초록 ▼

A roadway access device such as manhole cover, a storm drain, or a utility valve box which facilitates road paving and grinding operations. The access device includes a riser assembly having an inverted frustoconical top portion that minimizes frictional engagement between the riser and the paved su

A roadway access device such as manhole cover, a storm drain, or a utility valve box which facilitates road paving and grinding operations. The access device includes a riser assembly having an inverted frustoconical top portion that minimizes frictional engagement between the riser and the paved surface and permits repositioning in an elevated plane with no excavation necessary. There is a tapered upper portion that engages with an internally threaded extension nut with tool-engaging receptors and when the nut extension is rotated, the upper conical portion does not rotate, but displaces vertically. There is a riser member that is externally threaded and fixed in position relative to the rest of the assembly around which the extension nut rotates in order to vertically displace the access device. Additionally, there are separate removable lids constructed of high strength material which can be put in place during paving and grinding operations and easily removed when operations are complete. The riser assembly couples with an extended valve nut adapter which provides a housing for an existing valve nut extension which is capable of responding to an applied vertical load, and climatic changes by axial displacement and will provide protection for the valve nut extension from debris and natural elements.

대표청구항 ▼

[ I claim:] [1.] A telescopic roadway access device comprising:a riser assembly having an extension nut and a funnel member surrounding said extension nut, said funnel member defining an interior passageway therein;said funnel member having an upper funnel section having a side wall terminating in o

[ I claim:] [1.] A telescopic roadway access device comprising:a riser assembly having an extension nut and a funnel member surrounding said extension nut, said funnel member defining an interior passageway therein;said funnel member having an upper funnel section having a side wall terminating in opposing top and bottom surfaces, and an inner and outer surface, and a circular end cap having an inner and outer surface attached to said bottom surface of said upper funnel section with a thrust washer between said bottom surface of said upper funnel section and said circular end cap;said inner surface of said upper funnel comprising an upper rim with a top and bottom edge, said bottom edge terminating in a horizontal ledge;said side wall inclined upwardly and outwardly from said bottom surface to said top surface and defining substantially an inverted frustoconical configuration;said end cap having at least one tongue projecting inwardly perpendicular from said inner surface of said end cap;said top surface of said upper funnel section forming an inwardly angular seat receiving a circular lid thereon;said extension nut having a circular wall of some thickness extending in a vertical plane and having an inner and outer surface and top and bottom end, said bottom end of said outer surface provided with internal threads thereon,said thickness of said circular wall being wider at said top end and defining a plurality of tool-engaging receptor cavities therein,a tubular riser member having a circular wall extending in a vertical plane defining an interior passageway therein with a bottom and top end, an inner and outer surface, and provided with external threads thereon engaging with said extension nut internal threads;said riser member having a plurality of vertical diametrically opposed fins extending outwardly perpendicular from said outer surface of said riser member at said bottom end of said riser member for fixing said riser member in position relative to said riser assembly;said circular wall of said riser member defining diametrically opposed grooves therein which correspond to said tongues of said end cap, said grooves extending vertically from said top end of said riser member to said bottom end of said riser member on said outer surface of said riser member;said circular lid removably attachable to said side wall top surface of said upper funnel section and spanning said interior passageway, said lid having a lid cover and a structural lid member removably attached to said lid cover,said structural lid member having an outer edge and a bottom surface forming a concave shape;a plurality of conical inserts having a side wall and a top and bottom surface,said side wall of said conical inserts inclined upwardly and outwardly from said bottom surface to said top surface of said conical inserts and defining substantially an inverted frustoconical configuration which is concentric with said funnel member, whereby,upon removal of said lid from said side wall top surface of said upper funnel section and insertion of a tool into said receptor cavities of said extension nut, rotation of the tool rotates said extension nut to vertically displace said riser assembly, during which elevation, said rectangular tongues of said end cap slide within said grooves of said riser member.