US1263836A

US1263836A - Pipe-cleaning machine.

Info

Publication number: US1263836A
Application number: US9348316A
Authority: US
Inventors: Charles F Ball
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-04-25
Filing date: 1916-04-25
Publication date: 1918-04-23
Anticipated expiration: 1935-04-23

Description

C. F. BALL.

PIPE CLEANING MACHINE.

APPLICATION FILED APR.25. |916.

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` c. F. BALL.

PIPE CLEANING MACHINE. APPLICATION FILED APR. 25 ISIS.

Patuted Apr. 23, 1918.

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YVITNESSES: l INVENTOR Uilm?. WUW,

o. F. BALL.

PIPE CLEANING MACHINE.

APPLICATION FILED APR. 25. |916.

4 SHEETS-SHFET 3.

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I X V ENTOR Patented Apr. 23,1918.

C. F. BALL.

PIPE CLEANING MACHINE.

APPLICATION FILED APII.25, I9I6.

Patented Apr. 2

4 SHEETS-SHEET 4.

III Ill.

III IlIII II I INVEL DOR ATTORNEYS' Berkeley, in the county of Alameda and Y State of California, have invented new and' All t1 LIES F. BALL, 0F BERKELEY, CALIFORNIA.

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Specification ct tetters Patent.

Patented Apr. 23, 191..

Application led April 25, 1916. Serial No. 93,483.

To all lwhom it may concern.' A

lBe it known that ll, CHARLES F. BALL, a citizen of the United States, residing at useful Improvements in Pipe-Cleaning Machines, of which the following is a specification.

rlhis invention relates to a pipe-cleaningV machine.

@ne of the objects of the present invention is toprovide a pipe cleaning machine and particularly a motor-driven machine which is adapted to travel over a continuous pipe line of indefinite length with the pip as a track.

Another object of the invention l'is'. to provide a novel form of cleaning mechanism whereby the entire surface of the pipe may be hammered, chipped, scraped and brushed.

Another object is to provide means whereby power from the motor may be transmitted to operate the cleaning mechanism employed as the machine travels and also to provide means for adjusting the position of the cleaning mechanism with relation vto the pipe when passing over uneven surfaces ,y

such as may be presented by couplings connecting the pipe sections. Further objects will hereinafter appear.

'lhe invention consists of ther'parts .and

.the construction and combination, of parts as hereinafter more fully ldescribed and claimed, having reference to the accompanyr ing drawings in which- .Y Figure 1 is a side elevation of the vma'- chine partly in section, showing it'in position on a pipe.` Y. i Fig. 2 is a diagrammatic view, showing the striking points of the chipping hammers as the machine advances along the pipe.

Fig. Sis a rear end view of the machine, partly in section.

Fig. d is a front end view, partly in sec-v tion.

Fig. 5 is a side elevation, partly in secr' tion, of the machine taken from the side supporting roller, the arm by which the roller is supported and the lock for securing the arm inv its depressed position.-

Referring` to the drawings in. detail, A indicates the pipe line to be cleaned. Adapted to be supported by wheels 2 and 3 on the pipe line and to travel on same as on a track is a carriage-.4c on which is mounted a motor', from which power is transmitted to drive or propel the carriage along the pipe line. Mounted on one side of the motor bed,6 and supported by bearings 7, is a driving shaft 8 which is driven direct from the motor shaft by means of a silent chain 9 through a clutch 9h Secured on the shaft 8, intermediate of the rear end bearing 7 and the said chain 9 is a driving pinion 10, which intermeshes with a gear 11, carried by a shaft 12 journaled in a bearing 13, supported by'an upright frame 14 (Figs. 3 and d) suitably secured on the carriage.

