Browse Prior Art Database

Snap Lock Assembly

IP.com Disclosure Number: IPCOM000080802D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Thompson, CG: AUTHOR

Abstract

The keyway-snap tab plastic cover fasteners shown in Fig. 2 can be used to advantage when creating electronic device covers which, for aesthetic reasons, do not have parting lines at their sides. By way of example, the display shown in Fig. 1 must be assembled from four pieces, because the design of the sides, back, top, and front is such that draft is not available to facilitate ejection of a unitary molded cover from a mold. Ordinarily fabrication of such covers from a plurality of parts involves the use of screw fasteners or cement or heat bonding of the parts. Such fastener or bonding assembly methods require substantial labor. Additionally, bonded parts cannot be easily disassembled, if necessary.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 57% of the total text.

Page 1 of 1

Snap Lock Assembly

The keyway-snap tab plastic cover fasteners shown in Fig. 2 can be used to advantage when creating electronic device covers which, for aesthetic reasons, do not have parting lines at their sides. By way of example, the display shown in Fig. 1 must be assembled from four pieces, because the design of the sides, back, top, and front is such that draft is not available to facilitate ejection of a unitary molded cover from a mold. Ordinarily fabrication of such covers from a plurality of parts involves the use of screw fasteners or cement or heat bonding of the parts. Such fastener or bonding assembly methods require substantial labor. Additionally, bonded parts cannot be easily disassembled, if necessary.

Fig. 2 shows a section of the covers of Fig. 1 outlined by the dotted line and rotated 90 degrees to the left, such that side surface 11 is facing down. Top surface 13 appears at the left and back surface 15 appears at the right. In order to assure that surface 17 properly aligns with surface 13 without unsightly gaps or projections, a keyway 19 is provided which accepts molded key projection 21 to provide positive alignment. Top and back surfaces 13 and 15 are molded as one piece and ejected from the mold at a angle such as 45 degrees from each surface. This explains why catches 23 on the inner surfaces on the top and back covers must be trapezoidal in shape.

The side covers can be ejected from a mold perpendicular to surface 11. Locking tabs 25...