EP0230465B1 - Boom and boomhead for windsurfer - Google Patents

Boom and boomhead for windsurfer Download PDF

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Publication number
EP0230465B1
EP0230465B1 EP86904789A EP86904789A EP0230465B1 EP 0230465 B1 EP0230465 B1 EP 0230465B1 EP 86904789 A EP86904789 A EP 86904789A EP 86904789 A EP86904789 A EP 86904789A EP 0230465 B1 EP0230465 B1 EP 0230465B1
Authority
EP
European Patent Office
Prior art keywords
boom
boomhead
mast
jaws
joint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86904789A
Other languages
German (de)
French (fr)
Other versions
EP0230465A1 (en
Inventor
Henrik Bartholin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BARTHOLIN Niels
Original Assignee
BARTHOLIN Niels
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BARTHOLIN Niels filed Critical BARTHOLIN Niels
Publication of EP0230465A1 publication Critical patent/EP0230465A1/en
Application granted granted Critical
Publication of EP0230465B1 publication Critical patent/EP0230465B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H8/00—Sail or rigging arrangements specially adapted for water sports boards, e.g. for windsurfing or kitesurfing
    • B63H8/20—Rigging arrangements involving masts, e.g. for windsurfing
    • B63H8/22—Rigging arrangements involving masts, e.g. for windsurfing for connecting wishbones to the mast

Definitions

  • the invention concerns a boom and a boomhead for a windsurfer, the boom consisting of two arms which in one end - possibly demountably - are attached to a boomhead, consisting of two jaws, which are designed for clutching a mast and are mutually connected by a joint, flexible or connected in a hinge-like manner.
  • This joint might be designed as a hinge connection or an elastic piece of metal or plastic.
  • Such a windsurfer boom and boomhead are known from PCT publication n'WO 79/01078.
  • the joint of the boomhead is placed in front of the jaws, i.e. opposite the part of the boomhead attached to or designed for attachment to the boom arms.
  • the joint of the boomhead is placed on the side of the mast, opposite the boom arms.
  • the boom of this known invention will - when stressed - tend to pull the end of the boom opposite the boomhead towards the mast and against the elasticity of the boom arms. This causes the boom arms to be pressed outwards (their curvature increases), resulting in a reduced pressure of the jaws against the mast.
  • a disadvantage of the known technique is thus that the strength of the attachment of the boom against the mast will decrease just as increasing wind force calls for more strength of the attachment.
  • the rig consists of a mast (1), placed in a casing at the front edge of a sail (2).
  • a boom (4) In the casing of the sail (2) there is an opening (3) designed for attachment of a boom (4) to the mast (1).
  • the boom (4) consists of a boomhead (5) placed against the mast and of two boom arms (6 and 7) in the front end attached to the boomhead (5), and in the rear end to a mounting (11), to which the sail (2) is fastened.
  • the boom (4) thus encircles the mast (1) and the sail (2).
  • the boom according to PCT publication n' WO 79/01078 consists of two boom arms (6 and 7), each connected to a jaw (8 and 9). Between the jaws (8 and 9) a mast (1) is held in position. In front of the mast (1), the jaws (8 and 9) are connected by a joint (10).
  • the boom according to the invention consists of two boom arms (6 and 7), each connected to a jaw (8 and 9). Between the jaws (8 and 9), a mast (1) is held in position. Behind the mast (1), the jaws (8 and 9) are connected by a joint (10) flexible like a hinge connection.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Jib Cranes (AREA)

Abstract

Boom, consisting of two boom arms (6 and 7), each connected to a jaw (8 and 9). Between the jaws (8 and 9), a mast (1) is held in position. Behind the mast (1), the jaws (8 and 9) are connected by a joint (10). The sail being stretched between the end of the boom opposite the boomhead (Fig. 1, 11) and the mast (Fig. 1, 1), the boomhead will - when stressed - benefit from the elasticity of the joint. This decreases the distance between the jaws, resulting in the mast being locked. The harder the rig is stressed, the stronger the mast and boom are connected.

