US1429930A - Snubbing machine - Google Patents

Description

H. C. CURRIER. SNUBBING MACHIN.

APPLICATION man Nome. 192s.

-Patenczed Sept. 26

1922, 6 SHEETS-SHEET 1.

.INVENTOR jf. 6'. Currier BY 64./ /f/ 1'/ ATTORNE y H. C. CURRIER.

SNUBBING MACHINE.

APPLICATION FILED Nov.26. 1921.

nuns-SHEET s.

Patented Sept. 26

HW AR ATTORNEY H. C. CURRIER.

SNUBBING MACHINE.

APPLICATION FILED Nov. 26, l1921.

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WL R@ M `Pri O w ma Wn H. C. CURRLER.

SNUBBING MACHINE.

APPLICATION FILED Nov.26,1921.

Patntedept 26, 1922.

IAQIQI vINvIaN'roR 7. 6. 'urfzfef Patented Sept. 216, i922,

NETE

HENRY CUR/HIER, OF MILLERS FALLS, IVIASSACHUSETTS. l

suoniamo MACHINE.

Application led November 2G, 1921. Serial No. 517,878.

'ol machines shown in my Letters Patent No. 1,273,7-15`issued July 28, 1918.

The present invention has'lor its objects to provide a simply constructed machine of the character whereby the movement of a cable for snubbing logs on an inclined plane is controlled; to provide a snubbing machine having a series of drums and pulleys-upon which a snubbing` cable is threaded whereby the cable is controlled; to providey in a snub-y bing machine, a series of drums and a series oi pulleys mounted upon an inclined support, whereby the snubbing cable is guided upon said drums; to provide, in a snubbing machine, a pair of drums over which the snubbing cable operates and means for braking one oi said drums and releasing 'the other drum automatically and vice versa; to provide, in a snubbing machine, a drum shaft and means for controlling the rotation of said shaft; and to provide, in one embodi-y ment of my invention, ameans :tor manually operating the machine.

The invention in its more detailed nature also resides in thoseinovel features ol construction. combination and arrangement ot parts, all of which will be first iully described and then be specifically pointed out in the appended claims, reference being had to the accompanying. drawings, in which:

'Figure 1 is' a side elevation oi' the pre-y ferred embodiment of my invention.

Figure 2 is a top plan vieu7 ot the same. Figure 3 is a iront elevation thereof. Figure is a rear elevation thereof. y Figure 5 is a cross section on the line zm o'2 Figure 2.

Figure G is a top plan view ofl another embodiment of the invention.

lfligure Y is a side elevation, on a reduced scale,oi` the mechanism shown in Figure G.

Figure 8 is a front ele ration of the meeh-y anism shown in Figure 7.

Figure 9 is ay cross section on the line 9,*9

voi Figure 7.

Figure 10 is arear elevation of the con'- struction shown in Figure 7. y y

In the drawings in which like numerals of reference designate like parts in all of the figures, 1 represents the longitudinal beams el? the sled Which carries the mechanism,

the beams 1 having skids 2 andl being connected together by cross beams 29 andat.

A bail 3 is provided for towing purposes and f also to serve as a convenienty means or"y connection Wiith a suitable anchorage. y

Mounted in a suitable bearing 4l on the beams 1 is a drum shaft 5 on Which is 'mounted a cabledrum 6 having a plurality of cable receiving grooves and having a,y

brake disk 7 around which the brake band 21-,22 passes. y

A rod S is held in a bearing 9 and a guide 10 and` is secured to link plates 13 Which have a series of holes for purposes of adjustably connecting the same to the treadle or foot-lever 12. The lever 12 is mounted on the rod 11 and the plates 13 are secured to the lever by bolts land nuts L1.

`A guide 1G with a strap 17 having key or piu holes 18 'tor a holding pin 19 serves to holdy the lever 12 in any one of a series of positions whereby ldifferent degrees of braking stress may be applied to the brake disk 7 of the drum; the lever has a loop 20 to serve as a foot guard or as a handle as may be desired.

rlhe brake band consists of two sectionsr 214-22.A the former being secured to therod 8 at one of its ends and the latter being secured at its corresponding end to the rod 11, the two brake band sections being-connected by bolts and nuts -26 respectively to one another through the use of link plates 23 having a series of holes 24 for purposes of ad]ustment and taking up Wear.

