GB2028243A - Means for removing rope tackle and the like from a rotating shaft - Google Patents
Means for removing rope tackle and the like from a rotating shaft Download PDFInfo
- Publication number
- GB2028243A GB2028243A GB7929069A GB7929069A GB2028243A GB 2028243 A GB2028243 A GB 2028243A GB 7929069 A GB7929069 A GB 7929069A GB 7929069 A GB7929069 A GB 7929069A GB 2028243 A GB2028243 A GB 2028243A
- Authority
- GB
- United Kingdom
- Prior art keywords
- propeller
- rope
- knives
- shaft
- knife
- 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.)
- Granted
Links
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Emergency Lowering Means (AREA)
- Food-Manufacturing Devices (AREA)
- Cleaning In General (AREA)
- Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
- Ropes Or Cables (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Mechanical Means For Catching Fish (AREA)
Abstract
The invention relates to a means for removing rope tackle and the like which has been wound around a rotating shaft, such as a propeller. In order to remove the rope tackle or the like, knives are mounted on a stationary shaft casing (6) on the propeller shaft, with the knife edges directed axially outwards. <IMAGE>
Description
SPECIFICATION
A means for removing rope tackle and the like from a rotating shaft
The invention relates to a means for removing rope tackle and the like which has become wound around a rotating shaft, especialiy a propeller shaft.
Awell known problem in connection with smaller boats, such as fishing vessels and the like, is that rope tackle and similar gear, drifting in the sea, can become wound around the propeller shaft and impede propulsion. Such problems have become steadily worse after nylon and other artificial fibers began to be used for fishing gear. Ropes of nylon and other artificial fibers are very strong, and most types also have a certain buoyancy, such that they float on or near the surface of the water and can become wound around the propeller shaft and the rudder post, which can cause great damage. In addition, it frequently happens that a fishing net or the like, when being dragged and set, comes into the propeller.
In the worst case, this can mean that the boat has to go into dock, or that the help of a diver is required to remove the rope. In all instances, the lashing of the rope around the propeller shaft results in a stoppage of operations.
Material which becomes wound around a rotating shaft can also cause problems on other types of equipment, for example, on lawn mowers.
The purpose of the present invention, therefore, is to provide a means by which this type of coiling around shafts can be avoided. In particular, the invention seeks to provide a means which will cut through any rope tackle and gear which interferes with the propeller on a boat, such that an operating stop will be avoided. The means prevents rope tackle and the like from interfering with or lashing onto the propeller casing, which would eventually stop the engine.
This is obtained by means of an arrangement whose characteristic features are disclosed in the appurtenant patent claims.
The means of the invention is adapted to be mounted on a propeller shaft, and comprises knives mounted upstream of the propeller, said knives having a cutting edge which cuts the rope with the aid of the pulling power of the propeller, the rope becoming tightened around the knives and thus being cut through.
The invention will be explained in greater detail in the following with reference to an embodiment example, which is illustrated on the accompanying drawings, where
Figure 1 is a perspective drawing of a knife for cutting rope tackle on the means provided in accordance with the invention, and
Figure 2 is a schematic side view of the means of the invention installed on a propeller shaft.
The means of the invention consists preferably of four knives which are mounted on a stationary casing which is provided on a propeller shaft, the knives being arranged such that their cutting edges are directed axially outwards. Such a knife is shown in Figure 1. The knife 1 is formed with a pointed tip 2 which points towards the propeller. At the pointed end, the knife is formed with an upwardly sloping or rising edge 3, with a slightly downwardly sloping section 4 in back of the edge 3, and a short rising section 5 in back of the section 4. To the rear of said rising portion 5 is the knife body itself, which has no cutting edge. These knives are mounted as shown on Figure 2.Four such knives are welded an equal distance apart, i.e., at an angular distance of 90" relative to one another, onto a metal casing 6 which is mounted so as to be stationary on the propeller shaft. The knives cover the space between the shaft mounting and the head of the propeller, as shown on the drawing. Each knife is mounted such that the tip 2 of the cutting edge projects beyond the casing toward the propeller 7, ending in the vicinity of the propeller blades 8. With a variabie pitch propeller, this will correspond to the innermost position of the propeller blades. The knives are mounted at an angle of 12 - 15" in relation to the longitudinal direction of the vessel, with the knife tips toward the normal direction of rotation of the propeller.
If rope tackle comes into the space between the hull of the ship and the propeller head, it will wind around the knives, and as the rope is pulled tighter owing to the rotation of the propeller, it will be pressed against the edges of the knives, tightening around them until the rope is cut through. The rope tackle might first, for example, encounter the sloping portion 3, and as it tightens, slide along the edge toward the flatter section 4, finally coming into the corner against the steeper section 5, where it becomes very tightly drawn and will be cut through.
The mounting of such knives on the propeller shaft thus ensures, in a simple manner, that undesired rope tackle around the propeller will be cut through, such that the problem of rope in the propeller is solved without entailing any interruption of normal operations or, in the worst case, having to dock the boat.
1. A means for removing rope tackle and the like which has become wound around a rotating shaft, especially a propeller shaft, characterised by knives (1 ) which are mounted on a stationary shaft casing (6) on the propeller shaft, with the knife edge directed axially outwards.
2. A means according to claim 1, characterised in that the knives (1) are mounted at angular distance of 90" relative to one another around the casing.
3. A means according to claim 1, characterised in that the knives are mounted at an angle of about 12" 15 in relation to the axis of the shaft.
4. A means according to claim 1, for use on a propeller shaft for a propeller with variable-pitch blades, characterised in that the knife edge is formed with a tip (2) which, at least when the propeller blades are in a rotating position, lies near the propeller blades.
