초록 ▼

A portable vibratory wet concrete screed includes a blade, an exciter that is selectively driven to induce vibrations in the blade, at least one operator-manipulated handle connected to the blade and extending upwardly and rearwardly, a laser receiver mounted on the screed at a height above an upper

A portable vibratory wet concrete screed includes a blade, an exciter that is selectively driven to induce vibrations in the blade, at least one operator-manipulated handle connected to the blade and extending upwardly and rearwardly, a laser receiver mounted on the screed at a height above an upper end of the handle, and an indicator that is operatively connected to the receiver. The indicator provides a visual indication of the screed height relative to a desired grade. It is located remote from the receiver at a location which, when viewed from the perspective of a person in the vicinity of a screed operator, is at least substantially in a focal area containing the rear edge of the blade. The handle is mounted on the blade so as to be foldable from an upright, operative position in which it extends vertically and horizontally well beyond horizontal and vertical footprints occupied by a combination of the blade and the exciter to a stowed position in which it is positioned at least substantially entirely within the horizontal and vertical footprints.

대표청구항 ▼

1. A portable vibratory wet concrete screed comprising: a blade for leveling wet concrete, the blade having a front edge and a rear edge; an exciter that is selectively driven to induce vibrations in the blade;at least one operator-manipulated handle that is connected to the blade and that extends u

