US552044A - Machine for lifting stone - Google Patents

Description

. (No Model.)

E. J. GRCHQKERE Mmmm EUR MFTING sfoNE, STUMPS, m.

Pawe Een. 2 4, l895- i I .1j A Y y v r N Y .To ali whom may concern.:

' load. Figs. 4 and are details'to be referred to.

' frame of the machine, 'which is provided at l tached'to sheers'B or other suitabl'support. 35

saine ateach ende formngpixzotsnn mhichis forked, as shown in Fig. 4,.to. embrace the engaging the sprocket-Wheel C, which is pro- 4S' lowered and causedito successively engage .tain novel combinations of parts and details UNITED STATES PATENT Fries.

HENRY J. oRooKER, or LAcoN'rn, Nrw nnriisninpli MACHINE FOR LFTING STONE-STUMPS, 8nd.

SPECIFICATION forming part of Letters Patent No. 552,044, dated December 24, 1895. i

Application filed November 1,'1895. Serial No. 567,649. (No model.) I

Beit known that. I, HENRY J. CROOKER, a citizen of the United States, residing at Laconia, in the county of Belknap and State of New Hampshire', have Ainvented certain Improvements inMachines for Lifting Stone, Stumps, dotiierdeavyrticles, ofV which` the following isa full, clear, and exact description, reference being had to the accompanying drawing s,`making part of this specification, .in whicl1`l Figure l is a side elevation of my improved machine, showing the .parts in the position they occupy in raising the load. Fig 2 is an end elevation of the machine. l 3 isasidef` elevation similar to Fig. l, showing the parts in the position they occupy in lowering the My invention relates to certain improve-z ments in machines for lifting stone, stumps, and other heavy articles, and has for its object to improve the construction of such machines, whereb7 they may be operated with a single hand-lever to raise or lower the vload more easily and conveniently th an heretofore; and to this end my invention consists in cerof construction, as hereinafter 'set forth' and specifically claimed. v In the said drawings, A represents the its upper end with a swiveling-hook a to adapt it t9 resuspended. from' a clavie af'- C is a chain Qrfsprocket wheel which rotates between `the sides of the frameA -npon a. shaft or spindle b, passingthrongh said f rarnei -andprojecting a short distance beyond' the fulcrumed along hand-leverD, which is frame A -'gj-fl G is the-hoisting-chain passing around and vided with side flanges having' ratchet-teeth 10, which are engaged by the operating-pawl H,made in the form of a stirrup or loop, as 'shown in Fig.4 2, and having i ts two ends pivthe two branches, of the lever D, whereby as the latter is operatedthe pawl H is raised and the ratchet-teeth -10 and rotate'the chainwheel to raise the load as desired, an eXceedingly powerful leverage being exerted in con- 51 sequence of the short distance between the` pivots e e and the ends ofthe Vshaft b,'on

vwhich the hand-lever is fulcrumed, and as tact with the ratchet=teeth 1 0 of the chrfe iiliel'byligltspring h, Fig. 2, coiled around A the rod g.

7e is a spiral spring, one end of which is fastened to onev end of the shaft L, its opposite 7o end being connected with andadafpted to slide-fl upon a Wire loop m, projecting froiiithe inner Aend of one side of the operating-pawl H, said lloop extending an equal distance on both sides of thepivot'alwpoint e of said pawl, so 75 that by shifting the spring to the left-hand end of the loop, as shown in Fig-1, it will exert a downward draft or pull upon the pawl H to keep the same in contact with the ratchet-teeth when vthe load is being raised, 8o

while when the spring k is shifted to the opposite or right-hand end of `theloop, as shown in Fig. 3, it will exert an upward draft or pull upon the pawl-as required in the operation of lowering the load,.as hereinafter described.' 85

notch 12 at each end to' retain the springt in place when adjusted, and'by securing the sprirg la to the shaft b it will act with a uni- ...form tensionon `the pawl H to raise or de`. .gef .nresstheisame in anyhposition of the handlever. M isa bent-wire spring, `one end of which is permanently fastened to the frame A at 14, the opposite end being detach'a|i1 secufredT 95 to a pin l5 projecting from the retaining-patri" f, said pawl being connected with the spring,

