US1949553A - Cable drum construction for rotary draw-works - Google Patents

Description

I March 6, 1934.

G. TREMOLADA CABLE DRUM CONSTRUCTION FOR ROTARY DRAW WORKS 4 Sheets-Sheet 2 Filed Jan. 20, 1932 flTTaRA/Ex March 6, 1934. a. TREMOLADA CABLE DRUM CONSTRUCTION FOR ROTARY DRAW WORKS Filed Jan. 20, 1952 4 Sheets-Sheet 3 [Wm me: 62/62/51 x70 2519704404,

March 6, 1934.-- e. TREMOLADA CABLE DRUM CONSTRUCTION FOR ROTARY DRAW WORKS Filed Jan. 20, 1952 4 Sheets-Sheet 4 [Wm 7&6 Qua; IEL ya7e/vamm I flrmm/ x Patented Mar. 6, 1934 CABLE DRUM'CONSTRUCTION FOR ROTARY DRAW-WORKS Guglielmo Tremolada, Los Angeles, Calif., u-

signor to Emsco Derrick a Equipment Company, Los Angeles, Calif., a co p ration of California Application January zo, 1932, Se'rialNo. 587,719

' 22 Claims. (01. 254-187) My invention relates to the well drilling industry and relates particularly to a draw-works apparatus which is employed in this industry, which draw-works apparatus includes a novel rotary 5 drum construction.

Inthe drilling of an oil well it is common practice to employ what is known as a draw-works for handling the drill pipe and other apparatus which is lowered into the well. This draw-works is ordinarily positioned on one side of the derrick floor and includes the rotary drum upon which a hoisting cable is wound. Due to the fact that in the drilling of deep wells, which are now as deep as eight and ten thousand feet, the weight of the .drill pipe supported by means of a travelling block attached to the hoisting cable is very great, it is necessary to provide the drum of the draw-works with very powerful braking elements so that the load may be properly handled and so that the danger of the drum rotating out of control while carrying a heavy load is obviated.

In numerous types of draw-works with which I am familiar it is customary to provide a rotary drum which comprises a drum body formed of a cylindrical cable spooling portion, to each end ofwhich is attached a flange, these flanges serving to support the'brake rims, which rims are secured directly to the flanges by riveting. It is known that a great percentage of the load strain occurs object of my invention to provide a, rotary drum s which includes a one-piece body having a hub portion provided on each end thereof, there being reinforcing webs between the hubs and the flanges of the spooling portion to resist lateral rope stresses. These hub portions'are adapted to removably support brake rim units which are interchangeable and which are easily and quickly removed for replacement in the event of breakage of the brake rims without dismantling the drum from the drum shaft. I

One of the important objects of my invention resides in the provision of a combination including draw-works and a rotary drum of the characas ter described having a pair of brake rims on each end thereof which are adapted for frictional engagement with brake bands, thus doubling the braking efllciency obtained by a given size and weight of brake.

It is another object of my invention to provide in a draw-works a drum of the character de--,

scribed, which drum has associated therewith a cooling means adapted to deliver a cooling fluid to certain portions of the drum.

It is another object of the invention to provide in combination with a rotary drum'of the character described means associated with the drum rounding brake rims on opposite. ends of the rotary drum, these bands 'being actuated bye. lever to frictionally engage the rims to support the load on the rotary drum. The size and weight ofthis type of brake has been increased in practice to almost a prohibitive point in order to increase their braking efliciency underload. This increase in size and weight of the brakes has naturally increased frictional forces caused by brake drag to such an extent that, when the rotary drum is. running free without aload this brake drag together with the frictional forces caused by the various combinations of drum drive sprockets and chains frequently prevent the drum from rotating so that the empty travelling block cannot be lowered. v V It is an object of my invention to provide-a rotary drum which is freely rotatable on the drum shaft, which in turn is rotatably "subverted. by

the machinerysupports ofjthe draw-works so that the drum may beallowed to rotate relative to the drum shaft when running free.

It is another object r y invention ton ue vide in a draw-works of the type described in the above paragraph a clutch means between. drum shaft and therotary drum wmcnmsyba manipulated atwill to cause the drum to rotated with the drum shaft or to allow the drum to rotate relative thereto.

