USRE9153E - alerx - Google Patents

Description

c. B. ALBRO. vHoisating; Apparatus.

No. 9,153. Reissued April 13. I880.

MtEZLE SSBS 11214911 for 2 Sheets-Sheet 2.

CHARLES E. ALBBO, OF (3 HOISTIN SPEOIFIGATIONforming part of B To all whom it may concern:

Be it known that I, GHARLE the village of Cortland, in the county of land and State of New York, have i1 new and useful Improvemen Apparatus, which improvements are fully forth in the following specification and acc panying drawings, reference being had to said drawings, and reference marked thereon The object of my inven self-sustaining hoisting appa be on the differential principle.

ferent figures indicate the same parts.

Original No. 200,961, dated March 5, 1878.

s E. ALBRO, of

ivented ts in Hoisting to letters and figures of tion is to provide a ratus which may The mechanweights, as required'in machine-shops and for s for which the or- ORTLAND VILLAGE, NEW

G APPARATUS.

In the drawings, A, A, is the frame-work, whic ortstraius to which it will be B are swivel-h is evident. D is the who set the

are one or more ch which revolve on the chain-wheel H, b b b, an a a a are sprockets to slipping or sliding.

ism of the same is'placed in a suitable frameaxle 0 of which has the so work or shell, so that it can be used, like an less screw, ordinary pulley-block,to raise and lower heavy 0 having b the said frame-work, whic shown in the different figures, a of sufficient size and stre ooks on this frame.

el part of the endless screw. Fastened rigidly to the wh-e ain-pulleys, H H,

shaft or axle l I.

as shown in Fig. 2, the earings in the parts A and A UNITED STATES PATENT OFFICE.

YORK.

eissued Letters Patent No. 9,153, dated April 13, 1880.

Application for reissue .filed March 9, 1880. v

A A. A and A h is made in the form ml of metals ngth' to stand the subjected. B and Their use el part D all of In in chain-wheel H,

keep the chain from P is the drive-pulley, the

rew part of the endsaid axle of h parts are fastened to the other part by the screws on n.

the various other purpose dinary pulley-block and tackle and diflerential In Fig. 2 t and s are teeth on the wheel, and 2o pulleys are now used. 1' and d threads of the screw, showing how My invention relates to that class of hoistthey engage each other. ing apparatus in which the mechanism of the The drive-pulley P is fastened to the axle same is placed in a suitable frame-work, and O by the hub E and screw J. This drive-pulcan be hung up or suspended, like an ordinary ley P has sprockets :r, y, and z in its concave 25 pulley-block; and my invention consists in a rim, for the purpose of preventing the endless suitable frame, in which is journaled a shaft rope or chain used thereon from slipping or carrying one or more pulleys, and also one or sliding. more worm-gear wheels, in combination with In Fig. 3 M is the sheave of the snatchone or more screws mounted in bearings deblock; p, the axle of the same. T, T, and T 3o tachably secured to the frame, said screws beare guards. S is a hook in the same.

ing adapted to mesh with the worm-wheels, In the construction of all the parts of my thereby making the common endless screw, apparatus I make use of materials of such a and being driven by a drive-wheel, the whole size and strength as willstand all the strains being constructed to operate as more fully to which the apparatus will be subjected in 35 hereinafter specified. the use for which it is intended.

In the drawings, Figure 1 is a side view of Having thus described the construction of my self-sustaining hoisting apparatus. Fig. my apparatus, I will now proceed to describe 2 is a plain side view of another side of the its use and operation. apparatus, with part of the side broken away, The framework is suitably suspended by 0 showing the endless screw. Fig. 3 represents the swivel-hook B. Over the chain-pulleys H a front view of the wheel part of the endless and H is placed the chain. B and B. is the screw and the pulleys, with a portion of the chain. This chain then passes under sheave supporting-frame. Fig. 4 represents a view M, and the weight to be raised is connected showing the wheel part of the two endless. with the hook S. If the chain-pulleys H and 5 45 screws, the connecting spur-wheels, and a dif- H are constructed with different diameters, ferent arrangement of the chain-pulleys with then the chain R B passes over the said pulthe supporting-frame. Fig. 5 represents a leys on different sides of them, as shown in horizontal sectional view on the line a: w of Fig. 3, so that the chain B may unwind while Fig. 4. the chain R winds up, or vice versa. The o In the drawings, the same letters on the difchain B and R can be made endless.

