Showing papers on "Screed published in 1998"

Transformable two-person floating screed with automatic grade control

Abstract: A two-person floating screed with laser-operated, automatic grade control apparatus for finishing plastic concrete is transformable for different operations. A rigid, transversely oriented float mounts a strikeoff for initially contacting and leveling rough, freshly poured concrete. In one form of the invention the screed merely floats upon the concrete surface. In an alternative embodiment, lightweight ski assemblies support the screed over the subgrade. The skis secure upwardly projecting screw jacks that removably couple to the screed and control elevation of the transverse float in response to laser signals. Each worker has a separate handle mechanism pivotally associated with the float. Separate, light-weight power sources are carried by each worker in a suitable backpack to power the screw jacks. Laser sensors mounted on vibration dampened stanchions emanating from the float respond to external laser beacons and display grade information so that the workers can make manual adjustments. With the ski assemblies attached, the laser system automatically controls float elevation by activating the screw jacks so that the extend or contract. The float preferably comprises twin sections that are secured together in the two person mode. When uncoupled, the float divides into a pair of separate, compact one-person floating screeds.

Linkage mechanism for an extendable asphalt paver screed

Abstract: An asphalt paver screed includes a linkage mechanism connecting a main screed and at least one extender screed. The linkage mechanism controls movement of the extender screed relative to the main screed (via a pair of upper and lower frames connecting the extender screed and main screed) along three generally perpendicular axes. The linkage mechanism includes a plurality of links with at least one elongate lateral link extending along a lateral axis generally parallel to a first horizontal axis, at least one elongate fore/aft link extending along a fore/aft axis generally parallel to a second horizontal axis, and at least one selectively length-adjustable link extending along an axis generally parallel to a third vertical axis. The length adjustable link permits selective adjustment of vertical spacing and sloping between the main screed and the extender screed.

Vibratory screed device for levelling freshly poured concrete surfaces

Abstract: A vibratory screed device for levelling freshly poured concrete surfaces consists of an elongated vibrated screed beam delimited by a flat underside, a first and a second longitudinal side and a top; of a vibratory assembly for bringing the vibrated screed beam into vibration; and of a handle assembly which can be fixed in a detachable manner to the vibrated screed beam at an upward slope with respect to the flat underside. The first and the second longitudinal side are differently profiled and each has a surface suitable for vibratory levelling. The handle assembly can be fixed to the vibrated screed beam in two positions, in the one position sloping upwards obliquely at the first longitudinal side in order to make the first longitudinal side the active surface and in the second position sloping upwards obliquely at the second longitudinal side in order to make the second longitudinal side the active surface. The second and the first longitudinal side are in particular profiled differently to one another such that they form surfaces which act in a different way to one another.

Edge compacting device for an asphalt paver

Abstract: An asphalt paver for applying a mat of asphalt material as the paver is moved along a path includes a frame, a compacting screed having rotatable vibrator shaft, and an edge compactor attached to the outer end of the compacting screed. The edge compactor includes a pivoting nose piece or tamping bar having an outer end generally overlying an edge portion of the asphalt mat, a rotatable shaft connected to the vibrator shaft, and a rod eccentrically mounted to the rotatable shaft and secured to the tamping bar outer end for pivoting the tamping bar in response to rotation of the rotatable shaft. The oscillating movement of the tamping bar over the outer edge of the asphalt mat compacts the edge of the asphalt mat as the paver is moved along the path.

Height control mechanism for strike-off plate of an asphalt paver screed assembly

Abstract: A height control mechanism for a strike-off plate of an asphalt paver screed assembly is disclosed. The screed assembly is pivotally connected to a pair of tow arms of an asphalt paver and has at least one main screed unit and at least one screed extension unit mounted in front of the main screed unit. The screed extension is laterally movable beyond one end of the main screed unit. The screed assembly also has an adjustment mechanism for adjusting the pitch angle of the screeds relative to the ground. The height control mechanism includes a support mechanism adapted to mount the strike-off plate in front of the main screed unit at a position ahead of the screed extension unit. The height control mechanism also includes a linkage arrangement adapted to automatically control the height of the strike-off plate upon the adjustment of the pitch angle of the screeds.

