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Showing papers on "Screed published in 1999"


Dissertation
01 Jan 1999
TL;DR: In this paper, the effect of non-structural components and human-structure interaction on the overall floor vibrational behavior is investigated. But contrary to popular belief, merely the presence of nonstructural component does not necessarily enhance the dynamic behaviour of the system.
Abstract: Prestressing and the advent of high strength materials enable the construction of more slender floor slabs with lower values of natural frequency and damping. Under certain circumstances, the vibrations due to forcing frequencies of normal human activities can be annoying to the occupants. Since the occupants are both the source and the sensor, the vibration cannot be isolated and must be controlled by the structural system. At present, there is a limited knowledge about the overall dynamic characteristics of such concrete slabs, including contributions from individual structural and non-structural components. An extensive programme of modal testing on a slender one-way spanning 50% scaled post-tensioned concrete slab is described. Testing was performed using electromagnetic shaker, instrumented hammer, heeldrop, and walking excitations, to determine full floor dynamic characteristics. The tests investigated the effect on vibration performance of the level of prestress, and of various non-structural additions, including vibration absorbers and effect of occupants. It was found that an increase in prestressing force increases natural frequency and decreases damping due to closing up of microcracks. A model is presented to reflect these changes in terms of effective second moment of area. Cantilever partition tests showed energy to dissipate by swaying, and full-height partitions were seen to act as line supports leading to a significant stiffening of the slab. Analytical models are derived for both forms of partitions. Tests with false floors showed a significantly higher increase in slab damping when the floor panels rested on the pedestals, as opposed to being rigidly fixed to them. Although the addition of viscoelastic screed layers were not seen to have great effect in damping, an analytical model is derived which shows the advantages of using such layers. A TMD system was designed and installed on the floor, using plywood sheets, which led to a reduction in vibration response by as much as 80%. A theoretical model is derived to represent the TMD results and a design criterion is suggested. Finally, the effect of human-structure interaction is investigated. An analytical model shows the natural frequency of the body to be 10.43Hz with a damping of 50%. Results are also reported of tests on a full-scale field slab, confirming some of the findings of the model slab experiments. Broadly, the results show that contrary to popular belief, merely the presence of non-structural components does not necessarily enhance the dynamic behaviour of the system. The design of these components and nature of their installation are important factors affecting their contribution to the overall floor vibrational behaviour.

43 citations


Patent
12 May 1999
TL;DR: In this paper, a paver and a corresponding loader each have a chassis (1) which is provided, at front in the paving direction, with a hopper (8 ) for receiving material to be paved and, at the rear with a floating screed (4), a longitudinal conveyor device (7 ) being provided between the hopper and a distributor auger (6 ) located in front of the screed in the paving direction, the HOpper ( 8 ) being open towards the longitudinal conveyors and including two hopper halves ( 9 ) which are each pivotable
Abstract: A paver and a corresponding loader each have a chassis ( 1 ) which is provided, at the front in the paving direction, with a hopper ( 8 ) for receiving material to be paved and, at the rear, with a floating screed ( 4 ), a longitudinal conveyor device ( 7 ) being provided between the hopper ( 8 ) and a distributor auger ( 6 ) located in front of the screed ( 4 ) in the paving direction, the hopper ( 8 ) being open towards the longitudinal conveyor device ( 7 ) and including two hopper halves ( 9 ) which are each pivotable about an axis ( 21 ) extending adjacently to the longitudinal conveyor device ( 7 ) in the paving direction. Further, in each of the hopper halves ( 9 ) is provided a lateral conveyor device ( 12 ) which is drivable by a drive ( 13 ), is arranged on the bottom side and extends as far as the longitudinal conveyor device ( 7 ), those bottom portions ( 14, 19 ) of the hopper halves ( 9 ) which remain with regard to the respective lateral conveyor device ( 12 ) being tiltable relative to the lateral conveyor device ( 12 ).

