US794997A - Hoist. - Google Patents

Description

No. 794,997. I PATENTEDJULY 18, 1905.

E. Y. MOORE.

HOIST.

APPLICATION FILED 1330.12, 1904.

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No. '794,997- PATENTE D JULY 18, 1905.

E. Y. MOORE.

HOIS'I'.

APPLICATION FILED D30. 12, 1904.

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PATENTED JULY 18, 1905.

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HOIST. APPLICATION FILED D30. 12, 1904.

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UNITED STATES Patented July 18, 1905.

EDWARD Y. MOORE, OF CLEVELAND, OHIO.

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SPECIFICATION forming part of Letters Patent No. 794,997, dated July 18, 1905. Application filed December 12, 1904. Serial No. 236,424.

To ztZZ whom, it may concern:

Be it known that LEDWARDX. MOORE, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented a certain new and useful Improvement in Hoists,of which the following is a full, clear, and exact description, referencebeinghad to the accompanying drawings.

Hoists in order to be self-sustaining and at the same time eflicient must have some brake mechanism operating to prevent the descent of the load, but not interfering with the raising thereof, for if the ordinary friction of the hoist itself is relied upon to prevent the load descending the efliciency in raising is correspondingly reduced.

The object of this invention is to provide a hoist with very efficient brake mechanism preventing the load descending without interfering with the elevation thereof. The invention is hereinafter more fully described, and its essential characteristics set out in the claims.

The drawings show my invention embodied in a hoist of the general type covered by my Patent No. 7 57 ,333, issued April 12, 1904.".

Figure 1 is a vertical central section of the hoist complete. Fig. 2 is a side elevation thereof looking from the side opposite the hand-wheel. Fig. 3 is a plan of the hoist. Fig. I is a vertical section on the line 4 4 of Fig. 1 looking to the right. Fig. 5 is a vertical section of the hoist on the inner side of the hand-wheel, showing the brake. Fig. 6 is a side elevation of the brake-cup with the friction-disks removed. Figs. 7 and 8 are views of the fiber and metal disks of the brake, respectively. Fig. 9 is a view of the coverplate of the brake. Fig. 10 is a perspective view of the collar which carries the brake.

Fig. 11 is a perspective view of the cam-collar by which the brake is set; and Fig. 12 is a view of the locking-nut, broken away to show the clutch collar and shaft.

The frame of the hoist, as shown, consists of two side members A A, secured together at their ends. Between these members is secured a cross-head B, to which is swiveled the supporting-hook O. Between the side members of the frame is the lifting-chain pulley D, which is shown as rotatably mounted on a sleeve G, carried by the frame members A A, and itself forming a portion of the frame.

Formed on the exterior of the main pulley D is an external gear (Z, and surrounding this gear is a yoke-piece E, which has internal teeth 0 of a greater number than the gear d. The yoke-piece is given an orbital non-rotative movement by a pair of eccentrics K K on shafts J J, journaled in the frame and carrying on their ends gears L L, with which mesh a gear H on the end of the main driving-shaft F. It thus results that when this main driving-shaft is rotated, as by means of the hand-wheel N, the yoke E is gyrated and the gear d and main pulley D is given a slow rotation. Frictionrollers M may be employed between the eccentrics and the yoke, as shown.

The construction above described is set out more at length and claimed in my prior patent above mentioned, to which reference is hereby made for a fuller description.

In order to prevent the load descending, I provide the brake mechanism, which is the essential feature of the present invention, and which will now be described.

Rigidly mounted on the main shaft F outside of the frame member A is a collar P. (Shown more particularly in Fig. 10.) This collar has a flange p, which rests against the frame-plate A. Immediately outside of the flange is a cylindrical portion 12, and outside of this is a square portion p with rounded corners. Mounted on this collar P, bearing against its flange p and surrounding its cylin drical portion, is a metal cup Q. This cup has a flat circular interior surface q, surrounding which is a cylindrical wall 9. Within the cup are series of alternately-placed fiber and metal disks. The fiber disks are designated S. Each is bounded by a circle and has a square central hole adapted to take over the square portion p of the collar P, Wherefore the fiber disks are compelled to rotate when the shaft F rotates. Alternating with the fiber disks are one or more metal disks R. The metal disks have circular holes which bear on the rounded corners of the square projection p ,.while at their peripheries they have short projecting wings 0 which are adapted to oc cupy recesses (J2 in the wall of the cup. The various disks are retained in place within the cup Q by a metal cover -plate T within the wall of the cup and having circular hole surrounding the boss 19 The plate has at its periphery wings t, which extend across notches or recesses 9 formed in the wall of the cup. Within these notches are springs V, bearing on the wings t and tending to press the coverplate outward. Holes S in the fiber disks carry graphite or other suitable lubricant. The cover-plateT is held in place by the handwheel N, which bears against its outer surface. This hand-wheel is free to turn slightly on the shaft. On the hub 91/ of the handwheel are formed a pair of oppositely-placed inclines if within notches n Secured by a feather w to the shaft F is a collar W, which has a pair of lugs w, adapted to stand within the notches n. The faces of these lugs are beveled complementary to the beveling of the inclines of. There is some play between the sides of the lugs w and the notches which they occupy, wherefore the hand-wheel is allowed slight independent movement. Such movement of the hand-wheel forces thehandwheel inward by reason of its inclinations a riding up on the inclinations w, and this forcesthe cover-plate T snugly against the disks, pressing them against each other to effect braking. The cam-collar is adjusted in position by the nut X, locked in place by the setrscrew On the periphery of the cup Q are formed ratchet-teeth g and with these teeth engages 'a pawl Y, pivoted to the frame member A and forced by a spring y into engagement with the ratchet-teeth. This pawl and the ratchet-teeth are placed in such direction that .the cup Q can rotate idly beneath the pawl when turned in the direction in which the shaft turns to elevate the load. The inclinations 01 and w are in such direction that when the hand-wheel is turned to elevate the load the hand-Wheel is forced inward by the inclinations, which movement clamps the disks and causes the cup Q to rotate, the pawl Y clicking idly over the teeth Q. When the load has been elevated and the raising rotation of the hand-wheel ceases, the load tending to run down holds the brake set as before; but the pawl Y prevents the cup Q rotating in the opposite direction, and the load is thus held at whatever point it may be. When it is desired to lower the load, the handwheel is turned in the reversedirection, which causes its inclinations n to travel down the inclinations w of the collar W, releasing the brake and allowing the load to descend. During descension the hand-wheel, by means of its chain, is always kept in advance of the load. To stop the descent, the movement of the hand-wheel is simplystopped, and the load thus turns the shaft F, moving the cam projections w on the inclines 17, and thus forcing inward the hand-wheel and resetting the brake.

