Track sanders – Sand feeders – Chain
Patent
1986-06-04
1988-03-29
Dorner, Kenneth J.
Track sanders
Sand feeders
Chain
222371, 222415, 198858, 291 25, B61C 1510
Patent
active
047338911
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a grit spreader for motor vehicles comprising a container for the gritting material and a dispersion channel leading to a vehicle wheel and having a conveying installation and an outlet that can preferably be closed by means of a bottom flap.
Various types of spreaders are already known, these spreaders being operated in the event of an emergency, particularly in the event of sudden slippery conditions, in order to spread sand or grit directly in front of the wheels of a motor vehicle. It is known to use various sytems for transporting sand from the storage bin to the dispersion site. The German O.S. No. 30 45 546, for example, shows a worm conveyor in the dispersion channel and the Austrian Pat. No. 349,328 shows a vibrating chute for transverse conveyance. Conveyance by means of gravity from a closable container and the use of air or exhaust gases have likewise already been proposed.
On the whole, all of the known proposals cannot satisfactorily solve the problem of spreading sand for motor vehicles since the conveying system is continuously subjected to changing conditions or is from the start poorly suited. Thus, transporting sand and, above all, grit by means of worm conveyors, which ensure a continuous transport, is disadvantageous on account of wear and tear, abrasion and the danger of blockage. The continuous conveyance and above all the immediate readiness for use of the gritting material is not guaranteed with vibrating chutes, however, on account of vehicle vibrations, vibrations due to road conditions as well as the side forces when driving around corners. With flaps loaded directly with grit or sand, valves for compressed-air lines are operationally unsafe through possible obstructions or the build-up of material, and there is, in addition, in the end caps loaded with grit or sand, the danger of the sand or grit freezing at the channel outlet.
It is the object of the invention to find a solution which to a greater degree guarantees the function of the spreader in an emergency.
This is achieved according to the invention in that an endless conveyor is arranged in a first section of a dispersion channel serving as a conveying installation, said endless conveyor being divided into individual chambers by transverse webs and its discharge end lying above a second section of the disperion channel comprising an outlet, a drive unit of the conveyor being provided with a follow-up control which stops the drive unit following actuation of a cutout switch only when a transverse web of the conveyor enters the upper return section of the conveyor pulley disposed at the discharge end.
Conveyors with transverse webs and lateral walls which are variable in length by means of folds are known, for example, from the German Pate. Nos. 18 16 273 and 21 00 364. The conveyor lies directly below the open container outlet so that when the conveyor is put into opeation grit is conveyed continuously. The horizontal conveying distance is thereby unimportant. It is thus possible, on the one hand, to place gritting material in front of the wheel from every position in the motor vehicle suitable for accommodating the grit container. On the other hand, the horizontal conveying distance can be so short that the conveyor essentially only forms a narrowing of the container outlet to the cross-section of the second conveyor section. At the discharge end the gritting material falls freely through the downwardly directed section of the dispersion channel, its bottom flap, which is preferably provided, being opened when the conveyor is switched on. By means of the follow-up control the conveyor stops when switched off in such a way that a transverse web is located at least in one vertical plane of the conveyor pulley at the discharge end or has entered just into its upper return section, and when switched on again the chmaber closest to the discharge end is emptied immediate. As a result of this, that transverse web of the conveyor prevents a premature emptying of the chamber over the discharge end
REFERENCES:
patent: 423906 (1890-03-01), Conkling
patent: 2574287 (1951-11-01), Rome
patent: 4062974 (1977-12-01), Herbold
Anderson Gerald A.
Dorner Kenneth J.
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