Abstract: This invention relates to a rung for a cable ladder which comprises at least one orifice for passage of an attachment member to an upright and two elements in relief disposed on each side of this orifice and adapted to be engaged in an oblong perforation in the upright in which the attachment member is received. In the case of an upright, it is the upright which bears the orifice and the elements in relief adapted to be engaged in an oblong perforation in the rung. A cable ladder according to the invention is easier to assemble due to the self-centering obtained, and the screws or rivets used for attachment are subjected to less shear.

Abstract: A device for securing brackets on an upright member wherein the upright member includes two spaced flanges having ends bent inwardly to form curved end portions defining an opening therebetween. Each curved end portion includes a series of notches forming a rack over the length of the upright member. At least one bracket is provided which includes opposite end spaced retaining members which cooperate with the curved end portions, the notches and the continuous opening of the upright to retain the at least one bracket to the upright member.

Abstract: A mechanism for detecting an obstacle preventing the proper operation of a sectional shutter of a warehouse-type door which includes a detection member mounted in the vicinity of a horizontal shaft around which the sectional shutter is wound by the operation of a motor. The detection mechanism is connected to a switch for controlling the motor and thus the rotation of the horizontal shaft about which the sectional shutter is wound. The detection member consists of at least one member which extends adjacent to but spaced from the horizontal shaft and which is engageable by a slack portion of the sectional shutter caused by the engagement of an obstacle with the sectional shutter as it is being lowered.

Abstract: A cable way composed of welded trelliswork which includes U-shaped transverse wires having lateral branches with the outer ends bent outwardly to form a hook and wherein at least one marginal wire is welded inside the formed hooks.

Abstract: At least two portions of a cableway are joined in end to end relationship by engaging first and second fish plates along the inner surfaces at the joint of the cableway portions. The fish plates abut corresponding arms of each cableway portion and are retained by engagement with a step formed in a web which extends between the arms of each cableway portion and with a rib which depends from a flange associated with each portion of the cableway. A cover and stirrup clips to lock the cover to the cableway portions are also disclosed.