30 citations


Patent
23 Jul 1999
TL;DR: In this article, a vibratory dispersal system includes a multiple component clamp that secures the blade to the vibratory assembly to transfer vibrations from the eccentric weight across the blade.
Abstract: The screed includes an elongated blade vibrated by a centrally located, eccentric weight. The blade is supported by an elongated shaft extending to a power source that drives the weight. An associated operator handle facilitates convenient manipulation of the screed. A unique vibration dispersion system enables the centrally located weight to effectively vibrate the entire blade length. The dispersion system includes an elongated, rigid integral brace extending the entire blade length. The brace secures to the eccentric weight via a vibratory housing. Vibrations from the housing force the blade to vibrate violently to consolidate the plastic concrete. As the screed is drawn across wet plastic concrete, it simultaneously consolidates the concrete by vibrating it thoroughly throughout the monolith while also striking off and levelling the top layer of the concrete. The screed includes a pivoting kickstand that enables the operator to quickly release the screed without significant departure from the present screed angle and without requiring engine shut-off. During use, the operator may deploy the kickstand and then simply drop the screed handles to engage the kickstand and thereby support the screed on both the kickstand and the blade. The entire handle assembly is preferably adjustable to accommodate operators of varying heights as well as various depths of concrete. The vibratory dispersal system includes a multiple component clamp that secures the blade to the vibratory assembly to transfer vibrations from the eccentric weight across the blade. Central portions of the brace are captivated by respective clamp sections.

30 citations


Patent
30 Aug 1999
TL;DR: In this article, a rotatable auger and vibratory screed are used for spreading, grading, consolidating and smoothing loose or plastic material such as poured, uncured concrete.
Abstract: A screeding assembly and method is disclosed for spreading, grading, consolidating and smoothing loose or plastic material such as poured, uncured concrete when the assembly moved over an area of the material. The assembly includes a rotatable auger to move the material laterally across the path of travel, a vibratory screed positioned behind the auger to smooth and finish the material, and an elongated engaging member reciprocated laterally across the path at a position between the auger and vibratory screed to facilitate consolidation of the material. Preferably, a plow/striker is positioned in front of the auger to and remove excess material. The assembly may be mounted on a self-propelled vehicle or other support on a boom for moving the assembly over the material, and is preferably controlled by a laser beam responsive elevation control. A kit for attaching the reciprocating engaging member to an existing screed assembly is also provided.

27 citations


Patent
26 Feb 1999
TL;DR: A vibrating screed with rollers for concrete pour is described in this paper, where the screed comprises an elongate screed member defining opposed first and second ends and extensible between a pair of screed rails.
Abstract: A vibrating screed with rollers for use in leveling a concrete pour. The screed comprises an elongate screed member defining opposed first and second ends and extensible between a pair of screed rails. A first and second roller are rotatably mounted to the screed member and protrude from respective ones of the first and second ends thereof. The rollers are rotatably movable along respective ones of the first and second screed rails. The screed additionally may comprise a motor to rotate the rollers and/or vibrate the screed member.

24 citations


Patent
11 Aug 1999
TL;DR: A paver has a chassis and a trailing floating screed which is articulated on the chassis by a pair of tension arms as mentioned in this paper, and the setting angle of the screed relative to the ground is capable of being adjusted via actuating cylinders.
Abstract: A paver has a chassis and a trailing floating screed which is articulated on the chassis by a pair of tension arms The setting angle of the screed relative to the ground is capable of being adjusted via actuating cylinders The screed includes at least one tamper bar that is movable in upward and downward directions by a drive and having a variable number of strokes Further, the screed has a bottom-side smoothing plate At least one sensor configured for measuring the setting angle is provided in the vicinity of the rear end of the screed The sensor is connected to an associated controller which is capable of adjusting the number of strokes or stroke rate of the tamper bar in order to adjust the setting angle of the screed to a predetermined desired value

