Feeding device

Excavating – Snow or ice removing or grooming by portable device – With endless conveyor

Patent

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Details

198671, 198676, E01H 509

Patent

active

043936091

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD AND BACKGROUND OF THE INVENTION

By the Swiss patent specification No. 575,515 a feeding device is previously known which comprises a rotary drum in the casing wall of which one or more openings are provided to serve as intakes with which blade-like elements cooperate, said blade elements projecting outwardly from the outside of the casing wall so as to rip and carry along goods and bring it into the interior of the drum through said intake upon rotation of the drum, means being provided inside the casing wall for conveying the goods introduced into the drum to an outlet opening at an end of the drum. This feeding device is made in the form of a snow-blowing machine by means of which snow can be picked up from the ground and fed to a conventional ejector tube which in turn blows out the snow in the desired direction.
In the above-mentioned structure the intake openings consist of holes arranged in several, more precisely two rings which are spaced apart along the longitudinal axis of the drum, though located close to each other, said rings each including a plurality of individual holes which are radially displaced relative to each other in the various rings in such a way that interspaces occur between the holes in adjacent rings. This means that the snow material will be introduced intermittently into the interior of the drum and bring about a comparatively irregular feeding of the material through and out of the device in question. Besides the holes are approximately square-shaped having a rather great area in comparison with the total area of the drum; a fact that entails the risk that stones or similar big and hard objects get into the interior of the drum and thereafter inflict damage on the drum as well as parts connected thereto.


SUMMARY OF THE INVENTION

The object of the present invention is to eliminate the drawbacks of the previously known feeding devices of the above-mentioned type and provide a feeding device which works with an extremely regular and effective feeding of the material in question. According to the invention this is achieved by a device which is characterized in that the intake opening is in the form of a narrow slot which together with the adherent blade element extends helically along the casing wall and that the means for conveying the material to the outlet opening consists of a flange which projects from the inside of the casing wall towards the interior of the drum and which flange like the slot and the blade element extends helically in the direction from one of the ends of the drum towards the other. According to a preferred embodiment of the invention the helix of said interior flange is opposite to the helix of the exterior blade element. Though the feeding device of the invention per se is possible to use in snowblowing machines it may in practice, with particular advantage be used for feeding such bulk materials as grain, chemicals and the like.


BRIEF DESCRIPTION OF THE DRAWINGS

With reference to the appended drawings a closer description of the invention will follow hereinafter.
In the drawings:
FIG. 1 is a perspective view of the feeding device of the invention in the general design thereof, parts of the device having been broken away for the sake of clarity,
FIG. 2 is an enlarged cross section through the device shown in FIG. 1,
FIG. 3 is a perspective view illustrating a prototype of a drying apparatus in which the device of the invention is included, parts of said apparatus having been broken away, and
FIGS. 4 to 6 simple sketches illustrating three different practical fields of application of the feeding device in question.


BEST MODE OF CARRYING OUT THE INVENTION

The feeding device shown in its isolated state in FIGS. 1 and 2 is made of a drum generally designated 1 which is rotatable in any arbitrary manner. In the casing wall 2 of this drum two slots 3, 4 are present in order to serve as intakes, said slots extending helically between the two opposite ends of the drum. With these opening slots blade-like elements in the form of strips 5

REFERENCES:
patent: 553403 (1896-01-01), Gulbransen
patent: 1401155 (1921-12-01), Jacoby
patent: 2038904 (1936-04-01), Rand
patent: 3696535 (1972-10-01), Kallio
patent: 4146145 (1979-03-01), Easton
patent: 4222502 (1980-09-01), Gubitose et al.

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