US1279084A - Sectional dry-dock. - Google Patents

Description

l. L. CRANDALL.

SECTIONAL DRY DOCK. APPLICATION FILED Nov.26. 1911.

1,279,084. l Pandsept. I7,1918,

2 SHEETS-SHEET I.

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J. L. GRANDALL` SECTIONAL DRY DOCK. APPLICATION FILED NDV. 26, I911- Patented Sept. 17,1918.

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JAMES I.. CEANDALL, 0E EAST BOSTON, MASSACHUSETTS, ASSICNOH To THE CEANDALE ENGINEERING COMPANY, 0E EAST EosToN, MASSACHUSETTS, A CCEPCEATICNCE MAINE.

SECTIONAL DEYDCCK. i

Specification of Letters atent. Y Patented Sept. 1 7', 1.918. Y

Application led November 26, 1917-. Serial No. 203,905.

`To all 'who-m t may concern Be it known that I, JAMES L. CRANDALL, a

citizen of the United States, and a resident of East Boston, county olE Suiiolln'and State ofvldassachusetts, have invented an Improvement in Sectional Dry-Dooks, of which the following is a specification.

My invention relates t0 sectional floating dry docks of the general Ustype, and has particular reference to means for rigidly securing the sections together to. form a unitary structure.

The object of my invention is the provisionof means whereby the component sections of the floating dry dock may be rigidly secured together to form a unitary structure, and whereby an unequal stress in anyone section, or sections lmay be transmitted to otherA sections to thereby distribute and equalize the load Vupon each section. I The means whereby I accomplish the object of my invention is in the provision of a truss orf a sectionof a truss carried bythe float vportion of each section and preferably. arranged' within the side walls of each section, the members of which truss or part of truss have terminals extending 'beyond the ends of the side walls of the sections, providing means whereby two adjacent sections may be rigidly united, whereby the separate trusses or partsV of trusses may form a uni- 'tary truss extended the length of theentire united section, and whereby the stresses set f up in the members of any one truss section may be transferred to the members of other truss sections in the unitary truss.

Figure 1 isa plan View of a, sectional dry dock embodying my invention;

Fig. 2 is a side elevation of the same.

A Fig. 3 is an end elevation of a section.

Fig. 4 is an enlarged sectional elevation of a truss section as arranged in the side Walls of the section, and the end connection between two adjacent sections.

Fig. 5 is a partial plan jview ofl the end connection. l

Fig. 6 is a side elevationof a docksection with a. modified form of truss.

As here shown, the floating dry dock comprises a number of sections 10, adapted to be placed in juxtaposition to form the unitary diy doek illustrated in Figs. 1 and 2. Each section may comprise the bottom or float portion 11 and side walls 12. Thebotbody or float 11 of the section.

tom portion ofi the side walls may be made 1n any usual or convenient manner.

The truss, with which my invention is iTEn STATES PATENT OFFICE* 1 iY concerned, is ior may comprise the top hori-V zontal members 18, lower horizontal mem- 1 bers 14 and transverse members 15 connecting the horizontal top andbottom members. The various members composing the truss or section [of the truss may be formed of I l beams, or any other customary orfdesirable structural shapes.

The-top and bottom members 13 and 14" are provided with enlarged end terminal portions 16, to lwhich are secured the end connecting members. rIhe lend connecting members formed with flanges 17 and ex-y tended ears or lugs 18, are secured to the enlarged end terminals 16, and thereby form an integral part of the truss structure arranged, as here shown, in the end. wall of the section. Y

As here shown, certain of the end connecting members are formed with one ex` Vtended ear` or lug 18 and others are formed lwith two extendedlugs, which are adapted to be placed in juxtaposition and secu-red together by apin 19v extended through holes or openings through said ears or lugs 18, to thereby connect the top andv bottom members ot' the truss section within each section to form a unitary the sections.

