WO2001042080A1

WO2001042080A1 - Bearing for shipramps

Info

Publication number: WO2001042080A1
Application number: PCT/SE2000/002464
Authority: WO
Inventors: Karl-Bertil EKSTRÖM; Leif Persson
Original assignee: Hamworthy Kse Ab
Priority date: 1999-12-10
Filing date: 2000-12-08
Publication date: 2001-06-14
Also published as: SE9904536L; SE521690C2; AU2037401A; SE9904536D0

Abstract

The invention relates to a hinge pivot (1) for vessel ramps (2) and similar pivotally mounted hatches. Bearing attachments (4, 5, 51) connected to one another and provided with holes and attached respectively to the frame and the ramp (2), etc., of the vessel are held together by means of a pivot shaft (7) extending along the intended pivot axis (6). One of the bearing attachments (4, 5, 51) is capable of being divided in its axial sense (9, 10). The aforementioned dividable bearing attachment (5) is in the form of a cover (15) provided with holes which is so arranged as to be screwed to one (5) of the aforementioned two bearing attachments (5, 51).

Description

Bearing for shipra ps .

The present invention relates to a hinge pivot for vessel ramps and similar pivotally mounted hatches.

When it was wished to repair bearings in previously disclosed hinge pivots for large and heavy ramps of the kind that are pivotally mounted about horizontal pivot shafts, it was necessary to lift the ramp as a whole during the repair work. A ramp often weighs up to 100 tonnes, and heavy lifting equipment is accordingly required in order to be able to lift such a heavy ramp, which is expensive because lifting equipment of the kind required must support the ramp for the entire duration of the dismantling and assembly process and, naturally, also during the repair work. There is an associated risk of the attachment plate, to which the bearing is securely locked, working loose during operation as a result of the forces acting on the bearing, in conjunction with which ball bearings, for example, are caused to fracture for that reason.

German patent publication 1,158,401 shows an articulation between hinged hatches on a vessel. The aforementioned articulations are divided and comprise a shaft pin which connects the end parts of two bearing pins together in a pivoting fashion and is locked by means of locking blocks, one of which is permanent and the other is in a recess in the aforementioned shaft pin. The aforementioned shaft pin can be caused to move, by pivoting the bearing pins, between a lowered and a raised position; see Figs. 8 and 9. The bearing attachments are formed by pin shanks, which are single and double, and locking is effected by means of a securely welded component and a bolted locking block. The possibility of removing the bolted locking block is provided, and the shaft pin can then be withdrawn after first causing the bearing as a whole to rotate through 180°. This is difficult if the bearing weighs up to several tonnes.

The principal object of the present invention is thus, in the first instance, to solve the above problems by simple and effective means.

The aforementioned object is achieved by means of a hinge pivot in accordance with the present invention, which is characterized essentially in that bearing attachments connected to one another and attached respectively to the frame and the ramp of the vessel and provided with holes are

intended pivot axis, and in that one of the bearing attachments is capable of being divided in its axial sense. The hinge pivot to which the present invention relates is illustrated in the accompanying drawings, in whic :

Fig. 1 shows a perspective view of a hinge pivot viewed from the inside of a supported ramp with the ramp lowered;

Fig. 2 shows the hinge pivot viewed from outside with the ramp in the lowered position;

Fig. 3 shows an exploded view of an aforementioned hinge pivot;

hinge pivot;

Fig. 5 shows a sectioned view of the hinge pivot installed and with the ramp in the upward pivoted position;

and associated bearing components on a vessel and the ramp along the line VI-VI in Fig. 5; and

Figs. ^"7 and 3 show the bearing shaft rotated througn 90 degrees in two positions rotated in relation to one another about the bearinσ shaft. A hinge piv^t 1 intended for vessel ramps 2 and other similar pivotally mounted hatches comprises, in

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5, 5 connected to one another and provided with holes and attached respectively to the frame 3 and the ramp 2, etc., of the vessel. The aforementioned bearing attachments 4, 5, 5¹ are held together by means of a pivot shaft 7 extending along the intended pivot axis 6, which can exhibit an end stop 8 so arranged as to prevent the pivot shaft 7 from being pushed completely through the aforementioned bearing attachments 4, 5, 5 held together by the pivot shaft 7. For this purpose Qip cf ^~*^~^Θ be ino ^^^ ^^_^D^^Q Δ ^ i _° ^ ^_^^^ ^t beino divided in its axial direction 9, 10, namely the bearing attachment 5. In the example shown here, the aforementioned pivot shaft 7 is lockable in the axial sense by means of a j_GCrimg coiupon n i .

