# US 5,687,816 A · Underground storage space > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,687,816 A - Document ID: US5687816A - Status: Granted - Kind: A - Application number: 08/535,631 - Filed: 1995-09-28 - Granted: 1997-11-18 - Earliest claimed: 1994-10-14 - Assignees: Mannesmann Rexroth GmbH - Inventors: Peter Wusthof; Erich Wirzberger - Web page: https://patentgrep.com/patent/US5687816A ## CPC - B66F 7/16: by one or more hydraulic or pneumatic jacks - E02D 29/12: Manhole shafts; Other inspection or access chambers; Accessories therefor (for underground tanks B65D90/10; for sewerage E03F5/02 {; climbing irons or ladders E06C9/00}) - E04B 1/34363: {with provisions to raise or lower the whole structure} - B66F: HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD ({invalid lifting devices A61G7/10; } mounting artificial islands on piles or like supports E02B17/00; scaffolding combined with lifting devices E04G1/22; lifting devices for sliding forms E04G11/24; lifting of buildings E04G23/06; shores or struts E04G25/00; lifts or other hoisting devices on ladders E06C7/12; props for mining E21D15/00) - E02D: FOUNDATIONS; EXCAVATIONS; EMBANKMENTS (specially adapted for hydraulic engineering E02B); UNDERGROUND OR UNDERWATER STRUCTURES {(tunnels, tunnelling, mining E21)} - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) ## Abstract In an underground storage space, particularly for endangered goods, access is effected via a left the opening of which, leading into the storage space, can be closed by two covers which are arranged spaced apart from each other. ## Claims ### Claim 1 An underground storage space comprising an entrance with a lift; wherein the lift has an opening comprising a first cover and a second cover below the first cover, the first cover comprising a swingable flap; the opening is closable by said first cover, and said second cover closes the entrance below said first cover; and rolling means supporting said first cover for translating said first cover toward said entrance with rotation of said first cover during a closure of said opening. ### Claim 2 (depends on 1) An underground storage space according to claim 1, wherein said second cover is spaced apart from said first cover. ### Claim 3 (depends on 2) An underground storage space according to claim 2, wherein said second cover is connected to said lift to form a unitary movable unit. ### Claim 4 An underground storage space comprising an entrance with a lift; wherein the lift has an opening comprising a first cover and a second cover below the first cover, the first cover comprising a swingable flap; the opening is closable by said first cover, and said second cover closes the entrance below said first cover; and said underground storage space further comprises a stationary rack and a toothed sector gear which rolls on the rack; wherein said flap is operable by a swinging movement which takes place via a rolling of said sector gear on said rack. ### Claim 5 (depends on 1) An underground storage space according to claim 1, further comprising a hydraulic actuating cylinder for actuating said flap. ### Claim 6 An underground storage space comprising an entrance with a lift; wherein the lift has an opening comprising a first cover and a second cover below the first cover, the first cover comprising a swingable flap; the opening is closable by said first cover, and said second cover closes the entrance below said first cover; and said underground storage space further comprises a hydraulic actuating cylinder for actuating said flap; and swing means for swinging said flap, and a chamber covered by a part of said flap upon a closure of said flap; wherein said actuating cylinder and said swing means are located in said chamber, said flap part extending above said swing means. ### Claim 7 (depends on 6) An underground storage space according to claim 6, further comprising a cylinder rod, operative with said cylinder; wherein said cylinder rod of the actuating cylinder is pivoted to an end of said flap part. ### Claim 8 An underground storage space comprising an entrance with a lift; wherein the lift has an opening comprising a first cover and a second cover below the first cover, the first cover comprising a swingable flap; the opening is closable by said first cover, and said second cover closes the entrance below said first cover; said second cover is spaced apart from said first cover; said second cover is connected to said lift to form a unitary movable unit; said entrance has an enclosing wall having stops; and said second cover lies, in a lowered condition of said lift, on said stops and bears the weight of said lift. ### Claim 9 (depends on 8) An underground storage space according to claim 8, further comprising a surrounding seal arranged between said second cover and said wall. ### Claim 10 (depends on 1) An underground storage space according to claim 1, further comprising an operating cylinder for displacing said lift. ### Claim 11 An underground storage space comprising an entrance with a lift; wherein the lift has an opening comprising a first cover and a second cover below the first cover, the first cover comprising a swingable flap; the opening is closable by said first cover, and said second cover closes the entrance below said first cover; said underground storage space further comprises a plurality of operating cylinders for raising said lift; a masonry wall disposed laterally of said lift, said operating cylinders being arranged in recesses of the masonry wall; wherein said operating cylinders include cylinder bodies and piston rods; said cylinder bodies are movable with the lift and are fastened to the lift; and ends of said piston-rods are fastened, fixed in position, on said masonry wall. ### Claim 12 (depends on 11) An underground storage space according to claim 11, further comprising a hydraulic storage station and a hydraulic unit which feeds to the hydraulic storage station operating fluid necessary for the actuating of said operating cylinders; wherein said hydraulic unit and said storage station are located below said lift on a bottom of the storage space. ### Claim 13 (depends on 11) An underground storage space according to claim 11, further comprising a distance-measurement system; and wherein said operating cylinders are controlled for raising and for lowering said lift via said distance-measurement system in synchronism with movement of said lift upon retraction and extraction movements of said piston rods.