23 citations


Patent
08 Oct 1999
TL;DR: In this article, an edge-forming device is used with a screed assembly having lateral ends and a plate extending between the lateral ends, the screed plate having a generally horizontal working surface and generally horizontal centerline.
Abstract: An edge-forming device is used with a screed assembly having lateral ends and a screed plate extending between the lateral ends, the screed plate having a generally horizontal working surface, and a generally horizontal centerline. The edge-forming device includes a frame connected with a lateral end of the screed assembly and a plate disposed below the frame. The plate has a horizontal working surface and extends outwardly beyond the screed assembly lateral end. An adjustment mechanism is connected with the frame and with the edge-forming plate and displaces the plate with respect to the frame to adjust a vertical position of the edge-forming plate with respect to the screed plate such that the plate forms a vertical step in a mat of material paved by the screed assembly proximal to an edge of the mat. The adjustment mechanism also pivots the plate to adjust the taper angle of the vertical step in the mat and also to adjust the angle of attack of the plate. The adjustment mechanism includes a bracket attached to the frame and a pair of movable supports connected with the bracket and displaceable vertically with respect to the frame. Four connective members, preferably turnbuckles, each have a first end connected with one of the supports and a second end connected with the edge-forming plate. The second ends are displaceable vertically with respect to the supports to displace to the attached portions of the plate.

20 citations


Patent
29 Jul 1999
TL;DR: A strike-off device is a paving screed having a main screed and a screed extension attached to it as mentioned in this paper, where the plate has a generally horizontal working edge extending laterally along the front vertical surface of the screed.
Abstract: A strike-off device is for a paving screed having a main screed and a screed extension attached to the main screed, the screed extension having a generally vertical front surface. The strike-off device includes a plate disposed frontwardly of and adjacent to the screed extension. The plate has a generally horizontal working edge extending laterally along the front vertical surface of the screed extension. Two connective members extend between the strike-off plate and the screed extension and are configured to adjustably attach the plate to the screed extension, such that vertical displacement of the connective members adjusts a vertical position of the strike-off working edge. Preferably, the connective members are each a threaded rod having a first end engaged with the strike-off plate and a second end engaged with the screed extension, such that rotation of the rods displace the strike-off plate in vertical directions.

16 citations


Patent
04 Feb 1999
TL;DR: In this article, a paver machine for applying paving material to narrow paths is described, which includes a storage hopper and frame elevated above a roadbed by at least three wheeled unit members.
Abstract: A paver machine for applying paving material to narrow paths is disclosed. The machine includes a storage hopper and frame elevated above a roadbed by at least three wheeled unit members. A free-floating screed assembly located beneath the hopper and pivotally attached to the frame applies a paving material matte to the roadbed as the paver machine is moved along by a front end loader or the like.

14 citations


Patent
05 Oct 1999
TL;DR: In this paper, a strike-off assembly consisting of a flexible screed having a first and second surface secured in a screed track is used to regulate the amount of paving material distributed onto the road surface.
Abstract: A paving system having a strike-off assembly and method of manufacture is provided that distributes paving material onto a road surface. The strike-off assembly comprises a screed assembly comprised in a guide frame. The screed assembly comprises a flexible screed having a first and second surface secured in a screed track. The screed assembly may be disposed behind a mobile paving system to regulate the amount of paving material distributed onto the road surface and to ensure a generally even distribution of paving material across the road surface. After the surface of the flexible screed has become worn or damaged from use, the screed assembly may be removed and reversed such that the second surface is employed to regulate and distribute paving material onto the road surface.

11 citations


Patent
16 Apr 1999
TL;DR: A material flow modifying device for a screed assembly of a paving machine is described in this article, where the main screed is connected with a deflector member and a flow surface is configured to displace the material toward the central axis when the paving machine moves in the intended travel direction.
Abstract: A material flow modifying device is for a screed assembly of a paving machine. The screed assembly has a main screed with a central axis extending in a direction of intended travel of the paving machine and two screed extensions movably mounted to the main screed. The flow modifying device includes a deflector member connected with the screed extension and having a flow surface facing toward the central axis of the main screed. The flow surface is contactable with paving material on a base surface and is configured to displace the material toward the central axis when the paving machine moves in the intended travel direction. The deflector member has a first end disposed adjacent to the inner vertical surface of the screed extension and a second, free end disposed proximal to the front vertical surface of the main screed, such that the second end moves laterally along the main screed during movement of the screed extension. The distance between the member second end and the central axis is greater than the distance between the member first end and the central axis, such that the flow surface is angled inwardly and rearwardly toward the main screed central axis. Preferably, the deflector member includes a main body portion attached to the screed extension and a wear plate removably attached to the main body portion. Alternatively, the deflector member is formed as a main body portion only or even as an integral portion of the screed extension.

