AU2001277421B2 - A cutter for debris removal from a propeller - Google Patents
A cutter for debris removal from a propeller Download PDFInfo
- Publication number
- AU2001277421B2 AU2001277421B2 AU2001277421A AU2001277421A AU2001277421B2 AU 2001277421 B2 AU2001277421 B2 AU 2001277421B2 AU 2001277421 A AU2001277421 A AU 2001277421A AU 2001277421 A AU2001277421 A AU 2001277421A AU 2001277421 B2 AU2001277421 B2 AU 2001277421B2
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- Australia
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- spool means
- propeller
- cutter
- debris
- cutting apparatus
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Description
WO 02/14146 PCT/AU01/00986 A Cutter for Debris Removal from a Propeller Field of the Invention The present invention relates to a cutter for cutting debris from a propeller. In particular, a marine vessel propeller.
Background of the Invention Marine vessels, and in particular fishing vessels and crayfish boats often travel in water that contains rope and long-line fishing line. When the vessel passes over the rope or fishing line it will often become snagged around the spinning blades of the propeller, which, due to the spinning action, causes the rope, fishing line or other debris to become wound around the propeller shaft. As the debris is wound in, it builds up between the propeller and a bearing through which the propeller shaft rotates. Friction caused by the build up of rope can be created to the point where the debris, being made of plastics, can often melt and fill lubricating grooves of the bearing. This can prevent the flow of lubricating fluid through the bearing, which can cause the bearing to seize. Pressure due to the build up of debris pulls the propeller away from the bearing, which can damage the drive train that rotates the propeller shaft.
Some attempts have been made to arrange blades close to the propeller to attempt to cut away rope and other debris. Some of these blades are arranged to project laterally of the bearing thus attempting to cut rope as it is wound in. Other blades are arranged to point into a gap between a boss (rear) of the propeller and the bearing. In some instances, the bearing has been filled with a free wheeling collar member that attempts to fill this gap.
The collar member is allowed to freely rotate about the propeller shaft so as to not block the lubricating grooves of the bearing. Sometimes the collar member includes holes that allow water to run therethrough.
Currently used blades have had limited success. However, they quite often result in a mass of tightly compacted debris that is beyond the reach of the blade and that can still cause damage.
Summary of the Present Invention The present invention seeks to provide a new cutter that is more effective in cutting debris from the propeller.
WO 02/14146 PCT/AU01/00986 2 According to the present invention there is provided a cutter for cutting debris from a propeller including: a spool means fixed to a propeller shaft so as to rotate with the propeller shaft; a blade oriented to cut the debris from the spool means; whereby in use, debris snagged by the propeller is wound onto the spool means, whereupon it is cut away by the blade.
Preferably, the spool means is disposed between the propeller and a bearing holding the propeller shaft.
Preferably, the blade has a cutting edge oriented to cut debris build up moving towards the bearing. Preferably, the blade is arranged to be closely positioned to the spool means so that the blade glides over a circumferential surface of the spool means. Preferably, the spool means is substantially cylindrical.
Preferably, the blade is one of a plurality of blades.
Preferably, the cutting edge is oriented to cut into debris accumulating or moving generally longitudinally of the propeller shaft towards the bearing.
Preferably, the position of the blade is adjustable. Preferably, the blade is attached to a carrier of the bearing. Preferably, the blade overlaps the spool means. Preferably, the blade overlaps a liquid outlet of the spool means. Preferably, the spool means is a centrifugal pump.
Preferably, the cutting edge is one of a plurality of cutting edges, each cutting edge oriented to cut debris for one of the respective directions of rotation of the propeller. Preferably, the blade faces the propeller.
