Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
  • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
  • B63B2039/065—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water the foils being pivotal about an axis substantially parallel to the longitudinal axis of the vessel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B41/00—Drop keels, e.g. centre boards or side boards ; Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels
  • B63B2041/003—Collapsible keels, or the like, e.g. telescopically; Longitudinally split hinged keels

Definitions

• the present invention relates to a keel for boats, the keel comprising two keel halves which, by means of a power unit and a power transmission system, are pivotal about a horizontal, longitudinally directed shaft or each about its respective shaft, disposed in side-by-side relationship and disposed in the upper region of the keel halves.
• the keel halves may be pivoted between one position in which their one side abuts against each others' and a position where the keel halves are separated.
• Keels consisting of two pivotable keel halves have previously been proposed in this art in German Offenlegungsschrift No. 2 454 377, U.S. patent specification No. 4,044,703 and French patent specifications Nos. 1,491,403 and 2,501,147.
• the disclosures of these publications have not displayed any accepted solut i on as to how a separably pivotal keel is to be constructed
• One object of the present invention is to devise an acceptable solution as to how the keel may readily be adapted to the majority of hulls without the necessity of making any large- scale modif cations to the hull proper. It should be possible to elect to provide a certain boat model with either a conventional keel or a pivotal keel according to the present invention, and also to replace or remount a previously mounted keel. Hence, the present invention makes for greater variety of selection as regards boat models, it not being necessary to limit such choice to certain particular boat models which, by sweeping modifications to the hull, have been originally adapted to accommodate pivotal keels.
• Fig. 1 shows a boat provided with a keel according to the present invention seen in front elevation, a number of the outwardly pivoted positions which the keel halves may assume being shown by broken lines;
• Fig. 2 is a schematic side elevation of the keel with its power transmission system
• Fig. 3 is a longitudinal section through the power transmission system and the keel strut of the one keel half;
• Fig. 4 is a section taken along the line A-A in Fig. 3;
• Fig. 5 is a view corresponding to that of Fig. 4, but with the keel halves in an outwardly pivoted position;
• Fig. 6 is a vertical section through the locking device which fixedly locks the keel halves to each other in their downwardly pivoted position;
• Fig. 7 is a section taken along the line B-B in Fig. 6;
• Fig. 8 is a section corresponding to that of Fig. 3, but in this figure the power transmission system has been provided with a guide mechanism;
• Fig. 9 is a section taken along the line C-C in Fig. 8;
• Fig. 10 is a schematic side elevation of the keel with an alternative embodiment of the power transmission system;
• Fig. 11 is a longitudinal section through the alternative power transmission system, the frame and the keel strut of one of the keel halves;
• Fig. 12 is a section taken along the line D-D in Fig. 11; and Fig. 13 is a corresponding view to that of Fig. 12, but with the keel halves in an outwardly pivoted position.
• Fig. 1 is a schematic view abaft a boat.
• the boat is provided with a keel which consists of two keel halves 2a, 2b.
• the keel halves are shown in their " downwardly pivoted, mutually abutting position, while broken lines show a number of examples of outwardly pivoted, separated positions which the keel halves may assume.
• Each keel half 2a, 2b is anchored in a plurality of keel struts 3a-f in Fig. 2, which, in their turn, are pivotally jointed at their upper ends to one of two shafts 4a and 4b.
• the shafts are anchored to a frame which, by means of keel bolts 10, is fixedly anchored to the hull 1 of the boat.
• a hydraulic cylinder 6 is bolted to the frame 5, the cylinder displacing, by means of its piston rod 7, a crosspiece 8 in the upward or downward direction.
• keel struts 3c and 3d are actuated by lifting rods 9a and 9b such that the keel halves 2a and 2b are caused to pivot away from or towards one another.
• This phenomenon will be described in greater detail with particular reference to Figs " . 3-5.
• Fig. 2 shows only the one keel half 2a with its keel struts 3a-f and lifting rods 9a, 9b.
• the space between the upper side of the keel halves and the horizontal section of the frame 5 has been exposed to make for clarity of perception. Naturally, this space may be covered by further masking plates and/or be partly filled with some material, for example lead or iron. However, such filling or masking must be effected such that the pivotal movement of the keel halves is not prevented or obstructed.
• the power transmission system is shown in greater detail in Figs. 3-5.
• the hydraulic cylinder 6 is fixedly anchored to the frame 5 by bolts II.
• the hydraulic cylinder is provided, in a per s ⁇ known manner, with a piston 12 and a piston rod 7.
• Pressure medium to the cylinders 6 is led via hoses 13a, 13b through holes in the keel bolts 10 to the one or other chamber of the cylinder.
• Regulation of the pressure medium to the chambers of the cylinders 6 may be effected in a per se known manner by means of valves, and pressurizing of the medium may be effected, for example, by means of an electrically-driven hydraulic pump or a hand pump.
• the piston rod 7 is threaded into the cross- piece 8, in which two lifting rods 9a, 9b associated with the one keel half 2a are pivotally anchored each to their shaft 14a, 14b.
• a further two lifting rods 9c associated with the keel half 2b are pivotally anchored to their cross-piece (only one of these lifting rods 9c is visible in Figs. 3-5).
• the other end of the lifting rods is pivotally anchored each to its stub shaft 15a-c, which are each disposed on their respective keel struts 3c, 3d, 3h, 3i.