By this construction it will be seen that a difl'erential motion is produced, and that comparatively little power is required to turn the pulley P, as the thrust on the screw on the axle O is only slight.

It will readily be further seen that the screw on axle 0, when turned by pulley P, imparts motion to the wheel part D; but the wheel part D cannot in any way impart motion to the screw on the axle C, from which it is plain that the apparatus is self-sustaining, and the weight must remain suspended at any point desired, and cannot run down.

It will be seen that when the chain is put on the chain-pulleys H and H, as shown in Fig. 3, the weight is raised very slowly; but when greater speed is required with a corresponding loss of power, I put the chains R and R on the chain-pulleys H and H, both on the same side, so that they both wind up, as shown by the arrows in Fig. l; but when put on in this way power is exchanged for space and time.

The chain R can be put, if desired, on only one pulley, as H, the other end being put on the hook B; or the otherend may be hitched direct to the weight to be raised. In this lat ter case one chain-pulley may be substituted in place-of the two chainrmlleys H and H, Fig. 4.

It will be readily seen that the important feature of my invention is the endless screw, with one or more chain-pulleys fastened rigidly to the wheel part of the said endless screw, and that the said cliain-pulleys can, if desired, be made tovary more in diameter than the sheaves in the ordinary difterential pulley, for the reason that the screw part of the said endless screw makes my apparatus absolutely self-sustaining, and it cannot run down; and, in addition, I get all the advantages of the power produced by the said endless screws.

It will be further seen that when great power is not'required I can dispense with one of the said chain-pulleys, and let the chain pass over the other one, and thus form a self-sustaining hoisting apparatus, which will be found cheap and convenient in many places where .great power is not required. Where very great power is required, and there may be danger of tearing the teeth 011 the wheel part D or of the endless screw, mounted at each side thereof, and the supportthe thread of the screw part on the axle (J, I make use of two endless screws connected together by suitable spurgearing, the wheel parts of the said endless screws being where the chain-pulleys H and H are in Fig. 1, and next to A and A", and one or more chain-pulleys between the said wheel parts of the said endless screws.

In the form and construction of the framework A, A A A, A and A the form shown need not be exactly followed; but the framework must be made strongly and substantially, with proportions adapted to the use for which it is intended.

I am aware that difierential pulleys operated by an endless screw have heretofore been employed in hoisting apparatus, and this I do not claim broadly.

What I claim is- 1. In the combination with the wheel part the differential pulleys ing-framc of the screw part journaled in detachable bearings A the whole constructed and arranged substantially as specified.

2. In a hoisting apparatus, the combination, with one or more pulleys of the wheel part, of two endless screws located one on each side of the pulleys and on the same shaft, and two screw parts gearing into said wheel parts, substantially as and. for the purpose specified.

3. In a hoisting apparatus, the combination, with one or more pulleys of the wheel part, of two endless screws located one on each side of the pulleys and on the same shaft, and two screw parts gearing into said wheel parts and journaledin detachable bearings, substantially as and for the purpose specified.

4. In a hoisting apparatus, the frame-work A A A A A A and swivel-hooks B B, substantially as described, in combination with one or more endless screws, the differential pulleys H H, drive-wheel P, and axle or shaft 1 I, all substantially in the manner and for the purpose herein shown and specified.

In testimony of which invention I hereunto set my hand.

CHAS. E. ALBBO.

Witnesses:

R. S. OHILoP,

ANDW. J. BOSWELL.

Images