Mounted on a steppedshaft 2,7.28 are a number of pulleys 31 over which and around the drum 6 'the cable passes, the shaft 27 being braced by eyebolts beam 29.` n i yStandaids 32-32 are sustained on the cross beams 3l and are united, at their tops, by a cross beam thereby constituting a 'traine to sustain the front or tension drums and the devices fory pressing vthe cable onthe 30 from thecross n same, i. egtor braking the drums alternately. i

lllounted in bearinds on the standards 32 (D r are shafts 36 for the two grooved drums 37,

each oi" which drums has a brake hub 38, see Figure 5, by reference to which it will also be observed that I provide two U- iirames 39 having slots -LO through which lag screws 4l pass to hold the U-i'rames vertically slidable on the standards 32. The U- frames are normally held down under spring tension by rods 42 which are connected at 43 to the U-frames 39, pass through guide openings Llil in the beam 33 and through holes `l5 in a bar 4G, ther latter being adjustable on bolts 47 through the medium ot' nuts i9 so as to varyv the tension on the springs 48 which are interposed between the bar -LG and the attachment 43. The springs 4S tend to hold the U-iranies 39 downwardly to thereby hold the rollers 50 in the grooves of the drums 37 and in contact with the cable 75 for. a purpose presently understood.y

The rollers() are each mounted on a sha'it 51 journaled in bearings in the U-fra-mes 39. By adjusting the nuts 49 up or down, the normal tension ofthe springs 48 can be adjusted.

This construction just described allows the rollers 50 to rise when knots or splices in the cables pass between. rollers 50 and the drums 37.

52 designate brake bands, one end of each of which is held aroundthe shafts 5l as at and the other end 54 is carried by rods 55 which pass through slots 56 in the cross beam 33 and are pivoted at 57 to a lever 5S which is tulcrumed at 59 on a bolt G0. The bolt G0 passes into the beam 33 in which it is guided and a spring 61. serves to thrust the bolt 60 up to thereby hold the lever 5S with its tulcrum 59 in position. The lever 58 passes through a guide 62 having pin holes 63 through which a stop or holding, pin 6% (see Figure l) maybe passed to maintain the lever in its tilted positions.

At the. front of the machine are horizontal guide rolls 65 and vertical guide rolls 66 suitably mounted to guide the cable to the drums 37. i

In the embodiment of my invention just described, the cable passes over one of the guide rolls G5, thence between a pair ot' guide rolls 66, thence around a drum 37, thence alternately around the grooves of the drum G and the pulleys 3l and back over the second drum 37 and thence between the second pair of guide rolls 66 and over the second horizontal guide roll 65.

In Figures G to 9', inclusive, I have shown another embodiment of my invention. In those figures the parts having the same 'tunetion and being of the same general construction as corresponding parts in the preceding figures7 bear the same reference number plus the index letter .X. In thisv form of the invention, the brake bands 52X have one end fastened to a rod 67 from which they pass up over the hubs 68 of the rollers 60X,

thence down around the brake hubs 38X, the other ends being secured to the rods 55X. The lever 58X also is held by an upper spring 6l and a lower spring G12 it having its tulcrum on rods GOX between the two springs G8 and 61X. In this form also two drums (3X-(3X are employed as in my patent before referred to.` Each drum has grooved brake disks 7X around which the brake band 21- is passed, the band 21X having its end anchored at (3E) and being drawn taut to apply friction whenever lever 12X is pushed down by pressure of rod 8X on the band 21X between the two disks 7 X.

