EP1309481B1 - Couteau d'elimination de debris a partir d'une helice - Google Patents

Couteau d'elimination de debris a partir d'une helice Download PDF

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Publication number
EP1309481B1
EP1309481B1 EP01955153A EP01955153A EP1309481B1 EP 1309481 B1 EP1309481 B1 EP 1309481B1 EP 01955153 A EP01955153 A EP 01955153A EP 01955153 A EP01955153 A EP 01955153A EP 1309481 B1 EP1309481 B1 EP 1309481B1
Authority
EP
European Patent Office
Prior art keywords
spool
cutter
cutting edge
debris
cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01955153A
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German (de)
English (en)
Other versions
EP1309481A4 (fr
EP1309481A1 (fr
Inventor
Richard Caulfield
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Environmental Separation Technologies Pty Ltd
Original Assignee
Environmental Separation Technologies Pty Ltd
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Publication date
Application filed by Environmental Separation Technologies Pty Ltd filed Critical Environmental Separation Technologies Pty Ltd
Publication of EP1309481A1 publication Critical patent/EP1309481A1/fr
Publication of EP1309481A4 publication Critical patent/EP1309481A4/fr
Application granted granted Critical
Publication of EP1309481B1 publication Critical patent/EP1309481B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens
    • B63H5/165—Propeller guards, line cutters or other means for protecting propellers or rudders

Definitions

  • the present invention relates to a cutter for cutting debris from a propeller.
  • a propeller In particular, a marine vessel propeller.
  • Marine vessels, and in particular fishing vessels and crayfish boats often travel in water that contains rope and long-line fishing line.
  • 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.
  • the debris 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.
  • GB 522 862 discloses a device to prevent a rope or the like from becoming entangled around a propeller shaft, wherein a collar is provided around the periphery of a rotating shaft, having perforated “teeth” configured to "saw” and sever an entanglement that engages the teeth.
  • US 4,722,667 discloses a cutting ring for cutting from a marine propeller.
  • the present invention seeks to provide a new cutter that is more effective in cutting debris from the propeller.
  • the present invention is defined by the features of the claims.
  • 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 10.
  • a pair of cutters 10 and 10' are fixed to and laterally project from either side of the carrier 12.
  • 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/AU01/00632 .
  • channels 30 are provided in the pump to allow liquid through lubricating 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.
  • 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'.
  • 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.
  • 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.
  • a surface 70 of the mounting portion 20 is shown.
  • a short leg 72 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.
  • a slot 74 At the end 44 there is a slot 74. Leading inwardly from the slot 74 is the threaded hole 52.
  • 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.
  • 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 80 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.
  • the clearance between the base 83 of the bladed portion 22 and the spool 24, as indicated by 54, is very small to negligible.
  • 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.
  • 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 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 90° in relation to the outer surface of the bladed portion 22 and
  • Figure 13 shows the notch being curved.
  • 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.
  • 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 the threaded 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.
  • 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.
  • cutting edges 46', 76' and 45' performs the same function as cutting edges 46, 76 and 45, respectively.
  • 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 spool 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Harvester Elements (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (15)

