US1323734A - Device for lowering of life boats and the like - Google Patents

Description

J. BERGH.-

DEVICE FOR LOWERING OF LIFE BOATS AND THE LIKE.

APPLICATION FILED MAY15, 1918.

1,323,734. Patented Dec. 2, 1919.

2 SHEETS-$HEET I- J. BERGH.

DEVICE FOR LOWERING OF LIFE BOATS AND THE LIKE.

APPLICATION FILED MAY15, 1918.

1 323 734. Patented Dec. 2, 1919.

2 SHEETS-SHEET 2- FFIC JENS BERGI-I, OF DEAMMEN, NORWAY.

DEVICE FOR LOWERING 0F LIFE-BOATS AND THE LIKE.

Specification of Letters Patent.

Patented Dec. 2 1919.

Application filed May 15, 1918. Serial No; 234,774.

To all whom it may concern:

Be it known that 1. Jews BERGH, a subject of the King of Norway, residing at Drammen, Norway, have invented certain new and useful Improvements in and Relating to Devices for Lowering of Life-Boats and the like, of which the following is a specification.

This invention relates to devices for lowering and hoistinglife boats and the like in connection with a ship so that when desired they may be lowered into the water or raised from the water and drawn inboard.

The object of the invention is a form of apparatus of this character in which, when the chocks or other devices for supporting the boat are removed, the boat isadapted,

owing to its own weight, by means of the;

davits to be swung automatically outboard, and wherein the lowering and the regulation of the speed at which the boat is lowered iscontrolled entirely from the boat.

Another object of the invention is the provision of means for hoisting up the boat so that it can be replaced on board. for stance after a trial lowering or on any oil?- occasion.

Reference will now be made to the accompanying drawings which illustrate one embodiment of an apparatus constructed ac-" cording to the invention, and in which,

Figure l is a side view of one of the davits and the means for lowering the boat which is shown as being supported by the davit.

Fig. 2 is a View of the same device as seen from the right hand of Fig. 1.

Fig. 3 is a sectional view partly in eleva tionthrough the braking apparatus and the means that are used for releasing the boat from the wire or rope by means of which the boat is suspended from the davits.

Fig. 4 is an end view of Fig. 3, and

Fig. 5 is a sectional view on a line taken through the releasing apparatus when the parts are in gripping or engaged position.

In carrying the invention into efi'ect the davits of which, as usual,-two for each boat are employed, are each mounted in a frame 1, which in any suitable manner is secured to the deck with the davits pivoted'on a journal or axle 2 in the upper end of each The davits are each i arranged upon a shaft 10 and-thisv is sup;

of the said frames.

formed as a double crank lever, the part 4:

of which is slotted as at 5, in which the journal or axle 2 is guided or engaged. The

outerpa'rt 6 of the crank lever is angular and forms a shoulder 7 which isadapted, dur ng the lowering of the boat to bear against the frame 1. The upper end of the part 6 is suitably for the purpose provided with rollers 8 and 9 or the like. The length of the different parts of the davit in combination with the arrangement of the said davit on-the deck, are'so selected-that during lowering, the boat will pass clear of the side of the ship.

The device acts in the following manner: When the boat is manned the chocksare removed as usual, whereupon the weight of the boat will act on the davit through the wire or rope which will accordingly be unwound from the roller 13 and wound upon a roller 12, the braking apparatus in the boat being in advance so adjusted as to give any suitable or desired speed-for lowering. The dav-its at the same time will swing upon the journal or axle 2 until the shoulder 7 comes into contact with the frame 1, whereupon the journal 2 will serve as a guide to the movingpart 4: of the davit, then moving relatively by means of its slot 5 to the journal 2 until the upper part of the davit has reached anormal horizontal position, as in dicated in dotted lines. During these two movements of the davit, the roller 32, sliding ring 34, and theroller 31 are rotated and their method of operation is hereinafter described. The objectof the two movements of the davit as above described is to insure that the boat in swingingoutboard and being lowered will not contact with the side of the ship.

At each end of the boat the lowering device together with the davit are provided and these lowering devices principally consist in a roller system which is hereinafter described and are arranged upon a shaft 10, which in a known manner, by means of a clutch deviceor the like is connected with a driving device such a motor or the like (not shown in thedrawings), and the saidmotor which is to be used only for the hoisting of the boat is preferably placed between two boats, arranged end to end so that it can be connected to each of the shafts of the respective lowering devices for each of the boats.

