US413004A - weston - Google Patents

Description

i (No Moden) sheets-smet 2. T. A. WESTON.

HOISTING MBGHANISM.

' No. 41s,oo4.- Patented ont. 15, 1889.

' NvENToR By his www Thomas Wston 'wlTNEssEs (No Model.) 4 sheetssheet 4.

T. A. WESTON. HOISTING MBGHANISM.

No. 413,004. Patented Oct. 15, 188.9.

Thomas veston .By hsttomeys UNTTen S'TnTns PnTnNT Y THOMAS A. WESTON,A 0F lAMlfORD, CONNEC' 1(U'l", ASSGNOR TO THE YALE da TOVNE MANUFACTURING COlliPNY, OF SAME PLAGE.

" HESTNG MECHANESM.

SPECFICATION forming part of Letters Patent No. 413,004, dated @Ctober 15,1889,

Application filed October 105 1887. vSerial No. 251,953. (No model.)

To all whom it may concern;

Be it known that I, THOMAS A. "WESTON, of

Stamford, iu the county of Fairfield and State of Connecticut, have invented certain new and usefnl improvements in l'loisting Mech-- anisms, of which the following is a. specification.

My invention relates, primarily, to portable and fixed hoists employing a type of gearing known to mechanics as sun-and-planet gearing, some Vfeatures of my invention being` more genera' ly applicable, as will appear hereinafter. Prominent features my invention are- First. A special arrangement of the n1echanism and framework of the hoist, wherein the main lifting-shea'vo is placed within the machine between the two frame sides and upon a hollow shaft, the driving-pulley exterior to the frame on one side of the machine, anda system oi' sui1-ancl-planet rearing ente rior to the frame on the other side of the ma chine. l thus obtain a compact andsymrnetrical construction o'f a sni. andplanet-geared hoist having the minimum of friction with the load-chain and suspension-hook very nearly in the vertical central line of the maof a hoistembodying chine.

Second. A11 independent cam and roller check-wheel to check the backward motion of the machine, the said check-wheel being,` a separate piece 'not integral with any other and therefore easily renewable by itself, and so applied to one of the two parts between which the check action is desired that the excessive radial strains of the cam -faces and rollers are wholly avoided, being self-contained within the body of the said part, and thus kept from distorting the machine'in which the device is incorporated and from frictionally impeding its free motion.

Third. A peculiar yoke or hanger whereby 4the machine is suspended or supported, the

pivotal motion of which yoke, caused by its -oblique position in regard to the entire ,loadstrain upon it, serves to operate a frictionbrake to sustainthe load.

I am aware that heretofore there have been 5o mang7 prior inventions or devices having obside E.

a plan, the neclof the siis1'ie1isi'o1i-hookbeingv Fig, 2 is an elevation ofthe shown in section. outerand geared side of the machine, showing the suspension-hook as broken away. Fig. 3 is an elevati ci the other outer side, haird ing the drivi `A;-puliey broken away partly to expose thecam check-wheel and rollers, and the suspension-hook broken away. l is a vertical section Vwith the suspension hook shown as broken away..

A. is the tocthedliftii'xg-sheave, attached to thehollow main shaft l. "lhc sheavc A has its periphery formed to engage with the links of a liftinggchain having; at its lifting cndthe usual hook. The shaft B is carried by bearings in the framesides l) and ll.

C is the driving-sheave, loperated by the usual endless hand-chain, and it is keyed to the shaft C', the latter turning within the shaft E. The shaft C carri 3s a pinion Cthe latter engaged with the equal planet-pinions B4, which tnrn onpivots B3, carried by and revolving' with the flange l of the hollow shaft. To the iiange l is attached a ring or frame B2 to support the outer ends of the pivots 153. The pinions i34 also engage with the fixed annular wheel D", forming part of the frame side D. The two frame sides D andE are' united by three studs F h" Fi, only one of which F" is shown in Figs. 3 and andthe other two are shown in Fig. l, the stud F forn'iing the pivot of the yoke G. The yoke G has an ordinary hooi; G and a side horn To the horn G? is attached one end of the brake-strap li, the other end being se cured to the horn lfl, cast upon the frame rl`he frame side E, by a central boss or bearing' E2 on its outer side, supports a brake-pulley i, embraced by the strap ll. lVithin' the pulley l', in an annular recess l', is placed the cheek-wheel Il, having its pe- IOO fined to its own cam-surface by projections K. The latter carry the rollers around with the rotations of the check-wheel K one way within the annular recess I of the pulley I. The contrary motion -of the check-wheel K within the recess I is prevented by the wedging action ofthe rollers between the ro cam-surfaces K and the opposite inner annular rim of the recess I.l The check-wheel K has on its side a horn orflug K4, embraced by a slightly-larger opening in the driving-pulley C, whereby the said parts C and K are loosely engaged or clutched to each other, so

as to rotate or to be at rest together. The said cam and roller checking device is old in its main features. It is shown in a somewhat improved form as the subject of claim No. 7

2o in the specification of my United States Patent No. 333,906, January 5, 1886, and in this my-present invention -I have further and substantially improved it by making the checklwheel K a separate piece by itself, not inte- 2 5 gral with any adjacent piece, but placed within an annular recess I in thexp'ulley I, sothat all its severe radial strains from its cam action on the rollers are received upon andv confined vbetween two opposing concentric walls 3o of the recess I in the body of the pulley L In all former constructions of 'this device its severe strains take full "effect upon the bearings to which' it is applied, tending to separate the said parts from each other and causing excessive journal-friction.` The sepaxrate casting K, .with its rollers, furnishes a pawl or check device between the pieces C and I. It is integral with neither, but is loosely clutched with the sheave (l and intermittently fao connected with the pulley I by the slipping and cam action of its cam-surfaces and rollers.`

