Patent · US Expired

Rotary tiller for maintaining cross country ski trails

US4559725A · kind A · utility

7Cited by

9References

3Claims

0Family size

Assignee

Karl Kaessbohrer Fahrzeugwerke GmbH · DE

Inventors

Erwin Wieland · Wien, AT
Walter Haug · Blaustein, DE

Key dates

Filing date	Sep 14, 1984
Grant date	Dec 24, 1985
Priority date	—
Expiry date	Sep 14, 2004

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE01H4/02
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A rotary tiller for maintaining cross country ski trails has a rotary shaft with at least one array of radially extending first cutters flanked by laterally adjacent arrays of radially extending second cutters. The radial lengths of the first cutters are greater than the radial lengths of the second cutters. The first cutters are arranged to till a center ski track and the second cutters are arranged to till pole tracks on either side of the ski track, with the ski tracks having a tilled depth greater than that of the pole tracks.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.