US2092774A

US2092774A - Hoisting mechanism

Info

Publication number: US2092774A
Application number: US21461A
Authority: US
Inventors: Robert C Osgood
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1935-05-14
Filing date: 1935-05-14
Publication date: 1937-09-14
Anticipated expiration: 1954-09-14

Description

Sept. 14, 1937." i R. c. osGooD HOISTING MECHANISM 1 e 2S ,|11 0. W www e .n.v p O j 4 4M www l 5%, mw Mund Y Q www@ w 4 1 .w n I llhMr .HW D0 Jl* Illu Sept. 14, 1937. R. c. ossoon HoIsTING MEcHANIsM Filed May 14, 1955 -4 sheets-sheet 2 [devenga f ysgoa Sept. 14, 1937.

R. c. cs GooD HoIsTING MECHANISM Filed May 14, 19.35 4 Sheets-Sheet 3 ganzi l l I 0 Sept. 14, 1937. R. c. osGooD HOISTING MECHANISM Filed May 14,. 1955 i? 64 v4 Sheets-Sheet 4 Patented Sept. 14, 1937 UNITED STATES 2,092,774 nors'rlNG MECHANISM Robert C. Osgood, Claremont, N. H., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application May 14, 1935l Serial No. 21,461

25 Claims.

This invention relates to hoisting mechanisms, and more particularly, but not exclusively, `to improvements in scraper mucking or so-called slushing hoists of the double drum type.

In hoisting mechanisms, particularly those of the scraper mucking or so-called slushing type, various arrangements of the control elements for the drum drive control means and drum braking means, the rope guards, and the rope guiding means for guiding the haulage ropes with respect to the drums are necessary to meet the numerous requirements of drag scraper work. Under certain conditions, as for instance in loading slide work, end control elements for the drum driving means and drum braking means are desirable, but under other conditions, side control elements are desirable. Also, the rope guards and the rope guiding means must be located in different positions to respectively guard the ropes and guide the haulage ropes with respect to the drums as the ropes are extended fromthe drums in various manners. Also, itis necessary to provide control elements which may be operated at one time from one side or end of the machine and at another time the other side or machine end, and in certain instances, the motor must be arranged at one end of the drums and in others at the other drum ends. Hitherto, to meet these varied requirements, it was necessary to provide a number of separate hoisting units each designed to meet certain requirements.

A primary object of the present invention is to provide an improved hoisting mechanism parcalled "slushing transposal and re-arrangement of parts, the various requirements above mentioned may be met by a single hoisting unit. Another object is to provide an improved hoisting mechanism having .improved control means for the drum driving I means and the drum braking means. Yet anotherobject is to provide an improved rope guiding means for the haulage ropes whereby the haulage ropes may be extended in various'manners with respect to the haulage drums. A further object is to provide an improved drum driving gearing and improved lubricating means therefor. A still further object is to provide an improved lubricating means for elements of the drum driving gearing and having embodied therein an improved lubricant seal. Still an- 'other object is 'to provide an improved transposable arrangement for the control elements and the rope guides of a hoisting mechanism of the double drum type. These and other objects and advantages of the invention will, however, hereinafter more fully appear.

In the accompanying' drawings there are shown for purposes of illustration one form and several 5 modifications which the invention may assume in practice.

In these drawings,-

Fig. 1 is a plan view of the illustrative form of' the improved hoisting mechanism. 10

Fig. 2 is a side elevational view of the hoisting mechanism shown in Fig. 1.

Fig. 3 is an end elevational view of 'the improved hoisting mechanism.

Fig. 4 is an enlarged view in longitudinal section taken substantially on line 4 4 of Fig. 1.

Fig. 5 is a cross sectional view taken on line 5-5 of Fig. 4.

Fig. 6 is a cross sectional view taken on line 5 6. 0f Fig. 4. 20

Fig. 7 is a detail sectional view taken on line '1 -1 of Fig. 1.

Fig. 8 is 'a cross sectional view taken on line 8-8 of Fig. 4.

Fig. 9 is a cross sectional view taken on line '25 9-9 of Fig. 4. I

Fig. 10 is a detail sectional view showing a portion of the drum braking structure.