Secured to one side of the gear 11 is a pul-I ley 15 and secured vupon a shaft 16 journaled in a bearing secured in a vertically extending pipe fra-lne 17 is a pulley 18, to which power is'transmitted from pulley 15 by means of a belt 19. `Secured on the Shaft 16 carrying the pulley 18 is a. worm gear 26 and intermeshing with said gear is a worm gear 21 whichis secured upon a Avertically positioned shaft 22 journaled at its upper end in a-bearing` secured in the-pipe frame .and at its lower end ina bearing 23 mounted upon the carriage. Secured on the shaft 22, just above the bearing 23,"is a worm gear 2li and intermeshing with saidI gear is a worm wheel 25 -which is secured to a shaft 26 journaled .in the direction of arrow a along the pipe line through the connected gear train just described. YThe gear reduction here provided is such that the carriage moves very slowly along the pipe line although the enl gine or motor speed may be comparatively high. The supporting rollers 2, which may be termed the carriage driving wheels, are

as before described, secured upon the shaft 26, which in turn is carried by a pair of rigid bearings secured in the carriage. A xed relation between the carriage and the pipe line A is thusalways'v maintained as far as one end of the machine is concerned. The opposite end, supporting the roller 3, may however, be raised or lowered with relation to the pipe line A as the roller 3 is carried by an arm 3 pivotally mounted on the -forward end of the carriage. u The arm extends through a slot 4a formed in the top of the carriage to permit the roller 3 to engage with the pipe and support the forward end of the carriage this slot also 4permitting the roller and arm 3a to be raised away from the surface of the pipe when certain' obstacles, hereinafter to be described, are encountered. The arm is however, normally locked against pivotal movement when the roller 3 engages with the pipe. T his is accomplished as follows: Formed on the lower end of the arm 3al is a pair of projecting shouldered lugs 30, which are positioned one on each side of the roller, see Fig. 8. Engageable with said projecting lugs is a sliding block 31 which is secured upon a rod 32 slid-ably mounted with relation to the carriage in a position intermediate of the top of the pipe A and the interior upper side of the carriage. A spring 33 surrounding the slidingvrod 32 normally forces therod with its attachedv block 31 forward into engagementv with the projecting lugs 30, thus locking the arm 3t against upward movement 'with relation to the forward end of the carriage and the surface of the pipe line. The roller 3 is thus maintained 1n a fixed position with relation to the pipe line and this position is such that the carriage with the cleaning mechanism mounted thereon, will assume a central position with re. lation to the pipe line. Means have however, been provided for retractin the sliding block with relation to the proJecting lugs 30 formed upon the arm 3'.to permit the latter and its attached roller to swing about its pivot. This is accomplished in this instance by means of a fiexible cord 34 attached to a handle or other suitable operating means at its upper end and having its' opposite end attached to the end of the rod 32. A pull on the cord will retract the rod 32 and attached sliding block, back against the tension of thespring 33 and out of engagement with the mitting it, with its attached roller, to rise over any obstructions such as couplings which are encountered -along the pipe line. It is however, necessary to maintain the forward end of the carriage in alinement with the pipe line while the roller 3 is passing over the obstruction. This is` accomplished by securing a pair'of rigid shoes 35 within the interior of the carriage, which will engage the surface of a coupling or other obstruction encountered, see Flg. 5. These shoes are set suiiciently forward of the roller to engage the obstruction before the roller reaches the obstruction as it would be almost impossible to release the roller before the weight of the carriage is removed. The forward end of the carriage is in this mannersupported with relation to the pipe, thus maintaining the cleaning mechanism hereinafter to be described, ina central position while the roller 3 and connected arm are free to rise and ride over. the obstruction. The sliding block is released the moment the obstruction has been passed and is then projected by the spring 33 into its forward position where it will again lock the arm against movement, thus holding the roller 3 in engagement with the top surface of the pipe line,

The carriage proper is preferably in the form of a tubular shell, the central portion of which is cut away at its lower side to permit the shell to straddle the pipe and to be lifted olf the pipe line, when desired.

