US1687278A - Overturning skip apparatus - Google Patents

Description

Oct. 9, 1928. 1,687,278

A. ALLEN OVERTURNING SKIP APPARATUS Filed D60- 21, 1926 3 Sheet-Sheet 1 Oct. 9, 1928.

A. ALLEN OVERTURNING SKIP APPARATUS 3 Sheets-Shet l nlfenr r AndrewSA/h: n'

it orwg Oct'. 9, 1928.

A. ALLEN OVERTURNING SKIP APPARATUS 3 Sheets-Si jet 3 Filed Dec. 21, 1926 Patented Oct. 9, 1928.

UNITED STATES PATENT OFFICE ANDREWS ALLEN, OF GLENCOE, ILLINOIS, ASSIGNOR IO ALLEN 8c GARCIA COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

OVERTUBNING SKIP APPARATUS.

Application filed December 21, 1926. Serial No: 156,163.

My invention relates to mining and has particular reference to the construction and operation of overturning skips for use in mining operations, the overturning of the skips being carried out in the tipples.

An object of my invention is to provide a skip hoist so arranged and operated that the skip will always be returned to the mine shaft in upright position.

Another object of the invention is to provide means whereby a skip may be emptied nearer the chute than is possible under present constructions.

A further object of the invention is to improve skip hoist discharge apparatus whereby the head room overthe chute in the tipple may be materially reduced.

Another object of the invention is to arrange a skip hoist wherein a considerable portion of the weight of the skip with its lading is sustained by the hoisting cable and removed from the skip guides during discharge.

A still further object of the invention is to-provide a construction whereby as the skip is hoisted, all lateral strains are transferred from the guide-ways in the shaft for the cross-head to guide-Ways for overturning the ski A still further object of the invention is to provide means permitting over-wind of the hoisting cable Without upsetting the skip.

A still further object of the invention is to provide a plurality of guide-ways adapted for successive engagement in the direction of travel of the skip, and means on the crosshcad and skip body for engaging said guideways.

Another object of the invention is the provision of discharge apparatus which operates smoothly and without shock to the mechan ism and to the hoisting skip, and in which the lading is allowed to slide out of the skip onto a discharge chute instead of being dumped into the chute from a-considerable height, as has been common practice heretofore, result ing in less breakage of the ladingand in less wear to the discharge apparatus, chute and the like.

Another and further object of the inven tion is the provision of discharge apparatus in which the discharge cycle .is materially lessened, that is, the distance through which the skip is hoisted during the emptying thereof is shortened, and at the same time the skip is overturned sufficiently to allow moved outwardly away from the mine shaft 7 during an intermediate stage of the discharge cycle and tilted about the lip as a fulcrum, whereby the lading is moved toward the discharge portion of the skip, the operation being similar to the emptying of an ordinary coal scuttle at the door of a stove.

Another and yet further object of the invention is the provision of discharge appa ratus which will not be damaged in case of overwind of a hoisting mechanism and which sustains and holds the hoisting skip during the overwind operation and rights the skip in a proper manner after the discharge operation has been completed, thereby preventing the skip from returning to the mine sha upside down.

The above recited and other objects will be apparent from the following description and drawings and will be particularly pointed out in the appended claims.

Generally speaking I carry out the preferred embodiment of my invention by providing, in a mine shaft on each side thereof a single guide-way, each of which is engaged by a guide shoe on the ends of the cross-head of the skip hoist and also by guide shoes on the sides of the skip body. These guides are referred to herein as the shaftguides. In the tipple, similar guide-ways are provided for the cross-head, which are parallel to and disposed rearwardly of the shaft guide-ways for engagement by other guide shoes on the cross-head. These other cross-head guides are referred to herein as the cross-head tipple guides. For guiding and overturning the skip in the tipple I provide what I term herein skip tipple guides. These are channel shaped comprlsing separate members, such as angle irons, for the channels. There are two such guides on each side of the tipple for engagement by rollers on the skip as to the mine shaft. These channel guideways are curved in elevation so as to cause the sk1p body to tilt or Overturn as the rollers thereof lll.

en age the proper ti ple guideways and as the? hoisting is continiied. As the skip body is moved into a substantially horizontal position by reason of the engagement of the rollers on the body thereof with the tipple guideways, a projection is engaged by the rear side of the body of the upper end of the skip in its overturned position which position is reached to completely ischarge the contents thereof, which projection serves as i a fulcrum in case of overwind ofthe hoisting apparatus, and if the overwind is continued, the skip body slides on this projection permitting certain of the rollers on the body of the skip to en age other portions of the guidewa s set at when the hoisting apparatus is owered, the rear or lower end of the skip body will descend first, thus preventing the'return of the skip body to the mine shaft in upside down or overturned position.

