EP0317661A1 - Wishbone télescopique - Google Patents

Wishbone télescopique Download PDF

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Publication number
EP0317661A1
EP0317661A1 EP87117368A EP87117368A EP0317661A1 EP 0317661 A1 EP0317661 A1 EP 0317661A1 EP 87117368 A EP87117368 A EP 87117368A EP 87117368 A EP87117368 A EP 87117368A EP 0317661 A1 EP0317661 A1 EP 0317661A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
locking
telescopic boom
spar
section
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.)
Withdrawn
Application number
EP87117368A
Other languages
German (de)
English (en)
Inventor
Jürgen Lingstäd
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.)
North Sails Windsurfing GmbH
Original Assignee
North Sails Windsurfing GmbH
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 North Sails Windsurfing GmbH filed Critical North Sails Windsurfing GmbH
Priority to EP87117368A priority Critical patent/EP0317661A1/fr
Priority to DE8810648U priority patent/DE8810648U1/de
Publication of EP0317661A1 publication Critical patent/EP0317661A1/fr
Withdrawn legal-status Critical Current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
    • B63H8/21—Wishbones

Definitions

  • the invention relates to a telescopic boom according to the preamble of patent claim 1.
  • Telescopic booms are already known, in which the spars of the rear boom part engage in the spars of the front boom part and can be non-positively connected to them in a selected insertion length by a locking device.
  • the locking device consists of a locking ring made of rubber, which is inserted into a selected circumferential groove of the inner spar and is covered by a widened end of the outer spar such that a further insertion of the inner spar is blocked. This creates a non-positive connection in the direction of insertion, but the inner rail always remains freely extendable.
  • a disadvantage of this known construction is that the outer spar and inner spar are not connected to one another in a rotationally secure manner. While in the early days of surfing the trapezoidal hook was fastened in the chest area and a transverse force acting approximately in the plane of the boom was exerted on the boom boom, today harnesses are mainly used, so that the direction of the very large trapezoidal forces has changed . The direction of force now runs at an angle to the boom level, ie diagonally downwards from the boom boom, which means that the boom is exposed to great loads in the torsion direction.
  • the boom must therefore have increased stability, with a telescopic boom it is required that the connection between the outer spar and the inner spar is twist-proof, so that the torsional forces occurring when trapeze driving are distributed substantially evenly between the two spars. This is not the case with the known telescopic fork trees of the type under consideration. In the known construction using the locking ring, in which only a non-positive connection is created in the direction of insertion, it can also come to a brief extension of the loaded side of the boom when trapezoidal in the event of abruptly occurring large transverse forces, so that the always free extensibility of the inner spar is also associated with stability problems .
  • the present invention has for its object to develop a telescopic boom of the type under consideration so that it has increased stability.
  • the locking device of the telescopic boom should create a torsion-proof connection between the outer spar and the inner spar under the conditions that occur in practice, especially when trapeze-driving.
  • the telescopic boom should be easy to use and have a robust structure.
  • the locking device of the boom has an inner sleeve firmly connected to the outer spar with at least one locking portion extending in the circumferential direction of the inner spar and an outer sleeve with a rear end portion with a decreasing inner diameter, the dimensions of the at least one locking portion and the preferably tapering Inner surface of the end portion of the outer sleeve are coordinated so that the locking section is pressed firmly against the inner spar by advancing the outer sleeve on the inner sleeve. This creates a non-positive connection in both the axial direction and in the direction of rotation between the outer spar and the inner spar, which withstands all loads that occur.
  • the outer sleeve is moved back on the inner sleeve, whereby the at least one locking section is released again and can be brought into the desired new position by appropriate insertion or by pulling out the inner spar.
  • Axially extending tongues each of which has at least one locking section, should be cut free from the end section of the inner sleeve protruding beyond the end of the outer spar.
  • the tongues which are made of an elastic material, allow the radial movement of the locking section between the clamping position and the release position.
  • the tongues are advantageously cut free in such a way that that in the locking position, ie in the radially inner position of the tongues, the lateral longitudinal edges of which lie against one another, as a result of which the torsion resistance of the inner sleeve is increased in the region of the tongues. This also creates a practically watertight connection between the outer spar and the inner spar.
  • a bulge-shaped thickening can be formed as a blocking section on the free end of the tongues, which can engage in a selected annular locking recess, of which several are formed in the outer surface of the inner spar at an axial distance from one another.
  • the tongues can be shaped so that they spring into the respective groove without being acted upon by the outer sleeve with their thickened portions forming a circular ring, but in this state they allow the free movement of the inner spar by exercising a corresponding pull or Slide the pressure force out of the groove. This considerably simplifies the setting of a new length of the boom compared to the connection described above using rubber rings.
  • the bottom of the latching depressions and / or the opposite peripheral surface of the bead-shaped thickening is or are provided with a profile. This can be a toothing that ensures absolute security against rotation.
