# US 2025/0154779 A1 · Interlocking Work Platform and System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0154779 A1 - Document ID: US20250154779A1 - Status: Published application - Kind: A1 - Application number: 19/020,584 - Filed: 2025-01-14 - Published: 2025-05-15 - Earliest claimed: 2021-03-02 - Assignees: Werner Co. - Applicants: Werner Co. - Inventors: Fang Chen; Liang He; Ling Zhu - Web page: https://patentgrep.com/patent/US20250154779A1 ## CPC - E04G 1/30: Ladder scaffolds {(ladders having platforms E06C1/39, platforms on, or for use on; ladders E06C7/16)} - E04G 1/34: Scaffold constructions able to be folded in prismatic or flat parts or able to be turned down - E06C 1/39: Ladders having platforms; Ladders changeable into platforms (platforms for use on ladders E06C7/16) - E06C 1/393: Ladders having platforms foldable with the ladder - E04G 2001/157: {Extensible platforms, e.g. telescopic platforms} - E04G 2001/302: {with ladders supporting the platform} - E04G 2001/305: {The ladders being vertical and perpendicular to the platform} - E04G: SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS - E06C: LADDERS (E04F11/00 takes precedence; step-stools A47C12/00; adaptation of ladders to use on ships B63B, to use on aircraft B64; scaffolding E04G) ## Abstract A work platform system having a first work platform. The first work platform having a first hook assembly and a first latch assembly. The system having a second work platform. The second work platform having a second hook assembly and a second latch assembly. The first work platform locked to the second work platform through the first hook assembly engaging with the second latch assembly and the first hook assembly in the use position. A method for using a work platform system. A method for producing a work platform. ## Claims ### Claim 1 A work platform system comprising: a first work platform comprising: a first scaffold having a first end and a second end and a plane upon which a user can stand; a first leg assembly rotatably attached with bolts to the first end of the first scaffold having a first rail and a second rail and a rung attached to the first rail and the second rail, the first leg assembly in a folded position relative to the first scaffold and essentially in parallel with the plane of the first scaffold; a second leg assembly rotatably attached with bolts to the second end of the first scaffold, the second leg assembly in an open position relative to the first scaffold and essentially perpendicular to the plane of the first scaffold; a first hook assembly slidingly attached to the first scaffold adjacent the first end which slides between a use position where the first hook assembly extends below and outward beyond the first scaffold between the first rail and the second rail of the first leg assembly and a stowed position where the first hook assembly is retracted below the first scaffold; a first latch assembly attached to the first scaffold adjacent the second end; a second work platform comprising: a second scaffold having a first end and a second end and a plane upon which the user can stand which is flat without objects on which the user can trip; a third leg assembly rotatably attached with bolts to the first end of the second scaffold having a first rail and a second rail and a rung attached to the first rail and the second rail of the third leg assembly, the third leg assembly in a closed position relative to the second scaffold and essentially in parallel to the plane of the second scaffold when the second scaffold is attached to the first scaffold; a fourth leg assembly rotatably attached with bolts to the second end of the second scaffold, the second leg assembly of the second scaffold in an open position relative to the second scaffold and essentially perpendicular to the plane of the second scaffold; a second hook assembly slidingly attached to the second scaffold adjacent the second end of the second scaffold which slides between a use position where the second hook assembly extends below and outward beyond the second scaffold between the first rail and the second rail of the fourth leg assembly and a stowed position where the second hook assembly is retracted below the second scaffold; and a second latch assembly attached to the second scaffold adjacent the first end of the second scaffold, the first work platform locked to the second work platform through the first hook assembly engaging with the second latch assembly and the first hook assembly in the use position. ### Claim 2 (depends on 1) The system of claim 1 wherein the second latch assembly has latch assembly hooks. ### Claim 3 (depends on 2) The system of claim 2 wherein the first hook assembly has a hook crossbar which is locked to the latch assembly by the latch assembly hooks in the use position. ### Claim 4 (depends on 3) The system of claim 3 wherein the second latch assembly has recesses in which the hook crossbar is locked into place by the latch assembly hooks in the use position. ### Claim 5 (depends on 4) The system of claim 4 wherein the second latch assembly has springs engaged with the latch assembly hooks which bias the latch assembly hooks into a closed position to lock the hook crossbar into place in the recesses in the use position. ### Claim 6 (depends on 5) The system of claim 5 wherein the first hook assembly has a first hook and a second hook in parallel and spaced relation with the first hook, the hook crossbar attached to and extending between the first hook and the second hook. ### Claim 7 (depends on 6) The system of claim 6 wherein the first hook has a top surface and a first notch disposed in the top surface of the first hook, and the second hook has a top surface and a second notch disposed in the top surface of the second hook. ### Claim 8 (depends on 7) The system of claim 7 including a first projection and a second projection disposed adjacent the first end of the second scaffold and extending downward from the second scaffold, the first projection engaged with the first notch and the second projection engaged with the second notch in the use position. ### Claim 9 (depends on 8) The system of claim 8 wherein the second latch assembly automatically engages the hook crossbar when the first and second projections are positioned in the first and second notches, respectively. ### Claim 10 (depends on 9) The system of claim 9 wherein the second latch assembly includes a first spring of the springs in contact with a first latch assembly hook of the latch assembly hooks, and a second spring of the