Telescopic manhole and storm drain installation

A telescopic manhole and storm drain installation including:

• a riser assembly having an upper section adjacent a lower section and defining an interior passageway therein,
• said upper section having a side wall terminating in opposite top and bottom portions,
• said side wall inclined upwardly and outwardly from said bottom portion to said top portion and defining substantially an inverted frustoconical configuration,
• said lower section including a circular wall extending in a vertical plane and provided with external threads thereon,
• a lid removably attachable to said side wall top portion and spanning said interior passageway, said lid circular in plan view and including a body having upper and lower portions, threads on said body upper portion,
• said body lower portion having an unthreaded side wall and a downwardly facing dome-shaped concavity whereby, compressive loads applied to said lid are transmitted through said body lower portion to said unthreaded side wall and against said riser assembly upper section side wall,
• said riser assembly and lid constructed of synthetic polymeric material,
• a stationary ring member having internal threads thereon,
• said riser assembly lower section external threads engaging with said ring member internal threads, and
• a plurality of spaced apart tool-engaging receptors on said riser assembly and projecting into said interior passageway, whereby
• upon removal of said lid from said riser assembly side wall top portion and insertion of a tool into said receptors, rotation of the tool rotates said riser assembly lower section to elevate said riser assembly lower and upper sections, during which elevation said upper section inclined side wall is moved away from any material previously engaging said upper section inclined side wall.

A telescopic manhole and storm drain installation including:

• a riser assembly having an upper section adjacent a lower section and defining an interior passageway therein,
• said upper section having a side wall terminating in opposite top and bottom portions,
• said side wall inclined upwardly and outwardly from said bottom portion to said top portion and defining substantially an inverted frustoconical configuration,
• said lower section including a circular wall extending in a vertical plane and provided with external threads thereon,
• said lower section circular wall having an uppermost portion vertically aligned with and engageable with said upper section side wall bottom portion,
• a lid removably attachable to said side wall top portion and spanning said interior passageway,
• a stationary ring member having internal threads thereon,
• said riser assembly lower section external threads engaging with said ring member internal threads, and
• a plurality of spaced apart tool-engaging receptors on said riser assembly and projecting into said interior passageway, said receptors located no higher than substantially the medial height of said riser assembly and each defining a vertically disposed cavity accessible from above, along a vertical axis extending therethrough, whereby
• upon removal of said lid from said riser assembly side wall top portion and insertion of a tool into said receptor cavities, rotation of the tool rotates said riser assembly lower section to elevate said riser assembly lower and upper sections, during which elevation said upper section inclined side wall is moved away from any material previously engaging said upper section inclined side wall.