JPH02286493A - Roller reef boom device - Google Patents

Abstract

PURPOSE: To smoothly wind a sail by providing a boom supported by the mast of a sailing boat with a winding member freely rotationally supported at its first end, and forming the member so that its diameter increases from the first end to a second end. CONSTITUTION: A main sail rigging 10 includes a mast 12, a boom 14, and a main sail 16, and the main sail 16 is connected to the boom 14 at its bottom and to the track 20 of the mast 12 at its vertical edge via a luff bead 18. In this case, the boom 14 is rotatably attached to the mast 12 and made to function as a winding member, with its rotation enabling the main sail 16 to be wound around it. The boom 14 is formed into a shape such that its diameter increases from an end 22 near the mast 12 to the opposite end 24, that is, a conical shape.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an improved roller reef boom arrangement for sailing vessels.

PRIOR ART The use of roller-reef boom devices to tension, release or shorten sailboat mainsails is well known, for example as described in British Patent No. 1.179.981, 70
3,709, 639,062, or U.S. Pat. No. 3,260.230, 3,608,511,
3,132°620.2,197,654.3,285
, 215.4, 324.192. Typically, a triangular-shaped mainsail is supported along its horizontal sides by a boom and its vertical sides by fixed tracks along the mast. The mast receives a bead that is sewn along the vertical edge of the sail. The track restrains and accommodates the bead and therefore the sides of the mainsail, allowing movement of the sail and bead in either direction relative to the track. /% A yardage (rope or wire) is attached to the top of the mainsail and pulls it upward.

The mainsail is set by pulling the halyard while rotating the boom. Therefore, the main sail, which is wound around the boom when not in use, is set by unwinding it from the boom and winding it through the halyard attached to the head. Furling 8 and reefing the mainsail are performed by loosening the halyard and rotating the boom to wrap the mainsail around the boom.

As the mainsail continues to be wrapped around the boom, the shape of the sail wrapped on the boom is often conical, with its larger diameter end pointing toward the mast. This conical shape causes many things.

That is, the bead on the edge of the sail and the cross that attaches the bead to the sail create a pulker (thickness) in this area. Therefore, when the sail is wound, this bulk causes the roll to have a larger diameter than the area of the sail away from the bead. Additionally, when the sail is hoisted, the unsupported sides of the sail are under more tension than the beaded sides of the sail. The reason for this is that this side supports the weight of the boom. This side tension winds the sail more tightly in this region than in the region of the sail near the bead and mast, so that the diameter of the wound sail is smaller in this region.

As the mainsail is further wrapped around the boom, the conical sail already wrapped around the boom moves the mainsail towards the mast.

This forces the forward edge of the sail together with the bead towards the mast. However, space limitations and tracks in this region prevent the bead from moving in this direction. This causes severe wrinkling in this area of the sail as the sail continues to wrap around the boom.

U.S. Pat. No. 3,285,215 discloses solving the build-up problem by removing the bead so that the rolled sail lies flat. U.S. Pat. No. 4,324,192 uses a connecting member near the mast to guide the bead to a position on the boom away from the mast, thereby preventing the sail from moving toward the mast.

SUMMARY OF THE INVENTION The present invention is generally characterized as a roller reefing boom device comprising: a mast having a track for receiving an edge bead of a sail; and a boom having a rotatably supported hoisting member that increases in diameter as it is supported and distanced from the mast. When the sail is wrapped around the member,
The build-up caused by the bead is compensated for by the extra space provided at the small diameter end around which the bead is wrapped.

In a preferred embodiment, the boom has a tubular outer shell that surrounds the hoisting member and defines a slot through which the sail passes. The winding member can have a continuously increasing diameter (e.g. conical shape) or a plurality of steps of increasing diameter.

(Example) Referring to FIG. 1, the main sail rigging 10 is
2, includes a boom 14 and a main sail 16.

The main sail 16 is connected at its bottom to the boom 14, and its vertical section connects to the mast 1 through a luff heat 18.
It is connected to two trucks 20. The bead 18 is held in place on the track 20 and is raised by a halyard (not shown).

Boom 14 is rotatably attached to mast 12 so that mainsail 16 can rotate about boom 14 (see FIG. 2), which acts as a hoisting member around which sail 16 is hoisted. The boom 14 is shaped such that its diameter increases from an end 22 near the mast to an end 24 opposite this end. The boom 14 thus assumes a conical shape. boom 1
The length of 4 is 3.7m, and the diameter near the mast is 3°8cm.
The diameter of the other end is 7.6 cm. Bead 18 is 0.4
It has a diameter of 8 cm.

(Function) Referring to FIG. 2, when the main sail 16 is wound around the conical boom 14, the boom 14 will move as described above.
interacts with the tendency of the sail 26 to form a conical shape. Thus, when the mainsail 16 is initially rolled up, the portion near the end 24 has a larger diameter than the portion near the end 22. Sails have a tendency to move towards larger diameters. Therefore, the sail initially has a tendency to move outwards and the bead lies outside of the bead of the previous turn. The second representative leaf position
As shown in the figure. When about half of the sail is hoisted, the hoisted sail will have an approximately cylindrical shape. As you wind further, the larger diameter approaches the mast and the bead begins to sit inside the bead of the previous roll. The shape of the boom thus prevents the problem of the sail rising towards the mast and forming wrinkles.

(Other Embodiments) Referring to FIG. 3, the boom 29 has a conical rotating member 30 and an outer shell 32, in which the rotating member 30 is rotatably supported. Shell 32 has a slot 34 along the top that allows mainsail 16 to enter boom 29 and wrap around rotating member 30. The use of a shell allows the mounting line to be located outside the end of the boom. Referring to FIG. 4, rotating member 30 is not smoothly and continuously conical, but instead has a stepped diameter, such as rotating member 40. Referring to FIG.

[Brief explanation of the drawing]

FIG. 1 is a schematic elevational view showing a roller reefing boom device of the present invention, FIG. 2 is a schematic elevational view showing the device of FIG. 1 with the sail partially retracted, and FIG. 3 is a schematic elevational view showing the device of the invention FIG. 4 is a schematic elevation view showing the most preferred embodiment of the roller reefing boom device of the present invention, and FIG. 4 is a schematic elevation view showing another embodiment of the roller reefing boom device of the present invention. (Explanation of main symbols) 12: Mast, 14: Boom, 162 Mainsail, 18: Bead.

Claims (1)

Claims: 1. A roller reef boom device comprising: a mast having a track for accommodating a bead along the edge of a sail; and a boom supported by the mast, the boom being a hoisting member rotatably supported at a first end, the hoisting member having a second end, the first end adjacent the mast, and the hoisting member A roller reef boom device adapted to be attached to the bottom of the sail, wherein the hoisting member is adapted to increase in diameter from a first end to a second end. 2. The roller leaf boom device according to claim 1, wherein the diameter of the hoisting member increases continuously. 3. The roller leaf boom device according to claim 2, wherein the hoisting member has a substantially conical shape. 4. The roller leaf boom device of claim 1, wherein the hoisting member has a plurality of stepped diameters. 5. The boom of claim 1, wherein the boom has a tubular outer shell surrounding the hoisting member and defining a slot through which the sail passes. Roller leaf boom device.