. of certain ofthe tipple guideways showing the skip in two overturned positions, and its relation to certain guideways in these positions.

The position shown in full lines being that in full dumping position, while that shown in dotted lines shows the skip in overwind position after complete discharge of its lading.

Referring to the drawings and in which like reference characters refer to like parts throughout, a hoisting skip body 10 adapted for vertical or substantially vertical movementin a mine shaft is shown. Suitably mounted near the lower end of the skip body 10 is an axle 11 extending across the same, to which are'secured outwardly of the sides of the skip body, the lower ends of a pair of I- bars 12 and 13, which are connected at their upper ends to a cross head 14, to which the usual hoisting cable 15 is fastened in any approved manner. The cross head 14 has guide shoes 16 and 17 at each end thereof near the front of the cross head, which are adapted to engage shaft guides 18 and 19 seoured to the opposite sides of the mine shaft and which extend longitudinally thereof from the bottom to the top of the mine shaft and for a short distance into the tipple. At

tion.

each end of the cross head and near the rear thereof are similar guide shoes 37, 38 which engage other vertical or substantially vertical guides mounted in the tipple, i.- e. the cross-head tipple guides, as will be described more fully hereinafter. The guides 18 and 19 are shown as comprising T-rails, but an suitable design and material may be use s iph as commercial shapes or wood and the The skip body 10 is provided with guide shoes 20, 20 on each of its sides. The guide shoes 20 being above the shoes 20 and in vertical alignment therewith. These shoes 20, 20 are positioned on one side of the vertical center of the skip body, and in alignment with the guide shoes.16 and 17 on the cross-head for engaging the shaft guides 18 and 19 in the mine shaft to prevent overturning of the skip body 10 whileit is being raised or lowered in the mine shaft, thus eliminating all other means ,for performing this func- Mounted on the outer ends of'the axle 11 are rollers 21 and 22 secured to the axle by lock plates or in any other approved manner, and which are adapted to engage a pair of tipple guideways designated as a whole as 23 and 24, after the skip has reached the tipple and just prior to the beginning of the discharge cycle. At the front of the skip body 10 and near the upper end thereof are rollers 25 and'26 mounted on stub axles suitably secured to the skip body 10. These rollersare adapted to engage tipple guideways designated as a whole as 27 and 28, during the discharge operation. Q

The tipple guideways 23, 24 and 27 and 28 are shown in the drawings as channel shaped, which is the preferred arrangement. The contour anddisposition of the guideways '27 and 28 are the same, one of each of these guideways being mounted on each side of the tipple above the upper end of the mine shaft. This is true also of the guideways 23 and 24. Therefore, in describing these guideways reference will be had to guideway 27 of the pair 27 and 28 and the guideway 23 of the pair 23 and 24, mounted on the same side of the tipple. Referring to Fig. 1 of the drawings it will be noted that the guideway 27 is formed by members 29 and 30 which are preferably angle irons. These members 29 and 30 are disposed in spaced relation to each other and arranged so that the space therebetween is uniform from bottom to near the top. At the lower end of this guideway the members 29 and 30 are flared outwardly, as at 29 and 30 to permit the rollers 25 and 26 on the skip body 10 to enter freely. As shown in the drawings this guideway is for a portion of its length substantially vertical, then it curves outwardly as indicated. The upper end of the member 30 of this guideway 27 is bent outwardly on a shorter radius than the portion immediately below it with a short substantially horizontal portion 30 and an upstanding end member 32 which serves as a stop against horizontal movement of the rollers 25, 26 under certain conditions. The upper end of the member 29 forming the guideway 27 is bent inwardly, as shown at 29", and then outwardly at an angle away from the upper end of the member 30 with its upper end portion vertical, the upwardly turned end portion of this member 29 of the guideway 27 being indicated at 31 and the vertical end portion at 31. The length of the vertical portion 31 is determined by the maximum height to which the skip body is raised under maximum overwind of the hoisting cable 15, this portion being long enough to prevent the roller 26 from disengaging with this end portion 31 ofthis part of the guideway 27. A stop 29 may be used to prevent the roller from running out of this guide, if desired.

