# US 4,395,861 A · Security grid for lighting shafts and the like > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,395,861 A - Document ID: US4395861A - Status: Granted - Kind: A - Application number: 06/175,589 - Filed: 1980-08-05 - Granted: 1983-08-02 - Earliest claimed: 1979-08-08 - Inventors: Boris Fipke; Franz Oswald - Web page: https://patentgrep.com/patent/US4395861A ## CPC - E04F 17/06: Light shafts, e.g. for cellars - E04F 19/10: Built-in gratings, e.g. foot-scrapers - E05G 1/024: Wall or panel structure - E06B 9/01: Grilles fixed to walls, doors, or windows; Grilles moving with doors or windows; Walls formed as grilles, e.g. claustra {(emergency release of window grilles E05B65/1033; security bars for wings E05C19/003)} - E06B 2009/015: {Mounting details} - E04F: FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS (windows, doors E06B) - E05G: SAFES OR STRONG-ROOMS FOR VALUABLES; BANK PROTECTION DEVICES; SAFETY TRANSACTION PARTITIONS ({devices to prevent theft of bags, trunks or baskets A45C13/18;} alarm arrangements per se G08B) - E06B: FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES (shades or blinds for greenhouses A01G9/22; curtains A47H; lids for car boots or bonnets B62D25/10; skylights E04B7/18; sunshades, awnings E04F10/00) ## Abstract A security grid for an opening is provided which includes at least two support members fixed on opposite side walls of the opening. Each support member is a hollow rectangular solid. A plurality of tube members extend between and are received in the support members with each of the tube members comprising a hollow tube and a core member inserted in the hollow tube. The core has a length which is greater than the distance between opposite inner walls of the support members. Each of the support members includes holes in the side walls thereof for receiving the tube members therein. Screw-plugs are provided for fixing the support members to the side walls of the opening and the support members include stoppers for closing the ends of the hollow rectangular solid. Further, the hollow rectangular solid includes at least one opening in the top thereof and concrete is poured into the interior of the hollow rectangular solid through the hole, and a reinforcing rod may be set in the concrete. In an alternative embodiment, the hole in the support member extends to the bottom of the side of the support member and extends over at least a portion of the bottom thereof. The support member further includes a slide supported in the support member and slidable in the longitudinal direction thereof. The slide includes openings which are in alignment with the hole to permit the insertion of the tube member into the hole. The slide is slidable to misalign the openings with the hole to prevent the removal of the tube member from the hole. ## Claims ### Claim 1 A security grid assembled on site for covering an opening, said grid comprising: (a) at least two support means fixed on opposite side walls of said opening, each said support means being a hollow box girder having a rectangular cross-section; and (b) a plurality of tube means extending between and received in said support means, each said tube means comprising a hollow tube and a freely rotatable core member inserted therein, said core member having a length greater than the distance between opposite inner walls of said support means, wherein the length of said core member is less than or equal to the length of said hollow tube; (c) wherein, each said support means includes first hole means in said inner wall thereof for receiving said tube means therein. ### Claim 2 (depends on 1) A security grid as set forth in claim 1 wherein said support means includes second hole means, said security grid including screw-plug means for fixing said support means to the side walls of said openings, wherein said screw-plug means are positioned within said support means such that access thereto is through said second hole means. ### Claim 3 (depends on 1) A security grid as set forth in claim 1, wherein said tube means includes means for closing the open ends of said hollow tube. ### Claim 4 (depends on 1, 2, 5) A security grid as set forth in any one of claims 1, 2 or 5, wherein said support means includes means for closing the ends of said hollow box girder. ### Claim 5 (depends on 1, 2, 3) A security grid as set forth in any one of claims 1, 2 or 3, wherein said first hole means is round. ### Claim 6 (depends on 1, 2, 3) A security grid as set forth in any one of claims 1, 2 or 3, wherein said hollow box girder includes at least one opening in the top thereof. ### Claim 7 (depends on 6) A security grid as set forth in claim 6 including concrete in the hollow interior of said hollow box girder. ### Claim 8 (depends on 7) A security grid as set forth in claim 7 including a reinforcing rod set in said concrete. ### Claim 9 (depends on 1, 2, 3) A security grid as set forth in any one of claims 1, 2 or 3, wherein said first hole means extends to the bottom of the side of the support means and extends over at least a portion of the bottom thereof, and wherein said support means includes slide means supported in said support means and slidable in the longitudinal direction thereof, said slide means including openings therein for alignment with said first hole means to permit the insertion of said tube means into said first means, said slide means being slidable to misalign the openings therein and said first hole means to prevent removal of said tube means from said hole means. ### Claim 10 (depends on 9) A security grid as set forth in claim 9, wherein said slide means includes end means extending through a wall of said opening, said end means being movable to cause the movement of said slide means. ### Claim 11 (depends on 9) A security grid as set forth in claim 9, wherein said slide means includes flange means for covering said screwplug thereby preventing access thereto. ### Claim 12 (depends on 1) A security grid as set forth in claim 1, wherein said hollow box girder includes a rod means extending substantially the longitudinal distance of said hollow box girder.