USRE129E - Improvement in propelling ships - Google Patents

Description

UNITED STATES JOHN ERICSSON, OF NEW' YORK, N. Y.

IMPROVEMENT IN PROPELLlNG SHIPS.

Specification forming part of Letters Patent No. 3,869, dated December 3l, 1944; Reissue Xo. 129, dated March 10, ld.

To all w/'wm it may concern:

Be it known that I, JoIIN Eaiossoiv, of the city, county, and State of New York, have invented new and useful Improvements in Propelling Ships; and I do hereby declare that the following is a full, clear, and exact description of the principle or character which distinguishes them from all other things bei'ore known, and of the manner of making, constructing, and using the same, reference being had to the accompanying drawings, making part of this specification, in which- Figure l is a side elevation of the stern of a ship with part of the planking and timbers removed to show the inner portion of the propeller-shaft; Fig. 2, a stern view of the ship; Fig. 3, a sectional plan of the stern through the center of the propeller-shaft.

The other sections will be explained hereinafter.

The saine letters indicates the parts in all the figures.

Prior to my invention the leading objections to the use of a propeller at the stern ol' a ship was the weakening ofthe ship by cutting the stern to form a recess for the propeller forward of the rudder, and thus carrying the stern-post, or the part with which the rudder is connected, so far back as greatly to reduce the stability of the structure. To avoid this the use of two propellers, one on each side of the run of the ship, was essayed; but this is well known to be even more objectionable, as the shafts Without care must pass out through the run of the ship so far from the stern-post and keelson to leave sufficient room between the axis of the propeller and the run of the ship for the semi-diameter of the propellers as greatly to strain the ship, and requiring, in addition to the complexity consequent on two propellers, outriggers at the sides for the support of the projecting part of the shafts,which for sea purposes is highly objectionable. Another serious obj ection was the difficulty of aecess to the propeller for the purpose of repairs, and the resistance presented by it when sailing alone.

To obviate these and other minor objections not necessary to enumerate was the object of my invention, the principle or character ct' which consists in passing the shaft of the propeller through the run ofthe ship and by the side of the stern-post, that one of the bearings may be attached thereto for strength and stability, the propeller being placed abaft the rudder; and as the location of the shaft would of necessity interfere with the play of the rudder, this part of my invention consists in coinbiniug the location of the shaft and propeller with the rudder made with a slot commencing at the outer edge,that it (the rudder) may have the requisite play; and myinvention also consists in supporting the propeller abaft the vessel by a sliding or swinging frame having a box iu which a journal of the hub turns, when this is combined with the shaft made in two parts, one sliding within the other, and so connected and provided with the necessary inechanical means that the sliding part of the shaft may be inserted and withdrawn fronithe hub of the propeller, to which it is properly adapted, to admit of removing and lifting the propeller out of the water.

Thepropeller, the hub ol' which is elongated and formed into a journal, is supported abaft the vessel by a frame of wrought-iron or composition metal, the lower end of which is provided with a bearing made to receive the said journal. The frame is made either to slide up and down on a suitable guide, the upper part of which guide is attached to the ships counter and the lower part to the stern-post, or it is made to swing on an axis or spindle attached to the stern-post just above the water-line, and it is raised and lowered by a chain worked by a windlass. The propeller-shaft passes through the run by the side of the stern-post, a bearing being bolted to the sternpost to support the shaft. To prevent the shaft from interfering with the play of the rudder, a slot is cut in the latter for about half its width, beginning at its outer edge. |This slot permits the rudder to turn as far as an angle of forty-tive degrees with the centerline of the vessel.

The propeller-shaft is composed of two parts, the one sliding within the other a. distance equal to the length of the hub of the propeller, the outer part being the sliding one, and the motion requisite to withdraw it from the hub ofthe propeller being given to it by a rack and pinion. Both ends of this sliding part of iluI shalt are made either square or six-sided or round und i'eathertal, the outer end being malle taper, Corresponding to a taper hole in the hub ol'tlie propeller. and the inner end being parallel and eorrespondingto aparallel hole in the other part ol' the shat't. The water is prevented from entering around the shaft where it goes through the run by a -slul'lingbov. `The position ot' the propeller when at.- taehed to the shaft is elose abatti the rudder7 as its Center line is ordinarily about one foot on the starboard orlarboard side ot' the ships middle line.

-X deseription oldrawings hereto annexed7 illustrating my invention. is lgiven above.