The guideway 23 is constructed similarly to the guideway 27 by members 35 and 36 which are preferably angle shaped. The

lower ends of these members are flared outwardly, as at 35 and 36 so that the rollers 21, 22 on the axle 11 may readily enter.

As will be noted from Fig. 1 of the drawings, the shaft guide 18 terminates a short distance above the lower end of the tipple guideways 27 and 23. For guiding the cross head 14 in its vertical movement through the tipple cross-head tipple guides 39 and 40 are provided which are parallel to the guides 19 and 20, but disposed to the right or rearwardly of the vertical center of the skip body, as viewed in Fig. 1 of the drawings, guide 39 being shown in this figure. The lower end of this guide 39 is engaged by the rear shoe 37 on the cross head 14 a slight distance below the upper end of the shaft guide 18 so that as the cross head leaves the shaft guide 18 it will be guided in its vertical movement by the'tipple cross-head guide 39 and of course by its corresponding guide 40 on the opposite side of the tipple.

The lower ends of the tipple guides 23 and 27 are so disposed with relation to the upper end of the shaft guide 18 and the tipple guide 39 for the cross head as to bring the rollers 22 and 25 intoengagement with the guide ways 23 and 27 before the lower guide shoe 20 on the skip body has become disengaged from the shaft guide 19. As long as the guide shoes 20 and 20 on the skip body are in engagement with the shaft guides 18 and 19 the skip body cannot tilt or tip out of its vertical position.

The discharge cycle, so called herein, refers to the operation of the skip after the rollers engage the guideways 27 and 23 in the tipple, and after the skip leaves the shaft guides.

The members 35 and 36 forming the guideway 23 reater portion of the len th thereof. Then t lese members are curve outwardly on a extend substantially vertical for a 7 longer radius than the members 29 and 30 of 24, as the skip body is raised to the maximum overwind position of the hoisting mechanism. A stop 23 may be interposed in this guideway 23 to prevent disenga ement of the rollers, if desired. It will be 0 served that by provision of the tipple guideways 23, 24, 27 and 28, the skip body is positively guided throughout its movement after leaving the mine shaft and until it is returned thereto, irrespective of the position of the skip body during the discharge cycle.

The stop 32 in the guideway 27 is so dis-- posed with respect to the guideway 23 that when the roller 25 on the skip body 10 is against this stop 32, the inclined surface 10 of the skip body will be in substantially a horizontal position, A chute 33 is disposed so that the lading within the skip 10 may be discharged thereunto as the skip body is overturned during the discharge cycle. It will be noted from Figs. 1 and 5 that the upper end of the chute 33 may be disposed very near the lip of the skip body 10, thus permitting the lading within the skip body to slide onto the chute 33 and not be dropped thereonto as is necessary in the present type of construction of the skip hoists, where by reason of the present construction, the skip hoist has to be raised a considerable distance above the upper end of the chute in order to overturn the skip body properly to completely discharge the contents thereof. Furthermore I have found with the guideways 27 and 23 arranged in the manner herein described and shown, that as the skip body is turned into substantially horizontal position, a kick is given thereto starting the outflow of the lading in the skip body, as the rollers 25 and 26 hit the stops 32.

Fig. 5 shows in full lines the normal dumping position of the skip body'10 and in dotted lines the maximum overwind position.

For preventing the skip body from going down the shaft in upside down position, I provide, in addition to the guideways 23, 24 and 27' and 28, a stop 34 which is shown in the drawing as being an I-beam. This is suitably secured to the tipple structure and is adapted to extend into the skip body when in dumping position, as shown in Fig. 5. If overwind of the hoisting mechanism occurs the rear end of the skip body is raised until a portion thereof rests on the projection 34,

, whereupon the body slides along this projection as a fulcrum, into the maximum overwind position of the hoisting mechanism, in which position the rollers 25 and 26 are caused to leave the guide members 30 and pass over the gap onto guide members 31 and 31". The dotted line position in Fig. 5 is that of the skip body when in maximum overwind position, as heretofore stated. It will be noted from Fi 5, that the maximum overwind position 0 the skip 10 is but slightly above the dumping position. This makes possible the elimination ofexcessive head room in the tipple, with consequent reduction in the cost thereof.

