Transcription of Snap-Fit Book Final 11-05
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Snap-Fit Book Final 11-05
3 The illustration above shows a photograph oftwo Snap-Fit models taken in polarizedlight; both have the same displacement (y) and deflective force (P).Top:The cantilever arm of unsatisfactorydesign has a constant cross section. The non-uniform distribution of lines (fringes)indicates a very uneven strain in the outerfibers. This design uses 17% more materialand exhibits 46% higher strain than the opti-mal :The thickness of the optimal Snap-Fit arm decreases linearly to 30% of the orig-inal cross-sectional area. The strain in theouter fibers is uniform throughout the lengthof the Common features Types of snap joints Comments on dimensioningBCantilever Snap Joints Hints for design Calculations Permissible undercut Deflection force, mating force Calculation examplesCTorsion SnapJoints Deflection Deflection forceDAnnular SnapJoints Permissible undercut Mating force Calculation exampleEBoth Mating PartsElasticFSymbolsContentsP
• The reflector catches at three points on the periphery. Either a snap-fittin hook 3a or a pressure point 3b may be chosen here, so that there is polygonal deformation of the inner ring of the housing. • The lens in the front door is either pro duced in the second of two moldings 4a or, if a glass lens is desired, this can be
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