Snow-plow

Details Snow-plow Snow-plow

1990-05-08

1992-05-05

Reese, Randolph A.

Excavating

Snow or ice removing or grooming by portable device

Vehicle mount with obstacle responsive trip, or yieldable tool

37271, 403328, E01H 504

Patent

active

051096188

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a snow plow.
A snow plow of the general nature of the present invention is disclosed for example, in German Published, Non-examined Patent Application DE-OS 21 45 215. This snow plow has on the back of each blade two lateral curved guides. This curved guidance is intended to assure that, when an obstacle on the ground is encountered, the respective blade is turned out around the center of the curved guidance in respect to the obstacle, the scraping edge driving up against the obstacle first being pivoted towards the back and then being lifted up on the curve of the circle so that the obstacle can be overridden.
The respective blade is maintained and returned into the initial position by a plurality of spring tension devices.
In connection with the foregoing known snow plow, a connection at only a point or line is made because of the specific curved guidance, even if bearing rollers are used. In case of particularly heavy snow removal, however, the forces acting on the supports are strong enough that they result in not inconsiderable damage and disadvantages. Moreover, problems arise in connection with the setting of the restoring force and with the return of the blade into the operational position once it has been deflected. A relatively large pivot path is traversed in the course of the deflection movement of the blade, in the course of which the spring elements, which act on the top of the back of the blade, are stretched over a large travel of the spring. This then means that the restoring force further increases, dependent on the spring travel. A compromise is hard to find in actual use to, on the one hand, be able to set the release forces as high as possible in case of hard removal and, on the other, not to allow the restoring forces, which further increase with the stretching of the restoring springs, to become too great.
It is therefore the object of the present invention to overcome the disadvantages of the state of the art and to further providing an improvement snow plow which affords increased support, and deflection movements without problems throughout the full range of the deflection movement.
A curved slide bearing is used for the first time with the snow plow of the present invention, which results in all-over support and force absorption. Because of this, and especially with heavy removal, the occurring forces can be supported and absorbed without problems and without leading to an impairment of the bearing elements. Because of the additional use of a force limiter it is possible to set the triggering forces without problem when a ground obstacle is encountered. The force limiter has the further considerable advantage that after the triggering forces have been overcome, the characteristic magnitude of force, for all practical purposes, abruptly drops down to another, preset and much lower value in order to perform the pivot movement of the blade to the end without problem after driving up against an obstacle on the ground and overcoming the triggering force. This makes possible a safe crossing over the ground obstacle.
In a particularly preferred embodiment it is of course also possible to provide slide bearings for the lateral support of each one of the blades.
The use of a first curved segment and a second one cooperating with it has proven particularly advantageous. These are designed to interact in the manner of a groove/spring connection and thus are captively guided slidingly in respect to each other. In this way the lateral forces are also being absorbed.
Plastics are particularly suitable as materials for the slide bearing.
In the snow plow of the invention it is possible without problems to change and pre-set the pitch angles of the scraper edge. For this purpose the position of the force limiter, which is supported at least indirectly between one blade and the support frame, can be changed at least at one connecting point, by means of which the angular position of the deflectable blade and thus the pitch angle of a scraper ed

REFERENCES:
patent: 3626614 (1971-12-01), Kahlbacher
patent: 3650054 (1972-03-01), Hanson
patent: 3775877 (1973-12-01), Gove, Jr.
patent: 4843744 (1989-07-01), Jansen

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