US1325259A - Hoisting mechanism - Google Patents

Description

1,325,259. Patented Dec. 16,1919.

E. Y. MOORE- HOISTING MECHANISM.

APPHCATION HLED an. 2. Hill.

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E. Y. MOORE.

HOISTING MECHANISM.

APPLICATION man Ma. 2. Ian.

Patented Dec. 16, 1919.

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E. 'Y.' MOORE.

HOISUNG MCHAM$M. APPLICATION FILED II MI. 2. I911.

1,325,259. Patented Dec.16,1919.

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HOISTING MECHANISM.

APPHCATION FILED MAR- 2.19]?- 1,325,259, Patented Dec.16,1919.

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Specification of Letters Patent.

Patented Dec. 1 6; 1919.

Application filed March 2, 1917. Serial No. 151,888.

To all whom it may concern:

Be it known that I, EDWARD Y. Moons, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new Mechand useful Improvement in H oistin anism, of which the following is a fu 1, clear,

and exabt description, reference being had unitism of operation I may support a load at a pluralit of points and raise or lower it by a sing e operation, without changing the relationship of the points of support or tip ing the load.

Knother object is to combine such plural hoistin mechanism with a trolley support adapte to shift the mechanism laterally as a unit while reserving the relationship between the di erent lift members.

Another object is to render the power mechanism of the hoist simple and compact and at the same time efiicient in transmitting movement from a driving shaft'to an extended driven shaft which carries a lift pulley at some distance from the power mechanism.

In accomplishing the above objects, I preferably provide a power mechanism of invention operating a driven shaft on w ich are a plurality of lift wheels, over which flexible members extend to support the load. I provide aplurality of bearings for the shaft which are rigidly connected with the support to which the power mechanism is connected, and I couple the power mechanism to the shaft by a coupling allowing some independence of alinement, whereby binding on the bearings is prevented. When such hoistin mechanism is intended to be shifted latera 1y or trolleyed, I secure a pair of supporting trolleys to the supporting member which carries the power mechanism and bearings. Each of these trolleys may readily have four wheels tracking on the lower flange of an I-beam. Suitable means may be provided for rotatin the wheels of one of the trolleys to shi t the whole mechanism in and out. My invention comprises means by which I carryout the above features, as hereinafter more full ex plalned, and as summerized 1n the claims. Ii

In the drawings Figure 1 is aside elevation of a trolley hoist embodying my invention and having two separated lift wheels driven by a single power mechanism and each pro vided with a lift chain supporting a raising hook.. I call sucha hoisting mechanism a twin-hook hoist. Fig. 2 is a vertical section of the hoisting mechanism between the lift wheels; Fig. 3 is a vertical section through one of the trolle supports of the hoisting mechanism, as in icated by the line 3-3 of Fig. 1; Fig. 4 is a horizontal section through the power mechanism on the axis of the driving and driven shafts; Fig. 5 is a front elevation of the power mechanism with the hand wheel removed; Figs. 6 and 7 "arevertical cross sections through the power mechanism in planes parallel with Fig. 5, being on planes indicated by the lines 66 and 77 of Fig. at and each looking toward the central frame plate; Fig. 8 is a central vertical section of the power mechanism on the plane of the axes of the driving and driven shafts; Fig. 9 is a detail of the coupling between the power mechanism and the driven shaft, being a section on the line 99 of Fig. 1; Fig. 10 is a detail illustrating the means for racking the hoist by rotating the wheels of one of the trolleys, bemg a sectional elevation on the line 1010 of Fig. 3; Fig. 11 is a detail illustrating one of the double eccentrics for driving the yokes of the power mechanism; Figs. 12 and 13 are perspectives of the front and rear frame plates of the power mechanism.

