Showing papers on "Screed published in 1997"

Electrically heated paving screed

Abstract: A heated screed assembly (10) for use with a paving machine (12) includes a screed (16). An elastomeric, electrically-powered heating element (36) is carried on the upper surface (28) of the screed. A retaining member (48) is disposed to overly the heating element, whereby the heating element is retained in contact with the upper surface of the screed during operation of the paving machine. Electric power is supplied to the elastomeric heating element by a generator (44).

Portable vibratory wet screed

Abstract: A portable vibratory concrete screed is disclosed. The concrete screed includes a screed blade including a flat bottom wall extending between a front edge of the screed blade and a rear edge of the screed blade. The screed also includes a vibratory assembly, with an eccentric weight, coupled to the screed blade, wherein the eccentric weight rotates in a plane which is oblique to the bottom wall of the screed blade. Finally, the screed includes a handle assembly extending from the vibratory assembly and coupling a motor to the vibratory assembly to drive the eccentric weight and vibrate the screed blade.

Device and method for controlling the application height of a road finisher

Abstract: A control device for controlling the application of a material which is adapted to be applied to a subgrade by means of a road finisher, said road finisher comprising a tractor and a floating screed, which is attached by means of at least one drawarm to the tractor in such a way that said screed is arranged behind said tractor in the direction in which the road finisher is moving when in operation, a first end of said at least one drawarm being secured to the tractor by means of a vertically adjustable coupling device, and a second end of said at least one drawarm being rigidly secured to the floating screed, said control device comprising a device for detecting the height of a screed edge in relation to a reference height, said screed edge being the rear lower edge of the screed in the direction of movement. The control device further comprises a device for detecting the inclination of said at least one drawarm in relation to a reference plane. A device for controlling the height of the vertically adjustable coupling device controls the height of said vertically adjustable coupling device on the basis of the detected inclination and the detected height of the rear lower edge of the screed.

Applicator for wallboard joint compound

Abstract: An applicator for applying joint compound or mud to wallboard has six embodiments with a head, a mud outlet and a mud hose. The applicator has a handle and a control valve for controlling the flow of mud. Each embodiment also has a screed on the head above the mud outlet which extends beyond the end of the head. The screed smoothes down the mud applied to the wall and wipes away any excess mud. The first embodiment has a fan-shaped head with baffles to define multiple flow ports. The second and third embodiments have a rectangular head and a pair of retractable corner stops which align the mud outlets flush with the corners of drywall sections. The third embodiment adds a dispersion mechanism for varying the width of the outlet. The fourth embodiment of the applicator has a wedge-shaped head and a V-shaped screed with flow ports in the sidewalls that are designed to apply mud to right-angled corners. The control valve of the final embodiment has a cylindrical core with a slot which selectively aligns with a slot in the mud chamber. The control valve is operated by a spring-biased lever which contacts the wall. The lever has a pair of arms and a wheel on each arm. The arms extend from an outer edge of the control valve past the mud outlet to automatically open flow when the head is pressed against the wall.

Material flow management means for paving machines

Abstract: Material flow management apparatus for a paving machine having a screed assembly, including at least one pivotally mounted flow control gate operably connected to a selectively controllable actuator for actuating the flow control gate to a flow preventing position and flow permitting positions, the flow control gate mounted immediately adjacent the outer edge of the main body of the screed assembly to variably control the volumetric flow of paving aggregate from the main material reservoir preceding the screed main body and ensure a suitable volumetric material supply to the secondary material reservoir preceding the variably extensible screed extension body.

Control system and method for operating an asphalt paver screed burner system

Abstract: In one aspect of the present invention, an automatic screed temperature control is disclosed. The control senses the screed temperature and compares the screed temperature to a lower set point. In response to the screed temperature being less than the lower set point, the control causes fuel to dispense into the combustion chamber and subsequently causes the fuel to ignite in order to heat the screed. The screed is heated until the screed temperature becomes greater than an upper set point.