Manual screeding system

Abstract: A manual screeding system for use in leveling freshly poured concrete which includes a frame for providing structural integrity to the screed. The screeding system includes handles, attached to the frame, for manually holding and manipulating the screeding system during the screeding process. A support, attached to the frame, is provided for preventing the screeding system from rotating about the handles during the screeding process. The support is structured to engage the forearms of the user when the screeding system is in use. A pair of bracket assemblies are provided for securely holding a screed board to the frame.

Vibrating screed and method of making same

Abstract: A vibrating screed for processing a floor layer, more particularly a so-called vibrating beam, of the type including a vibrating board ( 2 ), a vibrating mechanism ( 3 ) cooperating with the vibrating board, and a handle ( 4 ) whereby the vibrating mechanism comprises an eccentric ( 7 ) seated in bearings ( 5-6 ) and a motor ( 8 ) for driving the eccentric, wherein the bearings and the eccentric are fixed in a split body by means of a clamping mechanism on the split body.

Two-stage paving screed extension

Abstract: An extension screed assembly (18) for use with a paving machine (14) having a main screed (12) includes a first sliding back board (20), a first linear actuator (22) coupled to the main screed and the first sliding back board, a first extension screed (30), and a second linear actuator (32) coupled to the first sliding back board and the first extension screed. The first linear actuator displaces the first sliding back board relative to the main screed along the length of the main screed. The second linear actuator displaces the first extension screed relative to the first sliding back board along the length of the main screed. When two extension screeds are provided, one on each side of the main screed, and are fully extended, an effective paving width of the main screed doubles.

Self contained mobile plant for manufacture of floor screed mortar

Abstract: The plant has individual storage containers (4,6,48,64) for binder, sand, water and additives connected by delivery tubes (45,36,58,62,63,56) to a mixer. The delivery of the constituents is controlled by an on board computer. The storage containers are also used to transport the constituents. The containers are in fixed positions on the vehicle and are part of an enclosed body. A buffer container (53) for the mixed mortar is linked to the delivery pump (9), all contained on the vehicle.

Screed device in paver

Abstract: PROBLEM TO BE SOLVED: To obtain twice or more of paving width of a main screed width by elongating a pair of left-right sub-screeds disposed on the rear-section side of a main screed while accurately setting the length of expansion and contraction easily by simplifying the expansion and contraction mechanism, and to conduct paving operation efficiently. SOLUTION: A pair of left-right movable supporting frames 8, 9 are arranged to a fixed supporting frame 7, and a main screed 1 is hung to the fixed supporting frame 7 and sub-screeds 2, 3 having width from the half of the main screed 1 to the same width to the movable supporting frames 8, 9 respectively. A pair of the sub-screeds 2, 3 are disposed on the rear-section side of the main screed 1, and shrunk compactly under the state in which the sub-screeds 2, 3 are superposed mutually before and behind under a normal state, while two two-stage type hydraulic cylinders 10, 11 for expansion and contraction are arranged bilaterally to the fixed supporting frame 7 of the main screed 1, and the movable supporting frames 8, 9, from which the sub-screeds 2, 3 are hung, are expanded and contracted and moved in the paving width direction respectively by these two-stage type hydraulic cylinders 10, 11.

Self-propelled concrete finisher

Abstract: PROBLEM TO BE SOLVED: To provide a self-propelled concrete finisher which is useful for carrying out concrete thin layer overlay pavement works where the installation of rails for the travel of a machine is difficult and lessening shuttering placement work on both sides or one side of the course of advance in order to form pavement shoulders. SOLUTION: A self-propelled concrete finisher is equipped with a device to supply concrete materials (carriage such as a conveyor), a device to place and spread supplied materials (screw spreader 7), a device to tamp and scrape spread materials (tamping vibrator 8 and a mold plate 9) and a device to smoothen the surface of scraped concrete (floating screed 10) on the rear part of a traveling chassis 4. Such composition eliminates the need for a large crane for carrying the concrete finisher to construction sites, installing rails previously necessary for placing and scraping concrete, relieves workers of working time and hard labor necessary for rail installation, and thereby ensures cost reduction and lower risk of accident.

