US1173821A - Ship's davit. - Google Patents

Description

W. LUEDER.

SHIP'S DAVlT.

APPLICATION FILED JUNE 10. 1915.

1,178,821 Patented Feb.29,1916.

3 SHEETS- SHEET l- WITNESSES: INVENTOR.

ATTORNEY.

THE COLUMBIA PLANOGRAPH co.. WASHINGTON, D. c.

W/LL/FIM AL/EUER W. LUEDER.

SHIPS DAVIT. APPLICATION HLEDIJUNE 10, 1915.

lNVE/V TOR. WILL/Fl M LUEDEFL WIT/V 5 5.-

THE COLUMBIA PLANOGRAPH cm, WASHINGTON, D C.

piairnn STATES PATENT orrreia WILLIAM LUEDER, OF SAN FRANCISCO, CALIFORNIA.

SHIPS DAVIT.

To all whom it may concern Be it known that I, W'ILLIAM LUEDER, a subject of the Emperor of Germany, residing at 363 Second avenue, San Francisco, in the county of San Francisco, State of California, have invented a. new and useful,

Ships Davit, of which the following is a specification in such full and clear terms as will enable those skilled in the art to construct and use the same. 7 A

This invention relates to a davit for ships and one of the objects of the invention is to provide means whereby a series of davits may be operated all at once to swing the boats clear of the ship in time of necessity, separate means being provided for lowering each boat of the entire series operated by the swinging mechanism.

Another object of the invention is to provide means whereby the lashings of each boat will be released at the same time when the davits start to swing out from the ship.

Another object of the invention is to provide automatic means for retarding the lowering of the boat thereby preventing accidents due to too rapid lowering of the boats into the sea, separate means being provided for manually stopping the descent of the boat should that be required at any time.

In the drawings, in which the same reference numeral is applied to the same portion throughout the several views, there is shown one embodiment of the invention, although there may be many modifications thereof.

Figure 1 is a view in section of a portion of the boat deck of a ship having this davit applied thereto and showing a diagrammatic view of life boat in place, Fig. 2 is a plan view of the parts shown in Fig. 1 with the false deck removed for purposes of illustration, Fig. 3 is a longitudinal view of the boat and davit the ship deck being in sec tion, and Fig. 4 is a detail partly in section showing the brakes.

The numeral 1 illustrates the hull of th ship, 2 indicating the deck of the ship on which the davits 3 and 4 are supported. The davits are stepped in suitable bearings in the deck 2 as indicated at 4 and 5, the davit 3 having a segment worm gear 6 and the davit 4 having a worm gear 7, each of said gears being adjacent the bearings for the davits. Above the said gears there is a false deck 9 supported on stringers 10 and 11. Extending through the false deck are Specification of Letters Patent.

Application filed June 10, 1915.

Patented Feb. 29, 1916.

Serial No. 33,292.

two chock blocks12 and 13 for the support of the boat, the boat keel being held against said chock blocks by means of the movable chocks l4 and 15 which are pivoted in bearings l6 and 17 on the main deck 2. Extending along the deck of the ship is a shaft 18, said shaft serving such a number of boats as it may be desired to be applied to and receiving power from any suitable source, not shown. The shaft 18 has four bearings 19, 20, 21 and 22 and it is provided with two worms 23 and 24, the formersliclable on a feather 25, a collar 26 on the shaft preventing said worm 23 from moving to the left with respect to said shaft any more than it is shown in Fig. 2. The gear 7 has a shoulder 27 projecting into the hole at its center, which shoulder is intended to meet a cam 28 on the side of the davit 4 when the gear has rotated to the left the same amount as the gear 6 has. rotated to the right, see Fig. 2. The gear 7 is only connected with the davit 4 when its shoulder 27 contacts with the cam 28 and it is used both to force the davit 4 to the left after reaching the outboard position, as well as to pull the davit 3 to the right when reaching its ultimate travel, the worm 23 at that time being moved along the feather 25.