Each trusssection may be integral with' structure extended between or separatefrom the side wall of the section,

but is` adapted to be secured to the main When each truss section is connectedA together through the end connecting terminals to form aunitary truss, it may be seen that, through such connection, the stresses in the members of any truss section will be Vtransfmembers of other truss sections composing the united truss and that the dock sections are'thereby rigidly united together to resistrelative displacement in a. vertical direction.

' 95 mitted, through the `terminal connection, to

Asfhere shown, that portion-of the truss forming the lower member comprises two j vseparate beams 14, which are united by the end Vrterminal portion or member 16. If one section is loaded unequally in comparison to a contiguous section, there will be a shearing 'stress exerted upon the pin connecting the truss members, `due to the tendency toward wwalls, and tension members 2l are exten-dedA relative verticalxmovement between the secl tions. With th'e provision of twor separate .truss sections are united to form aunitary truss, serves to rigidly unite the several dock sections, and the truss form may be modified in many waysto suit the particular requirements of the design of floating dry dock..

Amodilied forniof truss is shown in Fig. 6, in which the top and bottom members lY and 14 are maintained in spaced relation byV the vertical end struts 20, which may bel incorporated in the end walls of the side between the ends ofl the top and bottom members. Such laformi of truss is, to all purposes, equivalentto the truss above described,` and will perform the functions v equally well.

I claim: l. In afloating dry dock rality of independent dock sections adapted to be brought together to form thedry dock,

of a truss section carried by each doek section, the truss-sections ofv the'independent docky sections being adapted. to be connectedtogether to form a unitary truss rigidly extended between thedoelt sections to thereby connect the'independent dock sections.l

2.' In a floating dry dock comprising a plurality of independent dock sections adapted to be brought together to form the dryldoek, of a truss section carried by each doek section, and means connecting members of the truss sections of the independent doek sections to form a unitary truss ex-tended between the. united dock sections.

3.-' In a floating dry dock comprising a plurality of independent dock sections eachV having a float portion and side walls, said independent sectionsadapted to be brought together to form the dry dock,l of a. truss section arranged within aside wall of each doch section,.the truss sections of the doelt sections adapted to be. united to form` a unitary truss rigidly extended between theV united doek sections. 4f. In afloating. dry dock comprisin-gaplurality of independent sections each having a float portion and substantially vertical side Copies of this patent may bev obtained forcom-prising a pluwalls, said independent sections y,adapted to 'libe brought together to foimthe dry doek, a

truss section arranged within the side Wall of each dock section and means arranged to connect members of each truss section o f the independent Vdock sections to form a` unitary truss extended between the united dock sections. c Y L 5. In a floating dry dock comprising a plurality of independent dock sections, a truss section lcarried by each dock section, end terminal members carried :by members of said. truss sections arranged to be connected to Vunite thev dook sections and the truss sections to form a unitary truss extended between the yunited doek sections.

6'. In a floating. dry dock comprising aV plurality of independentv sections adapted I to' be brought together to form the dry doelt, each independent dock section having a float portion anda truss wall portion, of means connecting. thetruss -portionshof said' doelt sections in the assembled positionvof said dock sections to forni a unitary'truss extended Vbetween the independent dock sec'- tions.- d'

7. A sectionaliffloating dry dock comprising a plurality of independent dock' sections,

each section having a float portionv and a truss wall portion, said independent sections being adapted to: be brought together to forin the dry dock, and'` means connecting said truss wall portions ofsaid independent dock portions-in theV assembled condition of f said dockv portions to form a unitaryv truss wal-l extended between the assembled sections of the dry dock. v

8.. A sectional iifoating dry dooli.`V comprising a plurality of independent dock sections adaptedv to bey assembled to forma unitary.

dry' dock, said independent dock sections having a float portion anda truss portion',

said trussy portion having compression a-nd tension members extended the length of 4its float portion,1 and means connecting the tension members of the trussportions andthe compression members lof the truss portions' inthe assembled position of the dock sections to form a unitary truss extended be- 've cents` each, by' addressing thel Commissioner of Patents:

Washington, n.03

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