US1419155A - Hoisting mechanism - Google Patents

Description

n. F. LEP'LEY.

HOISTING MECHANISM.

APPLICATION FILED IAN.A22| 1921.

Patented June 13, 1922.

5 SHEETS-SHEET 2.

D. F. LEPLEY. A

HOISTING MECHANISNI. APPucAnoN. FILED 1AN,.22, 1921.

Patented June 13, 1922.

5 SHEETS-SHEET 3.

'D. F. LEPLEY.l

HOISTING MECHANISM.

APPLICATION FILED 1'AN.22, 1921.

Patented June 13, 1922.

5 SHEETS-SHEET 4.

D. F. LEPLEY.

HolsuNG MEcHAmsM.

APPLICATION FILED IAN.22, |921.

Patented .Time 13, 1922.

5 SHEETS-SHEET 5.

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HOTSTNG- MECHANISM.

Specification of Letters Patent.

Patented June t3, 1922.-

Application iled January 22, 1921. Serial No. 439,207.

To all w/Lom t may concerti.

Be it known that l, DANIEL F. LnrLnY, a citizen of the United States, residing at Connellsville, in the county of ayette and State of Pennsylvania, have invented a new and useful Hoist-ing Mechanism, of which the following is a specification.

This invention relates to mechanism for hoisting mine cages and the like, one of its objects being to provide mechanism for slowing down and stopping heavy high speed electric and steam hoists where, after the power is shut oli, the drift of the hoist and cages is very pronounced, and during which interval the load on a large alternating current hoist motor is so reduced that the magnetic control has practically no speed reducing effect on it. For this reason it has become almost a universal practice among hoist operators to shut off the motor controller entirely two or three seconds earlier than the predetermined hoist cycle demands, thus to allow the hoist and cages to drift from that point to the landing to insure safety. As soon as the power, is shut oil', however, the hoist begins to slow down and in most cases the retardation period is practically double so that there is a corresponding reduction in the capacity of the hoist.

One of the objects of the present invention is to provide means whereby the operator is enabled to maintain the maximum hoist speed throughout the entire allotted cycle with the certainty that the hoist i ill stop itself automatically and gradually within the allotted slow-down period before the cages reach the danger point.

Another object is to provide mechanism of this character which will operate even though the operator should pay no attention atall to the hoist after he has once started it.

A further object is to provide means adapted to be controlled by the operator whereby he is enabled to bring the cages to the landing easily and without loss of time.

Another object is to provide means whereby when men are to loe-hoisted from a shaft bottom the mechanism can be so shifted as to prevent accidents by insuring proper landing of the cages.

A still further object is to provide means whereby when the cages are used for hoisting men, they can be caused to travel at a reduced speed.

`With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter dcscribed and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of the invention shown can be made without departin from the spirit of the invention.

In t e accompanying drawings the preferred form of the invention has been shown.l

In said drawings Figure l is a side elevation of a portion of the mechanism consitituting the present invention, apart of the hoist being indicated by dotted lines. i

Figure 2 .is a side elevation of the remaining portion of the mechanism.

Figure 3 is a side elevation of the mechanism showing the parts adjusted to the position assumed when men are to be hoisted, the signal mechanism being illustrated in diagram.

Figure 4- is a view partly inside elevation and partly in sectionof a portion of the mechanism. j

Figure 5 is a plan view thereof.

Figure 6 is a section on line 6-6, Figure t.

Figure 7 is a section on line Z-J, Figure 3 showing, in plan, the reduced speed mechanism.

Figure 8 is an enlarged section on line 8-8, Figure 3. v

Figure 9 is a detail view of one of the tripping cams.

Referring to the figures by characters of reference l designates the drum of the hoist driven by a suitable collar element in the form of a `motor M which transmits motion through gears G to the drum, these gears constituting the driving mechanism. The drum is adapted to transmit motion through a train of gears 2 to a transverse shaft 3 having a. gear 4: which meshes with a gear 5 on one end of a longitudinal shaft 6. This shaft is journaled inv bearings 7 and is provided with a longitudinal keyway 8 whereby a worm 9 is connected to the shaft so as to` rotate therewith but slide thereon. This worm meshes with4 a rack bar l() which is slidable between guide rails ll, there being a yoke l2 slidable on the rails and straddling the worm 9 so that when the yoke is shifted along the rails the worm 9 will be moved therewith along the shaft 6, and, at the same time, the rack 10 will be moved with the worm. When the yoke 12 is stationary, however, and the shaft 6 is rotated the worm 9 will impart right line movement to the rack 10 as will be obvious.