Detailed Description of Preferred Embodiments In order to provide a better understanding of the present invention, a preferred embodiment will now be described in detail, by way of example only, with reference to the WO 02/14146 PCT/AU01/00986 -3accompanying drawings: Figure 1 is a cross-sectional side view of a propeller shaft housing carrying a preferred embodiment of a cutter in accordance with the present invention; Figure 2 is an upper perspective view of a pair of cutters fixed to a propeller shaft carrier; Figure 3 is a close-up view of the cutter in use cutting rope from the propeller; Figure 4 is a bottom plan view of a mounting portion of the cutter of Figure 1; Figure 5 is a side plan view of the mounting portion of Figure 4; Figure 6 is a top view of the mounting portion of the cutter of Figure 4; Figure 7 is a plan view of a blade portion of the cutter of Figure 1; Figure 8 is a side view of the blade portion of the cutter of Figure 7; Figure 9 is a cross-sectional side view of the blade portion of Figure 8; Figure 10 is a cross-sectional side view of the blade portion of Figure 7; Figure 11 is a rear view of the blade portion of Figure 7; Figure 12 is a cross-sectional side view of an alternative blade portion; and Figure 13 is a cross-sectional side view of an another blade portion.
Referring to Figure 1, there is shown a cutter 10 fixed to a carrier 12 for carrying a bearing 14. The carrier 12 is normally situated under the hull of a marine vessel by a mounting member 13. A propeller shaft 16 passes through the bearing 14 to rotate a propeller 18.
The cutter 10 includes a laterally mounting portion 20 and a blade portion 22. The blade portion 22 faces the propeller 18. A spool 24 is located between the bearing 14 and a boss 28 of the propeller 18. The blade portion 22 overlaps with the spool 24 so that debris is removed from an end of the bearing 14 closest to the propeller 18. The spool 24 is fixed to the propeller shaft 16 so that it rotates with the propeller 18. The cutter 10 is fixed to the carrier 12 so that it remains stationary. In use, the propeller 18 and the spool 24 rotate about the propeller shaft 16 and will therefore be moving relative to the cutter Referring to Figure 2, a pair of cutters 10 and 10' are fixed to and laterally project from either side of the carrier 12. In front of the bearing 14 and carrier 12 is a separator 34 as described in International Patent Application No. PCT/AU00/00248. The spool 24 may be a centrifugal pump as described in International Patent Application Nos. PCT/AUOI/00632.
In this case, channels 30 are provided in the pump to allow liquid through lubricating WO 02/14146 PCT/AU01/00986 4 grooves in the bearing 14 to exit via the channels 30 at outlets 32 for each channel 30. The blade portions 22 and 22' overlap with the outlets 32 to clear debris from the outlets 32.
The carrier 12 includes a plurality of threaded holes 50 which are positioned so as to align with holes 40 in each mounting portion 20. A threaded bolt passes the holes 40 and screws into the threaded holes 50 so as to secure the mounting portion 20 to the carrier 12.
As best seen in Figure 7, oppositely facing blade edges 76 and 76' are located at the outer most lateral edge 42 of the mounting portion 20. The cutting edges 76 and 76' run longitudinally along the edge 42.
The mounting portion 20 includes a threaded hole 52 at a rear end 44 (closest to the propeller). The threaded hole 52 is for receiving another bolt that secures the blade portion 22 to the mounting portion 20. A hole 48 passes through the blade portion 22 for a bolt to pass through. The blade portion 22 includes a pair of cutting edges 46 and 46' that face the propeller 18. The blade portion also has another pair of cutting edges 45 and 45' that are parallel with the cutting edges 76 and 76'.
Referring to Figure 3, debris in this case rope 58, is shown snagged around the propeller 18, which has then been wrapped around the rear end of the propeller and then around the spool 24 due to the rotation of the propeller shaft 16. It can be seen that as the propeller shaft 16 continues to rotate the rope will build up in a direction moving away from the propeller 18, towards the bearing 14. As it moves closer to the bearing 14 it will eventually make contact with the cutting edges 46 or 46' of the blade portion 22. This results in the rope being shaved off, as indicated by strand 60. The more it builds up, the more it moves towards the blade and is cut away. Eventually the shaving of the rope will progress all the way through the width of the rope, or more likely, will cause the rope to be sufficiently weakened that it breaks.
If the marine vessel is travelling in reverse and the propeller shaft 16 will rotate in the opposite direction. The cutting edge 46' will be facing in a direction to cut debris from the spool 24 in the same manner as the cutting edge 46.
