a combination of the U-shaped section and the V-shaped section.

Abstract: A rope traction device includes a sheave having an annular rope receiving groove and being driven and rotated with a traction rope received in the rope receiving groove to cause the traction rope to be wound on the sheave and the rope traction device thereby moves along the traction rope. The sheave includes a pair of side walls made of an elastic material and formed integrally with the sheave for formaing the rope receiving groove. The interval between inner surfaces of the side walls in a rope holding portion is made smaller than the diameter of the traction rope by a predetermined value. The rope receiving groove may be formed in a U-shaped section, a V-shaped section or a section which is a combination of the U-shaped section and the V-shaped section.

Abstract: A work apparatus for a work on a wall surface of a structure, e.g., a building, comprises rail supports secured fixedly to an upper end portion of a structure, upper provisional horizontal rails supported provisionally on these rail supports, lower provisional horizontal rails mounted provisionally on a lower portion of a wall surface of the structure in parallel with the upper provisional horizontal rails, upper horizontally running trolleys mounted slidably on the upper provisional horizontal rails and connected to one another, a working platform, e.g.