  1. Appareil tranchant destiné à couper des débris à partir d'une hélice, l'appareil tranchant comprenant :
    un couteau (10) qui comprend un bord tranchant (46) ;
    caractérisé en ce que l'appareil tranchant comprend en outre :
    un tambour (24) qui présente un trou central qui le traverse, le tambour étant adapté de façon à pouvoir être fixé sur un arbre porte-hélice (16) qui passe, en service, à travers le trou, ou sur une hélice (18) couplée à un arbre porte-hélice qui passe, en service, à travers le trou, de façon à faire tourner, en service, le tambour avec l'arbre porte-hélice autour de l'axe de rotation du tambour ;
    dans lequel le tambour est agencé de façon à accumuler des enroulements de débris (58) sur une surface extérieure du tambour lorsque le tambour tourne, en service, autour de l'axe de rotation ; et,
    dans lequel le couteau peut être fixé, en service, dans une position par rapport à l'arbre porte-hélice et le bord tranchant est agencé de telle sorte que le bord tranchant soit orienté, lorsque le couteau est fixé en position, sensiblement transversal par rapport à l'axe de rotation du tambour, et le bord tranchant est agencé de façon à racler, en rotation, les débris (60) qui sont en contact avec le corps tranchant suite à une accumulation de débris sur la surface extérieure du tambour.
  2. Appareil tranchant selon la revendication 1 , dans lequel, lorsque le bord tranchant est fixé en position, le bord tranchant est positionné entre les extrémités axiales du tambour et se situe adjacent à la surface extérieure du tambour et s'étend de manière radiale à partir de celui-ci.
  3. Appareil tranchant selon la revendication 1 ou la revendication 2, dans lequel appareil tranchant comprend en outre des moyens de montage agencés de façon à fixer le couteau en position, dans lequel la position du couteau par rapport aux moyens de montage peut être réglée de telle sorte que la hauteur du bord tranchant par rapport à le tambour puisse être réglée lorsque le couteau et le tambour sont installés pour leur utilisation.
  4. Appareil tranchant selon l'une quelconque des revendications 1 à 3, dans lequel le couteau comprend une pluralité de bords tranchants (46 et 46') chaque bord tranchant étant orienté de façon à racler à partir du tambour les débris accumulés lorsque le tambour tourne, en service, dans l'une des directions respectives de rotation autour de l'axe de rotation du tambour.
  5. Appareil tranchant selon l'une quelconque des revendications 1 à 4, dans lequel un plan qui coïncide avec une surface avant qui forme le bord tranchant est disposé sous un angle obtus par rapport à l'axe de rotation du tambour.
  6. Appareil tranchant selon l'une quelconque des revendications 1 à 5, dans lequel un plan qui coïncide avec une surface arrière (84) qui forme le bord tranchant est disposé sous un angle aigu par rapport à l'axe de rotation du tambour.
  7. Appareil tranchant selon l'une quelconque des revendications 1 à 6, et dans lequel le couteau comprend :
    un corps (20) qui peut être fixé par rapport au navire dans une orientation, de telle sorte que le corps soit agencé, lorsque le corps se trouve dans une orientation telle que la longueur du corps est sensiblement parallèle à l'arbre porte-hélice du navire, de façon à fixer le couteau en position ; et,
    le couteau comprend une lame qui fait saillie à partir du corps, dans lequel la lame comprend une surface avant et une surface arrière (84) disposée sous un angle aigu par rapport à la surface avant de façon à former le bord tranchant au niveau d'une ligne d'intersection des surfaces, dans lequel un plan contenu à l'intérieur de la lame et qui passe par le bord tranchant fait un angle obtus par rapport à la longueur du corps.
  8. Ensemble comprenant l'appareil tranchant selon l'une quelconque des revendications 1 à 7,
    dans lequel le tambour est fixée sur un arbre porte-hélice qui passe à travers le trou de façon à tourner avec l'arbre porte-hélice ; et,
    le couteau est fixé en position de telle sorte que le bord tranchant soit orienté sensiblement transversal par rapport à l'axe de rotation du tambour de façon à racler en rotation les débris qui sont en contact avec le bord tranchant suite à une accumulation de débris sur la surface extérieure du tambour.
  9. Ensemble comprenant l'appareil tranchant selon l'une quelconque des revendications 1 à 7,
    dans lequel le tambour est fixé sur une hélice couplée à un arbre porte-hélice qui passe à travers le trou de façon à tourner avec l'arbre porte-hélice ; et,
    le couteau est fixé en position de telle sorte que le bord tranchant soit orienté sensiblement transversal par rapport à l'axe de rotation du tambour de façon à racler en rotation les débris qui sont en contact avec le bord tranchant suite à une accumulation de débris sur la surface extérieure du tambour.
  10. Ensemble selon la revendication 8 ou la revendication 9, dans lequel le bord tranchant s'étend de manière radiale par rapport à le tambour.
  11. Ensemble selon l'une quelconque des revendications 8 à 10, dans lequel le couteau est agencé de façon à être positionné à proximité immédiate du tambour de façon à empêcher les débris de pénétrer dans un espace (54) situé entre le couteau et la surface extérieure du tambour.
  12. Ensemble selon l'une quelconque des revendications 8 à 11, dans lequel la hauteur du bord tranchant par rapport à le tambour peut être réglée.
  13. Ensemble selon la revendication 9, dans lequel le bord tranchant est orienté de façon à racler les débris accumulés sur le tambour dans une direction longitudinale par rapport à l'arbre porte-hélice et ceci à partir de l'hélice.
  14. Ensemble selon l'une quelconque des revendications 8 à 13, dans lequel le couteau est positionné par rapport à le tambour de façon à faciliter une accumulation longitudinale en quantité limitée de débris sur le tambour sans qu'ils soient raclés par le couteau, au-delà de quoi une accumulation longitudinale supplémentaire de débris provoque le raclage des débris par le couteau.
  15. Ensemble selon l'une quelconque des revendications 8 à 14, dans lequel le couteau est orienté de façon à racler une face axiale des débris accumulés sur le tambour.
EP01955153A 2000-08-10 2001-08-10 Couteau d'elimination de debris a partir d'une helice Expired - Lifetime EP1309481B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPQ9333A AUPQ933300A0 (en) 2000-08-10 2000-08-10 A cutter
AUPQ933300 2000-08-10
PCT/AU2001/000986 WO2002014146A1 (fr) 2000-08-10 2001-08-10 Couteau d'elimination de debris a partir d'une helice

