Patent ID: 7665194

Claim:
A slide fastener with a slider locking mechanism having a pair of right and left fastener stringers in which element rows are attached to opposing tape side edge portions of a pair of fastener tapes and a slider, through which the element rows are inserted, the slider comprising a slider body in which element guide passages are formed between an upper blade having at least one window portion and a lower blade; a tab attached rotatably to a top face side of the upper blade; at least one locking pawl which is formed integrally on the tab and projected into the element guide passages through the at least one window portion in the upper blade to be capable of fitting into between elements constituting the element row, and locking means for stopping a rotation of the tab toward a rear mouth side of the slider at a rotation limit of the tab, the locking pawl having at least one pawl portion to fit into between the elements, wherein a first contact surface configured for contacting a first element of the element rows is formed on a front face of the at least one pawl portion, and a second contact surface configured for contacting a second element of the element rows adjoining the first element in a rear side direction is formed on a rear face of the at least one pawl portion, the rear face being on a side of the at least one pawl portion that is opposite to the first contact surface; the first contact surface comes into contact with the first element of the element rows so as to temporarily stop a free rotation of the tab under a weight of the tab toward a rear mouth side of the slider; a second contact surface comes into contact with the second element of the element rows so as to stop a forced movement of the slider when the pawl portion is fitted between the first and second elements, and the locking means is configured to stop the free rotation of the tab at its rotation limit and the forced movement of the slider when the forced movement of the slider occurs while the second element remains in contact with the second contact surface.