Working tool with replaceable working bit

• US 20030037936A1
• Filed: 02/15/2002
• Published: 02/27/2003
• Est. Priority Date: 02/04/2000
• Status: Active Grant

• Current Assignee: Kverneland Klepp As
• Original Assignee: Kverneland Klepp As
• Inventors: Skjaeveland, Magne
• Granted Patent: US 6,607,040 B2
• Time in Patent Office: Days
• US Class Current: 172/749
• CPC Class Codes: A01B 15/06 Interchangeable or adjustable shares

Abstract

A replaceable wear part (13, 22, 22a, 32, 41) for mounting on a leading edge (12, 27) of a working tool (10, 27, 30), said leading edge and said wear part having co-operative guide formations (16, 18) extending generally perpendicular to the leading edge and which provide a socket and projection type of slidable inter-fit whereby the wear part can be driven by a force extending generally perpendicular to the leading edge in order to take-up a working position in which it is secured against displacement from the working position by frictional inter-engagement between the guide formations (16, 18) on the wear part and the leading edge, and without need for threaded or other separate removable fasteners.

Claims

1. A replaceable wear part (13, 22, 22a, 32, 41) for mounting on a leading edge (12, 27) of a working tool (10, 27, 30), said leading edge and said wear part having cooperative guide formations (16, 18) extending generally perpendicular to the leading edge and which provide a socket and projection type of slidable inter-fit whereby the wear part can be driven by a force extending generally perpendicular to the leading edge in order to take-up a working position in which it is secured against displacement from the working position by frictional inter-engagement between the guide formations (16, 18) on the wear part and the leading edge, and without need for threaded or other separate removable fasteners.

2. A replaceable wear part according to claim 1, in which the co-operative guide formations (16, 18) allow the wear part (13) to slide in a direction generally perpendicular to the leading edge, and are arranged to exert a wedging action on the wear part, so that the greater the distance travelled, the stronger will be the frictional engagement forces acting between the guide formations.

3. A replaceable wear part according to claim 2, in which the guide formations (16) in the leading edge (12) of the tool (10) form a socket whose width reduces with distance perpendicularly inwardly of the leading edge (12), so that a progressively increasing wedging force can act on a wear part (13) as it is driven internally of the socket.

4. A replaceable wear part according to anyone of claims 1 to 3, and in combination with a working tool, in which the socket is defined between a pair of opposed side walls (16) which are convergent or taper, and the wear part (13) has opposed external side faces (18) which are also convergent or taper, but to a lesser extent than the tapering of the side walls (16) of the socket, so that an increasing wedging force is generated therebetween as the wear part (13) is driven to its working position, whereby also the frictional resistance against possible displacement increases progressively.

5. A combination according to claim 4, in which the co-operative guide formations (16, 18) have an inter-engagement which opposes any relative rotation of the wear part about its longitudinal axis.

6. A combination according to claim 5, in which the walls or faces (16, 18) defining the guide formations are of matching V-shape in cross section.

7. A wear part according to any one of claims 1 to 3, and adapted to be mounted on a transversely extending leading edge of an agricultural tool, such as a point (30), a plough share (10) a cultivator tine (27), or a holding portion (27) of an agricultural tool.

8. A wear part according to any one of the preceding claims, and comprising a main holder 40 which is detachably securable to a tine 42, and to which a point 41 is detachably secured, and in which the holder 40 comprises two parts, namely a main holder part 43 and a rear/upper holder part 44 which can be fastened to the tine 42 via a single fastener 45, and which has a tongue and groove type of interfit 46, 47 with the main holder part 40 to prevent rotation about the fastener, said rear/upper holding part also serving to act as a wear protecting plate for the tine.