WO 02/14146 PCT/AU01/00986 5 Referring to Figures 4, 5 and 6, a surface 70 of the mounting portion 20 is shown. At each corner of the bottom surface 70 is a short leg 72. The legs 72 are provided so that a curve of the carrier 12 can be accommodated along the length of the bottom surface 70 and the mounting portion 20 secured firmly to the carrier 12. At the end 44 there is a slot 74.
Leading inwardly from the slot 74 is the threaded hole 52.
Referring to Figure 7, the lateral edge 42 of the mounting portion 20 is shown with the upper cutting edge 76 and the lower cutting edge 76'. These cutting edges will remove where debris being wrapping around not only the propeller 18 but the entire carrier 12.
Referring to Figures 8, 9, 10 and 11, the blade portion 22 has a lower projection 80 that is received within the slot 74 of the mounting portion 20. This allows the blade portion 22 to slide within the slot 74 laterally with respect to the propeller shaft 16. The projection includes a notch 82 at the base 83, which slides over the circumferential surface of the spool 24. An elongated hole 48 allows the bladed portion 22 to move while the bolt for securing the bladed portion 22 to the mounting portion 20 is in place, but not tightened.
This movement allows the bladed portion 22 to be adjusted in its height from the spool 24.
The bladed portion 22 is adjusted so that the base 83 almost touches or lightly touches the spool 24. The bolt is tightened to secure it in position. The bladed portion 22 then glides over the surface of the spool 24.
Referring back to Figure 2, the clearance between the base 83 of the bladed portion 22 and the spool 24, as indicated by 54, is very small to negligible. In the drawing, the two appear to be touching. In practice, they may be just touching and after a few revolutions of the spool 24 the bladed portion 22 will become properly seated so that the moving surface of the spool 24 glides underneath the relatively stationary undersurface of the bladed portion 22. The gap between the two is required to be very narrow so that debris does not enter the gap 54 between the two. Yet, the gap must be sufficiently wide so that the two surfaces may glide in relation to each other. It is undesirable for the bladed portion 22 to gouge into the spool 24.
Referring to Figures 10, 12 and 13, the cutting edge 46 is formed by an acute angle between an outer surface and a notch 86. Figure 10 shows an inner edge of the notch being WO 02/14146 PCT/AU01/00986 6 perpendicular to the outer edge of the bladed portion 22. Figure 12 shows the inner edge of the notch being at an angle greater than 900 in relation to the outer surface of the bladed portion 22 and Figure 13 shows the notch being curved.
The method of use and operation of the present invention will now be described with reference to the accompanying drawings.
A cylindrical spool 24 is fixed to the propeller shaft so that it rotates with the propeller shaft. The diameter of the spool should be approximately the same as the outer diameter of the carrier 12.
The mounting portion 22 of each cutter 10 is mounted to a carrier 12 by positioning the feet 72 on either end of the curved outer surface of the carrier 12 and aligning holes 40 with thethreaded holes 50 in the carrier 12. Bolts are then screwed into position to securely attach each of the mounting portions 20 to the carrier 12. The projection 80 of the bladed portion 22 is. inserted into the slot 74 and then positioned so that the base 83 of the bladed portion is almost or just touching the spool 24.
The position of the bladed portion 22 is then adjusted so that it nearly or just makes contact with the circumferential surface of the spool 24. A bolt is then inserted into the elongate hole 48 and threaded hole 52 and tightened to secure the bladed portion in position.
If any debris, such as rope, fishing line or other material becomes tangled with the propeller it will wrap around the spool 24 and continually tighten. As it becomes further entangled the debris will move towards the bearing where it will engage with the cutting edge 46 and be sliced away. The tighter the ravelling of the rope becomes, the more grip the spool has on the rope and the faster it is wound in and subsequently moves toward the blade. If the rope is then severed, any remaining rope within the reach of the bladed portion will continue to be sliced. Any other rope remaining there will be relatively harmless. If any further rope becomes entangled it will then cause either the first rope or the new rope to again move towards the bladed portion whereupon it will again be cut away. Any other rope that becomes tangled with the carrier will be caught by cutting edges 76 and 76' of the carrier portion 20 or cutting edge 45 of the bladed portion 12.
