Sewer pipe cover assembly

Abstract

A cover assembly for a sewer vent pipe having a dome-shaped cap member with a plurality of brackets affixed to the inner surface thereof and extending to surfaces in a common plane for supporting the cap upon the open, upper end of the sewer pipe. A circular support plate is fixedly attached to the surfaces of the brackets and has a central opening for loose passage of a screw a first plurality of additional openings having centers lying on a circle concentrically surrounding the central opening, and a second plurality of additional openings. The screw is threadedly engaged with a tapped opening in a spreader plate. A plurality of lock arms extend through corresponding ones of said first plurality of additional openings. Each lock arm has an edge engaged in a notch in the periphery of the spreader plate, inhibiting rotation thereof. A screwdriver may be inserted through an opening in the cap to engage the head of the screw and impart rotation thereto, thereby causing the spreader plate to travel axially on the screw and to move foot portions of the lock arms outwardly and inwardly with respect to the screw axis by camming action. In operation, the cap is placed over the end of the vent pipe, in spaced, surrounding relation thereto, with the brackets resting on the upper end of the pipe. A screwdriver is inserted through an opening in the cap and engaged with the screw head. The screw is rotated to move the spreader plate upwardly and the lock arms outwardly into frictional engagement with the inside of the pipe. In order to remove the cap, the screwdriver is again inserted and the screw is rotated in the opposite direction, moving the spreader plate downwardly and the lock arms inwardly, away from the pipe. Thus, the cap may be easily installed and removed, but only by those familiar with its structure.