초록 ▼

The invention provides a metal cover frame for an open shaft, adapted to be installed flush with a road surface and connected in a vertically adjustable manner to a concrete frame which is adapted to rest on the upper end of the shaft, the metal frame comprising through holes provided in an inwardly

The invention provides a metal cover frame for an open shaft, adapted to be installed flush with a road surface and connected in a vertically adjustable manner to a concrete frame which is adapted to rest on the upper end of the shaft, the metal frame comprising through holes provided in an inwardly projecting lip of the metal frame, and collects corresponding to the through holes in the metal frame being provided in the concrete frame, the collets being adapted to receive tightening screws penetrating the through holes.

대표청구항 ▼

A metal cover frame for an open shaft, adapted to be installed flush with a road surface and connected in a vertically adjustable manner, to adapt to new road levels when the roadway is resurfaced, to a concrete frame which is adapted to rest on the upper end of the shaft, the metal frame comprising

A metal cover frame for an open shaft, adapted to be installed flush with a road surface and connected in a vertically adjustable manner, to adapt to new road levels when the roadway is resurfaced, to a concrete frame which is adapted to rest on the upper end of the shaft, the metal frame comprising means for holding a cover and having an inwardly projecting lip provided with through holes, collets adapted to receive tightening screws corresponding to the through holes in the metal frame being provided in the concrete frame, and tightening screws penetrating the through holes and received in the collets to secure the metal cover frame to said concrete frame, said inwardly projecting lip provided with integral raising means comprising said tightening screws at the bottom side of the inwardly projecting lip of the cover frame being provided with collars so that the vertical adjustment can be carried out by means of the tightening screws for raising said cover frame in respect to said concrete frame, said raising means being accessible upon lifting said cover.