US1369132A - Adjustable inclined davit - Google Patents

Description

A. P. SCHAT.

4ADJUSTABLE INCLINED DAVIT. APPLICATION FILED MAR. 29. 1919.

1,369,132. Patented Feb. 22,1921.

I u 8 j@ PSG/wz 8a. .f I u KB T0 all 107mm t 'may concern rice, it

paire sra Ann r'. serrer,- or SAN FRANCISCO, CALIFORNIA,

nnJ-UsTABLEiNoLiNr-in DAvrr. l Y

Lese-,isa

lie it known that l, ANB P. SCHAT, a citicen of the Nfetherlands@ residing Vat San Francisco, in the county of'SanFrancisco and State of California, have invented certain new and useful improvements lin Adjustable inclined Davits, of which the'following is a specification. .i

lily invention relates Vto hoisting and lowering' devices, and is specially adapted for use as a-davit for ships.

Some of the leading features ,of theinvention are closely related to those set forth 1n my pending' application #230,l06 and $959,790, one object being` to provide `a rotatable davit which, when released fromfits; normal position w ll swingA outwardly by,

lgravity, thus insuring thatthe'lifeboats will be automatically .brought into position to be lowered into the water without theapplication of mechanical force. i

Another very' important object .is :to proride brake mechanism for controlling'the davit to prevent too free a rotation thereof, and for locking'V it in any given position when desired. y

'fr further object is `to' provide means for supportingthe davit in the same plane at ferent planes, whereby to regulate the power` mine lthe direction of its movements.

Still another object is to provide a davit. :adapted to kbe controlled and operated froml at which the weight is supported as 'close to the water as possible. Y

Further objects will appear joined description. in considering' the ooeration of the desliouldof course be bornein mind that each'boat is supplied, as is usual, with which in vthe subtwo ilavits (one at each end thereof) rotate toward each other.

in important feature of the construction shown in the drawings consists of a ldavit mounted at its" lower end in a socket on the' gree of inclination, and for -causing'theA inferent angles of inclination,`and in dif-v:

i its automatic movement, and to predeterspecification of Lettersratent. Patent-ed FebI 22, 1921 application mediteren 29, 1919.' serial no. 286,018. j

Figure 1 is a side elevation of one ofmy GFF-ice improved Ydavit`s,fwith certainv parts shown in section, the normal" position of the'davit bemp; shown in fulllines, and its innermost and outermost positions in dottedl lines. l' i `Fig. 2 is a fragmentary top plan View, on

an enlarged scale,'show1ng' one form (of.

brake Amechanism which I employ vfor C011-,

trolling 'thev rotation of the davit, thebrake wh'eeland davit being shownin sectiort 3 is a top plan view of the adjustable guide mechanism employed,l with my ldavit to predetermine the direction of its outboard movement, relatively tothe longitudinalel tent of theship, andeto guide the davit in said movement.. 'Y

Fig'. 4 is an inverted plan view showing the outer end of the `ruideplate,disconnected from the parts-with whichit coperates; Y

and,

on which the guide plate rotates.

' Referring further .to the drawings, Y the-- numeral l indicates the upper deck of-a ship,

ment Von its support 3.

p On the upper ,deck l of, the Aship the4 guide plate' 6,-hav'ing its outer end portion` 6a projecting over the side of tl`1eship,.andv

this projecting portion isprovided with a longitudinal slot 7 through which they davit passes. When ythedavit yis standing in a e vertical positionV on yits support', 1t

passes through the slot ati the point indicated by 5* in Fig'. 3,' and the guide plate 6 is' so constructed that itrotates around this point 5X as a center; from which it will be seen thatvby'a suitable rotation of said guide plate, the davit may be made to :swing out-` board'at any desired angle relatively to the' longitudinal extent of "the ship; andin thus swinging in and out, 1t will always move 1n A Fig. 5 isa top plan view of the base plate i path of therdavit as it moves to Aits inboard position. Therefore, inV orde-r to the plate 6 to rotate around the center 5X, l' provide the outer end portion 6a of said plate, on its under side, with*l a circular tongue 6b, and this projecting end 6a of said guide plate I mount on the base plate 8 which is rigidly secured to `the deck Y of the ship, and has a circular groove 8 adapted `to rotatably receive the to'nguelb tot rotate-therein, the common center from which said tongue and groove are struck bc-Y ingat the point 5 when the parts are in Y their operative positionl relatively to each other. Y A v The outer end 6a of they guide plate is fur'- ther `provided with a curved slot 9, also struck from the center 5X, and working in this slot is a bolt 10 for suitably holding and locking the end Gaof the guide plate in engagement with the base plate 8. Y

