US72170A - Improvement in boat-loweriig apparatus - Google Patents

Description

@with if tut @fitta l B E R il C H- E U Z B A U R, O F. N'E W Y'O R K, N. Y.

letters Patent IVO. 72,170, dated .December 17, 18.67.

IMPROVMEN'I IN BOAT-LOWERING APPARATUS.

TO ALL WHOM IT MAY CONCERN:v

Be it known that 1, ROBERT CREUZBAUR, of NewYork city, iu the Vcounty -and Sta-te of New York, 'have invented an Apparatus for Lowering andIicking up Boats and I do hereby declare that the following'is aftill," clear, and exact description thereof, reference being had to the accompanying drawings, making a.l part of this specification, in which-' Figure 1, sheet 1, is a vertical sectional` view of a portion ofa deck, and one side of a ship, showingfin side elevation, the application thereto of the improved boat-lowering and picking-up apparatus.

Figure 2, sheet 1, is asimilar view of the same parts shown in iig. 1, indicating the davits `iu the act of raising or lowering a boat'.

Figure 3 is a vertical diametrical section through oneof the davitfsprings, enlarged. v

Figure 4, sheet 2, is a top view of fig. 2.

Figure 5, sheet 2, is a View, partly in section, oi' the upper portion of'one of the davits.

Similar letters of reference indicate corresponding parts in the several figures.

The object of this 4invention is to overcome the dangers and difficulties incident to the raising, lowering, and casting olf of ships boats, 'and to render access to and from a boat comparatively safe. Under the old mode of constructing and arranging the davits from which ships" boats are suspended and lowered, the boats are necessarily brought so near the side of the vessel, that even under ordinaryswells 'of the sca there is great danger of having the boats dashed against the vessel, and capsizedor crushed.

To avoid these accidents, the nature of my invention consists in so constructing the davits and applying them to a vessel, that they shall have a free swinging motion toward and from thewator, and at the same time admit of being turned around like u crane when theyarc in upright positions, so that when the bout is not in immediate use, it can be swung inward gver the deck of the vessel vand lashed fast, as will be hereinafter described.

l The invention also consists in the application of springs, or other equivalent means, to davits whichare allowed to have a vertically-swinging motion toward and from the water, iu such manner that the tendency of the davits shall always be to 'assume upright positions when unrestrained by the weightof the boat; thus, when a bont is launched, but, moored to the davits, rises upon aware, the davits will also rise, and thus prevent col-A.'

lision and injury to passengers in the boat, as will be hereinafter described.

To enable others skilled in the art to understand my invention, I will proceed to describe one practical mode of carrying it into effect; y

In the accompanying drawings, A A represents two hinged or`pvoted davits, which are attached to 'the outside of the vessel by means of pins, a a, or in any other suitable manner which will admit of the davits being vibrated in vertical planes at right angles to the length of the vessel, as indicated by the two positions shown in figs. 1 and 2. These davits are hinged or pivoted separatelyto the vessels side, so that they may have indepen lentn1overncnts of each other, or rise and descend in the are of a circle together.

Thedrawings represent the lower ends of the davits forked, and pivoted to brackets, which are rigidly fastened to the vessel outside; but it is not contemplated to confine the invention to this peculiar attachment,`

as other ulodes'of hinging the davits may he adopted. lhe forked ends of 'the davits serve to brace and strengthen them, and prevent vibra-tion and undue strain in a direction with the-length of thc vessel.` The upper ends of the standards or straight portions of the ,davits A A are constructed with sockets in them, in which screw-threads are formed, for receiving the;` screw-threaded lower ends of the curved overhanging portions of the davits, from which the boat B' is suspended. This mode of constructing tho davits will al'lo'w ofthe swinging of their curved top portions or sections, with boat attached, inward or over the deck of the vessel, as indicated by red lines in fig.,1, in which 'figure the curved portions of the davits are also represented as turned outward. At the extremity of the curved part ofeach davit is a' pulley, P, over which the suspending-rope R works, and upon which this rope is safely held by the shieldS, which turns freely on theaxle of said pulley, so as toconform to the different positions or directions of the rope in raising and lowering the free end ofthe davit. This shield S has an eye, b, through which rope R passes, and by which the hood or shield is caused to accommodate itself to this rope, and also-held safely in the groove of the pulley P, whether the boat surges fore and aft, or in any other direction. 4

rai-iu I 2 I v l,

'llo-enable a person to pass safely down over the davit or davits to a boat which is lowered in the water, or to pass from such boat to th'c vessel, a ladder or stairway is constructed upon both the straight and curved sec tions ot' each davit. l This may bc done by screwing rounds 'fr into the sides ofthe straight and curved sections of the ilavits, and applying rails rl r2 t'o the ends ot said rounds, as shown in iig. 4, sheet 2. In the modei, the rounds `and rails of the curved sections of the davits' are applied on the inner sides thereof, while the rounds and rails of the'straight sections are applied on their outer sides; -it would bevpreferable, however, to place the latter on the inside also. In order to complete the passageway, a hand-railing is applied to each section of leach davit, which railing is formed on thestraight portion of each davit by the supporting-standards d d, and