One of the features of the invention in the provision of a rotary drum of the character l by the line 4-4 of Fig. 3.

described which is rotatably mounted on a drum shaft by a pair of bearing units, the unit on one end of the drum being longitudinally fixed, while the unit on the other end of the drum is free to allow relative longitudinal movement between lmgdrum and the shaft to compensate for expansion in the drum.

Another important feature of my invention resides in the provision of a free spooling drum, as described above, having a clutch member between the drum and the drum shaft, one part of the clutch member being removably secured to the drum and the other part to the drum shaft,

'so that in the event of breakage in the clutch member the parts thereof may be" removed for replacement without disturbing the drum relative to the drum shaft.

These objects as well as the above described features will be made evident in the following part of the specification. There are numerous advantages obtained by reason of the, unique construction of my invention, these advantages be! ing too numerous to mention in the statement of invention, but which will be emphasized dur 7 ing the course of the following detailed descripembodying the features of my invention.

2 is an end elevational view of the drawworks taken as indicated by the arrow 2 of Figs 1.

F18. 3 is a longitudinal sectional view taken on a median plane through the rotary drum of the invention.

Fig. 4 is'a vertical section taken as indicated Fig. 5 isa partially sectioned elevational view of the drum body with the brake rim units removed therefrom.

' Fig. 6 is "scene elevation of the drum body taken as indicated by the arrow 6 of Fig. 5.

? Fig. I is 9'. partially sectioned elevatlonai view of one of the brake rim units dismounted-from;

the drum.

Fig.- 8 is .a fragmentary sectional view taken as indicated by the line 8-8 of Fig. 3, thisview showing thejmanner in which the CIIItOhI- DlFQIIlJ-Kx her and one of the bearings of the invention iarej keyed to the drum body.-

Referring to Figs! and 2 in particulanfthe 20. The drive shaft 211s adapted'gto bedriven froma suitable prime mover and isfadaptedto drive the line shaft 22 by means of a chain and sprocket arrangement including a chain 28 and sprockets 29 and 30 which are secured to the drive shaft 21 and the line shaft 22, respectively. The

ends of the drum shaft 23'project beyond the posts 20 and are provided with chain and sprocket drive means whereby the line shaft may be caused to drive the drum shaft 23. At the leftward end of the draw-works there is a primary chain and sprocket drive means 32, and at the rightward end of the draw-works there is a secondary chain and sprocket drive means 33,-each of which includes a chain which extends over sprockets connected to the line shaft 22 and the drum shaft 23. In order that either of the chain and sprocket drive means may be selectively employed to drive the drum shaft, there is provided a clutch 34 at one end of the draw-works and a clutch 35 at the other end thereof, either of which clutches may be actuated so that either of the drive means may be brought into operation.

Secured to the drum shaft is a drum 36 having a body 37 providing a central cylindrical spooling portion 38 on which a cable may be wound.

Mounted on the drum 36 adjacent the spooling I portion 38 are brake rim portions 39 which are adapted to accommodate brake bands which, when properly operated, will apply braking forces to the drum 36.

, Coming now to the details of construction of the drum 36 with reference to Figs. 3 to 8 inclusive, I show the drum body 37 as comprising an interiorly webbed, hollow. cylindrical shell 40 provided with a pair of integral outwardly extending flanges 41 which cooperate with the cen-' tral cylindrical portion 38 to form the cable spool of the drum.

Formed at each end of the body-3'7 is an integral hub portion or hub structure 42 comprising an inner annular ring or inner hub 43 and an outer annular ring or outer hub 44. The inner ends of the inner rings 43'of the hub structures 42 are integrally connected to the cylindrical shell 40 by solid conical walls 45, and the outer rings 44 are integrally connected to the inner rings 43 by suitable annular webbing 47. Formed betweenthe; outer surfaces of the flanges 41 and the inner ends.

of the outer'rings 44 are a plurality of integraL' radially extending webs 48, these webs serving to in the annular web 47 are aplurality of openings 50 which form longitudinal passages between the inner and outer rings 43 and 44, which communicate with spaces 51 betweeifthe radial webs 48,

inTthemanner shown best in Figs. 3, 5 and 6.

