US1352632A - Automatic traction-hoist - Google Patents

Description

c. P. ROSS.

AUTOMATIC TRACTION HOIST.

APPLICATION FILED JULY 24. 1919.

1,352,632. Patented Sept. 14,1920." F2, 2 2 SHEETS-SHEET x. B2 j v C2 .HH HIIIHHI I rm Inveniar.

C. P. ROSS.

AUTOMATIC TRACTION HOIST.

APPLICATION FILED JULY 24, 1919.

te p 14, 1920.

. I F 2 SHEETSSHEET 2- 12.4; g

Wrze fi, I (:Z 653' j. 220,55.

PAT NT, If

:CL'YDE 1?. Ross, on nmrwo n, rumors, Ass lenon wo mnnm assuring COMPANY, ECHIC AGO,EELLINOISpA' oonrona'rronorj, ILLINOIS. j

AUTOMATIC"TRACTION-H0151:

Be it known that I, CLYDE P. Boss, acitizen of United States, residing at Kenilworth, in the county -of,Cook and State of Illinois, have invented a certain new iand useful Improvement in AutomatioElectric Traction-Hoists, of which the followingris a specification.

My invention relates to an improvement in automatic traction, coal hoists and has for a general object the prevention of overwindv ing ofsuch hoists when the carriage reaches its limit. This object I obtain bytheapplication to a coal handling plant, of a drum operating on thetraction principle, passing the hoisting cable under the hoisting drum,

, and maintaining this tractionon the-drum I hoist.

by means of a counterweight or second carriage attached to the end of the cable; 1 When the counterweight grounds, the-cable slacks the traction is reduced, the; cable slides on the hoistin drum and the; carriage ceases to, move. 1 other object is the provision of a removable tire for the'hoising drum, which may be easily removed when worn out without removing the cable ordismantling the Other objects .will appear from time to time in the specification. f Y

I illustrate my. invention diagrammatis cally in the following drawings wherein: Figure 1 is a side elevation of my hoist gi Fig. 2 is a plan viewof my hoist 1 1. Fig. 3 is a detail-of the hoisting, drum on an enlarged scale; o a i Fig. 4: is a section on lines 4.-4 of Fig. 3; Likeparts arerepresented by like charactersin all the figures. r ,A is an integral base plate on whichj-the hoisting machine is mounted. It carries Se.- cured to it the connected supporting frames A A and adjacent them, se'curedto the base, the motor B. The motor drives, the

motor shaft BPwhichcarries keyed to it? the pinion 13. Mountedonthe frame A .is the shaft C supported in the, bearings C C It has keyed to it the gear C in mefsh with the pinion B Intermediate the ends of the shaft, is keyed the pinion O Mounted on the frame A is a shaft D which-rotates in the bearings D D Keyed to'it is the gear D in mesh with the pinion C Keyed to the same shaft is the hoistingdrurn ET. This Specification of letters l 'atent. LP-

I tentedfseptyia,1920. 1919. Serla1No, 3 12,97 9

drum-is provided with a removable tire preferably although not necessarily, constructed in two sections E E The periphcry of the, tireis surrounded by al plurality of deepzv-shaped grooves E The removabletire sections adjacent their 'meeting point: one withnanother have laterally and inwardly extending lugs E, engaging, each pair betweenithem, the lugs E onthe web of the hoisting drumf These l ugs' are all perforatedto receive a bolt E which: passes through eachrpair of lugs on the" removable l rim-and the lug 0n the. drum \veb which :lies between them.' The bolts and'nutsiE when locked in place firmly lioldthe assemwbly ,to ether. The .lugsE .being offset to ward t evcenterof rotationof=the"drum,are adapted to prevent displacement of the tire sections on the drum. The cable F, one end ofwhich is attached to the hoistingv carriage andqthe other to the counterweight orto a second carriage, passes over pulleys-not shown, and is looped around the l hoisting drumengagin -it abo'utthe lower halfof its periphery. y-hoisting drum'isto used with an; automatic controller which determines the lengthof excu'rsionof theeable;

