US1614372A - Overwind control for hoists - Google Patents

Description

Jan. 11 1927.

D. F. LEPLEY OVERWIND CONTROL FOR HOISTS 3 Sheets-Sheet 1 Filed Oct. 22. 1924 61H01 1 w 14A.

Jan. 11 1927.

OVRWIND CONTROL FOR HOISTS Filed Oct. 22. 1924 3 Sheets-Sheet 2 GHSOI new Jan. 11 1927.

OVRWIND CONTROL FOR HOISTS Filed oct. 224 1924 3 Sheets-Sheet 5 any: new

Patented Jan. 11, 1927.

UNITED STATES 1,614,372 PATENT OFFICE.

DANIEL F. LEPLEY, OF CONNELLSVILLE, PENNSYLVANIA; PAUL V. -LEPLEY, EXECU- TOR F SAD DANIEL F. LEPLEY, DECEASED, ASSIGNOR TO CONNELLSVILLE MANU'- FACTURING AND MINE SUPPLY CO., 0F CGNNELLSVILLE, PENNSYLVANIA, A COR- PORATION.

OVERWIND CONTROL FOR HOISTVS.

Application filed October 22, 1924. Serial No. 745,197.

This invention relates to a hoisting mechanism tor use in operating mine skips and cages, the samebeing of that general type disclosed for example in Patents-1,419,144- and 1,419,154 issued to me on June 13, 1922; 1,358,378 granted to me on November 9, 1922; 1,294,124 issued to me on FebruaryI 11, 1919; 1,216,143 issued to me on February 13, 1917, and other patents of a like nature held by me.

One of the objects of the invention is to provide an automatic stop intended vprimarily for use where hoists are run at reasonably slow speeds, the mechanism being more simple and less expensive than those required onV high speed hoists but being at the same time both safe and reliable.

Another object is to improve'upon the patented mechanisms by providing means whereby overwinding is prevented automatically, suitable means being employed for shifting the controller and applying the brake when the skip or cage 'reaches a predetermined point in its travels provided the hoist engineer has failed to operate the controlling lever.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combina-tion and arrangement ot parts and in the details of construction hereinafter described and claimed, it boing. understood that changes in the precise embodiment ot the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form ot the invention has been shown.

In said drawings- Figure 1 is a side elevation of the hoist mechanism having the present improvements combined therewith, some of the parts being broken away.

.Fig 2 is a plan view of the mechanism.V

shown in Fig. 1.

Fig. 3 is an enlarged side elevation of that portion of ythe mechanism constituting the present invention.

Fig. 4 is a side elevation on `an enlarged scaleof the controlling latch, a portionof the forked lever cooperating therewith being shown in section. v

Fig. 5 is aV plan view of the structure shown in Fig. 4.

ott the current to the motor 5 or other operating engine and to apply the brake to the hoist drum. The mechanism disclosed utilizes a brake drum G of the type usually employed in mechanisms of this character and which drum has shoes 7 cooperating therewith and adapted to be actuated by a rod 9 .on one arm of a bell crank 10. This bell crank, in turn, is connected by a rod 11 to mechanism actuated by the weighted lever 4 so that when said lever drops the brake shoes will be applied and the winding drum brought to a stop'.

A standard 12 is suitably located and has a rod 13 slidable therein and connected to the lever 4. This rod is normally engaged by a weighted latch 14 pivot-ally mounted in the standard and designed normally to support the rod 13 and the lever 4 against vgravitation.

A centrifugal governor 15` is operatively connected to the shaft 16 of the Amotor and brake drum, any suitable mechanism such as if a chain and sprockets indicated generally at 17 and 18 respectively being utilized for this purpose. Suitable gearing indicated generally at 19 is utilized for transmitting motion from the motor shaft to the winding drum. A rack 2O is adapted to be driven by the hoist mechanism so as to travel slowly in a longitudinal direction 'for the purpose of holding the controller and brake levers againstmov'ement in the wrong direction..

The parts heretofore described do not in themselves constitute any part of the present inventionbut have already been clearly described and claimed in my patents heretofore mentioned. In the machine thus far described and as covered by my patents mentioned, the actuation of the winding drumwill cause a gradual movement of the rack 2O and a'continuous operation of the governor 15.

The part-of the 4mechanism' constituting the present invention includes a rod 21 having a slotted end 22 slidably engaging the latch lever 14 `and connected at one end to a lever 23. The other end of this lever is pivotally connected to a rod 24, th-e lower end of which is attached to one arm of a bell crank 25. YThe other arm of the bell crank carries a roller 28. A spring 27 constitutes a resilient support for one arm of the bell crank 25 as shown in Fig. 3 and serves to press roll-er 26 normally against the periphery of a drum 28. `This drum is carried by a screw threaded shaft 29 which engages a fixed bearing 30. A gear 31 is feathered on the shaft and is adapted to receive motion from a. gear 32 secured to a shaft 33 which, Vin turn, is driven by a chain and sprocket mechanism 34 from a shaft 35. This shaft is connected-by the gearing 19 to shaft 1G and has chain and sprocket mechanism 3G for operating indicator mechanism 37. It might be stated that, the indicator mechanism constitutes no part of the present invention and need not, therefore, be specifically shown or described.

