Ships – Spars – Gaffs – booms – etc.
Patent
1985-10-22
1987-05-19
Barefoot, Galen L.
Ships
Spars
Gaffs, booms, etc.
114 99, B63H 910
Patent
active
046658521
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for securing a forked boom to a mast. The device includes clamping elements which engage the mast and are provided on a retaining member which at least party surrounds the mast.
A device of that kind, which is known from German Utility Model Specifications 78 01 634, comprises two double-armed levers, which are pivoted to retaining members, which are connected to the U-shaped fitting that is mounted on the forked boom. Clamping jaws adapted to be forced against the mast are carried by said levers at one end thereof, and an eccentric tightener for exerting the clamping force engages said levers at their other ends.
A fixing device known from German Utility Model 79 34 981 comprises a cuff, which is adapted to be clamped to the mast by a clamp screw, or clamping jaws, which embrace the mast like tongs and are adapted to be forced against each other by an eccentric toggle.
In a device which is of the kind described first hereinbefore and is known from prior Patent Application P 31 30 838.4, which is no prior publication, clamping jaws are connected to the U-shaped retaining member by means of parallel links and engage opposite sides of the mast and are adapated to be locked in their clamping position when they have been tightened by means which are similar to a toggle joint.
It is an object of the invention to provide a device which is simple and can easily be actuated and by which the formed boom can be reliably clamped to the mast.
In a device of the kind described first hereinbefore that object is accomplished in accordance with the invention in that the retaining member is annular and is larger in diameter than the mast and that at least one wedge-shaped clamping element is slidably mounted in the annular space between the retaining member and the mast. In the device in accordance with the invention of the retaining member virtually constitutes a supporting cuff, which is firmly clamped against the mast by the wedge-shaped clamping element.
The wedge-shaped clamping elements may be axially slidable relative to the mast. They may consist of two claimping wedges, which engage opposite sides of the mast. The inside surface of the annular or cuff-shaped retaining member is suitably inclined to the retaining wedge. The clamping wedges may be guided in grooves formed in the inside surface of the retaining member. On that side which faces the mast the clamping wedges may carry clamping jaws having the shape of a segment of a cylinder.
In accordance with a further feature of the invention the clamping element consists of a ring, which is wedge-shaped in cross-section. The cuff-shaped retaining member and the annular clamping element may be provided with recesses so that the device can be clamped against the mast with the mast pocket interposed.
The tightening device may consist of a two-armed lever or of a tightening device including a toggle joint or an eccentric.
In accordance with a further feature of the invention an extension lever which is capable of a limited pivotal movement opposite to the tightening direction may be connected to the tightening lever, and the starting rope may be secured to the free end of said extension lever. That lever which constitutes an extension of the tightening lever virtually provides means for pulling the formed boom so that the mast can be more easily pulled out of the water. Such means for pulling on the forked boom has been described in the prior Patent Application P 31 17 312.8.
In accordance with a further feature of the invention, curved clamping wedges which are slidable in the peripheral direction are held in the annular gap. If said clamping wedges are disposed on opposite sides of the center plante which is defined by the taut sail, the clamping force will be increased by the tension exerted on the forked boom. The annular wedges may be guided in grooves of the retaining member. The retaining wedges may be spring-loaded toward the ends of the retaining members. For a displacement of the retaining members to the open position, the re
REFERENCES:
patent: 4448142 (1984-05-01), Pollard
Huss Otto
Janich Karl
Marker Hannes
Avila Stephen P.
Barefoot Galen L.
Marker Hannes
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