Patent
09 Aug 1999
TL;DR: In this article, an improved version of the rock screed bucket has been presented with a solid rectangular back plate together with a framework having a rectangular bottom and a pair of generally triangular shaped sides.
Abstract: The present new, improved rock screed bucket has a solid rectangular back plate together with a framework having a rectangular bottom and a pair of generally triangular shaped sides. The solid rectangular back plate acts as a backstop. The rectangular bottom supports a heavy duty grading screen. A mounting frame is mounted to the rear of the solid rectangular back plate through a plurality of shock absorbing spacers. The conventional arm structures and conventional hydraulic system of a conventional tractor or skid loader connect to the mounting frame. By rapidly moving the conventional arm structure and conventional hydraulic system any material in the rock screed bucket can be shaken and thus screened. In a second embodiment, a hydraulic shaker may be attached to the top of the rock screed bucket to shake the rock screed bucket. The hydraulic shaker is conventional and derives its power from the conventional hydraulic system of the tractor or skid loader.

Patent
03 May 1999
TL;DR: In this paper, a rotary rotary screed is used to remove excess concrete from a poured pad, or other horizontal concrete surface, and handles are coupled to plates at each end of the screed during operation.
Abstract: A powered rotary screed provides a powered strike tube that rotates to provide a finish to wet concrete during screeding and a drive tube that provides motive power to the screed to assist with the difficult task of removing excess concrete from a poured pad, or other horizontal concrete surface. No framework or other supporting structure extends between ends of the screed thereby making the screed more portable than comparable screeds having a structure that supports the roller tubes and extends the length of the screed. Handles are pivotally coupled to plates at each end of the screed to maneuver and control the screed during operation. Because the handles are pivotally mounted, they can be pivoted outward to permit the screed to maneuver close to obstacles located near the pad. Additionally, the combination of the handles, strike tube, and drive tube permit the handles to be used as levers to control the effective motive power of the drive tube, thereby providing substantial control to the screed operators.

Patent
31 Mar 1999
TL;DR: In this article, a rotatable auger and vibratory screed are used for spreading, grading, consolidating and smoothing loose or plastic material such as poured, uncured concrete.
Abstract: A screeding assembly and method is disclosed for spreading, grading, consolidating and smoothing loose or plastic material such as poured, uncured concrete when the assembly moved over an area of the material. The assembly includes a rotatable auger to move the material laterally across the path of travel, a vibratory screed positioned behind the auger to smooth and finish the material, and an elongated engaging member reciprocated laterally across the path at a position between the auger and vibratory screed to facilitate consolidation of the material. Preferably, a plow/striker is positioned in front of the auger to and remove excess material. The assembly may be mounted on a self-propelled vehicle or other support on a boom for moving the assembly over the material, and is preferably controlled by a laser beam responsive elevation control. A kit for attaching the reciprocating engaging member to an existing screed assembly is also provided.

