US2420050A - Hoist drum - Google Patents

Description

y 6, 197. J. H. MAUDE 2,420,050

HOIST DRUM Filed March 21. 1945 7 Sheets-Sheet 1 I 4 I 1 I I nab m; 6 5 R\SER gmg'rs ROPE GROOVE M5 6- HERE 0 5 STARTS HERE ATO i3 AT (0N STA NT LEAD v FILLER Mm m? wiDTH HERE \fl I AT 0 J a7 as 1 8 ii b 31 1%- I Q i 4- FACE OF RlSER MACHINED i 3 AS ROPE GROOVESWITH 5A HEAD; NVENTOR FACE 0F F\LER MACHlN ED J.H.MAUDE wn'u sAME LEAD As ROPE sRoovzs.

ATTORNEY May 6, 1947.

J. H. MAUDE HOIST DRUM Filed March 21, 1945 7 Sheets-Sheet 2 RISER STARTS HE E INVENTOR J.H-MAUDE WMM JM ATTORNEYS J. H. MAUDE May 6, 1947.

HOI ST DRUM 7 Sheets-Sheet 5 Filed March 21, 1945 MACHINE 8 HANDDRESS RADIUS 1; Lane EQUAL TO ABOUT /8 XROPE DIA.

MACH l NED WITH SAME LEAD AS ROPE GROOVE S F o m D m e m w w R D u do E 4 K 20.5% $6 M 4 5 m 4. gm zfl uzo u W U 9 A 6 w 6 i TmwA E H M. II. P

maowmzo I L WW. @1423 H .A F N E 2 1| p M w H L L I A m T A P6 H L o z I. In H F E CM... W F W h L P F H KL 5 m PM E M E (0 m n .\A \Z 7 j Km 6 THiS FACE MACHINED W\TH SAME LEAD-AS ROPE -GROOVE$ EAD=PITCH=SLIGHTLY GREATER THAN R ALL D lMENSlONS MARKED \NVENTOR J.H.MAUDE ATTORNEYS ay 6, 1947. J. H. MAUDE 1 ,4

HOIST DRUM Filed March 21, 1945 7 Sheets-Sheet 4 TURNTURN TURN W14 FIB ilb

90 WITH our msER \NVENTOR v J-H-MAUDE ,J. H. MAUDE HOIST DRUM May 6, 1947.

Filed March 21 1945 7 Sfieets-Sheet 5 E70 wm-| OUT FILLER 870W|TH FILLER FIG. 13

INVENTOR r J-H-MAUD E W144i:

ATTORNEYS Patented May 6, 1947 UNITED STATES PATENT OFFICE HOIST DRUM John H. Maude, Montreal, Quebec, Canada, as- .signor to Dominion Engineering Works Limited, Lachine, Quebec, Canada Application March '21, 1945, Serial No. 583,913

3 Claims. (01. 242-117) This invention relates to improvements in the manufacture of hoist drums and has particular reference to hoist drums used in mining operat'ions.

Hoist ropes used in mine hoists are often 4000 to 5000 feet long. Single layer winding of these long ropes on the hoist drums would require drums of excessive width and, since themaximum permissible fleet angle from the drum to the head sheaves is usually limited to 1 the hoist would be located too far back from the mine shaft. For these reasons the ropes are usually helically wound on the drum in two or three layers.

In order to prevent damage to the hoist rope during the multiple layer helical winding thereof, it has been proposed to provide the hoist drum with separately formed filler and riser elements, the filler element being attached to the drum flange at the same end of the drum as the rope anchorage and the riser element being attached to the drum flange at the end of the drumre'mote from the rope anchorage. The purpose of the filler is to fill up the space that would otherwise be left between the first helical anchorturn of the first layer of rope and the adjacent drum flange and to thereby prevent the last turn of the second reversely wound layer of rope being pinched between the first turn of the first layer and said flange. The purpose of the riser is to gradually lift the last turn of the first layer of rope out of the drum rope grooves to a sufiicient height above the cylindrical surface of the drum so that this turn becomes the first turn of the second reverscly wound layer of rope. In the absence of the riser the last turn of the first layer is crowded off the drum by the next preceding turn which, during rotation of the drum in a rope winding direction, approaches closer and closer on the helical angle to the adjacent drum flange, thus leaving less. and less room for the last'turn which is thus subjected to pinching and excessive wear.

