AU597125B2

AU597125B2 - Cutter

Info

Publication number: AU597125B2
Application number: AU81666/87A
Authority: AU
Inventors: Alistair Edmond Stanley Gleeson
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-11-24
Filing date: 1987-11-23
Publication date: 1990-05-24
Anticipated expiration: 2007-11-23
Also published as: AU8166687A

Description

A 0 F 0 COMMONWEALTH OF AUSTRAL 1 PATENTS ACT 1952 75~ 1 1Fr COMPLETE

SPECIFICATION

(ORIGINAL)

FOR OFFICE USE Class Int. Class .02kpplication Number: Lodged: d0 0a a 00a 9 0 qrnplete Specification-Lodged: Accepted: Published: Priority: Related Art: 4'C lt.j .r A d~ .d Go 0 Name of Appiicant: TO BE COMPLETED BY APPLICANT ALISTAIR EDMOND STANLEY CLEESON ETTRICK RMB 2280 CAMPERDQW'L__VIC.

Address of Applicant: 3260 Actual Inventor: Address for Service: ALISTAIR EDMOND STANLEY GLEESON S AND ERt0CK 5I'ITTH &8E*OL E Complete Specification for the invention entitled: CUTTER The following statement iti a full description of this invention, including the best method of performing it known to me:- Ig .I 1 i I~

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2 1 2 3 4 6 7 8 9 11 o 12 o 13 14 o 0 16 17 18 19 S 21 o 22 23 24 26 o000 27 28 29 31 32 33 34 36 S 37 This invention relates to a cutter. In a particular aspect this invention relates to a cutter for hay or other cereal stalk and a cutter for cutting grass. In a particular aspect this invention relates to a mower fitted with such a cutter.

Conventional mowers include a cutter comprising a disc which is rotated about a first vertical axis. Attached to the disc at the periphery thereof are cutting blades. Those cutting blades are pivotally attached to the disc to pivot about second vertical axes parallel to the first vertical axis such that in use if a cutting blade should strike a stone or other hard object it should pivot about the respective one of those second vertical axes away from the stone or other hard object.

In practice, however, the cutting blades and or the second vertical axes of such conventional mowers are prone to being damaged.

The present invention provides a grass, hay or like cutter adapted to be rotated in a direction in a plane of rotation about a first vertical axis and comprising a support plate, a number of cutter blade assemblies mounted to the support plate above the support plate to pivot about respective second axes and wherein the cutter blade assemblies comprise a cutter blade and a linkage; wherein the cutter blade is mounted to the linkage to pivot about a respective third axis and the linkage is connected to the support plate to pivot about the respective second axis and wherein said second axes are oriented such that in use on one of the cutter blade assemblies striking a stone or other hard object that cutter blade assembly will tend to pivot about the respective one of said second axes and at the normally outboard end of the cutter assembly will rise with respect to the support plate and the cutter blade assembly will locate in board of the periphery of the support plate and above the support plate where from the cutter blade assembly may return to a condition in which the linkage and the cutter blade extend generally radially outwardly of the vertical first axis under the influence of centrifugal 900108. c_sdat.069gleeson.1. 2 lli- 3 1 2 3 4 6 7 8 9 11 12 0i 13 14 St 15 16 r t 17 18 19 21 22 o co 23 o. 24 00 24 0 0 25 26 I oo 27 r *28 29 31 32 33 34 36 force.

Said second axes may be upwardly outwardly or inwardly inclined with respect to said first axis. In one instance said second axes are not upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate.

Said second axes may be upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate. In one instance said second axes are not upwardly outwardly or inwardly inclined with respect to said first axis.

If desired, said second axes may be both upwardly outwardly or inwardly inclined with respect to said first axis and upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate.

The linkages can serve to give effective length to the cutter blade assemblys and can be more rigid and less prone to damage than the cutter blades themselves.

Said third axes may be upwardly outwardly or inwardly inclined with respect to said first axis. In one instance, said third axes are not upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support.

Said third axes may be upwardly forwardly or rearwardly incline, with respect to said plane of rotation and said direction of rotation of the support. In one instance, said third axes are not upwardly outwardly or inwardly inclined with respect to said first axis.

If desired, said third axes may be both upwardly outwardly or inwardly inclined with respect to said first axis and upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate.

Indeed, in instances where said second axes and said third axes are present careful selection of inclinations which are upwardly outwardly or inwardly inclined with respect to said first axis and upwardly forwardly or 900306,c_Sdat.073,gleeon. 1,3 4 1 2 3 4 6 7 8 9 11 S 12 13 14 I f 16 I r 17 18 19 21 22 23 24 26 27 28 29 31 32 33 34 35 36 37 38 rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support can produce a particularly effective cutter which is substantially safe from stone damage.

It is particularly preferred that the inboard ends of the cutter blade assemblies be located at least substantially entirely above the lowermost surface of the support plate. Indeed, it is preferred that the inboard ends of the cutter blade assemblies be located about the uppermost surface of the support.

Similarly, it is preferred that the second axes be located above the uppermost surface of the support.

In an instance in which the inboard ends of the cutter blade assemblies and the second axes are located entirely about the uppermost surface of the support the cutter blade assemblys can pivot after striking a stone to be entirely above the uppermost surface of the support.