Heating device for screed plate in screeding machine

Abstract: PROBLEM TO BE SOLVED: To provide a screed blade heating device capable of heating a screed blade in a screeding off machine efficiently in a short time and causing little noise pollution. SOLUTION: A screeding machine screeds an asphalt composite material laid on a road surface, while pressing the material with a heated screed blade. Then a high frequency induction coil 2 is fixed on the upper surface of the screed blade 1, and a high frequency induction heating mechanism IH is provided which passes a high frequency current to the high frequency induction coil 2 to heat the screed blade 1 by the Joule heat generated. In this case, a spacer 3 made of an insulator of good heat resistance, particularly ceramics, is interposed between the upper surface of the screed blade 1 and the high frequency induction coil 2, the screed bade 1 is parted into two along a direction perpendicular to the advancing direction of the screeding machine, in which case the high frequency induction heating mechanism IH should be provided on each of the parting surfaces for increased efficiency. COPYRIGHT: (C)1998,JPO

Vibratory screed assembly for an asphalt paving machine

Abstract: A screed assembly is disclosed for an asphalt paving machine that is used to pave the surface of a roadway with asphalt concrete paving material. This screed assembly includes a frame portion that is adapted for attachment to the paving machine, and a vibratory screed portion that is adapted for attachment to the frame portion. The vibratory screed portion includes a screed plate that is disposed towards the surface of the roadway, and a vibratory assembly which is mounted to the screed plate so as to impart vibration thereto. This vibratory assembly includes an elongate shaft, means for rotating the shaft, and an eccentric weight that is mounted on the shaft, which weight has a non-symmetrical distribution of mass about the shaft so that vibration will be created upon rotation thereof. The screed assembly also includes means for isolating the vibratory assembly so as to limit the transmission of vibration created thereby to the frame portion.

Apparatus and method for securing a screed plate to a frame member of a screed assembly

Abstract: An apparatus and method for securing a screed plate to a frame member of a screed assembly is disclosed. A leading edge portion of the screed plate is secured to the frame member by a number of fastening assemblies each of which includes an upper fastening block, a lower fastening block, and a bolt. The upper fastening block is welded to the frame member, whereas the lower fastening block is welded to the screed plate. Rotation of the bolt causes the fastening blocks, and hence the frame member and the screed plate, to be secured to one another. The bolt is disposed at an angle relative the screed plate thereby allowing access thereto from a rear portion of the screed assembly. Such a configuration allows the screed plate to be exchanged without the need to remove the screed assembly from the tractor associated with the paver. Such a configuration further allows the screed plate to be exchanged without the need to remove a number of deflector plates associated with the screed assembly.

Paving machine for forming porous pavement construction

Abstract: A paving machine forms aqueduct channels using a screed assembly having elongated forming arms, and deposits pavement material onto these arms. As the machine advances, channels are formed in the pavement layer. This results in a porous pavement material having a number of aqueduct channels formed underneath the pavement surface, so that water can percolate downward into the pavement and enter the channels.

Side plate of asphalt finisher for preventing fixation of composite material

Abstract: PROBLEM TO BE SOLVED: To prevent a composite material forming the end of a pavement body from sticking to side plates, by heating the side plates arranged at both ends of the screed at least from the lower part thereof. SOLUTION: A hollow part 10a is formed at the lower part of the side plate 10 extended forward from the end of a second extensible screed 22 and a hollow space 10b is formed at the upper part of the forward side thereof. Hot air from a burner 224 passes through the hollow part 222a of a base plate of the screed 22 and a part thereof enters the hollow part 10a through a duct 61 and rises up zigzag in the hollow part 10b along baffle plates 100, 101 and it is discharged from the exhaust opening 103 to the outside. In this time, the plate 10 is heated from the inside. In this way, the temperature of the composite material forming the end of the pavement body is sufficiently kept to prevent the material from sticking to the side plate and the flowability of the composite material into the screed is improved. And the rolling in the axial end side can be extremely fovarably carried out and further, as the composite material is prevented from sticking to the lower face of the side plate, the partitioning property of the composite material can be improved. COPYRIGHT: (C)1999,JPO

Concrete leveling laser screen machine with concrete coarse leveling device and construction method for concrete floor