As shown in Figs. 1', 2 and 3, 10 indicates the supporting member for the twin-hook hoist shown. This member is shown as a channel-beam with downwardly facing flanges. Resting on the top of the channelbeam at one end, and secured to it, is a plate 11; Bolted to the under side of this plate is the power mechanism 20. Secured t0 the under side of the channel-beam are bearing blocks 40 and 41. In these blocks is journaleol a shaft 50 which is coupled with the power mechanism by a coupling 60. On the shaft 50 are lift wheels 51 and 52 over which extend chains 53 and 54 which carry lift hooks 55 and 56. Each lift hook is shown as provided with a movable pulley, as 57 and 58, beneath which the chain extends, the other end of the chain being anchored at a suitable point to the bearin block 40 or 41. The whole structure descri ed is shown as supported by trolleys 7 0 and 71, which ride on the lower flange of an I-beam A,

tries designated I direction and extend 1 will now describe more in detail the various portions of the twin-hook trolley hoist above briefly described. I will first take up the power mechanism 20, though the same is not claimed herein but in my divisional application No. 169,817, filed May 21, 1917.

The power mechanism is mounted on a vertical central frame plate 21 which has at its upper end horizontal lugs 23 and 2a lying against the under side of the plate 11 and securely bolted thereto. The plate 21 is re cessed at its upper edge a shown at 2.5 to allow it to extend readily beneath the channel beam 10. The frame of the power mechanism includes, beside the central supporting plate 21, a front plate 26 and a rear plate 27 bolted'to the central plate. These plates 26 and are of the general form shown in Figs. 12 and'13 respectively, being stiffened by webs and having flanges 28 and 29, respectively, which abut correspondingly formed flanges on the central frame plate. The central frame plate is provided with suitable bosses 30 and 81, and the front and rear plates have ears 32 and 33 abutting against the ends of these bosses respectively. The cap screws 35 and 36 passing through the cars into the bosses hold'the structure together.

The driving shaft of the power mechanism is designated 80. It is mounted in the front frame member 26 and in the central plate 21. This shaft is rotated preferably by a hand wheel 81 mounted on the shaft and connected with it in a manner hereinafter described. A chain, not shown. is adapted to rotate the hand wheel.

Mounted on the shaft 80 on the inner face of the front plate 26, is a spur gear 83. This gear meshes with two other spur gears 8a and 85, which are rigid on shafts 86 and 87. These shafts are journaled in the central plate 21 and also in the other side plate 27. Between the plates 21 and 27 the shafts 86 and 87 are provided, each with two eccenrespectively 90, 91 and 92, 93. The eccentrics 90 and 92 lie in the same into circular openings in a yoke plate 95, which has internal teeth 96 around an opening in such plate. Similarly, the eccentrics 91 and 93 extend in the same direction, which is opposite to the two other eccentrics, and these eccentrics occupy circular openings in the yoke 97 which has internal teeth 98. The two sets of internal teeth work on a driven spur gear 101 which is located within the openings of both yokes and mounted on a driven shaft 100, this shaft being journaled in the central frame plate 21 and the rear plate 27.

The result of-the above construction is that, as the driving shaft. 80 is rotated, the

shafts 8'6 and 87, carrying the eccentrics,

are rotated,and the eccentrics .give the two yokes circular translations, or gyrations,

which cause their internal teeth to slowly carry around the driven wheel 101 and the driven shaft. It will be seen that the speed of the driven shaft is dependent on the difference in the number of teeth between the spur gear 101 and the internal gears on the yokes. That is to say, for each cycle of movement of the yokes the driven shaft is rotated such a portion of a complete rotation as the difference between the number of internal teeth on the yoke and the number of external teeth on the spur gear bears to the total number of teeth on the spur gear. The rotation of the driven shaft, therefore, is comparatively slow in proportion to that of the driving shaft, and thus the power is correspondingly increased.

To allow the power mechanism to operate rapidly in the direction corresponding to a descent of the load, enabling the load to run down freely when desired, I provide a ratchet device for the driving shaft controlled by a friction clutch between the hand wheel and shaft. The clutch is active on the raising movement, but is released by a relatively backward movement of the hand wheel to allow the shaft 80 to turn independently of the ratchet. Briefly, this mechanism consists of a cup 110 freely rotatable on the shaft 80 and provided with ratchet teeth 111 on its periphery adapted to be engaged by a pawl 112 carried by the front plate 25;. Within the cup are a number of friction disks 114 connected alternately with the cupand shaft 80. That is to say, the first disk may be connected at its inner periphery with the shaft, and the next disk at its outer periphery with the cup, and so on. Bearing against the front of these disks is a plate 115. Against this plate the rear face of the hand wheel hub bears. The forward end of this hub is formed. with an incline 117 which bears against an inclined collar 118, rigidly, though adjustably, secured to the shaft 80.