The 0 eration of the device is as follows:

The s ip hoist including the cross head 14, the sklp body 10 and the I- bars 12 and 13 are raised from the bottom of the mine shaft b a suitable winding mechanism to which the hoisting cable 15 is attached, but which is not shown. During the hoisting of. the skip bod through the mine shaft, the front guide s oes on the cross heads 16 and 17 are in engagement with the shaft guides 18 and 19 in the mine shaft, as are the guide shoes 20 and 20*- on the skip body 10. As the ski ascends into the tipple and enters the disc large cycle the cross head guide shoes 16 and 17 leave the guides 18 and 19 as the shoes 37 and 38 on the cross head engage the cross-head tipple guides 39 and 40. Further raising of the skip frees the guide shoes 20 and 20 on the body thereof from engagement with the shaft guides 18 and 19. However just prior to the disengagement of the shoes 20 and 2O on the skip body from the guides 18 and 19, the rollers 25 and 26 on the upper part of the skip body engage the guides 27 and 28 while the rollers 21 and 22 on the lower part of the skip body engage the guides 23 and 24. Thus at all times the skip body is suitably supported in uideways to prevent or control the tilting of the same. Continued hoisting of the skip body in the tipple will then cause the body to conform to the guideways 23, 24 and 27, 28, resulting in a tilting of the skip body outwardly away from the center line of the mine shaft about the rollers 25 and 26 as a fulcrum, the I- bars 12 and 13 pivoting on their connections with the cross head 14 and the axle 11 on the skip body. As the upper rollers 25 and 26 on the skip body are moved outwardly through the guides 27 and 28 into substantially horizontal position, a kick is given to said body by reason of the abrupt bend in the member 30 of guideways 27 and 28, causing the raising speed of the upper end of the skip body to decrease while permitting that of the lower or rear end to increase. This will cause the lading within the skip body to roll out onto the chute 33. Continued raising of the rear or lower end of the ski body into the full' line position of Fig. 5 W111 qu1ckly discharge the contents thereof. When the skip body is in the substantially horizontal position above described, the upper rollers 25 and 26 will be against the stops 32 on the members 30 of the guideways 27 and 28, seatin in the curve between this portion of the gui eway and the portion 30". The rollers 25 and 26 .then act as a fulcrum for the overturning of the ski body into'the full line position of Fig. 5. f overwind occurs, then the skip body moves rearwardly, the rollers 25 and 26 leave member 30 of the guideways 27 and 28 and engage members 29 thereof and the rear edge of the upper end comes to rest against the stop 34, w ich then becomes a fulcrum as the rear or lower end thereof is raised, as shown in dotted lines in Fig. 5, whereupon the front rollers 25 and 26are raised clear of the member 30 of the guideways 27 and 28 and brought into engagement with the sloping portion 31 of the members 29 of these guideways. Thus at all times the skip body is supported at three points. In the dumping position, shown in full lines in Fig. 5, the skip body is supported on the front rollers 25, 26, the lower or rear rollers 21, 22 with the guides 23, 24 and the I- bars 12 and 13. In

the overwind position the skip body is sup ported on stop 34, the rollers 25 and 26 engaging the inclined portion 31 of the member 29 of the guides 26, 27 and the I- bars 12 and 13. After com lete dumping the cross head is lowered, w ereupon the front rollers 25, 26 being in the dotted line position in Fig. 5, move across the gap on to the portion 30 and against the stop 32 of the member 30 of uideways 27 and 28, about stop 34 as a fu crum. Thereupon the skip body fulcrums about the stop 32 until the lower end thereof is in substantial alignment with these rollers, whereupon the lower end descends into the mine shaft in proper position, with the skip always in upright position ready to receive another load at the bottom of the shaft.

In the overwind position the rollers 25, 26 travel toward the shaft a slight distance and the tilting of the skip is continued until the edge thereof rests on the stop 34 which then takes the weight of the skip. In lowering the skip from its overwind position, the operation is reversed, the skip retracing the path that was followed, the stop 34 performing the function of preventing the rollers 25, 26 descending ahead of the rollers 21 and 22 on the axle 11 of the skip body 10.