Abstract: PROBLEM TO BE SOLVED: To mechanize the whole work by providing an auger traversed in the direction perpendicular to the advancing direction while being rotated and coarsely leveling the concrete placement face in advance in the front of the advancing direction of a laser screed machine. SOLUTION: A laser screed machine 5 filling and compacting concrete via the vibration of a screed plate is provided with a laser transmitter 8 and a laser receiver 7 for a height adjustment. Skid devices 9 supporting the machine weight and slid on reinforcing bars 1 are provided at both end sections of the screed machine 5 moved and advanced on a concrete placement face 4. An auger 13 rotated and reciprocated by a vibration exciting shaft 6 rotatively driven by a gasoline engine E, leveling the concrete placement face 4, and thrusting excess ready-mixed concrete forward for coarse leveling is provided in the front of the advancing direction perpendicular to the advancing direction of the screed machine 5. The whole concrete work can be mechanized, the number of workers is reduced, the execution time is shortened, and the finishing accuracy can be improved.

Executing method of surface finishing layer

Abstract: PROBLEM TO BE SOLVED: To strengthen the adhesive force against a road face even when the surface layer is thin, by scattering a lot of adhesive on the road face and immediately laying down a pavement material so that it is within specified times of the maximum granular size of aggregate in the pavement material. SOLUTION: An improved asphalt emulsion adhesive is scattered onto a road surface from a scatter device 9 of a pavement machine 1 and immediately after that, the pavement material is spread breadthwise by an expanding screw spreader 10 and then compacted flat by a vibratory finishing screed 11. A hot pavement material is laid and leveled on an adhesive layer within 5 seconds to accelerate the decomposition of a decomposing emulsion and give an quick- adhesive property. As a pavement material, an unscreened asphalt mixture is used. The open-graded mixture is firmly fixed by use of a lot of adhesive material in which the evaporated residue of the adhesive is 10-60% of the binder of the pavement material and the evaporated residue is 0.3-1.2kg/m2 . The finished thickness of the finished surface layer must be within 2.5 times as large as the maximum granular size.

Mixtures of materials settable on exposure to atmosphere

Abstract: A settable mixture comprises liquid polybutadiene, a flow-enhancing liquid, and particulate material The mixture may be used as a substrate screed and/or filler for paving, wall and floor elements such as tiles, cobbles, concrete slabs The mixture can be bagged in a substantially oxygen-free atmosphere ready for use

Slip form paver for road pavement

Abstract: PROBLEM TO BE SOLVED: To lay out a high quality concrete pavement capable of being treaded on immediately after the placement of concrete based on a slip form paver. SOLUTION: In a concrete road constructing slip form paver, at least one transverse direction distribution device Q1, one stripper device 21, one strip form G1 and one pavement screed are provided on a support frame T. The concrete pavement screed is a high compaction pavement screed H1 where the screed is floatingly pivoted on a towing point 9 of the support frame T at least by a pair of right and left extension bars 11 laid out substantially on a base P. The towing point 9 is provided separately in front of the screed.

Movable canopy for road paving vehicle such as asphalt finisher

Abstract: PROBLEM TO BE SOLVED: To protect an operator from solar radiation, rainfall, and the like by making one canopy usable in common for both the driver's operation and screed part operation. SOLUTION: In a road paving vehicle such as an asphalt finisher that can be operated by one man, a canopy 3 mounted on a vehicle body is rotated using link mechanism so as to be able to use one canopy 3 in common for a vehicle driver's seat A and a screed operating part B. The link mechanism is composed of two links 4, 5 with one ends thereof respectively connected to the bracket 2 side at a rear part of the vehicle driver's seat A and with the other ends respectively connected to the canopy 3 side by pins 7, 9.