Provision may also be made 'tor operating the drums 6X by hand, it desired. This can be accomplished by providing one oit them with a gear 70 and providing a pinion 7 2 on a sliding crank shatt 71 (slidable endwise in bearings 73) so as to mesh or unmesh the gears TO-72.y on stub shafts' 74 on a stepped support 2T- In this form of the invention the cable is threaded between a pair of horizontal guide rolls (35X, then between a pair et vertical guide rolls 66X. around one of the drums 37X, then wound alternately over the drums 6"- GX, everyT other pass ot the cable aroiind the right hand drum 6X being continued around one of the pulleys 31X as best shown .in Figure 6, the cable continuing from the lett hand drum 6X over the other drum 37X, thence between the adjacent pair ot vertical guide rolls 66X and thence between the other pair ol. horizontal guide i'olls 65X.

Referring again to the preferred embodiment ot my invention (Figures l to 5, inelusive) it will be seen that in order to lower a heavy load down a steep incline, the machine being anchored at the top et a steep pitch or hill.y through the bail 3 the load is applied to either end of the cable 75 at the front oit the machine. This portion or side of the cable then becomes what I shall hereinafter term the tight cable. The opposite end of the cable. I shall hereafter terni the "slack cable as it is slack except tor its own weight. 'lhe operator. with the lever 5S, applies tension to the bar under leverage with a fulcrum at to tighten the friction belt, strap or band tending to retard the movement ot the sheave 37 at the side on which the slack cable lies, by friction over the brake hub 38. As the shait 3G is not movable up and down, the tension on the brake band 52 tends to draw the roller 50 and drum 37 together. j

The load is started down the hill, althe tight cable is d awn over idle roll G5 between guide rolls GG and over the adjacent sheave or drum 37. coming trom the groo'ved drum 6, the speed of revolution of which drum G is controlled by the operator throl'lgh the brake lever 12 and the brake 2l-22- The tight cable passing around the grooves The pulleys 3l* are mounted of the drum 6 and over idle sheaves 3l comes from between the sheave or drum. and roller 50 on the slack cable side, the aforesaid operation of the brake 5201i the ,slack cable side (the brake 52 .on the outgoing or tight cable side being released) causing the cable to be retarded by friction over the sheavesor drums 37, thereby'niaintaining Aa constant tension in the Wraps and turns of the cable around the drinn 6. -'llhe sheaves 3l are termed sloping sheaves and are mounted to effect a smooth transfer ofthe cable between the grooves ofthe drum-6. The drums 6 are provided with groovesfso as to separate the turns of the cable to prevent binding or tangling. The tight cable;7 descending with a load, h auls vthe slack cale up the hill Where it takes the next load and thereby becomes a tight cable, etc.`

is the operation of ,the second embodi-y ment of my invention illustrated in Figures 6 et seq. is'quite similar to that of the firstL embodiment of the invention described, a detailed description of the operation' ofthe second embodimentis believed to be iinnecessaryvand While I have disclosed two einbodiments of my invention, nevertheless Wish it understood that'otlier modincations of the sai/ne may be made Without departing from the spirit of the invention or thescope ofthe appendedelaiins. f ,f My present application is, as to all subject matter in common, a continuation of my application Serial No. 436,751.6 filed January l2', 1921, andthrough it a continuation of my application Serial No. 269,715, filed l anuary 4, 1919.

From the foregoing description, taken in connection with the accompanying draw'- ings, it is thought the complete construction,

operation and advantages of my invention Will be readily understood by those skilled in the art. f

What l claim is: c

l. In snubbing machine, drums over ivhicli a cable .is passed, pressure rollers adapted to bear upon said cable-as it passes over said drums, yokes carrying said rollers,

said yokes being spring pressed, means for,

regulating-,the tension ofsaid springs, shafts carried by said yokes'on Which said pressure rollers ,are mounted, brake bands looped over said shafts, brake drums fixed toy said.

first mentioned drums,- said brake bands passing around said drums, and means for alternately tightening one brake band and loosening the other. f v 2. ln a siiubbing machine, drums' over which a cable is passed, pressure rollers adapted to bear upon said cable as it passes over said drums, yolres carrying said rollers,

said yokcs being spring pressed,nieans for,

regulating the tensionof said spiiiigs, yshafts carried by said yokes on which said pressure rollers are mounted, brake bands looped over said shafts, brakek druinsiixed tosaid lirst ymentioned drums, said brake r bands passing around said drums, means fory alter-l nately tightening one brake band and loosening the other, saidmeans including rods to Which saidbra'lre bands are connected and a lever to Which said rods are connected.