• the keel struts 3c, 3h may pivot about the shaft 4a and the keel struts 3d, 3i may correspondingly pivot about the shaft 4b.
• the hose 13a is placed under pressure, pressure medium being supplied to the lower chamber of the cylinder 6.
• the piston rod 7 will move upwardly in Fig. 3, which also entails that the lifting rods 9a-c displace the stub shafts 15a-c upwardly and thereby pivot apart the keel halves 2a, 2b.
• the stub shafts 15a-c see Figs.
• Figs. 6 and 7 illustrate a locking device for fixedly locking the keel halves 2a, 2b to one another.
• the locking device consists of a locking hook 16 which is placed in a recess 17 on the inside of the one keel half 2a. In register with this recess 17, there is provided a recess 18 on the inside of the second keel half 2b.
• This recess 18 is provided with a locking eye 19 in which the locking hook 16 may fixedly catch or be disengaged from by rotation about a vertical axis.
• This rotation is effected by means of a lower torsion bar 20 in whose lower end the locking hook 16 is fixedly mounted and whose upper end is provided with a recess 21 of non-circular cross-section.
• This torsion bar 20 is placed in an aperture 22 which runs from the upper side 20 of the keel half 2a turned to face the frame 5 and to the recess 17 for the locking hook 16.
• the upper end of the torsion bar 20 is approximately flush with the upper side 23 of the keel half 2a.
• an upper torsion bar 24 which runs through an aperture 25 in the centre of a keel bolt 10 and to the lower region of the frame 5.
• the lower end 26 of the torsion bar 24 is of conical configuration with a cross-sectional area which corresponds to the cross- sectional area of the recess 21 of the lower torsion bar.
• the lower end 26 of the upper torsion bar is disposed in register with, and slightly above the recess 21 of the lower torsion bar.
• the upper region of the upper torsion bar is bent at a right angle, such that a handle 27 is formed, a helical spring 28 being further provided about the upper region and being placed under tension between the keel bolt 10 and a fixed washer 29 on the torsion bar 24.
• a helical spring 28 being further provided about the upper region and being placed under tension between the keel bolt 10 and a fixed washer 29 on the torsion bar 24.
• Figs. 8 and 9 illustrate a guide, whose purpose is to reduce the torque and flexural moments of force which may act upon the power transmission system exteriorally.
• the guide consists of an extension of both of the inner journal mounts of the cross-piece 8 for the stub shafts 14a, 14b, this extension forming a vertical flat portion 29.
• a vane 30 is disposed on each of the upper vertical edges of the portion 29.
• Each vane consists of two projecting portions 30a and 30b.
• the two opposing portions 30a form, together with the one longitudinal side of the portion 30, a guide in which one of the vertical sections 5a of the frame 5 forms a guide surface.
• the keel half 2a is anchored in a plurality of keel struts
• Fig. 10 is anchored in the keel struts 3g-l .
• the keel struts 3a-1 are pivotally joined to shafts 31a-c.
• the shaft 31a. is a common shaft for the keel struts 3a, 3b, 3g and 3h.
• the keel struts 3c, 3d, 3i, 3j are pivotally connected to the shaft 31b and the keel struts 3e, 3f, 3k, 31 to the shaft 31c.
• the shafts 31b and 31c are coupled to a cross-piece 32 which, in its turn, is vertically reciprocated by means of a power unit 6, for example a hydraulic cylinder.
• a further shaft 33a. runs between the keel struts 3a and 3b.
• lifting rod 34a is journalled at its one end to this shaft.
• the other end of the lifting rod 3 ⁇ a is journalled to a frame by the intermediary of the shaft 35a.
• the keel struts 3c and 3d are provided with shafts 33b, 35b and lifting rod 34b; and the keel struts 3e and 3f with shafts 33c, 35c and lifting rod 34c.
• the cross-piece 32 is, thus, displaced upwardly or downwardly, whereby the shafts 33a-c wilT also be entrained in this movement.
• Figs. 11-13 illustrate the alternative power transmission system in greater detail.
• the piston rod 7 is threaded into the cross-piece 32, to which the one end of the shafts 31b, 31c are coupled.
• the shafts 31b, 31c constitute pivotal centres for the keel halves 2a and 2b in that the keel struts are pivotally connected to these shafts.
• FIG. 11 only the lifting rods 34e and 34f associated with the keel half 2b are shown.
• the one end of these lifting rods 34e and 34f is pivotally connected in the shaft 35e and 35f, respectively, which, in their turn, are anchored in the frame 5.
• the other end of the lifting rods 34e and 34f are pivotally connected to the shaft 33e and 33f, respectively.
• the one end of the shaft 33e is anchored in the keel strut 3i, and the other end in the keel strut 3J.
• the ends of the shaft 33f are anchored in the keel struts 3k and 31.
• the same can also be said for the keel struts 3c-3f of the keel half 2a and the shafts 33b, 33c, 35b and 35c.
• the shafts 31a, 33a, 35a, the lifting rod 34a, the keel struts 3a, 3b, 3g, 3h, and corresponding parts associated with the keel half 2b see Fig. 10
• the keel halves 2a, 2b may, by the intermediary of the keel struts 3a-3c, each be suspended in their respective shaft, instead of the shafts 4a, 4b, 31a-31c which lie along a common, imaginary axis. In such an event, these shafts would be placed side-by-side in the same horizontal plane and at the same spaced-apart relationship from the vertical, longitudinal centre plane of the boat.
• the hydraulic cylinder 6 could conceivably be substituted by an electrically-driven motor or a cylinder using air as the pressure medium.
• the upper torsion bar 25 it is not necessary to design the upper torsion bar 25 as being spring-biased, it being also conceivable to design this torsion bar as releasably removable.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26659201

Family Applications (1)

Country Status (3)

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• 1987
  • 1987-06-26 EP EP19870904416 patent/EP0412965A1/de not_active Withdrawn
  • 1987-06-26 WO PCT/SE1987/000304 patent/WO1988000151A1/en not_active Application Discontinuation
  • 1987-06-26 AU AU76451/87A patent/AU7645187A/en not_active Abandoned

Non-Patent Citations (1)

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