Abstract: The present invention discloses a fiber surface treatment composition, characterized in that the composition is comprised of a silane coupling agent, a polymer and a water repellent agent, wherein the polymer is a copolymer of a polyurethane/acrylic acid polymer, wherein the acrylic polymer is selected from the group consisting of polyacrylic acid, polyacrylates or acrylic acid-acrylic acid ester copolymers. The invention also discloses an insulating fiber having the composition on its surface, the preparation method for it, and an insulating yarn and an insulated cord. The insulated fibers, yarns and ropes of the invention have the advantages of moisture resistance, washing resistance, ultraviolet aging resistance and the like. Particularly, the insulated ropes can be applied to the charging work of transmission lines, especially the UHV transmission lines.

Abstract: The present invention discloses a fiber surface treatment composition, characterized in that the composition is comprised of a silane coupling agent, a polymer and a water repellent agent, wherein the polymer is a copolymer of a polyurethane/acrylic acid polymer, wherein the acrylic polymer is selected from the group consisting of polyacrylic acid, polyacrylates or acrylic acid-acrylic acid ester copolymers. The invention also discloses an insulating fiber having the composition on its surface, the preparation method for it, and an insulating yarn and an insulated cord. The insulated fibers, yarns and ropes of the invention have the advantages of moisture resistance, washing resistance, ultraviolet aging resistance and the like. Particularly, the insulated ropes can be applied to the charging work of transmission lines, especially the UHV transmission lines.

Abstract: A low voltage distribution system comprises a two-conductor track of which one conductor is an outer conductor formed by its casing and the other conductor is an inner copper strip held by insulation. An adaptor can be fitted anywhere along the track and interlocked by closing pivoted members so that portions displace resilient arms outwardly to interlock lips of the adaptor with lips of the track. A fully rotatable contact assembly includes a center contact inside a sleeve contact as well as a lamp bracket which rotates as one with the contact assembly so that wires to the lamp never get twisted. For ease of mounting, a fixing device comprises a rotatable member which can be mounted to a support by a center screw and having a slot or opening to receive a connecting piece which is slidably connected to the back of the track casing by undercut tongue and groove.

Abstract: A distribution bus 12 comprises a conductor sheet 16 and another electrode 18 separated by an insulating sheet 20 of foamed plastic or foamed glass, or by air.A jack plug 14 can be plugged in anywhere on the bus 12 by poking a contact pin 44 through a hole 64 in the conductor sheet 16 to contact the other electrode 18, and poking a contact sleeve 46 through the same hole 64 to contact the conductor sheet 16. The jack plug 14 is clipped to the bus 12 by clips 62 which are pushed through other holes 64 in conductor sheet 16 and are cammed by a rotatable wheel 28 into operative position.

Abstract: A power switching device especially for use by handicapped persons for remote power switching by an operator of available appliances, comprising a touch sensor producing a first signal and a second signal with a successive touch, cycling control means including a clock oscillator responding to the first signal to cause identified display of the appliances in continuing sequence, and a circuit responding to the second signal to halt identifying the sequence at a selected display and to switch power to the appliance corresponding to the selected display either on if not already on or off if already on.