# US 11,078,666 B2 · Formwork system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,666 B2 - Document ID: US11078666B2 - Status: Granted - Kind: B2 - Application number: 16/491,551 - Filed: 2018-03-06 - Published: 2020-12-10 - Granted: 2021-08-03 - Earliest claimed: 2017-03-06 - Assignees: Csr Building Products Limited - Applicants: CSR Building Products Limited - Inventors: Stephen W. Darwell - Web page: https://patentgrep.com/patent/US11078666B2 ## CPC - E04B 2/8629: {with both form leaves and spacers being monolithic} - E04B 2/8647: {with ties going through the forms} - E04B 2/8652: {with ties located in the joints of the forms} - E04B 2002/867: {Corner details} - E04B 2002/8676: {Wall end details} - 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 Disclosed is a form work system (100) that comprises first (102a) and second (102b) building formwork components that are connected by a building formwork connector (104). The connector (104) comprises a moveable portion (128) that is moveable from a closed position to an open position. In the closed position, one or more sidewalls of the connector (104) define a cavity (144) for receipt of cementitious material. The cavity (144) of the connector (104) is located with respect to cavities (110) of the first (102a) and second (102b) formwork components. In the open position, access is provided to the cavity (144) of the connector (104). ## Claims ### Claim 1 A building formwork system comprising: first and second building formwork components, each comprising spaced sidewalls having spaced webs extending therebetween so as to define cavities within the first and second formwork components, the cavities being configured for receipt of a cementitious material, one of the spaced webs being located at a respective end of each of the first and second building formwork components; a connector connecting the first and second formwork components at the respective ends, the connector comprising one or more sidewalls having a detachable portion that is movable from a closed position to an open position; wherein: in the closed position, the one or more sidewalls define a cavity in the connector configured for receipt of the cementitious material, the cavity defined by the connector located at the respective ends of the first and second formwork components, with one of the one or more sidewalls being located to extend across a respective end proximate to a respective said one of the spaced webs; and in the open position, access is provided to the cavity defined by the connector; wherein said detachable portion includes a detachable element configured to provide said access to the cavity defined by the connector in the open position, the detachable element comprising two external sidewalls defining an external corner of the connector, and one or more internal sidewalls that extend therebetween, the internal sidewalls partially defining the cavity defined by the connector. ### Claim 2 (depends on 1) The building formwork system according to claim 1 wherein the first and second building formwork components and the connector together form a corner of a wall structure. ### Claim 3 (depends on 1) The building formwork system according to claim 1 wherein the cavity defined by the connector is defined between the detachable element and the one or more sidewalls extending across the respective ends of the formwork. ### Claim 4 (depends on 1) The building formwork system according to claim 1 wherein the detachable element is detachably connectable to at least one of the first and second formwork components. ### Claim 5 (depends on 1) The building formwork system according to claim 1 wherein an outer surface of the connector is configured to be flush with corresponding outer surfaces of the first and second formwork components when engaged thereto. ### Claim 6 (depends on 1) The building formwork system according to claim 1 wherein one or more of the sidewalls of the connector comprises at least one aperture for receipt of a reinforcement member therethrough, the reinforcement member able to extend from the cavity defined by the sidewalls and into a cavity of an engaged one of the first and second formwork components. ### Claim 7 (depends on 1) The building formwork system according to claim 1 wherein the cavity defined by the one or more sidewalls of the connector is in fluid communication with a cavity of at least one of the first or second building formwork components. ### Claim 8 (depends on 1) The building formwork system according to claim 1, wherein one or both of the internal sidewalls comprises at least one aperture for receipt of a reinforcement member therethrough, with the system further comprising at least one said reinforcement member, the at least one reinforcement member extending through the at least one aperture and into the cavity of a respective one of the first and second formwork components, an end of the reinforcement member disposed in the connector cavity. ### Claim 9 (depends on 8) The building formwork system according to claim 8 wherein the reinforcement member is U-shaped, legs of the reinforcement member extending through apertures in the internal sidewalls and into the cavities of the first and second building formwork components, a central portion of the reinforcement member, connecting the legs, being disposed in the connector cavity. ### Claim 10 (depends on 1) The building formwork system according to claim 1 wherein the external sidewalls and internal sidewall configure the detachable element as a hollow section. ### Claim 11 (depends on 10) The building formwork system according to claim 10 wherein support webs extend within the hollow section, between the internal sidewall and external sidewalls. ### Claim 12 (depends on 1) The building formwork system according to claim 1 wherein the connector further comprises a connecting element, the connecting element comprising engagement portions for engaging each of the first and second formwork components at the respective ends thereof. ### Claim 13 (depends on 12) The building formwork system according to claim 12 wherein the detachable element is at least one of (i) detachably connectable to the connecting element by way of a snap-fit arrangement or (ii) is connectable to the connecting element by way of a sliding arrangement. ### Claim 14 (depends on 12) The building formwork system according to claim 12 wherein the connecting element comprises respective sidewalls of the one or more sidewalls, the respective sidewalls of the connecting element being engageable with the respective ends of the first and second formwork components by way of one or more of: a sliding arrangement or a snap-fit arrangement. ### Claim 15 (depends on 14) The building formwork system according to claim 14 wherein a first of the respective sidewalls of the connecting element extends across the respective end proximate to the respective said one of the spaced webs of the first formwork component when engaged thereto; and wherein a second of the respective sidewalls of the connecting element extends across the respective end proximate to the respective said one of the spaced webs of the second formwork component when engaged thereto. ### Claim 16 (depends on 15) The building formwork system according to claim 15 wherein the first respective sidewall comprises at least one engaging flange extending therefrom to engage corresponding flanges of the first formwork component, and wherein the second respective sidewall comprises at least one engaging flange to engage a corresponding groove of the second formwork component.