Road structure – process – or apparatus – Apparatus – Material distribution means
Patent
1994-09-09
1996-05-14
Neuder, William P.
Road structure, process, or apparatus
Apparatus
Material distribution means
404108, E01C 1948
Patent
active
055162282
DESCRIPTION:
BRIEF SUMMARY
The object of the invention is a spreading device for a road-construction mass substance, which intended to be used as an accessory to a machine equipped with a lifting boom, and which includes a feed silo for the mass to be spread and an opening through which the mass flows onto a road, field, or similar.
In road construction and basic improvements the spreading of the base course is an important phase of the work. The base course is usually formed of a suitable quality of gravel or crushed rock. Earth concrete is also used. At present the spreading of the base course usually takes place using the scoop of a wheeled loader, the pusher plate of a tracked tractor, or by a spreading device converted from an asphalt-spreading machine, one problem with which is that the layer of crushed material to be spread separates in such a way that the fine material drops to the bottom and the rough material rise to the surface, a consequence of which is an essential weakening of the load-bearing ability of the course in question. In addition, a problem with spreading using a wheeled loader or a tracked tractor is that the success in creating a level surface depends essentially on the skill of the driver, in which case the surface is often unsatisfactory. In the device converted from an asphalt-spreader an additional problem is the expense of the device and that at least two men are needed during spreading.
Various kinds of spreading devices for road materials are known from patent and application publications DE 812677, DE 939749, 2135033(H), and WO 89/01077, as well as from Finnish application 801407 (corresponds to SE 7903901-2). Generally these are towable trailers equipped with support wheels or roller wheels. A problem with towable spreading devices is the fact that trucks bringing the mass to be spread have to drive on top of the previously spread load. The WO publication does not present an ordinary spreading device as such, but a lateral movement device by means of which the mass is moved to the side of the line of driving. In the device in accordance with Finnish patent application 801407 there is a silo and an opening leading from it the rear plate of which limits the thickness of the mass to that desired. The device includes support wheels and skids. The device is advantageously rowed by a wheeled loader, by means of which it can be moved to another place of operation.
The Swedish road administration uses a spreader that grips the rear wheels of the truck that is discharging the mass, and consists mainly of a silo, a height limiter for the opening, as well as support wheels. These devices demand as least two men to operate it.
The intention of the invention is to create a simpler and more easily used spreading device than previous ones, by means of which, however, a precise spreading result can be achieved. In addition, a possibility of a simple adjustment of width and height is desired. In order to realize these the properties presented in the accompanying Patent claims are characteristic of a device in accordance with the invention.
A spreading device in accordance with the invention is pushed, contrarily to many known spreading devices. It is then possible to use any suitable machine, which is equipped with a lifting device. A scoop loader, in which the spreading device is installed in place of the scoop, is especially suitable for this purpose. The operating devices of the spreading device can then advantageously take their operating power from the hydraulic system of the machine. By means of a device in accordance with the invention the spread surface layer is compacted, so that it withstands the weight of the machine. The spreading height is determined by the difference in height between the roller wheels or other pre-compacting device and the support wheels. Other advantages and forms of application of the invention can be seen from the examples of application presented later.
In what follows the invention is described by reference to the accompanying figures, which show various road-construction mass s
REFERENCES:
patent: 4725163 (1988-02-01), Phillips
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