The inclinesbetween the collar 118 and the hand wheel hub are in the direction to force the hand wheel toward the power mechanism when the hand wheel is turned in the raising direction. Such operation, therefore, clamps the disks and locks the hand wheel to the ratchet cup. The teeth on this cup are in such direction that the cup may rotate freely under the pawl 112, in the raising direction of rotation. Accordingly, in the raising direction the hand wheel, disks and cup rotate as a unit, the ratchet teeth clicking under the pawl but being held thereby whenever the movement ceases.

To lower the load the hand wheel is turned in the opposite direction and this allows it to 1play back from the clutch, freeing the dis s so that the shaft turns independently of theratchet cup, and the load runs down so long as the hand wheelie kept in advance in rotation from that caused by the descendin load. Whenever this advance ceases the 10 is automatically held by the friction clutch, ratchet and pawl.

Such power mechanism as described, comprising broadly a gyrating internally toothed yoke driven by an eccentric, and the arrangement of two of such yokes operating concurrently, and the arrangement of the clutchcontrolled ratchet, are claimed in prior patents of mine, namely: Nos. 757,333, of April 12, 1904; 794,997, of July 18, 1905; and 946,253, of January 11, 1910. Such patents, however, show a different means for taking the driven rotation from the driven spur gear to the chain lift wheel. The conception of utilizing the power mechanlsm shown in those patents to operate a shaft connected with multiple lift wheels constitutes a portion of the present invention, as does also the particular arrangement of the power mechanism above descrlbed.

The power mechanism described causes a slow rotation of the shaft 100 for comparatively rapid rotation of the hand wheel. The shaft 100 is connected with the shaft 50, which has lift wheels, the latter shaft being mounted in the two bearings depending from the channel-beam 10. To prevent blndlng between the shaft 50 or the shaft 100 and their-bearings, I connect these shafts by a coupling allowing some independence of alinement. It is satisfactory to make this Coupling in the dental form shown in Figs. 1 and 9, where 61 indicates the hub of one member secured to the shaft 100 and having two substantially quadrant-shaped teeth 62, and 63 indicates a similar member on the shaft 50 having quadrant-shaped teeth 64 extendin between the teeth 62. The play between t e teeth of the cou ling is suflicient toallow the two shafts to e somewhat out of alinement and this prevents binding on the bearings.

The bearings for the shaft consist of the block 40 or 41 and the cap 42 secured to the under side thereof. Preferably the same bolts 43 which secure the block to the channel beam secure also the ca in place. These 50 bolts are through-bolts, s own as passin through flan es on the cap and block an through the c annel beam, and having heads on one end and nuts on the other. The block 40 or 41 is bifurcated at 45 to provide space for the lift wheel 51 or 52. A recess is also made in the upper face of the cap to provide for the lift wheel, and two openings through this cap for the passage of the lift chain 53 or 54. The lift chain is shown as depending in a bight and anchored at its u per end 59 to the ca 42. The lift hook 1s of the usual type an has a frame carryin a pulley which rests in the bight of the HE:

guide through chain and a suitable chain which the chain extends.

As heretofore stated, the twin hoisting mechanism, above described, may conveniently be supported and shifted as a unit by trolleys tracking on the under flange of an Lbeam. Such is the construction illustrated in Fi s. 1, 2, 3 and 10, which will now be descri d. Secured to the upper side of the channel beam 10 is a pair of blocks designated 120 and 121, to which the trolleys are connected. These blocks may be secured by the same bolts 43 which hold the bearing blocks 40 and 41. Each block has base flanges and an upwardly extending portion to which the frame of the trolley 70 or 71 is secured, preferably by a horizontal pivot pin 123.

