Excavating – Snow or ice removing or grooming by portable device – With melter
Patent
1994-07-11
1996-03-19
Dorner, Kenneth J.
Excavating
Snow or ice removing or grooming by portable device
With melter
37197, 37228, 239130, 239135, 239687, E01C 1920
Patent
active
054994624
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
There are many situations where it is desirable to counteract slipperiness caused by ice, snow, mud, sleet and the like. This can be done, for example, by salting or sanding.
Not least, this applies to airplane runways. Here, urea is used in order to "melt" the icecover and sand with a particular grain size to provide good friction, because airplanes can not tolerate road salt or sand of the wrong grain size. The sand or urea is spread with a special spreading vehicle. The effectiveness of sanding can be considerably increased if the sand is preheated, because the sand then melts solidly to the icecover on the runway and forms a sandpaper-like surface which provides very good friction against airplane wheels during landing and take off.
Sand preheating creates the need for methods and devices to heat the sand. In a currently used system, the sand is stored, continuously heated, in a large silo from which the sand is conveyed to the spreading vehicle and placed in the spreader hopper. The heated sand is conveyed within the spreading vehicle and spread out as desired.
The above described technique suffers from serious disadvantages. In the first place, it requires large investments for the above mentioned sand silo. Secondly, because the entire mass of sand is kept continuously heated, the sand silo represents a waste of energy which also leads to high costs. Thirdly, the technique is not particularly effective because the sand continuously loses heat from the moment it is loaded onto the spreading vehicle. Our measurements show that, in fact, the sand has only a fraction of its warmth left when it reaches the spot where it is to be scattered.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a vehicle-borne method and apparatus to scatter a preheated material onto a surface, especially a preheated, granular anti-slip material onto runways and roads, in which the above described drawbacks are avoided and which gives a high safety level and good control and adjustment. An additional object of the invention is to provide a heating device of the above type which admits of simple installation to existing vehicles. A still further object of the invention is to provide a method and apparatus of the above type which is amenable to low costs, as regards material, installation and fuel consumption.
The foregoing objects are attained in a process for scattering granular material at a raised temperature from a vehicle over a roadway, comprising the steps of feeding the granular material from a supply container in the vehicle by a feed means to an upper, upstream portion of a substantially vertically deposit shaft, conveying the granular material downwardly through the shaft to a scattering means at a lower, downstream portion of the shaft, and heating the granular material during passage thereof downwardly through the shaft by combustion gases flowing under pressure through the shaft from the upstream portion of the shaft to separate and uniformly heat individual particles of the granular material. In this manner, the combustion gases assist transporting the particles through the shaft.
The foregoing objects are also attained by an apparatus for scattering granular material at a raised temperature from a vehicle over a roadway. The apparatus comprises a supply container for holding granular material, and a substantially vertical shaft having an upper, upstream portion, a lower, downstream portion and a central axis. Feed means extends between the supply container and the shaft for conveying granular material from the supply container to the upstream portion of the shaft. Scattering means is located adjacent the downstream portion of the shaft for dispersing the granular materials. Heating means heats the granular material in the shaft. The heating means includes a burner having a nozzle means disposed above and directed towards the upstream portion of the shaft. The nozzle means is oriented substantially coaxially with the central axis of the shaft for flowing co
REFERENCES:
patent: 3844669 (1974-10-01), Eigenmann
patent: 3853455 (1974-12-01), Riordan et al.
patent: 4409957 (1983-10-01), Muhammad
patent: 4575010 (1986-03-01), Zimmerman
patent: 4978068 (1990-12-01), Eldridge
Forsdahl Sixten
Torner Hakan
Chop Andrea
Dorner Kenneth J.
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