Patent
30 Jul 1999
TL;DR: In this article, the main screed assembly for use in paving material upon a generally horizontal surface includes a main-screed having a generally vertical front surface, and a pair of horizontally-extending support members each having a first end movably connected with the screed and a second end connected with a screed extension.
Abstract: A screed assembly for use in paving material upon a generally horizontal surface includes a main screed having a generally vertical front surface. At least one and preferably two screed extensions are connected with the main screed. At least one and preferably a pair horizontally-extending support members each have a first end movably connected with the main screed and a second end connected with a screed extension. The support members are movable with respect to the main screed so as to displace the screed extensions alternately toward and away from the main screed front surface so as to adjust the angle of attack of the screed extensions independently of the angle of attack of the main screed. Preferably, an adjustment assembly or device is connected with the support member and is configured to displace the support member with respect to the main screed. The adjustment device includes a base attached to either the main screed or the support member, preferably the support member. A horizontally-extending rod has a first end attached to the other of the main screed or the support member and a second end movably engaged with the base. Movement of the rod with respect to the base displaces the screed extension alternatively toward and away from the front surface of the main screed so as to adjust the angle of attack of the screed extension.

Patent
11 May 1999
TL;DR: In this paper, the problem of executing a flat pavement having no variation in thickness of the pavement even in the case there are variations in a paving road width so as to serve every screed for the pavement, even if it is the pavement of the minimum road width when the pavement is executed with a screed device constituted by arranging two stages of auxiliary screeds to the rear side of a main screed.
Abstract: PROBLEM TO BE SOLVED: To efficiently execute a flat pavement having no variation in thickness of the pavement even in the case there are variations in a paving road width so as to serve every screed for the pavement even if it is the pavement of the minimum road width when the pavement is executed with a screed device constituted by arranging two stages of auxiliary screeds to the rear side of a main screed. SOLUTION: Width of a main screed 1 is smaller than the width of a paving machine, a pair of first right and left auxiliary screeds 2 and 2 are arranged to the rear side of the main screed 1 in the direction of a paving road width in an expansible manner and, at the same time, a pair of second right and left auxiliary screeds are arranged to the rear sides of the first right and left screeds 2 and 2 in the direction of the paving road width in an expansible manner in the same way. Then, in such a state as the first and second auxiliary screeds 2 and 3 are contracted to the maximum, the outside ends of the first and second auxiliary screeds 2 and 3 are so constituted that they are projected to planar stair-shape from the outside ends of the main screed 1, and pavement with specific thickness is executed with every screed even when the pavement of the minimum road width is executed.

Patent
23 Jul 1999
TL;DR: A paver screed has a main screed with two outer side walls, at least one of the side walls being provided with insertion orifices for the releasable mounting of a lateral screed extension by means of fastening elements capable of being inserted through the insertionorifices as discussed by the authors.
Abstract: A paver screed has a main screed with two outer side walls, at least one of the side walls being provided with insertion orifices for the releasable mounting of at least one lateral screed extension by means of fastening elements capable of being inserted through the insertion orifices. A screed extension has fastening elements that comprise hydraulic cylinders which each have a piston that is spring-biased into an initial, retracted position. The cylinders are actuated by hydraulic fluid to displace or extend the piston against the biasing action of the spring. Preferably, the hydraulic cylinders are connected a hydraulic circuit of the main screed. The piston of each hydraulic cylinder carries a shank capable of being inserted through a proximal insertion orifice and which are preferably provided with an abutment element configured for attaching the cylinder to the sidewall of the main screed.

Patent
12 May 1999
TL;DR: In this article, a paver with a chassis at the front in the paving direction, with a hopper ( 11 ) for receiving material to be paved and, at the rear, with two centrally arranged longitudinal conveyor devices ( 9,10 ) guided through a shaft, being provided between the hopper and a distributor auger ( 7 ) located in front of the screed ( 5 ), in a paving direction.
Abstract: A paver ( 1 ) with a chassis ( 2 ) at the front in the paving direction, with a hopper ( 11 ) for receiving material to be paved and, at the rear, with a floating screed ( 5 ), two centrally arranged longitudinal conveyor devices ( 9,10 ) guided through a shaft ( 8 ) being provided between the hopper ( 11 ) and a distributor auger ( 7 ) located in front of the screed ( 5 ) in the paving direction, the hopper ( 11 ) being open relative to the longitudinal conveyor devices ( 9,10 ) and an additional conveyor device ( 33 ) for loading a hopper ( 12 ) of a following paver ( 13 ) being provided. One of the longitudinal conveyor devices ( 10 ) extends from the rear outlet of the shaft ( 8 ), beyond the screed ( 5 ) and to the additional conveyor device ( 33 ) and has a discharge end ( 14 ) which is fixed or adjustable to an appropriate height for loading the hopper ( 12 ). The longitudinal conveyor devices ( 9,10 ) are partitioned off from each other by a vertical separating plate ( 20 ).

