US483421A - Samuel b - Google Patents

Description

(No Model.)

S. B. BUTLER,

DAVIT 1100K. No. 483,421. Patented Sept.4 27, 1892.

A TTORNE YS.

ms mms nus co., mero-umol, wnsmncrrcn, n. c:

UNITED STATES PATENT OFFICE..

SAMUEL B. BUTLER, OF NEV YORK, N. Y.

DAVlT-H OOK.

SPECIFICATION forming part of Letters Patent No. 483,421, dated September 27, 1892.

Application led February 11, 1892. Serial No. 421,136. (No model.)

To all whom it may concern:

Be it known that l, SAMUEL B. BUTLER, of the city, county, and State of New York, have invented a new and useful Davit-Hook for Lowering and Hoisting Boats, of which the following is a full, clear, and exact description.

When the ordinary blocks and falls are employed to lower small boats away from davits on sea-going vessels, great danger is incurred if these devices that are attached at the bow and stern of the boat are not manipulated together, so as to carry the boat down in a horizontal position and allow it to strike the water, and thus allow both fall-ropes to be cast oi at the same instant. Experience will enable the sailors to work the falls together measurably well; but in a rough sea the castin g-ofE of the hooks on the sheave-blocks from i the bow and stern of the lowered boat is a work of difficult execution and may result in oapsizing the boat or pitching the man at the bow or stern overboard.

The object of my invention is to produce a simple and reliable davit-hook that will engage the block and also with the suspendingring of the boat fall-ropes, so as to automatically release the ring as soon as the weight of the suspended boat and its load is upborne by the Water of loatage, a single block and tackle being used as well as a single davithook therefor.

A further object is to provide the improved davit-hook with means to lock its releasingsection when this is necessary, said locking device being adapted for speedy adjustment manually to secure or release the nose portion of the hook and prevent or permit its vibration and release from the fall-rope ring.

`To these ends my invention consists in the construction and combination of parts, as is hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forminga part of this specitcation,

` contact, as shown in Fig. 3.

the davit-hook, enlarged and detached from the`hook-body, showing the formation of a locking-bolt on a rotatable keeper-ring which is a part of the improvement. Fig. G is a transverse section of parts adj usted as shown in Fig. 2, taken on the line 6 6 in said figure.

Fig. 7 is a cross-section on the line 7 7 in Fig. 4 with the parts adjusted to release the tripping-hook nose, as shown in said figure; and Fig. 8 is a front view of the tripping-hook nose broken away above and having hooked engagement with a ring on the fall-ropes.

' There is a cylindrical hook-bodyAprovided, (see Fig. 3,) which is enlarged at a, producing a square shoulder, below which the body is rearwardly bent, as at b, and below is forwardly curved and extended a proper length to produce a limb c for the pivoted support of a tripping-hook body A. The nose-piece mentioned is formed to afford a heavy body which is upwardly extended suiiiciently to provide a nose d-that is, tapered toward the terminal above to render it shapely and effective in operation-and below rearward of `by loosely joining the latter with the hook that by gravity will normally assume the position shown in Fig. l, if tree to do so.

An upwardly-extending limbe is formed on the hook-body A at a proper distance from the nose d, which limb and nose together produce a hook, the front side of the limb being rounded and its rear side Iiattened to tit closely upon the dat front side of the portion of the body A extending between the shoulder a and limb o, thereby completing the hookbody when the nose-piece and part A are in At a proper point above the shoulder a the picceA is diametrically reduced. and forms a bolt axially extended from the lower portion.

A cylindrical sleeve B is a portion of the body A to slide loosely through it, thelength of said bolt portion being suiicient to permit its upper end, which is threaded and reduced, to pass through a center hole in the washerplateg and be thereto secured by anut placed on its projecting end. Between the washerplate g and cross-Wall g2 a spiral spring g5. is

located7 encircling the bolt extension of the' body A, the expansion of which spring will normally retain the hook-body adjusted, so thatits shoulder a will impinge upon the lower end of the sleeve B, while the washer-plate g is lifted off ot the shoulderg and aligns its top surface with the upper edge of the sleeve.

. A radial liange h is extended from the upper edge of the sleeve B outwardly, and a band h is placed upon the enlarged upper part of the sleeve, loosely eugagingit and the ange 7i, the latter preventing the band from slipping o of the sleeve. A loop h2 is secured at its ends upon the band h oppositely, so as to adapt the loop-piece to swivel and rock.

The lower end portion of the sleeve B is apertured at the front and has two collars t" formed on it, the wider portion of said aperture being produced in a part of the sleeve that lies between the collars, as shown at 2 in Fig. 4. The lower collar i is out through,

Y as isralso the portion of the sleeve it projects 'Y DESS.

from, thus slotting the material from the aperture i2 downwardly and through the lower edge of the sleeve, the width of the slotted eX- tension of the laterally-elongated aperture i2 being less than said aperture, thereby leaving a locking-wing on each side of the slot, as indicated at i3.

