Automatic locking slider for slide fastener

Abstract

The invention relates to an automatic locking slider for a slide fastener, wherein: in the automatic locking slider, an auxiliary support groove 2b is further formed adjacent to a support groove 2a on a bottom side of a locking lever accommodation groove 2 on which a locking lever 3 is mounted, and an auxiliary support protrusion 3f is further formed on the inner side of a support protrusion 3a formed at the rear part of the locking lever 3; a top surface 3d is formed on an upper end of the support protrusion 3a such that a downwardly-curved part 5a formed at the back of a cover 5 contacts a top surface of the support protrusion of the locking lever, whereby the locking lever can be stably supported in the support groove of the accommodation groove.

Description

TECHNICAL FIELD[0001]The present invention relates to an automatic locking slider for a slide fastener, and in particular to an automatic locking slider for a slide fastener which has features in that a locking lever accommodation part is formed at a central portion of a guide pillar which guide pillar upwardly protrudes from a central portion of an input port of a fastener engaging groove formed at a slider, and a locking protrusion is formed at a front end of the locking lever accommodation part, and a locking lever equipped with a support protrusion is formed at the opposite side, and a fixing cover is covered on the upper surface of the locking lever accommodation part, and a spring is disposed between the cover and the locking lever, by means of which elements the spring supplies pressure to the locking lever, so the locking protrusion is inputted into the fasteners for thereby locking the slider. The locking protrusion can be forced to separate from between the fasteners in su...

AI Technical Summary

Benefits of technology

[0007]According to the present invention, besides the support groove 2a, the auxiliary support groove 2b is further formed at the bottom of the locking lever accommodation groove 2, and besides the support protrusion 3a, the auxiliary support protrusion 3f is further formed at the locking lever 3. With this, when the locking lever is inserted into the locking lever accommodation groove, the support protrusion 3a of the locking lever is inserted into the support groove 2a, and the auxiliary support protrusion 3f is inserted into the auxiliary support groove 2b. When the locking lever 3 is inserted into the locking lever accommodation groove, the insertion can be performed without any movements in all directions, so the front end of the locking lever can ascend and descend stable along the support groove 2a. In addition, at the top of the support protrusion 3a of the locking lever is formed the upper end surface 3d whose outer side is higher and whose inner side is lower. The lower end 5a′ of the downwardly bent piece 5a extending in the direction of the accommodation groove from one side of the cover 5 comes into contact, so with this it is possible to prevent the support protrusion from being lifted up in the support groove when the front end of the locking lever ascends. Therefore, the support protrusion 3a of the locking lever can be stably supported in the support groove 2a, so the upward and downward movements can be stable in place without using an additional support shaft. The plate spring 5b is formed at the bottom of the cover 5, so when it comes into contact with the top of the plate spring contact part 3e of the upper surface of the locking lever, the pressurization is performed so that the elastic force is transferred to the locking protrusion, whereby the front end of the locking lever can always keep the elastic force in the direction of the locking protrusion. As the locking protrusion 3b of the front end of the locking lever is inserted into between the fasteners, the elastic force can be maintained, and then the slider can be locked.

[0008]When the coil spring 6 is disposed at the bottom of the cover 5, the coil spring is disposed between the coil spring contact part 3g of the top of the locking lever 3 and the cover, so the elastic force is kept in the direction of the locking protrusion, whereby the locking protrusion 3b of the front end of the locking lever ascends and descends between the fasteners, for hereby locking the slider. When the locking protrusion of the front end of the locking lever is forcibly lifted up with the pulling tap, the plate spring 5b or the coil spring 6 is contracted, and the locking protrusion 3b of the front end of the locking lever escapes from between the fasteners, by means of which the unlocking operations of the slider can be obtained. When the pulling tap is not lifted up, the locking protrusion of the locking lever is inputted into between the fasteners, so the slider can be automatically locked. In the locking lever accommodation groove, the cover fixing part and the bent piece guide groove are formed in a shape of a cross section of an angle steel, so it is possible to fix the cover whose one end is bent in a shape of a cross section of an angle steel, which results in easier engagements of the cover.

[0009]When manufacturing the slider in the present invention, the opening part of the locking lever accommodation groove 2 is opened to its full, so the mould can be manufactured without any obstacle at the inner all, whereby the mould manufacture becomes easier, and the mould product can be cheap, so the manufacture does not cost a lot. The cover 5 can be made from an elastic material, and the downwardly bent piece 5a and the plate spring 5b can be integrated. In this case, the spring is not necessary. The coil 5 can be disposed between the cover and the coil spring contact part 3g of the locking lever 3, which construction helps easily install the cover, and the spring device can work to its full. The spring is disposed between the inner side of the cover and the locking lever for thereby supplying elastic force to the locking lever, so smooth and precise operations can be obtained. In the present invention, errors can be significantly reduced in the middle of the operations of the slide fastener, thus manufacturing the automatic locking slider.

Problems solved by technology

In the above mentioned conventional art construction, the locking lever does not have a stable operation because the locking lever accommodation groove in which to accommodate the locking lever and the support protrusion and the support groove of the locking lever do not fit precisely, and the construction of the locking lever installed on the inner surface of the slider looks complicated, which results in increased cost for molding.

Besides the above problems, the support part of the locking lever is loosely engaged.

When the slider is forced to move, the locking lever may rattle or may be distorted, which consequently leads to bad locking operations, so errors in operations increase accordingly.

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