# US 5,341,920 A · Load sensitive conveyor training apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,341,920 A - Document ID: US5341920A - Status: Granted - Kind: A - Application number: 08/060,893 - Filed: 1993-05-12 - Granted: 1994-08-30 - Earliest claimed: 1993-05-12 - Assignees: Long-Airdox Company - Inventors: Shirley D. Riffe - Web page: https://patentgrep.com/patent/US5341920A ## CPC - B65G 39/12: mounted on framework - B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D) ## Abstract An improved belt supporting and guiding apparatus enabling belt travel in other than a linear path wherein there is a base frame and a second frame mounted on the base frame; the second frame has center, left and right portions with surfaces which together define a belt support surface delimiting a concavity that is shaped other than as a constant arc of a circle so that rotation of the second frame on mounting rollers is about an instant center whose spatial location changes constantly. ## Claims ### Claim 1 An improved belt supporting and guiding apparatus for use in a conveyor system having a base frame and a continuous belt to move material in a horizontal plane along a non-linear path from a loading site to a discharge site, said supporting apparatus comprising: (a) a second frame mountable for rotation on the base frame and having a center portion and left and right side portions which extend upwardly and outwardly from the center portion, and wherein said second frame center portion and left and right side portions comprise (i) substantially linear main body parts having longitudinal and transverse dimensions; and (ii) a flange that extends outwardly from the main body part of each of the second frame portions in a direction substantially normal to the direct of the transverse dimension thereof; (b) rollers mounted for rotation within the second frame to receive the continuous belt; and (c) means movably connecting the base frame to the second frame at locations on the left and right side portions thereof so that variation in longitudinally directed belt tension will cause the second frame to rotate on the rollers about an instant center whose spatial location changes constantly during rotation of said second frame. ### Claim 2 (depends on 1) An apparatus as defined in claim 1 wherein each of said linear main body parts has two flanges that extend outwardly therefrom, said flanges defining means for operatively joining said second frame to said means movably connecting the base frame to said second frame. ### Claim 3 (depends on 1) An apparatus as defined in claim 1 wherein said means movably connecting said base frame to said second frame includes rotatable elements mounted in rolling engagement with said left and right second frame side portions. ### Claim 4 (depends on 3) An apparatus as defined in claim 3 wherein said rotatable elements have a circular periphery and are of greater diameter than width. ### Claim 5 (depends on 1) An apparatus as defined in claim 1 wherein said second frame includes: (a) pairs of said center portion and said left and right side portions; and (b) means fixedly joining said pairs into a single second frame base unit. ### Claim 6 (depends on 5) An apparatus as defined in claim 5 wherein said rollers in said second frame are mounted between said pairs of said center portion and said left and right portions. ### Claim 7 (depends on 1) An apparatus as defined in claim 1 wherein said means movably connecting the base frame to said second frame includes: (a) tabs attached to and extending outwardly from the base frame; and (b) rotatable elements mounted on said tabs at a location spaced from the base frame, said rotatable elements being in rolling contact with said left and right side portions. ### Claim 8 (depends on 1) An apparatus as defined in claim 1 wherein one of said side portions includes belt retaining means disposed on the end thereof opposite the end adjacent said center portion, wherein said belt retaining means acts to limit the lateral excursion of the belt. ### Claim 9 (depends on 8) An apparatus as defined in claim 8 wherein said belt retaining means is an idler roller having its axis of rotation extending in a direction substantially normal to the longitudinal dimension of the side portion on which it is disposed. ### Claim 10 (depends on 1) An apparatus as defined in claim 1 wherein said left and right side portions extend upwardly and outwardly from said center portion at an angle of 40.degree., with respect thereto. ### Claim 11 (depends on 1, 10) An apparatus as defined in claim 1 or claim 10 wherein said second frame is movably connected to the base frame at locations that permit said second frame to rotate 20.degree. in each direction from the position where said center portion is horizontal with respect to the base frame. ### Claim 12 A conveyor system comprising: (a) a base frame; (b) a continuous belt to move material in a horizontal plane along a non-linear path from a loading site to a discharge site; (c) a second frame mountable for rotation on the base frame and having a center portion and left and right side portions which extend upwardly and outwardly from the center portion and wherein the center portion and left and right side portions comprise (1) substantially linear main body parts having longitudinal and transverse dimensions; and (2) a flange that extends outwardly from the main body part of each of the second frame portions in a direction substantially normal to the direction of the transverse dimension thereof; (d) rollers mounted for rotation within the second frame to receive the continuous belt; and (e) means movably connecting the base frame to the second frame at locations on the left and right portions thereof so that variation in longitudinally directed belt tension will cause the second frame to rotate on the rollers about an instant center whose spatial location changes constantly during rotation of the second frame.