Abstract: A method for levelling and smoothing concrete when concreting large areas. According to the method a machine which is so constructed that it floats lightly even on highly fluid concrete mass and thus normally exerts a very low surface pressure against the substratum, is caused to move over the surface of the concrete while smoothing and levelling the same as a result of rolling motion between the surface and a belt of the machine in contact therewith. The smoothing or levelling effect of the belt can be amplified by vibrating a plate supporting the belt. The concrete may also be subjected to vacuum treatment at the same time as levelling or smoothing the concrete. The invention also relates to a machine for carrying out the method.

Abstract: An asphalt pavement heating device, for use with an asphalt pavement recycling or repair apparatus which uses heaters to warm the asphalt to a pliable form thereby facilitating the recycling or repair process, wherein a pressurized combustible gaseous mixture of fuel and air is burned in a non-oxidizing blue hot flame which is impinging the pavement surface, said flame being formed in a firebox which is suspended on the front and/or underneath the carriage of the apparatus over the heated surface, said firebox having flexible or "sealing curtain type" side walls which drape to the surface thereby excluding the entrance of ambient air, said device being characterized by its capabilities to rapidly heat asphalt concrete pavement and its smokeless exhaust.

Abstract: A multi-function valve assembly for controlling fluid flow through a single cavity, the valve assembly being particularly suited for use with an inflatable packer in a well bore. The valve assembly includes a control valve sliding piston in one end of a cavity such as a cavity in an inflatable packer, the cavity communicating between the interior of a tubular (such as well casing) and an annulus between the tubular and a wellbore in which the tubular is positioned. The control valve sliding piston isolates the packer until a certain predetermined pressure is reached, at which point it moves in response to the pressure of the fluid in the casing, thereby permitting flow of fluid from the casing into an inflatable bladder in the packer. An over-pressure piston disposed in the same cavity senses the packer inflation pressure and moves the control valve piston to close the valve, halting further inflation.

Abstract: An improved concave extension for use with an arcuate concave cooperable with a threshing and separating rotor in an axial flow combine is disclosed wherein the sub-frame assembly of the concave extension is provided with a mounting clevis rotatably engageable with one of two mounting pins extending from the concave frame members to permit the concave extension to be rotated relative to the concave frame members. The subframe assembly is also provided with a hole therein alignable with a plurality of openings in the respective concave frame members to permit the use of a fastener extending through the hole in one of the aligned openings to fix the position of the concave extension relative to the concave frame members, thereby providing variable configurations of the rub bars on the concave extension relative to the rub bars of the concave. A filler plate is rotatably mounted to the forwardmost concave frame member and positionable relative to both the concave frame member and the concave extension.

Abstract: A crank damper pulley structure of an internal combustion engine of a car in which the hub of a pulley, which is removably fixed to the tip of the engine crank shaft and transmits power to auxiliary machinery, such as an alternator, has therearound a damper mass and a damper rubber comprising a torsional damper. The hub has a cavity therein which opens to one end of the hub. A damper support is fixed in the cavity and a ring-like damper and a ring-like damper mass are superposed axially with the rubber being fixed to the mass and the support in order to constitute a ring-like dynamic damper disposed in the cavity which copes with bending vibration of the crank shaft.

Abstract: A riding-type surface working machine includes a pair of rotors each of which carries a plurality of trowels or surface working members. Each rotor includes a transmission unit and power from the engine is transmitted through each transmission unit to rotate the individual rotors. To provide directional movement for the machine, the upper end of each rotor includes a shaft that is connected to the respective transmission unit. The shaft is mounted for universal tilting movement with respect to the frame of the machine. An eccentric is mounted on each rotor shaft and is rotatable in a fixed sleeve. Each eccentric is connected through a chain drive to a vertical control stick and the control sticks for the respective rotors are mounted concentrically on the machine. Through manual operation of the control sticks the eccentrics can be individually rotated to thereby tilt the rotors to cause directional movement of the machine.

Abstract: A method and apparatus for cementing an oil or gas well casing including a tubular body section for placing in an oil or gas well casing, the tubular body section being connectable at its upper end to a string of drill pipe and at its lower end to a perforating gun, the tubular body section having a hollow interior, a plurality of upper ports, and a plurality of lower ports, a sliding sleeve located inside the tubular body section adapted to permit drilling fluids to be pumped therethrough and out of the lower ports and to slide downwardly in response to pressure applied to the interior of the string of drill pipe when a seal is placed in contact with the sliding sleeve and thereby activate the perforating gun to perforate the casing, close the lower ports, and open the upper ports to permit cement or other fluids to be pumped outwardly through the upper ports.

Abstract: This invention concerns a process for making a roadway marking strip adhere to a roadway surface without the need for any preliminary preparation, using a flame that simultaneously contacts the self-adhesive primer coating of the roadway strip and the roadway surface itself. This invention also concerns a process for covering the adhesive primer layer on the roadway strip with a thin sealing layer, and thus-formed roadway strip.

Abstract: An asphalt pavement structural section includes a plurality of material layers arranged to act as an integral mechanical beam. The layers are arranged into a preselected sequence from subgrade to an upper surface course with the layer having the greatest tensile strength positioned adjacent the subgrade.