The inner ring 43 at the leftward; endof the body is adapted to receiveaebearing carrier 55,-an'd the ring'43 at the rightward end of ithe body 37 is adapted-to receive a bearing carrier v, 56. Thebearingcarriers 55 and 56 each comprise' a retaining shell 57 which provides a cupshapedrecess 58' adapted to receiveja pair of annular'roller bearings-.59 between'which is positioned a splitspacer ring 60seated in an annular groove61 provided in .the'drurn shaft 23, substantially in the-manner showikin Fig. 3. The shell 5'7 of .the leftwardlbearingj carrier 55 is provided .withan outwardly extendingannular flange 62 on the outer-fiend thereof,- which flange is adapted for abutment against the outer surface 63 of the inner ring 43.... Abutting the outer surfacev of the flange 62 is a thrust ring 64 adapted to receive the end thrust of the cuter-bearing 59. The bearingicarrier 55, including the thrust ring 64, is

secured against longitudinal movement relative secured. directly to theshell 57 by bolt means 68,

as shown, so'that the rightward end of the drum body 37 may move longitudinally relative to the bearing carrier 56. as indicated by the arrow B. to compensate for heat expansion during the operation thereof.

Although the drawings disclose the rotary drum 36 rotatably mounted on the drum shaft as above described, it should be clearly understood that I believe my invention anticipates a rotary drum embodying all or a part of the independent features of novelty disclosed herein, the inner rings 43 of which drum may be secured drectly to the drum shaft, serving as drum supporting portions to'support the drum in non-roe tatable relationship with the shaft 23.

- The outer end of the rightward ring 43 is provided with an outwardly extending flange 70 in the outer face 71 of which is formed an annular recess 72 adapted to receive the secondary part 73 of a clutch member 74, the clutch part 78 being removably secured to the flange 70 by bolt means 75 in the. manner shown. As best shown in Figs. 3 and 8 the clutch part 73 is likewise keyed to the flange 70 by a radially extending key 75a adapted to resist shearing stresses imposed on the bolts '75. The inner end of the key 75a extends into a longitudinally extending keyway formed in the outer surface of the shell 57 and the thrust ring 64 of the bearing carrier 56, thus serving to prevent relative rotation but allowing relative longitudinal movement therebetween.

The secondary part 73 of the clutch '74 is provided with teeth 76 adapted for engagement with the teeth 77 of a primary clutch part 78 slidably but non-rotatably mounted on the drum shaft 23. The clutch part 78 is provided with an operating yoke indicated at 80 in Figs. 1 and 3, which may be manipulated in any suitable manner, such as by a foot pedalZjand connecting rod indicated by the numeral8l of Fig. 1. It will be understood that the vmar ipuiation of the clutch pedal 81 to selectivelyen'ga'ge and disengage the clutch parts andf78 serves to cause the drum to be driven by-the drum 'shaftorto allow the drum torotate freely relative thereto, at will.

Eachofthe' outer rings 44 of the hub 42 is provided at the inner'end thereof with an outwardly extending annular flange 85, the outer surface of the ring 44 and the flange cooperating to form a seat adapted to support a brake rim unit generally designated by the numeral 8'7.

Each of the units 8'7 comprises a pair of dishshaped annular brake rims 88 providing verti- I cally extending walls 89 and annular walls 90, the axes of which extend perpendicular to the walls 89. The rims 88 are positioned with their vertical walls 89 adjacent and their annular walls 90 extending in opposite directions.- Positioned between the vertical walls 89 of the rims 88 is a spacing disc 92. abutting the outer sides of the walls 89 are a pair of supporting rings 95, each providing an annular portion 96 and a vertically extending portion 97. The supporting rings 95,

the rims 88, and the disc 92 are secured rigidly tions 97- of the rings 95, the vertical walls v89 of the rims 88 and the disc 99, in the manner shown in Fig. 3. The units 87 are positioned on the 1 ring 44 with one of the annular portions 96 abut- Formed on the peripheral edge of the disc 92 is an enlarged bead 102 of such a width as to overhang the annular walls 90 ofthe ring 88. Formed on the peripheral edges of the drum flanges 41 are'laterally extending annular pro- Jections 103 which overhang the innermost brake rims 88. The bead 102 and the projections 103 are provided as a safety precaution to prevent the annular portion 90 of the rims being thrown completely off of the drum. should breakage occur at the intersection of the walls 89 and 90 of the rims 88 during the operation of the drum.