Paving construction device of elastic paving materials

Abstract: PROBLEM TO BE SOLVED: To provide a paving construction device capable of spreading and smoothing a paving material at uniform thickness having good flatness with a roller while it is compact and simple construction, executing pavement without causing lateral slippage by accurately corresponding to curves in a construction site even in the case there are curves therein, and freely and simply corresponding to variations in the width of the pavement from relatively narrow width to broad width. SOLUTION: A pair of traveling sections 2 and 2 having Catapillar (registered trade mark) 16 are connected to both sides of a main body frame 1, and a screed plate 3 is mounted to the front of the main body frame 1 so as to make it possible to adjust the height Iron sections 4 (4a and 4b) are hung on the main body frame 1 just behind the screed plate 3 so as to make it possible to adjust the height, and a construction width controlling plate 3c extended in the direction of travelling is mounted to the front section of the screed plate 3. COPYRIGHT: (C)1999,JPO

Ski assembly for a screed

Abstract: A power screed sled apparatus is provided including a power screed including an elongated frame with a pair of ends. Also included is a pair of skis each coupled to an associated end of the frame of the power screed for transporting the same.

Spreading leveling material invasion prevention device in screed device

Abstract: PROBLEM TO BE SOLVED: To effectively prevent composite material from invading a clearance changing with expansion operation of the screed device of an asphalt finisher and secure flatness of a pavement face. SOLUTION: In this spreading leveling material invasion prevention device, a clearance adjustment mechanism 21 is provided between a main screed side cover 14 and an expansion part screed deflector 12. The clearance adjustment mechanism 21 is provided for preventing invasion of asphalt composite material into the inside from a clearance 22 widened and changed with movement of a widenner composite material gate during expansion operation of a screed device. A support plate 23 is fixed to the main screed side cover 14, and a regular cover plate 24 is rotatably attached to the support plate 23 by a shaft 25. The cover plate 24 is urged clockwise by a pair of torsion coil springs 26, 27 fitted to the shaft 25 and abutted on the widenner composite material gate 13. When the clearance 22 is widened by expansion movement of the widenner composite material gate 13, the cover plate 24 is rotated clockwise and invasion of the composite material is prevented.

Screed device for asphalt finisher

Abstract: PROBLEM TO BE SOLVED: To avoid paving compound quantity from becoming less on the right and left end areas of a road when the road is paved with asphalt compound using an asphalt finisher. SOLUTION: An end screed device 8, which is provided with an extension/ auxiliary screed device adjoining thereto, is provided with an inclined side 9b, which is inclined outward to the right and left more at the lower part than the upper end overlapping 9 in a plan view, and a movable side plate 10 provided in a movable manner with respect to the inclined side 9b, while a lower part 10a of the movable side plate 10 is positioned more outward and downward than the right and left ends of the end screed plate 9b. A compound narrow- down plate 9e, which is inclined with its front high and rear low further at the front than the end screed plate 9d and extended from the inclined end to the front end of the end screed plate 9d, is formed.

Paving controller for finisher

Abstract: PROBLEM TO BE SOLVED: To lower the cost by detecting height of a road surface so as to operate a light emission detecting contactless switch, and automatically adjusting angle of screed through a relay. SOLUTION: A radial rotary plate 7 is fitted to a rotary shaft 5, and two light emission detecting switch 8 are arranged at a right angle against the rotary plate 7. At the time of adjusting sensitivity, a sensitivity adjusting knob 9 is operated so as to move the switch 8 in the direction at a right angle against the axial direction of the rotary shaft 6. A detecting ski 5 provided in the shaft 6 is vertically moved in response to a height of the road surface so as to rotary the rotary plate 7, and while any switch 8 of the upper and the lower responses to the rotation, and the switch is thereby turned on. Continuously, solenoid valves 12, 13 are operated through a contactless relay 10, an arm of a finisher main body 1 is vertically moved so as to move the angle of screed, and thickness of paving is thereby controlled. With this structure, control is performed without using expansive electronic parts, and the cost can be lowered. Since a contactless switch is used, the lifetime of the controller can be remarkably prolonged.