1. A portable vibratory wet concrete screed comprising: a blade for leveling wet concrete, the blade having a front edge and a rear edge; an exciter that is selectively driven to induce vibrations in the blade;at least one operator-manipulated handle that is connected to the blade and that extends upwardly and rearwardly from the blade;a laser receiver that is mounted on the screed at a height above an upper end of the handle; andan indicator that is operatively connected to the receiver and that provides a visual indication of the screed height relative to a desired grade, wherein the indicator is located remote from the receiver at a location which, when viewed from the perspective of a person standing in the vicinity of a screed operator, is at least substantially in a focus area so as to be capable of concurrently viewing the indicator and at least a portion of the rear edge of the blade;wherein the handle and the receiver are mounted on the blade via an adjustable mount assembly, the mount assembly including a base that is supported on the blade and a pedestal that is mounted on the base so as to rotate about a vertical axiswherein the handle and the receiver are foldable from an upright, operative position in which they extend well beyond at least one of a horizontal footprint and a vertical footprint occupied by the combination of the blade and the exciter, to a stowed position in which the handle and the receiver are positioned at least substantially entirely within said footprints. 2. The screed as recited in claim 1, wherein the indicator is located within 18″ of the rear edge of the blade. 3. The screed as recited in claim 2, wherein the indicator is located within 14″ of the rear edge of the blade. 4. The screed of claim 2, wherein the indicator is mounted on the handle beneath a handgrip thereof and is inclined upwardly and forwardly relative to the handle. 5. The screed of claim 1, wherein the indicator includes a display that visually indicates a change of magnitude at which the screed is off-grade without changing an operating frequency of the indicator. 6. The screed of claim 5, wherein the display includes a plurality of lights that are illuminated in combinations that vary with the magnitude at which the screed is off-grade. 7. The screed of claim 1, wherein the handle and the receiver are each supported on the pedestal of the mount assembly so as to pivot about a horizontal axis. 8. The screed of claim 7, wherein the receiver is mounted on a mast that is pivotally mounted on a first side of the mounting portion of the mount assembly and the handle is pivotally mounted on a second side of the mount assembly. 9. The screed of claim 1, wherein the handle, the receiver, and the indicator are located in the vicinity of a first end of the blade, and further comprising a second handle, a second receiver, and a second indicator all mounted on the blade in the vicinity of a second end thereof. 10. A portable vibratory wet concrete screed comprising: a blade for leveling wet concrete, the blade having a front edge and a rear edge; an exciter that is selectively driven to induce vibrations in the blade;first and second operator-manipulated handles that are connected to the blade and that extends upwardly and rearwardly from the blade, each handle including a first end that is mounted on the blade, a second, free end, and a hand grip located between the first and second ends;first and second mast mounted-receivers, each of which is mounted on the blade in the vicinity of a respective handle and which is located at a height above the second end of the respective handle; andfirst and second indicators, each of which is operatively connected to an associated receiver and which provides a visual indication of the screed height relative to a desired grade, wherein each indicator is mounted on the screed within 18″ of the rear edge of the blade so as to permit a respective standing operator manipulating the associated handle to simultaneously view both the indicator and the rear edge of the blade;wherein the exciter and blade are contained within a rectangular horizontal footprint bordered by outer edges of the exciter and the blade, and further comprising first and second adjustable mount assemblies, each of which supports a respective one of the handles and a respective one of the masts on the blade, each mount assembly being adjustable between a first, operative position in which at least one of the respective handle and the respective receiver are located at least in part outside of the footprint and a second, stowed position in which the respective handle and the respective receiver are located at least substantially entirely within the footprint. 11. The screed of claim 10, wherein the indicator includes a display that includes a plurality of lights that are illuminated in combinations that vary with the magnitude at which the screed is off-grade. 12. A portable vibratory wet screed comprising: a blade for leveling wet concrete, the blade having a front edge and a rear edge; an exciter that is selectively driven to induce vibrations in the blade; andan operator-manipulated handle that is connected to the blade and that extends upwardly and rearwardly from the blade;a mast that supports a laser receiver and that is mounted on the screed;a mount assembly via which the handle and the mast are mounted on the blade, whereinthe mount assembly includes a base and a pedestal that is mounted on the base so as to rotate about a vertical axis, and whereinthe handle and the mast are each mounted on the pedestal so as to be pivotal about a horizontal axis;wherein the handle and the mast are foldable, without removal from the blade, from an upright, operative position in which the handle extends vertically and horizontally well beyond horizontal and vertical footprints occupied by a combination of the blade and the exciter and the mast extends well above the vertical footprint of the blade and the exciter to a stowed position in which the handle and the mast are positioned at least substantially entirely within said horizontal and vertical footprints. 13. The screed of claim 12, further comprising an indicator that is operatively connected to the receiver and that provides a visual indication of screed height relative to a desired grade, wherein the indicator is located remote from the receiver at a location which, when viewed from the perspective of a person in the vicinity of a screed operator, is at least substantially in a focal area containing the rear edge of the blade. 14. The screed of claim 13, wherein the indicator includes a display that includes a plurality of lights that are illuminated in combinations that vary with the magnitude at which the screed is off-grade. 15. A method of operating a wet concrete screed having a blade and an operator's handle connected to the blade, the method comprising: transmitting a laser beam from a transmitter located outside of a pour area to a receiver, the receiver being mounted on a mast which is supported on the blade, the mast and the handle being mounted on the blade via an adjustable mount, the adjustable mount including a base that is supported on the blade and a pedestal on which the mast and the handle are mounted, wherein the pedestal is mounted on the base so as to rotate about a vertical axis;transmitting a signal from the receiver to an indicator supported on the screed remote from the receiver, wherein the indicator is positioned within 18 inches from a rear edge of the blade and an operator's eyes are offset upward and rearward from the indicator by a distance associated with an operator's arms and the handle;in response to the transmitting step, displaying, on the indicator, a visual indication of the position of the screed relative to a desired grade;manually manipulating the handle, using an operator's hands, while simultaneously viewing both the indicator and a rear edge of the blade;and pivoting the handle and the receiver relative to the blade to fold the handle and the receiver from an upright, operative position in which the handle and the receiver extend well beyond at least one of a horizontal footprint and a vertical footprint occupied by the combination of the blade and the exciter, to a stowed position in which the handle and the receiver are positioned at least substantially entirely within said footprints. 16. The method of claim 15, wherein the displaying step comprises illuminating a plurality of lights in combinations that vary with the magnitude at which the screed is off-grade. 17. A portable vibratory wet concrete screed comprising: a blade for leveling wet concrete, the blade having a front edge and a rear edge; an exciter that is selectively driven to induce vibrations in the blade;at least one operator-manipulated handle that is connected to the blade and that extends upwardly and rearwardly from the blade;a laser receiver that is mounted on the screed at a height above an upper end of the handle; andan indicator that is operatively connected to the receiver and that provides a visual indication of the screed height relative to a desired grade, wherein the indicator includes a display that visually indicates a change of magnitude at which the screed is off-grade without changing a frequency of indicator flashing; andwherein the indicator is located remote from the receiver at a location which, when viewed from the perspective of a person in the vicinity of a screed operator, is at least substantially at a focal distance and a sight direction that defines a focal area containing the rear edge of the blade such that an operator can simultaneously view both the indicator and the rear edge of the blade while standing and manipulating the handle;wherein the handle and the receiver are mounted on the blade via an adjustable mount assembly, the mount assembly including a base that is supported on the blade and a pedestal that is mounted on the base so as to rotate about a vertical axiswherein the handle and the receiver are foldable from an upright, operative position in which they extend well beyond at least one of a horizontal footprint and a vertical footprint occupied by the combination of the blade and the exciter, to a stowed position in which the handle and the receiver are positioned at least substantially entirely within said footprints. 18. The screed of claim 17, wherein the display includes a plurality of lights that are illuminated in combinations that vary with the magnitude at which the screed is off-grade. 19. A portable vibratory wet concrete screed comprising: a blade for leveling wet concrete, the blade having a front edge and a rear edge; an exciter that is selectively driven to induce vibrations in the blade;at least one operator-manipulated handle that is connected to the blade and that extends upwardly and rearwardly from the blade;a laser receiver that is mounted on the screed at a height above an upper end of the handle;an indicator that is operatively connected to the receiver and that provides a visual indication of the screed height relative to a desired grade, wherein the indicator is located remote from the receiver at a location which, when viewed from the perspective of a person in the vicinity of a screed operator, is at least substantially in a focal area containing the rear edge of the blade;wherein the handle and the receiver are mounted on the blade so as to be foldable from an upright, operative position in which they extend well beyond at least one of a horizontal footprint and a vertical footprint occupied by the combination of the blade and the exciter, and to a stowed position in which the handle and the receiver are positioned at least substantially entirely within said footprints;an adjustable mount assembly via which the handle and the receiver are mounted on the blade, the mount assembly including a base that is supported on the blade and a pedestal that is mounted on the base so as to rotate about a vertical axis, the handle and the receiver each being supported on the pedestal of the mount assembly so as to pivot about a horizontal axis; andwherein the receiver is mounted on a mast that is pivotally mounted on a first side of the mounting portion of the mount assembly and the handle is pivotally mounted on a second side of the mount assembly.