The trolley frame consists of a pair of side members 124 and 125, extending upwardly on opposite sides of a space which may receive the I-beam fiange, and brought together beneath such space and secured by bolts 126. Each of the upwardly extending portions 124 and 125 carries a pair of studs 130, on which are journaled wheels 131 and 132. There are four wheels for each trolley, two on each side, whereby the trolley is effectively supported, and from it the hoistin mechanlsm described. By pivoting the tro ley to the hoisting mechanism a certain independence is provided, preventing strains due to any irregularities in the trackway and insuring the twin-hook hoist being supported by all the wheels of both the trolleys.

To mechanically shift the twin-hook hoist in and out, or rack it, as it is termed, I adopt means for rotating wheels of one of the trolleys. I have shown this in the case of the trolley 70 nearest the power mechanism. The wheels 131 of such trolley are each provided with a spur gear 140 rigid with the wheel. These two gears mesh with a pinion 141, Figs. 3 and 10, on a shaft 142. This shaft occupies a bearing in the trolley member 125, and is provided at its outer end with a hand chain wheel 145. The rotation of this wheel rotates the pinion 141 and thereby rotates the two wheels 131, and this shifts the whole mechanism as a unit, in or out as the case may be.

It will be seen from the construction described, that my twin-hook trolley hoisting mechanism is adapted to raise or lower two hooks in unitism, or to cause the same to travel lateral] as a unit whenever desired. This enables t e raising and transporting of a body which is either too large to be raised from a single hook or a body which it is desirable to maintain level b roviding two points of support. Han c ains, on the power mechanism hand wheel 81 and on the trolley hand wheel 145, provide simple mechanism for simultaneously raising or lowering the lifting members or for racking them in or out together.- uch two operations may be performed independently or simultaneously, as desired. The power mechanism itself is simple, compact, and very efficient.

Having thus described my invention, what I claim is:

1. The combination of a frame plate, trollys secured to the upper face of said plate; bearing blocks secured to the under face of said frame late; a shaft journaled in said bearing bloc s, a power mechanism within a frame depending from the frame plate adjacent to one end, said power mechanism having a driven shaft extendingfrom said frame toward the adjacent bearing block substantially in alinement with the first mentioned shaft, a loose-play cou ling connecting said shafts, and lift mec anism on the shaft first mentioned and supported within said bearing blocks.

2. The combination of a frame plate, trolleys having supporting wheels, bases resting on the frame plate and pivoted to the, trolleys, bifurcated bearing blocks on the underside of the frame plate beneath said bases, means rigidly securing the bases and bearing blocks to the frame plate, a power mechanism secured within a frame depending from the frame plate adjacent to one end, said power mechanism having a driven shaft extending from the frame thereof toward the adjacent bearing block, a shaft journaled in the bearing blocks alinement with the driven shaft of the power mechanism, a loose-play coupling connecting said shafts between the frame of thefpower in substantial in chanism and the ad'acent bearin block, 1i wheels on the sha within the %earing blocks, and lift chains extending over the lift wheels.

3. The combination of a frame plate in the form of a downwardly facing channel beam, trolleys having supporting wheels and bases pivoted to the trolleys on horizontal pivot-s, said bases restin on the upper face of the channel beam, bifurcated bearing blocks on the 'under side of the channel beam seated within its flanges, means rigidl securin the bases and the bearin bloc s to the c annel beam, a power mecianism secured to the channel beam and depending therefrom adjacent to one end, said power mechanism having driving and driven shafts and a frame providing bearings for said shafts and gearing connecting the shafts, the driven shaft extending from said power mechanism frame toward the adjacent bearing block, a shaft journaled in the bifurcated bearing blocks in alinement with the driven shaft of the power mechanism, a loose-play coupling connecting said shafts between the frame of the power mechanism and the adjacent bearing block, lift wheels on the shaft within the spaces of the bifurcated bearing blocks, and lift chains extending over the lift wheels.

In testimony whereof, I hereunto affix my signature.

EDWARD Y. MOORE.

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