Ships – Spars – Gaffs – booms – etc.
Patent
1987-04-21
1988-11-08
Basinger, Sherman D.
Ships
Spars
Gaffs, booms, etc.
114 392, 114102, B63B 1500
Patent
active
047827807
DESCRIPTION:
BRIEF SUMMARY
This Invention relates to sailing boats and in particular the sail booms used with sail craft.
In one form the invention resides in a mast end boom mounting for a sailing craft comprising a pair of members hingedly interconnected and shaped to encompass a mast in closely abutting relationship, at least one of said members being adapted to be mounted to said boom, locking means provided to engage both members and retain them in close abutting relationship with the mast.
According to a preferred feature of the invention said hingeable connection is capable of disengagement.
According to a further preferred feature of the invention said locking means is provided between said members in opposed relation to the hinged interconnection.
According to a further preferred feature of the invention said hinged interconnection comprises a substantially radially directed protrusion on one member receivable in a socket provided on the other member.
According to a further preferred feature of the invention said locking means comprises a locking member engageable with each member.
According to a preferred feature of the previous feature the locking member is pivotally supported from one member and is engagable over an abuttment provided on the other member.
According to a preferred feature of the invention a resilient cushioning material is provided on the opposed faces of the members.
According to a preferred feature of the invention each member is adapted to receive one end of one side of wishbone boom.
According to another form the invention resides in a wishbone boom having a mast end boom mounting of the form described above.
According to a preferred feature of the invention the outer end of the boom comprises a clew end fitting comprising a pair of members pivotally interconnected and each adapted to engage a side member of the boom.
The invention will be more fully understood in the light of the following description of one specific embodiment. The description is made with reference to the accompanying drawings of which:
FIG. 1 is a plan view of the boom mounting of the embodiment;
FIG. 2 is a front elevation of the embodiment;
FIG. 3 is a rear elevation of the embodiment; and
FIG. 4 is a plan view of a boom according to the embodiment.
The embodiment is directed to wishbone booms for use with sailboards. The boom of a sailboard is secured to a mast at about shoulder height and comprises a pair of curved tubes which extend to each side of the sail. The tubes are interconnected at their outer end by a clew end fitting. The boom end of the tubes are interconnected by a mast end fitting. The mast end fitting is generally fixed to the mast by a length of rope which has several disadvantages including:
(a) It is difficult to tie the rope tightly enough to prevent movement between the boom and mast about axial and transverse axes of the mast.
(b) The rope has a tendancy to stretch or loosen during use to cause the boom to move forward on the mast and thus reduce the clew tension on the sail.
(c) The fitting is bulky which can be detrimental to performance and handling. against the mast to prevent movement therebetwen. Such an arrangement however have produced differential loads on the mast section which have lead to the crushing of the mast. In addition, they have caused excessive wear of the mast.
The embodiment is intended to overcome the abovementioned disadvantages.
The embodiment utilises a mast end boom mounting 10 as shown as FIGS. 1, 2 and 3. The mounting 10 comprises a pair of members 11 and 12 which together define a complementary inner surface 13 which encompasses the mast (not shown). The inner surface 13 is provided by substantially semi-annular cushioning members 14 supported by the respective members formed of a resilient cushioning material which will grip the surface of the mast to prevent movement of the boom on the mast when engaged with the mast. To enhance the frictional resistance to movement of the boom along the mast the inner faces 13 of the cushioning members 14 are formed with a set of parallel
Basinger Sherman D.
Smitech Pty. Ltd.
Sotelo Jesus D.
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