Figs. 11 and 12 are detail sectional views taken on lines II-II and |2-I2 of Fig. 10. 30

Fig. 13 is a perspective View showing the rope guards and their associated rope guides.

Fig. 14 is a detail sectional view taken on line Ill-I4 of Fig. 13.

Fig. 15 is a view similar to Fig. 1 showing a 35 modied form of control means for the drum drivingand braking elements.

Fig. 16 is a side elevational view of the hoisting mechanism shown in Fig. 15.

Fig. 17 is an end elevational view of the hoisting mechanism shown in Figs. 15 and 16.

Fig. 18 is a cross sectional view taken on line |8-I8 of Fig. 16.

Fig. 19 is a cross sectional view taken on line I9-I9 of Fig. 16. p

In this illustrative construction there is shown a double Vdrum hoist generally designated H of the scraper mucking or so-called slushing type having a frame I herein in the f orm of a bottom skid having upturned ilanges and a plane bottom surface 2 for supporting the hoist, as, for instance, for slidably supporting the hoisting mechanism over the mine iioor, or for permanent association with a loading slide. The frame which herein forms the base of the hoisting mechanism has se- 55 cured thereto, as by Screws 3, upstanding end supports 4 and 5. As shown, mounted on an extension 6 of the base frame I is a motor 1 having its power shaft 8 horizontally disposed and extending longitudinally of the hoisting mechanism. Fixed to the motor power-shaft 8, as by a, key, is a motor pinion 9 herein preferably\ of the helical type, and this pinion is meshed with an internal helical gear I0 fixed, as by a key at II, to one end of a longitudinally extending horizontal driving or transmission shaft I2. The end bracket 4 is formed with a recess I3 closed at its outer side by a detachable recessed cover |4, and the recesses in the support 4 and the cover I4 cooperate to form a chamber within which the helical gears 9 and I0 are arranged, and this chamber is adapted to receive a lubricant bath for the gears. Carried by the cover plate I 4 is a lubricant seal I5 having a cup leather tightly embracing the hub of the pinion 9 for preventing leakage of lubricant from the gear chamber along the motor power shaft, and the cover I4 is preferably vertically split to permit the removal thereof without disturbing the motor power shaft and pinion. In this instance, the horizontal driving or transmission shaft I2 is arranged parallel with the axis of the motor power shaft and journaled at its opposite ends in sets of spaced alined ball bearings I6 and |'I supported respectively within the end supports 4 and 5. As illustrated, secured, as by keys I8 adjacent the opposite ends of the shaft I2, are spur pinions I9 and 20, meshing with planetary drum driver gears 2 I, 2 I, each of which is journaled on spaced alined ball bearings 22 supported by stub shafts 23, 23. These shafts are arranged in parallel relation with their axesvlying in a diametric plane including the axis of the shaft I2. The pairs of shafts 23, 23 are respectively carried by

rope winding drums

24 and 25, as for instance, a haulage drum and a tail rope drum. The shafts are arranged in longitudinal bores 26 formed in the drum bodies and extend completely through the drums in the manner shown in Fig. 4. By extending the stubshafts 23 completely through their respective winding drums, it will be evident that an extremely stable support is providedfor the planetary drum driver gears 2|, 2|. The drums 214 and 25 are arranged in coaxiai relation between the end supports 4 and 5, andare each journaled on ball bearings 21, 28 supporte@I by the transmission shaft I2. Suitably connected, as by a connection 29, to the

rope drums

24 and 25, respectively, are haulage or drag line ropes 30 and 3|. It will be noted that in this instance the gears 2|, 2| mesh with internal gears 32 and 33 arranged at the remote drum ends and suitably secured to

reaction members

34 and 35, respectively. Each of these reaction members is provided with a hub 36 journaled in a roller bearing 3l supported within the adjacent end support, these hubs 36 also forming the supports for the ball bearings I6 and II. Each of the gear portions secured to the

reaction members

34 and 35 are externally grooved at 38, and suitable brake bands 39 and 4|) cooperate with the surfaces of the bottoms of these grooves in a manner to be later described. 'Ihe adjacent drum ends are provided with braking surfaces 4| with which brake bands 42 and 43, respectively, cooperate. In accordance with this invention, the reaction members and their associated internal gear portions cooperate to form a chamber 44 within which the gears I9, 2|, 2| are arranged, and this chamber is adapted to contain a lubricant bath for the gears. To provide a lubricant seal to pre,-

vent leakage of lubricant from the chamber 44, there is secured to the gear portions of the internal gears annular flanged members 45 having their inwardly directed flanged portions 46 cooperating with annular shoulders 41 formed on the drums.

