Patent Application
20150137054
This application is based on and claims priority under 35 USC 119 from Great Britain Patent Application No. 1320441.7, filed on Nov. 19, 2013, the entire content of which is incorporated herein by reference.
1. Field of the Invention
The present invention relates to a line hauling device, It is of particular interest for use on marine craft such as a sailboat or a powerboat typically used for leisure. The line hauling device may, for example, be a windlass, Alternatively, the line hauling device may be a winch.
2. Related Art
A form of windlass having a gypsy (in which a line and/or chain executes only a single turn between inward and outward runs) is commonly used on marine craft to haul and veer the anchor rode i.e. the line and/or chain. Since the combined weight of the anchor and chain can be relatively great, windlasses powered by electric or hydraulic motors are known. These typically haul the chain over the gypsy of the windlass and allow the anchor rode to fall under gravity into an anchor locker under the deck of the craft at the bow. One example of such a windlass is the Lewmar Pro-Series windlass, Part Number: 6657011198-311 (http://www.lewmar.com/products.asp?id=8329&lid=25799 accessed 18 Nov. 2013).
The present inventors have realised that the anchor rode storage used with known windlass systems, in which the anchor rode is stored in an anchor locker as described above, has several disadvantages. One such disadvantage is that the anchor locker takes up a significant volume of below-deck space on the craft, in view of the need to provide both a space for the accumulated anchor rode and a sufficient height for the anchor rode to fall into the anchor locker. Another disadvantage is the noisy accumulation of anchor rode in the anchor locker during hauling, particularly the chain part of the anchor rode.
It is known to provide some of the anchor rode in the form of rope, in view of weight and cost requirements. However, as will be readily understood, rope has different characteristics to chain. Rope stores differently in the anchor locker compared with chain, and is liable to become more easily tangled than chain in the anchor locker during anchor let out. It is desirable to use rope as a significant part of the anchor rode, in view of the developments in rope technology which have led to very high strength, low weight ropes.
The present invention has been devised in order to address at least one of the above problems. Preferably, the present invention reduces, ameliorates, avoids or overcomes at least one of the above problems.
Accordingly, in a first preferred aspect, the present invention provides a line hauling device for marine craft, the device having:
wherein the drum is adapted to store the line on the drum and wherein, in operation in the forward direction, the line-laying mechanism lays the line onto the winch drum in a first series of turns and on completion of the first series of turns, lays the line in a second series of turns overlying the first series of turns.
In a second preferred aspect, the present invention provides a method of operation of a line hauling device according to the first aspect to haul in or pay out a line.
The first and/or second aspect of the invention may have any one or, to the extent that they are compatible, any combination of the following optional features.
Preferably, the line hauling device is a windlass. Preferably, the line is an anchor rode.
It is preferred that a third layer of turns of the line can be laid on the winch drum, overlying the second layer of turns. Further layers of turns may be provided, dependent on the capacity of the drum and the required length of line to be stored on the drum.
Preferably, the drum includes end walls radially extending away from an axis of rotation of the drum. The end walls preferably operate to contain the layers of turns of line on the drum.
The line laying mechanism preferably operates to move a carriage guiding the line between the drum and a free end of the line. The carriage is preferably moved reciprocally with respect to the drum. Preferably, movement of the carriage is driven by rotation of the drum. This can be achieved for example by a gear train or by a timing belt arrangement. The carriage may be moved by a cooperation of a rotatable arm and a linear track. In this manner, rotation of the rotatable arm by 180° can correspond to laying one layer of turns of line fully across the width of the drum. Continuous rotation of the arm therefore preferably causes reciprocation of the carriage which in turn causes the line to be guided onto the drum at a suitable axial position along the drum to form a neat winding of the line onto the drum. A first Layer of line may therefore be formed from a series of neatly wound turns on the drum. When the first layer is complete, further rotation of the drum in the forwards direction preferably causes the direction of travel of the carriage to reverse, so that the line is wound in a series of neat turns in a second Layer, overlying the first layer.
Preferably, the windlass includes a cover. This can help with the safe operation of the windlass, by preventing the accidental trapping of fingers or clothing in the winding line on the drum. The cover may include a window positioned to allow viewing on the drum and the line stored on the drum. This allows the user to gauge the correct operation of the device and to see how much line is left on the drum. The cover preferably includes a slot sized and located in order to allow the line to exit the device from any position on the drum. Preferably the slot is a Laterally extending slot, extending is direction parallel to the direction of rotation of the drum.
