Plastic article or earthenware shaping or treating: apparatus – With apparatus assembly or dismantling means or with idle part
Reexamination Certificate
1999-02-16
2001-10-02
Mackey, James P. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
With apparatus assembly or dismantling means or with idle part
C425S456000, C425S458000, C016S430000, C404S118000
Reexamination Certificate
active
06296467
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to devices for surfacing concrete and, more particularly, to vibrating screeds for concrete surfacing of the type having an elongated blade mounted transversally at the bottom of a pair of hand held handles with a motor being adapted to transmit to the blade a vibratory movement.
2. Description of the Prior Art
Conventional vibrating screeds comprise, for instance, an elongated blade extending horizontally and transversally at lower ends of a pair of handles adapted to be hand held and operated for displacing the screed over a concrete surface. A motor is provided above the blade and between the handles and has its shaft extending vertically downwards from the motor to the blade and is connected thereat such that, with a counterweight or a cam-like arrangement, it imparts oscillatory movement to the blade of high frequency but low amplitude.
The pair of handles permit an easy and constant correction of the level of the concrete with minimum effort. The blade may have different lengths, for example between 4 and 12 feet. A throttle control of the motor is provided at one of the handles such that the speed of the motor may be monitored and adjusted as the blade is displaced over the concrete being surfaced.
For instance, U.S. Pat. No. 4,861,188 issued to Rouillard on Aug. 29, 1989 discloses a method and an apparatus for compacting and smoothing freshly poured concrete during the construction of a floor or other flat surface. The apparatus is a screed divided in two portions. The first portion is used to level, compact and remove excess concrete and the second portion allows the screed to float on the freshly poured and soft concrete.
U.S. Pat. No. 4,848,961 issued to Rouillard on Jul. 18, 1989 discloses a concrete screeding apparatus and, more particularly, an improved portable and lightweight vibrating concrete screed enabling a workman to use same without the need for rigid forms. The screeding apparatus comprises a generally elongated beam having a horizontal surface and a generally vertical surface. A plurality of vibrators are mounted on the beam. The height of the vertical surface diminishes from the centre to the edges so as to increase the amplitude of vibration and, therefore, improve the manoeuvrability of the screed. In addition, the corners formed by the trailing edge and the side edges of the horizontal surface are rounded so as to avoid the penetration of the side edges into the freshly poured concrete.
SUMMARY OF THE INVENTION
It is therefore an aim of the present invention to provide an improved screed for surfacing concrete.
It is also an aim of the present invention to provide such a concrete surfacing screed having adjustable handles.
Therefore, in accordance with the present invention, there is provided a vibrating device for surfacing concrete, comprising a surfacing blade, handle means mounted to said blade, a motor, vibration causing means and transmission means connecting said motor to said vibration causing means, wherein when said motor is in operation it causes said transmission means to rotate with said transmission mans being adapted to impart a vibratory motion to said blade, said transmission means comprising a flexible joint means having first and second sections having longitudinal axes angled to each other.
Also in accordance with the present invention, there is provided a vibrating device for surfacing concrete, comprising a surfacing blade, handle means mounted to said blade, a motor, vibration causing means and transmission means connecting said motor to said vibration causing means, wherein when said motor is in operation it causes said transmission means to rotate with said transmission means being adapted to impart a vibratory motion to said blade, said handle means comprising a main elongated handle member and a handle mounted at a proximal end thereof, said handle having a first element releasably mounted to said main handle member and being adapted to swivel at least partly around an axis of said main handle member.
Further in accordance with the present invention, there is provided a vibrating device for surfacing concrete, comprising a surfacing blade, handle means mounted to said blade, a motor, vibration causing means and transmission means connecting said motor to said vibration causing means, wherein when said motor is in operation it causes said transmission means to rotate with said transmission mans being adapted to impart a vibratory motion to said blade, said handle means comprising a main elongated handle member and a handle, said handle having a first element mounted to a proximal end of said main handle member, said handle having second and third elements capable of relative rotatable displacement and capable of being secured in a desired relative position thereof with a grip member being mounted to said third element such that said grip member may be swiveled at least partly around an axis of said second element.
REFERENCES:
patent: 1829467 (1931-10-01), Atkinson
patent: 4838730 (1989-06-01), Owens
patent: 4848961 (1989-07-01), Rouillard
patent: 4861188 (1989-08-01), Rouillard
patent: 5375942 (1994-12-01), Lindley et al.
patent: 5803656 (1998-09-01), Turck
Merriam-Webster's Collegiate Dictionary 10th Edition; Merriam-Webster Inc. 1999; p. 1022.
Heckenberg Donald
Les Betons Roger Rouillard Inc.
Mackey James P.
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