The fillers and risers heretofore employed have consisted of separately formed elements machined to the required shape from bar stock and secured to the drum flanges by welding or screw fastenings. It has not heretofore been feasible to design these filler and riser elements so that they will cover mor than 200 of the drum circumference. In this connection it may be explained that the filler is formed so that, in its ap plied position, its circumferential surface is concentric with but projects beyond the grooved c'ircumferential surface of the drum. The inner face of the filler which is perpendicular to the cylinz- 2 drical surface of the drum is machined to present a helical surface having the same lead as the helical rope grooves of the drum. In order to completely fill the space left between the first or anchor turn of the first layer of rope and the ad- ,jacent drum flange, the filler should extend around the entire circumference of the drum but, in making the filler from separate bar stock, there are practical limits which prevent the fiile'rbeing designed so that it will cover more than 200 of the drum circumference. In this connection it will be readily understood that if the "separately formed filler was machined from bar stool; to extend around the complete circumference of the drum, the thinner portions of the filler would be of such reduced section that it would be difiicult, if not impossible, to securely anchor these thin portions of the filler to the flange or spider of the drum by either welding or fastening screws. Moreover, the machining "from bar stock of a properly designed 'fil-ler capable of extending around the entire circumference of the presents serious machining difficulties. It may also be pointed out that welding of the filler element to the drum flanges is not feasible in the case of drums equipped with iron flanges but requires the'use of steel flanges. In the case of iron drum ilanges the use of "fastening screws mdst be resorted to and if the separately formed liner is designed to extend around the entire circumference of the drum, the thin portions of the filler have not suflic'ient section to permit them tobe secured in place by fastening screws. As 'a man ter of fact, even when the separately formed 'fi1l= ers are designed in accordance with conventional practice to cover not more than 200 of the oncumf'erence of the drum, the thinner portions thereof cannot be securely fastened in place by fastening screws with the result that the filler is often sheared ofi in service and damages the ropes so seriously as to require its immediate replacement. Moreover, a filler which covers not moreth'a'n 200 of the circumference of the drum presents an appreciable shoulder effect at the thin end which is objectionable. The same remarks apply in the case "of riser elements formed and applied to drum hoists in accordance with conventional practice.

The present invention provides a drum q pped with filler and riser elements which extend around the entire circumference of the drum and are produced by simplified machining procedure capable of being conveniently and satis factorily performed by a lathe or boring mill.

5 This invention makes possible the formation of filler and riser elements which are proportioned and shaped to give a more correct rope action without danger of pinching or crowding than can be obtained by the best procedures heretofore available.

The invention will be more readily understood from the following detailed description of the accompanying drawings, in which- Fig. 1 is an end view of a hoist drum equipped with filler and riser elements produced in accordance with my invention.

Fig. 2 is an elevational view of the drum shown in Fig. 1.

Fig. 3 is a sectional view alongthe section line 3-3 of Fig. 2 and includes legends and other data relevant to the formation of the filler element shown therein.

Fig. 4 is a sectional view along the section line 4-4 of Fig. 2 and includes legends and other data relative to the formation of the riser element shown therein.

Fig. 5 is an enlarged detail view with legends and other relevant data of that portion of the drum which is enclosed by the circle X shown in Fig. 2.

Fig. 6 is an enlarged detail view with legends and other relevant data of that portion of the 'drum' which is bounded by the circle X shown in Fig. 2.

Figs. 7 to inclusive are diagrams illustrating the manner in which the filler and riser elements ensure correct rope action without danger of pinching or crowding. These views also illustrate the section contour and action of the filler and riser elements at selected points around the circumference of the drum.

Fig. 16 is a view illustrating the incorrect rope action, pinching and crowding which occurs in the absence of the riser element.

- Fig. 17 illustrates the incorrect rope action, pinching and crowding which occur-s in the absence of the filler element.

