Metal deforming – With cutting – By composite tool
Patent
1990-07-27
1992-04-21
Crane, Daniel C.
Metal deforming
With cutting
By composite tool
72186, 72204, 291636, 29890142, 29897312, B21D 2832, B21D 2834
Patent
active
051056437
ABSTRACT:
That wall of a hollow metallic spacer frame between two spaced-apart parallel window panes separates a supply of partly granular and partly pulverulent desiccant in the interior of the frame from the space which is surrounded by the frame and is flanked by the panes. The wall is formed with a row of nipples extending from its outer side and having tips provided with holes for penetration of vapors from the space between the panes into contact with desiccant. The tips of some or all of the nipples are upset as a result of engagement by a roller so that the cross-sectional areas of the corresponding holes are reduced for the purpose of preventing penetration of pulverulent desiccant into the space while permitting the vapors to escape from the space into the interior of the spacer frame. The nipples are formed by deep drawing the ductile material of the wall prior to upsetting by the roller, and the tool which performs the deep drawing action can also serve to make holes in the tips of the nipples. The peripheral surface of the roller has a circumferentially extending groove bounded by a section of the peripheral surface which serves to upset some or all of the nipples while the roller is caused to roll along that side of the wall which later confronts the supply of desiccant in the interior of the finished spacer frame.
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Crane Daniel C.
Franz Xaver Bayer Isolierglasfabrik KG
Kontler Peter K.
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