Secured to one end portion of the rack bar 10 is a cross-head 13 having parallel rods 14 extending therefrom and slidable upon spaced chairs 15. Each of these rods 14 is slotted longitudinally as indicated at 16 in Figure 9 and has a. tripping cam 17 adjustably connected to it by means of a screw 13 or in any other manner desired.

Journaled within ears 19 upstanding from the chairs 15 are pins 2O on which are mounted bell crank levers each including a stop arm 21 and a tripping arm 22. The stop arm is extended upwardly while the tripping arm is extended along lines substantially parallel with the rod 14 and carries a roller 23 at its free end which bears on the rod. The arms 22 of the two bell cranks are extended away from each other and the upstanding stop arms 21 have their upper ends extended toward each other as shown at 24 and terminating in heads 25. One pair of these stop arms 21 is provided for the brake control lever 26 of the hoist mechanism and another pair is provided for the engine control lever 27 of the hoist mechanism, it being understood that these levers which are fulcrumed on shaft 28', extend downwardly, one of them between the heads 25 on one pair of arms 21 while the other is between the heads 25 onthe other pair of arms. Two cams 17 are provided on each rod 14, one of these cams being initially positioned between the rollers 23 while the other is initially positioned between the cross-head 13 and said rollers. `This position of the cams has been indicated in Fig ure 1.

Extending laterally from the lower" ends ofthe levers 26 and 27 are eyes 28 through which are loosely extended parallel rods 29 attached to the rack bar 10. Each eye 28 is positioned between and spaced from a pair of collars 30 secured upon the rod in said eye and mounted on the rod between the collars 30 and the eye 28 are cushioning springs 31 and 32.

Pivotally connected to the yoke 12 is a bar 32 attached to one end of a lever 33 the other arm of which is connected by a rod 34 to one end of a hand lever 35 which is normally held fixedly in its centen position by means of a heavy pawl 36 fitting into a quadrant 37 so as to hold the lever as indicated in Figure 1.

A hanger 38 provides a bearing for the fulcrumed shaft 28 on which the levers are mounted and straddling this hanger is the from the shaft 41.

forked arm 39 of a lever 40 whiclr is secured to and supported by a cross-shaft 41. A pair of ears 42 is extended laterally from each member of the forked end 39 and mounted in each of these ears is a set screw 43, the screws being adjustable toward or from each other. The levers 26 and 27 are provided on their inner sides with inwardly projecting lugs 44 and when the forked arm of the lever 40 is raised these lugs will be positioned between the screws 43 so that the movement of the levers 26 and 27 will thus be limited by the screws. When the forked arm 39 is in its lowermost position, as indicated in Figure 1, however,` there will be no limitation of the movement of the leversY by the screws because the screws will be located below the paths of the lugs 44. The lever 40 can be actuated to raise the forked arm 39 by pushing through a rod 45 upon one arm of a bell crank lever 46, the other arm of this lever overhanging and being adapted to bear upon the lever so as to actuate it. The shifting of the lever 40 can be effected also by means of the lever 35. This lever has a link 47 connected to it and ex tending to the lower arm 43 of a bell crank lever. vThe upper arm of the bell crank lever is forked as indicated. at 49 and normally straddles a nose 50 extending from an arm 51 which is secured to and depends Thus it will be seen that when the lever 35 is swung either to the right or to the left from its central position it will operate the bell crank lever so as to cause one or the other members of the forked arm 49 to press against the nose 50 and swing the arm 51, thereby to raise the forked arm 39 of lever 40 and bring the screws 43 to raised or limiting positions.

With the parts in their normal positions as illustrated in` Figures 1 and 2 the brake is released and the engine is operated so as to drive the hoist at full speed as when hoisting coal or the like. As the drum rotates motion will be transmitted therefrom to the shaft 7 as heretofore explained so that the worm 9 will slowly move the rack 10 longitudinally and set up a corresponding movement of the rods 14 and 29. Thetripping cams 17 areso positioned that as the cage arrives 'at the point where the slowing down should begin, one of the tripping cams 17 will move under the wheel or roller 23 in the path thereof and move upwardly thereby causing the arm 21 controlled by said roller to press against the lever and swing said lever back to its central position. As both the levers 26 and 27 will thus be operated the power will be gradually cut off and the brakes gradually applied, the timing of the parts being such as to bring the cage accurately to the proper stopping place. Obviously the mechanism will operate the same whether the cage is being raised or lowered, one of the tripping cams 17 operating to bring the cage to a gradual stop at its upper landing and the other tripping cam operating to bring the cage to a gradual sto at its lower landing.