As before mentioned, the roller system is ported by bearingsll, arranged upon the deck or at any other convenient part ofthe ship. The bearings are arranged-preferably differential diameters'ofthe rollers 12 and two on each side of each roll system, and one in the middle between the roll systems. Each of these comprise the rollers 12 and 13 which are keyed upon the shaft 10, the diameter of the said rollers being so arranged that the weight of the boat, owing to their difference in size will efi'ect the desired action of lowering the boat. Around these rollers 12 and 13, there is wound a wire the ends of which are attached to the rollers 12 and 13 respectively. The wire runs from the roller 12, over the roller 8 at the top of the davit, and from thencedown to the roller 14 in the braking apparatus which is mounted in one end of the boat. From the roller 14: the wire then passes back to thesecond roller 9 at the top of the davit and finally, tothesecond roller 13 to which the other end of the wire is attached.

When the boat is disconnected or unshipped so as to hang in the davits and upon the wire by means of its whole weight, the

13 will effect the lowering of the boat, the larger roller 12 unwinding much more wire for each revolution than can be wound upon the smaller roller 13. During this operation 7 the motor'above referred to is disconnected boat from the braking apparatus after it since as before stated, this motor is only used for hoisting the boat inboard.

The speed at which lowering occurs can be regulated from the boat by means of a braking apparatus, see Fig. 3, which comprises a grooved roller 14,-around which passes the wireor rope from the rollers 12 and 13. The latter is adapted to pass'twice' between metal blocks 15, 16 and 17 arranged a short distance above the roller 14 and i has reached the water the braking apparatus is fitted with a special releasing device mounted on the boat. As is well known an ordinary hook isused for releasing theboat,

. but as it is diflicult to-obtaingthe'necessaiy slack on the wire by which the boat is suspended, and as it is very important that the boat shall be releasedjust as quickly as pos sible,.a modified arrangement has been designed for efi'ecting this purpose and which will now be described. The releasing apparatus comprises two'parts of which'one part as mentioned, is mounted on or attached to the boat and the other part is attached to and formed as one piece together with the braking apparatus. As is seen in Fig. 3 the part which is attached to the boat, consists of an angular arm 20, one end'of which in a suitable manner is attached to the end of the boat, the other end 21 of the said arm being provided with the part 2 1, that can be rotated by means of a handle 22 and which is provided with a stop 23. The hori zontal part 21 and the end of the upper arm 20 is designed to engage with avcylindrical opening in the other part of the releasing apparatus and the stop 23 engages: with a hole 27' in the casing 28 which is placed in the opening 26 so that it can be rotated; The casing is guided by'two bolts 29. When the stop 23 is placed in the hole 27 and the handle 22 is rotated so that the hole 27 will be in its lowest position, the releasing device will be locked and the handle 22 can be held in its position by any suitable means.

It will be understood that it is only nec- V essary to use one of the braking devices in the boat as all of the rollers of the same boat are mounted upon a common shaft.

When the boat is to be hoisted the shaft 10 is, connected to the motor which is not herein shown. The boat is then hoisted in such a way that the wire which is attached to the boat is wound around the larger roller 13 and at the same time unwound from the smaller roller 12. The hoisting in this manner takes place until the lower arm 6 of the davit is swung up. By means of a clutch device 30 in this manner the roller 31, which slides on the shaft 10 and on which a wire 31 is running, is connected. One end of this wire 31 is attached to the said roller and its other end is passed through a pur- 100 chase-block on the deck and attached at a suitable point, for instance, at the point i on the moving part of the davit; On the shaft 10 there is however provided a keyed roller 32 which is grooved circumferentially. Between the rollers last mentioned a sliding ring 3a is provided, to a projection 35 on which there is attached one end of a wire 31 which is hooked in the groove 33 and wound upon the roller 32. The other end of this wire 31- passes through a purchase block and is attached at a suitable point, for; iinstance, the point 3 of a moving part of the avit; i i

'VVhen the clutch device 30 is brought or moved into engaging position the slot 5 in the part 4 of the davit will slide on the j ourv nal 2 owing to the drawing power in the wire 31 attached at -the point 3; The shoulder 7 will thereupon act as a center of r'otation, and slack in the wire which is attached to the sliding ringis thereby obtained, whereupon this wire is hooked in the groove 5 '33 in the ring 32, which roller at first cooperates with the hoisting and then effects the last part of this movement alone; During the final swing of the davit by which the journal 2 serves as a center of rotation the sliding roller 31 must be disconnected so that it shall not prevent the movement, The'boat is now in its proper place inboardand the chocks can be placed underneath it asusual. The proper moment for the connecting in of the roller 31 can be marked, for instance by an easily perceptible mark or device on the wire for'the rollers 12 and 13.

During the lowering of the boat the roller 32 rotates togetherwith the shaft whereby all the wire will be wound off the said roller. Then the wire slips out of the groove while the ring 34 continues sliding on the shaft and it is of no consequence whether the roller 31 is connected to the shaft or not. During this movement the davit consequently is lowered to its lowest position, the shoulder 7 bearing against the davit frame.

