SELF-PROPELLED LAWN MOWER WITH CHIPPER

• US 20110239609A1
• Filed: 08/26/2009
• Published: 10/06/2011
• Est. Priority Date: 08/29/2008
• Status: Active Grant

• Current Assignee: Masport Limited
• Original Assignee: Masport Limited
• Inventors: Boswell, Gordon, Haraqia, Agron, McKay, David
• Granted Patent: US 8,544,248 B2
• Time in Patent Office: Days
• US Class Current: 56/16.9
• CPC Class Codes: A01D 34/005 Mulching means
• CPC Class Codes: A01D 34/69 with motor driven wheels
• CPC Class Codes: A01G 3/002 for comminuting plant waste comminuting by cutting implements in general B02C18/00

Abstract

A lawn mower with an integral chipper or shredder, comprising a deck that has a volute shape with a rearwards-facing funnel along one side, expanding towards and exiting at the rear of the deck, a skirt arranged around the perimeter of the deck to enclose a cutting space, a handle, front and rear wheel sets, and a motor having a drive shaft extending downwards through the deck, the mower also having grass cutting blades and shredder blades connected to the drive shaft, the chipper blades located above the grass cutting blades, the mower also having a chipper tube running through the deck and opening above the chipper blades, the mower also having a power take-off mechanism connecting to the rear wheels and the motor, and adapted to drive the rear wheels in use.

Claims

1. A lawn mower with an integral chipper or shredder, comprising:

a deck, having a general overall volute shape with a rearwards-facing funnel which runs along one side of said deck, expanding towards and exiting at the rear of said deck, the exit of said funnel forming an exit aperture at the rear of said deck,

a skirt arranged around at least part of the perimeter of said deck, said deck and said skirt enclosing a cutting space under said deck,

a handle connected to the rear of said deck,

a front wheel set and a rear wheel set located at the front and the rear of said deck respectively,

a motor attached to the outside top of said deck, said motor having a drive shaft extending downwards from said motor through said deck, the lower part of said drive shaft located substantially at the centre of said cutting space,

at least one grass cutting blade or blades,

at least one chipper or shredder blade or blades,

said at least one grass cutting blade and said at least one chipper blade connected to said drive shaft within said cutting space so that in use said drive shaft causes said at least one grass cutting blade to rotate in a substantially horizontal grass cutting plane and said at least one chipper blade to rotate in a substantially horizontal chipping plane, said chipper blade located above said grass cutting blade so that said chipping plane is above said grass cutting plane in said cutting space,

a chipper tube having an upper end and a lower end, said lower end opening into said cutting space above and within the perimeter of the chipper cutting disc formed by rotation of said at least one chipper blade in use,

said mower also having a power take-off mechanism connecting to said rear wheel set and said motor and adapted to drive said rear wheel set in use.

2. The lawn mower as claimed in claim 1 wherein said chipper tube is attached to said deck on the opposite side of the deck centre line to said funnel.

3. The lawn mower as claimed in claim 1 wherein said chipper tube is attached to said deck towards the rear of said deck.

4. The lawn mower as claimed in claim 1 wherein said power take-off mechanism is located on the same side of said deck as said chipper tube.

5. The lawn mower as claimed in claim 1 wherein said power take-off mechanism is located towards the rear of said deck.

6. The lawn mower as claimed in claim 1 wherein said power take-off mechanism is connected to said mower in such a manner that said power take-off mechanism is as close to the ground as possible.

7. The mower as claimed in claim 6 wherein said power take-off mechanism comprises at least a gearbox, an axle, a pulley wheel and a drive belt, said axle connected to said gearbox and also connected to said rear wheel set, said pulley wheel connected to said gearbox so that rotation of said pulley wheel drives said gearbox, said gearbox adapted to turn said axle when driven by said pulley wheel so that said rear wheel set is driven in at least a forward direction, said drive belt running in a continuous loop between said motor drive shaft and said pulley wheel, said drive belt connected to said drive shaft in such a way that said drive shaft drives said drive belt, said power take off mechanism and said chipper tube arranged so that said chipper tube passes through said continuous loop of said drive belt.

8. The mower as claimed in claim 7 wherein said gearbox, said pulley wheel and said drive belt are connected to said mower in such a manner that said gearbox is below said pulley wheel and said drive belt in use.

9. The mower as claimed in claim 8 wherein said gearbox is connected to said mower so that said gearbox is as close to the ground as possible.

10. The mower as claimed in claim 1 wherein the front part of said chipper tube extends to just above said chipper or shredder blade or blades, so that in use said chipper or shredder blade or blades drive refuse onto said front part, and pass just underneath said front part.

11. The mower as claimed in claim 1 wherein said chipper tube is angled backwards.

12. The mower as claimed in claim 1 wherein said chipper tube is positioned on said mower so that said tube is angled away from the direction of spin of at least said chipper or shredder blade or blades.

13. The A mower as claimed in claim 1 wherein said power take-off mechanism further comprises a shield, adapted to protect the power take-off mechanism from chips and to prevent the mechanism becoming clogged with grass clippings.

14. The mower as claimed in claim 1 wherein said exit aperture and said power take-off mechanism are sized and arranged so that said exit aperture extends as far across the rear of said mower as possible.

15. The mower as claimed in claim 13 wherein said shield is located on the inner side of said exit aperture, as close as possible to one side of said mower.