I
7 If the vessel needs to reverse and the propeller shaft is rotated in the opposite direction, cutting edges 46', 76' and 45' performs the same function as cutting edges 46, 76 and respectively.
The skilled addressee will appreciate that the present invention has the advantage of keeping tangled debris including rope and long fishing line away from the bearing and the lubricating fluid outlet of the bearing. The more rope that becomes tangled the faster it will move towards the cutting edge whereupon it will be cut away.
The preferred embodiment of the invention has an adjustable bladed portion that can be adapted to fix to a variety of sizes of a spool, the pool may be a centrifugal pump for pumping lubricating fluid through the bearing. The mounting portion is able to be mounted to a variety of shapes of carrier.
Modifications and variations can be made to the present invention without departing from the basic inventive concept. Such modifications include: The number of cutters that may be mounted to a carrier; (ii) The spool need not be a centrifugal pump as described in the preferred embodiment; and (iii) The angle of the cutting edges need not be as shown in the preferred embodiment.
Such modifications and variations are deemed to be within in the scope of present invention, the nature of which is to be determined from the foregoing description.
In the claims of this application and in the description of the invention, except where the context requires otherwise due to express language or necessary implication, the words "comprise" or variations such as "comprises" or "comprising" are used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
H:\emilyw\keep\retype\P 48443 pg 7.doc 15/03/06
Claims (43)
1. A cutting apparatus for cutting debris from a propeller comprising: a spool means fixed to a propeller shaft so as to rotate with the propeller shaft and the propeller, wherein the spool means is arranged to accumulate debris on an outer surface of the spool means as the propeller shaft rotates in use; and a cutter oriented to cut debris that accumulates on the spool means.
2. A cutting apparatus according to claim 1, wherein the spool means is disposed between the propeller and a bearing holding the propeller shaft.
3. A cutting apparatus according to claim 2, wherein the spool means is arranged to abut the propeller.
4. A cutting apparatus according to any one of claims 1 to 3, wherein the cutter comprises a cutting edge extending radially in relation to the spool means.
A cutting apparatus according to claim 4, wherein the cutting edge is oriented to cut build up of debris accumulating on the spool means and moving in a direction that is away from the propeller and towards the cutting edge.
6. A cutting apparatus according to either claim 4 or 5, wherein the cutting edge is positioned between axial ends of the spool means.
7. A cutting apparatus according to any one of claims 1 to 6, wherein the cutter is arranged to be closely positioned to the spool means so that the cutter glides over a circumferential surface of the spool means.
8. A cutting apparatus according to any one of claims 1 to 7, wherein the spool means is composed of a relatively soft material that wears in preference to the cutter. H:\emilyw\keep\retype\P 48443 Claims.doc 15/03/06 9
9. A cutting apparatus according to claim 4, wherein the outer surface of the spool means comprises a substantially cylindrical circumferential surface, wherein the circumferential surface is parallel with the axis of rotation of the propeller shaft.
10. A cutting apparatus according to claim 9, wherein the cutting edge is coupled to a body of the cutter, which is arranged to be parallel with the circumferential surface of the spool means.
11. A cutting apparatus according to any one of claims 1 to 10, wherein the cutter is one of a plurality of cutters oriented to cut debris that accumulates on the spool means.
12. A cutting apparatus according to any one of claims 4 or 9, wherein the cutting edge is oriented to cut into debris accumulating or moving on the spool means generally in a direction having a component which is parallel to the axis of rotation of the propeller shaft and which is toward the cutter.
13. A cutting apparatus according to any one of claims 4, 9, or 12, wherein the position of the cutting edge along the length of the shaft is adjustable.
14. A cutting apparatus according to any one of claims 4, 9, or 12 to 13, wherein the height of the cutting edge relative to the spool means is adjustable.
A cutting apparatus according to claim 10, wherein the body of the cutter is attached to a bearing carrier.