The axial forces which act on the shaft 7 will push out the shaft 7. What prevents this is a mechanical contact between the recess 8 of the shaft and a corresponding radius in the bearing part 5^' of the ramp or a siαe washer. Axial forces are prevented in this way from passing through the weld of the locking plate, whereby the risk of overstreεsing the weld of the locking plate is minimized. This results in the locking block 11 or the locking plate not failing off because cf axial forces.

A hinge pivot 1 is preferably arranged on each side part of the ramp 2, and hook-like engageabie pivot supports (not illustrated^ are provided between these two hinge pivots 1 so Ln L J.- _Ls

i GU GΓ hinge pivots 1 during assembly and disassembly of the ramp 2.

The aforementioned bearing attachments 4, 5, 5 are m the form cf sheet-like flanges which are provided in pairs 5, 5' and individually 4 with transcurrent central openings 12, 13, 14 to accommodate the aforementioned pivot shaft 7. The aforementioned dividable bearing attachment is in the form of a cover 15 provided with a hole, which is so arranged as to be screwed to one 5 of the aforementioned '^o bearing attachments 5, 5^J . The cover 15 exhibits a thickened part 17 situated on one side A of a sheet-like component 16 and projecting axially 10 from the aforementioned sheet-like component ID, which thickened part is accommodated in a centrally located hole 18 in one 5 of the aforementioned pairs of bearing attachments 5, 5¹. Seals in the form of o- rings 19, 20 are accommodated in annular grooves 21, 22 in the aforementioned cover 15.

locked to the aforementioned single bearing component 5 by means of screws 23 in such a way as to prevent its rotation, which screws are accommodated in smooth transcurrent holes 24 in the cover 15 and in threaded holes 25 in the bearing component 5. An attachable grip handle 26 is attached in a preferably detachable fashion to the pivot shaft 7 via a threaded component 27, 23 in the handle 26 and in the pivot shaft 7.

To permit easy release and removal of the aforementioned cover 15, a number of transcurrent axially threaded holes 29 is distributed around the periphery of the cover and extends all the way through the cover 15 as far as a smooth ^ rt cf the associated attachable single bearing component 5. The aforementioned threads 25 are so arranged as to engage with the threads 31 on the securing screw 23, which locks the cover 15 securely to the aforementioned bearing

by screwinq in the screws 23 previously unscrewed for the purpose axially 10 into the aforementioned threaded holes 29, the cover 15 is pressed in an axial direction 9 away from the bearing component 5 so that its centrally located thickened part l^"7 is drawn from the associated accommodating hole 18 in the aforementioned bearing component 5. The alorementioned end stop 8 in the pivot shaft / is in the form of the recess 30 in the inner end 31A of a part 31 of he pivot shaft 7 tapering in a direction away from one end 7A of the pivot shaft. A locking component 11, for example in the form of a square flat block, is capable of being accommodated in a matching siot-snapeα transverse groove 32 on tne pivot shaft 7, and the aforementioned locking component 11 can also be secured against falling out, for example by spot-welding it securely to one of the locking components 51.

Finally, it must be stated that the pivot shaft 7

able to supply lubricant to components mounted on the pivot shaft 7, and that grease nipples 33A-35A close them off at their respective open end.

Arranged between the centrally located bearing component 4 and the two laterally located bearing components 5, 5 is a number of spacer rings 36-39, of which two are secured to a bearing component 40 with the help of spring

v-shaped sealing rings 43, 44 are also arranged between pairs cf spacer rings 36, 37 and 38, 39, and a sealing o-ring 45, 46 is accommodated in inward-facing annular grooves 47, 48 in two of the aforementioned spacer

. alonc the pivot shaft 7.