Corning now to .a description of the braking arrangement of the draw-works I provide brake bands 105 adapted to, partially surround the rims 90 of the units 87. the fixed ends of these bands being connected to a single anchoring bar 106 which is secured in any suitable manner, such as by bolting. to the derrick floor in the manner shownin Fig. 1. The free ends of the bands are secured to a single operating crank 107 which is provided with an operating lever 108, the op- 95 eration of which is such that when the lever 108 is depressed in the d'rection of the arrow 0" of Fig. 2, a pull in the direction of the arrow "D" is exerted simultaneously on the bands 106, serving to tighten the bands into frictional engagement with the brake rims 90.

In connection with the draw-works embodying my invention I may optionally provide a cooling means for the bearings 55 and 56 and for the braking units 88. This cooiing means comprises 103 delivering pipes 110 having a plurality of delivery nozzles adapted to continuously deliver 7 Jets of a coolng fluid, such as water, to desired too portions of the drum 36. For example, at each end of the drum 36 a nozzle 111 may be provided 110 to project a continuous jet of fluid in longitudinal directions through the openings 50 in the web 4'7, as indicated at 112 in Fig. 3, a portion of this fluid contacting the outer surface of the -inner rings 43 to cool the bearings 55 and 56, the fluid 15 then being forced outwardly through the radial openings 51, as indicated by the arrows "E", by centrifugal force and bathing the entire inner surfaces of the inner. rims 90 before being dispelled through the spaces 113 between the periphcries of the flanges. 41 and the rims 90. In order to retard the centrifugal flow of this cooling fluid through the spaces 113 so that the fluid will not be thrown to an undesirable distance over the derrick floor, I provide a laterally extending annular rib 114' on the outer surface of each of the flanges 41, these ribs being only'of slightly smaller diameter than the inner diameter of the rims 90. The action of these ribs is to divert the cooling fluid away from the spaces 113, as indicated by the arrowsF", thus serving to recirculate a por- I tion of the fluid and allowing the fluid topass outwardly through the spaces ,113'ata propor'- tinately slow rate of flow. T

Another nozzle 115'may be'positi'o'ned' at "each end of the draw-works and'adapted to-directa Jet of fluid to drench the inner surface of the outer rims 90, as shown at 116'in Fig. 3. h In order to prevent a disproportionate return flow of fluid through the passages 50 in the di-' lip 124. The flange 121 of the cowl 120 is' of such a diameter as to extend outwardly a distance sumcient to abut the outer surface of the outer supporting ring 95 in such a manner as to serve 1 rection of the arrows "6","! provide an annular as an additional securing means preventing longitudinal movement of the units 87 relative to the hub portion 42.

The formof my invention which I have disclosed in this application is specifically what I at the present time believe to be the most satisfactory form. It may occur, however, that changes in structural details, such as the removal of the bearings 55 and 56 so that the drum may be fixed to the drum shaft 23 as above mentioned, or a different arrangement of parts may be necessary to meet the structural needs of different types of draw-works which may be employed in th oil industry.

I believe that my invention incorporates certain novel features which have never before been utilized in a combination of the character of my invention. I

Furthermore, I am aware that certain portions of my invention are susceptible of independent use, and, although all the parts thereof cooperate to form a patentable combination, I do not wish the scope of 'my invention to be construed as be- I am aware}," that..certain structural changes might"beff; made;iithat other embodiments'of the invention might be devised-and that certain subcombinations of the elements comprising my indrum vention might be utilized, all of which would come within the scope of my invention.

It is my desire that the breadth of my invention be construed in accordance with the ap pended claims considered in connection with the statement of invention as defined in the specification.

I claim as my invention: 1. In a rotary drum adapted for mounting on a rotatable drum shaft of a draw-works, the

.combination of: a one-piece body providing a cylindrical cable spooling portion having a pair of relatively spaced outwardly extending flanges, each end of said spooling portion terminating in a double walled hub portion comprising an outer J annular ring upon each of which is removably mounted 'a braking unit, each of said units including a pair of dish-shaped brake rims, each having an annular wall and a wall perpendicular to the longitudinal axis of said annular wall, said perpendicular walls beingsecured to a supporting ring adapted for removable mounting on said outer ring, so that said annular portions extend in opposite directions and are adapted for frictional engagement with suitable brake bands, and an inner hub supporting'portion adapted to support said hub on said drum shaft, said outer ring and said inner hub supporting portion being in- -tegrally connected to said spooling portion by suitable webbing which provides longitudinal passages between said inner supporting portion and said outer ring and radial openings between said outer rings a'nd said fianges; means for directing a continuous flow of cooling fluid through said passages and said openings for the purpose of drenching certain portions of said'drum; and means on said drum for retarding the centrifugal flowof fluid from said drum during the rotation thereof.

supporting portion adapted to support said drum on said drum shaft and an outer brakesupporting portion adapted to removably support a brake rim unit comprising a pair of brake rims adapted for frictional engagement with suitable brake bands; and means associated with said brake rims for preventing said rims from being thrown oute wardly from said drum by centrifugal force should breakage of said rims occur during the rotation of said drum.

