FI58191C - SNOESLUNGA - Google Patents

Description

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Patent ·] m registered .............,. , ..., _ * (44) NlhUvUulptnon et al. - ratent- och registerstyrelsen Arattku utltgd oeh uti. * Krtft * n publinnd 29.08.80 "(32) (33) (31) privilege — Begird prlorlttt (71) (72) Lauri Alarik Tenhunen, 7 ^ + 700 Kiuruvesi, Suomi- Finland (FI) (74) Forssen & Salomaa Oy (54) Lumilinko - Snöslunga

The invention relates to a snow thrower having a frame structure, guide vanes in said frame structure, a rotor housing, a shaft of a snow thrower, and in which a circular plate attached to its axis forms a rotating rear wall of the rotor housing.

Snow plows, snow throwers and snow throwers are used to keep the roads open during the winter. With regard to snow throwers, reference is made in the prior art to Finnish patents 27,938, 33,755 and 33,756, Swedish patents 150,594 and American patents 2,605,561 and 2,882,620. Finnish patent publication 42,336 discloses a snow thrower using plastic casting vanes molded in a certain shape. . The disadvantage of previously known snow throwers has been that they are not suitable for all snow conditions. The power of normal 40 hp agricultural tractors has not been enough to use snow blowers known in snowshoe conditions. This is due to the fact that the snow throwers have had some kind of rear wall gap behind the throwing wheel, whereby as snow penetrates between the rear wall and the 2 58191 throwing blades, there is friction, which causes a harmful additional load on the drive machine. Even a small separate rear wall behind the rotor causes the friction-induced heating and consequent increasing ice formation in the intermediate space as the snow rotates there. As the ice increases, the pressure and friction increase, removing power from the drive and twisting the shaft of the snow thrower, often the rotor. This drawback has been eliminated in the applicant's previous snow thrower by attaching to the shaft of the snow thrower a circular plate forming a rotating rear wall of the rotor housing, to which the snow throwing vanes are attached.

The disadvantage of previously known snow throwers has been the snow throwing wing structure, which endangers occupational safety. As is known, the wing structure is formed of welded or otherwise attached metal wings. Such a wing breaks, for example, when a stone enters the rotor housing. Due to the massive structure, the broken wing piece is thrown out with tremendous force and can fly up to 100 meters away. Another disadvantage of the metallic wing structure is that the cleaning properties of the snout under snow conditions are poor because the snout snow adheres to the metallic wing structure.

The object of the invention is therefore to provide an improvement in the snow throwing wing structure of a snow thrower and to provide a snow thrower which meets high occupational safety properties and which also performs equally well in all snow conditions. Other objects and advantages of the invention will be apparent from the description of the invention.

In order to achieve these objects, the snow thrower according to the invention is mainly characterized in that the snow ejection vanes fixed to the circular plate forming the rotating rear wall of the rotor housing are made of a flexible material, preferably rubber, and that said snow ejection vanes

The invention will be explained in more detail with reference to a preferred embodiment of the invention shown in the figures of the accompanying drawing, to which, however, the invention is not intended to be exclusively limited.

Figure 1 schematically shows a snow thrower according to the invention.

Fig. 2 shows the structure according to Fig. 1 in a horizontal section.

Figure 3 shows an axonometric view of an embodiment of a snow thrower according to the invention.

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In Figures 1 and 2, a snow thrower according to the invention is generally indicated by reference numeral 10. The snow thrower 10 has a frame structure 11 with guide vanes 18 opening in the direction of travel. The guide vanes 18 have diagonally cutting blades 19. The guide vanes 18 collect snow into the rotor housing 12. The rear wall of the rotor housing 12 is either completely omitted or only minor edges 14 are built into the outer circumference of the rotor housing 12. The omitted rear wall is marked with a dashed line 13. Such a structure eliminates, in particular, the congestion of snake snow between the snow ejection vane 16 and the rear wall if the snow thrower had a separate rear wall. The shaft or rotor of the snow thrower is indicated by the reference number 15. A circular plate 17 is attached to the shaft 15 of the snow thrower, which forms the rotating rear wall of the rotor housing 12. The snow thrower 10 also has guide and adjustable feet on the sides, with sharp edges 20 from below preventing side slippage and improving work efficiency.

Figure 3 shows an axonometric view of an embodiment of a snow thrower according to the invention. The snow ejection vane 16 has a part 21 by which the vane 16 is fixed to the rotating rear wall 17 of the rotor housing 12. The mounting holes in the part 21 are indicated by reference numeral 22. The snow ejection vane 16 has a reinforcing edge 23. According to the invention the vanes 16 are made of flexible material, preferably rubber the rotor housing 12 are not easily broken. However, if the resilient wing 16 breaks, the work safety endangerment of the piece detached from the wing 16 is not nearly as great as that of the metal piece. In addition, the snow ejection vanes 16 of flexible material can vibrate as they rotate, thus preventing the snow from sticking to the snout, which contributes to the need for snow thrower, and with the snow thrower according to the invention the centrifugal work can be performed by a 30 hp tractor.

Only a preferred embodiment of the invention has been described above, and it will be apparent to those skilled in the art that numerous modifications may be made therein without departing from the scope of the appended claims.