Length adjusting device for fastening straps of mask

Abstract

A length adjusting device for fastening straps of a mask includes an oblong elastic thin plate with a plurality of stepped hook portions. One strap of fastening straps of the mask is to be detachably fitted at a base end portion of the elastic thin plate and another strap of the mask is to be engageably fitted on the stepped hook portions. The elastic thin plate may have a piercing hole at its base end portion, into which the strap of the mask is to be detachably fitted, and / or have opposing hook portions which opposingly project from both its upper and lower sides and incline toward the base end of the elastic thin plate. The piercing hole may have a cut and the cut may extend slantingly toward a tip side of the elastic thin plate.

Description

technical field [0001] The present invention relates to a length adjusting device for tightening straps of various face masks, especially for dust masks, where it is required to reduce the gap between the mask and the wearer's face in order to prevent harmful substances such as dust. intrusion of substances. Background technique [0002] Such as Figure 10 and 11 A conventional mask of the type shown is provided with a mechanism for adjusting the length of the strap 12 at the mating portion of the strap 12 and the mask 11 . This adjusting mechanism comprises the protruding part 13 that is respectively arranged on the upper part and the lower part of the both sides of the edge part of mask 11, and it each has a through hole 16 that has the notch 15 that extends from guide groove 14 and has a Stops 17 for the inlet and outlet 17 a on both sides, which span the gap 15 . The end of the tightening band 12 of the mask 11 is inserted into the through hole 16 from below, stretche...

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the conventional adjustment mechanism of the mask tightening belt is complicated in structure, difficult to manufacture, and thus the manufacturing cost is very high, and these are problems to be solved

In addition, the complicated structure makes it inconvenient to adjust the tightening strap 12 to an appropriate length

Therefore, although the space between the mask 11 and the wearer's face can be narrowed, there is still a problem to be solved; that is, the tightening strap 12 may be tightened too tightly or too loosely for a comfortable fit.

[0005] It is not enough to just add the engaging part 18 to the adjustment mechanism of the strap of the mask to adjust the strap to the proper length

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