3. In a rotary drum adapted for mounting on a rotatable drum shaft of a draw-works, the combination of: a one-piece body providing a cylindrical cable spooling portion having a pair of relatively spaced outwardly extending flanges, each end of said spooling portion terminating in a double walled hub comprising an inner drum supporting portion adapted to support said drum on said drum shaft and an outer brake supporting portion adapted to removably support a brake rim unit comprising a pair of brake rims adapted for frictional engagement with suitable brake bands; means associated with said brake rims for preventing said rims from being thrown outwardly from said drum by centrifugal force should breakage of said rims occur during the rotation of said drum; and means for continuously delivering a cooling fluid to certain portions of said 4. a rotary drum adapted formounting on arotatable drum shaft of a draw-works, the combination of: a one-piece body providing a cylindrical cable spooling portion having a pair of relatively spaced outwardly. extending flanges, each end of said spooling portion terminating in a double walled hub comprising an inner drum supporting portion adapted to support said drum on said drum shaft and'an outer brake supporting.portion adaptedto removably support a brake rim unit comprising a pair of brake rims adapted for frictional engagement with suitable brake bands; means associated with said brake rims for preventing said rims from being thrown outwardly from said drum by centrifugal force should breakage of said rims occur during the rotation of said drum; means for continuously delivering a cooling fluid to certain portions of said drum;

and means on said drum for retarding the centrifugal flow of said fluid from said drum during the rotation thereof. 5. In a drum construction of the class described, the combination of a spooling portion; an inner hub at one end thereof; an outer hub surrounding and spaced from said inner hub; andbrakedrum means removably secured to said outer hub. 6. In a drum construction of the class described,

the combination of: a spooling portion; an inner hub at one end thereof; an outer hub surrounding and spaced from said irmer hub; brake-drum means removably secured to said outerhub; and radially extending web means spaced from said outer hubs.

7. In a drum construction of the class described,

spooling portion and connected to said innerand',

the combination of a spooling'portion; an inner hub at one end thereof; anouter hub surrounding and spaced from said inner hub; a flange extending outwardly from said spooling portion and extending radially beyond said outer hub; brakethe combination of: a spooling portion consisting of an annular wall having a space therewithin:

an inner hub 'at one end thereof which is of smaller diameter than said spooling portion; a

flange extending radially outwardly from said spooling portion; an outer hub adjacent said flange, and being smaller in diameter than said flange; web means connected to said outer hub and said flange; and vbrake-drum means supported by said outer hub.

' outer hub adjacent said flange, and being smaller in diameter than said flange; web means con 'nected'to said outer hub and said flange; other web means connected to said inner and outer hubs; and brake drum means supportedv by said outer hub. I

10. In a drum construction of the class de-' scribed, the combination of a spooling portion;

an irmer hub at one end thereof; wall means connected'to said inner hub and'said spooling portion; a flange extending radially outwardly from said spooling portion; an outer hub adjacent said flange, and being smaller in diameter than said flange; web means connected tosaid outer hub and said flange; and brake-drum means supported by said outer hub.

11. In a'drum construction of the class describedpthe combination of a spooling portion; an inner hub at one end thereof; wall means connected to said inner hub and said spooling portion; a flange extending radially outwardly from said spooling portion; an outer hub adjacent said flange, and being smaller in diameter than said flange; web means connected to said outer hub and said flange; other web means connected to said inner and outer hubs; and brake-drum means supported by said outer hub. I

12. In a drum construction of the class described, the combination of z a spooling portion;

an inner hub at one end thereof; a flange extending radially outwardly from said spooling portion; an outer hub adjacent said flange, and being smaller in diameter than said flange; web

-meansconnected to said outer hub and said flange; other web means connected to said inner and outer hubs; brake-drum means supported by said outer hub; and bearing-retainer means positioned within said inner hub.

