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Arrangement in a snowmobile equipped with an apparatus for intensifying steering

Imported: 24 Feb '17 | Published: 06 Jan '04

Antti Vuolle-Apiala

USPTO - Utility Patents

Abstract

An arrangement in a snowmobile equipped with an apparatus for intensifying steering modifies the ski of the snowmobile to include a drum rotated by means of actuators, the drum forming at least part of the bearing surface of the ski. The rotation axis of the drum is oriented such that when the drum rotates, the circumferential surface of the drum moves transversely to the longitudinal axis of the ski. The drum is provided with one or more ridges protruding from its circumferential surface essentially parallel with the rotational axis of the drum. The drum is provided with one or more locking means arranged to lock the drum in a predetermined position when the apparatus for intensifying steering is not being used or to allow the drum to rotate when operation of the apparatus for intensifying steering is desired.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is described in greater detail in the following with reference to the appended drawings, in which:

FIG. 1 shows a diagrammatic side view of a snowmobile equipped with prior art apparatus for intensifying steering;

FIG. 2 shows a section along line II—II of FIG. 1;

FIG. 3 shows a diagrammatic side view of a ski provided with the arrangement relating to the invention;

FIG. 4 shows a section along line IV—IV of FIG. 3; and

FIG. 5 shows a section according to FIG. 4 when the drum is in the unlocked position.

Claims

1. An arrangement in a snowmobile equipped with an apparatus for intensifying steering comprising the ski of the snowmobile and a drum rotated by means of actuators, the drum forming at least a part of the bearing surface of the ski, the rotation axis of the drum being fitted with bearings in such a way that when the drum rotates, the circumferential surface of the drum moves transversely with respect to the longitudinal axis of the ski, and which drum is provided with one or more ridges protruding from its circumferential surface, the ridges being essentially parallel with the rotation axis of the drum, characterized in that the drum is provided with one or more locking means for preventing the rotation of the drum, the locking means being arranged to lock the drum into a predetermined position when the apparatus for intensifying steering is not used and, correspondingly, to allow the drum to rotate when the apparatus for intensifying steering is used.

2. An arrangement as claimed in claim 1, characterized in that in at least one locking position of the drum, a ridge is arranged to extend at least partly through an opening made for the drum on the bottom of the ski.

3. An arrangement as claimed in claim 1, characterized in that in at least one locking position of the drum, that part of the drum which forms a part of the bearing surface of the ski is designed to substantially correspond to the shape of the bottom of the ski.

4. An arrangement as claimed in claim 2, characterized in that in a least one locking position of the drum, that part of the drum which forms a part of the bearing surface of the ski is designed to substantially correspond to the shape of the bottom of the ski.

5. An apparatus for intensifying the steering of a snowmobile comprising:

6. The apparatus of claim 5, wherein the portion of said circumferential surface which forms at least part of said bearing surface when said drum is in said predetermined position is configured to correspond substantially to the shape of said bearing surface.

7. The apparatus of claim 5, wherein said at least one ridge comprises a plurality of ridges.

8. The apparatus of claim 8, wherein one of said ridges is constructed to withstand forces exerted on the bearing surface during use of the snowmobile and said one of said ridges projects through said opening substantially along the longitudinal axis of said ski when said drum is locked in said predetermined position.

9. The apparatus of claim 6, wherein said drum comprises a recess and said locking means comprises a solenoid solidly fitted to the ski, said solenoid comprising a locking pin arranged to selectively penetrate said recess to prevent said drum from rotating.