Patent
13 Jan 1999
TL;DR: In this article, a technique for continuous production and laying of cold or emulsion macadam on a road or other hard surface involves the use of mobile apparatus containing a mixing chamber, in which the macadsam is made up from its raw materials.
Abstract: of EP0691433A technique for the continuous production and laying of cold or emulsion macadam on a road or other hard surface involves the use of mobile apparatus containing a mixing chamber (6) in which the macadam is made up from its raw materials. The mobile apparatus includes means (7) for depositing a primer layer of binder on the surface to be covered, before feeding the macadam onto the surface. The macadam is then distributed laterally and pressed and formed by an adjustable screed (9) to make a surface of the chosen depth.

Patent
05 Oct 1999
TL;DR: In this paper, the authors presented a laying-leveling device for paving material having an automatic controller for the height of the outrigger device, an attack-angle adjusting device for holding a specified proper angle in the lower-layer road surface progressive direction to the whole screed device, and a controller controlling each screed blade device and the compactor.
Abstract: PROBLEM TO BE SOLVED: To provide a laying-leveling device continuously laying and forming a special waveform road surface SOLUTION: The laying-leveling device for the paving material has a travelling car 1, to which a hopper device 3, a delivery device and a laying-spreading device 4 are installed, and a screed device 2 constituted while containing an outrigger device 5 holding the screed device 2 in specified height, a plurality of screed blade devices 6, a compactor 7 and a main frame 8 for holding these each device The laying-leveling device for the paving material is configured while having an automatic controller for the height of the outrigger device 5, an attack-angle adjusting device for holding a specified proper angle in the lower-layer road-surface progressive direction to the whole screed device 2 and a controller controlling each screed blade device 2 and the compactor 7

Patent
25 May 1999
TL;DR: In this paper, the authors used a canopy roof 6 of a main driver's seat as a screed step 20 roof, when a rod 70 of a hydraulic cylinder 7 is shrunk, a movable part 51 of a roof support 5 and an auxiliary support 9 fall in cooperation by means of a link mechanism.
Abstract: PROBLEM TO BE SOLVED: To effectively use a canopy roof by constituting a roof support so as to rise and fall freely, and supporting a canopy roof so that it can be fixed at a position where it functions as a screed as a screed step roof. SOLUTION: In using a canopy roof 6 of a main driver's seat 3 as a screed step 20 roof, when a rod 70 of a hydraulic cylinder 7 is shrunk, a movable part 51 of a roof support 5 and an auxiliary support 9 fall in cooperation by means of a link mechanism where axial connection lines of pins 53, 54, 55, 56 form a parallelogram. The roof 6 moves parallely to a position above a position of a step 20 control handle 21, which is raised owing to vibration, to thereby covers all equipment disposed in the step 20 and the screed part 2. At the time of returning the roof to the original position, the rod 70 is elongated to erect the movable part 51 and the auxiliary support 9. Accordingly the canopy roof 6 can also be used as the screed step 20 roof.