Y At the inner end of the guide plate 6 is a segmental locking plate 11 rigidly secured to' the deck ofthe ship, and provided with a' slot 12 also struckvfrointhe center 5X, and in this slot is received ,a locking bolt 13 can ried by the'ii'ange 14A at the extreme inner end of the "guide late,lwhich flange projects Vunderneath the inner edge of the locking late 1l. p

Y Hencejit will be seen that the guide plate 6 willv be very securely held in lany position'to which it is adjusted, being locked at its cuter endto the base plate 8,

and at its inner end to the locking plate 11.

The plate 11 'may be made to include as great an larc of a circle as the needs of each case may require.

My davit has two distinct movements: first, its rotary movement which does not 'change the'angular positionV of the lower portion of; the davit, but causes its upper portion to swing around by gravity when the davit is in its normal inclined position;`

and secondly, its Voutboard and inboard movement in which the entire davit is rocked inwardly and outwardly on the ball and socket jointat the lower yend thereof,thc'

davitbeing,r guided in thismoveinent by the slot 7 of the guide plate. I

j4 This rocking movement of the davit on its l lower end is preferably controlled by a screw mechanism having an internally threaded vpipe 15, and a cooperating externally threaded pipe or bar 16, thel pipe 15 being bifurcated at its outer end to form the branches 15a for pivotal engagement with the davit, and the threaded bar 16 being sup- Y ported at its inner end by the post 17 at the inner end of the guide bar 6. VA short bar or shaft 18 i`s rotatably mounted inthe post 17, and isv held against endwi'se movement Vtherein by the two collars 19 rigidly secured to said shaft, one on either side of said post. The shaft 18 and the threaded bar 16 are connected together by means of a universal joint 2o. n 1 c Y On theV outer end of the shaft 18 is a hand V wheel 21 for rotating the same to operate the screw mechanism of the davit. VThe cooperating parts 15 and 16 of `this mechanism constitute a Vthrust screw for imparting to the davit a very positive inward and out-l ward movement when occasion requires.

At the outer bifurcated end of Vthe threaded pipe 15, I provide the davitwith'a brake wheel 22 rigidly secured to the davit and received between the branches 15a at the end of ,thel pipe. For this wheelI provide any suitable brake mechanism of ordinary or. preferred construction.V For the purposes of this application I .have deemed it sufficient to simply show a strongband brake 23 provided on diametrically opposite sides ofthe brake wheel'with rigid bosses 24, and terminating in twoA end sections 2.5 approximately parallel with each. other, and

providedwith a clamping screwr26. The

bosses 24 have pivotal. connection with the branches 15a by means ofthe pivots 27.

Whenthe davit is standing in an inclined position (for instance as illustrated iny full lines in Fig. l1,which is its normalposition), with its, upper portion turned `more or less away ,from the. direction in which the davit is leaning, thedavit willhave a tendency to swing varound 'by gravity, and thev greater the weight. imposed. upon the davit and the greater its inclination,the reater will be its tendency toV thus rotate. ence, when the lifeboat chock, withfwhich this davit is intended'to coperatecollapses and suddenly throws the weight of the boat on the davit, the davit is `liable to rotate too suddenly, especially if the .ship chances torpitch or tilt in a direction to increase the outward inclination of the davit` Incases of this kind, or when heavier loads than had vbeen anti-r cipated, lare suddenly thrown upon the davit, the brake serves a most useful-.purpose in preventing the boat'from being automati-v cally pitchedrtoo suddenly overboard. It

