Hole locking device

Static structures (e.g. – buildings) – With entrance for persons or objects in horizontal or...

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Details

404 25, E02D 2914

Patent

active

059791179

ABSTRACT:
A safety hole cover particularly useful in providing temporary protection for drilled and augured holes has a flange portion which is placed on the ground surrounding the hole. This flange portion has a circular opening through it; and the diameter of this opening is at least as great as the diameter of the largest hole to be covered by the hole cover. A domed housing fits over the opening in the flange, and telescoping cylindrical sections are located within the housing. The external diameters of the telescoping cylindrical sections are selected to correspond to the internal diameters of different holes with which the device is to be used. The lowermost (and smallest) cylindrical section has retractable fingers or spikes in it for extension outwardly from the side of the section to engage the side walls of a hole when the device is in place over the hole. The housing provides a visible indication of the presence of the device; and by locking the device in place, removal by vandals is inhibited. The cylindrical sections also protect the integrity of the hole by reducing the potential for collapse of the hole.

REFERENCES:
patent: 3426659 (1969-02-01), Clarke
patent: 4101154 (1978-07-01), Kagstrom
patent: 4974992 (1990-12-01), Harter
patent: 5052851 (1991-10-01), Frishauf
patent: 5328291 (1994-07-01), Wisniewski
patent: 5403116 (1995-04-01), Brewer

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