hould the operator receive a signal from the bottom of the shaft that men are to be hoisted in the cage, he promptly throws the lever 35 in the direct-ion in which he intends to move the levers 26 and 2T. 1f desired this movement of the lever can complete an electric circuit to a lamp located at the bottom of the shaft. Such lamp will be a signal to the eager that the mechanism is set to hoist men. As shown in diagram in F igure 3 this signal mechanism can include push buttons 52 or other suitable switches located at the two limits of movement of the lever 35. Each of these buttons or switches is adapted to close a circuit to a lamp indicated at 53. Thus when the lever is pushed against one button it will close the circuit to one lamp and when pushed against the other button it will close the circuit to the other lamp. Vhen lever 35 is shifted in this manner away from its central or normal position it operates the forked arm e9 of the bell crank lever so as to swing the lever 40 and elevate the stop screws 113 into the paths'of the ears 4K1. Thus when the levers 26 and 27 are shifted they cannot be moved the full distance but can only be moved far enough to set up a speed at which men can be hoisted with safety. This same operation of the lever 35 will actuate the lever 33 and cause it to pull or push through the bar 32 upon the yoke 12. Said yoke will thus slide the worm 9 along Lits shaft 6 and at the same time slide the rack bar 10 so as to move the tripping cam 17 closer to the wheel 23 to be actuated thereby. Accordingly when the levers 26 and 27 are shifted their movement will not only be limited in the manner hereinbefore pointed out but their lower end portions will be brought to positions where they will be actuated sooner by the arms 21 and brought baclr to their normal positions, because the tripping cams 17 will engage the rollers 23 at the proper time before the cage reaches the landing stage and insure the cage stopping gradually and safely at the proper level. 1f the operator wants to reduce the speed without shifting the lever 35 he can do so by means of the rod 45 as heretofore explained. l

By providing the springs 31 they will just touch the lower ends of the levers when said levers are brought to their central or intermediate positions after the hoist has reached its limit of its movement in either direction, these springs allowing the operator to move the levers slightly so as to cause the cages to move into their landing if brought to a stop slightly therebelow. This arrangement of springs does not constitute in itself any partof the present kinvention but has already been disclosed in other patents issued to me among which may be mentioned No. 1,216,143 of February 13, 1917 and 1,358,378 of Novem ber 9, 1920.

The lever 5a indicated by broken lines in Figure 1 does not constitute a part of the present invention but is merely a brake tightening lever such as covered by Patent No. 1,358,379, issued to me on November 9, 1920.

What is claimed is:

1. In hoisting mechanism the combination with engine and brake control levers and a hoisting drum, of stop devices extending into the paths of the levers, slide rods, means operated by the drum for imparting longitudinal movement to the rods, and cooperating means upon the rods and the stop devices for shifting said devices to engage'and move the levers back to hoist stopping positions.

. 2. In hoisting mechanism the combination with a drum and engine and brake controlling levers, of tiltable stopdevices at opposite sides of each of the levers, slidable means for actuating the stop devices to shift the levers totheir hoist stopping positions, and means for transmitting motion from the drum to said sliding means.

3. In hoisting mechanism the combination With a drum and engine and brake controlling levers, of opposed stop arms movably mounted and arranged in pairs, one of said levers being extended between the arms of one pair and the other lever between the arms of the other pair, slidable means movable in either direction for actuating the arms to engage and move the levers to hoist stopping position, and means for imparting longitudinal movement to said sliding means from the drum.

11. 1n hoisting mechanism the combination With a. drum and engine and brake controlling levers, of slidable rods, means for transmitting motion thereto from the drum, stop devices arranged in pairs and at opposite sides of the respective levers, and cooperating means upon the stop devices and said slidable rods for actuating the stop devices after a predetermined movement of the slidable rods in either direction, thereby to restore the levers to their hoist stopping position.

5. In hoisting mechanism the combination with a drum and engine and brake controlling levers, of movable means, means for transmitting motion thereto from the drum, stop devices arranged in pairs and at opposite sides of the respective levers, and oooperating means upon the stop devices and said movable means for actuating the stop devices after a predetermined movement of the movable means in either direction, thereby to restore the levers to their hoist stopping position, and means for bodily shifting the movable means to advance the actuation of the stop devices.

6. In hoisting mechanism the combination with adrum and hoist controllingl levers, of a shaft actuated by the drum, a worm feathered `on the shaft, a rack bar engaged and actuated by the worm, rods movable with the bar, tripping cams carried by each of the rods, stop arms arranged in pairs, each of the levers projecting between two of the arms, and means actuated by the tripping cams for shifting the stop arms to move the levers to their hoist stopping positions, and means for shifting the `worm along its shaft to slide the rack and advance the actuation of the stop arms by the cams.