Publications (3)

Publication Number Publication Date
EP1309481A1 EP1309481A1 (fr) 2003-05-14
EP1309481A4 EP1309481A4 (fr) 2006-10-18
EP1309481B1 true EP1309481B1 (fr) 2012-12-05

Family

ID=3823392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01955153A Expired - Lifetime EP1309481B1 (fr) 2000-08-10 2001-08-10 Couteau d'elimination de debris a partir d'une helice

Country Status (3)

Country Link
EP (1) EP1309481B1 (fr)
AU (1) AUPQ933300A0 (fr)
WO (1) WO2002014146A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104828229A (zh) * 2015-04-20 2015-08-12 舟山万达船舶设计有限公司 一种远洋渔船螺旋桨

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002952814A0 (en) * 2002-11-22 2002-12-05 Environmental Separation Technologies Pty Ltd Cutting Apparatus For Removing Debris From a Propeller
US7008277B2 (en) 2000-08-10 2006-03-07 Environmental Separation Technologies Pty. Ltd. Cutting apparatus

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1649657A (en) * 1925-04-24 1927-11-15 Blake Frederick John Means for preventing the fouling of ships' and like propeller shafts and propellers
US1813540A (en) * 1930-06-20 1931-07-07 Laska Jacob Weed cutter
GB522862A (en) 1938-04-06 1940-06-28 Thomas Harris Improvements in propeller shaft protector
NO141983C (no) * 1978-08-22 1985-07-09 Ingolf Bursvik Anordning for fjerning av tauverk og lignende fra en roterende aksel
US4722667A (en) * 1986-04-15 1988-02-02 Sea-Land Corporation Rope and fish net guard
US4801281A (en) * 1986-09-12 1989-01-31 Govan Donald T Line cutter for outboard, inboard/outboard, and trolling motors
US5052957A (en) * 1990-07-11 1991-10-01 Govan Donald T Support for line and weed cutter
FR2680495B3 (fr) * 1991-08-19 1993-07-23 Geron Jean Claude Coupe orin.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104828229A (zh) * 2015-04-20 2015-08-12 舟山万达船舶设计有限公司 一种远洋渔船螺旋桨
CN104828229B (zh) * 2015-04-20 2017-07-14 舟山万达船舶设计有限公司 一种远洋渔船螺旋桨

Also Published As

Publication number Publication date
WO2002014146A1 (fr) 2002-02-21
AUPQ933300A0 (en) 2000-08-31
EP1309481A4 (fr) 2006-10-18
EP1309481A1 (fr) 2003-05-14

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