The cleaning mechanism proper consists of a plurality of hammers mounted on thc forward end of the carriage, which are adapted to hammer,.chip and scrape the entire pipe line surfac(` and furthermore consists of a plurality of wire brushes mounted on the rear end of the carriage, which are adapted to lthoroughly brush and clean the pipe line after it has been chipped and scraped. The forward end of the carriage is provided with a halfvrond bottom section 54 which is adapted to inclose the lower side of the pipe line. This bottom section is secured to the carriage shell by means of bolts 36 and may therefore be quickly removed when it is desired to dismantle the machine as a whole with relation to the pipe line. Journaled in the bottom section is a plurality of rollers 37 (Fig, 4) and journaled in the carriage proper in alinement with same Ais a plurality of rollers 38. Supported by said rollers is a drum 39 which is adapted to be revolved with relation to the carriage and pipe line. This drum is made in two sections divided on the line 40. The sections are hinged together on one side and secured on the other side by means of bolts 41. Secured on the exterior of the drum 39 is a plurality of forked bracket members 42 and pivotally mounted in each forked .bracket member as at 43 is an arm 44 (Fig. l). livotally mounted as at v45 in the outer end of each arm is a hammer head 46 and adj ustablv secured in the lower end of each head is `a removable chipping point 47. The pivotal movement of the hammer head 46 is limited in one direction by a pair of lugs 48, which engage with a pin 49 secured in the arm 44, and in the opposite direction by means of a lug 50 formed on the lower side of the arm. Mounted on the inner end of each arm is a'roller 51 and interposed between each roller 51 and the pivotal point of the Y arm indicated at 43 is a coil spring 52.

Lacasse by said rollers is a second drum 58 which-'is made in ytwo sections, secured together by bolts. Carried by thedrum 58 is a spur gear 59 and carried by a plurality of forwardly projecting arms'60 formed onthe drum 58, is a cam ringfl. ]Formed interiorly of the l ring, in alinement-with the rollers 51 is a plurality of step-like cam members 62 which are provided for the purpose of rocking the arms 44 about their pivotal mountings 43, in this manner raising and lowering thehammers with relation to the pipe line surface. 'Secured on the exterior of the drum 39 is a spur gear 63, which intermeshes with a driving p1n1on 64, secured on a shaft 65. This shaft is mounted in bearing members 66 secured on one side of the 'carriage and is driven by the main driving shaft 8, through meansV of the gear train indicated at 67, consisting of the

gears

68, 69 and 70. A comparatively slow revolvingvmovement is in this manner transmitted to the drum 39, which, as previously described, supports the arms 44 and attached hammers 47, while a comparatively fast revolving movement' is transmitted to thedrum 58, carrying the cam ring 61; the drum 58 being driven as here shown, directly from the driving shaft by means pf a Spur gear 7l secured on the forward end of the driving shaft 8. The comparatively fast revolving movementl of the cam ring causes each hammer to bew raised with relation to the pipe linesurface six times during one revolution of the drum 58 as the interior surface, of the cam ring isprovided with six individual cams, such as indicated at 62. The drum 58 furthermore makes 'nine revolutions during one revolution of the drum 39, thus causing each hammer to strike fiftyefour blows during one revolution 'of the drum 39. -The drum 39is in this instance shown as supporting twenty hammers, and as each hammer strikes the pipe line surface fifty-four times during one revolution, it can be .seen that the entire surface of the pipel is thoroughly hammered and chipped. The force of the striking blow of each hammer depends upon the tension of the spring 52, and on this tension entirely, as the cams 62 merely act to rock the arms 44 about their individual pivots 43 against the tension of the springs 52.

The pivotal mounting of each individual hammer head 46 forms one of the important features of the present invention. This can be seen from the following description: The gear driven cam ring revolving at a comparatively high speed, raises each hammer to the dotted line position indicated at 44.

