Road structure – process – or apparatus – Apparatus – With in situ means for both comminuting and treating – e.g.,...
Reexamination Certificate
1999-04-07
2001-01-30
Lillis, Eileen D. (Department: 3673)
Road structure, process, or apparatus
Apparatus
With in situ means for both comminuting and treating, e.g.,...
C404S090000, C074S103000, C299S001500, C299S017000
Reexamination Certificate
active
06179519
ABSTRACT:
FIELD OF THE INVENTION AND PRIOR ART
This invention relates to a device for moving an object, which object is pivotably arranged in relation to a base portion about an axis. In addition, the invention relates to a method for moving the object.
Preferably, the object is constituted by a member for treating a material layer. This treatment is first of all intended to be a material removing treatment. Although the layer may consist of other material a concrete layer is preferably concerned herein. Primarily, the treatment is intended to have the purpose to remove weakened material from the layer. It may then be a question of removing weakened concrete from concrete layers on roads, bridges and a variety of building structures, where upon the removed concrete may be replaced by new concrete. It is in this connection specially preferred that the treating member is constituted by a jet member so as to direct a high pressure jet of liquid against the material layer. Thus, it is this high pressure jet of liquid which executes the material removing treatment. Preferably, the high pressure liquid consists of water.
The above mentioned prior art is described, for instance, in our European patent 0 544 775. Therein is described how the base portion represents a part of a carriage movable to and fro along a guiding, a nozzle of the jet member being intended to point obliquely in the motion direction of the carriage whereas the jet member, when reaching the outer positions, is turned over in that way that its nozzle, during the carriage motion in opposite direction, still is pointing obliquely in the motion direction of the carriage. During pivoting the jet member in connection to a change of the motion direction of the carriage, the nozzle of the jet member will describe a curved path of motion, along which the nozzle will present a varying distance to the material layer. This varying distance implies irregular treatment of the material layer. Experiments carried out by us show that even a comparatively small increase of the distance between the nozzle and the material layer surface reduces the treatment result considerably.
OBJECT OF THE INVENTION
The object of the present invention is to create conditions for such an efficient function as possible of the inventive device and the method, respectively, by modifying the motion pattern of the object (jet member).
SUMMARY OF THE INVENTION
According to the invention this object is obtained by providing the device with an arrangement for displacing, during pivoting motion of the object, the object substantially parallel to its pivoting plane for the purpose of causing a point at the object to describe a motion in substantially one and the same plane.
Thus, this fundamental invention concept involves that, despite the object is operated in a pivoting motion, a point at the object will describe a motion in substantially one and the same plane, whereby conditions are created for constancy in the relation between the object and some additional member, for example a planar material layer, which member will be treated by means of the object.
Applied to the art described in the introduction for material removing treatment of a material layer this involves in reality that it is the jet member nozzle which during the pivoting motion of the jet member, thanks to the displacing motion, will describe said motion in substantially one and the same plane. Thus, this implies that the distance from the nozzle to a substantially planar material layer may be, in substance, constant during the pivoting motion of the jet member, i.e. when the jet member is pivoted, an essentially constant result of the material removing treatment will arise since the nozzle always is located in a plane substantially parallel to the plane of the material layer.
It is also to be noted in this connection that the art described creates conditions for placing, during the whole process of treatment, the nozzle of the jet member closer to the material layer to be treated than it has been possible according to prior art according to EP 0 544 775, for instance. According to this art, in fact, it was necessary to locate the nozzle of the jet member at a distance so far from the material layer intended to be treated that the nozzle would not be in contact with the material layer (for example concrete reinforcement present there) when the jet member pivots in the outer positions. Thus, it was according to prior art necessary to let the lowest position of the nozzle of the jet member during the pivoting motions be determining for the distance between the nozzle and the material layer during the remaining part of the process of treatment. This involved an unnecessarily great distance between the nozzle and the material layer with worse efficiency resulting therefrom. A resulting effect of the invention is further that a greater inclination of the direction of the nozzle compared to prior art may be applied since the nozzle always will be at a substantially constant distance to the material layer.
Further advantages and advantageous embodiments of the invention are further disclosed in the claims and in following description.
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patent: 3312980 (1967-04-01), Erbach
patent: 3827187 (1974-08-01), Yamamoto et al.
patent: 4081200 (1978-03-01), Cheung
patent: 4761037 (1988-08-01), Medeot
patent: 5361993 (1994-11-01), Andersson
patent: 5500659 (1996-03-01), Curran, Jr. et al.
patent: 6024147 (2000-02-01), Hunter, Jr.
patent: 2 027 776 (1980-02-01), None
patent: 2046394 (1980-11-01), None
patent: WO 85/02211 (1985-05-01), None
patent: WO 92/03269 (1992-03-01), None
patent: WO 93/14296 (1993-07-01), None
Aquajet Systems Holdings AB
Hartmann Gary S.
Lillis Eileen D.
Zarley McKee Thomte Voorhees & Sease
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