  • the tongues can each be provided with a wedge-like locking section which widens radially in the axial feed direction of the outer sleeve and has a contact surface corresponding to the cylindrical shape of the inner spar and an inclined outer surface on which the tapered inner wall section of the outer sleeve whose feed runs up.
  • the wedge surface of the locking section and the run-up surface of the outer sleeve expediently have a corresponding inclination, which can be straight or curved.
  • the inner surface of the locking section is pressed against the opposite circumferential surface of the inner spar and produces the desired non-positive connection in all directions without detent recesses being formed in the circumferential surface of the inner sleeve.
  • the latter can be provided with a profile or roughened, this naturally also applies to the contact surface of the locking sections.
  • High friction can also be achieved by coating with a material with a high coefficient of friction.
  • the tongues each have only one locking section in the form of the wedge described above, this is expediently formed in the region of the free end of the tongue.
  • the all-round positive connection is caused exclusively by frictional forces.
  • the tongues can be provided with a bead-shaped thickening at their free end as well as with a wedge-like locking section, which further increases the stability of the boom and achieves maximum strength of the connection both in the axial and in the circumferential direction of the bars becomes.
  • a bead-shaped thickening at their free end as well as with a wedge-like locking section, which further increases the stability of the boom and achieves maximum strength of the connection both in the axial and in the circumferential direction of the bars becomes.
  • the inner sleeve be provided with an external thread and the outer sleeve with a corresponding internal thread.
  • the feed of the outer sleeve on the inner sleeve is thus accomplished by a screwing process with which a large clamping force can be achieved in a simple manner.
  • the locking position is always reliably maintained.
  • the outer sleeve can be pushed onto the inner sleeve in the axial direction of the spars and fastened in the clamping position of the locking sections by means of a bayonet catch.
  • the outer sleeve can have at least one, but expediently two or three, radially inwardly projecting lugs, which are guided in the associated longitudinal grooves of the inner sleeve and, when the clamping position is reached, can enter laterally angled groove sections by rotating the outer sleeve, as a result of which the outer sleeve can be axially Direction is kept.
  • an inner sleeve 2 is firmly connected to an outer bar 1, onto which an outer sleeve 3 can be screwed for fastening an inner bar not shown in this figure.
  • the inner sleeve 2 has in in its central area a threaded section 4 with a pointed thread, to which an internally threaded section 5 of the outer sleeve 3 corresponds (FIG. 2).
  • a plurality of tongues 6 are cut free, with such a small space that the longitudinal side edges 7 of the tongues 6 abut one another in their radially inner clamping position. This increases the torsional strength between the outer spar 1 and the inner spar 8 in the locking position and prevents water from entering the inside of the spars.
  • bead-shaped thickening 9 is formed, which can snap into one of several axially spaced grooves 10 in the peripheral surface of the inner spar 8.
  • the outer sleeve 3 is advanced by a screwing operation on the inner sleeve 2, the inner wall surface of a rear, tapering end portion 11 running onto the overall annular bead 9 and firmly fitting it presses the selected depression 10.
  • the clamping force indicated by arrows A in FIG. 2 causes a force-locking connection in both the axial directions and in the circumferential direction of the spars 1, 8.
  • Fig. 3 shows a second embodiment of the invention, in which no grooves are formed in the peripheral surface of the inner spar 12.
  • the length of the fork is continuously adjustable Baums enables.
  • the inner sleeve 13 has at its cut-out tongues essentially wedge-shaped widening locking sections 14 which are pressed against the inner spar 12 with a bearing surface adapted to the cylindrical shape of the inner spar 12 when a corresponding wedge-shaped end section 15 of the outer sleeve 16 is pressed onto the outer wedge surface of the locking section 14 accumulates.
  • This connection also creates a non-positive connection between the spars 1 and 12.
  • both a bulge-shaped thickening 18 and a wedge-like locking section 19 are formed on the tongues of the inner sleeve 17.
  • correspondingly inclined inner wall sections of the end section of the outer sleeve 20 run on both the radially outer wedge surface of the locking section 19 and on the bulge-shaped thickening 18, which can advantageously also have a wedge-shaped outer surface, and press the bead-shaped one Thickening 18 firmly against the bottom of the selected groove 10 and the inner surface of the locking portion 19 against the circumferential surface of the inner spar 8. This achieves a maximum clamping force.
  • a toothing acting in the circumferential direction can be provided between the radially inner surfaces of the locking section and / or the bead-shaped thickening and the associated circumferential surfaces of the inner spar.
  • at least one can preferably extend in the axial direction on each tongue the projection or tooth can be formed, which engages in a corresponding longitudinal recess of the inner spar.
  • the arrangement of the projections and depressions can also be reversed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
EP87117368A 1987-11-25 1987-11-25 Wishbone télescopique Withdrawn EP0317661A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP87117368A EP0317661A1 (fr) 1987-11-25 1987-11-25 Wishbone télescopique
DE8810648U DE8810648U1 (de) 1987-11-25 1988-08-23 Teleskopgabelbaum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87117368A EP0317661A1 (fr) 1987-11-25 1987-11-25 Wishbone télescopique