will therefore be seenthat with my inclined davit the brake serves a most. useful purpose in checking' itsmomentum as it rotatesv outwardly. Italso yserves a further very useful purpose, in providing means Vfor locking the davit at any desired point of its' rotation. This is especially desirable whenV the davit isin its extreme outboard and in-, board positions where itk is very desirable that it should not be rotating back and forth ico as the ship rocks, orthe windshlow, or other slight forces operate uponit, or upon ln ordertliat the hand hrake mayv lle amply strong tov support the weightimposed upon it at times, and may yet be flexible' enough to. operate well as aV brake, l lmay make it/as broad as may he necessary and make the brake vwheel 22 correspondingly long. The brake wheel'is provided at its ends with annular outwardly, extending anges 22a to hold'tliehand brake against longitudinal movementon the'brake wheel.

The strain imposed upon the hand brake by the resistance which it'offers to the rotation of the davit imposes a lateral strain upon the thrust screw arrangement, and to prevent this strain from everdnicklingv or bending the threaded telescopmg parts and 16 in' a way that might prevent them from working` properly, l ere lt upoirthe guide plate 6 asecond post 28 provided with a slot '29 through which the threaded pipe 15 passes. This post will resist any sudden or excessive lateral strain that the brake may ever impose upon the thrust screw. n

`The larger section v15 of the thrust screw arrangement isv placed outwardly next the davit because its greater diameter adapts it to olier greater resistance to the lateral strain imposed upon the thrust screw arrangement by the brake, which strain is or course greatest at the outer end ot' the thrust screw adjacent the post 2S.

rhe guide har 6 is provided with the lateral extensions GX on opposite sides ot the post 28 to widen said bar at that point to prevent the lateral strain imposed upon the post 2S from imparting a twisting strain to -the guide har. The slot QQiis sufficiently long, to permit the member' l5 of the thrust screw to ino-.fe downwardly without interference when the davit is rocked to its lowest out- Y hoard position. i

rlhe section 1:3 of' the thrust screw may he provided on its outside with a. loose-litting section of pipe 30 (as. indicated in dotted lines in Fig. l) it desired, which pipe can he used as a cover for the exposed threaded portion or the Screw bar 16, when the davit is standing idle.

lThe universal joint 2O will enable the thrust screw to operate the davit equally well in all positions.

The tlluS. SCIGW and the guide Dplate .6 hlm' aus entend in the same. longitudinal di-) a when'one is adulsted l0 a (hilt/1th `vosition. the other is moved with 1t, S0 that than. relative longitudinal' rela-tion to each other is not changed but remains always the en l 7parits always lie1 extends centi-ally through the socket at the lower end o1 'e e; avvii. en that the lower portion or the (ravit,

rection;

the vertical plane, in which these p asy it rocks inwardly and outwardly on its socket support 1.1-, always moves in this same To gum up lt will be geen, igttlnt I have provided a davit 'which normally stands with its lower portion vin an inclined position, and has adjusting meansforchanging its inclination to any desired angle.; secondly, that the. davit will vtend 'to automatically swing; around by gravity and come to rest in a vertical plane entendinglongitudinally ot' the guide plate whenever the lower portion of the davit-is inclined toward one end or the other otsaid plate, andthat the greater the inclination of the davitv,.a s a whole, the stronger will this tendency he; thirdly, that since the guide plate is rotatable around the point 5*, itlmay be caused to extend longitudinallyv toward A any desired point ot the compass, and therchythe point towardwhich the davit shall tend to move and come to rest can Vhe accurately predetermined, so that the davit may he adjusted to swing overboard and come to rest at any desired angle tothe longitudinal extent of the ship; iourth, that the movement of the davit in any desired direction is not lett dependent upon the tendency imparted to the davit by the adjusting,- means to move it in that direction, but that it is further provided 95 with means for positively guiding it and forcing it to move in the predetermined direction; and, liith, that it is provided with brake mechanism for checking` its movement, or locking it at any desired point in its ro- 100 tation.