A high pressure grease lubricating system is provided for the various bearings. The adjacent ends of the drums are each provided witha passage 48 communicating witha chamber 49 receiving the ball bearing 28, and lubricant is adapted to be supplied to the passage through a usual f1tting 56. The adiacentdrum ends are also provided with passages 5| each having a fitting 52 and communicating with an annular recess 53 formed on the -shaft 23, and this recess is connected through a radial passage and an axial passage in the shaft 23 :with the chamber 54 receiving the ball bearings 22. I'he opposite ends of the drive shaft |2 are provided with

fittings

55 and 56, and

the fitting 55 is connected through an axial passage and radial passages in the shaft I2 with the chambers receiving the bearings I6 and 21. The

fitting 56 is similarly connected through axial and radial passages in the shaft I2 with the chambers receiving the ball bearings I1 and 2'|. The adjacent end faces of the drums are annularly grooved at 5l to receive a sealing ring 58 for preventing leakage of lubricant from the chambers receiving the bearings 28.l out between the drum ends. Carried by the support 4 is a tting 59 connected by a passage 60 communicating with the 'chamber receiving the roller bearing 31. while the support 5 is provided with a similar fitting 6| connected to the chamber receiving the roller bearing for the hub of the reaction member 35. '

Ihe reaction members

34 and 35 each carry a fitting 62 connected by a passage 63 with the chambers 44 for supplying lubricant to these chambers. It will thus be seen that a high pressure grease system is provided whereby the various bearings may be properly lubricated, and by the provision of the flanged retaining members 45, leakage of lubricant from the chambers 44 is substantially prevented.

Encircling the drums are

rope guards

64 and 65 for the

drums

24 and 25, respectively, closely embracing the drum fanges, each of these guards being composed of two sections vertically split at 66 and secured together by bolts 61. Each of these guards is provided with depending bottom flanges 66 cooperating with vertical flanges 69 formed on the opposite sides of the base frame, and the fianges 68 are secured to the flanges 69 by screws 10. Each of these rope guards is provided with a top opening 'II and a bottom opening 'I2 through which the ropes wound on the drums may be extended, it being evident that the ropes may be extended from the bottoms of the drums through the openings 'I2 and from thel tops of the drums through the openings 'II. With the arrangement shown in Figs. l, 2 and 3, the rope 30 of the haulage drum 24 extends from the top of the drum through the opening I| in the guard 64, while the tail rope 3| on the tail rope drum 25 extends from the bottom of the drum through the opening 'I2 in the rope guard 65. It will be evident that if desired both ropes may be extended from either the bottoms or the tops of the

drums

24, 25 simply by releasing the screws 'I0 and the bolt 6l to permit separate removal of the sections of one of the rope guards from the base frame and its associated drum, turning the rope guard into its opposite position and 'again securing the guard sections together and to the base frame so that the openings 1I, 12 may be on either side of the hoisting mechanism, or with one opening 1I on one side andthe other opening 1! on the other side. It will thus be seen that the rope guards may be placed in any desired position with respect to the hoisting drums simply by the re-arrangement of the sections thereof to bring the cable openings 1|, 12 in any desired locationwith respect to the drums.

Attached to the rope guards 64 and 65 are rope guides generally designated 13 and 14. These rope guides are preferably identical in design so that one may be readily substituted for the other,l

, secured to the guard anges by screws 88 threaded within the openings 11. The screws 88 may be removed from the threaded openings 11, the rope guide 13 detached from the rope guard, inverted and secured to the rope guard adjacent the opening 12 by the bolts 88 engaging the opening 16 in the rope guard, thereby to bring both of the rope guides adjacent the openings 12 of the guards at the bottoms of the drums. Conversely, the rope guide 14may be detached from the rope guard, inverted and attached to the rope guard adjacent the opening 1I so that both of the rope guides are arranged adjacent the openings 1| in the guards at the tops of the drums. As previously mentioned, the positions of the guards may be reversed with respect to their hoisting drums so that both of the rope guides are arranged at either the tops or the bottoms of the drums at the opposite sides of the drums, as indicated in dotted lines in Fig. 3. Each'of these rope guides 13, 14 comprises a frame 8I supporting parallel vertical shafts 82 on which are journaled vertical rollers 83 and supporting parallel horizontal shafts 84 cn which are journaled horizontal rollers 85.