.3. ln a snubbing machine, drums over which a cable is passed,- vpressure rollers adaptedto bear uponisaid cable as it passes over said drums, yolres carrying saidrollers, said yokes being spring pressed, means for regulatingthe tension of saidsprings, shafts carried Vby said yoles upon which said pressure rollers are mounted, brake bands looped over said shafts, brake :drums iixedito said first mentioned" drums, said brake bands passing around saidl drums, ymeans for alter-r4 nately tightening one brake band and loosening the other, said means includingrods `to Which said brake bands are connected and a lever to Which said rods are connected and compression springs over. which said lever is mounted. f 'f f 4. ln a snubbing machine, drums over Which a cable is Wound, pressure rollers adapted to bear upon said'eablel as it passes over said drums, yokes carrying'said rollers,

said yokes being springy pressed, means for regulating the tension of saidV springs, shafts carried by said yokes' upon which said pressure rollers `are mounted, brake bands looped overl saidr shafts, brake drums fixed to said first mentioned drums, said brake bands passing aroundsaid brake drunis,.means,for alternately tightening onebralze'band' and loosening the other, said means including rods tov which said `brake bands are connected and a lever to'which said rods are connected, compression springs over'which said lever is mounted and means whereby the freeends of said levers maybe held raised oi lowered'. i i f 5.111 a sniibbing machine, friction driiiins, brake druinsvfor saidy friction drums and means for simultaneously braking one drum andreleasing another, said `drums having grooves, said means i'foilnpiising friction rollers operatingin said grooves andbralie bandsv operating over said brake drunis and Cil 7. In a snubbing machine, friction drums,

brake drums for said friction drums, means for simultaneously braking one drum and releasing another, said ydrums having grooves and friction rollers operating in saidgrooves, said means consisting of brake bands operating over said brake .dr-ums, vertically movable rods for operating said bands, a pivotally mounted rcross arm to which said rods .are connected, said cross arm having` an extensionto form an operating lever, and a cable threaded over said drums over whichsaid rollers operate.

8. In a snubbing machine, friction drums and means for simultaneously braking one drum and releasing another, saiddrums having grooves, friction rollers operatingiin said grooves, said means consisting of brake bands, movable rods for operating said bands, a pivotally mounted cross: arnrto which said rods are connected, said cross arm having an extension to form an operating lever, a cable threaded over said'. drums over which said rollers operate, guide rollers between which opposing ends ot said cable pass, a guide itor said cross arm extension and means cooperative with said guide whereby said cross armniay be held in any one of a number of positions.

9. ln a snubbing machine, a plurality ot sets of drums, a plurality ot pulleys, a cable threaded around the rdrums land pulleys, means for supporting said pulleys in inclined positions relative to said drums and friction rollers acting directly on and in cooperation with certain of said drums to Form a combined braking and releasing means.

1.0. In a snubbing machine wherein is provided a `frame, main brake drums and sheaves over which a cable is threaded and wherein is'provided means for applying a braking force to said main drum to retard the progress of the cable; a cable guiding and tension means through which the entering and leaving ends of the cable" are threaded, said guiding and tension means comprising a support, auxiliary drums on said suppoitoverwhich the cable ends pass, sliding frames on the support, pressure rollers carried by said sliding frames and adapted to hold the cable in contact with the respective auxiliary drums,.means for yieldingly holding said rollers towards their. respective drums, and guide rollers for the outgoing and incoming ends of the cable.

il; ln a snubbmg machine wherein is pro-I vided a trame, main brake drums and sheaves over which a cable is threaded and wherein is provided means for applying a braking force tosaid main rdrum to retard the progress of the cable; a cable guiding and tension means through which the entering and leaving ends of the cable are threaded, said guiding and tension means comprising a support, auxiliary drums on said support over which the cable ends pass, sliding Ytrames on the support, pressure rollers carried by said sliding iframes and adapted to hold the cable in contact with the respective auxiliary drums, means itor yieldingly holding said rollers towards their respective drums, guide rollers Ylor the outgoing and incoming ends ot the cable, said holding means comprising brake bands, one end o't each of which is connected with its respective sliding frame and devices around the brake drums carried by said auxiliary drum, and a yieldably mounted lever device connected with said brake bands for drawing the same taut.