The' check-wheel K, exposed to the severe indenting action of the rollers on its cam-surfaces, is by this my construction easily renewable when worn Awithout replacing therewith any adjacent part, and 4its cam-strains cannot pass beyond the annular recess containing it.l

The yoke G, pivoted upon the stud F, is held 5o' thereon obliquely to the strain-line ofthe load by its attachment to the strap II. The tendency of the yoke Gto straighten into the line of the load-strain thereon tightens the strap H around the pulley Iwith varying force as the-load varies.. The pulley Lthus frictionally grasped by the strap H, becomes an abutment to the check-wheel K and sheave C, thus affordingthe needful check'or selfsustaining action'l against the backward moo tion of the hoist and the running down of the load when the operatorlets go thethandrchain/ upon the sheave- C. He can lower the load, however, by driving the sheave C backward, and with ,it the brake-pulley I, against the 65 frictionalresistance of the strap H.

' The hoisting motion is as follows: Rotary motion being applied to the sheave C and shaft C,`its sun pinion C)2 causes the,

planet-pinions B fo roll around the fixed an- The pinions B4 therefore not only rotate upon their own axes or pri-vets,

f but at the same time rotate around the main .center or axial lline of the shaft'C and its pinion C2. In the latter motion or orbit the pmions BJg carry with themv the flange B', on 'which they are pivoted, the hollow shaft B,

the sheave A, and the chain thereoiilland thus lift a suspended load. The said hoisting motions are indicated by arrows upon the sevF veral parts in Figs. 2 and 3. The reverse fno-- tion, by continually overhauling the hand- .chain','constitutes the slow or safety lowering motion explained above. A rapidor ordinary brake-lowering action is provided las follows: H3 is 'the brake-lever, pivotfed to the frame side D. When not in use, the said lever folds across the frame side, as shown in Figs. 1 and 2.- For use'it is swung out radially, as shown by dotted' lines 'in Fig. l1'. Tol its outer end H4 a cord is attached, and by the said cord and lever the block or hoist can be swung bodily or turned slightly upon the pivot F in the direction of the long curved arrow W, Figs. 2 and 3. The said movement'unwraps or slackensv the strap H from the pulley I, and thus theA load can be lowered at any desired speed. Upon -ceasing thus to defiect the block from its normal position the load-strain at.

once restores it thereto and automatically applies the brake, as already explained, the hoist and load being automatically self-sustaining always when left alone.

I claim as my invention- 1. The combination, with a hoistfram`e,'of l' a driving-sheave exterior to the frame on one side thereof, a train of sun-and-planet gearing exterior to the frame on the other side thereof `and carried on the flanged extension of the hollow shaft, a drivin g-sh aft upon which said sheave is fixed, and which gears with and gives vmotion to said train of gearing, a hollow shaft journaled in the two sides of the frame through which said drivingshaft passes, and the main lifting-sheave carried on said hollow shaft, substantially as 'set vforth.

2. VThe combination, with a'hoist-fraihe provided With a train of sun-and-planet gearing, of a mainlifting-sheave secured toa hollow rotatory main shaft, the latter j oui-naled at each end in the frame, and provided witha flange exterior to the hoist-frame and carrying the planet-pinions, and within the said rotatory hollow main shaft a drivingvsxhaft, substantially as set forth. p

3. The combination, 'with a hoistframe, f

a purchase-gearing consisting of a drivingslieave'and its attached shaft, the latter jurnaled within a hollow main shaft, a driving# `wheel integral with the hoist-'frame and external thereto, the said planet-pinions pivoted j, to and driving a flange or disk integral with the main hollow shaft, and the main hollow shaft journaled at each endi'n the frame and attached to a main lifting-sheave, substan-` y tially as set forth.

4. In a portable hoist, the combination of.-

the hoist-framein two parts D E, connected together by studs, as shown, said part D being provided with the annular ange D, the lifting-sheave A between the 'two parts D E, the hollow shaft B, to which the sheaye is fixed, provided with the flange B', the pinions B* thereon, the drivinglpinion C2 and its shaft C', brake-pulley I, check-wheel K and rollers, brake-strap H, and yoke G, substantially as set forth.

5. In a portable hoist, the combination of the hoist-frame in two parts D E, connected together by studs, as shown,said part D being provided with the annular flange D", the lifting-sheave A between thetwo parts D E,

-the hollow shaft B, to which the sheave is fixed, provided with thev flange B', the pinions B4 thereon, the driving-pinion C2 and its shaft C', driving-pulley C, brake-pulley I, check-wheel K and rollers, brake-strap Il, yoke Gr, and brake-releasing lever H3, substantially Vas set forth.

v6. In a portable hoist, thev combination, with pulleys between which a check action is effected, of a separate cam check-wheel,which, 3

- with its rollers, occupies an annular groove in the body of one offthe said pulleys and is loosely clutched to the other,'substantially`as set forth. j l

7. In aportable hoist, thev combination of 9. The combination, in a hoist embodied in a pulley-block fian1e,'of a strap-brake, and a pivoted'yoke', which is attached tothe :Suspension-hook, whereby the brake is operated 35 thel pulley' C with the brake-pulley Landby the weight of the hoist and of any load 5o thereon, and an operating-lever for withdraw f ing the vbrake frein action, substantially' as setforth. v

In testimony whereof I have hereunto snb'- scribed iny naine.

A THOS, A; WESTON.

Witnesses:

SCH'UYLER M ennrm,

Gno. E. WHITE.

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