| 摘要 |
The box (4) has walls (5,6) and a base (8) with one or more tubular casings (9) mounted on the base. The casing is hollow and as long as the width of the box. The casing has tongues or lips on the inner wall to receive the cone (10) or spacer that can be attached to it. The casing may also have a bevelled edge.The tubular casings may be clamped or clipped to the base of the box, alternatively screws or a temporary weld may be used. The box is held in place by casing and cone between two shuttering panels (1,2). The box is first fixed to one shutter, and the second shutter is positioned at the end. The thickness of the device equals the required distance between the two shutters.
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