Ships – Anchor – Sea anchor
Patent
1988-08-23
1990-11-13
Peters, Jr., Joseph F.
Ships
Anchor
Sea anchor
114294, B63B 2148
Patent
active
049694138
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a sea--or drag--anchor.
2. Prior Art
A sea anchor, drag anchor or drogue of the type described and illustrated in Australian Patent Application No. 21643/83 has a hollow body which can be towed behind a vessel by means of a hawser connected to attachment means at the leading end of the body. Ports in the body are normally closed by spring-loaded doors to which the attachment means are operatively connected so that when tension of the hawser reaches a predetermined level the doors are moved inwardly to open the ports and the effective drag of the device is thereupon substantially increased. The controlled restraint afforded by such a device has been found very effective in preventing broaching to and providing reliable emergency steering for a wide variety of vessels. However, the effectiveness of such a device is diminished when towed at the fairly high speed commonly attained by multi-hull vessels. These vessels tend to be unstable in winds at a substantial angle to the direction of movement and have a tendency in such conditions to pitch-pole across the axis of the beam.
SUMMARY OF THE PRESENT INVENTION
The present invention has been devised with the general object of providing a sea anchor or drogue which when towed by a multi-hull vessel in adverse weather conditions will be found to be effective in controlling its speed and contributing substantially to its stability.
With the foregoing and other objects in view, the invention resides broadly in a sea anchor or drogue of the type having a front section forwardly tapering to a nose with means for attachment to a towering hawser and with a hollow rearwardly tapering back section, wherein longitudinal open channels are formed in the front section and lead into the hollow back section, the channels preferably increasing in width from front to their rear entry to the back section and preferably increasing also in depth from front to back. The increase in depth may be brought about by inwardly deflected baffles in the channels. Other features of the invention will become apparent from the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that preferred embodiments of the invention may be readily understood and carried into practical effect, reference is now made to the accompanying drawings, wherein:
FIG. 1 is a side elevation of a sea anchor or drogue according to the invention,
FIG. 2 is a longitudinal sectional view of the device,
FIG. 3 is a front elevational view of the device,
FIG. 4 is a rear view of the device,
FIG. 5 is a cross-sectional view of the device taken along line 5--5 in FIG. 1,
FIG. 6 is a side elevation of a sea anchor or drogue according to an alternative embodiment of the invention,
FIG. 7 is a front elevation of the drogue shown in FIG. 6,
FIG. 8 is a rear elevation of the device of FIG. 6,
FIG. 9 is a cross-sectional view of the device taken along line 9--9 of FIG. 7, and
FIG. 10 is a side elevational view of a further embodiment of the invention .
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring initially to FIGS. 1 to 5 inclusive, the sea anchor or drogue includes a body 10 moulded of any suitable plastics material and including a generally coned front section 11 increasing in diameter to its rear where it joins a hollow or concave frusto-conical back section 12, tapering to its closed rear end 13.
A cylindrical core 14 disposed coaxially within the body 10 extends rearwards of the back section 12, where it is formed with four radiating stabilizing fins 15 in equally spaced arrangment. An axial chamber 16 is formed in the rear part of the core behind and within the body, and is closed by a removable plug 17. A series of small water passages 18 lead into the rear part of the chamber 16.
Four flow-through tubes 19 are provided within the body 10, radiating in equiangular disposition from the core 14, each having an elongated inlet 20 through the cone front section 11 of the body, and a reduced outlet 21 through the re
REFERENCES:
patent: 2491564 (1949-12-01), Iversen
patent: 2940411 (1960-06-01), Bartels et al.
patent: 3064613 (1962-11-01), Hubick
patent: 3310257 (1967-03-01), Price
patent: 3755836 (1973-09-01), Milazzo
patent: 4096818 (1978-06-01), Wameling
patent: 4562788 (1986-01-01), Abernethy
Peters Jr. Joseph F.
Swinehart Edwin L.
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