12. ln a snubbing machine wherein is provided a frame, main brake drums and sheaves over which a cable is' threaded and wherein is provided means 'tor applying a braking force to said main drum to retard the progress ot the cable; a cable guiding and tension means through which the enter` ing and leaving ends oi the cable are threaded, said guiding and tension means coinprising a support, auxiliary drums on said support over which the cable ends pass, sliding 'trames on the support, pressure rollers carried by said sliding trames and adapted to hold the cable in contact with the respective auxiliary drums, means 'for yieldingly holding said rollers towards their respective drums, guide rollers Ytor the outgoing and incoming ends ofjthe cable, said holding .means comprising brake bands, one endet each ol' which is connected with its respective sliding` frame and devices aronini the brake drums carried by said auxiliary drum, .and a yieldably mounted lever device connected with said brake bands Yfor drawing the same taut, said lever device having provision for loosening yone brake band while simultaneously tightening the other for the purposes described.

13. In a snnbl'iing machine wherein is provided main drums and sheaves over which a cable is wound and devices lor governing the movement et' the cable over said drums and sheaves; oit means 'lor holding` the cable taut on said drums and sheaves` said means comprising a trame, auxiliarjyf drums relatively fixedly mounted on said 'trame over which the incoming and outgoing ends o't the cable pass, yokes slidably mounted on said frame, rollers mounted on sha'tts in bearings carried by sai-d yokes, there being` a roller for each auxiliary drum, said cable passing over said auxiliary drums and being pressed by said rollers, means continuously tending to press said rollers against their respective drums and other means Yfor applying torce to said rollers to force them against their respective drums.

14. ln a snubbing machine wherein is provided main drums and sheaves over which a cable is wound and devices for governing the movement of the cable over said drums and sheaves; ol means for holding the cable taut on said drums sheavesJ said means comprising a frame, auxiliary drums relatively lixedly mounted on said :trame over Which the incon'iing and outgoing ends of the cable pass7 yolies slidably mounted on said trame, rollers mounted on shafts in bearings carried by said yolies, there bein'ga roller for each auxiliary drum, said cable passing' over said axiliary drums and being pressed by said rollers,`mea`ns continuously tending to press said rollers against theirrespective drums and other means il'or applying torce to saidr rollers to Vtorce them against their respective drums,a said continuously tending means comprising spring elements acting on said yolres.

l 5. ln a snubbing` machine ivherein is provided main drums and sheaves overwhich a cable is Wound and devices for governing the movement of the cable over said drums and sheaves; of ine'ans for holding the cable taut on said drums and sheaves., said means comprising a trama-'auxiliary drums relatively lixedly mounted on said frame over which the'incoining and outgoing ends of the cable pass, yolres slidably mounted on said -v frame, rollers mounted on `shafts in bearings carried by said yolres,"there being a roller for each auxiliary drum,` said cable 'passing over saidauxiliary drums and benamed means comprising brake drums car-` ing pressed by said rollersj means continuously tending to press said rollers against their respective drumsfother means Jfor ap plying force to saidrollers to force them against their respective' drums,"said last ricd by said auxiliary drums, bralre bands connected with said sliding'yolres and passl :ing around said auxiliary drum brake said drums and sheaves; of means for liolding the cable taut on said drums andsheaves, said .means comprising a'rframe,y auxiliary drums relatively lixedly mounted on said frame over which the incoming and outgoing ends oit the cable pass, yolies slideH bly mounted on said trame, rollers mounted `on shafts in bearings carried by said yokes,

there being a rollerv for each auxiliary drum,

said cable passing over said auxiliary 'drums and being pressed by said rollers, lmeans continuously tending to press*y said rollers x against their respective drums, other means for applying force 'to said rollers to force them against their respective drums7V sai'l last named means comprising brake drums carried by said auxiliary drums, brake bandsy `connected With said sliding yokes and passing around said auxiliary drum brake drums, a rocking lever to either side oi the :lfiilcrum of which the respective brake bands are connectedy whereby When said lever is rocked said sliding trames with their rollers drill be alternately moved to bring their rollers into forcible engagement with their respective drums, and a yielding fulcium for said lever. i

