DESIGNING PLASTIC PARTS FOR ASSEMBLY Machinery's Handbook, 31st Edition
597
2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.4 0.6 0.8 Proportionality Constant K for Tapered Beams
Straight Beam
L
Y (Maximum Deflection) Tapered Beam
h o
K
L
1.0
Y (Maximum Deflection)
h L
h o
h L / h o
Fig. 20. Snap-Fit Designs for Cantilever Beams with Rectangular Cross Sections
Moving Mold Half
Fixed Mold Half
Fixed Mold Half
Moving Mold Half
(a)
Sliding Core Forming Undercut on Flexible Finger
(b)
Projection from Moving Mold Half Interacts with Fixed Mold Half to Form Undercut
Fig. 21. (a) Arrangement for Molding an Undercut on the End of a Flexible Finger Using a Sliding Core; (b) With the Undercut Formed by a Mold Projection, the Sliding Core is Eliminated
Snap-On Fit
Pronged Snap-In
Prongs
Fig. 22. Examples of Snap-In and Snap-On Arrangements
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