Patent GB-190203975-A (GB)
Title: Machine for Packing the Ground, and for Mixing Sand, Water, and Cement to Form Concrete, and Discharging, Laveling, and Tamping the same on the Packed Ground, to Form a Bed for Street and Sidewalk Construction.
Inventor: DEMPSEY JAMES THOMAS
Filed: 1902-02-17
Granted: 1902-05-08
Abstract: 3975. Dempsey, J. T. Feb. 17. Roads and ways, making; road rollers; paving- materials, laying down and spreading. -In a machine for mixing, laying, and tamping concrete, to form a bed for street and sidewalk paving, a roller 3, attached by an arch 2 to a platform 1, is provided, to pack and solidify the earth before the bed of concrete is laid on it. The tamper consists of a cross-bar 25 carried by two cylinders 24 containing springs 26 acting on the heads of plungers carried by extensible links 22 pivoted to crank arms 21 carried by shafts 14. Just in front of the tamper is. arranged a leveller 30 suspended from the platform 1 by extensible links 31, and braced and angularly adjusted by extensible braces 32 having bent arms engaging slotted brackets 34, and having shoulders and clamping-nuts. Cement, sand, and water are mixed in two cylinders 43, each having a hopper 44 with a slide door 45 mounted on a plate 46 connected by cables 47, 48, passing over guide-pulleys to a winding-drum 50. A discharge spout 54 has a similar slide door 55 operated by a drum 58. Each cylinder has an annular jet passage 63 for spraying water upon the sand and cement, a shaft 69 carrying a pair of paddle-wheel stirrers 70, 71, and a shaft 80 carrying a mixing-wheel 81. These shafts are geared, as shown, to the shaft 14, so as to rotate in opposite directions, the shaft 14 being connected at will to a bevel-wheel 13, geared as shewn to one of the vehicle wheels, by a clutch 17 operated by a lever 18 carrying a detent 19 engaging a rack 20. The spout 54 discharges the mixture into a hopper 89 having a sliding bottom 90, operated by a drum 92, and supplying a cylinder 94 having a dischargeopening 95 with a discharge-spout 96. Water is admitted to the hopper 89 by a flexible nozzle 68. To allow the concrete to be discharged in streams of varying thickness, the end of each spout 96 is partly in the form of hinged plates having projecting bolts engaging slots in side sliding plates, outward movement of the hinged plates, when adjusted, being prevented by guard brackets 102. A flexible valve 103, controlling the opening 95, is operated by a drum 106. A shaft 110, extending through the cylinder, carries gear-wheels 112, and has a square part, on which is mounted a sleeve having agitator arms 114. Agitating-wheels, connected by cross-bars 116, have end sleeves carrying gear-wheels 117. The wheels 112, 117 are geared, as shown, to the driving gear-wheel 7, so as to rotate in opposite directions. Sand and cement are supplied to the hoppers 44, and broken rock to the hopper 89 by buckets 125 having bails or handles 126, and running on rollers 40, 41 of the form shown, and mounted in bearings 42 on the supports 1, 38. Each hopper has a bracket 138 to enable it to turn about a stop 139 to discharge its contents, and side springs to engage ratchet-teeth on guard rails 135 to prevent the charged buckets from falling off the vehicle. The buckets are hoisted on to the machine by a band windlass 133, or a power hoist having a cable 131 passing over pulleys 129, 130 on a swivelling beam 128, and connected at 132 to the beam.