Abstract: A traffic delineator is capable of being depressed so that its upstanding light reflective surface is depressed into a plane coincident with, or subterranean with that of the surrounding pavement, when the delineator is located in a highway, or on any other over travelling vehicle surface. The depression of the light reflective surface of the retractable delineator is activated either by horizontal or vertical thrust. Specifically when a combination of both is experienced as in the case of the movement of vehicular traffic over the delineator or of grading instruments or equipment such as snow ploughs and the like which are used for cleaning the surface of the travelled highway during winter conditions. After the travelling vehicle has passed, the light reflecting surface, as a result of biasing action within the delineator, relocates the light reflective surface again into an elevation above the surface of the road.

Abstract: The unit comprises a power-driven horizontal rotor including a shaft carrying radially mounted tool sets comprising hammers swivel-mounted at at least an intermediate point of the major dimension thereof. Upstream of the shaft there is a serrated blade subjected to oscillatory movements in a normal direction to the plane of lay thereof, the rotor and blade being carried on a frame the rearward end whereof is mounted on two wheels interconnected by an axle adapted to be raised from and lowered onto the frame.

Abstract: An aqueous emulsion of a blend of asphalt having viscosity at 165.degree. F. of about 100 to about 1000 centipoises with a petroleum extender oil preferably having a viscosity at 40.degree. C. of not more than about 1000 centistokes, preferably stabilized with a protective colloid in conjunction with conventional surfactants, provides a particularly effective and long-lasting treatment of substrates, such as dirt or gravel roads and the like, for suppressing the evolution of fugitive dust therefrom by applying the emulsion, usually in dilute form, to the exposed surface of the substrate, as by spraying.

Abstract: An attachment for dump trucks having a dump bed with a chute leading downwardly to a discharge end for discharging material along a roadway surface. The attachment adapts the truck to perform roadway surface repairs by receiving, grading, and pressing roadway repair material into place along damaged areas of the roadway surface while the truck is driven forwardly. The attachment includes a blade that is pivoted to the truck at a position rearwardly adjacent the chute discharge end. The blade is arched to receive and grade loose bulk repair material delivered from the dump truck bin through the downwardly projecting chute. The blade is also pivoted between an operative position, riding along the roadway surface, and an inoperative position above the roadway surface. Material delivered to the blade and graded thereby can be compacted and pressed into damaged roadway areas by the supporting truck tires.

Abstract: A leveler assembly is provided for use within a pit formed in the platform surface of a loading dock. The pit is of conventional construction and includes a recessed horizontal base surface, upright side and rear walls and an open front. The assembly includes a stationary frame mounted within the pit and having an upright section disposed adjacent the pit rear wall and a forwardly extending section mounted on the pit base surface; the latter section effects segregation of the base surface into large contiguous areas, on which debris accumulates, each area being defined in part by the pit open front. A deck member is provided having a rear edge portion thereof hingedly connected to the upright frame section. The deck member, when not in use, normally assumes a neutral position whereby the exposed surface thereof is coplanar with the dock platform surface so as to allow cross-traffic to safely pass thereover.

Abstract: An expansion joint and seal structure for the variable width space between roadway, bridge or like sections subject to expansion and contraction is provided in the form of an elongate elastomer member having spaced transverse passages of generally rectangular cross section with rounded corners in which metal bars of like cross section but shorter length are inserted, both the passages and bars have cooperating indexing devices which center the bars in each passage spaced equidistant from the ends thereof so as to maintain them over the space between the roadway, bridge or like sections.

Abstract: The invention provides a stabilized earth bridge abutment comprising a compacted earth mass containing reinforcing members therein to stabilize the mass, there being provided, in contact with said mass and close to a substantially vertical surface thereof, support means which bear the vertical load of the deck of the bridge while substantially all horizontal forces are absorbed by the stabilized earth mass.In the method of constructing the stabilized earth bridge abutment an earth mass is built up from successive layers of earth and reinforcing elements and facing elements are attached to the ends of the reinforcing elements to provide a substantially vertical face, vertical spaces being provided close to said vertical face for subsequent introduction of support means to carry the deck of the bridge, and after the earth mass has been built and deformation of the earth mass due to its own weight has taken place, support means are introduced into said spaces.

Abstract: A self-raising post of a plastic material, such as PVC, for use as a roadside marking post, a traffic sign post, a lamp post, or for other comparable uses in road traffic environments, has a channel-shaped bending zone with substantially arcuate cross-section and with the convex side facing the on-coming traffic. The cross-sectional area of the bending zone increases progressively towards the lower end, whereby the flaring-out zone formed upon bending of the post will be larger below than above the line of bending. The greater inherent resiliency of the material below than above the line of bending will cause the post to bend back into an upright position after having been hit by a vehicle. Certain embodiments of the posts are manufactured by diagonally splitting lengths of extrusion-molded plastic tubing, forming two identically shaped posts from each tube length.

Abstract: An aircraft loading ramp is disclosed which is capable of movement in three dimensions to accommodate small and large aircraft in varying positions. A tunneled walkway is supported by a pedestal adjacent to the terminal building and a telescoping support column at the free end of the walkway. A cab is rigidly affixed to the telescoping support column for mating with the aircraft. The tunnel is pivotally connected to the cab by a pair of pivotally mounted elongated rocker arms formed at their lower ends with a cam follower which slides along a guide rail affixed to the interior of the telescoping support column to maintain the telescoping support column and the cab upright and to provide a self-leveling mechanism such that the floor of the cab remains level as the telescoping support column is elevated. The tunnel is longitudinally extensible and is adjustable horizontally as the tunnel pivots around the pedestal.