17. ln `a snubbing machine wherein is provided main drums and sheaves over which a'cable isf Wound and devices .tor `governing the movement of the cable ove;l said drums and sheaves; of means :for hold ing the cable taut on said drums'and sheaves,

said *means comprising a frame, `auxiliary drums relativelyxedly Umounted 'on said trame over 1'.'ihich the incoming and outgo-f *ing ends oli' the cable pass, yolres slidably mounted on said `frame, rollers mounted on shafts in bearings carried by said yolres`v there being aroller for each auxiliary drum',

said kcable passing over said auxiliaryr drums and being pressedbyl'said rollers, ineanscontinuously tending tofpress said rollers against their respective drums, other meansv for applying force to said rollersv to `torcey them against their respective drums, said i continuously` tending means compris-k inr s rin@ elements actin@ on said okes. D C' i D I `said last named means comprising brake drums carried by said auxiliary drums,

brake bands connected With "said vsliding y yolres and passing, around said auxiliary drum lbrake drums, and a rocking lever to eitherside ol the tulcrum of which `the respeetive braliebands are connected,fwherebj,T

when saidlever is rocked, said sliding trames Withtheir rollers Will be alternately moved to `bring their rollers into OreibleengageinentWith their respective drums.

18.` ln a snubbing machine,L a frame, means for janchoringsaid frame, a inainlcable drum Journaled in bearings on said trame,k said main vcable drums having a series of grooves to receive the cableyinclined guide sheavestor directing the cabletrom one groove of the drum `to* another, a cable Wound oversaid drum and sheaves with ,its ends extending in the same general direction, a lever operating brake devicey co! operative With said drunit'o govern the .movement ofthe cable, and acabletensioir ing mechanism' cooperative l.with said ldruni and Vsheaves and comprising a sub-frame, a pair of auxiliary drums Journaled in relatively fixed bearings "on saidl sub-frame, i

therel being one auxiliary drumor the in# off the cable, each of said drums having "eomingfside and onefor theoutgoing side y shafts journaled in bearings in said yoke frames, there being one pressure roller Yfor each auxiliary drum, vertical and horizontal sets of guide rolls in advance of said auxiliary frame over which and between which the ,incoming and outgoing sides of the cable pass, and means cooperative with said yoke frames ior forcing one roller towardsits respectiveydrum while simultaneously releasing 4pressure on the other roller substantially as shown and described.

19. In a snubbing machine, a trame, means for anchoring said traine,A a main cable drum journaled in bearings on said frame, said main cable drums having a series oit grooves to reeeivetlie cable, inclined guide sheaves for directing the cableifroin one groove of the drum to another, a cable wound over said drum and sheaves with its ends extending in the saine general direction, a lever operating brake device cooperative with said diuin to govern the movement ot rthe cable, and a cable tensioning mechanism cooperative with said drum and sheaves and comprisinga sub-iframe, a Apair of auxiliary 'drums yournaled'in relatively'lixed bearings on said sub-trame, tlierebeing one auxiliary drum for the incoming side and one forl the outgoing side ot' the cable, each of said drinns having brake drumelements movable with the same, a pair ofyoke viframes slidably mounted on said sub-frame, aressiirerolleis having yshafts journaled in bearings in said` yoke trames, there being one pressure roller for eaclirauxiliary drum, vertical and horizontal sets of guide rolls in advance of said `auxiliary 'frame over which and between which the incomingand outgoing sides of the cable pass, and yieldable means `iter alternately pressing- Vone roller towards its -shatt while simultaneously releasing pressure on the other roller and vice versa.

