US5913A - Screw-jack - Google Patents

Description

UNITED STATES E. ELLIS AND B. S. BUcKLEroE VEoxBL'RY, MASSACHUSETTS.. l

` e SCREWFJA'GK;

Specification of Letters Patent No. 5,913, dated November 14.-, `1848.V y i T0 all whom may concern.'

yBe it known that we, FREEMAN ELLIS'an BENJAMIN S. BUCKLEY, of Roxbury, in the county of Norfolk and State of Massachusetts, have made an invention of'a new and useful Improvement in Screw-Jacks for Raising Heavy Bodies, Such as Locomotives, Cars, Buildings, &c.; and we do hereby de` clare that the same is fully represented and described in the following specification and accompanying drawings, letters, figures, and references thereof. Y

Of the said drawings, Figure '1, denotes a side elevation of our improved jackv screw. Fig. 2, a vertical and central section of the same. Fig. 3, a horizontal, central, and

transverse sect-ion of it.` Fig. 4, isa top' view of the key lever and movable metallic dog piece which operates in connection with the ratchet or ratchet wheels to be hereinafter described.

In said figures A, represents a long shaft having two male screws B, O, cut ormade upon it as Seen in Fig. 2, one of them being a right threaded screw, and the other a left threaded one. Said shaft also h-as two ratchet wheels E, F, fixed to and upon its middle part; the teeth of one of the ratchet wheels being made to stand in one direction, while those of the other wheel are made to stand in the opposite direction. In connection with each male screw a female screw Gr, made upon the lower end of a tube H, operates, t-he thread of the said female screw being made applicable to that of the male screw on which it works. f

Each tube H, has .a series of any suitable number of points or projections a, a, &c., extending from its extreme outer end as seen in the drawings. Each of the said tubes H,'H, works in one of two tubes I, I, whose internal diameter is made to agree with the external diameter of the tube H, in such manner as to allow the tube H, to slide freely and closely into and out of the tube I. Each of said tubes I, I, is closed at its bottom or inner end (as seen at b, 6,) with the exception of a cylindrical hole made through thebottom and just large enough to receive the shaft, and permit it to pass through it as seen in Fig. 2.

A cylindrical ring or collar K, K, of an external diameter corresponding with the internal diameter of the tube I, is placed upon the shaft A, and within each. tube I, as seen in Fig. 2, the said collar or ring being lheld n position orconfined/-to the shaft by a round pin L, which is passed through thek I collarv andv shaft, and ismadeof al'ength equal to vor a little less than vv'the external diameter of the collar. In order to put the `said pinyin lplace or .remove itat any time ,1 j, two holes c, c, areboredv throughoppositej sides of the tube I, Vin line withthe passage made lthroughthe collar and shaft andfor the reception of the pin.1 When each collar` vand its pin are adjusted totheir proper posi-` vtions the shaft A, willbe not only connectedy l to. thev two tubes I, I, but be free toturn around within them'while they are station,v`

ary.. The outerend of each tube H, is made toproject over that yof itstube I, as seen at d, d, and each tube I, is made to `extend beyond the' end` ofthe screw B, -within it as seenin Fig. 2. The' tube I, thusserves to` 'steadyfthej female screw tube H, and thereby prevent any lateral strain on the threads Of the male and female screws within it. Y The two tubes H, and I, of each screw B, operatf froln lateral `strain on the threads ofy the screws which Vwould otherwise occur orfbej likely totake'place if the screw tube H,"and 1 ing .together prevent 4those injurious effects iscrew'B, were used l.Without any outside or` incloslng tube I, as seen inthe drawings. By employing the two tubes H,V I, inconnection wit-h each screw- B, the 'screws are made 5to operate with veiylittle or no friction, consequent upon the klateral strain, yors tending ofthevscrew B, and nut tube H,.to

bend laterally when in usefand thus injure enced.

the screw threads, a difliculty' often` experty HavingV thus explained the method of conf. i

struc-ting the lifting machinery of the'jack, we now proceedto describe the kpeculiar lever and dog piece and other parts by whichthe shaft' A, and its screws are revolved either,

'in one or the opposite direction as circumstances may require.