Abstract: A seal construction for a dock leveler having a platform with opposite sides which moves vertically relative to the sides of a pit, including a pair of curtain members each having first and second opposite edges, with the first edges removably attached to the sides of the platform and the second edges removably attached to the sides of the pit, the curtain members sealing the clearance openings between the sides of the platform and the sides of the pit and also sealing the opening which would otherwise be produced between the sides of the pit and the platform when the latter is in an elevated position.

Abstract: The sealing assembly includes a relatively soft rubber, tubular sleeve having an axial length sufficient to span the joint between hollow members, such as the corbel joint between a manhole frame and a manhole casing, and a sealing portion in each of the opposite ends. The outer surface of each sealing portion is compressed radially outwardly in sealing engagement with the interior walls of the manhole frame and the manhole casing by a generally circular hoop which fits into a groove provided in the inside surface of the sleeve. Each hoop has circumferentially movable, end portions and a radially inwardly extending bracket mounted on each end portion at circumferentially spaced locations. These brackets are adjustably pulled toward each other, to increase the circumference of the hoop, by tightening a nut threaded onto the outer end of a bolt connecting the brackets together.

Abstract: A snow plowable pavement marker having a low-profile, including a base member comprising a generally flat circular element having an annular peripheral depending rim adapted to be installed in an annular drilled recess in a highway pavement, the flat lower surface being disposed, in use, directly upon the road surface and the upper surface of the base member providing cavities supporting reflective devices, and the top surface of the base member defining an inclined ramp surface from at least two directions of approach when installed in place in a pavement.

Abstract: A roadway surface patching vehicle is described wherein virtually all roadway patching procedures may be performed by a single operator within a control station of the vehicle unit. The vehicle includes a number roadway repair tools mounted to a moveable carriage on the vehicle frame. This carriage is situated intermediate the control station and the front vehicle wheels. Among the operative tools are a cutter head and a vacuum head adjacent to the cutter head for receiving and directing loose particulate roadway surface material to a storage hopper for subsequent reblending and reuse. The vacuum head may also be used to clean the area adjacent the repair following placement and finished tamping and rolling of the new repair materials. A tamping head is also mounted to the carriage for movement therewith and a roller is mounted to the frame for finishing the repair to grade.

Abstract: A road block for preventing unauthorized vehicles from entering a secured area comprises a pit, a span covering the pit, collapsible support members supporting the span at the trailing end of the plate with respect to the direction of vehicle access, devices for collapsing the support members, and a triggering mechanism for actuating the collapsing devices in response to the approach of an unauthorized vehicle.

Abstract: A material spreader for spreading a topping material over a wet concrete surface utilizes a pair of hoppers which are driven back and forth on a bridge support spanning the surface. A gasoline engine mounts above the hoppers and furnishes power for a reversibly controllable hydraulic hopper drive motor. The motor is part of a hydraulic system in which the hydraulic fluid is cooled by using both a hopper wall as well as the flowing material being spread as heat sinks.

Abstract: A slotted grate (3) is disclosed which is formed of a sheet metal strip with slot (15) therein. Reinforcement of the grate (3) is achieved by inserting a sheet metal arch support (30) between two adjacent slots (15). The arch support (30) is formed of a piece of sheet metal bent into a U-shape with shoulders (35, 36) of its end sections (31) being spaced further apart than the shoulders (37, 38) of its midsection (32). A process is disclosed wherein the slotted grate (3) is constructed by first placing arch supports (30) between the desired slots (15) and then double bending the edge sections of the sheet material forming the grate (3) to form two U-shaped side channels with the shoulders (35, 36) of arch support (30) locked securely therein.

Abstract: The method of making cast barrier structures consisting of the steps of, securing a plurality of form plates in a longitudinally spaced array over a supporting surface with the major plane of each form plate oriented substantially vertically and transversely to the length of the array, positioning side panels longitudinally alongside the form plates on opposite sides thereof and extending the length of the array, the side panels having upper and lower longitudinally extending edges with the lower edges seated on the underlying supporting surface and having irregularities on the inside surface which faces the form plates, fixedly securing the side panels to the form plates to form with the form plates and underlying surface an open-topped hollow assembly, and pouring a solidifiable plastic material downward through the open top of the hollow assembly to completely fill the interior thereof and integrally bond together the form plates and the side panels and the plastic material when the latter solidifies.

Abstract: A ramp bridging device having a bridge plate, the rear end of which is pivotably mounted to a ramp about a horizontal transverse shaft, and an extension for rest and support on a platform which is to be loaded or unloaded. The extension is located at the free end of the bridge plate, is movable in the longitudinal direction of the bridge, and can be extended and retracted. Below a continuous cover plate, the bridge plate is provided with longitudinal members which are parallel to one another. The edges of the bridge plate are preferably provided with vertical side plates. Furthermore, the extension is provided with a portion which extends approximately over the width of the bridge and is adapted to rest on the platform. The extension is also provided with longitudinal members which extend parallel to one another.

Abstract: In order to ensure that a manhole/inspection cover or grating is firmly seated in a road or other surface within which it is installed and is substantially non-rocking, it is supported on opposite sides by two frame members each of which comprises two seating blocks joined together by an elongate bar. The seating blocks have angled seating faces which are inclined downwardly towards each other and which are engaged by correspondingly inclined angled faces on the cover or grating. Furthermore the bar is provided with an additional angled seating face which is inclined in a direction transverse to the longitudinal axis of the bar and is engaged by one or more correspondingly inclined angled faces on the cover or grating. Optionally the or each frame member is double-sided, that is it incorporates a respective additional angled seating face on each side of the bar, so as to support two covers or gratings in side-by side relationship.

Abstract: The process and composition for improving asphalt paving by mining existing roads for their asphalt content, blending the mined or recycled asphalt with new asphalt which is unusually high in resin content to provide a pavement of increased ductility and improved penetration characteristics which will wear better.