E - Fixed Constructions – 02 – D
Patent
E - Fixed Constructions
02
D
E02D 29/14 (2006.01) E05B 17/00 (2006.01) E05C 9/06 (2006.01)
Patent
CA 2108987
ABSTRACT An improved locking feature for a water- tight hatch incorporates a positive break-open feature to facilitate opening when the hatch is jammed with ice and/or debris. A plurality of radially extending/retracting locking bars cooperate with closing cams such that, when the bars are extended, the hatch is drawn into tight engagement with a sealing gasket. When the locking bars are fully retracted, in order to release the hatch for opening, at least selected ones of the locking bars coop- erate with opening cam means whereby full retraction of the bars forcibly displaces the hatch in an opening direction with a high mechanical advantage, initially breaking the hatch free of any restricting ice formation or packed debris. Thereafter, the hatch may be readily opened by being manually lifted in a conventional manner. The arrangement makes it entirely feasible to configure the hatch cover to be flush with its surroundings, so as to be useable in sidewalks, for example, where there may be heavy pedestrian traffic.
Carlson Edward R.
Elwell Robert
Fetherstonhaugh & Co.
Presray Corporation (the)
LandOfFree
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