Description

  • The invention concerns a boom and a boomhead for a windsurfer, the boom consisting of two arms which in one end - possibly demountably - are attached to a boomhead, consisting of two jaws, which are designed for clutching a mast and are mutually connected by a joint, flexible or connected in a hinge-like manner. This joint might be designed as a hinge connection or an elastic piece of metal or plastic.
  • Such a windsurfer boom and boomhead are known from PCT publication n'WO 79/01078. In this known, arrangement, the joint of the boomhead is placed in front of the jaws, i.e. opposite the part of the boomhead attached to or designed for attachment to the boom arms. When this known windurfer boom is mounted, the joint of the boomhead is placed on the side of the mast, opposite the boom arms.
  • The sail being stretched between the mast and the end of the boom opposite the boomhead, the boom of this known invention will - when stressed - tend to pull the end of the boom opposite the boomhead towards the mast and against the elasticity of the boom arms. This causes the boom arms to be pressed outwards (their curvature increases), resulting in a reduced pressure of the jaws against the mast. A disadvantage of the known technique is thus that the strength of the attachment of the boom against the mast will decrease just as increasing wind force calls for more strength of the attachment.
  • According to the invention, this disadvantage is eliminated, the joint being placed on the same side of the jaws as the part of the boomhead designed for attachment to the boom arms.
  • When the boom is mounted on the mast, the joint will be placed on the same side of the mast as the end of the boom opposite the boomhead, and (in accordance with the above explanation regarding the known technique) the stress will thus - contrary to what applies to the known technique - increase the pressure of the jaws against the mast. Moreover, according to the invention, mechanical locking devices etc. are no longer needed.
  • Now follows a detailed description of the invention, referring to the drawing, where
    • fig. 1 shows boom and sail mounted on a mast,
    • fig. 2 shows the known boomhead construction, seen from above,
    • fig. 3 shows the boomhead according to the invention, also seen from above.
    Figure 1
  • The rig consists of a mast (1), placed in a casing at the front edge of a sail (2). In the casing of the sail (2) there is an opening (3) designed for attachment of a boom (4) to the mast (1). The boom (4) consists of a boomhead (5) placed against the mast and of two boom arms (6 and 7) in the front end attached to the boomhead (5), and in the rear end to a mounting (11), to which the sail (2) is fastened. The boom (4) thus encircles the mast (1) and the sail (2).
    • Figure 2
  • The boom according to PCT publication n' WO 79/01078 consists of two boom arms (6 and 7), each connected to a jaw (8 and 9). Between the jaws (8 and 9) a mast (1) is held in position. In front of the mast (1), the jaws (8 and 9) are connected by a joint (10).
    • Figure 3
  • The boom according to the invention consists of two boom arms (6 and 7), each connected to a jaw (8 and 9). Between the jaws (8 and 9), a mast (1) is held in position. Behind the mast (1), the jaws (8 and 9) are connected by a joint (10) flexible like a hinge connection.

Claims (2)

1. Windsurfer boom, consisting of two boom arms (6 and 7), which is one end - possibly demountably - are attached to a boomhead, consisting of two jaws (8 and 9), which are designed for clutching a mast (1) and are mutually connected by a joint (10), flexible or connected in a hinge-like manner, preferentially a hinge connection or an elastic piece of metal or plastic, characterized in that the joint (10) is placed on the same side of the jaws (8 and 9) as the part of the . boomhead designed for attachment to the boom arms (6 and 7), so that the joint (10) is placed on the same side of the mast (1) as the end of the boom opposite the boomhead, when the boom (4) is mounted on the mast (1).
2. Boomhead used for the manufacturing of the windsurfer boom as per claim 1, which boomhead consists of two jaws (8 and 9), that are designed for clutching a mast (1) and are mutually connected by a joint (10), flexible or connected in a hinge-like manner, preferentially a hinge connection or an elastic piece of metal or plastic and which are designed for attachment to two boom arms (6 and 7), in which the joint (10) is placed on the same side of the jaws (8 and 9) as the part of the boomhead designed for attachment to the boom arms (6 and 7).
EP86904789A 1985-07-17 1986-07-17 Boom and boomhead for windsurfer Expired EP0230465B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK3239/85 1985-07-17
DK323985A DK152980C (en) 1985-07-17 1985-07-17 WINDSURFER BOM AND BOOM HEADS THEREOF

Publications (2)

Publication Number Publication Date
EP0230465A1 EP0230465A1 (en) 1987-08-05
EP0230465B1 true EP0230465B1 (en) 1989-10-11

Family

ID=8120650

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904789A Expired EP0230465B1 (en) 1985-07-17 1986-07-17 Boom and boomhead for windsurfer

Country Status (5)

Country Link
EP (1) EP0230465B1 (en)
AU (1) AU6221586A (en)
DE (1) DE3666205D1 (en)
DK (1) DK152980C (en)
WO (1) WO1987000503A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU599148B2 (en) * 1986-09-19 1990-07-12 Graeme Scott Attey Sailboard boom end fittings and sailboard boom systems
NL8702226A (en) * 1986-09-19 1988-04-18 Graeme Scott Attey BOOM OF A SAILBOARD AND BOOM FOR A SAILBOARD.
EP0272463A1 (en) * 1986-11-21 1988-06-29 McGregor, Garth Bruce Sailboard boom
DE3721325A1 (en) * 1987-06-27 1989-01-05 Rainer Buck Connecting device between the mast and wishbone boom of windsurfing equipment
GB2232140A (en) * 1989-05-20 1990-12-05 Peter Stuart Spencer Wishbone boom mast collar for a sailboard

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7914361U1 (en) * 1979-05-18 1979-09-06 Shark Wassersportgeraete Gmbh, 2830 Bassum FORK ARM FITTING

Also Published As

Publication number Publication date
WO1987000503A1 (en) 1987-01-29
DK323985A (en) 1987-01-18
DK152980C (en) 1988-10-24
AU6221586A (en) 1987-02-10
DK152980B (en) 1988-06-06
DK323985D0 (en) 1985-07-17
DE3666205D1 (en) 1989-11-16
EP0230465A1 (en) 1987-08-05

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