Self cleaning cutting head for mowers

• US 5,916,111 A
• Filed: 10/23/1997
• Issued: 06/29/1999
• Est. Priority Date: 02/10/1995
• Status: Expired due to Term

• Current Assignee: Husqvarna AB (HUSQVARNA)
• Original Assignee: Husqvarna AB (HUSQVARNA)
• Inventors: Colens, Andre
• Primary Examiner(s): MELIUS, TERRY L
• Application Number:
  US08/875,797
• Time in Patent Office: 614 Days
• Field of Search: 56/10.2 A, 56/255, 56/295, 56/17.5, 56/DIG. 15, 56/DIG. 17, 56/DIG. 20, 56/12.1, 56/12.7, 56/11.9, 30/276
• US Class Current: 56/11.9
• CPC Class Codes: A01D 2101/00 Lawn-mowers
• CPC Class Codes: A01D 34/736 Flail type
• CPC Class Codes: A01D 34/82 Other details
• CPC Class Codes: Y10S 56/17 Cutter details

Abstract

The invention relates to a cutting head, more particularly for a lawnmower with a rechargeable battery, comprising an electric motor (1) with a driving shaft (3) connected to a cutting disk (4) perpendicular to said shaft (3). The cutting disk (4) is provided with at least one blade (5) at its periphery. There is also provided a lower plate (7) parallel to and located under said cutting disk (4). The lower plate (7) is free wheeling around the axis though the use of a roller bearing (8). In the case of friction or jamming due to debris, the lower plate (7) starts to rotate to expel the debris by centrifugal effect.

Claims

1. A lawn mower, comprising an electric motor supplied with electrical energy from a rechargeable battery, and being provided with a cutting head, said electric motor having an output shaft which is connected to a cutting disc located perpendicularly to the shaft, said cutting disc comprising at its periphery at least one blade wherein said cutting head also comprises a lower plate which is parallel with and located under the cutting disc, the lower plate being mounted in a free-rotating arrangement on said shaft by bearing means such that the lower plate normally rotates only slightly or not at all and wherein, in response to debris lodged between said cutting disc and said lower plate, said lower plate is caused to rotate with said cutting disc to centrifugally eject debris introduced between the cutting disc and the lower plate.

2. Lawn mower according to claim 1 wherein the bearing means is a ball bearing.

3. Lawn mower according to claim 1 wherein the peripheral blade or blades are retractable towards the rotation axis.

4. Lawn mower according to claim 1, wherein the rotation axis is inclined forwards relative to the direction of movement of the cutting head mounted in the mower.

5. Lawn mower according to claim 2 wherein the peripheral blade or blades are retractable towards the rotation axis.

6. Lawn mower according to claim 2, wherein the rotation axis is inclined forwards relative to the direction of movement of the cutting head mounted in the mower.

7. Lawn mower according to claim 3, wherein the rotation axis is inclined forwards relative to the direction of movement of the cutting head mounted in the mower.

8. Lawn mower according to claim 5, wherein the rotation axis is inclined forwards relative to the direction of movement of the cutting head mounted in the mower.