Publications (1)

Publication Number Publication Date
EP0317661A1 true EP0317661A1 (fr) 1989-05-31

Family

ID=8197474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87117368A Withdrawn EP0317661A1 (fr) 1987-11-25 1987-11-25 Wishbone télescopique

Country Status (2)

Country Link
EP (1) EP0317661A1 (fr)
DE (1) DE8810648U1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449194A1 (fr) * 1990-03-30 1991-10-02 Günther Kies Dispositif de verrouillage avec réglage continu pour des tubes guidés télescopiquement
US5193476A (en) * 1990-09-15 1993-03-16 Marc Namur Lengthwise adjustable wishbone for sailboards
EP0698549A1 (fr) 1994-08-23 1996-02-28 Fanatic Sports GmbH Wishbone à longueur réglable pour planches à voile
WO2019204897A1 (fr) * 2018-04-27 2019-10-31 Noetic Technologies Inc. Extension d'anse réglable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH239806A (fr) * 1942-10-15 1945-11-15 Mani Louis Dispositif comprenant au moins un ensemble extensible présentant deux éléments tubulaires coulissants.
DE3143793A1 (de) * 1981-11-04 1983-05-11 Werner 8756 Kahl Haus Gabelbaum
FR2586005A1 (fr) * 1985-08-07 1987-02-13 Profil Wishbone a geometrie variable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH239806A (fr) * 1942-10-15 1945-11-15 Mani Louis Dispositif comprenant au moins un ensemble extensible présentant deux éléments tubulaires coulissants.
DE3143793A1 (de) * 1981-11-04 1983-05-11 Werner 8756 Kahl Haus Gabelbaum
FR2586005A1 (fr) * 1985-08-07 1987-02-13 Profil Wishbone a geometrie variable

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0449194A1 (fr) * 1990-03-30 1991-10-02 Günther Kies Dispositif de verrouillage avec réglage continu pour des tubes guidés télescopiquement
US5193476A (en) * 1990-09-15 1993-03-16 Marc Namur Lengthwise adjustable wishbone for sailboards
EP0698549A1 (fr) 1994-08-23 1996-02-28 Fanatic Sports GmbH Wishbone à longueur réglable pour planches à voile
US5584259A (en) * 1994-08-23 1996-12-17 Fanatic Sports Gmbh Lengthwise adjustable forked boom for surfboards
DE19509758C2 (de) * 1994-08-23 1998-10-29 Fanatic Sa Längenverstellbarer Gabelbaum für Surfbretter
WO2019204897A1 (fr) * 2018-04-27 2019-10-31 Noetic Technologies Inc. Extension d'anse réglable
CN112005019A (zh) * 2018-04-27 2020-11-27 诺伊蒂克技术股份有限公司 可调提环延长件
US10982711B2 (en) 2018-04-27 2021-04-20 Noetic Technologies Inc. Adjustable-length bail extension
CN112005019B (zh) * 2018-04-27 2022-04-26 诺伊蒂克技术股份有限公司 可变长度结构元件和可调提环延长件

Also Published As

Publication number Publication date
DE8810648U1 (de) 1988-10-20

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