The improved braking means for the drum drive control means and the drum braking means will now be described. As shown in Fig. 8, the brake band 39 has its bottom portion secured to the base frame by means of members 86 riveted to the band, and each of these members has a projecting lug (see Figs. 10, 11 and 12) 81 fitting a slot 88 formed in a block 89. This block 89 is detachably secured by a screw 98 to a bracket 9| in turn bolted to the base frame I. When it is desired to remove the brake band, it is detached from its operating connections and the blocks 89,

upon removal of the screws 98, slid outwardly to release the lugs 81 from the slots 88, thereby permitting lateral release of the brake band from its cooperating brake element. Detachably secured, as by screws 92, to the rope guards 64 and 65 are

brackets

93 and 94, and rotatably mounted in the bracket 94 is a tubular rod 95, while extending through this tubular rod and rotatably mounted in the bracket 93 is an operating rod 96. Fixed to the adjacent extremities of the

rods

95, 96 are end control levers 91 and 98, respectively. It will be evident that these

levers

91 and 98 may be arranged to extend downwardly as shown, or to extend upwardly in the opposite direction, the rod having provision for attaching The flanges the levers in either position. Fixed to the opponected to a lever 18|. The lever I8I is pivotally connected to one end of the brake band 39, while pivotally connected `at |82 to the opposite end of the brake band is an adjustable tie rod |83, in turn pivotally connected at |84 to the lever I8 I It will -be evident that when the lever |8I is swung downwardly from its position shown in Fig. 8, the ends ofthe brake band are drawn together by the connection |8I, |83. Keyed to the rod 96 at the opposite side of the bracket 93 with respect'to the lever 99 is a two-part lever |85 engaging at |88 one end of a rod |81 fixed to one end of the brake band 42, while the opposite end of the brake bandis secured by a bolt |88 to the bracket 93. Secured to the tubular rod 95 are similar levers |89 and II8 connected through similar operating connections to the

brake bands

48 and 43. It will thus be seen that when the lever 98 is operated to rotate the rod 96 in one direction, the brake band 39 is applied, while the brake band 42 ls released, and when the lever 98 is swung to turn the rod 96 in the opposite direction the brake band 42 is applied while the brake band 39 is released. The

brake bands

48 and 43 are operated in the same manner by the lever 91 for the operating rod 95. 'I'hese end control levers may be transposedv to the opposite sides of the hoisting mechanism simply `by detaching the

brackets

93, 94 from one side of'the rope guards and transferring them to the other side thereof, as indicated in dotted lines in Fig. 3, and by reversing the position of the operating connections for the brake bands. By the provision of structure whereby the operating connections may be transferred to either side of the machine, it is possible to control the hoisting drums from either side of the machine.

In the modified form of construction shown in Flgs.'15 to 19, inclusive, the control rods, vtheir operating levers and the associated control means have been sup-planted by side lever control means for the drum drive control means and foot pedal control means for the drum braking means. Also in this form of the invention the ropes are extended from the bottoms of the drums through the bottom openings 12 of the rope guards at the same side of the machine, and the rope guides 13, 14 are connected to the rope guards adjacent the bottom opening 12. The top openings 1I, when the parts are so arranged, are closed by suitable sheet metal covers, and the threaded openings in the rope guards for receiving the attaching bolts for the

end lever brackets

92, 93 have threaded therein screws I I for attaching plates ||6 to the guards for bracing the latter. As in the form of the invention shown in Figs. 1, 2 and 3, the rope guards may be reversed with respect to the drums and the rope guides 13, 14-

may be attached, if desired, adjacent the top guide openings 1I or the bottom guide openings 12, as indicated in dotted lines in Fig. 17. In this instance, the operating means for the

