Abstract: An improved directional control mechanism for a riding-type surface working machine. The machine includes a pair of frame sections which are disposed in fore and aft relation. A rotor that carries surface working implements, such as trowel blades, is mounted for rotation on each frame section and an engine is mounted on one of the frame sections and is operably connected to the rotors to drive the rotors in opposite directions. The frame sections are connected together by a mounting arrangement that permits each frame section to be tilted in a fore and aft direction, as well as laterally, with respect to the other frame section. Manually operated levers are connected to each frame section to pivot the frame sections in a fore and aft direction, while a foot pedal is operable to tilt the frame sections laterally. By selective tilting of the frame sections, directional control of the machine can be obtained.

Abstract: A pavement having one or more surface layers overlaying one or move base layers disposed on a subgrade with a rigid base layer interposed therebetween. The base layers are composed of paving material. The surface layers are composed of flexible paving material. The bearing member separates the surface layers from the base layers and has about the same longitudinal and transverse dimensions as the surface layers. The bearing member is composed of a substantially aggregate-free or aggregate free material. The bearing member is sufficiently rigid to at least generally prevent any surface layers from conforming, during the useful life of the base layers, to irregularities of the base layers and to move with the surface layers as a unit in response to movement of the base layers.

Abstract: An inclined roadbed is paved by vehicles which are connected by wires to uphill anchor vehicles. A paving vehicle on the inclined surface has a device for projecting a laser beam to a beam-receiving device on its respective anchor vehicle. The height of the wire connection point on the anchor vehicle is changed in response to signals from the beam-receiving device, so as to equalize the forces exerted on the inclined surface by the left and right sides of the paving vehicle. For paving surfaces such as automobile test tracks which have compound curvatures, a pavement laying apparatus has a curved surface formed by a plurality of interconnected screed plates which are each connected to a respective screw jack. A microcomputer stores data representing the desired shape of the pavement at different points along the travel path of the apparatus.

Abstract: An assembly-type barricade comprising a base stand and an upstanding wall both of which are nearly rectangular parallelpipedal. Protruding means is provided in one of the base stand and the upright wall, and receiving means is provided in the other. By positioning the protruding means in the receiving means, the upright wall is detachably mounted on the base stand.

Abstract: A vehicle barricade comprises a frame to which a barrier plate is pivotally mounted for being moved between a passage and a blocking position. First and second hydraulic motors operably interconnect the plate and the frame. An hydraulic power supply is operably connected with the hydraulic motors and includes an uninterrupted line for assuring constant power supply to the first hydraulic motor for thereby biasing the first hydraulic motor into extension and control valve means for selectively supplying power to the second motor for thereby causing selective pivoting of the plate.

Abstract: The present invention relates to a concrete screeding apparatus, and more particularly to an improved portable and lightweight vibrating concrete screed enabling a workman to use same without the need for rigid forms. The screeding apparatus comprises a generally elongated beam having a horizontal surface and a generally vertical surface. A plurality of vibrators are mounted on the beam. The height of the vertical surface diminishes from the center to the edges so as to increase the amplitude of vibration and, therefore, improve the manoeuverability of the screed. In addition, the corners formed by the trailing edge and the side edges of the horizontal surface are rounded so as to avoid the penetration of the side edges into the freshly poured concrete.

Abstract: A kit of hand-held tools 1, 2, for forming a patterned impression 10 in a cementitious material comprises at least two tools, each having a blade 5 which is pressed into cementitious material using a handle 4. A first tool 1 of the kit for covering larger areas has closed interior patterns 15,16 and open exterior patterns 18, and a second finishing tool 2 of the kit has an open perimeter blade portion 21 or 22.Each of the blades 5 of the tools 1,2 may be coated with a release agent and/or may be formed with a penetrating tip.

Abstract: The device comprises a variable-angle elbow coupling (14) interposed between the ends (12, 13) of two successive sections of a column. The coupling (14) comprises a first rectilinear tubular element (14a) and a second rectilinear tubular element (14b) connected to the element (14a) and mounted to be rotatable relative to the element (14a) about an axis (16). The axis of the tubular element (14) makes a non-zero angle with the axis (18) of the first section of the column. The end portions of the elements (14a, 14b) are radially offset relative to the axis (18) of the column and connected to the first section (12) and the second section (13) respectively by detachable rigid tubular elbow couplings (15a, 15b). The device of the invention is applicable to a drilling column.

Abstract: A transfer bridge for a ramp or a dock. The bridge includes a bridge plate, the back end of which is pivotably mounted via a shaft that is disposed in supports. A locking element prevents the shaft from accidentally lifting out of the supports. At the top, the locking element extends about the shaft, and at the bottom, below the shaft, the locking element is detachably connected to the dock.

Abstract: An expansion joint and form for concrete floors, consisting of a free-standing assembly comprising a vertical asphaltic board, a metallic panel flatly abutting against the asphaltic board, and a number of load transfer dowels or rods slidingly passing horizontally through the board and panels to extend on each slide of the panel and board. The rod partially engages at one end a sleeve and one rod section is covered with grease. After fresh concrete is successively poured on each side of the expansion joint, the concrete will harden unto the board, the panel and the sleeve exclusively of the rod section covered with grease. Hence, the rod will be movable relative to the sleeve and surrounding concrete slab, allowing for relative horizontal displacement of the pair of proximate concrete slabs.

Abstract: A portable vibrating screed includes a driven, vibratory rotatable shaft assembly mounted on an elongated frame equipped with means for screeding concrete. The shaft assembly includes a plurality of bearing assemblies spaced along the length of the shaft. Each bearing assembly includes a pair of separate bearing elements mounted on the shaft and supported in bearing supports secured to the frame. Failure of any single bearing element allows a companion bearing element in the same assembly to absorb all of the load imposed on such assembly to prevent shutdown and without impairing the needed vibration.