springs in contact with a second latch assembly hook of the latch assembly hooks. ### Claim 11 (depends on 10) The system of claim 10 wherein the first scaffold has a first track to which the first hook assembly is engaged and slides between a deployed position, where the hook crossbar extends beyond the first scaffold, and a stowed position, where the hook crossbar is retracted under the first scaffold. ### Claim 12 (depends on 11) The system of claim 11 wherein the first scaffold has a second track in parallel and spaced relation with the first track to which the first hook assembly is engaged and slides between the deployed position and the stowed position. ### Claim 13 (depends on 12) The system of claim 12 wherein the second latch assembly has a backing plate which it is attached to an underside of the second scaffold, a first bracket with a first recess of the recesses which extends perpendicularly downward from the backing plate, and a second bracket with a second recess of the recesses which extends perpendicularly downward from the backing plate and in parallel and spaced relation with the first bracket, the hook crossbar disposed in the first and second recesses when the first work platform is locked to the second work platform. ### Claim 14 (depends on 13) The system of claim 13 wherein the second latch assembly includes a first latch assembly hook of the latch assembly hooks, and a second latch assembly hook of the latch assembly hooks, the first latch assembly hook rotationally attached to the first bracket, and the second latch assembly hook rotationally attached to the second bracket such that as the first and second latch assembly hooks move down against the hook crossbar, the hook crossbar cams open the first and second latch assembly hooks and moves into the first and second recesses, as the hook crossbar moves past the first and second latch assembly hooks and into the first and second recesses of the second work platform the first and second latch assembly hooks of the second work platform move back into the closed position under the action of the first and second springs of the second work platform biasing the first and second latch assembly hooks, respectively, of the second work platform into the closed position which locks the hook crossbar of the first work platform into place in the first and second recesses of the second work platform. ### Claim 15 (depends on 14) The system of claim 14 wherein the second latch assembly includes a latch crank rod connected with the first and second latch assembly hooks, and a first latch lever attached to the latch crank rod and to the second scaffold which causes the first and second latch assembly hooks to retract to the open position when the first latch lever is moved, so the hook crossbar of the first work platform is released from the first and second recesses and the second work platform can be separated from the first work platform. ### Claim 16 (depends on 15) The system of claim 15 wherein the first and second tracks are attached to an underside of the first scaffold. ### Claim 17 (depends on 16) The system of claim 16 wherein the first hook assembly has a crossplate attached adjacent to and extending between a rear end of the first and second hooks, and a first block and a second block attached to the crossplate which engage with and slide in the first track and second track, respectively. ### Claim 18 (depends on 14) The system of claim 14 wherein the second latch assembly includes a sliding latch button on a top surface of the second scaffold which is connected by a cable to the second latch assembly on the underside of the second scaffold, the latch button causing the second latch assembly to enter an open position to release the hook bar. ### Claim 19 A method for using a work platform system comprising the steps of: sliding a first hook assembly attached adjacent to a first end of a first scaffold into a use position where the first hook assembly extends below and outward beyond the first scaffold between a first rail and a second rail of a first leg assembly rotatably attached adjacent to the first end of the first scaffold from a stowed position where the first hook assembly is retracted below the first scaffold; placing a second latch assembly attached to a second scaffold adjacent a first end of the second scaffold on the first hook assembly in the use position; and pushing down on the second scaffold so the second latch assembly engages with the first hook assembly and locks the first work platform to the second work platform with the first scaffold coplanar with the second scaffold and forming a surface. ### Claim 20 A method for producing a work platform comprising the steps of: attaching a track to an underside of a scaffold; fitting a hook assembly to the track so the first hook assembly so the hook assembly slides along the track from a stowed position into a deployed position, where the first hook assembly extends below and outward beyond the first scaffold between a first rail and a second rail of a first leg assembly rotatably attached adjacent to the first end of the first scaffold, and when the first hook assembly is in a stowed position, the first hook assembly is retracted below the first scaffold; and attaching a latch assembly to the bottom of the scaffold. ### Claim 21 A work platform comprising: a first scaffold having a first end and a second end and a plane upon which a user can stand; a first leg assembly rotatably attached with bolts to the first end of the first scaffold having a first rail and a second rail and a rung attached to the first rail and the second rail, the first leg assembly in a folded position relative to the first scaffold and essentially in parallel the plane of the first scaffold; a second leg assembly rotatably attached with bolts to the second end of the first scaffold, the second leg assembly in an open position relative to the first scaffold and essentially perpendicular to the plane of the first scaffold; a first hook assembly slidingly attached to the first scaffold adjacent the first end which slides between a use position where the first hook assembly extends below and outward beyond the first scaffold between the first rail and the second rail of the first leg assembly and a stowed position where the first hook assembly is retracted below the first scaffold, the first hook assembly having a hook crossbar, and a first latch assembly having latch assembly recesses and hooks positioned about the recesses attached to the first scaffold adjacent the second end.