Abstract: Lag-determining method and apparatus which provides for determination of and an indication of when borehole cuttings from preselected depths arrive at the surface of the earth is disclosed and includes devices for inputting the value of the lag strokes and the predetermined drilling depth increments. A signal representative of the actual drilling depth is provided to a computer circuitry. Counter circuitry accumulates a count of the strokes of the positive displacement mud pump. Adder circuitry sums the lag strokes and the accumulated count of the mud pump. Comparator circuitry provides an output when the compared values of the accumulated number of strokes of the positive displacement mud pump equals the sum of the lag strokes and the strokes of the positive displacement mud pump at a predetermined depth plus the depth increment. Visual and audio indications provide notification of the arrival of borehole cuttings from preselected depths.

Abstract: A reversible air-operated percussive action machine for driving holes in the ground has a housing accommodating a hammer 2 capable of reciprocating therein. An air distributor 3 is arranged in the hammer 2 in the form of a fixed tube 12 and a valving member 13 movable relative to the tube. Defined between the tube 12 and valviong member 13 is an accumulating chamber 18 which communicates with an air feeding line 4. An air restrictor is further provided for discharging air from the accumulating chamber 18 when the supply of compressed air to the air feeding line is terminated. The valving member 13 spring-loaded relative to the tube 12 by a spring arranged so that during feeding compressed air to the accumulating chamber 18 the valving member 13 is acted upon by a pressure force directed counter to the action of the spring.

Abstract: A fluid pressure activated firing head for a perforating gun disposed in a subterranean well by a packer is provided with a column of clean fluid overlying and filling the bore of the firing head but communicating with the casing annulus above the set packer. An annular fluid passage extends from the top of the clean fluid column through the set packer and ending in an inverted U-shaped annular passage. A pressure transmitting seal is mounted in the downwardly extending leg of the annular fluid passage to permit the entire fluid passage to be filled with clean fluid of a lighter density than the casing annulus fluids, thus insuring that casing annulus fluid can never enter the interior of the pressure activated firing head.

Abstract: A device for sealing the joint between adjacent structural members such as concrete slabs in bridges, parking decks, and the like, and for absorbing thermal expansion and contraction of the adjacent structural members. The compression seal employs a cross-sectional configuration comprising a square center cell within a square outer seal structure to provide an advantageous movement rating while minimizing vertical elongation of the seal during compression. As lateral compressive forces are exerted on the vertical sides of the outer square by thermal expansion of the adjacent structural members, the seal collapses in a controlled manner, the square center cell redirecting lateral compressive forces to support the upper and lower seal walls. Thus, the upper wall of the seal provides a substantially planar pedestrian treadway even as the seal is compressed.

Abstract: A joint covering has an elastic mat that is cast in situ and lies on rigid plates bridge the gap. The plates are controlled by providing the mat with elastomeric projections on its underside which engage the plates. The elastic behavior of the mat is not impaired in any way as a result.

Abstract: Disclosed is a two piece drill chuck for use with downhole drills and the like. The new chuck features a replaceable wear collar portion which permits optimum material selection and heat treatment for each part of the chuck thereby extending its useful life. By expanding the wear collar slightly beyond the drill diameter and extending it axially rearward an improved measure of protection is also afforded to the drill casing.

Abstract: A slab-type short span bridge constructed of at least one corrugated plate having parallel, longitudinally extending corrugations of a generally trapezoidal cross-section. A layer of concrete which defines the traffic carrying surface of the bridge and a generally flat plate are secured to the corrugated plate. The flat plate can be interposed between the concrete layer and the corrugated plate, or it may be spaced from the concrete layer by the corrugated plate. The flat plate can simultaneously define portions of the corrugated plate. Means is provided for rigidly interconnecting all members of the bridge into a unitary, load carrying structure.

Abstract: Apparatus and method for pouring concrete on a bridge is disclosed employing rail-mounted pouring and related equipment and separate rail-mounted rolling pipe for attachment to a concrete source system located on an approach to the area to be poured. The equipment rail and rolling pipe rail are both mounted on stable overhang brackets located outboard of the area to be poured. A power tractor is also mounted in the approach area on the rolling pipe rail and straddles the vertical reinforcing members located on the outside edges of the bridge deck. The tractor pushes the rolling pipe and permits a flexible hose connection to a stationary concrete pump located on the approach. A spring-loaded telescoping channel connection allows the trolleys on the tractor and the idler trolleys supporting the rolling pipe to be clamped securely to the rail.

Abstract: A device for scraping the inside of pipes clogged with foreign materials is comprised of (1) a mandrel having a conical cam whose top is attached to a mechanical power source and around which is mounted (2) a plurality of annularly expandable scraper elements whose combined outside configuration approximates a tube which can be inserted into the pipe, and whose combined inside configuration approximates an expandable, conical dome into which the mandrel's conical cam is pulled in order to annularly expand the elements of the conical dome and hence expand the plurality of scraper elements as the entire device is pulled through the pipe and (3) means for limiting the annular expansion of the scraper elements.

Abstract: Wellhead supported subsea template apparatus and methods of installing such template apparatus are provided. The template apparatus are each comprised of a central support member adapted to be positioned into engagement with an upper portion of an existing wellhead and to be supported thereon above the sea floor. Attached to the template are a plurality of laterally spaced guide slot members, mechanisms for removably connecting the central support member to a running tool, and mechanisms for preventing the support member from rotating on the wellhead after being positioned thereon.

Abstract: The invention relates to a device for supplying fluid to a tool for breaking solid material, said tool being mounted in a holder, and that a nozzle is arranged in or in connection to the tool. A connection element for fluid transmission is arranged to bridge the opposing contact surfaces on the holder and the machine part in such a way that fluid is prevented to enter between said contact surfaces.