Line hauling device

Abstract

A line hauling device such as a windlass is disclosed for marine craft. The device has a support, a drum held on the support and rotatable with respect to the support, a motor for selectably driving rotation of the drum in a forward (hauling) direction and a reverse (paying out) direction, and a line laying mechanism for laying the line onto the drum. The drum is adapted to store the line on the drum. When operated in the forward direction, the line-laying mechanism lays the line onto the drum in a first series of turns. On completion of the first series of turns the line-laying mechanism lays the line in a second series of turns overlying the first series of turns. The line-laying mechanism includes a carriage which is driven reciprocally with respect to the drum by rotation of the drum.

Claims

1. A line hauling device for marine craft, the device having: a support; a drum held on the support and rotatable with respect to the support; a motor for selectably driving rotation of the drum in a forward (hauling) direction and a reverse (paying out) direction; and a line laying mechanism for laying a line onto the drum, 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 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, wherein the line laying mechanism is operable to move a carriage guiding the line between the drum and a free end of the line, in which operation the carriage is moved reciprocally with respect to the drum, movement of the carriage being driven by rotation of the drum driving a gear wheel having a rotatable arm extending radially from the gear wheel, the rotatable arm having a boss at one end cooperating with a slot formed in a frame fixed with respect to the carriage, rotation of the rotatable arm thereby causing the boss to slide in the slot and drive reciprocating movement of the frame and the carriage.

2. A line hauling device according to claim 1 wherein the line hauling device is a windlass and the line is an anchor rode.

3. A line hauling device according to claim 1 wherein at least a third layer of turns of the line can be laid on the drum, overlying the second layer of turns.

4. A line hauling device according to claim 1 wherein the drum includes end walls radially extending away from an axis of rotation of the drum, the end walls being capable of containing the layers of turns of line on the drum.

5. A line hauling device according to claim 1, configured so that the drum stops paying out when it is determined that the number of turns of line remaining on the drum has reached a certain number.

6. A line hauling device according to claim 1 wherein the device includes a switch which is operable to prevent pay out operation of the motor when the load on the line is reduced below a threshold level.

7. A line hauling device according to claim 1 further including a cover.

8. A line hauling device according to claim 7 wherein the cover includes a window positioned to allow viewing of the drum and the line stored on the drum.

9. A line hauling device according to claim 7 wherein the cover includes a slot sized and located in order to allow the line to exit the device from any position on the drum.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the invention will now be described by way of example with reference to the accompanying drawings in which:

(2) FIG. 1 shows a perspective view of a windlass according to an embodiment of the invention, with the cover removed.

(3) FIG. 2 shows an enlarged view of a part of FIG. 1, marked in FIG. 1 with a dash-double-dot circle.

(4) FIG. 3 shows a side view of the embodiment of FIG. 1.

(5) FIG. 4 shows a sectional view along line V-V in FIG. 3.

(6) FIG. 5 shows an enlarged view of a part of FIG. 4, marked in FIG. 4 with a dash-double-dot circle.

(7) FIG. 6 shows a partial sectional view from below of the embodiment of FIG. 1.

(8) FIG. 7 shows an enlarged view of a part of FIG. 6, marked in FIG. 6 with a dash-double-dot circle.

(9) FIG. 8 shows a view from below of the embodiment of FIG. 1, with part of the base omitted.

(10) FIG. 9 shows an enlarged view of a part of FIG. 8, marked in FIG. 8 with a dash-double-dot circle.

(11) FIG. 10 shows a perspective view of a windlass according to another embodiment of the invention, including the cover removed.

(12) FIG. 11 shows an enlarged partial view of part of the embodiment of FIG. 10, with the cover removed.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS, AND FURTHER OPTIONAL FEATURES OF THE INVENTION

(13) 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.

(14) A first embodiment will be described with reference to FIGS. 1-9 in which the same reference numerals are used for the same features.

(15) 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 FIGS. 1-9).

(16) 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.

(17) 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.

(18) 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.

(19) 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.

(20) 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.

(21) 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 FIGS. 6-9. Boss 60 fits in corresponding slot 62 in the underside of frame 58. Rotation of arm 48 causes boss 60 to slide in slot 62 and so cause lateral movement of frame 58 and thus of carriage 50. The limit of travel of the carriage 50 is defined by the position of arm 48 as shown in the drawings and at 180 from this position. Thus, continuous rotation of arm 48 causes reciprocation of carriage 50. In turn, this causes the rode to be guided onto the drum 20 at a suitable axial position along the drum to form a neat winding of the rode onto the drum. A first layer of rode is therefore formed from a series of neatly wound turns on the drum, from end wall 30 to end wall 32 of the drum. When the first layer is complete, further rotation of the drum in the forwards direction causes the direction of travel of the carriage 50 to reverse, so that the rode is wound in a series of neat turns in a second layer, overlying the first layer. A third layer can be formed over the second layer and so on.

(22) 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.

(23) As shown in FIG. 1, sprung load-detecting device 56 takes the form of a wire spring 55 mounted with respect to carriage 50. The device has a portion 57 for bearing down on the rode to provide a mild frictional engagement with the upper surface of frame 58, as shown in FIG. 7.

(24) The function of the sprung load-detecting device is best explained with reference to FIG. 11. Here spring wire 55 is mounted with respect to the carriage so that it is urged towards the frame to deviate the rode and mildly press the rode to the upper surface of the frame of the carriage. A relatively small load on the free end of the rode is sufficient to lift the sprung load-detecting device. Lifting of the sprung load-detecting device operates a switch 59 to allow activation of the motor to drive rotation of the drum. This is beneficial particularly where the windlass is being operated to pay out the anchor rode. 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.

(25) 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.

(26) As shown in FIG. 10, the windlass has a housing 80 which covers the drum and the rode-laying mechanism. An integrated switch (not shown) is fitted to the rear of the housing. Alternatively, a remote control can be used to operate the windlass.

(27) As also shown in FIG. 10, the housing 80 includes a covered window 82, to allow the correct operation of the rode storage and pay out to be observed. The use of a cover limits the possibility of accidental trapping of fingers or clothing in the rode being wound on the drum. The housing includes a horizontal slot 84 of suitable extent to allow the rode to enter and exit the housing across the full extent of travel of the fairlead on the carriage.

(28) 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.