If the bottom of the skip were not moved outwardly, as herein contemplated, it is apparent that the motion of the skip would be exactly the same as under present conditions up to the point where the discharge side 1O lies ractically horizontal, at which point the dlscharge of the surcharged lading would be under way. From this point upwardly, the discharge end of the skip would move rearwardly toward the shaft until the final dumping position were reached approximate- 1 45 degrees, at which point the lip of the skip would have retreated fromthe chute 33 a distance approximately equal to the length of the dumping side of the skip. In order to catch the lading as it falls from the skip and to clear the skip as it comes into dumping osition, the discharge point must be lowered and brought nearer to the shaft by a very considerableamount. This is the case in overturning skips previously constructed and the result is that the lading falls a considerable distance onto the chute, which lading thereby sustains breakage and furthermore the skip must be hoisted much higher above the discharge chute. In my construction both of these disadvantages are avoided by the single expedient of having a three point suspension with guides to r surface of the skip away from the shaft during dumping in such a way as to allow the lip of the skip to remain substantially stationary and nearer the chute 33 while the bottom of the skip is being hoisted and outwardly tilted to discharge its lading.

The type of skip body here shown has a discharge side 10" inclined at an angle of approximately 30 degrees with the vertical, which'makes it possible to secure a 45 degree discharge with the rotation of only 105 degrees instead of 135 degrees which would be necessary if the skip were rectangular, thus decreasing the necessary hoisting height aibove the discharge chute because of this act.

While I have described more or less precisely the details of construction of my invention, I do not wish to be understood as limiting myself thereto as I contemplate changes in form and the proportion of parts and the substitution of equivalents as circumstances may suggest or render expedient without departing from the spirit or scope of my invention.

.1 claim:

1. In combination, a hoisting skip, a crosshead, pivotal connections between said crosshead and said skip, shaft guides adapted to be engaged by said cross-head and said skip during the travel of said skip in the shaft, tipple guides adapted to be engaged by said cross-head during the dumping operation of said skip, a plurality of tipple guides for said skip and means on said ski adapted to engage the said skip tipple guides to guide the skip after said skip is freed from engagement with said first mentioned guides, all of said tipple guides for said skip being curved outwardly from the shaft.

2. In combination, a hoisting skip, a crosshead, pivotal connections between said crosshead and said skip, shaft guides adapted to be engaged by said cross-head and said skip as said skip moves through the shaft, tipple uides adapted to be engaged by said cross head during the dumping operation of said ing the ski a plurality of tipple guides for the ski an means on saidskip adapted to engage tlib said skip tipple guides, the said skip tipple guides being curved outwardly from the mine shaft whereby the skip is given an overturning movement about one of said guides during the discharge operation. 3. In combination, a hoisting skip suspension means for said skip, a pair of d guides for said skip, rollers on said skip adapted to engage said dumping guides, a second pair of guides for said skip, other rollers on said skip adapted to engage said second guides, certain of said ides having members extending upwarcfi y to form tracks for said skip when said skip is hoisted above its dumping position, and means artly integral with one of said skip guides or returning said skip to upright position after an overwind. 4. In combination, a hoisting skip, suspension means for said skip, dumping guides for said skip, rollers on said skip ada ted to engage said guides, said guides inclu ing spaced inner and outer members, the said inner members extending upwardly to form tracks for umping ers near the upper end thereof, and other projecting rollers near the lower end thereof, tipple guides for said rollers which have curved port-ions near the upper ends thereof, one set of guides for said upper rollers and another set of guides for said lower rollers,

both of said guides being curved outwardly from the mine shaft and toward a chute, the curvature of said guides being different and so disposed, that when the skip is in substantially horizontal position for discharge, the

distance between said guides is substantially the length of said skip, and one of said guides being formed with an abutment which serves as a fulcrum for said skip as the same is overturned.

6. A skip hoist including a skip body having its front face inclined and diverging from bottom to top, suspension means for said body including a cross head and bails pivoted to the cross head and the lower part of the skip body, guides engageable by members on said skip for directlng the same outwardly of the mine shaft and into such position that said inclined face is in substantially horizontal position, whereupon upward movement of the lip of the skip is an abutment which serves as a fulcrum for said skip as the same is overturned.