` as shown in Fig.v 3, only when thelload is being lowered, and being disconnected therefrom, as shown in Fig.'l, when the load is ro'o being raised. The spring M is vprovided with an inclined portion 20,which,when said spring isconnccted withv the Apa'wl f, lies in the path of il ic pawl ll, which, as it is raised, is brought into Contact therewith for a purpose to be presently explained, and beneath the portion 2O the spring is provided with a projection 21, which, whenstruck bythe pawl H, causes the spring tobe compressed in such manner that it will raise the retaining-pawlf against the resistance of its spring h and thus release Y the cl1ainwheel as necessary in lowering the chain-wheel, and as soon as the pawl has'fairly engaged these teeth it strikes the projection '21, and by its pressure thereupon the handlever is still farther depressed causes the up-- perv arm of the spring to raise the pawl j', as shown in Fig; 3, against the resistance of its spring 7L to release the chain-wheel C and permit the load to be lowered under the control of the hand-lever D, the weight of the load having been taken off the pawl f to permit it to be raised by the spring M 'by the slight movement of the chain-wheel as the hand-` lever was depressed'tobring thepawl l1 inte contact with the projection 21. .As the handlever is allowed 1oy the hand to rise in lowering the load, the pawl H remains in contact with the spring M long enough to prevent the retaining-pawl f from dropping hack into the ratchet-teeth from which it was last raised 3 but as soon as the projection 2l. of the spring .M is relieved of the pressure of the pawl li ."jf pawl` f is carried down by its spring 7L into a position to engage the next two opposite ratchet-teeth ready for a repetition of the lowering operation7 the loadloeing low ered one notch only at a time and there being no possibility of its slipping or getting away from the controlv ot the person operating the mach ine.v

If it should be desire(l to use a pulley, the chain can he passed through the block and hooked into the loop p at the bottom of the frame A, in which case greater lifting power Iwould be exerted with a slower movement oi' .the load, or if desired 'the chain can be merely passed under the article to be raised and hooked into the loop p.

.ly means ot' the above-described machine a load can be easily lowered. by one person, as the retaining pawl is 'operated automatirally by the .movement of thc hand-lever to elcasc the channvheel at the desired time.

and not liable to get out of order.

vVhat I Claim as my invention, and desire to secure by Letters Patent, is

l. In a machine for lifting stone, stumps, rite., the combination with the frame, of the chain-wheel prov ided withratchet-teeth and mounted on a shaftsupported in said frame, the handy lever fulcruined in line with the axis of the chain-wheel, the operating-pawl pivoted to the hand-lever near its fuleruin and engaging the ratchet-teeth of the chain-wheel said pawl carrying a loop at its'inner end, a spring connected with said loop and adapted to be shifted to either end of the same to producea downward or upward draft on the said operating-pawl, a retaining-pawl f, for the chain-wheel, and the spring M, detachably connected with the pawl f;said spring serv- -ing to throw the operatingpawl' into the ratchet-teeth of the chain wheel in the operation of lowering the load, .and when acted upon by said operatinglpawl, raising the retaining pawl out of engagement with said ratchet-teeth to release thechain wheel and permit the load to b'e lowered under the con "forth y 2. In a machine1 for lifting stone, stumps, the., the combination with the frame A, ot the chain-wheel C, mounted on a shaft h, support-'ed in said frame, said chain-wheel being provided with side-flanges having ratchetteeth, 4the hand-lever D, fulcrumed on the ends of the shaft b,.the stirrup-shaped pawl H, pivoted at e,'e, to the upturned ends of the hand-lever near its fulcrum and engaging the ratchet-teeth of the chainwheel, the loop on, secured to the pawl-II, and extending on each nccted with said loop and adapted to be shifted to either end of the same .to produce a downward or upward draft on said pawl I I, the retaining pawlf, for the cl1ain-whee1, and the spring M, detaehahly conneited with thc l I pawl j, and provided with an .incline 2U, for throwingthe pawl l-I, into the ratchet-teeth of thc chain-wheel in the operation. oi lowering the load, and having a projection 2.1, adalpted to be struck by said pawl II, whereby the spring M, is caused. to'raise the pawl 7, ont ol' engagement with the ratchet-teeth olf thc chain -Wheel to release tho same, all constructed to operate substan tall)- asdesuribed. lNitness my hand this 30th day of October, A. l). 1895.

HENRY .L CROOKER.

In presence of .DANisL KnLLoGo, JAMES il. lIARKiNs.,d

Furthermore, the machine is simple, durablm trol of the hand-lever, substantially as set' IOO side of its pivotal point, the spring k, con` IlO

Images