brake bands

39, 48 includes 'side operating members I I1 and I8, respectively, each pivotally connected at II9 to one end of the brake band and through an adjustable link |28 to the other end of the brake band so that when these side levers are swung downwardly toward the drums, the ends of the` brake band are drawn together to apply the brake. The brake bands 42, 43 of the drum brakes are operated by foot pedals 2I and |22, respectively, and each of these foot pedals is pivotally connected at |23 to the adjacent rope guard. One end of the brake band is adjustably threadedly connected at |24 to an eye bolt |25 pivotally connected at |26 to the foot pedal, while the opposite end of the brake band is connected through a member I 21, in turn connected to the pivot pin for the foot pedal. Coil springs |28 connected between each foot` pedal and a flange of the rope guard urge the foot pedals toward their released position. When the foot pedals are pressed downwardly the brake bands are tightened. As indicated in dotted lines in Fig. 17, the side operating handles ||1 and |I8 and their operating connections may be reversed with respect to the drums as also can be the foot pedals and their operating connections, so that the hoisting drums may be controlled from either side of the machine. Otherwise this form of the invention is similar to that shown in Figs. 1, 2 and 3.

The mode of operation of the improved hoisting ,mechanism will be clearly apparent from the description given. It will be noted that when the motor 'I is running, the transmission shaft I2, and consequently the drive pinions I9 and 20, are rotated, though the winding

drums

24 and 25 loosely journaled on this shaft I2 may be idle if the brake bands 39 and 4|!y controlling the

reaction members

34 and 35 are released so that the reaction members may freely rotate in their respective bearings. If it is desired to rotate the drum 24 to wind in the cable 30, the brake band 39 controlling rotation of the reaction member 34 is applied, consequently preventing rotation of the internal gear 32. The drive pinion I9 then causes the planetary gears 2li, 2l to roll around the internal gear 32 as a trackway and move with them, the winding drum 24. The winding drums 25 at that time pay out the cable 3| cooperating therewith, the reaction member 39 being freely rotatable at this time under the control of the brake band 43 which acts as a spinning" brake to prevent tooI rapid rotation of the drum, and consequently too rapid unwinding of the rope 3|. If it is desired to rotate the drum 25 and wind in the cooperating cable 3| and to pay out the cable 30 cooperating with the drum 24, the brake band 39 controlling the reaction member 34 is released, permitting rotation of the drum 2 4. The brake band 40 controlling rotation of the reaction member 35 is then applied and the internal gear 33 held stationary. the pinion 20 then causing the planetary gears 2|, 2| to roll around the internal gear 33 as a trackway and causing the drum 25 to revolve therewith. At this time the spinning brake 42 controls too rapid rotation of the drum 24. It will therefore be evident that through suitable application of the

brake bands

39 and 40 the

drums

24 and 25 may be selectively or simultaneously positively driven from the motor 1, and that when the

brake bands

39 and 49 are released, the winding

drums

24 and 25 may remain idle during running of the motor and that rotation of `the

drums

24 and 25 in a direction to pay out their respective cables may be controlled by the spinning brakes 42 and 43.

When the rope guards 54, 65 are in the position shown in Figs. l, 2 and 3, the rope on the drum 25 is extended from the bottom of the drum through the opening 'I2 in the guard 65 and is guided by the guiding means 14, while the rope 30 is extended in the opposite direction from the top of the drum 24 through the opening 1| in the guard 64 and is guided by the rope guide 13. When it is desired to extend both of the ropes 39, 3| in the same direction from the bottoms of the

drums

24 and 25, through the openings 12 in the guards 64. 65, the guide 'I3 is detached from the guard 64, inverted and reattached to the guard adjacent the opening 12 on the same side of the' hoisting mechanism as the rope guide 14. When it is desired to extend both ropes 30, 3| in the same direction from the bottoms of the

drums

24 and 25, through the openings 12 in the

guards

64, 65, the guide 'I3 is detached from the guard 64, inverted and re-attached to the guard adjacent the opening 12 on the same side of the hoisting mechanism as the rope guide 14. When it is desired to extend both ropes 30, 3| from the tops of the