Plasterers, renderers or screeders aid

Abstract: A profiled prefabricated plastics sheeting is moulded so that the reverse side has an open mesh structure, and the front side has pinnacles which project from this mesh The reverse side of the sheeting (mesh side) is fixed to the substrate to be plastered/rendered/screeded The plaster/render/screed is then applied to the front of the sheeting (pinnacled side) in a conventional way, and the special pinnacled surface texture ensures a constant thickness of application, and even surface finish (the trowel gliding across the tips of the pinnacles) Because the sheeting has an open structure (in the form of a mesh), when the plaster/render/screed passes between the pinnacles it also passes through the mesh and then comes into direct contact with the substrate behind On vertical faces (iewalls) the pinnacles will prevent the plaster/render from slumping after application The open texture reverse side of the sheeting can also be ribbed to give rigidity and strength In the case of floor screeding, the sheet is secured to the floor substrate (mesh side facing the substrate) and the screed is applied to the pinnacled side of the sheet and trowelled and levelled

Movable control device of road paving vehicle such as asphalt

Abstract: PROBLEM TO BE SOLVED: To perform operation on a vehicle driver's seat and operation on a screed part by means of one control device by making the control device mounted on the vehicle driver's seat movable to the screed part through a link mechanism. SOLUTION: In a road paving vehicle such as an asphalt finisher, a control device 1 mounted on a vehicle driver's seat 7 is rotationally moved through a link mechanism, and can be moved to a screed part B. Hereby, both operations of operation on the vehicle driver's seat 7 and operation on the screed part B can be performed. The link mechanism is constituted so that the one end of a reverse chevron shaped arm 2 is through one pin 3 and the vicinity of the end is through the other pin 5, respectively combined with the control device 1 side, and the vicinity of the other end of the arm 2 is combined and held with a machine main body part A through a pin 4. The pin 5 is drawn out and inserted into a pin hole 6 separately provided on the control device 1, the control device 1 is rotationally moved on the screed part B side centering around the pin 4, and hence operation can be performed on the screed part B side.

Wear resistant slope adjusting assembly for a screed

Abstract: A wear compensating device for a slope adjusting assembly for an extendable screed section of a paver includes a saddle support assembly on the screed, for supporting an extendable screed section, a saddle assembly on the saddle support assembly for carrying extendable guide members to support the extendable screed section, and an adjustable cam follower positioned between the saddle assembly and the saddle support assembly for providing rolling contact between the saddle assembly and the saddle support assembly, to maintain alignment between the saddle support assembly and the saddle assembly.

Floor covering panels forming a screed or tiling

Abstract: Rigid panels comprising uniformly distributed perforations so that less or no pressure need be exerted to seal the panel, whereby panels that are both large (1 m ) and thin may be achieved, are disclosed. A sealing method wherein mortar or adhesive is scraped through the perforations is also disclosed.

Hollow floor in building

Abstract: The hollow floor or false floor is used in a building. The floor may be covered with large square or rectangular tiles (4) which rest on a thin layer (11) on top of an array of thick triangular tiles or slabs (1). The triangular slabs are supported by a bucket-shaped feet (2) under their vertices. The buckets are filled with a material which sets hard when water is added, e.g. gypsum or cement. An elastic, e.g. foam layer is place on top of the gypsum or cement to support the floor. The rough floor or foundation (6) may be levelled using a screed (7). Hollow kerbs (14) are placed at the edges of the floor and the spaces at the edges of the tiles are filled in with poured grout or floor plaster (15). There is a flexible edge strip at the extreme edge of the floor.

System for supply of dry ready-mixed floor screed material - using silo carried horizontally on vehicle and tilted into vertical operating position on site supplying screed material to mixer

Abstract: The method involves a silo (2) containing dry ready-mixed floor screed material driven to site on a vehicle (1) in a horizontal transport position and tilted into a vertical operating position. From here the screed material is fed via the silo outlet to a mixer, mixed with water and supplied under pressure to the work site along tubing. The vehicle remains on site during the screeding operation. Its driver or operator can take control of the mixing and supply operation, possibly using water tanks and energy sources attached to the silo vehicle.

A slurry screed construction with reduced curing time and process for manufacturing the same

Abstract: The wire length, dia. and material are selected to generate a heating power of no more than 25 Watts per metre from an alternating current of 250 Volts and 50 Hz. The distance between each two wires is in the range from 15 to 25 cm. The heating power of the heating wires lies in the range from 50 to 120 Watts per square meter. The heating wires consist of several twisted single wires made of metal alloys in accordance with DIN 57 253 and VDE 0253.