20. ln a snubbing machine, a frame, means for anchoring said frame, a main cable drum journaled in `bearings on said frame,

said Vmain cable drums having a series of grooves to receive the cable, inclinedguide vsheaves for directing the cable from one groove oit the drum to another, a cable lwound over said drum and sheaves with its ends extendingr in the same general direction` a lever operating brake device cooperative with said drum to govern the movementA of the cable, and a cable .tensioning vmechanism cooperative with said drum and sheaves and comprising a sub-"frame, a vpair of auxiliary drums ]ournaled in relatively iixed bearings on said sub-trame, there being `4one auxiliary drumfor the incoming side `and one -or the outgoing side of the cable.

'cachot-said drumshaving brake drum elements movable with ithe same,.a pair of yoke aseo trames slidably mounted on said sub-frame, pressure rollers having shafts journaled in bearings in said yoke trames, there being one pressure roller ttor each auxiliary drum, if'eitical and horizontal sets of guide rolls iii advance of said auxiliary frame over which and between which the incoming and outgoing sides oi' the cable pass, means cooperative with said yoke frames vfor forcing one yroller towards its respective drum while simultaneously releasing pressure on the other roller, and other means ttor applying a normal pressure to said yoke trames to thereby .maintain their respective rollers in working relation to their respective drums.

Il. ln a snubbing` machine, a traine, ineans for anchoring said frame, a main cable drinn iouiiialed iii bearings ou said iframe, said inain cable drums having a series of grooves to receive the cable, inclined guide sheaves tor directing the cable from one groove of the drum to another, a cable wound over said drum and sheaves with its ends extending in the same general direction` a lever operating brake device cooperative with said drum to govern the movement of the cable, and a cable tensioning mechanism cooperative with said'drum and sheaves and comprising a sub-frame, a pair ot auxiliary drums journaled in relatively fixed bearings on said sub-frame, there being oneauxiliary drum for the incoming side and `one for the outgoing sideof the cable, each of said drums having brake druinfelements movable with the saine, .a pair of yoke trames slidablyimounted on said sub-frame, pressure rollers having shafts journaled in bearings in said yoke frames, there being one pressure roller for each auxiliary drum, vertical and horizontal sets of guide rolls in advance or said auxiliary `frame over which and between which. the ,incoming and outgoing sides of the cable pass, yieldable means for alternately pressing one roller towards its shaft while simultaneously rclleasing pressure on the other roller and vice versa, and other means for applying a normal. pressure to said -yoke frames to thereby `maintain their respective rollers in working relation to their respective drums.

22. In asnubbing machine, a frame, means for anchoring said frame, a main cable druinfjournaled in bearings on said iframe, said maincable drums having a series of grooves to receive the cable, inclined guide sheaves for directing the cable `from vone groove of the drum to another, a cable wound over said drum and sheaves with its ends extending in the saine general direc tion, a lever operating brake device cooperative with said druinto govern the movement of the cable, and a cable'tensioning mechanism cooperative with said drum 4and sheaves and comprising a sub-trame, a `pair Idil ing one auxiliary drum for the incoming side and one for the outgoing side of the cable, each of said drums having brake drum elements movable with the same7 a pair of yoke frames slidably mounted on said subrame, pressure rollers having shafts journaled in bearings in said yoke frames, there being one pressure roller for each auxiliary drum7 vertical and horizontal sets or" guide rolls in advance of said auxiliary Jframe over Which and betvvcen which the incoming and outgoing sides of the cable pass, means cooperative with said yoke 'frames for forcing one roller towards its respective drum While simultaneously releasing pressure on the other roller, other means for applying a normal pressure zto said yoke frames to thereby maintain their respective rollers in Working relation to their respeetive drums, said last named means comprising springs and means for adjusting the tension of said springs.

23: In a snubbing machine Wherein is provided a main drum and sheaves over which a cable is Wound and vvherein is provided means for governing the rotation of said drum; of a tensioning device through which the cable passes 'in moving to and from said drums, said tensioning device comprising a sub-frame, drums journaled in bearings on said sub-frame over Which the incoming and outgoing side-s of the cable pass, pressure rollers cooperative with each of said subframes, drums to hold the cable in contact therewith, means for applying braking pressure alternately to said rollers and means allowing said rollers to yield for the passage of knots and splioes in the cable.

HENRY C; CURRIER.

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