Abstract: A hydraulic dock leveler having a pivotable main deck, a lip member pivotably connected to the main deck, and a hydraulic system for pivoting the main deck relative to an adjacent loading dock platform and for power extending and power retracting the lip member between a bridging and stored position. The hydraulic system includes valve means to hydraulically hold the lip member in a fully extended bridging position while the main deck is descending relative to the adjacent loading dock platform. When the main deck reaches its lowest level relative to the loading dock platform, the valve means moves to an open condition and the hydraulic system will simultaneously extend the main cylinder to raise the main deck and retract the lip cylinder to pivot the lip member to a stored position.

Abstract: A lane barrier system comprises a plurality of pivotally interconnected modules adapted to be transferred on a roadway. Each adjacent pair of modules are pivotally connected together by a hinge connection to permit the modules to elongate or contract to assume a composite varied length different from a nominal length. The controlled elongation or contraction of the lane barrier system is particularly advantageous when the barrier is positioned at various radii on a curved roadway. Each hinge connection is preloaded, such as by a torsion spring, to positively return the pivot axes of the hinge connections to their nominal positions and the lane barrier system to its nominal length when they are loaded onto a transfer machine for subsequent placement on a roadway.

Abstract: A vehicle security barrier (10) for selectively prohibiting a vehicle from accessing a preselected area and for otherwise controlling vehicular traffic. The security barrier (10) comprises a base (12) defining a travelway (14) over which a vehicle can be driven. The base (12) comprises a forward end portion defining an entryway (20) whereby a vehicle enters onto the travelway (14) and a rearward end portion defining a travelway exit (22) whereby a vehicle exits the travelway (14). The security barrier (10) further comprises a security gate 918) pivotally mounted on the base (12) for being selectively raised to obstruct the travelway (14) and prohibit a vehicle from exiting the travelway via the travelway exit (22). Reciprocal actuating means are also provided for selectively raising and lowering the gate (18). In the preferred embodiment, the reciprocal actuating means comprises a first and second fluid actuated cylinder (64A and B).

Abstract: A device for manually, repetitively imprinting a surface pattern in fresh concrete, comprising: a plurality of blades secured together to form an imprinting unit, lower edges thereof to form the desired pattern when pressed into the levelled surface of fresh concrete; bar handle means to be secured transversely to upper portions of the blades and to extend laterally beyond the perimeter of the imprinting unit to facilitate manual operation of the device; and levelling means secured to and cooperating with the handle means for adjustably vertically positioning the blades of the device with respect to the surface to be imprinted. This device is practical for multiple, fast, repetitive impressions of patterns, in aligned, regular fashion, for example to form linearly and laterally aligned patterns in the surfaces of sidewalks or driveways.

Abstract: A cement screed tool includes bracket clamps designed to be attached at each end of a long two-man screed, with pivotable handles being attached to each of the clamps. Operators can grip each combined handle and bracket assembly with both hands while standing sideways to the screed, inasmuch as the pivotable handle arrangement includes a pair of spaced-apart hand grips. One of the hand grips is positioned above and the other hand grip is positioned rearwardly of the screed, with selective pivoting of the handles then being permitted by the operators. The specific positioning of the hand grips relative to the screed board facilitates an accurate and efficient control of the screed by an operator.

Abstract: In a machine for cutting off or planing off road surfaces, having a steerable chassis with an independent drive motor, and a planing or cutting tool which is located within the contour base line of the chassis and is fixed in vertically adjustable manner on the chassis, a further planing or cutting tool of smaller dimensions is provided which is located outside the contour lines of the chassis. The further planing or cutting tool sits on a bracket which is arranged laterally in translatory moveable manner on the chassis so that the further planing or cutting tool on the bracket can be positioned in a dead space in front of, behind or above the chassis, which dead space is located within the contour lines of the chassis. The further planing or cutting tool permits the cutting of special profiles at the edge of the roadway but, on account of its capacity to be moved, does not restrict the useability of the cutting machine in traffic.

Abstract: A manual lock for a vertically storing lock leveler. The leveler has a locking bar on the side thereof which rides on a cam surface of the lock. The lock has a spring biased latch member with the cam surface and a locking recess. When the leveler is in the vertical stored position, the latch overtravels to have the lockbar engaged in the recess so that positive locking occurs. The lock is released by a manual foot or hand release.

Abstract: A vehicle barricade comprises a frame having an open top and bottom, side, front and rear portions. A barrier plate is pivotally associated with the frame for being pivoted between a first and a second position. A cylinder and piston assembly pivots the barrier plate between the positions. A first stop extends from and is carried by the barrier plate. A second stop is connected to the frame and is engageable with the first stop for preventing said barrier plate from pivoting beyond said second position. A plurality of tubes extend forwardly from the front portion and prevent the frame from moving in the event the barrier plate is impacted by a vehicle.

Abstract: An anti-terrorist vehicle crash barrier includes side support structures, crushable energy absorbing aluminum honeycomb modules, and an elongated impact-resistant beam extending between, and at its opposite ends through vertical guideways defined by, the side support structures. An actuating mechanism supports the beam at its opposite ends for movement between a lowered barrier-withdrawn position in which a traffic-supporting side of the beam is aligned with a traffic-bearing surface permitting vehicular traffic between the side support structures and over the beam, and a raised barrier-imposed position in which the beam is aligned with horizontal guideways defined in the side support structures above the traffic-bearing surface, providing an obstruction to vehicular traffic between the side support structures. The beam is movable rearwardly in the horizontal guideways with its opposite ends disposed transversely therethrough upon being impacted at its forward side by an incoming vehicle.