7. In hoisting mechanism the combination with a drum, and hoist controlling levers, of a shaft actuated by the drum, a Worm on the shaft, a rack bar engaged and actuated by the worm, rods movable with the bar, tripping cams carried by each of the rods, stop arms arranged in pairs, each of the levers projecting between two of the arms, and means actuated by the tripping cams for shift-ing the stop arms to move the levers to their stopping positions. y

8. In hoisting mechanism the combination with a drum and hoist controlling levers, of pairs of opposed stop arms pivotally mounted, one of said pairs being `provided for each lever, rods slidably mounted adjacent the arms, actuating cams upon the rods, means upon the stop arms and cooperating with said cams for shifting the stop arms after a predetermined movement of the rods to move the levers to their vhoist stopping position, and means operated by the drum for actuating the rods.

9. In hoisting mechanism the combination with a drum and hoist controlling levers, of a shaft, a worm feathered thereon, a yoke straddling the worm and slidable' along the shaft, a rack engaged and actuated by the worm, rods connected to and movable with the rack, tripping cams connected to the rods, stop arms arranged in pairs, one pair being provided for each lever, the arms of each pair being at opposite sides ofthe lever, and means connected to the arms and actuated by the cams for shifting the arms at predetermined points during the movement of the rods to swing the levers to their hoist stopping position, and `means under the control of the operator for shifting the yoke and worm to slide the `raclr and ad' vance or retard the actuation of the stop arms by the tripping camsa j 10. n hoisting mechanism the combination with a drum, of opposed stop devices movably mounted, a controlling lever proj ecting therebetween, a slidable rod, tripping cams upon the rod for actuating the stop devices to move the lever to its hoist stopping position, means for transmitting mo- 'tion to the rod from the drum, a projection on the lever, adjustable speed limiting means shiftable into and out of the path of the projection on the lever, a second lever, and separate means 'operated thereby for simultaneously shifting the rod bodily to advance or delay the actuation of thestop devices by of the projection, a second lever, means op-` i `erating by the movement of said second lever in either direction for raisingthe stops into the path of the projection.I

l2. In hoisting` mechanism the combination with a drum and hoist controlling levers, of means operated by the drum for restoring the levers automatically to their hoist stopping positions during the final rotations of the drum at each operation of the hoist, and means shiftable by the operator during the movement of the hoist for advancing the actuation of the levers by the hoist.

13. In hoisting mechanism the combination with a drum and` hoist controlling levers, of means operated by the drum for restoring the levers automatically to their hoist stopping positions during the final rotations of the drum at each operation of the hoist, .and means shiftable by the operator during the movement of the hoist, for advancing the actuation of the levers by the hoist, and for limiting the actuation ofthe brake and engine controlling levers to brake release and engine operating positions.

le. In a hoisting mechanism for raising alternate loads, a drum, a driving mechanism,l a power element, automatic means for slowing down and stopping said power element, whenA the loads have reached their regular terminals, and manually operated meansifor shifting said power element control means to automatically slow down and stop either load when it has reached any predetermined terminal at a point earlier than its regular stop. c

l5. In avhoist mechanism for raising alternate material loads to a certain fixed terminal and for hoisting men from certain xed points to' a regular terminal at a point lower than that to which materials are hoisted, a drum, a driving mechanism, a powerelement, means for the manual application of power to the power element to start the hoist, power control means, manual means for shifting the power control means to automatically slow down and stop the power element to land men at their predetermined terminal, and means actuated by llO said shifting movement for automatically displaying a suitable signal at the point from which men are to be hoisted to prove to them that the slow down and stop means is properly set to stop the said power element at the right point, before they signal the operator to start the hoist.

16. A hoist mechanism for handling men and materials between certain fixed points, including a drum, a driving mechanism, a power element7 manual means for starting the power element, automatic means for slowing down and stopping said power element at various points, automatic means for limiting the speed of the power element to any predetermined value, when the power elementI control means is shifted manually 'for automatically slowing down and stopping the hoist when handling men.

17. In hoisting mechanism the combination with a hoist control lever and a hoisting drum, of stop devices extending into the In testimony that I claim the foregoing as my own, I have hereto aiiixed my signature in the presence of two witnesses.

DANIEL I". LEPLEY.

litnesses:

W. H. SorssoN, BARNETT C. BURKHARDT.

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