What Ivclaim is: I

1. Apparatus for lowering and hoisting life-boats comprising in combination a pair of davits, each formed as a double armed lever one arm of which is slotted, a frame for supporting each davit, a journal or axle on the frame constituting a fulcrum for each double armed lever, a projecting knee portion on the other arm of the double armed lever adapted to bear against the frame so that the davit may in its movement first swing upon its fulcrum as a center of rotation and afterward swing upon its projecting knee as a second center of rotation, a means for suspending the boat in the davits and means for lowering and hoisting the boat from the davits. I

2. Apparatus for lowering and hoisting life boats comprising in combination a pair of davits each formed as a double armed lever one arm of which is slotted, a frame for supporting each davit, a journal or axle on the frame constituting a fulcrum for each double armed lever, a projecting knee portion on the other arm of the double armed lever adapted to bear against the frame so that the davit may in its movement first swing upon its fulcrum as a center of rotation and afterward swing upon its projecting knee as a second center of rotation, wires for suspending a boat from the davits a large and a small roller on the ship to which the respective ends of the wires are attached and means on the boat and on the davits over which the intermediate parts of the wires are passed, so that upon lowering the boat the wire iswound from the large roller and wound upon the smaller roller.

'3. Apparatus for lowering and hoisting life boats comprising in combination a pair ofdavits, each formed as a double armed lever one arm of which is slotted, a frame for supporting each davit, a journal or axle on the frame constituting a fulcrum for each double armed lever,-a projecting knee portion on the other arm of the double armed lever adapted to bear against the frame so that the davit may in its movement first swing upon its fulcrum as a ccnterof rotation and afterward swing upon its'projecting knee as a second center of rotation, wires for suspending a boat from tl18-(lt"ll$ a large and a small second roller on the ship to which the respective ends of the wires are attached, means on the boat and on the davits' over which the intermediate parts of the wires are. passed sothat upon lowering the boat the wire is wound from the larger roller and wound upon the smaller roller, and a braking. device on the boat for controlling the lowering of the boat and its speed.

4:. Apparatus for lowering and hoisting life boats comprising in combination a pair of davits each formed as a double armed lever one arm of which is slotted, a frame for supporting each davit, ajournal or axle on the frame constituting a fulcrum for each double armed lever, a projecting knee portion on the other arm of the double armed lever adapted to bear against the frame so that the davit may in its movement first swing upon its fulcrum as a center of rotation and afterward swing upon its projecting knee as a second center of rotation, wires for suspending a'boat from the davits a large and a small second roller on the ship to which the respective ends of the wires are attached, means on the boat and on the davits over which the intermediate parts of the wires are passed so that upon lowering the boat the wire is wound from the larger roller and wound upon the smaller roller,

and means for readily releasing the boat from the suspending wires when lowered.

5. Apparatus for lowering and hoisting life boats comprising in combination a pair of davits each formed as a double armed lever one arm of which is slotted, a frame for supporting each davit, a journal or axle on the frame constituting a fulcrum for each double armed lever, a projecting knee portion on the other arm of the double armed lever adapted to bear against the frame so that the davit may in its movement first swing upon its fulcrum as a center of rotation and afterward swmgupon its pro ecting knee as a second center of rotation, wires for suspending both ends of the boat from the davits, a pair of large and small winding rollers on the ship to which the ends of the respective wires are fastened, a grooved roller detachably mounted at each end of the boat to receive the intermediate portion of each wire, and means mounted in the boat at the ends thereof for exerting a braking pressure on the wires.

6. Apparatus for lowerin life boats comprising in com iination a pair of davits each formed as a double armed 1e ver one arm of which is slotted, a frame for supporting'each davit, a journal or axle on 'the frame constituting a fulcrum for each and hoisting double armed lever, a projecting knee portion on the other arm of the double armed lever adapted to bear against the frame so that the davit may in its movement first swing upon its fulcrum as a center of rotation and afterward swing upon its projecting knee as a second center of rotation, wires for suspending a boat from the clavits a large and a small second roller on the ship to which the respective ends of the wires are attached, means on the boat and on the davits over which the intermediate parts of the wires are passed so that upon lowering the boat the wire is wound from the large roller and wound upon the smaller roller, a

braking device on the boat for controlling the lowering thereof and its speed and means for releasing the boat when lowered, the upper part of the releasing device being constructed in one withthe said braking device.

v 7. Apparatus for the purpose described are fastened, means whereby the boat is.

lowered by differentially winding and unwinding the wires, a power operated wind ing device, cables extending therefrom to one end of the pivoted davit and anchored at the other end, means whereby the power operated winding device raises the boat, which device may be clutched to, the power drive when it is desired to cause the-ClitVltS to pivot on their fulcra for the purpose of drawlng the boat inboard when it is'raised'.

sufficiently.

In testimony whereof I have signed my name to this specification.

Jens Barren.

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