Patent ID: 6550294
Filing Date: 2003-04-22
Classification: E02D,Y10T

Abstract:
In an apparatus for a security device for attachment to the entrance into a manhole tube, the manhole tube having a manhole ring with a flange thereon and a manhole cover, the flange having a top surface and a bottom surface, the improvement comprising:a) a disk member, said disk having a top side and a bottom side, said disk complementarily sized to fit on the top of the flange of the manhole ring, said disk having a centrally located aperture therein; b) a pair of shafts, said shafts being oppositely disposed shafts disposed on the bottom surface of said disk member, said shafts being generally horizontally disposed, whereby the ends of the shafts contact the manhole ring so as to secure the disk member in the manhole tube, each shaft having a first end and a second end, said first end being rotatable and said second end having a pointed tip, said tip contacting the manhole ring so as to secure said disk member in the manhole tube; c) means for urging said pair of shafts apart from each other so that said shafts contact the manhole ring so as to secure said disk member in the manhole tube; d) a turnkey, said turnkey passing through said aperture in said disk to cooperate with said means for urging said shafts apart, said turnkey having a handle end and a interlocking end; e) said means for urging said shafts apart further comprising a double bevel gear drive assembly disposed so as to cooperate with said turnkey interlocking end so that said shafts are urged apart when the turnkey is turned f) a downwardly extending U-shaped bracket disposed on said bottom surfaces of said disk, said double bevel gear drive assembly being disposed on said U-shaped bracket; g) said first end of each of said shafts having a bevel gear attached thereto so that said shafts rotate with said bevel gear; h) said double bevel gear drive assembly further comprising a turnkey driven gear drive; i) a keyway bracket disposed on said bottom surface of said disk, said keyway bracket having a keyway aperture therein, said aperture for receiving said second end of each of said shafts; j) said second end of said shafts further comprising a non-rotational slidable locking member disposed thereon, said non-rotational slidable locking member having a means for connection to said second end of each of said shafts whereby said locking members move apart as said shafts rotate, said locking member having a first end and a second end; and k) said means for connection further comprising a set of male threads on said second end of said shafts and a set of mating, female threads on said first end of said non-rotational locking member so that said locking members move apart as said shafts rotate.