drum

24, 25 through the openings 1| in the rope guards, the rope guide 14 is detached from the guard 65, inverted, and then re-attached to the guard adjacent the opening 1| at the same side of the machine as the rope guide 13. Either of the rope guards 94, 65 may be detached froml the hoisting mechanism, their position reversed the opening 12 in the guard 94, the rope guides 13, 14 being attached at these openings 1|, 12 to guide the cables when they are so extended. If it is desired to operate the control means for the hoisting drum from the opposite side of the machine the control means are detached from one side of the machine and transferred to the other side thereof. The operation of the hoisting mechanism shown in Figs. 15 to 19, inclusive, is similar to that above described, except in this instance the brake bands are controlled by side levers ||1, ||1 and foot pedals |2I, |22, and,l as in the form of the invention above described, these side levers and foot pedals may be transferred to the opposite side of the machine when desired. ,The structure of the hoisting mechanism, the rope guard and guide structure of this form of the invention is identical to the form of the invention shown in Figs. 1, 2 and 3 and may be re-arranged with respect to the hoisting drums in the same manner.

As a result of this invention, it will be noted that an improved hoisting mechanism of the scraper mucking or so-called slushing type is provided having improved interchangeable and transferable arrangements for the rope guides and the operating means for the drum drive control means and the drum braking means whereby a single hoisting unit, but by simple change in parts, may be used to meet the varying conditions encountered in scraper loading work. It will further be noted that an improved hoisting mechanism is provided having improved drum drivingmeans, improved control means and improved lubricating means for the drum driving means, the improved lubricating means embodying an improved lubricant seal for certain elements of the drum driving gearing. It will further be evident that by the provision of the improved rope guards and rope guiding means and the transposable arrangement of the control levers, the hoisting mechanism may operate either as a right hand or left hand machine, the motor may be rotated in either of opposite directions and the ropes may be extended from the drums in various manners. These andother uses and advantages of the improved hoisting mechanism will be clearly apparent to those skilled in the art.

While I have in this application specifically described one form which my invention may assume in practice, and certain modifications thereof, it will be understood that this form of the same is shown for purposes of illustration, and that the invention may be further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and ,desire to secure by Letters Patent is:

1. In a hoisting mechanism, a frame, a rope drum rotatably mounted rori said frame, and a rope guard mounted on said frame and at least partially surrounding said drum, said guard having lateral openings respectively on one side thereof near the top of said drum and on the other side thereof near the bottom of said drum whereby the free end of a rope wound upon the drum may be extended from the top of said drum through one opening and from the bottom of said drum through the other opening.

2. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, a rope guard mounted on said frame and at least partially surrounding said drum, said guard having openings respectively on one side thereof near the top of said drum and on the other side thereof near the bottom of said drum whereby a rope may be extended from the top of said drum through one opening and from the bottom of said drum through the other opening, and a rope guide attachable to said guard adjacent either of said openings for guiding the rope when extended through either opening.

3. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, and a rope guard mounted on said frame and at least partially surrounding said drum, said guard having openings respectively on one side thereof near the top of said drum and on the other side thereof near the bottom of said drum whereby a rope may be extended from the top of said drum through one openingand from the bottom of said drum through the other opening, said rope guard being reversible in position with `respect to said drum so that said openings may be located at either sideof said drum.

4. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, a rope guard mounted on said frame and at least partially surrounding said drum, said guard having openings respectively on one side thereof near the top of said drum and on the other side thereof near the bottom of said drum whereby a rope may be extended from the top of said drum through one opening and from the -bottom of said drum through the other opening, said rope guard being reversible in position with respect to said drum so that said openings may be i-- 'cated at either side of said drum, and a rope guide attachable to said guardvadjacent either of said openings for guiding the rope when extended selectively through either opening in either position of said guard.

5. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, and a rope guard `mounted on said frame and at least partially surrounding said drum, said guard being made in two parts bolted together, one part having an opening near the top of said drum and the other .part having an opening near the bottom of said drum whereby a rope may be extended from the top of the drum through one opening and from the bottom of said drum through the other opening.

.6. In a hoisting mechanism, a frame, la rope drum rotatably mounted on said frame, and a' rope guard mounted on said frame and at least partially surrounding said drum, said guard being made in two parts bolted together, Vone part having an opening near the top of said drum and the other part having an opening near the bottom of said drum whereby a rope may be extended from the top of the drum through one opening and from the bottom of said drum through the other opening, and a rope guide attachable to either part of said guard adjacent either of said openings for guiding the rope when extended through either opening.