7. A ski hoist including in combination with a shaft and a tipple, a skip body, a crosshead, connections between said cross-head and said ski a single guide in the shaft, means on sai ski body and said cross-head for engaging said guide, a tipple guide for the cross-head engageable thereby as said head leaves said first guide, a plurality of channel guides in the tipple, means on said skip for engaging said channel uides, said channel guides both being curve outwardly away from said shaft, one of said guides having a stop which is engaged by said skip on reaching dumping position and which serves as a fulcrum for overturn, said other guides being so curved as to permit overturn of said skip while keeping it against said fulcrum.

8. A skip hoist including in combination with a shaft and a tipple, a skip, a cross-head, means for suspending said ski from said cross-head, a single guide on eac side of the shaft for en agement by said-head, means on said skip or engaging said guide, a crosshead guide in the tipple parallel to said shaft guide but disposed rearwardly thereof and engaged as said head leaves said shaft guide, a pair of rollers on said skip near the upper end thereof and a second pair of rollers on said skip near the lower end thereof, a pair of channel guides in the tipple for receiving said first pair of rollers, another pair of channel guides for receiving said second pair of rollers, the outer member of said first channel guides bein fashioned to provide stops for the upper r0 lers to serve as a fulcrum for the overturning of said skip, the other members of said first guide being extended upwardly and provided with a stop to limit upward travel of said skip in overwind, the said second guides being curved outwardly toward the chute and then u wardly to permit overwind of the skip wit out causing inward movement of said ski in dumping position, and a stop in sai second pair of guides.

9. In an apparatus of the class described, in combination with a shaft and a tipple, a cross-head, a skip bod connections between said cross-head and skip-body, a uide in said shaft for said cross-head, a m e in the tipple for said cross-head, out o alignment with said first guide, and engaged by said head as it leaves said first guide, and other means in the tipple for guiding said skip into'dumping position.

10. In an apparatus of the class described, in combination with a shaft and a tipple, a cross-head, a skip body, connections between said cross-head and skip body, a guide in said shaft for said cross-head, a guide in the tipple for said cross-head, out of alignment head as it leaves said first guide, other means in the tipple for guiding said skip ing posit1on, said latter uides 'eing curved away from said shaft in t e same direction.

11. In an apparatus of the class described,

in combination with a shaft and a tipple, a cross-head, a ski connections between said cross-head and said skip, a guide in said shaft for said cross-head, a uide in the tipple for 'said cross-head out o ali nment with said first guide and engageable by said cross-head as it leaves said first guide, other aides in the tipple for guiding said skip' into umping position, and means on said skip for engagin said first guide while said skip moves in sai shaft. 4

12. In an apparatus of the class described, in combination with a shaft and a tipple, a cross-head, a skip, connections between said cross-head and said skip, a guide in said shaft for said cross-head, a guide in the ti le for said cross-head out of ali ment wit said first guide and engageable y said cross-head as it leaves said first guide, tipple uides in the tipple for guiding said skip into dumping position, means on said skip for engaging said first guide while said skip moves in said shaft, said tipple guides servin to guide said skip after said skip leaves sai first ide.

13. In an apparatus of the c ass described, in combination with a shaft and a tipple, a crosshead, means for raising and lowering the crosshead in the shaft, a sklp, means for pivotally suspendin the skip from the crosshead, a guide in t e shaft, separate means on the crosshead and skip engaging this guide for maintaining both in vertical positions during travel through the shaft, the shaft guide terminating at the tipple, separate tipple guides for the crosshead and the skip, and means on the (prosshead and skip for engaging the tipple gui es.

14. In an apparatus of the class described, in combination with a shaft and a tipple, a crosshead, means for raising and lowering the crosshead in the shaft, a skip, means for pivotally suspendin the skip from the crosshead, a guide in the shaft, separate means on the crosshead and skip engaging this guide for maintaining both in vertical positions during travel through the shaft, the shaft guide terminating at the tipple, a vertical tipple guide for the crosshead, and curved tipple guides for the skip adapted to dump the-skip, and means on the crosshead and skip for engaging the separate tipple uides, before losing guidinggngagement wit the first mentioned shaft 15. In anapparatus of the class described, in combination with a shaft and a tipple, a crosshead, means for raising and lowering the crosshead in the shaft, a skip, means for pivotally suspending the skip from the crossinto dump- Y vchute, one of said guides being formed with with said first guide, and engaged by said 5 to cooperate to dump the skip, and means on the crosshead and the skip for independently engaging the several tipple guides, before the 10 orosshead and skip have passed out of engagement with the shaft guide.

ANDREWS ALLEN.

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