US1578583A - Davit - Google Patents

Description

.March 30,1926. -1,578,583

fl. CEELE-N nAvvIT Filed July 14, 1923V Patented Mar. 30, 119.26.. Y

i JAN CEELEN,` OF yEZO'ITEltDAll'.,f NETHERLANDS, ASSGNOR ATO ROTTERDAMS-CHE 'MACHINEEAERIEK BRAATL or ROTTERDAM, NETHERLANDS, A COMPANY 0E NETHERLANDS.

Application filed July 14, 192,3. SeriaxlNo. 651,641.

T 0 Vall, whom. izimag/ concern.'

Be it known thaty l', JAN` CEELEN, a subject of the Queen ot the Netherlands', residing at Rotterdam, Netherlands, have invented certain new and useful Improvements in Davits, of which the following` is specification. The present invention relates to a boat davit adapted to automatically swing outwardly when the falls are payed out, and it has for its principal 'object to design a davit -of therabove type that is of simple, light and comparatively low construction, reliableyin operation and readily swings the boat outboard' clear of the ships side.

VThe novel davit consists of a standard` terminating at its lower yend in a curved sur face adapted to roll on a traelrway inclined downwardly towards the ships side, the arrangement being so that the davit accomplishes a eanting movement after having completed its roll on the traekway. y The centre of said Vcanting motion may be located close to the ships side. Owing to this arrangement the davit top, which initially moves at a relatively small distance from deck, distance for the boat to completely clear the side of the ship. Arresting stops provided in the centre of canting motion and elsewhere on the davit frame ensure the required stability of the davit when completely swung outboard.

The davit may bev operated in a simple mannerby lmeans of the .boat fall which, in accordance with another feature of this invention, may be passed over a pulley or another suitable guiding means at orneark that endet-the rolling surface of the standard, which ascends during the lufiing' motion of the davit. Owing to its tension the yfall exerts a certain pressure on the said pulley and thereby maintains the correct relation.

between the standard and the frame which accommodates it. Y

The annexedy drawing illustrates, by way of example only, an embodiment of the present invention, Figure 1 being an end view, and Figure 2 a side view thereof.

The boat 3 is suspended from blocks t and 5, roven through which are the falls@ and 7 operated by a common winch 8. A beam 9, which may be of tubular forcan be swung outwardly a sufficientv mation, is at reither end secured to a standard 10y terminatingA atV its lower end ina whereby it is adaptedto roll on an outwardly inclined tracliway 12 of a frame 13 secured to deck. The centre of curvature ofthe rolling surface isfpreferably located 'foot having acurved` rollingsurface 1,1A

inthe beam 9, so that during the rolling j motion kof the standards 'on the traekways 12 said beam moves through a rectilinear path in parallelrelation with the traclways. The foot 11 is"provided near its outer end with an idler 14 for guiding the boat fall,

l,frame 13. 'Roller 15,evnsures that during-the 'its other end being equipped with an antilufiing. motion of the Vdavit the foot 11 can only roll and preventsy slidingfmovement thereof. `Afterv the foot 1l has completed its Troll on the 'traclrw'ay 12 the standard Vvstarts to-'cant with theaxis of roller -15 as a centre,`and when the standard 10 finally assumes the position indicated inflTigure 1` by a chainfline itis arrested by its cross pin 17 .abutting against the frame 13, whereby. the davit is heldin a perfectly stable position. r

The beamv 9' is provided with hooks 18 and 19 which, in the position of the davit as illustrated in Figure 2, project into recesses of the blocks A1v and k5, respectively. These hooks prevent the boatjfrom descending, prior to the outward swing of the davit, when the fallsare payed out. 4vAs soon, however, as beamr9. has reached a predetermined point of its path, for instance, the point 20,

Vthe momentsy of the forces are .so that the lblocks 4L and 5 haveno `longer av tendency to move away from thedavit when` the latl lter continuesits luing movement. Beyond' said point 2O the hooks may safely release the blocks. f Then assuming position 71 (Figure 1) the falls act onv along lever arm owing to their being passed over pulleys le, so that they are never unfavorably loaded. When the boatis being raised the falls mustk temporarily take up part of lthe weight of the davit in additionto'the weight ofthe sel boat, so that the falls andthe winch mustV l be dimensioned accordingly. n A

The boat checks `have vnot'been shown on the drawing. As a matter of course said les" ' that such locking meansmay not inthe leastv checks must be collapsed or `Otherwise removed from under the boaty before the latter can be swung` out. Y p Y 'The drawing,I neither shows how' the frames could be provided with latehestor .sustaining the standards, for instance vertically below the rolls 15, soA long as the boat falls have not yet been properly roven or tightened. These latches or other locking; means could suitablybe associatedwith the boat chocls in such a manner as to auto` matically release the davit when the boat checks are collapsed. Anyway itis obvious interfere with the swing of the boat. y

rl'he boat, falls can be f tightened by Astretching screws to ensure that the standards properly move intheir lframes andno jamming` can occur. y

As the standards are rguided in a simple manner in open frames it is practically impossible for their proper operation to be' im,- paired. t desired the rolling movement can take place on blunt knife edges whereby ice that may accumulate thereon is readily crushed and cleared away.

That I 'claim is v v l. A boat davit comprising an outwardly inclined stationary track-way, aboat tackle supporting" standard having a curved portion .supported on and normally occupying a position adjacent the upperfend of the inclined track-way and adapted to roll downwardly thereon, said standard being adapted, subsequent to its rollingl movement, to swing outwardly on an axis coincidingl with one end ot the curved portion thereof, stops arrangedto arrestthe outward swinging,l movement of the standard, a boat fall, a windlass having the boat, 'tall attached thereto and secu-redto a xed part of the ship, and means adjacent .the opposite end ot saidV curved portion for guiding the boat fall during the upward movement ofthe last mentioned e11d,"the tension of thef'hoat fall acting against thel guiding ymeans producing an outwardly.directed -torce against and tending- 1 to maintain the standard in outboard position.

2. A boatrdavit as claimed in Vclaim l, characterized by the'provision of ya rela# tively stationary guideway,V vand a friction reducing member carried by the first mentioned end of the curved portion ofV the standard adapted tomove along theguideway. during the rolling movement oit' ysaid standard' to prevent the latter from sliding over ythe track-way. f i y In testimony whereof affix my signature. y

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