| 摘要 |
<p>A coil-shaped fastener element (2) is comprised of a coupling head (4) bulging to both sides, upper/lower leg portions (5, 6) adjacent the coupling head (4) and a connecting portion (7) for connecting the upper and lower leg portions (5, 6). With providing a stepped portion (8) in a center of the upper leg portion (5), a portion of the fastener element (2) on a side of the coupling head (4) is formed thick while a portion thereof on a side of the connecting portion (7) is formed thin. A coupling space (9) is provided between the upper and lower leg portions (5, 6). A protruded portion (10) protruded into the coupling space (9) is provided in a back of the stepped portion (8) of the upper leg portion (5). A slope portion (12) is formed such that the coupling space (9) is expanded from an inside of an upper portion of the coupling head (4) to a base portion (11) of the protruded portion (10). A core thread (28) is inserted between the upper and lower leg portions (5, 6) and sewed using a sewing yarn (15) of multi-thread chain stitches as fixing yarn (14), such that a side edge of the core thread (28) is protruded toward the coupling head (4). Upon coupling, the coupling head (4) is allowed to be inserted quickly along the slope portion (12) and an excessive insertion of a mating coupling element is prevented by the protruded portion (10) and core thread (28) so as to stabilize the coupling. Thus, the linear slide fastener enables a smooth and quick coupling operation. <IMAGE></p> |
