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The invention provides a davit with a number of useful features. A jib of the davit can be made with an overload indicator, which provides a straightforward, visible mechanism to ascertain whether the davit is fit for use following an overload condition. The jib can be made collapsible with telescop

The invention provides a davit with a number of useful features. A jib of the davit can be made with an overload indicator, which provides a straightforward, visible mechanism to ascertain whether the davit is fit for use following an overload condition. The jib can be made collapsible with telescoping sections, at least one of the sections having a plurality of flats to allow easy connection with other components of the davit, such as the lifting head. A single bearing can be used to rotatably couple the davit to the shaft, or king post, with a plurality of different-spaced bores to account for different diameters of shaft. Either or both of these improvements allow the davit to be manufactured easily and erected easily by users.

대표청구항 ▼

1. A davit, comprising: a column, mountable for rotation about a generally upright axis; anda jib attached to the column, wherein the jib comprises: an inner jib section and a hollow outer jib section, the inner section received in the outer jib section in a telescopic arrangement, such that the inn

1. A davit, comprising: a column, mountable for rotation about a generally upright axis; anda jib attached to the column, wherein the jib comprises: an inner jib section and a hollow outer jib section, the inner section received in the outer jib section in a telescopic arrangement, such that the inner jib section is moveable between an extended position and a retracted position, and wherein an outer profile of the inner section comprises first and second substantially parallel sidewalls. 2. The davit according to claim 1 wherein the first and second sidewalls are connected to each other at each end by an arc, each arc having an outer profile that substantially corresponds in shape to a portion of an inner profile of the outer section. 3. The davit according to claim 2, wherein the inner profile of the outer jib section is generally circular. 4. The davit according to claim 1, wherein an outer profile of the outer jib section has a plurality of flat portions. 5. The davit according to claim 1, further comprising a head, the head comprising: a first plate attached to the first sidewall by one or more fasteners and a second plate attached to the second sidewall by one or more fasteners, the head further comprising one or more tools for attaching a load. 6. The davit according to claim 5, wherein the first and second plates are attached to each other by one or more linking pins, and the one or more tools are mounted on one or more of the linking pins. 7. The davit according to claim 6, wherein the linking pins are moveable between at least first and second positions defined by slots in the first and second plates. 8. The davit according to claim 5, wherein the one or more tools comprise one or more of: sheaves and shackles. 9. The davit according to claim 1, wherein the jib is attached pivotally with respect to the column. 10. The davit according to claim 1, wherein a first end of the jib is attached to the column at a lower connection point of the column, and further comprising a backstay coupled between a second end of the jib and an upper connection point of the column. 11. The davit according to claim 10, wherein the backstay comprises one or more joints to allow folding thereof. 12. The davit according to claim 11, wherein the joints are arranged to allow folding of the backstay in a single direction only. 13. The davit according to claim 12, wherein the backstay comprises an upper limb pivotally connected to a lower limb, and wherein either part of the lower limb overlaps the upper limb or part of the upper limb overlaps the lower limb, such that the backstay is prevented from folding in one direction. 14. The davit according to claim 10, wherein the backstay is pivotally coupled to the upper connection point of the column via a mechanism for adjusting the radial length of the backstay from the column. 15. The davit according to claim 14, wherein the mechanism comprises one of: a plurality of upper connection points machined at different radial distances from the column; anda cam rotatably mounted on the column, wherein the cam comprises the upper connection point. 16. A davit, comprising: a column, mountable for rotation about a generally upright axis; anda jib attached to the column, wherein the jib comprises: an inner jib section and a hollow outer jib section, the inner section received in the outer jib section in a telescopic arrangement, such that the inner jib section is moveable between an extended position and a retracted position, wherein the inner jib section and the outer jib section have connection apertures for receiving a connection pin to allow the inner jib section to be fixed in at least the extended position, and wherein the inner jib section and the outer jib section are configured to deform differently if the davit becomes overloaded, such that the connection apertures no longer align. 17. The davit according to claim 16, wherein the outer jib section is configured to deform to a greater extent than the inner jib section if the davit becomes overloaded. 18. The davit according to claim 17, wherein the inner jib section is hollow and wherein walls of the outer jib section are thinner than walls of the inner jib section. 19. The davit according to claim 16, wherein the inner jib section and the outer jib section are configured to deform differently in that the connection apertures of the inner jib section are configured to deform differently to the connection apertures of the outer jib section. 20. The davit according to claim 16, wherein the connection apertures further allow the inner jib section to be fixed in the retracted position, and wherein the inner jib section and the outer jib section are configured to deform differently if the davit becomes overloaded, such that the connection apertures no longer align when the inner jib section is in the refracted position. 21. A bearing for allowing a column of a davit to be rotatably mounted on a substantially upright shaft, the bearing having a body shaped to correspond to an internal profile of the column, the body having a first bore for receiving a component on which the bearing bears and a first pair of parallel, spaced second bores, narrower than the first bore, which extend across the first bore in a direction perpendicular to an axis of the first bore and are configured to receive retaining pins which engage with a groove in the component received in the first bore. 22. The bearing according to claim 21, wherein the component is the shaft. 23. The bearing according to claim 21, wherein the component is a sleeve mounted on the shaft. 24. The bearing according to claim 21, further comprising a second pair of parallel, spaced second bores which extend across the first bore in a direction perpendicular to an axis of the first bore. 25. The bearing according to claim 24, wherein the first pair of second bores are spaced a first distance apart, and the second pair of second bores are spaced a second, different distance apart. 26. The bearing according to claim 21, wherein the outer component has an outer profile that corresponds to a box section.