US1313404A

US1313404A - Planodraph co

Info

Publication number: US1313404A
Authority: US
Publication date: 1919-08-19
Anticipated expiration: 1936-08-19

Description

T. H. MARTEN.

SHIPS DAVIT.

APPLICATION FILED APR. 6. 1 911. RENEWED JAN. I3, 1919.

1,313,404. 1 PatentedAug. 19,1919.

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IJIVENTOR: MW II III I I III III III Tm: LOLLMBIA PLANOGRAPH cu" WASHINGTON, D. c.

T. H. MARTEN.

SHIPS DAVIT: APPLICATION FILED. APR. 6. 1911. RENEWED JAN. 13,1919.

1 3 13, 4:04: Patented Aug. 19, 1919.

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THE COLUMBIA PLANOGRAPH c0, \vAsmNd'roN, D.

1 UNITED sm'rns s THOMAS-HENRY MAR EN, F YORK, NQYQ sHir 's nAvIT.'

sp ecificati'onbf Letters Pat nt; gw f d A ,-19 1919,

Application fi'led April a 1917; seria1nb.-1se,-21s. Renewed January 13, 19191 swarms. 270;945.

To all whovnit='may concern: 1.

a tancewithoutdanger of fouling the-rail of Be it known thatI, THOMAS HENRY'MAR- TEN5 a subject ofi the King of GreatBritain, and resident of the city and'- State ofNew York, in the United" Statesof America,

have invented certain new and useful lm-I provements iir- Ships" Davits, described in the following specification and illustrated-in the accompanying drawings,- tl1*a.tifo1*m part of-thesame:

Theprincipal objects of the invention are to -devise a form' of davit' for handling ships boats which may be operated with: ease and the minimumof mechanisln to carry the boat outboard the maximum disthe ship. I

A further objectis to improve that form otd'aviti-il'r which the boom swings in a verticalplane so as to minimize the stress uponthe means for swinging the boom and to reduce the labor of: operating the boom:-

A still further objeot istodev ise arstructnre which will be'v extremely rigid and which" may be manufactured at Very low cost and which isadapted-te utilizethead+ vantageous' features of therot'atmg type 0fboom with the desirable featnresofrthe vertically swinging boom and further to overcome the difiiculties met with in -clear inwthe boat from the cheeks.

[any differentforms of mechanically 0p erated da -its have been devised some of which swing the boom in a vertical plane and others rotate theboom 'upon'its longitudinal axis to swing theboatsupporting The principal difficulty ofthe vertical swinging boom is end in a horizontal plane.

that in obtaining the desired outreach the boom head and consequently the boat drops considerably in the latter phases of its out ward travel and the frame and operating mechanism required is'cumbersome and eX- pensive and 111* therota'ting type the disadvantage isthat the boom operates in a transverse plane and has no upward movement to effect the=lifting of the boat from its rests.

The present inventiona consists essentially in; effecting acombined vertloal swinging and axially rotating movement oftheboom:

In the 5 accompanying drawings. Figure 1,

is a side elevational view of: a: davit constructed in accordancewith thisinvention 'Fig: s a detail horizontali sect/ion; thro ugh-the=line a b fr"Fig.- 1. a

Fig. 4 is a side elevational view on; a"

modified formaofsdavi-t and! Fig.5. isan end elevational.view..

Reterringto the dr-awings the frame 1 is a rlgld cast structureiofi rectangnlariform' having the-cross web 2 extending: between the end: standands and. 4" intermediate oftheir 'height,. said. standards; having; horizontalzjour-nals 5 and: 6 adj acentto the: top

in which the screw spindle l' is jounnaled'.

'A- bar. 8 is rigidly securedbetweenrtheupper ends ot the% standards in :parallel': ar-

rangement with the" spindle 7 and forms a guide for the? .crosshead which is in: the form of a sleeve": encircling said 'bair. The

crosshe'ad' '9 l is": formedwith:v a downwardly extending lugfibl which: is; threaded upon thel spindlefl so: that upon: the rotation of the Spin (116131116 CROSShGHdLWillt be caused to travelon the'gnidea. a A 131V0tp111 12; rigid withuthercrosshead9 extends lateral 1y from; one side thereof and v v mu ppglfts a sleeve' lg which" iseprovided with a: projecting. lug 14 through which said pin extends:-

The davitn boom= 15= is slidablyi' and rota tably held intermediate of its length in the sleeve 13 i and the lower end lfiiiSirotatably stepped in a cup 17 pivotallyri'mountediat the baseof the frame andadaptedto swing in a vertical plane;

Thecross web 2 of the frame --is formed with aquadrantal: toothedi rack 18 011: the! side adjacent to the boom; said rack: being.

concentric" tothe pivotal center; of: ther cup-1'71 A sleeve- 19, keyeda-or' otherwiserigidly seeured upon the boom 15 below the sleevev 13 is formed with a toothed segn ient' 2O: which I meshes with the teeth of the rack. 18 sotha t asthe boomeswings in a verticalplane it will be caused to rotate on its longitudinal axis. A web 21 is preferably cast integral with the rack teeth 18 at the upper and swings the boom in a'vertical plane.- Coincident with'the outboard swing .ofthe from nju y, l h 1 l v p The boom 15 is formed with a curved upper end 22 and is of the axially rotating side to strengthen and protect the teeth type having a suitable'eye 23 at the upper end to receive the shackle of the upper block of the boat falls.

