Abstract: The present invention is directed to a weldless pavement module and a method for making a weldless pavement module. Each of the primary load bearing bars is formed with openings for receiving slotted secondary load bearing bars which are passed through the primary load bearing bars in a substantially horizontal position and which are rotated into a vertical position. The size and shape of the openings and the slots permit the combination of primary load bearing bars and secondary load bearing bars to be skewed to form a nonrectangular parallelogram configuration. Simple tack welds are used to temporarily hold the grating in its desired configuration. A concrete component encases at least the top surface of the grating base member and permanently secures the elements of the grating base member together. The use of tack welds eliminates the requirement that the grating base member be bent into a convex shape prior to welding. A simple flat jig is used.

Abstract: A bit basket mounted on a drilling rig for making and breaking drill string connections. A movable "Y"-like shaped cam is swivelly mounted within a body. Drill string components, such as drill bits and hammers, extend into the basket. The cam has an arcuate engaging face with two tip ends. The cam is thrown so as to engage and hold the component stationary. The connection is then made or broken by the requisite rotation of the drill string by the drilling rig.

Abstract: A collapsible road barrier comprises a foundation pit, a frame located in the foundation pit, an expandable barrier element mounted in the frame, at least one energy absorption element extending from a rear wall of the foundation pit to a rear side of the frame, and at least one stretching element connected between the front side of the frame and the front wall of the foundation pit, such that vehicle impact against the barrier element will cause the frame to first move towards the rear wall of the foundation pit, causing the energy absorption element(s) to compress and the stretching element(s) to extend and eventually break, and then pivot upwardly to stop the vehicle.

Abstract: A covering for an opening in road surfaces, squares or the like comprises a frame and a cover. The cover has a conical, downwardly and inwardly inclined contact surface by which the cover is supported on a bearing surface provided on a support flange of the frame. The bearing surface is also conical and inwardly inclined. At the bearing surface are provided spaced, circumferentially distributed wedge-shaped grooves, which cooperate with lugs on the cover. By means of the inwardly and downwardly inclined surfaces of the lugs and grooves, a self-centering of the cover is obtained. The centering is guided by the lugs. Thus, even in the case of high traffic loads, the cover is not moved from its position.

Abstract: A diamond insert for a rotary drag bit consists of an insert stud body that forms a first base end and a second cutter end. The cutter end of the insert is formed in a convex or spherical shape of polycrystalline diamond material. The convex layer of diamond is oriented relative to an axis of the stud body with a negative rake angle from 0.degree. to about 45.degree. inclusive.

Abstract: An assembly for driving a drilling tool in rotation about an axis related to the drilling tool from a drive column, rotating at its lower end about a second axis, with the axes being substantially convergent at the same point and forming therebetween an angle alpha. The assembly comprises in combination a remote controlled deflector adapted for creating a deviation of an angle alpha, a controller for controlling the value of the angle alpha, a guide for rotating a drilling tool and the drive column at its lower end about the axes relatively to the deflector and a controller for controlling the polar position of the deflector relatively to second axis.

Abstract: A long-handled float device for leveling wet concrete includes mechanism attaching a handle to a float which is adapted to allow a user to adjust the relative angle between the float and the handle. The adapter connecting the shaft to the float includes a yoke, a yoke shaft coupler, a sleeve through which a sleeve guide shaft passes, and a link arm which connects the sleeve to the yoke. Rotation of the handle about its own axis causes sleeve guide shaft rotation which causes movement of the sleeve along the guide shaft axis which is transmitted to the yoke via a link arm causing the angular relationship between the float and the handle to change. By such adjustment, the user may tilt the front float edge upward when the assembly is pushed away from the user. Upon reversing direction, the user may tilt the back float edge upward.

Abstract: A technique for providing a continuous underground tunnel between first and second spaced-apart points and for installing new cable, pipe or conduit is disclosed herein. This technique utilizes a boring device including means for boring through soil and a thrust conduit which pushes the boring device through the soil from a first starting point to a second end point as the device bores through the soil, whereby to form a tunnel between the two points. Thereafter, the cable to be installed within the tunnel is attached to the front end of the boring device and the latter is pulled back through the tunnel to its starting point by means of the thrust cable, thereby automatically pulling the new cable in place.

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: During the laying of a marking line with the aid of at least one paint spray gun (2), profile particles (5) are introduced by means of a profile particle dispenser (4) into the marking composition (3) and thereby enveloped all round by the latter. The dimension of the profile particles (5), which are preferably reflective beads, is greater than the layer thickness of the bare painted line, so that profile elevations are formed. Subsequently, reflective beads (8) which also adhere to the profile elevations are scattered onto this profiled painted line (6), which beads thus ensure a good night visibility in wet conditions and when a water film is present, from which they project. The profile particles (5) can either be directly introduced into the jet of paints emerging from the paint spray gun (2) or, subsequent to the application of a painted line, be scattered thereon and then completely covered with marking composition by means of renewed spraying of a thin film of paint.