7. In a hoisting mechanism, a frame, relative;

ly rotatable rope drums mounted on said frame, and a pair of rope guards, one for each drum, mounted on said frame and encircling said drums respectively, each of said guards having an opening at one side thereof near the top of the drum and an opening at the other side thereof near the bottom of the drum whereby ropes may be extended from the top of either drum through the top openings and from the bottom of either drum through the bottom openings, and a pair of rope guides, one for each guard, and attachable to each guard near either opening thereof for guiding the rope whenv extended through either opening.

8. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, a rope guard mounted on said frame and at least partially surrounding said drum and having an opening. through which the rope may be extended from said drum, drum driving means, drum braking means, and control means for said drum driving means and said drum braking means including control elements mounted on said guard, said control elements being 'transposable to either sideof said guard whereby the drum may be controlled from either side thereof.

9. In a hoisting mechanism, a frame, relatively rotatable rope drums mounted on said frame, and a pairof rope guards, one for each drum, mounted on said frame and surrounding said drums, respectively, .each of said guards having an opening at one side near the top of its drum and on the other side near the bottom of its drum whereby the ropes may be extended from the`tops of said drums through the top openings and from the bottoms of said drums through the bottom openings.

10.v In a hoisting mechanism, a frame, relatively rotatable rope drums mounted on said frame, and a pair of rope guards, onel for each drum, mounted on saidy frame and surrounding said drums, respectively, each of said guards having an opening at one side near the top of its drum and on the other side near the bottom of its drum whereby the ropes may be extended from the tops of said drums through the top open`- ings and from the bottoms of' said drums through the bottom openings, said guards being detach- Aable from said frame for reversal in position mounted on said frame and surrounding said drums, respectively, each of said guards having an opening at one side near the top of` its drum and on the other side near the bottom of its `drum whereby the ropes may be extended from the tops of said drums through the ltopopenings and from the bottoms of said drums through the bottom openings, and a pair of rope guides, one for each guard attachable to its guard adjacent either of said guard openings for guiding the tops of said drums through the top openings and from the bottoms of said drums through the bottom openings, said guards being detachable from said frame for reversal in position with respect to their drums whereby the ropes may be extended from the drums from either side thereof, and a pair of rope guides, one for each guard, attachable to its guard adjacent either of said guard openings fon` guiding the ropes when, extended through either of said guard openings.

13. In a hoisting mechanism which comprises a guarded drum, a drum guard comprising a cylindrical member encircling the drum and having opposed lateral rope openings, one near the top thereof and the other near the bottom whereby a rope wound on the drum may be extended laterally from the top of the drum through the top opening and from the bottom of the drum through the bottom opening.

14. In a hoisting mechanism which comprises a guarded drum, a drum guard comprising a cylindrical member encircling the drum and having opposed lateral rope openings, one near the top thereof and the other near the bottom whereby a rope wound on the drum maybe extended laterally from thetop of the drum through the topopening and from the bottom of the drum through the bottom opening and having means adjacent either opening adapted for the attachment of rope guiding means.

15. In a hoisting mechanism which comprises a guarded drum, a rope drum guard comprising a circular guard member encircling the drum and composed of two identical parts bolted together,.

one part having a rope opening near the top thereof and the other having a rope opening at its bottom whereby a rope may be extended from the drum guarded thereby in one direction through one opening and in the opposite direction through the other opening.

16. In a hoisting mechanism, aframe, a rope drum rotatably mounted on said frame. a motor on said frame, drum supporting means on said frame comprising an end support, driving gearing connecting said motor to said drum, said supporting means having a recess extending inwardly from the outer surface of said end support, a cover attached to the outer surface of said support and having a recess cooperating with said recess to form a lubricant chamber for elements of said gearing, said gearing elements having portions arranged in said end support recess.

