Slide fastener

Abstract

In slide fasteners (10, 40, 50), butterfly sticks (31, 51) have portions (31b, 51b) stretching toward box sticks (32, 32', 52), and the difference between the interval (A) between the inner surfaces of right and left flanges (24) at the rear ends of sliders (21a, 21b) and the maximum value (B) of dimension of the butterfly sticks (31, 51) in the tape width direction (interval (A) minus maximum value (B)) is set to satisfy the relation 'the dimension (C) in the tape width direction at a part of the box sticks (32, 32', 52) corresponding to a part of the butterfly sticks (31, 51) having the maximum value (B) < (the interval (A) minus the maximum value (B)) < (element width (D) of the fastener element (15))', the maximun vlue (B) is set to be smaller than the element width (D), a dimension (E) of the area in a tape length direction where the dimension of the separable pins (31, 51) in the tape width direction is larger than the difference between the interval (A) and the element width (D) (interval (A) - element width (D)) is set to satisfy a relationship of '(demension (E)) > (the length of three pitches of the fastener element (15)) minus (the dimension in the tape length direction at a meshing head (15a))*3'. Since the right and left element lines (13) are not meshed intentionally even if the slider (21a) is slid under a state where the butterfly sticks (31, 51) are inserted insufficiently, fall in meshing strength or weakening in meshing strength against a thrust up force caused by incorrect meshing of the right and left element lines can be prevented surely.

Description

technical field [0001] The present invention relates to a slide fastener in which an insertion tube and an insertion box are arranged at the lower end of a dentition composed of continuous elements, and in particular, when the slider is slid in a state in which the insertion of the insertion tube is incomplete, it is possible to prevent left and right A zipper in the case where the dentition meshes incorrectly with each other. Background technique [0002] As a slide fastener for opening and closing the left and right front body parts of clothes, a slide fastener with a separate insert provided with a plug, a plug box, and a box body at the lower ends of the left and right dentitions is widely used. [0003] In the slide fastener with separate inserts, the insertion tube is generally arranged continuously at the lower end of one dentition, and the insertion box is continuously arranged at the lower end of the other dentition. In addition, the slide fastener is configured su...

AI Technical Summary

Problems solved by technology

If the meshing head portion 92a of the fastener element 92 is meshed in a shifted state, the meshing strength of this part will be significantly reduced, so the left and right tooth rows 93 in the meshed state are likely to cause meshing cracks that are opened from this part. , In addition, there is the problem that the dentition 93 becomes weaker with respect to the upward thrust

[0026] In addition, for example, in the case of the slide fastener 71 described in the above-mentioned Patent Document 1, that is, in the case of the slide fastener 71 in which the protruding portion 83 for improving the engagement strength of the end portion of the tooth row 75 is formed on the insertion tube 76, the If the slider is slid without fully inserting the insertion tube 76 into the box body 78 or the pull-down head when the left and right dentition 75 is engaged, then as Figure 17 As shown, there is a problem that the engaging head 73a of the fastener element 73 adjacent to the insertion box 77 enters the underside of the protrusion 83, and the fastener element 73 cannot be engaged in a proper position.

[0027] Furthermore, with regard to the zipper described in the above-mentioned patent document 2, it is also the same. When the left and right dentitions are meshed, if the slider is not fully inserted into the box body or the pull-down head, and the slider is slid, there will be Issue with inappropriate positive engagement of teeth adjacent to intubation box

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