Patent
26 Jan 1999
TL;DR: In this paper, a multistage telescopic cylinder was used to expand the paving width by making an auxiliary screed accommodated within the car width of an asphalt finisher movable through an operation to stretch plural sets of auxiliary screeds.
Abstract: PROBLEM TO BE SOLVED: To enlarge the maximum paving width by making an auxiliary screed accommodated within the car width of an asphalt finisher movable through a simple operation to stretch plural sets of auxiliary screeds. SOLUTION: Two sets of auxiliary screeds 15, 16 are laterally movably attached to a main screed 14. The first cylinder 21 of a multistage telescopic cylinder 20 is fixed inside a main screed 14. The top part 22a of the second cylinder 22 of the multistage telescopic cylinder 20 is attached to the side part 15a of the first auxiliary screed 15, and the tip part 23a of the rod 23 of the second cylinder is attached to the side part 16a of the second auxiliary screed 16. When the multistage telescopic cylinder 20 is driven in the direction of stretching, the second cylinder 22 protrudes from the first cylinder 21 and the auxiliary screed 15 moves outward, and the rod 23 protrudes from the second cylinder 22 and the second auxiliary screed 16 moves outward. Thus the first and the second auxiliary screed 15, 16 move laterally outward to the main screed 14 to expand a paving width.

Patent
03 Aug 1999
TL;DR: In this article, an inexpensive controller consisting of a combination of circular cams, microswitches and a relay in a finisher is used to adjust an angle of a screed.
Abstract: PROBLEM TO BE SOLVED: To control a paving thickness by automatically adjusting an angle of a screed by providing an inexpensive controller mainly composed of a combination of circular cams, microswitches and a relay in a finisher. SOLUTION: A controller box 9 enclosing a controller 3 is installed on an arm of a screed 2 of a finisher main body 1. Two circular cams 6 are installed in the inverse direction on a rotary shaft 5 of the controller 3 so that microswitches 7 by placing sensors on the circular cams 6 are arranged in the respective ones. Sensitivity can be adjusted by a sensitivity lug 8 by laterally moving one side microswitch 7 in the perpendicular direction to the rotary shaft 5. The rise and fall is transmitted to the rotary shaft 5 by detecting a height of a road surface by installing a detecting ski 4 on the rotary shaft 5. A paving thickness is automatically controlled by changing an angle of a screed 2 by a level cylinder by actuating a solenoid valve through a relay by turning on either microswitch 7 by rotation of the rotary shaft 5.

Patent
21 Dec 1999
TL;DR: In this paper, a paving width up to twice as much as a main screed in a screed device attached to a road paving vehicle such as an asphalt finisher was steplessly changed.
Abstract: PROBLEM TO BE SOLVED: To steplessly change a paving width up to above twice as much as a main screed in a screed device attached to a road paving vehicle such as an asphalt finisher. SOLUTION: A first telescopic screed 24 and a second telescopic screed 25 about the same in width as a main screed 23 are provided side by side in the rear in the advancing direction of the main screed 23, and support arms 26, 26 and 21, 27 are protrusively provided backward on both the upper outsides of the main screed 23 to support the first and the second telescopic screed 24, 25 so as to be laterally movable on each road surface. The first and the second cylinder 28, 29 are set mutually opposite in the upper part of the main screed 23, and each of their cylinder rods 28a, 29a is protruded through the holes of the support arms 26, 27 toward the outsides of the road surface width, and severally fixed to the upper left end face 30 of the first telescopic screed 24 and the upper right end face 31 of the second telescopic screed 25.

Patent
07 Apr 1999
TL;DR: In this paper, a fully-automatic chemical-fertilizer deep applying machine used in a paddy field is described, where a liquid fertilizer applying part is composed of a liquid reservoir, a pressure bottle, a walking pressurizing mechanism, a liquid conveying pipe, a fertilizer jetting gun, and a screed board.
Abstract: The utility model discloses a fully-automatic chemical-fertilizer deep applying machine used in a paddy field In the utility model, a liquid fertilizer applying part is composed of a liquid reservoir, a pressure bottle, a walking pressurizing mechanism, a liquid conveying pipe, a fertilizer jetting gun, and a screed board A solid fertilizer applying part is composed of a walking drive mechanism, a fertilizer box, a diverter, a fertilizer jetting gun, and a screed board The utility model mainly utilizes the principles of walking pressurization and push to carry out fertilizing continuously and uniformly The utility model not only can fertilize the liquid fertilizer, but also can fertilize the solid fertilizer; not only can replace a farm implement to work alone, but also can cause the land adjustment and the fertilization to be carried out simultaneously More especially, the utility model is improved to apply the last process, namely, an optimum stage for fertilizing after the land is adjusted and before the seedling is transplanted, which improves the utilizing effect of the fertilizer The utility model has the advantages of complementary all sidedness, multiple functions, wide range of application, simple structure, light weight, and easy popularization