The boom is preferably set upper end is turned laterally over the boat andpreferably pointing inboard. Upon the rotation of the spindle 7 by means of the crank24: the crosshead 9 is moved outwardly boompost in a vertical plane the said post is rotated axially: through the engagement of the toothed segment of the sleeve 19 with the rack 18 thereby swinging the curved upper end of the boom in an outboard direc ti'on; W V

The pivot support of the lower end of the boom is preferably arranged about midway of the inboardand' outboard positions of angular-ity of the-boom.

In the operation of this vdavit, the vertical swinging movement from an inboard inclination and the first part of the transverse swing of-the outer end of the boom causes thesaid 'outerend of the boom to travel in an upward and outward curve thereby taking up any slack in the falls and lifting the boat clear of the chocks. The continued I double swinging movement carries the boat outboard in a path closely approximating the horizontal being. first raised slightly then towardthe-outer position lowered slightly, the path being slightly curved and the highest point in the movement being when-the boat is clearing the rail of the ship.

The movement is very positive and extremely simple and iowing to the rotative movement the vertical swing required to obtain the maximumfreach is Very short.

Consequently the screw spindle is short and a slow pitch thread may be used. This enables the operation to be effected with the minimum: application of power upon the operating crank.

The short .throw i of the boom postallows so that in the extreme inboard position the post slopes inboard; in a vertical plane and the curved:

invention which is to effect this axial rota- [tion coincident with the vertical 'pivotal movement.

A modified form of the device is shown in Figs; 4 and 5 in which the post of the curved boom 15 is rotata'bly mounted upon a bracket 25 pivotally secured to the ships deck so as toswing in a verticalplane. The bracket 25 is supported and operated in its swinging movement to move the boom in a vertical plane by an adjustable strut 26 pivotally connected at one end to the said bracket 25 and at the other endto a rigid bracket 27.

The coincident axial rotation of the boom is eflected by meansof an arm 28 rigidly secured to theboom post and a link 29 is pivotally connected atone end to the outer end of said arm and at the other end to the rigid bracket 27. As the boom swings outwardly in the vertical plane the link 29 pulls upon the arm 28v and rotates the boom post.

NVhat I claim as myinvention is 1. A boat davit comprising a rigid frame secured to the deck, a boom pivotally and rotatably mounted in the base of said frame and adapted to swing in a vertical plane from an inwardly inclined to an outwardly inclined position and to rotate axially, and means for eflecting an axial rotation of the boom coincident with the swinging movement.

2. A boat davit comprising a rigid frame secured to the deck, a boom. pivotally and rotatably mounted inthe base of said frame and adapted to swing in a vertical plane and to rotate axially, means slidably supported on said frame engaging said boom intermediate, of its length and supporting it against foreand aft stresses, means for operating said slidable member in said frame, and means for effecting an axial rotation of the boom coincident with the swinging movement.

3. A boat davit comprising a rigid frame secured to the, deck, a boom pivotallyand rotatably mounted in the base of said frame and adaptedto swing in a vertical plane and to rotate axially, a crosshead slidably arranged on said frame, a sleeve pivotally con nected to said crosshead and slidably encircling the boom, a screw spindle journaled in the frame and operating said crosshead, and means for effecting an axial rotation of the boom coincidentvwith the swinging move.- ment.

4:. A boat davit comprising a rigid frame secured to the deck, a boom pivotally and rotatably mounted in the base of said frame and adapted to swing in a vertical plane and to rotate axially, means slidably supported on said frame engaging said boom intermediate of its length and supporting it against fore and aft stresses, means for operating said slidable member in said frame,

a toothed rack arranged on the side of said frame, and a toothed gear secured to said boom and meshing With said rack.

5. In a boat davit, in combination a rigid unitary cast metal frame having a segmental gear rack arranged on one side intermediate of its height, a bar crosshead guide-secured in the top of said frame, a crosshead slidably arranged on said bar, a' screw spindle arranged below said guide and operating said crosshead, a socket member pivotally supported in the base of the frame, a boom stepped in said socket member, a sleeve rota- THOMAS HENRY MARTEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.