13. In a drum construction of the class described, the combination of a spooling portion; an inner hub at one end thereof; wall means connected to said. inner hub and said spooling portion; a flange extending radially outwardly from said spooling portion; an outer hub adjacent said flange, and being smaller in diameter than said flange; web means connected to said outer hub .and said-flange; brake-drum means supported by said outer hub; and bearing-retainer means positioned within said inner hub.

14. In a drum construction of the class de-' scribed, the combination of a spooling portion; an inner hub at one end thereof; a flange extending radially outwardly from said spooling portion; an outer hub adjacent said flange, and being smaller in diameter than said flange; -web means connected to said outer hub and said flange; a shoulder at the inner part of said outer hub; a brake-drum means supported on said outer hub; and securing means for securing said brakedrum' means against said shoulder.

15. In a drum construction of the class described, the combination of: a body providing a cylindrical cable spooling portion having a pair of relatively spaced outwardly extending flanges, each end of said spooling portion terminating in a double walled hub portion comprising an outer annular ring upon which a plurality of brake rims are mounted, said rims being adapted for frictional engagement with suitable brake bands; and an inner hub supporting portion adapted to support said body, said inner hub supporting portion and said outer rings being integrally connected to said spooling portion by suitable webbing which provides longitudinal passages between said hub supporting portion and said outer rings and radial openin'gs between said outer rings and said flanges.

16. In a drum construction of the class described, the combination of: a one-piece body providing a cylindrical cable spooling portion having a pair of relatively spaced outwardly extending flanges, each end of said spooling portion terminating in a double walled hub portion comprising an outer annular ring upon each of which a pair of brake rims is mounted, said rims being adapted for frictional engagement with suitable brake bands; and an inner annular ring adapted to receive a suitable bearing for rotatably supporting said body, said inner rings and said outer rings being integrally connected to said spooling portion by suitable webbing which provides longitudinal passages between said inner rings and said outer rings and radial openings between said outer rings and said flanges.

17. In a drum construction of the class described, the combination of: a body providing a cylindrical cablev spooling portion having a pair of relatively spaced outwardly extending flanges, each end of said spooling portion terminating in a double walled hub portion comprising an outer annular ring upon which a plurality of brake rims are mounted, said rims being adapted for frictional engagement with suitable brake bands, and an inner annular ring adapted to receive a suitable bearing for rotatably supporting said body, said inner rings and said outer rings being integrally connected to said spooling portion-by suitable webbing which provides longitudinal passages between said inner rings'and said outer rings and radial openings between said outer rings and said flanges; means for directing a continuous flow of cooling fluid through said passages and said openings for the purpose of drenching certain portions ofsaid drum; and means on said drum for retarding the centrifugal flow of cooling fluid from said drum during the rotation thereof.

18. In a drum construction of the class described, the combination of a one-piece body providing a cylindrical cable spooling portion having a pair of relatively spaced outwardly extending flanges, each end of said spooling portion terminating in a double walled hub portion comprising an outer annular ring upon each of which is removably mounted a braking unit, each of said units including a pair of coaxial annular rims secured in longitudinally spaced relationship to a supporting ring. which is adapted for removable mounting on said outer ring of said hub portion, said rims being adapted for frictional -en-. gagement with suitable brake bands, and. an inner annular ring adapted to receive a suitable bearing for rotatably supporting said body, one

of said bearings at one end of said hub being longitudinally fixed relative thereto, andthe other hub, said inner rings and said outer rings being integrally connected to said spooling portion'by suitable webbing which provides longitudinal passages between said inner rings and said outer rings and radial openings between said outer rings and said flanges; means for directing a continuous flow of cooling fluid through said passages and said openings i'orthe purpose oi drenching certain portions 01' said drum; and means on said drum for retarding the centrifugal flow of cooling fluid from said drum during the rotation scribed, the combination oi: a spooling portion;

an outwardly extending flange at the end of said spooling portion; an inner hub at one end thereof; an outer hub surrounding said inner hub and being spaced from said flange; web means-connecting said outer hub and said flange; and brake-drum means on said outer hub.

22. In a drum construction of the class described, the combination of: a spooling portion; a flange extending outwardly from said spooling portion; an outer hub adjacent to said flange; a brake-drum means supported by said hub; and means on said flange providing a channel into which a portion of said brake-drum means extends.

GUGLIELMO TREMOLADA.

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