Patent
29 Jun 1999
TL;DR: In this article, a one part urethane primer is applied on unscreened asphalt concrete as a subbase and a pavement structure 3 having voids constituted of rubber chips, natural gravels, and a 1 part Urethane binder is formed thereon.
Abstract: PROBLEM TO BE SOLVED: To securely and rapidly form a filling material layer without scattering mists by spreading a quick-curing resin on the upper face of a pavement structure in which aggregate are bound with each other with a specified binder so as to have voids, by a screed and forming the filling material layer for joints. SOLUTION: A one part urethane primer is applied on unscreened asphalt concrete as a subbase 1 and a pavement structure 3 having voids constituted of rubber chips, natural gravels, and a one part urethane binder is formed thereon. After curing of the structure 3, a quick-curing two part urethane resin made of a modified urethane prepolymer and a polyether polyol amine mixture is poured on the upper face of the pavement structure 3 by means of a low pressure delivery type mixing and agitating machine to form a filling material layer 5 by applying it so as to rub it thereon by a metallic trowel. After curing of the filling material layer 5, a two part urethane resin is applied thereon and a pavement body 6 is formed while keeping the flatness by self-leveling. And further, a surface course 7 is formed on the pavement body 6.

Patent
18 Jun 1999
TL;DR: In this article, a screed for a payer with a baseplate coupled to a vibrating drive and in front of which, as seen in the laying direction, is arranged at least one tamper bar (4) which extends transversely to the walking direction and is movable up and down by means of a drive, and which is capable of being electrically heated.
Abstract: The invention relates to a screed for a payer, with a baseplate (1) which, if appropriate, is coupled to a vibrating drive and in front of which, as seen in the laying direction, is arranged at least one tamper bar (4) which extends transversely to the laying direction and is movable up and down by means of a drive (5) and which is capable of being electrically heated. At the same time, at least one coil (10) is provided, which is arranged so as to be adjacent to the tamper bar (4) and to which a high-frequency current can be applied via a current source (11), the said current inducing eddy currents in the tamper bar (4).

Patent
17 Mar 1999
TL;DR: The separating element has a gap rail which can be fixed to two building elements which are spaced from one another as mentioned in this paper, and a reinforcing element (6,6') is arranged on at least one side wall (4,5) of an insulating strip (3) on the gap rail.
Abstract: of EP0874106The separating element has a gap rail which can be fixed to two building elements which are spaced from one another. A reinforcing element (6,6') is arranged on at least one side wall (4,5) of an insulating strip (3) on the rail. Each side wall of the strip is connected to a flat bar (7,7'), and the reinforcing element has at least two elongated holes (12) which are spaced from one another, and which allow adjustment of its level and-or slope. Fixing elements (8,8') extend through the holes in order to connect with the flat bars.

Patent
30 Jul 1999
TL;DR: A retainer device is used with a screed assembly including a main screed and a pair of front-mounted screed extensions connected with the main-screed.
Abstract: A retainer device is used with a screed assembly including a main screed and a pair of front-mounted screed extensions connected with the main screed. Each extension is pivotally attached to the main screed and has a front surface facing generally away from the main screed. The retainer device includes a retainer plate disposed adjacent to the front surface of the screed extension. A horizontally-extending rod has a first end connected with the retainer plate and a second end connected with the main screed. The rod is configured to displace the retainer plate between a first, most distal position with respect to the main screed and a second, most proximal position with respect to the main screed. At the most proximal position, the retainer member acts upon the screed extension such that the screed extension is retained generally in contact with the main screed. Further, the plate prevents rotation of the screed extension in a direction generally away from the main screed.