Ships – Spars – Gaffs – booms – etc.
Patent
1985-09-19
1986-12-23
Blix, Trygve M.
Ships
Spars
Gaffs, booms, etc.
114 99, B63H 910
Patent
active
046305645
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a boom arrangement which is designed to be used on a boat which has a boom projecting out from a mast and designed to be connected to a sail, especially on a sailing boat.
The main object of the present invention is primarily to provide an arrangement of the above-mentioned kind which effectively and reliably prevents the boom from swinging around the mast too rapidly on occasions when this is not desired, and thus to reduce the risk of personal injury occasioned by the boom.
The said object is achieved by an arrangement according to the present invention, the characteristics of which may be found in the patent claims.
The invention is described in the following by way of an embodiment example, with reference to the accompanying drawings, on which
FIG. 1 shows a schematic side view of a sailing boat with the mast and boom appertaining thereto, with a boom arrangement according to the invention connected to the boom and held in an intermediate position with the boom brought into a plane extending in the longitudinal direction of the boat,
FIG. 2 is a schematic plan view of the sailing boat with the boom swung out into a maximum sailing position,
FIG. 3 is a schematic plan view of the boat with the arrangement held in a position in which it prevents the boom from swinging backwards too rapidly, and
FIG. 4 is a perspective view of a mast with the pivotable boom appertaining to it, with a boom arrangement designed according to the invention acting on the boom, and with a stern rope connected to the said boom arrangement.
On the drawings the sailing boat is designated with the numeral 1, while a mast and the boom appertaining thereto are designated with the mumerals 2 and 3 respectively. A boom arrangement 5 according to the invention is designed to extend between the boom 3 and the mast 2 or between the boom 3 and the deck 4 of the sailing boat 1, for example. As shown in the present embodiment, the said boom arrangement 5 may consist of a telescopic piston 5 which operates with a spring effect.
The piston 5 is turnably connected at one of its ends, 5A, to the mast 2 or the deck 4 via a mounting 6. The said mounting 6 may be supported on a bracket 7 extending out from the mast 2 so that the mounting 6 is located at a specific distance 8 from the mast 2 in the region behind a plane which extends transversely across the boat 1 through the mast 2.
The opposite end 5B of the piston is connected rotatably via a joint 9 to the boom 3, some way from the boom mounting 10 acting between the mast 2 and the boom 3, so that an angle 11 is formed between the arrangement 5 and the boom 3.
Optionally, a kick 12 is provided, disposed at a distance from the piston 5, and behind the latter, viewed in the longitudinal direction of the boat.
The boom arrangement 5 is constructed so that it strives to extend itself, i.e. so that it urges the boom 3 with a certain force in the direction away from the fixing point 6 on the mast 2 or the deck 4 for the arrangement, as shown with the arrow 13.
The arrangement 5 may consist of a pneumatic spring of a known kind or the like, or it may be designed to act by means of a mechanical spring element.
The arrangement 5 operates so that when the boat is being sailed with the wind direction 14 coinciding with the longitudinal direction 15 of the boat, straight from astern, i.e. what is known as running before the wind, as shown in FIG. 2, the arrangement 5 urges the boom 3 in the direction of the arrow 13 as shown in FIG. 2. If the wind veers suddenly and if the boat is being sailed in rough seas with large waves, for example, the boom 3 normally strives to swing rapidly around the mast 2 and the mounting 10, in over the boat deck 4. The crew and passengers thereby risk being hit by the boom on the head, resulting in serious injury. The arrangement 5 prevents the boom 3 from swinging round too rapidly on these occasions, as described above, and the crewman who is sometimes detailed to stand by the mast and prevent the said undesired swinging of the boom 3 may be p
REFERENCES:
patent: 3090340 (1963-05-01), McCutchen et al.
patent: 3310017 (1967-03-01), Dyer
patent: 3918037 (1975-11-01), Hall
patent: 4114551 (1978-09-01), Hall
patent: 4138962 (1979-02-01), Waelder
patent: 4367688 (1983-01-01), Godfrey
patent: 4406240 (1983-09-01), Andersen
Andren Kjell
Duckman Curt
Duckman Donald
Avila Stephen P.
Blix Trygve M.
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