Composite preset block for underfloor wire distribution systems

DETAILED DESCRIPTION Briefly described, the present invention provides a method and low cost means for adapting a poured concrete floor for connection of outlet boxes as desired.
The invention involves the use of a preset composite block assembly including a block formed of a material which is thermally insulating and non-combustible, and a hold-down cover plate extending over at least the top surface of the block, and preferably at least two opposed ends in addition, which is used to fasten the block on the floor duct system in a position such that the block covers one or more access apertures in the raceways of the floor.
The hold-down plate is provided with an access opening, in which there is preferably inserted an easily removable cover cap.
The block is composed of an easily rupturable material which permits it to be readily removed through the hold-down plate, by tearing or breaking the exposed surface of the block and removing the pieces through the access opening.
The function of the block is to create a void in the set concrete through which the necessary components and connections for completing the outlet installation can be made.
Since it is possible that the block may remain permanently in the floor, the block material should be compatible with permanent disposition in the concrete floor.
The addition, in order to maintain the thermal and fire resistant properties of the floor, the block should not deteriorate over a long period of time.
Suitable materials for making the block include fiberglass, mineral board, gypsum board, foamed plastics, and other easily ruptured foamed or fibrous materials which are insulating and fire-resistant.