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Sydney Richard Stone
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Individual
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Underground Structures, Protecting, Testing And Restoring Foundations
(AREA)
Abstract
3206. Stone, S. R. Feb. 16. Man-hole and hand-hole doors and frames.- Covers are provided with T-headed lifting-handles a<1>, which, when out of use, drop into pockets c cast in the cover, and lie flush with the surface. Finger-grooves b<1> allow the handles to be raised, the upward motion being limited by the abutment of the stops e on the cross-bars d. The handles and cross-bars may be assembled in the sand and the metal of the cover cast round them.