.Itwill, of course, be understood that this showing'is largely diagrammatic and that while an operative" device has been illus tratedyrnany variations in shape, disposition of parts and'in setting up of the systemfcould be made Without departing from the-spirit of j-my invention, and for :this reason I wish my drawings to be taken as largely diagrama The use and operationof my invention are as follows Myihoisting drum is driven in any suitable way from drivingmeansxadjacent there'- to. It is the usual practice inhoisting drums forheavy work such as in coaling plants for raising, lowering, or storing coal, to wind the cableabout the drum and secure one end ofit tothe drum. 1 There 'ar'efmany "disadvantages to this method including the risk of overwinding, if'thetiming and limiting device, :automatic or otherwise, fail to funcmethod, regardless of any control, automatic or manual, of the hoisting means, by applying to a heavy coal hoist the traction systerm. The hoisting cable is carried about the hoisting drum and engages it on only half of its periphery. Obviously, the hoisting drum may be placed at the top or at the bottom of the hoisting excursion, or anywhere else, depending on the arrangement of a cable and the needs of the particular installation. In any case, the cable will normally engage the hoisting drum about half or less of its periphery, and in the figures herein shown, the form wherein the cable engages the drum about the lower half of its periphery is illustrated.

When the hoisting carriage and the counterweight or second carriage are both hanging free, the tension on the cable is sufficient to compress it within the V-shaped slot and hold it against the drum with 'sufiicient power to prevent its moving with relation to the periphery of the drum. When the drum is revolved the cable moves with it. When the counterweight or the carriage grounds, however, the tension on the cable is reduced and the whole cable is slacked. This so reduces the tension between the cable and the drum that the cable slides with relation to the drum and the drum is no longer able to hoist. Thus, no matter whether or not the rotation of the drum continues, the traction has ceased and the carriage remains stationary. Any possibility of overwinding is thus absolutely prevented. It is hardly necessary to emphasize the importance of such a provision for a coaling hoist where the weights handled are great and the damage which can be done by overwinding is enormous. To remove the rim of the drum of this hoist, all that is necessary is to rotate the drum to allow one of the segments to occupy that upper part of its periphery which is not engaged by the cable, then the operator removes the holding bolts and lifts the upper segment off and replacesit with a new one. Then the drum is rotated and the same process repeated with the other segment or segments. This prevents the necessity of unshipping the cable a complicated, long and expensive operation. It prevents the necessity of any dismounting of the machinery, and permits the whole operation to be performed with sim licity and despatch. When the drum surihce wears out, the tire can thus be quickly and easily replaced by an unworn set of segments.

It will be understood that in a device such as this under constant heavy duty the need of easily removable segments is great because they frequently wear out when as here the traction system is used and in fact it would probably be commercially impossible to use the traction typev of hoist without some such provision for readily renewing the drum face.

I claim 1. In a hoisting drum, a radially thin removable hoisting drum rim comprising a plurality of engaging rim sections and means for separately removing them.

2. In a hoisting drum, a radially thin removable drum rim-comprising a plurality of radially thin removable rim sections, said sections adapted to be removably secured to cent their engagement with each other or securing them at the same time to each other and to the drum, comprising lugs on the opposed ends of the tire segments in line with each other and lugs on the drum rim in line with and between said tire lugs, together with securing means for securing together each such set of lugs.

5. In a hoisting drum adaptedfor use with a hoisting cable, a removable rim and means for removing and replacing it without dismounting the cable from the drum.

6. In a hoisting drum adapted for use with a hoisting cable engaging the drum only about part of its periphery, a removable rim comprising a plurality of removable segments, each'of said segments adapted to be removed and replaced in turn during the engagement by the belt of the other segments.

In a hoisting drum, adapted for use with a hoisting cable engaging the drum substantially about the lower half of its periphery, a removable rim adapted to be removed without the dismounting of the cable from the drum, said rim comprising a plurality of removable segments each in turn adapted tobe removedand replaced while lying on the upper periphery of the drum, the other segments being supported in place on the drum by the tension of the hoisting cable.

8. In a hoist adapted for the handling of heavy weights, a hoisting drum and means for driving it, a hoisting cable frictionally driven thereby and a radially thin removable drum rim comprising a plurality of removable rim sections.

9. In a hoist adapted for the handling of A In testimony whereof, I afiix my signature heavy weights, a hoisting drum and means in the Fresence of two witnesses this 21st 1 for driving it, a cable frictionally driven day of uly 1919. thereby and a removable drum rim adapted CLYDE P. ROSS.

5 to be removed from the drum and replaced Witnesses:

without interrupting the frictional engage- AGNES G. JOHNSON,

ment of the cable with the drum. EDITH L. PORTER.

Images