17. In a hoisting mechanism, a frame, a rope drum journaled on said frame, a motor on said frame, drum driving means including a reaction member, an internal gear secured to said reaction member, a driving gear, a gear carried by the drum and meshing with said driving gear and said internal gear, said reaction member and internal gear providing a lubricant chamber in 75 which said gears are arranged, and a member secured to said reaction member and having an inwardly directed annular portion cooperating with said drum for providing a lubricant seal.`

18. In a hoisting mechanism, a frame, a rope drum journaled on said frame and having an annular shoulder, a motor on said frame, drum driving means including a reaction member, an internal gear secured to said reaction member, a driving gear, a gear carried by the drum and meshing with said driving gear and said internal gear, said reaction member and internal gear providing a lubricant chamber in which said gears are arranged, and an annular member secured to said reaction member and having an inwardly directed annular flange cooperating with the annular shoulder on said drum for providing a lubricant seal.

19. In a hoisting mechanism, a frame, a rope drum journaled on said frame, a motor on said frame, drum driving means including a reaction member, an internalgear secured to said reaction member, a driving gear, a gear carried by the drum and meshing with said driving gear and said internal gear, said reaction member and internal gear providing a lubricant chamber in which said gears are arranged, and a member secured to said reaction member and having an inwardly directed annular portion cooperating with said drum for providing a lubricant seal, said annular portion providing an inner end wall for said lubricant chamber.

20. In a hoisting mechanism, a frame, a rope drum journaled on said frame and having an annular shoulder, a motor on said frame, drum driving means including a reaction member, an internal gear secured to said reaction member, a driving gear, a gear carried by the drum and meshing with said driving gear and said internal gear, said reaction member and internal gear providing a lubricant chamber in which said gears are arranged, and an annular'member secured to said reaction member and having an inwardly directed annular ange cooperating with the annular shoulder on said drum for providing a lubricant seal, said annular ange providing an inner end wall for said lubricant chamber.

21. In a hoisting mechanism, a frame, a rope drum journaled on said frame, drum driving means including a reaction member, an internal gear secured to said reaction member, a driving gear, a gear carried by said drum and meshing with said driving gear and said internal gear, said reaction member and internal gear providing a lubricant chamber in `which said gears are arranged,.and a member secured to said reaction member and having an annular flange forming a wall of said lubricant chamber and at its inner periphery cooperating with a cylindrical surface on said drum for providing a lubricant seal.

22. In a hoisting mechanism, a frame, a rope drum journaled on said frame and having an annular shoulder formed on a cylindrical portion of the drum, drum driving means including a reaction member, an internal gear secured to said reaction member, a driving gear, a gear carried by said drum and meshing with said driving gear and said internal gear, said reactionmember and internal gear providing a lubricant chamber in which said gears are arranged, and an annular member secured to said reaction member and having an annular iiange forming a wall of said lubricant chamber and at its inner periphery cooperating with said annular shoulder on said drum for providing a lubricant seal.

23. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, and a rope guard mounted on said frame and at least partially surrounding said drum, said guard having lateral openings, one opening through one side of said guard near the top of said drum and the other opening through the other side of said guard near the bottom of said drum. whereby the free end of a rope wound upon the drum may be extended from the top of the drum through one opening and from the bottom of the drum through the other opening, said frame having attaching means at its opposite sides for attaching said guard thereto, and said guard having depending bottom anges at its opposite sides and secured to the opposite sides of said frame by said attaching means.

24. In a hoisting mechanism, a frame, a rope drum rotatably mounted on said frame, a rope ,guard mounted on said frame and at least partially surrounding said drum, said guard having lateral openings', one opening through one side of said guard near the top of vsaid drum and the other opening through the other side of said guard near the bottom of said drum whereby the free end of a rope wound upon the drum may be extended from the top of the drum through one opening and from the bottom of the drum through the other opening, said guard having attaching means adjacent each rope opening for attaching a rope guide thereto, and a rope guide attachable to said guard by said attaching means adjacent either of said openings for guiding the rope when extended through either opening.

25. An article of manufacture, for use in a hoisting mechanism having a guarded drum, comprising a drum guard at least partially surrounding the drum when incorporated in the hoisting mechanism and having opposed lateral rope open,- ings, one opening near the top of the guard and the other near the bottom thereof whereby a. rope Wound on the drum may be extended laterally from the top of the drum through one opening and from the bottom of the drum through -the other opening, and attaching means on said guard adjacent each rope opening for a rope guide.

ROBERT C. OSGOOD.