closed frame

closed frame

[¦klōzd ¦frām]
(mining engineering)
A mine support frame that is completely closed; especially in inclined shafts, it is used to protect all sides from rock pressure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Similar to the Viper Elite SD, the Specialist SD also offers maximum security with its closed frame with the addition of a full sized platform.
The Smart Weigh Belt is now available in both 300 and 600mm belt width and in open and closed frame versions.
It features a cast iron closed frame and Winisip programming software, which can import IGES, UNISURF, SET, and VDA files from any CAD system.
The bed and closed frame assembly sit on a three-point support that forms a rigid structure.