Abstract A concealed slide fastener having fastener tapes each carrying along its folded one longitudinal edge a row of fastener elements. The fastener elements are secured to the elementcarrying edge by two needle threads interlooped together with a looper thread at the legs remote from the edge, one of which needle thread is when cross-sectionally viewed vertically extended and passes through a cord within the elements and the other of which is extended obliquely at an angle to the vertical axis towards the fold of the element-carrying edge and hold the fold in place on the coupling region of the elements. The lastmentioned needle thread abuts against an inner periphery of the cord and serves to urge or bias the cord away from the coupling region to maintain a constant clearance thereat required for proper coupling engagement of the two opposed rows of fastener elements.
A concealed slide fastener comprising a pair of opposed stringer tapes each having a longitudinal element-carrying edge inwardly folded on itself; rows of fastener elements secured to respective element-carrying edges, each of said fastener elements having an upper leg portion, a lower leg portion and a coupling head merging into these leg portions, said lower leg portion being provided with a recess for accommodating sewing threads; a filler cord inserted longitudinally in a space defined between said upper and lower leg portions of the fastener elements, and a first and a second sewing thread for securing the row of fastener elements to said element-carrying edge, said first sewing thread passing substantially vertically towards said recess through said filler cord and securing the latter together with the elements to said element-carrying edge, said second sewing thread extending from said recess obliquely at an angle to the vertical axis of the fastener stringer and located immediately adjacent the fold of the respective stringer tape and urging said filler cord away from the coupling region of the fastener elements.
Claim 2
Dependent Claim
176 words
A concealed slide fastener comprising a pair of opposed stringer tapes each having a longitudinal element-carrying edge inwardly folded on itself; rows of fastener elements secured to respective element-carrying edges, each of said fastener elements having an upper leg portion, a lower leg portion and a coupling head merging into these leg portions, said lower leg portion being provided with a recess for accommodating sewing threads; a filler cord inserted longitudinally in a space defined between said upper and lower leg portions of the fastener elements, and a first and a second sewing thread for securing the row of fastener elements to said element-carrying edge, said first sewing thread passing substantially vertically towards said recess through said filler cord and securing the latter together with the elements to said element-carrying edge, said second sewing thread extending from said recess obliquely at an angle to the vertical axis of the fastener stringer and located immediately adjacent the fold of the respective stringer tape and urging said filler cord away from the coupling region of the fastener elements.
Claim 3
Dependent Claim
46 words
A concealed slide fastener as defined in claim 1 wherein each stringer tape is provided on one surface with longitudinally extending alternate wales and interwale grooves, one of which grooves located nearest the fold of the tape is adapted to anchor therein said second sewing thread.