The sealing rings 43, 44 are so arranged as to act each in its own space 49, 50, which exhibits free play of

/ and 36 , 39.

The invention should have been appreciated from the above description and specification, but it is net restricted in that respect and may be varied within tne scope of the Patent Claims without deoartinσ from the idea of invention. The invention also makes it possible to reduce the axial forces through the bearing by releasing the axial moment and causing the bearing to move freely m the longitudinal sense along the shaft 7, which is achieved by the use of larger tolerances and grease. The axial force between the vessel and the ramp is located at a point in such a way that the axial force is transferred directly between the bearing attachments 5, 5^] of the ramp and the bearing attachment 4 of the vessel. The bearing attachment 4 can also be double.

Claims

K73 P18PCT LG/KOE

r t e n t C a 1 m s

5 1. Hinge pivot (1) for vessel ramps (2) and similar pivotally mounted hatches, characterized in that bearing attachments (4, 5, 5 ) connected to one another and attached respectively to the frame ( 3 ^ and the ramp (2) of the vessel and provided with holes are held together by means of a pivot 0 shaft (7) extending along the intended pivot axis (6), and in that one of the bearing attachments (5, 5^{1 ]} is capable of

with which the aforementioned dividable bearing attachment (5) is m tne form of a cover (15) provided with holes which 5 is so arranged as to be screwed to one (5) of the aforementioned bearing attachments (5, 5¹ .

2. Hinge pivot m accordance with Patent Claim 1, characterized In that the bearing attachments (4, 3, 5 ) are m the form of sheet-like flanges (4; 5, 5 ) provided m 0 pairs and/or individually with transcurrent central openings

( j I T , J-^J- LIIC j-u -tilien iOiic^ -L ^ L. biicij- L \ _/ .

3. Hinge pivot m accordance with one or other of Patent Claims 1-2, characterized in that the cover (15) exhibits a thickened part (I^"7) projecting on one side (A), 5 wnicn is accommodateα in a centrally located no e do) m one of the aforementioned pair of bearing attachments (5, 5 ) .

4. Hinge pivot in accordance with Patent Claim 3, characterized m that the cover (15) is capable of being locked m such a way as to prevent its rotation by means of o< screvS _ 3, O iiS j-C K.1v_lOnθCi S iiQ Θ oβ ixiQ cGmpjnent (5) accommodated m smooth holes (24) in the cover.

5. Hinge pivot m accordance with Patent Claim 4, characterized in that an attachable grip handle (26) is attached in a preferably detachable fashion to the pivot ^ <=h^aft < ^π ^

6. Hinge pivot in accordance with Patent Claims 4-5, characterized in that threaded holes (29^ are distributed around the periphery of the cover and extend ail the way through tne cover (15) . 5

7. Hinge pivot in accordance with one or other of Patent Claims 1-6, characterized in that the aforementioned pivot shaft (7) exhibits an end stop (3> which prevents the pivot shaft C \ from being pushed through the combined bearing attachments (4, 5, 5 ) . 10

8. Hinge pivot m accordance with Patent Claim 7, characterized in that the end stop ( 6 on the pivot shaft ( ^~" is in tne rorm or tne recess IJU'J in tne inner enu

or a taoerino oart (31 ^ of the oi^ct shaft (i\

9. Hinge pivot in accordance with one cr other of

15 Patent Claims 1-6, characterized in that the pivot shaft (7) includes a number of supply channels (33-35 for lubricant to coinponenL.s moun ed on the ριvo _. snάxt i, 1.

10. Hinge pivot in accordance with one or other of Patent Claims 1-9, characterized in that the pivot shaft (7)

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component ill) .

1 1 P¹ nα i C 1 ~>

characterized in that a locking component (11) in the form of a block is capable of being accommodated m a slot-shaped 25 transverse groove (32 i on the pivct shaft C ) .