It is preferred that the support plate is in the form of a disc.

The disc may be flat or dished as desired.

A specific construction of a cutter in accordance with this invention will now be described with the aid of the accompanying drawings in which:- Fig. 1 is a top plan view of the cutter in accordance with this invention, Fig. 2 is a cross-sectional view on line 2-2 in Fig. i, and Fig. 3 is a cross-sectional view on line 3-3 in Fig. i.

The cutter shown in Figs. 1 3 comprises a flat metal disc 1 having a central drive hole 2 and mounting holes 3 by means of which it may be mounted to a drive spindle for rotation about a vertical axis with the plane of rotation of the disc I being horizontal.

Mounting brackets 4 are secured to the disc 1 and support first pivot pins 6. The first pivot pins 6 carry linkage arms 7 which are secured to the first pivot pins 6 by retaining clips (not shown) which are entered into holes (not shown) in the first pivot pins 6.

900108,csdat.069,gleeson.1,4

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5 1 2 3 4 6 7 8 9 11 S, 12 4. 13 14 9 16 17 18 19 21 22 23 24 The linkage arms carry second pivot pins 22 which in turn carry cutter blades 23 having sharpened edges 24.

The orientation of the first pivot pins as shown in Fig. 2 and 3 is to be observed.

Referring to Fig. 2, projections of the axes of the first pivot pins 6 would intersect a projection of the axes of rotation of the disc 1 at about 10-30' with about being most preferred.

Referring to Fig. 3, of the axes of the pins 6 do not intersect the axis of rotation (44 in Fig. 3) and instead the pins 6 are inclined upwardly and forwardly with respect to the direction of rotation by from 2-10' with about being most preferred.

In use, if one of the cutter blades 23 hits a stone it will pivot about at least the respective one of the pivot pins 6 and in so doing will rise to be about the bottom of the disc 1.

Since modifications within the spirit and scope of the invention may be readily effected by persons skilled in the art, it is to be understood that the invention is not limited to the particular embodiment described, by way of example, hereinabove.

The claims form part of the disclosure of this specification.

26 0 27 28 29 31 32 33 34 36 37 338 900108,csdat.069,gleeson.1,5

Claims

4- 1. A grass, hay or like cutter adapted to be rotated in a direction in a plane of rotation about a first vertical axis and comprising a support plate, a number of cutter blade assemblies mounted to the support plate above the support plate to pivot about respective second axes and wherein the cutter blade assemblies comprise a cutter blade and a linkage; wherein the cutter blade is mounted to the linkage to pivot about a respective third axis and the linkage is connected to the support plate to pivot about the respective second axis and wherein said second axes are oriented such that in use on one of the cutter blade assemblies striking a stone or other hard object that cutter blade assembly will tend to pivot about the respective one of said second axes and at the normally outboard end of the cutter assembly will rise with respect to the support plate and the cutter blade assembly will locate in board of the periphery of the support plate and above the support plate where from the cutter blade assembly may return to a condition in which the linkage and the cutter blade extend generally radially outwardly of the vertical first axis under the influence of centrifugal force. 2. A grass, hay or like cutter as claimed in claim 1, wherein said second axes are upwardly outwardly or inwardly inclined with respect to said first axis. 3. A grass, hay or like cutter as claimed in claim 2, wherein said second axes are not upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate. 4. A grass, hay or like cutter as claimed in claim i, wherein said second axes are upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate.
900306.c adat.073, gleeon.1,6 9 1-- C I i- L i i l i I- l^ -15~-r -rrr- -rr~r r-.n ,rr- rri-alr -i -;rrxi-i I -r ~cr~a t *i I 7 A grass, hay or like cutter as claimed in claim 4, wherein said second axes are not upwardly outwardly or inwardly inclined with respect to said first axis. 6. A grass, hay or like cutter as claimed in claim 1, wherein said second axes are both upwardly outwardly or inwardly inclined with respect to said first axis and upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate. 7. A grass, hay or like cutter as claimed in any preceding claim, wherein said third axes are upwardly outwardly or inwardly inclined with respect to said first axis. 8. A grass, hay or like cutter as claimed in any one of claims 1-6, where said third axes are upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate. 9. A grass, hay or like cutter as claimed in any one of claims 1-6, wherein said third axes are both upwardly outwardly or inwardly inclined with respect to said first axis and upwardly forwardly or rearwardly inclined with respect to said plane of rotation and said direction of rotation of the support plate. 4. 16 17 18 19 21 22 23 24 26 27 *0 900108,csdat.069,g1eeaon.1. 7 ;il 8 1 10. A grass, hay or like cutter substantially as 2 hereinbefore described with reference to any one of the 3 accompanying drawings. 4 6 7 DATED THIS 8th January, 1990 8 ALISTAIR EDMOND STANLEY GLEESON 9 By his Patent Attorneys DAVIES COLLISON 11 T 12 13 S 14 S 16 17 18 19 21 22 23 24 26 a..a a 27 28 29 31 32 33 34 36 37 38 f; I' .i -I 1 i' ari iZ 900108,csdat.069,gleeson.1,8