Building component with cementitious coating

Abstract: A building exterior finishing component includes a core of an insulating material. There is a coating on the core. The coating is a light weight cementitious mixture including concrete with a polymer resin and unwoven fibers disbursed throughout the coating. The component is made by forming a core of an insulating material having a predetermined shape. A cementitious mixture of water, aggregate, a polymer resin and unwoven reinforcing fibers is coated on a portion of the core. The coating is allowed to set on the core forming a hard surface on the portion of the core. Typically the component is made at a first site by coating an insulating core with cementitious mixture and allowing the mixture to dry. A building is erected at a second site. The component is transported from the first site to the second site and connected to the exterior of the building. There is also an apparatus for making building components. A dispensing device dispenses a cementitious mixture onto a solid core. A screed is spaced-apart from the core. A conveyor moves the core relative to the screed, thereby coating the core with the cementitious coating.

Screed device in asphalt finisher

Abstract: PROBLEM TO BE SOLVED: To adjust paving width by a screed accurately and easily by a simple mechanism in a screed device for an asphalt finisher conducting pavement on a road. SOLUTION: Pairs of left and right first sub-screeds 2, 2 and second sub- screeds 3, 3 are disposed on the rear side of a main screed 1 under the state, in which the screeds 2, 2 and the screeds 3, 3 are superposed mutually in the longitudinal direction, while a two-stage type hydraulic cylinder 7 and fixed guide pipes 8, 9 are installed in parallel in a support frame 4 for the main screed 1 in the direction of paving width, and a mounting frame 5 for the first sub-screeds 2 is fixed and supported onto the inner-outer both end faces of first-stage expansion guide pipes 8a, 9a inserted into the fixed guide pipes 8, 9. On the other hand, a mounting frame 6 for the second sub-screeds 3 is supported at the outer end sections of second-stage expansion guide pipes 8b, 9b slidably inserted to the first-stage expansion guide pipes 8a, 9a, and the first and second sub-screeds 2, 3 are elongated in the direction of paving width respectively by the first-stage expansion rod 7a and second-stage expansion rod 7b of the second-stage type hydraulic cylinder 7.

Original reader for electronic copying machine

Abstract: PROBLEM TO BE SOLVED: To provide an original reader for an electronic copying machine, in which parallel and height alignment of an original platen glass is easily conducted. SOLUTION: This original reader is provided with a height adjustment device 31 for adjusting the height of an original platen glass 30 fixed to a device main body frame 1, with respect to the device main body frame 1, a through- hole 30a is formed on the original platen glass 30, the height adjustment device 31 is made up of an insert fix thread 39 inserted and fixed to the through-hole 30a and a height adjustment bolt 41 screed to the insertion fixed thread 39.

Construction method for spreading asphalt mixtures and spreading machine

Abstract: PROBLEM TO BE SOLVED: To provide a spreading machine of asphalt mixtures which sprays liquid or solid materials without using another machine when liquid or solid materials need to be sprayed on a surface spread by a screed for a certain purpose such as finish. SOLUTION: A spreading machine of asphalt mixtures includes a traveling vehicle 1 which is provided with a bar feeder 3 feeding asphalt mixtures on a base course 6 from a feeding part, and screed 5A and 5B spreading asphalt mixtures feeded on the base course 6 by the bar feeder 3. Then, spraying devices 7A and 7B spraying liquid or solid materials are provided behind the screed 5A and 5B.

Laying carpets and other floor covering materials with or without using an adhesive

