Showing papers on "Screed published in 1969"

Screed holding device

Abstract: A device for supporting a screed at the proper elevation in a concrete form. The device has a convenient base which is attached to the lower surface of the form, and an upright support that is releasably engaged in the base. The upright member has a bracket adjustably and releasably supported therealong to receive the screed member therein.

Improvements in or relating to Building Structures.

Abstract: 1,157,545. Connections between floor panels and skeleton framework. BROCKHOUSE STEEL STRUCTURES Ltd. 6 May, 1968 [5 May, 1967], No. 20965/67. Heading E1A. A floor panel 13 is connected to the skeleton framework 11 of a building by a coupling 21 having resilient means 22 which prevents relative horizontal movement of the components 11, 13 but permits relative vertical displacement therebetween. The member 22 may comprise a coiled spring, a leaf spring or a block of rubber. The floor panel may consist of recessed concrete from members 14, 14a carrying a wood wool panel 17 having a screed 18 thereon. For minor modifications involving materials &c., the Specification should be referred to.

Method of erecting a grain bin

Abstract: A method of erecting a grain bin is disclosed herein which substantially reduces the time and effort involved in erecting grain bins. The method comprises the steps of (1) forming a trench in the desired configuration of the foundation; (2) attaching wallsheets to a series of reticulated reinforcing and screed members; (3) positioning the members with the wallsheets attached thereto horizontally and upstandingly in the trench; and (4) pouring concrete in the trench to form the foundation. The reticulated reinforcing and screed members are of inverted Lshaped configuration and unitary construction.

Photocell grade sensor and buoyancy slope sensor

Abstract: In a paving machine having a tractor and a screed means extending transversely across the rear end and connected to the tractor pulling arms on each side thereof, a control system automatically maintains the grade and slope of the screed as the tractor moves over an irregular surface. A photoelectric sensing means measures vertical deviation from a reference plane, produces a signal that is amplified to actuate an electrically operated valve means actuating a power means that controls the grade of one side of the screed. A second photoelectric sensing means measures the vertical movement of the opposite side relative to the first side, and produces a signal that is amplified to control a second electrically operated valve means that controls a second power means and said opposite side of the screed, thereby maintaining the screed at a constant slope.

Quick crown change for screeds and the like

Abstract: Crown control for screeds and the like in which a continuous screed bar is suspended from a beam in the form of two aligned beam sections spaced apart at their adjacent ends. The beam sections are pivoted to the screed bar at their outer ends by brackets depending from the outer ends of the beam sections, and pivotally connected to the outer ends of the screed bar for movement about axes extending transversely of the bar. Spaced links are pivotally connected between each beam section and the screed bar and extend angularly downwardly and outwardly from the respective beam sections. A guiding connection is provided between the beam sections, and guides the beam sections for angular movement about their axes of connection to opposite ends of the screed bar. A power jack is spaced above the beam and extends across the adjacent ends of the beam sections, and is connected thereto at its opposite ends. As the jack is extended, the beam sections will pivot upwardly about their axes of connection to the screed bar. This will draw the screed bar upwardly from its opposite ends through the connecting links and will draw the screed bar into a parabolic crown. Retractable movement of the power jack will align the beam sections and move the screed bar into a flat position.

Apparatus for positioning a finishing screed member in a road paving machine

Abstract: In a road-paving machine, surfacing material is deposited on a subbase and a finishing screed board spreads and finishes or levels the surface of the material to the proper grade and plane. Test feelers are mounted on the screed board to detect any deflections from a reference position, though the machine causes vibration, the test feelers are arranged to measure the actual deflection and to signal the extent of the deflection to a regulating instrument for correcting the position of the screed board in accordance with the deflections measured.

Manufacture of Hollow Concrete Planks

Abstract: 1,174,711. Moulding hollow concrete planks. WEST ALLIS CONCRETE PRODUCTS CO. 14 March, 1968, No. 12382/68. Heading B5A. [Also in Division E1 In a method of moulding a hollow concrete plank, comprising a plurality of cavities, wherein the concrete is cast on to a bed from a machine travelling thereover and provided with cavity defining cores, bridging of the concrete in the webs between the cavities is prevented by progressively tamping the concrete over the cores with a series of elements, comprising a plurality of downwardly projecting lugs of progressively decreasing depth and the side tamping surfaces whereof one of decreasing inclination to the horizontal transversely of the cores, which tamp the concrete whereby it is progressively displaced over and forced into the webs to form a flat surface. The plank is cast on to bed 20 from a travelling machine 21, including hoppers 22, 24, 28 for depositing successive layers of concrete, and preliminary tampers 36 and 37 comprising grooved surfaces for forming in the first layer of concrete, ridges (38), Fig. 6 (not shown), over pretensioned reinforcing wires (35), and valleys (39) therebetween for receiving the cores 31 which longitudinally reciprocate on the machine 21 and are provided with tapered ends 31 for ploughing through an intermediate concrete layer deposited thereover from the hopper 24 which is provided with a tamper 40 which also controls the hopper discharge. Tampers 43, 44 and a screed 63 tamp concrete over the cores 31 and into the webs intermediate thereof, and reciprocating trowels 68 and 67 smooth the upper concrete layer. The tamper 43 comprises a first series of lugs 45 provided with bottom surfaces 46 for tamping over the cores 31, side surfaces 47 inclined at 60 degrees to the horizontal and surfaces 48 intermediate the lugs 45 for tamping the concrete intermediate the cores 31, and a second series of lugs 49 provided with bottom surfaces 50, which project lower than surfaces 47, side surfaces 51 inclined at a shallower angle of 45 degrees than surfaces 47, and which lugs 49 are either integral with the tamper or mounted on a spacer 52 whereby the surfaces 53 are lower than surfaces 48, the overall effect being to define a shallower and narrower groove between lugs 49 than between lugs 47. Tamper 44 is similarly provided with two series of lugs defining progressively shallower and narrower grooves. The tamping screed 63 is supported for vibrating or tamping motion and may be flat or preferably is provided with downwardly projecting lugs (65), Figs. 4 and 5, not-shown, which progressively taper to a flat surface towards the screed trailing edge.