| 摘要 |
A spreader for building purposes, e.g. for bracing between shuttering, has two thrust faces help apart by an adjustable central support. This can be a simple shaft threaded at each end with opposite threads and screwed into corresponding sleeves (2) on the backs of the thrust faces. A central grip (1) enables the shaft to be rotated to set the spacing.- DETAILED DESCRIPTION - An alternate design uses wedges to set the spacing with the wedges held by spring grips. The spreader can be adjusted in situ
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