Abstract: A cement-based trowelling screed for laying flooring with or without a resin-based adhesive contains 2,3,4,5-tetrahydroxy-adipic acid as liquefier, a low-emission carboxylated butadiene-styrene copolymer to provide flexibility and a mixture of milled hard fiber latex and other fibers. A method (V1) for laying flooring comprises (1) mixing a known trowelling compound in the form of a dry mortar mix based on Portland cement, high-alumina cement and calcium sulfate (Type K expanding cement capable of forming an ettringite phase) with (based on total dry mix) 0.15-1.0 wt% 2,3,4,5-tetrahydroxy-adipic acid (THAA) as liquefier and 10-20 wt% of a mixture of (a) milled hard fiber latex, (b) glass and/or polymer fibers, (c) amino-acid polycondensation fibers and (d) polyurethane foam (2), making the dry mortar mix more flexible with 4-8 wt% of a saponification-resistant dispersion of a carboxylated butadiene-styrene (CBS) copolymer with a very low emission value (not more than 300 micro-g/m after 10 days), (3) making up the mix with water, (4) spreading the wet mix on the substrate and drying it to form a thin screed with improved sound proofing against footstep noise, (5) applying a low-emission (not more than 300 micro-g/m ) solvent-free synthetic resin dispersion with a water content of not more than 15 wt%, containing a tackifier based on natural resin ester and/or synthetic resin together with 1-5 wt% emulsifier based on sulfated and/or sulfonated hydroxy-octadecenoic acids and/or their high-molecular weight triglycerides, the tackifier being adjusted to pH 4-6, and (6) laying the floor covering on this resin coating. Another version (V2) of the process comprises mixing the cements etc. as above with 0.5-1.0 wt% THAA, making up with water, spreading this mix on the substrate and then forming a mechanical (adhesive-free) bond between flooring and base by arranging for the fibers (mixture a-d; with 0-100% b based on a) to stick out of the screed. Independent claims are also included for (A) a dry screed mix as above containing 0.15-1.0 wt% THAA as liquefier; (B) a dry screed mix containing 0.15-1.0 wt% THAA and 10-20 wt% mixture (a-d) as above; (C) aqueous, non-ionic, stabilized, low-emission, saponification-resistant dispersions of CBS copolymers containing 10-30 wt% mixture (a-d) as above with a content of 0-100% (b) based on (a).

Heater of screed

Abstract: PROBLEM TO BE SOLVED: To provide a heater which heats a sub-screed as well as a main screed equally and has excellent maintenance performance. SOLUTION: A heater of screed includes a sub-screed 22 mounted slidably adjacent to a main screed 21, and sends hot air of an air-heating type burner 24 heating the main screed 21 to the sub-screed 22. A first flue 23 mounted along the main screed 21 and a second flue 27 mounted along the sub-screed 22 are communicated with a connection duct 30. The connection duct 30 is comprised of a branch duct 30a extending from the first flue 23, a slide duct 30c engaged slidably to a slide base plate passed through by the other end of the branch duct 30a, and a communicating duct 30d communicating the slide duct 30c and the second flue 27.

Automatic step adjustment device of asphalt finisher and the like

Abstract: PROBLEM TO BE SOLVED: To save the labor required of an operator and enhance controllability by automating manual step adjustments. SOLUTION: In an asphalt finisher or the like, an automatic step adjustment device comprises an angle sensor 1 for detecting the attack angle of a front screed, an interface part 2 which feeds signals of the angle sensor 1 to a computing unit 3, a ROM 4 in which the relationship regarding step between the attack angle and the front and rear screeds is stored in advance, and an actuator 6 which moves the rear screed up wand down via a drive 5 on the basis of results computed by the computing unit 3. The height of the rear screed is changed according to information about the relationship and the attack angle of the front screed, which is stored in the ROM 4 in advance.

Movable controller of road construction vehicle such as asphalt finisher

Abstract: PROBLEM TO BE SOLVED: To provide a structure which facilitates driving operations even from above a paved portion by enabling a controller to slide to the back (operator side) and be tilted downwards. SOLUTION: In a road paving vehicle such as an asphalt finisher, a controller 1 mounted in the driver's seat of the vehicle is designed to be capable of moving to a screed part B when rotated via a link mechanism 2, so that an operation at the driver's seat of the vehicle and a driving operation at the screed part B are made possible using one controller 1. In that case, the controller 1 comprises a lower controller 10 and an upper controller 11 placed on the lower controller 10 and equipped with a handle 20, with the upper controller 11 designed to be capable of moving into a sliding state C from the screed part B by sliding back and forth on the lower controller 10 and of converting to a tilted state D by tilting downwards from the sliding state C.