Fig. 18 is a view showing the manner in which the component parts of the drum are preferably formed and assembled. I

Fig. 19 is a view similar to Fig. 18, but showing the filler and riser elements as they appear in their original cast condition prior to being machined to the required diameter and finished shape indicated by dotted lines.

Figs. 20 and 21 are view-s similar to Figs. 18 and 19 but showing a modified arrangement in which the filler and riser elements are machined from the parent metal of the drum shell.

Referring more particularly to the drawings, 5 designates a hoist drum including a cylindrical rope winding portion 6, end flanges 1 and 8, drum supporting spiders 9 and lo, a filler element ll and a riser element l2. These elements may be formed as integral parts of a. single casting but are preferably fabricated and assembled as illustrated in Figs. 18 and 19. As here shown the cylindrical portion 6 comprises a hollow tubular member having its ends fitted on and welded or otherwise secured to cylindrical portions 911 and 10a of the spiders 9 and I0 which are formed as separate castings. The flange 1 and filler element II are cast integral with spider 9 and the flange 8 and riser element l2 are cast integral with spider ID. The filler element II and riser element l2 are initially cast to the shape shown in Fig. 19 and, together with the other component parts of the drum assembly, are machined to the finished, shape shown in the preceding figures by 4 the specific machining procedure hereinafter described.

The filler element ll extends around the entire circumference of cylindrical portion 6 at the inner side of flange I. This filler is machined from the parent metal shown in Fig. 19 so that it presents a'eircumferential surface I la which projects beyond but is concentric with the circumferential surface of the cylindrical portion 6. The face llb of filler II is machined to the same helix as the helical rope groove l4 (shown as left hand helix) which begins adjacent the minimum width portion of the filler (located at the point indicated by 0 in Figs. 1 and 2), extends around the cylindrical portion 6 toward the flange- 8, and terminates a predetermined distance short of the beginning of the lifting surface of the riser l2 as will be clear from subsequent discussion of the contour of said riser l2. The face I lb of the filler (compare Figs. 2 and 7 to 15 inclusive) varies from zero to one pitch in 360 and, as clearly'indicated in Figs. 2 and 7, the minimum width of the filler is at zero and equals about times rope diameter. The rope groove l4 startsat 0 (Figs. 1 and 7) with constant lead and suitable pitch characteristics such, for example, as those indicated by the applied legends in Fig. 5. The face I lb of filler ll is transversely curved on the same radius as the rope groove l4.

A portion of the hoist rope which is wound around the grooved surface of the drum is indicated at l5. The anchor end (not shown) of this rope is passed through a rope anchorage opening l? formed in the cylindrical portion 6 and the spider 9 and is anchored to said spider in the usual manner such, for example, as by means of the rope anchor plate l8 shown in Figs. 1 and 3. The rope anchorage opening I1 is located at the beginning of the starting portion of the rope groove l4 immediately adjacent the minimum width portion of the filler l l, as shown to advantage in Fig. 2.

The rope riser I2 is eccentrically machined from the parent metal shown in Fig. 19 as indicated by dotted lines so that it presents a rope lifting surface l2a which is eccentric to the cylindrical surface of the cylindrical portion 6 and extends around the entire circumference of said portion 6. The rope lifting surface l2a begins at the 0 point indicated in Fig. 4 and proceeds around the cylindrical portion 6 in the direction indicated by the arrow Z. From the beginning or 0 point indicated in Fig. 4 the rope lifting surface l2a gradually rises above the cylindrical surface of the drum portion 6 until it reaches, at 180, a predetermined maximum elevation (see Fig. 11) suflicient to lift the last turn A of the first layer of the rope out of the drum groove [4 to a sufficient height above the cylindrical surface of the portion 6 so that this turn A becomes the first turn B of the second layer of the reversely wound turns which are wound on top of the first layer. From its point of maximum elevation at 180 the elevation of the rope lifting surface lZa of the riser gradually diminishes to zero at the aforesaid starting or 0 point. The face In of the riser is machined to the same helix as the rope groove l4 so that it varies from one pitch to zero in 360. The action of this riser as regards lifting the rope smoothly without pinching or crowding will be readily apparent from a study of the showing in Figs. 7 to 15 inclusive.