5. A means according to claim 1, characterised in that the knife edge has a rising section (3) extending rearwardly of the tip (2) followed by a flatter section
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A means for removing rope tackle and the like which has become wound around a rotating shaft, especially a propeller shaft, characterised by knives (1 ) which are mounted on a stationary shaft casing (6) on the propeller shaft, with the knife edge directed axially outwards.
2. A means according to claim 1, characterised in that the knives (1) are mounted at angular distance of 90" relative to one another around the casing.
3. A means according to claim 1, characterised in that the knives are mounted at an angle of about 12" 15 in relation to the axis of the shaft.
4. A means according to claim 1, for use on a propeller shaft for a propeller with variable-pitch blades, characterised in that the knife edge is formed with a tip (2) which, at least when the propeller blades are in a rotating position, lies near the propeller blades.
5. A means according to claim 1, characterised in that the knife edge has a rising section (3) extending rearwardly of the tip (2) followed by a flatter section (4), which terminates in a short rising section (5).
6. A means for removing a rope from around a rotating shaft comprising a knife mounted on a casing, which casing is adapted to be mounted non-rotatably on the shaft with the knife edge directed radially outwardly with respect to the longitudinal axis of the shaft.
7. A means for removing a rope from around a rotating shaft substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO782857A NO141983C (en) | 1978-08-22 | 1978-08-22 | DEVICE FOR REMOVAL OF ROPE AND LIKE FROM A ROTATING SHAFT |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2028243A true GB2028243A (en) | 1980-03-05 |
GB2028243B GB2028243B (en) | 1983-03-02 |
Family
ID=19884379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7929069A Expired GB2028243B (en) | 1978-08-22 | 1979-08-21 | Means for removing rope tackle and the like from a rotating shaft |
Country Status (5)
Country | Link |
---|---|
DK (1) | DK149427C (en) |
GB (1) | GB2028243B (en) |
IS (1) | IS1219B6 (en) |
NO (1) | NO141983C (en) |
SE (1) | SE443758B (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4722667A (en) * | 1986-04-15 | 1988-02-02 | Sea-Land Corporation | Rope and fish net guard |
WO2002014146A1 (en) * | 2000-08-10 | 2002-02-21 | Environmental Separation Technologies Pty Ltd | A cutter for debris removal from a propeller |
WO2004048194A1 (en) * | 2002-11-22 | 2004-06-10 | Environmental Separation Technologies Pty Ltd | Cutting apparatus for removing debris from a propeller |
US6922982B1 (en) * | 2002-07-05 | 2005-08-02 | Daniel Smith | Marine weedwaker |
US7008277B2 (en) | 2000-08-10 | 2006-03-07 | Environmental Separation Technologies Pty. Ltd. | Cutting apparatus |
AU2001277421B2 (en) * | 2000-08-10 | 2006-06-29 | Environmental Separation Technologies Pty Ltd | A cutter for debris removal from a propeller |
CN109178275A (en) * | 2018-11-02 | 2019-01-11 | 东台市海船用设备有限公司 | A kind of transmission shaft structure with cutter |
-
1978
- 1978-08-22 NO NO782857A patent/NO141983C/en unknown
-
1979
- 1979-08-17 IS IS2507A patent/IS1219B6/en unknown
- 1979-08-21 DK DK349179A patent/DK149427C/en not_active IP Right Cessation
- 1979-08-21 SE SE7906984A patent/SE443758B/en not_active IP Right Cessation
- 1979-08-21 GB GB7929069A patent/GB2028243B/en not_active Expired
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4722667A (en) * | 1986-04-15 | 1988-02-02 | Sea-Land Corporation | Rope and fish net guard |
WO2002014146A1 (en) * | 2000-08-10 | 2002-02-21 | Environmental Separation Technologies Pty Ltd | A cutter for debris removal from a propeller |
EP1309481A1 (en) * | 2000-08-10 | 2003-05-14 | Environmental Separation Technologies Pty Ltd. | A cutter for debris removal from a propeller |
US7008277B2 (en) | 2000-08-10 | 2006-03-07 | Environmental Separation Technologies Pty. Ltd. | Cutting apparatus |
AU2001277421B2 (en) * | 2000-08-10 | 2006-06-29 | Environmental Separation Technologies Pty Ltd | A cutter for debris removal from a propeller |
EP1309481A4 (en) * | 2000-08-10 | 2006-10-18 | Environmental Separation Techn | A cutter for debris removal from a propeller |
US7425162B2 (en) | 2000-08-10 | 2008-09-16 | Environmental Separation Technologies Pty Ltd | Cutting apparatus |
US6922982B1 (en) * | 2002-07-05 | 2005-08-02 | Daniel Smith | Marine weedwaker |
WO2004048194A1 (en) * | 2002-11-22 | 2004-06-10 | Environmental Separation Technologies Pty Ltd | Cutting apparatus for removing debris from a propeller |
CN109178275A (en) * | 2018-11-02 | 2019-01-11 | 东台市海船用设备有限公司 | A kind of transmission shaft structure with cutter |
Also Published As
Publication number | Publication date |
---|---|
DK349179A (en) | 1980-02-23 |
SE7906984L (en) | 1980-02-23 |
NO782857L (en) | 1980-02-25 |
NO141983C (en) | 1985-07-09 |
GB2028243B (en) | 1983-03-02 |
IS1219B6 (en) | 1986-06-30 |
SE443758B (en) | 1986-03-10 |
DK149427B (en) | 1986-06-09 |
NO141983B (en) | 1980-03-03 |
DK149427C (en) | 1986-11-17 |
IS2507A7 (en) | 1980-02-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930821 |