US 5,272,861 AGranted

Rotary agricultural tool

AssigneeKverneland Underhaug AS

InventorErling Roynberg

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Abstract

A rotary agricultural tool which may be incorporated in a number of different types of agricultural equipment, such as in a device for chopping up bulk material is disclosed. The rotary tool has an elongate cutter body mounted in a frame for rotation about a substantially horizontal axis and carrying on its outer periphery pivotally mounted cutter blades, a housing extending partly around the cutter body, and feed rollers for feeding the bulk material to the cutter body. The blades are arranged in pairs of blades. Each blade is mounted in position on the cutter body in such a way that: the blade is pivotable relative to its mounting between an outwardly extending operative chopping position and in inoperative position; the radially inner end of the blade is engageable with a stop in order to define the operative position; the general axis of the blade extends through the pivotal mounting and in a direction which is rearwardly inclined to a radius passing from the center of the elongated body and through the pivotal mounting with respect to the normal direction of rotation of the cutter body. A retarding device is coupled with the blade and tends to maintain the blade in any particular angular position about its pivotal mounting unless the blade is acted upon by a turning moment about its pivotal mounting which is in excess of a predetermined minimum turning moment determined by the retarding device.

Claims18

Dependent claims

A rotary agricultural tool which comprises:

an open-sided housing;
an elongated blade-carrying body rotatable in said housing;
a plurality of blades each having an inside face arranged along the length of the body;
and
pivotal mountings arranged along the outer periphery of the body and on which the blades are mounted, with each of blade having a first end and a second end, and at least the second end being movable through the open side of the housing upon rotation of the body in order to carry out a working operation;
each blade being mounted on the body in such a way that:
i. the blade is pivotable relative to its mounting between an outwardly extending operative position in which the second end is located radially outwardly of the first end, and an inoperative position;
ii. the blade is pivotable outwardly under centrifugal action to the operative position, and the first end is engageable with a stop in order to define the operative position;
and
iii. the general axis of the blade extends through the pivotal mounting and in a direction which is rearwardly inclined to a radius passing from the center of the body and through the pivotal mounting, with respect to the operative direction of rotation of the body;
characterized in that a retarding device is coupled with the blade and which tends to maintain the blade in any particular angular position about its pivotal mounting unless the blade is acted upon by a turning moment about its pivotal mounting which is in excess of a predetermined minimum turning moment set by the retarder device.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/836,349Filed 3 Mar 1992
Priority: GB 892111818 Sep 1989
Granted: 28 Dec 1993
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

A01F 29/095
Details: mounting or adjusting of knives
A01B 33/144
The rotating shaft being oriented horizontally: with spring tools or resiliently-attached rigid tools
A01D 34/52
Having cutters rotating about a horizontal axis, e.g. cutting-cylinders: cutting apparatus
A01F 29/005
Cutting apparatus specially adapted for cutting hay, straw or the like: for disintegrating and cutting up bales of hay, straw or fodder