The gearing 19 and the chain and sprocket mechanism 34 as well as the gears 3l and 32 are adapted to greatly reduce the speed of rotation of shaft 29 and indicator `37 so that as the hoist operates and the skip or cage moves upwardly or downwardly, the drum 28 and its shaft 29 will be fed transversely very slowly.

Another bell crank 38 is connected to one end of a rod 39 the upper end of which has a head 40 provided with laterally extending lugs 41. These lugs are located adjacent the center of the head and one edge of the head normally projects into the forked end 42 of a lever 43. The other end of the lever is connected to the rod 21. Lever 38 carries a roller 44 which is held normally pressed against the periphery of the` drum 28 by a spring 45 corresponding with the spring 37.

A rod 46 connects head 40 to one end of a bell crank 47 and the other end of this bell c 'ank is operatively connected as at 48 to a longitudinally shiftable rod 49 controlled by governor 15.

The .drum 28 has a tripping cam 50 upon its periphery and this cam is adapted to successively come against. and shift-.the rollers 44 `and 26.

It. is well known to those skilled in this art that if the hoist mechanism is travelling at-excessive speed when the cage or skip approaches its landing, the automatic application of the brake and the shutting olf of the current will not stop the mechanism quick enough to prevent ov-erwinding. Thus it is necessary for the hoist engineer-tobe constant-ly alert to avoid this trouble. Failing in this, .the mechanism will overwind with possible wrecking of a portion of the apparatus or at least the necessity of returning the cage or skip to its proper landing point. Mechanism constituting this invention requires the operator to shut off the controller and apply his brake manually to slow down the hoisty before the cage reaches a point about fifteen feet from the landing. Otherwise the mechanism will act automatically.

During the movement of the hoist skip or cage, the drum 28 will be shifted axially by its threaded shaft 29 and when the cage or skip reaches a point about fifteen feet from its landing, the cam projection 50 will come against and shift the roller 44 so as to cause bell crank 38 to pull downwardly on head 40. If the operator has already slowed down the hoist, the lugs 41 will be so spaced o from lever 43 that during the downward movementl of head 40, said lever will not be actuated. If, however, the speed has not been reduc-ed just prior to reaching the landing stage, and the hoist mechanism is traveling at excessive speed, the governor 15 will pull on rod 49 and cause bell crank 47 to thrust head 40 farther into the forked end 42 of the lever 43. Therefore, when the cam projection comes Vagainst roller 44 and pulls head 40 downwardly, the lugs 41 will engage and depress the forked end of lever 43 with the result that rod 21 will be thrust upwardly and the latch 14 shifted to release weighted lever 4. Consequently the cage or skip will be brought to a stop bcfore .reaching the landing and it then bccomes necessary for the engineer to shift the levers 1, 2 and 3 to bring the cage to the proper level. It might be stated that when the governor is operating at excessive speed it strikes a metal plate 51 adjacent thereto so as to sound an alarm and attract attention of the hoist engineer. This plate is connected to a shaft 52 provided with a crank arm 53 to which is attached a rod 54. This rod is connected to the fulcrum of lever 23 and adapted to swing with said lever. Thus the actuation of the alarm and consequent rotation. of shaft 52 will result in a pull upon the arm 55 and a consequent actuation of lever a3 for the purpose of stopping the hoist mechanism should it overspeed while the cam projection 50 is remote from roller Y By providing the lever 25 with its roller 26 the trip will be quickly released automatically in case of overwind and the controller will be shut oft' and the bralfzes applied.

What is claimed is 1. The combination with hoist mechanism, mechanism for stopping the same, and a latch for holding said mechanism normally inactive, of ,an axial-ly movable rotatable tripping element, separate members for successiveactuation by said element, a coupling member operatively connected to one of said members, an operative connection between the other member and the latch, and speed lil) controlled means for shifting the coupling member into and out of operative relation with the latch.

2. The combination with hoist mechanism, mechanism for stopping the same, and a latch for holding the stopping mechanism inactive, of a movable tripping element actuated by the hoist mechanism, separate members for successive actuation by said element, a coupling member connected to one of said members, an operative connection between the othermember and the latch for shifting the latch to released position when said member is shifted by the tripping element, and means operated by the excessive speed of the hoist mechanism for shifting the coupling member into operative connection with the trip to move it to position to release the stop mechanism.

3. The combination with hoist mechanism,

stop mechanism therefor, and a latch for, holding the stop mechanism inactive, of a forked lever operatively connected to the latch, a tripping element movably mounted and driven by the hoist mechanism, separate members for successive actuation by the tripping element, an operative connection V between one of said members and the latch, a coupling head operatively connected to the other member, a governor actuated by the hoist mechanism, and means controlled by the governor for shifting the coupling head into engagement with the forked lever tocouple it to one of the trip actuated members.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature.

DANIEL F. LEPLEY.

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