# US 4,280,800 A · Concrete slab surface finishing apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,280,800 A - Document ID: US4280800A - Status: Granted - Kind: A - Application number: 06/074,842 - Filed: 1979-09-13 - Granted: 1981-07-28 - Earliest claimed: 1977-10-28 - Assignees: Dyform Engineering Limited - Inventors: Christopher B. Bunn - Web page: https://patentgrep.com/patent/US4280800A ## CPC - B28B 19/00: Machines or methods for applying the material to surfaces to form a permanent layer thereon (making shaped articles on mandrels B28B1/30; applying liquids or other fluent materials to surfaces in general B05C; glazing or engobing C04B) - B28B 1/084: {the vibrating moulds or cores being moved horizontally for making strands of moulded articles} - B28B: SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER (foundry moulding B22C; working stone or stone-like material B28D; shaping of substances in a plastic state, in general B29C; making layered products not composed wholly of these substances B32B) ## Abstract A support frame to span and to be moved over the surface of a concrete slab on wheels running on rails extending along side edges of the slap, and having a hopper for depositing a layer of finishing material on the slab surface ahead of at least one roller carried by the frame, said finishing material being confined on the surface by side walls depending from the frame and overlapping the side edges of the slab. Power means rotates the roller, and this roller can be adjusted vertically relative to the frame to adjust the thickness of finishing material being rolled onto the slab surface. ## Claims ### Claim 1 Apparatus for finishing the surface of a concrete slab, comprising: a support frame to span and to be moved over the surface of a concrete slab to be finished, confining side walls depending from the frame to overlap side edges of the slab, means swingingly suspending said side walls from the frame out of balance so that the walls tend to swing inwardly relative to the frame and against the side edges of the slab, at least one roller carried by the frame and extending transversely thereof, power means connected to the roller to rotate said roller, and hopper means carried by the frame and positioned to deposit a layer of finishing material on the slab surface ahead of the roller with reference to the direction of movement of the support frame, said roller rolling out the finishing material on the slab surface and said side walls confining the finishing material on said surface. ### Claim 2 (depends on 1) Apparatus as claimed in claim 1 comprising means for adjusting said roller vertically relative to the support frame and said surface of the slab. ### Claim 3 (depends on 1) Apparatus as claimed in claim 1 in which said power means rotates said roller in the direction opposite to the direction of movement of the frame. ### Claim 4 (depends on 1) Apparatus as claimed in claim 1 comprising: a front wall depending from the support frame ahead of and spaced from the roller and extending transversely of the frame, and means for adjusting the front wall vertically relative to said surface of the slab. ### Claim 5 (depends on 1) Apparatus as claimed in claim 1 comprising: a second roller carried by the frame and extending transversely thereof spaced rearwardly from said first-mentioned roller, and means connecting the second roller to said power means to be rotated thereby. ### Claim 6 (depends on 1) Apparatus as claimed in claim 1 including wheels on the support frame to carry the latter, said wheels being positioned to ride on rails extending longitudinally of said slab at the side edges thereof. ### Claim 7 (depends on 6) Apparatus as claimed in claim 6 including a scraper carried by the support frame ahead of each of said wheels to clean dirt off said rails. ### Claim 8 (depends on 7) Apparatus as claimed in claim 7 in which each scraper comprises a vertical blade extending through a socket mounted on the support frame. ### Claim 9 Apparatus for finishing the surface of a concrete slab, comprising: a support frame to span and to be moved over the surface of a concrete slab to be finished, a sub frame carried by and extending across the support frame; means for adjusting the sub frame vertically relative to the support frame, confining side walls depending from the sub frame to overlap and bear against side edges of the slab, means swingably suspending said side walls from the sub frame out of balance so that the walls tend to swing inwardly relative to the frame and against the side edges of the slab, at least one roller carried by the sub frame and extending transversely thereof, power means connected to the roller to rotate said roller, and hopper means carried by the support frame and positioned to deposit a layer of finishing material on the slab surface ahead of the roller with reference to the direction of movement of the support frame, said roller rolling out the finishing material on the slab surface and said side walls confining the finishing material on said surface. ### Claim 10 (depends on 9) Apparatus as claimed in claim 9 in which said power means rotates said roller in the direction opposite the direction of movement of the frame. ### Claim 11 (depends on 9) Apparatus as claimed in claim 9 comprising a front confining wall depending from the sub frame ahead of and spaced from the roller and extending transversely of the sub frame. ### Claim 12 (depends on 9) Apparatus as claimed in claim 9 comprising a second roller carried by the sub frame and extending transversely thereof spaced rearwardly from said first-mentioned roller, and means connecting the second roller to said power means to be rotated thereby. ### Claim 13 (depends on 9) Apparatus as claimed in claim 9 in which both the support frame and the sub frame are rectangular in shape and said adjusting means comprises bolt means at each of four corners of said frames for adjusting said each corner of the sub frame vertically relative to said each corner of the support frame. ### Claim 14 (depends on 9) Apparatus as claimed in claim 9 in which there are a plurality of pairs of opposed confining walls depending from the sub frame to overlap side edges of a plurality of substantially parallel slabs to be finished, said support frame and said sub frame being wide enough to span said plurality of slabs. ### Claim 15 (depends on 9) Apparatus as claimed in claim 9 including wheels on the support frame to carry the latter, said wheels being positioned to ride on rails extending longitudinally of said slab at the side edges thereof. ### Claim 16 (depends on 15) Apparatus as claimed in claim 15 including a scraper carried by the sub frame ahead of each of said wheels to clean dirt off said rails. ### Claim 17 (depends on 16) Apparatus as claimed in claim 16 in which each scraper comprises a vertical blade extending through a socket mounted on the support frame.