Abstract: A retrievable well subsurface safety valve having a valve seat and an arculate valve closure member on the bottom of the housing for increasing fluid flow through the bore of the housing. A nose, separate from the housing, is adapted to be connected in the well conduit below the bottom of the housing for protecting the valve closure member. The subsurface safety valve may be rotationally oriented to connect a flow control passageway to a port in the well conduit. A landing nipple includes a port for receiving hydraulic control fluid, a latching recess for latching the valve housing, and a latching recess for latching the nose, and orientation mechanism for rotating the safety valve relative to the port.

Abstract: The present invention relates to a system for spreading and depositing a spanning beam from a vehicle wherein, in the transport position of the spanning beam on the vehicle, the outer extreme element of the spanning beam is pivotally supported and maintained at its free end by a mobile support device of the vehicle occupying a raised position while the inner extreme element of the spanning beam rests on the outer extreme element along same and wherein the spanning beam can be raised by winding of the working cable on a winch of the vehicle into a position where the inner extreme element is pivotally supported at its free end by the support device with concomitant release of the free end of the outer extreme element from the device.

Abstract: A device for feeding a stage in a direction, the device including: first driving system for relatively coarsely feeding the stage, the first driving system having a piston and a cylinder combined in an assembly; locking system for selectively inhibiting relative movement between the piston and the cylinder at least in the aforementioned direction; and second driving system for relatively finely feeding the stage with an aid of the piston and the cylinder.

Abstract: A method for manufacturing such compactors in different sizes that are meant to be used e.g. on dumping sites for crushing refuse and for compacting the refuse layer. The main parts of the compactors are chassis, engine and cylinder-shaped drums. As per the method according to the invention the compactors are essentially assembled of interchangeable components and modules, of which a varying number is used in assembling compactors of different sizes. The invention also relates to manufacturing a compactor of a compactor series by means of the method. According to the invention the compactor series is mainly assembled by selecting interchangeable drum unit components from three different widths and by using 1, 2, 3 or 4 power transmission gear assemblies, according to the size of the compactor, attached to the ends of the drum unit or units.

Abstract: A method of installing preformed pavement marking materials on an asphalt surface involving using infrared heat to raise the temperature of the surface so that the asphalt is sufficiently softened so that preformed pavement marking materials may be pressed into said asphalt surface.

Abstract: Material, such as old unsound concrete material, is removed from a work surface by discharging water against such work surface at a pressure of from about 10,000 to about 25,000 psi from a rotating nozzle. During operation, the nozzle traverses the work surface along a series of linear paths and is incrementally moved in a longitudinal direction so as to pass over the work surface in a sequence of preferably overlapping transverse bands. An apparatus for carrying out the method of the invention comprises a support structure usefully in the form of a vehicle having an extendible arm driven by an extension means for incremental movement of that arm in a longitudinal direction. A rotatable nozzle is mounted on a nozzle support in turn secured to the extendible arm for bidirectional movement of the nozzle along a transverse linear path. Casters are also provided for maintaining the nozzle at a predetermined spacing from the work surface during operation of the apparatus.

Abstract: The invention provides a tail bridge for bridging a tail end of a motor vehicle and the ground with a ramp rail. A foot part for the tail bridge includes a lower section plate to be placed on ground, an upper section plate solidly jointed to the lower section plate to provide an about V-shape with the apex of the V away from the ramp rail, an upper extension plate joined to the other end of the upper section plate and forming therewith an angle of from about 30 to 70 degrees, and a lower extension plate joined to the other end of the lower section plate away from the apex of the V such that the upper and the lower extension plates are disposed about parallel to each other. Holes are provided in the upper and the lower extension plates for attaching a beam of lumber. A first plate structure to be placed on the motor vehicle tail end is joined along a straight line at one edge to a second plate structure making a angle of from 12 to 20 degrees with the first plate structure.

Abstract: A depressible roadway marker has an outer metal housing within which an elastomeric core is held. The core holds a retroreflective lens element above the level of the roadway which depresses into the metal housing when run over by a vehicle tire. The core includes a wiping element to scrub the lens element each time the core is depressed. The core includes structure to absorb the forces encountered during depression to reduce fatigue damage to the core.

Abstract: Operating head assembly, e.g. cutter head of a coal or other mining machine having provision for feeding a supply of water or other fluid to the head during operation has provision for phasing the fluid delivery to limit it to the zone about the head in which the cutting action is taking place dependent on the direction of movement of the head. Delivery jets of the head are fed through individual valve units (22) each having an independently operable hydraulic or other actuator (28), the power input thereto being controlled by apertured timing faces (36, 38) on co-acting parts of the head (11) and body (10), power feed through the timing faces being controlled e.g. in correspondence to the position of change-over valve (44, 46) operating in response to controls which direct movement of the head. In an alternative construction the valve units are actuated mechanically by a camming formation which can be indexed depending on the direction of movement.

Abstract: The drilling tool proposed serves for making perforations and is equipped with an exchangeable feed helix. To prevent the feed helix from being damaged if the drilling tool becomes tilted or if the feed helix is jammed, the feed helix can execute a specific stroke by means of a supporting spring, in such a way that the drill shank can rotate freely relative to the feed helix.