.\ is the propeller.

fr is the hub` elongated and l'orined into a journal.

l is a traine. ot'wroughtiron or composition metal. supporting the propeller bv a bearing, i. formed at. the narrow end ot' the trame, which embracesv the journal upon the hub.

tt represent the axis orspimlle. ot' wroughtiron, the inner end otVI which is Carried by a bearing7 l), bolted to the side of the sternpost. and the outer end is supported b v two broers. l. il. serured to the transom ot' the ship at r r. Thisaxisalssrsthrongh the wide end ot' the trame l. whivh is firmly secured to it by the pulley e.

ti is the ('hairnatlaebed to tliobearing l, t'or raising and iowering the propeller. lt passes through an eve, y, attached to the upper part ol' the stern, and is eonneet ed to the eapstan ora small windlass. This ehain is provided withastop so plared that when the propeller is tull lown the slop will bear against the side ol' the etve 1;.

ll ,llreprrsrnl thepro;ellervshalt1 nnule in twopars, one sliding a short ilistanee within the other. The inner end.` li. ol' the sliding part ll is toiined into a parallel square vorresponding to a hole in the other part', ll,ol`the slmt'l, which rem-iver the square. The outer end. if". ol' the sliding part is formed into a lapeisquare corresponding to a taper hole in the hub ot'tiie propeller.

lis` the eranigirnilhv lgrved to the propeileu shalt, to ronin'innir'nte motion to it l'roin a steain-eugimn .l .l are pillowbllni s` supporting peller-shall.

li is n pinion inserted in a box termed on the hollow part ol' the propeller-sliall,lor moving bark and t'orlh theslidingpnrl. Une eornrrott he square Il, at` the inner` end ol' theslid4 ing part7is' rut into a rack to suit the pinion.

l; is the winch t'or turning the pinion.

i. is' the stul'lingbox. secured to the plank ing ot' the ship at (l, to prevent the water from entering around the shall.

)l is thebearing,oteomposil ion metal. li rnily bolted to the sides ol the stern-post.

N is the rudder.

ilul pron is the slot eut into the rudder, to admit ol" a tree motion being given to it.

Fig. i is a part of the side elevation ot" the i stern of a` ship, showing the mode of raising and lowering the propeller by means ofa guide attaehed to the ship`s Counter; Fig. 5, part of a st ern view olthe saine arrangement. All parts in these figures corresponding to those in Figs. l, 13, and .'i are marked b v the same letters ot" reference.

O is the guiderod, made ol.' wrought-iron, the upper end being secured to the ships counter and the lower end bolted to the side ofthe stern-post.

l) is a t`ra1ne,olf wrought-iromprovided at the lower end with a` bearing, b, for receiving the journal upon the elongated part otthe hub ot' the propeller, as before deseribed. 'lhe upper end is provided with aijaw, p, corresponding to the guide-rod Q is a radins-bar,attachedto the frame lby a ]oint, q, and working on an axis, o', secured to the side ol' the stern-post.

It is the pulley over which the ehain (hbolore deseri bed, passes.

Having thus l'nlly described the construction and alnilieation ot` in v invention and illustrated it b v drawings. I will proceed to describe its operation. \\'henever it becomes necessaryY to unship the propelier, either to repair it or to prevent the obstruction it offers to the progress ot' the ship while she is using her sails only.y the propellershal't is drawn in by turning the wim-h ofthe pinion on the hollow part otl the shaft', and the t'rame which supports the propeller is drawn up by turning the windlas's or eapstan to whieh theehain for raising or lowering the l'rame is attaehed until the propeller is brought to the proper height above the surf-lure ot' the water, (as indicated in red in ]i`igs. 1 and 2 and in black in `igs. l. and .inl where it is lashed to the oounter. ln lowering the propeller to reatlaeh it to the shall', nare must be taken to let it down to tbe i'nll extent betere the shaft is moved out.

,l do not wish to eonline nihvsell' to the preeise straetu re and arrangement ol" parts herein speeilied, but to vary these as may be desired so iong as the principle and Charaoter of my invention are retained.

lt will be obvious from the t'oregoing that parts ol' mv invention may be advantageously employed without otherswas, torinstanee, the loeatiou ol` the sbutt and propeller,in eonnee` tion with the siotting of the rudder, may be employed to advantage without the use ofthe mode of disconnecting the propeller from the shalt and elevating it, and so this latter part of my invention may be employed without the former; but by union ofthe whole the best results will be at tained.

\Vhat1 elaixn as my invention, and desire to secure by Letters Patent, ish

l. The abovefdeseribod location or arrangement ot' the propellershaft, in combination with the rmlder,1|1ade with a Slot or recess to admit ol' the play thereof, substantially in the manner and l'or the purpose speeilied.

L. Sustaining the propeller aboli; the ruth der by a swinging 01' sliding frame, substnnframes, the making of the shaft in two parts,

tially as described, in combination with the Substantially in the manner :1nd for the purshnf't, madein two parts, Substantially in the pose spncivd.

manner and for the purpose spviwl. J. ICR [(YSSON.

L In combination with thu :11'1:1nglenuf1xt01' WHUPSSOS:

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