The cylindrical body A is forwardly tlattened above the shoulder a a short distance, which reduced portion aligns on the face with the flat partrbelow thershoulder named, and the limb e islengthened, so as to bear upon the entire flattened surface of the body A. Upon the upper end of the limb e the material is fashioned to produce a locking-head e', the main portion of which is of such a thickness as will permit its sliding between the wings 713 of the sleeve B, and oppositely on the edges of the head e an ear e2 of like shape is formed on each edge, said ears being located near the top of the head, allowing spaces below them where the head is of normal thick- The dimensions of the ears e2 and their general contour is such that they will pass freely through the aperture i2 when the head of the limb e and the aperture of the sleeve are oppositely located, which will occur if the limb is in contact with the hook-body A, and the spring g3 is allowed to raise the hook-body till the collar t" and shoulder a are in contact, which will be effected if there is no weight imposed upon the tripping-hook nose A', as shown in Fig l. Between the collars t z a loose ring m is located, having spaced ribs m formed on it to afford means for its convenient rotation manually, there being a notch m2 cut from its lower edge upwardly of sucha width and height as will give it equal or greater dimensions than the aperture i2 in the sleeve B, so as to allow the head of the limb e to pass through the notch when the ring is adjusted to locate the notch over the aperture correctly. One of the ribs m on the ring m, which is directly'rearward of the notch 'm2, is vertically slotted to receive a projection on the slidebolt m3, which is thus held upon the rib free to reciprocate vertically a proper distance, so that its lower end portion may be causedto enter a hole in the collar t" and retain the notch registered with the elongated aperture i2 or be disengaged from the collar, so as to permit the ring m to be rotated and carry the notch away from the aperture, which will close the latter and lock the limb e in contact with the body A.

In operation the davit-hook'is suspended from the boat-hoisting device by its loop h2 and the fall-ring n, placed in the bight of the.

hook A', as represented in Fig. 8, the fallropes n', (shown broken,) which are extended to the bow and stern of the boat and thereto secured, serving to removably secure the boat (not shown) to the davit-hook. It the boat is inboard on the vessel, it may be loaded and swung outwardly into the usual position for lowering, and as the weight of the boat, empty orrloaded,-is Ysufficient to fully Ycompress the:V

tated to place its notch over the aperture in j the sleeve B, so that the buoyancy of the water,

when it has contact with the boat, will slacken the fall-ropes and permit the spring g3 to expandand slide the hook-body into the position shown in Figs. l and 2. Then the weight ot the ring n and ropes n will vibrate the nose of th pivoted limb e outwardly and downwardly, as shown by dotted lines in Fig. l, and detach the ring and ropes from the davithook.

It will be seen that the release of the boat can be exactly timed to insure safety to the occupants, and is at all times under control of the party in charge of the davit-hook, so that the danger Yot capsizing the boat or injuring its occupants, incidental to ordinary methods and devices for hoisting and lowering boats, is completely obviated.

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

l. In a davit-hook, the combination, with a IIO cylindrical hook-body, an enveloping sleeve wherein the body slides, a washer-plate above within the sleeve, secured to the body and `hook-body that is cylindrical and provided with a bolt extension above and a curved portion below that is flattened forwardly and projected on the forward side to provide a limb below, ot' a supportingsleeve having two spaced collars below, apertured between the collars and slotted from the aperture through the lower collar, leaving wings, and a tripping-hook pivoted on the limb of the hookbody, having a weighted nose, and a limb projected upwardly from the hook, having ahead above furnished with ears that will interlock with the wings when the hook is loaded, substantially as described.

El. In a davit-hook, the combination, with a sleeve, a locking-ring between collars below, and a slide-bolt that will enter a hole in the lower collar and retain a notch in the ring over an aperture in the sleeve, of a hook-body adapted to slide in the sleeve, a spiral spring thereon which will raise the hook-body to impinge a shoulder thereon against the sleeve below, a swivel-loop above on the sleeve, and a trippinghook piece pivoted below on the body and provided with a limb having lateral ears above that will lock with wings on the sleeve below its aperture when the hook is loaded, substantially as described.

4. In a davit-hook, the combination, with a supportingsleeve, a swivel-loop thereon above, a hook-body within passing through a perforated cross-wall of the sleeve, a spring thereon within the sleeve, and a'washer-plate above on the hook-body, adapted to rest on a shoulder within the sleeve and limit the depression of the hook-body, of a tripping-hook piece secured pivotally on the bent forwardlyextended limbof the body below, weighted below its nose, and adapted to be detachably locked to the sleeve above, substantially as described.

5. In a davit-hook, the combination, with a hook-body supported to slide in a sleeve and held normally elevated by a spring that engages the sleeve and a plate on the hook-body above, of a weighted hook-nose piece pivoted on a projecting limb of the hook-body near its lower end, a locking device on the sleeve and upper end of the hook-nose piece that will lock the nose-piece from vibration when it is loaded, and a device encircling the sleeve at its lower end, which is adapted to retain the nose-piece in locked connection with the sleeve by its rotatable adjustment, substantially as described.

SAMUEL BUTLER. e

lVitnesses:

` WM. P. PAT'roN,

` E. M. CLARK.

Images