The above-described mechanism provides a very eflicient automatic brake and one that is durable and not liable to get out of order. The fiber and metal disks are capable of long wear and are easily replaced when worn out. The lubrication of the disks by the graphite insures the brake being regular in its action, preventing jerking as well as heating and cutting.

I claim 1. In a hoist, in combination,hoisting mechanism, a driving-shaft therefor, a friction member rotatable around the shaft, friction-disks surrounding the shaft, one of which is held near its periphery by said member and another of which is held near its center by a non-circular contour on said shaft, means for rotating the shaft, and means operated thereby for compressing said disks.

2. In a hoist, in combination, hoisting mechanism,a driving-shaft therefor, a collar on said shaft having an angular portion, a cup journaled on said collar, a series of disks within the cup and mounted on said angular portion, said disks being alternately held by the angular portion and by the wall of the cup, means controlling said shaft, and means operated thereby for compressing said disks.

3. In a hoist, in combination, arotatablymounted cup, means for preventing its rotation in one direction, a series of disks within said cup, one of said disks having wings occupying recesses in the wall of the cup, another of said disks being rotatable independently of said cup, hoisting mechanism, and driving mechanism therefor adapted to rotate said independently-rotatable disk and press said disks together.

4. In a hoist, in combination, a rotatablymounted cup, means for preventing its rotation in one direction, a series of disks within said cup, one of said disks having wings occupying recesses in the wall of the cup, a shaft extending through said cup and carrying another disk, hoisting mechanism operated by said shaft, a hand-wheel on said shaft, and means whereby the rotation of the hand-wheel may cause it to press said disks.

5. In a hoist, in combination, a frame, a shaft carried thereby, hoisting mechanism 0p erated by said shaft, a hand-wheel loose upon said shaft, a collar upon the shaft and connected with it, said collar and hand-wheel havingcooperatingprojectionsandnotchesloosely receiving them and having cooperating inclined faces whereby the rotation of the hand- Wheel relative to the collar may force the hand-wheel along the shaft, a brake adapted to be engaged by such movement of the handwheel, said brake consisting of a series of disks and a containing-cup, the disks being connected alternately with the shaft and the toward the disks.

7 The combination of a rotatably-mounted cup, a shaft placed axially of said cup and rotatable independently thereof, disks within the cup alternately connected with said shaft and cup, a cover-plate for compressing said disks, and a hand-wheel adapted to force said cover-plate toward the disks, said cover-plate having projecting wings occupying recesses in the wall of the cup, and springs occupying such recesses and engaging such wings and tending to force the cover-plate away from the disks.

8. In a hoist, in combination, a frame, a

. shaft journaled therein, lifting mechanism driven thereby, said shaft carrying an angular portion with rounded corners, a series of disks surrounding the shaft, said disks being alternately rotatable on the rounded corners of said shaft and connected with the shaft by means of its angular portion, means for holding against rotation one of the disks free from the shaft and means for compressing said disks.

9. In a hoist, in combination, a driving-shaft carrying an angular portion with rounded corners, a series of disks surrounding the shaft, said disks being alternately rotatable on the rounded corners of said shaft and connected with the shaft by means of its angular portion, means for holding against rotation one of the disks free from the shaft, a cam-collar on the shaft, and a hand-wheel on the shaft engaging the collar and adapted to be forced toward the disks when rotated relative to the collar.

10. In a hoist, in combination, a frame, a shaft journaled therein, lifting mechanism driven thereby, a friction-brake, a cam-collar on the shaft, a hand-wheel on the shaft engaging the collar and adapted to be forced toward the brake when rotated relative to the collar, said collar being compelled to rotate with the shaft but slidable upon it, and a nut screwthreaded onto the shaft and adapted to adjust the collar.

11. In ahoist,in combination, a frame,hoisting mechanism carried thereby, a frictionbrake for the mechanism including a cup having a fiat interior face and a surrounding wall with a recess in it, disks within said cup, one of which has a projection on its periphery occupying such recess, and a presser-plate for said disks, said plate occupying said cup and having wings extending into recesses in the wall thereof, and springs engaging said wings and tending to force said presser-plate out of the cup.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

EDWARD Y. MOORE.

Witnesses:

ALBERT I-I. BATES, L. N. BRESNAN.

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