Track sanders – Sand feeders
Patent
1984-02-01
1985-12-03
Nase, Jeffrey V.
Track sanders
Sand feeders
291 41, 239689, B60B 3904
Patent
active
045562431
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
This invention relates in general to automobile servicing equipment and in particular to a new and useful device for dispensing an abrasive material onto a roadway in the vicinity of the wheels of a vehicle.
The invention relates to a device for motor vehicles for dispensing sand under the effect of gravity, comprising at least one refillable sand container, a sand channel whose end associated with a wheel of the motor vehicle forms a sand outlet, and comprising two closing means interrupting the sand flow, the first of said means being associated with the outlet of the sand container and the second one forming the sealing of the sand outlet, and their actuation being dependent upon each other.
A sand-dispensing device of this kind can, for example, be found in the U.S. Pat. No. 3,888,524. In this case, an intermediate container is inserted in the sand channel, and the two closing means alternately open and close the inlet and the outlet of the intermediate container which forms the sand outlet. The two closing means are to this end arranged at a common support which is slideable in the intermediate container and whose motion is effected by means of a pressure medium, cable traction or the like. Hence, when the closing means sealing the outlet is in the closed state, sand is located thereon and renders opening of the outlet at least more difficult. At low temperatures, humidity entering from below may cause icing of the sand so that the sand-dispersing device gets out of function. But also closing of the outlet closing means may be disturbed by the sand which flows down during the closing motion because of the simultaneous opening of the inlet closing means.
SUMMARY OF THE INVENTION
It is now the object of the invention to improve the sand dispensing device such that dispersion of sand is ensured at any time and that the closing means facing the sand outlet remains operative without any malfunctions.
According to the invention this is achieved in that both closing means open simultaneously and that the first closing means at the outlet of the sand container closes earlier than the second closing means at the sand outlet.
According to the solution proposed by the invention, the former double function of the sand outlet sealing, i.e., to retain the sand in the container and to protect the sand outlet against mud and wetness, is assigned to the two closing means. The closing means of the sand container retain, in the usual manner, the sand in the container. As they close earlier than the sand outlet sealing, the sand which is still in the sand channel is dispensed, and the sand channel is fully discharged before the closing means of the sand outlet closes. The sand outlet sealing therefore has simply a protective function against wetness and mud, so that the sand is prevented from freezing to the inner side of the sand outlet closing means, and in cases where grit is used as dispensing material, the latter-mentioned is also prevented from getting stuck in the sand channel and in the region of the sand outlet. On the other hand, due to the sealing of the discharged sand channel, the container sealing itself is also protected against wetness, so that here and in the sand container, too, the danger of frozen sand is obviated. The first closing means can, hence, be opened at any time, and the sand remains dispensible. When required, the sand must very rapidly be dispensed in front of the wheels of the vehicle, and therefore the two closing means open simultaneously, and as a result the sand gets immediately from the sand container onto the roadway.
An embodiment of the invention provides that the outlet of the sand container engages in a funnel-like widened portion of the sand channel in which the first closing means are movable. This helps to simplify the construction, as in this embodiment the two closing means are provided at the beginning and at the end of the sand channel. Preferably both closing means are formed by flaps which are pivotable about swivelling axles an
REFERENCES:
patent: 1501650 (1924-07-01), Dienstbach et al.
patent: 1669408 (1928-05-01), Behrens
patent: 1818815 (1931-08-01), Rothstein
patent: 1833084 (1931-11-01), Liedberg
patent: 3885823 (1975-05-01), Lee
patent: 3888524 (1975-06-01), Lee
patent: 3938835 (1976-02-01), Lee
Moon, Jr. James R.
Nase Jeffrey V.
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