| 摘要 |
An improved hack saw in which a compression tube together with two parallel adjustable tension rods comprise the main horizontal frame assembly. The compression tube having an inside vertical dimension several times greater than the diameter of the tension rod is held in place by bosses extending from the front side of the handle and the rear side of the blade support arm. One compression rod is located above and parallel to the compression tube. The second rod is positioned inside and at the lower vertical extremity of the compression tube. Tension applied to the rods by means of threaded nuts on the front of the blade support arm applies compression to the compression tube resulting in a frame assembly highly resistant to bending moments and distortion.
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