referring to fig1 , and 3 , an interlocking tab of a zipper according to the present invention comprises two rows of engaging teeth 1 and a cloth tape 2 1 o associated with the engaging teeth 1 . wherein , the engaging teeth 1 is conventional and each row of the engaging teeth 1 is made by way of nylon filament , polyester filament , or other polymeric filament being curled to form a continuous coil shape as the preceding description does . the engaging teeth 1 can be provided with suitable flexure of bending based on the property of the material itself to cope with the requirement of processing a curve shape . because , this is a conventional art and no further detail will be described . the difference between the present invention and conventional tooth tab resides in that the cloth tape 2 shown in fig2 is provided with a plurality of side openings 21 . each side opening 21 can be made as a pierced through aperture or a detached spot instead . the side openings 2 preferably are equally spaced apart to one another and line up to constitute two parallel rows of side openings 21 . in practice , the side openings 21 can be located near the respective lateral edge of the interlocking tab without breaking the lateral edge as shown in fig1 or breaking the lateral edge into sections as shown in fig2 . furthermore , the side openings 21 can be holes formed by way of punching or tears formed by way of stamping and the cloth tape 2 can be made of the polyester or chemical fiber in order to damage the fiber structure for loosening the yam in the cloth tape 2 . if the cloth tape 2 is made from polyester or blending , the formation of the side openings 21 can be performed by way of the supersonic wave , sintering or heat melting such that the cloth surrounding the side openings 21 may solidify or be in a state of maturing to prevent the yarn from loosening . fig4 shows reference shapes of side openings 21 possible to be made in practice , and these shapes are for taking examples and not for limiting the technical scope of the present invention . that is , other shapes of side openings 21 are still in the technical scope of present invention . moreover , the side openings 21 may be preset during the strip being processed . referring to fig3 in case of a curve work being conducted for the cloth tape 2 , the side openings 21 make the cloth tape 2 extend outward to compatible with the bent engaging teeth 1 and then be positioned after sewing such that the zipper can be formed with a curve . in addition , it is possible make the curve smoother through a step of vapor setting . it is appreciated that the present invention has broken through the bottleneck with regard to the working of curve zipper to solve a problem of the conventional zipper . therefore , it leads to a wider scope of designing a zipper and this is an advantage not possible for the conventional zipper to reach . while the invention has been described with reference to preferred embodiments thereof , it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention , which is defined by the appended claims .
an interlocking tab of a zipper , comprises two rows of engaging teeth and a cloth tape surrounding the engaging teeth . the cloth tape at both lateral edges thereof provides side openings respectively .