Tensioning of metal wires

Claim 1

A device for holding under tension a length of wire having not more than two strands, said device comprising a body having parallel planar ends and having a first passage extending therethrough substantially normal to said ends, said first passage receiving the wire, said body further having a single second passage extending therethrough and having one end opening to a zone of intersection with said first passage, said second passage having an angle of intersection less than 15° with said first passage, a single locking member located in said second passage, a spring urging said locking member towards said zone of intersection, means at the other end of the second passage for retaining said spring in said body, said locking member and said second passage having a larger cross-sectional size relatively to a cross-sectional size of said first passage whereby said locking member cannot enter any part of said first passage except a part included in said zone of intersection, said locking member having a body of revolution about an axis and arranged to roll thereabout along said second passage and, on attempted withdrawal of the wire in one direction from said body, to lock between the wire and a surface of said second passage to prevent such withdrawal; said second passage terminating at said zone of intersection in a stop surface of said body inclined at an angle greater than 15° to a surface of said first passage on which the wire bears when locked and positioned so that said locking member, when engaging said stop surface, obturates only a part of said first passage, said body having a third passage to receive a further length of wire, said third passage being substantially parallel to said first passage and having a cross-section to accommodate with clearance another length of wire of the same cross-section as the length of wire to be received in said first passage.

Claim 2

A device for holding under tension a length of wire having not more than two strands, said device comprising a body having parallel planar ends and having a first passage extending therethrough substantially normal to said ends, said first passage receiving the wire, said body further having a single second passage extending therethrough and having one end opening to a zone of intersection with said first passage, said second passage having an angle of intersection less than 15° with said first passage, a single locking member located in said second passage, a spring urging said locking member towards said zone of intersection, means at the other end of the second passage for retaining said spring in said body, said locking member and said second passage having a larger cross-sectional size relatively to a cross-sectional size of said first passage whereby said locking member cannot enter any part of said first passage except a part included in said zone of intersection, said locking member having a body of revolution about an axis and arranged to roll thereabout along said second passage and, on attempted withdrawal of the wire in one direction from said body, to lock between the wire and a surface of said second passage to prevent such withdrawal; said second passage terminating at said zone of intersection in a stop surface of said body inclined at an angle greater than 15° to a surface of said first passage on which the wire bears when locked and positioned so that said locking member, when engaging said stop surface, obturates only a part of said first passage, said body having a third passage to receive a further length of wire, said third passage being substantially parallel to said first passage and having a cross-section to accommodate with clearance another length of wire of the same cross-section as the length of wire to be received in said first passage.