Floor or work surfaces

Abstract: A horizontal surface, in particular a tiled surface, e.g. floors, kitchen tops and other working surfaces, wherein the tiles (11) are laid on a substrate (14) adjacent to each other, and the spaces (12) between adjacent tiles (11) are filled with a material (13) consisting of ground glass or a mixture of ground glass and sand. If required, the tiles may be laid on a leveling screed (15) which may be formed as a mixture of ground glass and sand.

Paving method with asphalt mixture

Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of crescent opening from occurring adjacent to a coarse grain positioned on the surfrace when pavement is executed with an asphalt mixture. SOLUTION: When pavement is executed with an asphalt mixture, a paving machinery having two narrow plate-like tampers 1 and 2 arranged directly back and forth each other in the direction of movement, provided with measuring slopes 4 respectively and operated in the opposite direction and a screed 3 adjacent to the tampers 1 and 2 is used. The lower dead center of the front tamper 1 in the direction of movement is so set that it approximately coincides with the upper dead center of the rear tamper 2 in the direction of movement, and pavement is executed with the asphalt mixture consisting of high percentage of coarse grain and, at the same time, coarse grain without middle grain size or low percentage of coarse grain.

Spreading and leveling machine for asphalt piled timber

Abstract: PROBLEM TO BE SOLVED: To carry out spreading and leveling work for asphalt piled timber even when a roadbed is wet due to rainfall, etc., by providing a duct structured suction nozzle on the front of a spray nozzle to spray emulsion by connecting outer ends to each other. SOLUTION: A self advancing travelling vehicle 1 is constituted to spread and level asphalt piled timber stored in a hopper 2 by a screed 5 by delivering it by a delivery device 3 while spraying emulsion on a roadbed 6 from a spray nozzle 4. A large number of nozzle holes provided on a lower surface of a duct structured suction nozzle 10 provided in the immediate front of the spray nozzle 4 are communicated to a blower unit through a flexible suction hose, a cyclon type steam separator, a filter, etc. The suction nozzles 10 and the spray nozzles 4 provided free to extend and contract by separating them in pairs left and right and front and rear are supported on a side plate of the screed 5 on their respective outer ends. Consequently, it is possible to prevent damage of quality by removing moisture on the roadbed 6 and to complet pavement in a short period of time.

Indication and control system for finisher

Abstract: PROBLEM TO BE SOLVED: To easily adjust a screed by attaching this system to a finisher in which an automatic controller can not be used, by converting a rotation to electric signals after the levels of a road face have been converted into the rotation and transferring the rotary angle to the indication board installed in the finisher body. SOLUTION: A plurality of cams 6 are attached to a rotary shaft 5 while shifting the their angles little by little from the right and left zero positions respectively. As many microswitches 7 as the number of cams 6 are arranged on the cams 6 and opened and closed one after another by the rotation of the rotary shaft 5. The combined cams 6 and switches 7 are set at the right and left hands around the rotary shaft to cope with the right and left rotations. A detection ski 4 detecting the level of a road face or the like and converting the upward or downward movement to the rotation and transferring the rotation to the shaft is provided in the rotary shaft 5. And hence, the thickness of a pavement can be measured by detecting respective angles of the cams 6 through the switches 7 and displayed on the indication board installed in the finisher body through cables.

Paving controller guide frame for finisher

Abstract: PROBLEM TO BE SOLVED: To avoid the influence of an uneven road surface for obtaining the even finish of a pavement by setting a sensor for a controller provided in a finisher on a frame attached to an arm with a ski provided at its tip and the other end used as a shaft. SOLUTION: A frame 3 is attached to an arm directly connected to a screed with one end used as a shaft, and a sliding ski 4 is attached to the other end. A sensor is mounted near a shaft attached to the arm in the frame 3. In order to enlarge the absorbing effect of an unevenness, a position where the sensor is mounted is better to be near the shaft. During working, the finisher 1 is set up in the state of work start, and the sensor of the controller 2 is mounted on the frame 3 to regulate a predetermined thickness. The most unevenness of the pavement is thereby absorbed to facilitate an even finish through easy work. Thus the quality and efficiency of paving for imperfect road surface or the overlay of existing pavement can be improved.