# US 8,733,025 B2 · Prehung door unit structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,733,025 B2 - Document ID: US8733025B2 - Status: Granted - Kind: B2 - Application number: 13/703,163 - Filed: 2010-06-10 - Published: 2013-04-04 - Granted: 2014-05-27 - Earliest claimed: 2010-06-08 - Assignees: Baumert - Applicants: Bernard Baumert - Inventors: Bernard Baumert - Web page: https://patentgrep.com/patent/US8733025B2 ## CPC - E06B 3/36: with a single vertical axis of rotation at one side of the opening, or swinging through the opening (wings requiring lifting before opening E06B3/52) - E06B 1/02: Base frames, i.e. template frames for openings in walls or the like, provided with means for securing a further rigidly-mounted frame; Special adaptations of frames to be fixed therein {(E06B1/003, E06B1/24 take precedence; fastening door or window frames per se E06B1/56)} - E06B 1/18: composed of several parts with respect to the cross-section of the frame itself - E06B 1/52: Frames specially adapted for doors - E06B 1/58: by filling up the joints, e.g. by cementing - E06B 1/6038: {specially adapted for being embedded in the wall} - E06B 5/16: Fireproof doors or similar closures; Adaptations of fixed constructions therefor - 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 The subject of the present disclosure is a prehung door unit structure intended to close an opening, more particularly of rectangular shape, made in a stonework construction such as a wall, rising substantially vertically and separating or demarcating two spaces within a building and, more particularly, within a high-security building, including a prehung door unit made up of at least one door leaf mounted so that it can pivot and of a fixed frame intended to be fitted into said opening. Such a structure further comprises a fixed-frame pre-frame that can be mounted in the recess of the opening and constitutes a support for attaching the prehung door unit so that the prehung door unit can be fixed removably into the opening using rigid and removable connecting means. ## Claims ### Claim 1 A door unit structure designed to close an opening made in a wall, extending vertically and separating or delimiting two spaces in a building comprising: a prehung door unit made up of at least one door leaf, installed to pivot by at least two hinge plates, each one provided with a fixed part and a movable part, about a vertical axis; a door frame including two vertical stanchions and an upper transverse crosspiece, the prehung door unit being able to engage in a recess made in a thickness of the wall of the opening; and a pre-frame able to be mounted in the recess of the opening, and held and locked in position in the recess by respective anchoring and sealing, the pre-frame including a fixation support for the prehung door unit such that the door unit is fixed in an immovable manner in the opening by a rigid and detachable connection. ### Claim 2 (depends on 1) The door unit structure according to claim 1, wherein the pre-frame includes at least one receiving support piece and the prehung door unit includes at least one assembly piece able to be assembled with the at least one receiving support piece by locking with pressure against each other by the rigid and detachable connection, and wherein a seat is devised in each receiving support piece to allow for receiving the corresponding rigid and detachable connection. ### Claim 3 (depends on 2) The door unit structure according to claim 2, wherein the at least one receiving support piece of the pre-frame includes a profiled insert of overall C-shaped cross section configured to be sealed, with anchoring, in the wall, and wherein an opening of the C-shaped profiled insert is designed flush with an outer surface of the wall and able to receive at least one rigid and dismountable connection designed to achieve a locking by pressure of a corresponding assembly piece of the prehung door unit against the at least one receiving support piece and a corresponding portion of the outer surface of the wall. ### Claim 4 (depends on 3) The door unit structure according to claim 3, wherein the opening of the C-shaped profiled insert is essentially flush with the outer surface of the wall in a zone set back from the recess, in order to situate the vertical axis of pivoting of the door leaf set back from the recess, so as to enable clearing of the opening by a lateral disengagement of the door leaf from the opening when the door leaf is in a position of release opening. ### Claim 5 (depends on 4) The door unit structure according to claim 4, wherein the fixed part of each hinge plate of each door leaf comprises an assembly piece able to be locked by pressure, by a rigid and dismountable connection against a corresponding C-shaped profiled insert and a corresponding portion of the outer surface of the wall, so as to allow a transfer of forces directly into the wall, and the door frame comprises at least one assembly piece able to be locked by pressure by a rigid and dismountable connection against a corresponding receiving support piece of the pre-frame. ### Claim 6 (depends on 4) The door unit structure according to claim 4, wherein the door frame extends from the recess at least as far as a level of each C-shaped profiled insert, the fixed part of each hinge plate being fixed to an extension of the door frame, so as to be situated at the level of or in proximity to a C-shaped profiled insert, and wherein at least one portion of the extension comprises an assembly piece able to be locked by pressure by a rigid and dismountable connection against a C-shaped profiled insert and against the corresponding portion of the outer surface of the wall, and wherein the door frame comprises at least one assembly piece able to be locked by pressure by a rigid and dismountable connection against the corresponding receiving support piece of the pre-frame in the recess. ### Claim 7 (depends on 4) The door unit structure according to claim 4, wherein the position of the release opening is at 90° to a plane of the opening. ### Claim 8 (depends on 2) The door unit structure according to claim 2, wherein each hinge plate of each door leaf is fixed to one of the vertical stanchions of the door frame and the latter comprises at least one assembly piece able to be locked by pressure against the at least one receiving support piece of the pre-frame in the recess of the opening. ### Claim 9 (depends on 1) The door unit structure according to claim 1, wherein the pre-frame has an overall U-shape, comprising two vertical stanchions joined together by an upper horizontal crosspiece, the two vertical stanchions and the upper horizontal crosspiece being made from rigid plate profile members or another elongated flat element of rigid material, bent lengthwise so as to present an overall L-shaped cross section. ### Claim 10 (depends on 1) The door unit structure according to claim 1 wherein the pre-frame is susceptible of being prefixed in the concrete shell by a prefixation and fixed rigidly and definitively in the wall by the anchoring and the sealing onto the prefixed pre-frame. ### Claim 11 (depends on 10) The door unit structure according to claim 10, wherein the anchoring includes at least one of: at least one anchoring leg and at least one rigid bent plate. ### Claim 12 (depends on 1) The door unit structure according to claim 1, wherein the door frame is made from profile members placed end to end, each of them made from an elongated and flat element of rigid material having temperature and fire resistance properties able to be applied, directly or indirectly, against at least one surface of a base of the recess. ### Claim 13 (depends on 12) The door unit structure according to claim 12, wherein the elongated and flat element is a rigid plate. ### Claim 14 (depends on 13) The door unit structure according to claim 13, wherein the elongated and flat element further includes a longitudinal bend. ### Claim 15 (depends on 1) The door unit structure according to claim 1, wherein the opening is at least one of a rectangular or square shape. ### Claim 16 (depends on 1) The door unit structure according to claim 1, wherein the at least one rigid and dismountable connection is selected from the group consisting of a hook head and hammerhead bolt. ### Claim 17 (depends on 1) The door unit structure according to claim 1, wherein the door frame further comprises a sill.