16. A cutting apparatus according to any one of claims 1 to 15, wherein the spool means includes a centrifugal pump.
17. A cutting apparatus according to claim 16, wherein the cutter overlaps a liquid outlet of the spool means. H:\emilyw\keep\retype\P 4 8 443 Claims.doc 15/03/06 10 \O
18. A cutting apparatus according to claim 4, wherein the cutter comprises a plurality of cutting edges, each cutting edge oriented to cut debris accumulating Son the spool means as the propeller shaft rotates in one of the respective t directions of rotation.
19. A cutting apparatus according to any one of claims 1 to 18, wherein the cutting edge of the cutter is oriented to be transverse the length of the propeller shaft. CI
20. A cutting apparatus according to any one of claims 1 to 19, wherein the spool means comprises a sacrificially wearable element positioned between the cutter and the (7 propeller.
21. A cutting apparatus according to any one of claims 1 to 20, wherein the spool means is in the form of a disc located between a boss of the propeller and a bearing holding the propeller shaft.
22. A cutting apparatus according to any one of claims 4, 9, 12 to 14, wherein the cutting edge is positioned on a cutting head, wherein the distance between axial ends of the spool means is sufficient for the cutting head of the cutter to be wholly radially disposed over the spool means.
23. A cutting apparatus according to any one of claims 1 to 22, wherein the spool means is a single piece annulus.
24. A cutting apparatus according to any one of claims 1 to 23, wherein the spool means includes first and second axial ends and is configured to receive windings of debris that accumulate toward the first longitudinal end of the spool means as the propeller shaft rotates in use.
25. A cutting apparatus according to claim 24, wherein the cutter is securable proximate the first longitudinal end of the spool means and oriented to cut debris that accumulates on the spool means towards the first longitudinal end. H:\emilyw\keep\retype\P 4 8443 Claims.doc 15/03/06 I I I I I a \O 11-
26. A cutting apparatus according to any one of claims 1 to 25, wherein the cutter is positioned relative to the spool means such that a limited amount of debris can Saccumulate on the spool means without being cut by the cutter, beyond which further Saccumulation causes the debris to be cut away by the cutter.
27. A cutting apparatus according to any one of claims 4,9,12 to 14 or 22, wherein the cutting edge is arranged to be encountered by debris accumulating on the spool means as the accumulation of debris moves towards the cutter, such that the cutter cuts the accumulating debris by shaving away debris as it contacts the cutting edge.
28. A cutting apparatus according to any one of claims 1 to 27, wherein the cutter is arranged to be continuously closely positioned to the spool means so that debris is not readily able to enter a space between the cutter and a circumferential surface of the spool means.
29. A cutting apparatus according to claim 2, wherein the spool means has a diameter substantially the same as the width of a housing of the bearing.
A cutting apparatus according to any one of claims 1 to 29, wherein the cutter is oriented to cut into an axial face of the debris that accumulated on the spool means.
31. A cutting apparatus according to claim 30, wherein the axial face has a tangent transverse to the axis of rotation of the spool means.
32. A cutting apparatus according to any on eof claims 1 to 31, wherein the cutting is by a shaving action.
33. A cutting apparatus according to any one of claims 1 to 32, wherein the outer surface of the spool means is circular in a cross section perpendicular to the axis of rotation of the spool means. H:\emilyw\keep\retype\P48443 Claims.doc 15/03/06 XFPVIII- 12
34. A cutting apparatus according to claim 6, wherein the cutter is arranged relative to the spool means such that accumulation of debris on the part of the spool which is overlapped by the cutter is prevented, but accumulation of debris on the spool is permitted to a limited extent until it extends longitudinally over the spool means to the extent that it encounters the cutting edge of the cutter.
A cutting apparatus for cutting debris from a propeller comprising a cutter oriented to shave an axial face of debris rotating with the propeller, wherein the axial face has a tangent substantially perpendicular to the axis of rotation of the propeller.
36. A cutting apparatus for cutting debris from a propeller fixed to a propeller shaft, comprising: a cutter having a cutting edge oriented to cut the debris on rotating with the propeller, the cutting edge being positioned radially in relation to the propeller shaft.
37. A cutting apparatus according to claim 36, wherein the cutting edge is substantially perpendicular to the axis of rotation of the spool means.