Fig. 16 shows the incorrect rope action and pinching which occurs in the absence of the riser as-the final turn of the first layer of rope is wound around the drum to form the first turn of the second layer.

Fig. 17 shows the incorrect rope action and pinching which occurs in the absence of the filler element. In this view the last turn of the second layer of rope is shown pinched between the first turn of the first layer and the adjacent drum flange.

In producing the hoist drum described herein the end castings affording the spiders 9 and H), the flanges and 8, and the filler and riser elements H and I2 are roughly machined to approximately the shape shown in Fig. 19 and then assembled with the tubular rope Winding portion 6. All concentric diameters, including the face Ila of the filler H, are then finished in the lathe or boring mill with the drum properly centered. The drum is then offset to enable the first offset diameter (see Fig. 4) of the riser surface In to be turned about the offset center C. When this turning operation is completed the drum is again offset in the opposite direction to permit the second offset diameter (also indicated in Fig. 4) of the face I211 of the riser to be turned about the center C. Following these offset turning operations the drum is again centered to enable the groove 14 and the helical faces [lb and 12b of the filler element II and riser element 12 to be machined to their finished contours. In this connection it will be noted that the terminal portions of the groove M are machined from the same parent metal as the riser II and filler l2. The helical faces of the filler and riser elements are machined by successive machining operations in the course of which the drum is appropriately tilted with respect to the line of travel of the cutting tool.

Instead of being machined from the parent metal of the drum flanges 9 and 10, the filler and riser elements I l and I2 may be machined from the parent metal of the shell portion of the drum as indicated in Figs. 20 and 21. In both cases substantially the same machining procedure is followed.

Having thus described what I now conceive to be the preferred embodiment of my invention it will be understood that various modifications may be resorted to within the scope and spirit of the invention as defined by the appended claims.

I claim:

1. A hoist drum comprising a tubular body portion, a radially projecting flange at one end of the body portion provided with an integral projection extending entirely around the inner side thereof and forming a filler element adapted to fill the space between the flange and the first turn of the first layer of rope helically wound around the body portion from a starting point adjacent said flange, said filler presenting an annular circumferential face concentric with but projecting a predetermined distance beyond the circumferential surface of the body portion and a helical inner side face which projects radially from the circumferential surface of the body portion and varies from zero to one pitch in 360, a second flange located at the opposite end of the body portion and provided with an integral projection extending around the inner side thereof and forming a riser element adapted to gradually lift the last turn of the first layer of rope as it is wound helically around the drum to form the first turn of the second layer which is helically wound around the drum in the reverse direction on top of the turns of the first layer, said riser element presenting an eccentric outer circumferential rope-lifting face which gradually increases from zero elevation to a predetermined maximum elevation above the circumferential surface of the tubular portion of the drum at 180 and then gradually decreases to zero elevation at approximately 360 and a helical inner side face which varies from one pitch to zero in 360 and has the same lead as the helical inner side face of the filler element.

2. A hoist drum equipped with a rope-lifting riser formed integral With and extending entirely around the inner side of one of the drum flanges, said riser element presenting an eccentric circumferentially extending rope-lifting face which varies from zero elevation above the circumference of the rope-winding shell of the drum to a maximum elevation above said rope-winding surface at 180 and then gradually decreases in elevation to its starting point, said riser element also presenting a helical inner side face varying from one pitch to zero in 360.

3. A hoist drum equipped with a rope-lifting riser element formed integral with the shell portion of the drum and extending entirely around said shell portion immediately adjacent the inner side of one of the drum flanges, said riser element presenting an eccentric circumferentially extending rope-lifting face which varies from zero elevation above the circumference of the rope winding shell surface of the drum to a maximum elevation above said surface at 180 and then gradually decreases in elevation to its starting point, said riser element also presenting a helical inner side face varying from one pitch to zero in 360.

JOHN H. MAUDE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,984,604 Stahl Dec. 18, 1934 1,913,508 Phillips June 13, 1933 1,444,002 Mossberg Feb. 6, 1923 1,245,231 Horton Nov. 6, 1917 810,490 Knupp Jan. 23, 1906 1,924,216 Smith et a1 Aug. 29, 1933

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