The windlass is preferably configured so that the drum will stop paying out when it is determined that the number of turns of line remaining on the drum has reached a certain number. This allows the user the security that the line will remain firmly secured to the drum even when paying out a significant length of line.
Preferably, the device includes a switch which is operated to prevent pay out operation of the motor when the load on the line is reduced below a threshold level. This allows effective “drift” fishing to be performed. The switch is preferably a spring-loaded clamp which operates a switch as defined above when the load on the free end of the line is below a threshold level. When the load on the free end of the rope rises above the threshold level, preferably the load overcomes the spring Loading force and the switch is deactivated, allowing further operation of the motor to pay out further line.
Further optional features of the invention are set out below.
Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which:
The preferred embodiment of the invention is a captive reel windlass. It is intended for anchoring either a powerboat or sailboat up to about 28 feet long, referred to herein as a marine craft. It will be readily apparent to the skilled reader that the preferred embodiment described here can be scaled, up or down, to be suitable for use with larger or smaller vessels.
A first embodiment will be described with reference to
The windlass 10 includes a support plate 12 adapted to be fixed to the deck of the marine craft (not shown). The support plate is typically formed from stainless steel for corrosion resistance. Support plate 12 is formed in a shape including upstanding arms 14, 16. Arm 16 support motor 18. Arms 14 and 16 support drum 20 and allow rotation of drum via suitable bearings (not shown). Motor 18 drives rotation of drum 20 via a transmission (not shown) in the forward (hauling) direction and a reverse (paying out) direction, Support 12 also has mounting points 22, 24, 26 for the attachment of a cover (not shown in
A first end (not shown) of an anchor rode 28 is attached to drum 20. A second end (not shown) of the anchor rode is attached to an anchor, or to an anchor chain which is in turn attached to an anchor.
The drum 20 is in the form of a reel, having end walls 30, 32 of suitable radial extent to confine multiple layers of turns of the anchor rode on the drum.
Rotation of drum 20 drives gear 34 which in turn drives gear 36 mounted on side wall 14. Rotation of gear 36 drives gear 38 which is sized to rotate at the same speed as gear 34. In alternative embodiments, gear 36 can be replaced with a suitable arrangement of a toothed timing belt and guide between gears 34 and 38.
Gear 38 is attached to rotatable shaft 40, held for rotation between arms 14 and 16 of the support. A worm gear 42 is fixed to rotatable shaft 40 and engages with a horizontal gear wheel 44. Gear wheel 44 is rotatable about plate 46, which in turn is fixed to the support 12. Arm 48 is rotatable with gear wheel 44, rotation of the arm causing the mechanical effect described in more detail below.
A line laying mechanism is provided in the form of rode-laying carriage 50 which is translationally moveable along fixed shafts 52, 53, held between arms 14, 16 of the support 12. Carriage 50 includes a fairlead 54 to guide the rope lode 28 through the carriage to the drum 20 via a sprung load-detecting device 56 described in more detail below. Carriage 50 also includes frame 58 extending between shafts 52, 53.
Gearing 34, 36, 38, 42 and 44 is arranged so that gear wheel 44 rotates 180° in order to correspond to laying one layer of turns of rode fully across the width of drum 20. Arm 48, connected to gear wheel 44 at its proximal end, includes a boss 60 at its distal end, as best shown in
In this manner, the rode can be stored neatly on the drum in a series of layers, so that a very significant length of rode can be stored without the need for an anchor locker.
As shown in
The function of the sprung load-detecting device is best explained with reference to
The weight of the anchor and rode is sufficient to lift the sprung load-detecting device and allow rotation of the drum. However, once the anchor reaches the sea bed, the load is much reduced. This reduced load is counteracted by the spring tension in the sprung load-detecting device and the device engages the switch to prevent further pay out rotation of the drum. Thus, the rode is prevented from further paying out when the rode is slack.
The windlass also includes an auto-stop feature so that when paying out rode from the drum, when the final layer of rode is reached on the drum, the drum is prevented from further rotation when only a certain number of turns of rode remains on the drum. This is achieved based on the drum only being allowed a certain number of revolutions from maximum storage capacity towards full pay out. This allows the operator the security that a safe number of turns of rode will remain on the drum, for example when anchoring in deep water.
As shown in
As also shown in
While the invention has been described in conjunction with the exemplary embodiments described above, many equivalent modifications and variations will be apparent to those skilled in the art when given this disclosure. Accordingly, the exemplary embodiments of the invention set forth above are considered to be illustrative and not limiting. Various changes to the described embodiments may be made without departing from the spirit and scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1320441.7 | Nov 2013 | GB | national |