38. A cutting apparatus for cutting debris from a propeller comprising: a spool means fixed to a propeller shaft or the propeller so as to rotate with the propeller shaft and the propeller, wherein the spool means is in the form of a disc located between a boss of the propeller and a bearing holding the propeller shaft; and a cutter oriented to cut the debris on the spool means, wherein the spool means is composed of a relatively soft material that wears in preference to the cutter.
39. An assembly comprising: a propeller having a boss and propeller blades; a propeller shaft on which the propeller is mounted; H:\emilyw\keep\retype\P48443 Claims.doc 15/03/06 I 13 a spool means located on the boss of the propeller between the propeller blades and the propeller shaftwherein the spool means is arranged to accumulate debris on an outer surface of the spool means as the propeller shaft rotates in use; and a cutter orientated to cut away debris that accumulates on an outer surface of the spool means.
A spool comprising an annulus shaped body having a substantially cylindrical outer surface arranged to accumulate windings of debris thereon upon rotation such that when debris accumulates on the cylindrical outer surface of the spool means, debris is cut away by a cutter oriented to cut that debris accumulated on the spool means.
41. A cutter for cutting debris snagged by a propeller comprising a cutting edge arranged to be oriented in use to cut debris that accumulates on a spool means fixed to a propeller shaft or the propeller so as to rotate with a propeller shaft and propeller, whereby in use debris snagged by the propeller is wound onto and accumulates on the spool means whereupon the accumulated debris is cut away by the cutting edge.
42. A cutter according to claim 41, wherein the cutting edge is oriented in use to be transverse the axis of rotation of the spool means.
43. A cutter substantially as hereinbefore described with reference to the accompanying drawings. Dated this 15th day of March 2006 ENVIRONMENTAL SEPARATION TECHNOLOGIES PTY LTD By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent and Trade Mark Attorneys of Australia H:\em±1yw\keep\retype\P48443 Claims.doc 15/03/06
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ9333 | 2000-08-10 | ||
AUPQ9333A AUPQ933300A0 (en) | 2000-08-10 | 2000-08-10 | A cutter |
AU7742101A AU7742101A (en) | 2000-08-10 | 2001-08-10 | A cutter for debris removal from a propeller |
PCT/AU2001/000986 WO2002014146A1 (en) | 2000-08-10 | 2001-08-10 | A cutter for debris removal from a propeller |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2001277421A1 AU2001277421A1 (en) | 2002-05-23 |
AU2001277421B2 true AU2001277421B2 (en) | 2006-06-29 |
Family
ID=25638616
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2001277421A Expired AU2001277421B2 (en) | 2000-08-10 | 2001-08-10 | A cutter for debris removal from a propeller |
AU7742101A Pending AU7742101A (en) | 2000-08-10 | 2001-08-10 | A cutter for debris removal from a propeller |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU7742101A Pending AU7742101A (en) | 2000-08-10 | 2001-08-10 | A cutter for debris removal from a propeller |
Country Status (1)
Country | Link |
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AU (2) | AU2001277421B2 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2028243A (en) * | 1978-08-22 | 1980-03-05 | Bursvik I | Means for removing rope tackle and the like from a rotating shaft |
US4722667A (en) * | 1986-04-15 | 1988-02-02 | Sea-Land Corporation | Rope and fish net guard |
US5807150A (en) * | 1997-04-14 | 1998-09-15 | Minter, Sr.; Charles F. | Blade system for marine motors |
-
2001
- 2001-08-10 AU AU2001277421A patent/AU2001277421B2/en not_active Expired
- 2001-08-10 AU AU7742101A patent/AU7742101A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2028243A (en) * | 1978-08-22 | 1980-03-05 | Bursvik I | Means for removing rope tackle and the like from a rotating shaft |
US4722667A (en) * | 1986-04-15 | 1988-02-02 | Sea-Land Corporation | Rope and fish net guard |
US5807150A (en) * | 1997-04-14 | 1998-09-15 | Minter, Sr.; Charles F. | Blade system for marine motors |
Also Published As
Publication number | Publication date |
---|---|
AU7742101A (en) | 2002-02-25 |
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Legal Events
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FGA | Letters patent sealed or granted (standard patent) | ||
MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |