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US 6,584,734 B2Granted
Locking ground hole cover
OwnerLarry Mihalicz, Orest Boyachekinventors
Life of this patent
Estimating the term…
Abstract
A locking ground hole cover is disclosed comprising a cover plate with a scissor-type apparatus suspended therefrom which apparatus can be actuated from above the cover plate. The apparatus allows for the locking of a hole by pulling the cover plate down into a sealed locked position with the hole mouth. Variations on the device are disclosed.
Claims25
A locking hole cover for use in a hole, said hole having an opening mouth and walls, said cover comprising:
- a) a cover plate having a lower surface and an upper surface;
- b) a plurality of wall-engaging tensioning arms, each said wall-engaging tensioning arm being hingably attached to said cover plate, the unhinged end of each said tensioning arm, being a wall-engaging end, extending downwardly and away from a center of said cover plate;
- and
- c) a spreading apparatus engaging said tensioning arms such that when said spreading apparatus is moved towards said cover plate the wall-engaging ends of said tensioning arms will be forced outwards, and when said spreading apparatus is moved away from said cover plate said wall-engaging ends of said tensioning arms will be pulled inwards;
- and
- d) a shaft extending downwards from said lower surface of said cover plate and engaging said spreading apparatus such that the movement of the shaft will cause the movement of the spreading apparatus either towards or away from said cover plate.
3 more elements
Dependencies are inferred from the claim text.