Cable holder having relatively rotatable parts

Claim 1

A holder for a flexible power supply cable, comprising a pair of sleeves disposed end-to-end and having a common central axis, at least one of said sleeves being rotatable about said axis relative to the other, first and second means fixedly mounting the cable respectively on the inner walls of said sleeves, a guide ring mounted on said other sleeve and extending into said one sleeve, said guide ring defining a uniform annular space with said inner wall of said one sleeve, first cable support means on said guide ring extending transversely into said annular space over at least a part of the circumference of the ring at one side of said first cable mounting means on said other sleeve, and second cable support means on said guide ring being axially spaced from said first cable support means and extending transversely into said annular space over at least a part of the circumference of the ring at the other side of said first cable mounting means on said other sleeve; the cable forming a loop between said first and second mounting means in said annular space, said loop having a lower cable portion, an upper cable portion running parallel to said lower cable portion and an arc portion between said lower portion and said upper portion, said lower cable portion being supported on said first cable support means and a variable length of said upper cable portion being supported on said second support means whenever said second cable mounting means of said rotatable sleeve during rotation of said sleeve is at said other side of said first mounting means, the length of said lower portion and of said upper portion of the cable being increasing and decreasing respectively and vice-versa during rotation of said one sleeve with the sum of the lengths of said lower and upper portions respectively being constant and equal to the required range of rotation.