The shaft A, has a two collars/N, O, (which play loosely 'on or around the shaft and are arranged outside of the ratchet wheels, kas seen in the drawings,) two parallel bars P, Q, (extending respectively from the collars,)V and across circular plate R, united to thebfars P, Q, the whole being as seen in t-he drawings.4 The frame M,lcontains or carriesthey'double dog piece S, which is disposed between the two bars P, Q, and works or plays on a vpin or fulcrum T, passes vertically through it and n s s 100,@ frame M, composed of Y l f part of the lever or key which lays in they the said two bars P, Q. Two teeth or dogs m, n, stand outfrom that'end of the'dog piece which s immediatel contiguous tothe ratchet wheels,\one of sai teeth being so ar- 2 ranged as to be made to play into one of the ratchet wheels, while the other is made to operate in the other ratchet wheel. AV

square head 0,'is made to project form, and make part of, the dog piece as seen in the drawings. It is f'adapted 'to a keyfor key lever U, whichhas Va square passage or hole made in one end vofrit for the purpose of receiving the said` square head.. The-'said lever is made to pass through a hole bored through the plate or circular piece R, andlof'a sizey or diameter equal to' that of the keyof the said lever. A notch V, is cut out of the side of the lever or key part thereof, and in that hole of the plae Bywhen the lever is fitted or placed on the square head of the dog piece.

Thesaid notch should be of a sizesuiiicient to allow ofthe movement of the dog piece on its fulcrum so-as tocarry or 'cause'to enter one of the two dogs `or teeth m, n, between any twoconsecutive teeth of itsratchet', and

so asto cause thedog to act against one of the said teeth and `thereby turn the ratchet wheel and shaft, when power is applied to the lever in the proper direction. ',When

that sideofV the key .pieceor key lever which is opposite to the notch, is borne in the opposite direction so as to rest against the side vof l the passage through the piece R), both of the teeth of the dog piece should Vbe moved out of or be out of action upon `their ratchets,"in`

order that the lever and frame M, may be moved around upon the shaft. g When next moved in anV opposite direction the notch of the lever will allow the lever to be moved so as to eause one of the teeth to take into 'its ratchetV wheel, and sq as, when the lever `is moved further,t`o cause a rotation of the shaft and its screws. By removing the lever from the square head of the dog piece, and reversing the lever or turning it 180 on its longitudinal axis and again applying it to the square head, the other tooth of the dog piece may be brought into loperation on its ratchet wheel in a similar manner and so as to reverse `the fmotion of the screws.

Therefore if we applyv the jack so constructed under a locomotive or heavy body,l we canV readily raise the same or lower it as occasion may require. A jack may be made tof operate with only one male screw B, female screw Gr, tube H, tube I, collar K, two ratchet wheels, frame M, and its dogged piece and lever, applied to a shaft A, b-ut we refer the jack made as represented in the rawings; or with two screwsB, C, and their.

adjuncts,jas we obtain thereby and by one movement of the lever double the rise or fall of a body acted upon by the jack than can be produced when the jack is made with but lone screw B, and in other respects as speciclaim a simple duplication `of a screw jack y and lever apparatus, but meaning to claim the combination of the two jacks or the double jack with but one levery apparatus in' the manner asspecied. w i

2. We also claim, the particular mannerin which we construct the key lever, the

frame M, and doggedpiece, so as'to operate togetherfas above explained; that is to say, the said keylever beingfmade with a notch V, and the said `frame M, being made with a hole through its end piece R, to receive said lever and allow itand the dog piece to oper.- ate 'and the other Vparts being constructed an 'applied `together as hereinbefore set L fOIth. 1

\ In testimonyy whereof we have hereto set our signatures this fifth day'ofApril, A. D.

FREEMAN ELLIS. .i

BENJAMIN S. BUCKLEY.A `z

Witnesses R. H.V EDDY, CALEB EDDY.

Images