The worm 24 is rigidly connected with the shaft 18 and continuously rotates the gear 7 until the davit arm 4 turns as much as may be necessary to swing the boat over the side of the ship, but the worm 23 is slidable on the shaft 18 so that as the davit arm 4 is rotating from the position in which it is pointing directly toward the gear 6 it draws the davit arm 3 to the right, Fig. 2, at which time the worm 23 moves along the shaft 18, such an amount as it may be necessary to allow the arm 4 to move to the desired position, the letters A, A, B, B, C, C indicating the successive positions of the davit arms in moving from the inboard to the outboard .positions. Below the false deck 9 and on the main deck 2 are mounted guide blocks 30-313233 for 2 slidable bars 35-36. Each of the slidable bars is provided with a series of rack teeth which teeth are in engagement with pinions 3738 on the shaft 18. Each of the rack bars is also provided with two hooks as indicated at 39 and 40, said hooks being for the purpose of holding the links 4142 connecting with the lashing cables 43-44, which cables have hooks 45 and 46 passing over the gunwale of the boat B There are a pair of the lashing cables and hooks at each end of the boat. In order to hold the teeth on the bars 3536 in engagement with pinions operating tli eni each of the bearing blocks 20 21 for the shaft 18 has a bracket H on its side, one bracket for each of the bars 35-86.

Mounted on the deck inboard from the life boat is a shaft e8, said shaft having suitable journal bearings bolted to the deck and carrying drums 49-50 for the cables 5l52, said cables passing over pulleys 53 at the top of the davit arms, 54: at the center of the curve thereof, 55 at the top of the straight portion thereof, and 56 on the'deck 1. The shaft l8 is provided with a large pinion 58 in mesh with a small pinion 5-9 on the shaft of the motor 'Mand said motor being controlled from the switch box 60.

In orderto provide automatic'm'eans for preventing the boats'from being lowered too rapidly the shaft 61 of'the motor is extended far enough to carry the governor arm 62'63 which arms are connected with a collar 6% which collar is connected by asuitable' linkage to a vertical shaft 65 havingan arm 66 connected to a band brake 67, which bears on the bottom of the brake wheel 68. The shaft 61 is also provided with a brake wheel 69 around which passes the brake'band 'i'O operated by means of the'hand lever7l to enable the person-"lowering the boat "to stop the" same Whenever necessary the segment rack 7 2 providing means by' which the brake may be left set at any desired point. i

The operation of the davit is as follows: WVhen the bc-at'is to be lowered the shaft l8 is rctate'd. This first'releases the boat lashings and the chocks by moving'the bars; 35, 36 longitudinally, the gears moving said bars only a short-distance. The shaft con tinues'to rotate and as it does sopositively drives the gear 6 until the davits'assu-me the position A A".' The davit in'theposition A then is met by the cam27 and along with the other davit is positively rotated clockwise. The davit 4 ispositively rotated something over 200 degrees. lVhen" the davits assume the positions B B it is necessary for the davit d'to ro-tate about degrees, but the davit 3 may then beb'acked up because the gear 23 is freetoslide to the right on the shaft 18, but that davit will not move as much as'the other one since some ofthe motion is lost by reason of the supporting ropes inclining in certain of the positions. When the boat has been swung out from the ship the motor or other hoisting apparatus may be operated to raise the boat, or, if the boat is to be lowered, it may be accomplished "by operating the brake alone. i

Having thus disclosed my inventicn,what

I desire to secure by Letters Patent of the- United States, is as follows, modifications Within thescope of the claims being expressly reserved:

"1. A life boat handling apparatus com prising the combination with a support for the boat, of lashing lines and chrc'ks for the boat, a pair of ships davits to which supporting cables from each end of the boat extend, a shaft extending to both of the supporting cables from each end of the boat extend, a' shaft extending to both of the davits, a slidable Worm and a fixed worm on said shaft, agear on each davit in mesh with said-'worms whereby the davits may betur'ned outboard, a pair of slides for holding the lashings and chocks, a pair of to release the lashings and'chocks, drums over which the boat cables pass from the daVits',"-and a manually operated brake for retarding'the descent of the boat.

'pinions onthe shaft for moving said bars In testimony whereof I have hereunto'set myhandthis' 28 day of May A. D1915, in the presence of the two subscribedwitnesses. a p 'WILLIAM LUEDER Witnesses:

C. P. GRIFFIN, HENRY B. LESTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

I Washington, D. C.

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