rail c. 'These standards are pivoted to the rounds, or to ears at one end, and to the rail c at the other end. The rail c is hinged by its lower or inner en'd at c to one ot the suspension-bars V, above the point of attachment of the davit to the vessels side, and all the parts are of such length that true parallelograms are formed between the several pivots, which admit ot said parts folding up eoinpactly when the davit is brought to an upright position, shown lin iig. 1. On the curved portion of each davit, the hand-rail consists simply of a standard, 1w, with a hand-rope, d1, fastened to an eye on the free end of the rail e, and passing through an eye formed on the upper end of this standard, as well as-through an eye at the outer extremity ot' the rail r2, terminating in a ballor iioat, cl2, to keep it taut, and to facilitate the grasping of this rope. The weight of the boat will prevent the turning 'of these curved portions when stepped upon by persons. When the ladder-ways on the upper and lower portions are both on the inside, the former lap and rest on the latter, which steadies them the more. The rope R of each davit passesfrom the h ooded pulley P over a pulley, F, figs. 1 and 2, and thence down the gunwale, beneath tho'deck of the vessel, and under a pulley, G. 4From this pulley the rope of each davit passes beneatha pulley, z, toa drum, 7c. The rope R of each davit is prevented from fouling by having a grooved roller, h', to pressfupont and hold it securely in its place inthe groove of the pulley h. The drumsA K K are applied to a shaft, L, which isarranged longitudinally with and in the centre of the vessel, as shown in tig. 4, sheet 2.y By means of a friction-brake, a hand-wheel, and a ratchet and pawl, applied to the drumshaft L, one person can raise and lower a boat on an even heel. Those parts which relate to the drums and the method of rigging the boat and davits, will be described vin another application for a patcnt, which I have lettered B, and which will accompany this application. i i

As the vibrating davits, when lowered, would .endanger a boat rising suddenly upon a wave, it is desirable to have these davits rise out ofthe way of the boat when relieved of the weight thereof. For this purpose, twoA suspension-bars, V V, are hinged to each davit, close to their respective pivots, as shown in figs, 1 and 2. The upper ends of each pairof bars V V are pivoted to the outer forked ends ofthe lever X, which-has its fulcrum in the side of the vessel. The inner end of this lever X is pivoted to thc upper end of the rod Y, which passes down through a series or pile of springs, I, which 'are made ot India rubber or other suitable material, and which alternate with plates I. These springs are confined between cap and bottom plates, in a suitable manner, and upon said rod Y, beneath the bottomcplate, a screw-nut, Y', is applied, by which the tension of the springs can be easily regulated. lThe cap-plate is confined by two outside rods to the fixed bracket Z, as shown. The lower end of the said rod Y passes freely through an eyii which is made through the said fixed bracket Z,.so

that thisrod, with its springs, will accommodate itself to the sweep of the end of lever X, and the davits will preserve a proper distance from a iloating boat suspended from them.' When the davits are both brought to upright positions, shown in fig. 1, and secured by .means of'latches, g, or other suitable device, their upper curved sections may be swung around like the old and well-known swinging davits, and under certain circumstances a boat may be raised'and lowered in the usual manner, without swinging the davits tbward and from the water.

The devices for attaching the boat to the ends of the davit-ropes R R, and detaching it therefrom, may be constructed in any suitable manner. The device shown in the 4drawings will answer a very good purpose, and

will form the subject of an application for a patent.i"wlxich is lettered 0,'nnd which will accompany this application.

Having described iny invention, what I ,claim as new, and desire to secure by Letters Patent, is

1. Davits which are hinged in such manner as to swingfreely in vertical or nearly vertical planes toward anifrom the water, and to vibrate above and below a horizontal plane intersecting their axes of motion, substantially as described. i

2. The application of curved-sections to the upper ends of davits which are hinged at their lower ends, so that said sectionscan be turned around, independently of the standards or lower sections of the davits, substantially as described. i n

3. The application of a ladder to a davit, operating substantially as described.

4. The combination of a folclingl1and-rail and ladder to a hinged davit, operating substantially as described.

5. Boats."davits, hinged lsubstantially as described, when counterpoised by a i'orc'c suilicient to raise them without the boat, but easily overcome by vthe weight of the boat.

.liB'lh CRE iZBUR.

Witnesses:

Wat H. WooDMAn,

WM. G. WnEnLwmGnr.

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