s to the operation or" my davit, itV is only necessary to add that when'a lifeboatY is to he placed on the checks, the davit is drawn inhoard hy means -ol' the thrust screw ar- 105 i-angenient, till .its lower portion has passed the vertical and reached its innermost position, inclining' slighty inhoard, as indicated in dotted lines in Fig. 1. lt will then have a slight inclination to automatically rotate 110 inwardly, and hence when the brake is released, the boat can he most easily drawn inhoard into position to he lowered onto the checks. When the heat is secured on theV checks. the davit rotated vtill Vits upper 115 end is brought into its normal angular relation to the loneitudidnal,extent of the ship, and then the brake is applied again. The davit is then bodily rocked outwardlf,7 h v means of the thrust screw into its normal 013-' 120 Olatit'e position. as illustrated in full lines' in Fig'. l, and the tackle connecting it vvth' the liieoort 'is properly adwdusted. 1t will now he seeirthat when the llOC COBQSPS, V and the weight ot' the boat is thrown upon 170 the davit, the .davit will automatllly seing ai@ boat overboard, m rOSltlOn L0 be lowered' into the Wle- Then the weather is rOUgh and there. 1S

dangel. of bumping the lifeboat agalns the .130

a guide for the davit to hold it against rocking bodily in a plane "at 4right angles to the longitudinal extent of' the thrust mechanism Yandy to relieve the thrust mechanism from' lateral strain `when in its extended outboard position.

l5. In a device of the character described, aY davit mounted for universal rocking movement; a rotatable guide provided with a guideway, said j guide having its center of rotation insaid guideway at a point in vertical alinement with the center upon which the davit rocks; actuating mechanismL for rocking the davit Vbodily packV and forth in said Vguideway; and'means for jadjusting the guideV with its guideway to `extend toward different points yof the compass, to adapt thel davit to rock in any desired direction. i f l Y 16.*In a' device of the charactervdescribed, av davit mounted lfor, universal rocking movement; a rotatable guide provided withV a` guideway, said guide having its center of rotation in said guideway at a point Vin .vertical alinement witlithexcenter upon which the vdavit rocks; actuating mechanism for rocking the davit bodily back and forth in said guideway, said actuating mechanismv extending in the samedirection asV said guideway and being adapted to rotate with said guide; andjmeansfor adjusting saidY parts to extend in diil'erent directions, whereby to impart tothe davit positive guided j movement' in any desired direction relativelyv to the longitudinal extent of the ship,'

17. Ina device of the character described,

'a davit mounted for universal movement on the second kdeck of a ship and extending upwardly. above the upper deck, -the upper and lower portionsV of the davit being disposed at` anangle to each other; means on the upper deck for normally holding the,

lower portion of the davit to rotate on'its longitudinal axis, normally in an inclined position, and for otherwise controlling and operating the davit, said means comprising ar rotatable guide plate having a. portion extending outwardly beyond the upper deck provided with a guideway, said guide having its center of rotation in said guide- Wayy at a'point lin vertical alinement with the center upon which the davitrocks; a p'ostlat the inner end of said' guide plate; thrust screw mechanism journaled in said post at its inner end and engaging the davit at its outer end lwith a universal joint near its inner end adjacent said post;` a friction lock kfor engaging the davit at theoutei' end of thejthrust mechanism; a second post mounted on the guide plate near the outer endoi1 the thrust mechanism and provided with aslot through whichthe thrust mechanism passes, whereby to brace vsaid mechanism against the lateral strain imposed thereupon by 'the lock; and 'a segmentalk plate at'the'inner end of the guide plate provided with means for rigidlysecuring the guide'` plate at any .desired angle of adjustment, whereby to adapt the davit to rock in any desired direction.

p 18,"In a device ofthe characted described,

a davit having its upper and lower portions disposed atan angle to each otherand normally held 1n an inclined position to cause they davit to rotate by gravity gfmeans forl adjusting thedavit to .different angles'of inclination; a non-rotatable memberadapted for irictional 'engagement with the davitl in all its positions, to 'form a brake for regulating the degree of frictional engagementbetween said parts. Y ,j i

In testimony whereof I aiiiX my signature.

A. PSCHAT.

AUTOMATIC DAVIT. K APPLICATION FILED Jvu'NE 21'. 1920.

Images