The quick upward movement thus transmitted, throws the pivotally mounted hammerhead 46 to a position where the lugs 48 will engage the stop pin 49. The connected coil spring is. at the same time compressed and will immediately drive the hammer in a downward direction the moment the inner v end,of the arm is released by the offset in the cams. The hammer point 47, when striking I the pipe, assumes an angular position and therefore delivers a glancing blow which causes the hammer head to rock about the pivot 45 until stopped by the lower lug 50. The glancing blow thus transmitted deflects the hammer point 47 from the full line position to the dotted line position indicated at 47, where further movement, as before described, is prevented by lug 50.. This deflection of the hammer point ,or hammer as a whole, imparts a scrapingaction which materially assists in cleaning the pipe surface. The pipe surface is in this manner not only hammered but it is also chipped and scraped 'by each `individual hammer supported and constructed as here shown.

lE|` or the purpose of preventing rust, scales, paint or any material thus removed from entering between the carriage properand the pipeline or from flying back against the cam ring, a flexible shield 72 has been provided. This snugly fits the exterior surface of the pine line and as it may be constructed of a `flexible material such as rubber or felt, it is obvious that'it will yield sufliciently to' pass over'` any obstructions 10o on the line.v The shield proper is secured tothe forward end of the carriage by a plate73 and its exterior 'diameter is sufficiently. great to prevent the loosened material removed from the surface of the pipe 106 from flying back into the cam ring, the driving gears or the other mechanism shown.

The final cleaning of the pipe is accomplished by means of the wire brushes indi- 11o cated at 74, mounted on the rear end of the carriage. The brushes are in this instance shown as secured to the outer ends of arms 75 pivotally mounted as at 76 in a drum 77. This drum is also made in two sections, and Mt is supported'on a plurality of rollers 79, journaled between flanges 80 secured on the carriage. Any suitable form of wire brushes may be employed and-while eight are here shown, it is obvious that any numma ber may be employed. 'the outer ends of the fbrush supporting arm are connected, one with the other, by means of coil springs indicated at 81. These springs force the arms inwardly and consequently determines m5 the pressure with which the brushes bear against the pipe line.,` The drum 77 is in this instance adapted to be oscillated to cause the brushes to move back and forth, or more exactly, around and back over the lst surface of .the pipe as the carriage is being slowly/propelled "in a forward direction.

This is accomplished as follows: Secured on theouter end of shaft 12 is a crank arm 84,

and connectingV said arm with the drum 77 transmit an 4oscillating movement to the drum 77, which causes the brushes to move i back and around over thesurface of the plpe, in this manner thoroughly removing any loose scales or rust not previously removed by the hammers. The several rollers supporting the

respective drums

39, 58 and 77 are ianged and therefore secure the drums against endwise movement with relation to the fcarriage. lThe half round shape of the carriage shell, together with the sectional drums and removable bott'om section mentioned, permits the machine, as a whole, to be quickly placed in position upon a pipe line or dismantled with relation to same. v

The lower side of the pipe line is usuall most in need of cleaning; it is Valso the har est to clean and the hardest to inspect. The

work accomplished by a machine of the.

character4 here described is however, absolutelyl uniform as it hammers, chips, scrapes and brushes every 4fractional partk of the surface area lpresented with a uniformity only possible by machine operation. In cleaning pipe lines it' is often found that pit holes are covered with a thick scale of hard rust, which looks very much like good pipe. Unless this hardvscale is broken by chipping, the presence of the l'pit holes is not even suspected and serious consequences will therefore often result when handcleaning is attempted. The machine cannot leave such patches of pipe. The hard rust covering pit holes is broken by the chipping action of the hammers and the soft rust that fills them is completely brushed out andremoved by the oscillating movement of the stiff wire brushes. The life of the pipe line is in this manner not only increased as objectionable features of the character described are positively overcome, but a cleaner and more thorough result is also obtained at a comparatively small cost.-

This can easily be understood by referring to Fig. 2 which is a diagrammatic view showing the point of impact-between each individual hammer and the pipe line surface. The dotted line indicated at 96 shows the line of impact of one individual hammer. The forward point of a` line.97 shows the point where the hammer strikes and the rear point 98 the distance the pipe is lscraped by the deflecting movement previously described. This scraping action is of great importance as it provides practically speaking, the only means whereby paints and bitumimachine.

nous pipe covering materials can be thoroughly removed.

By referring to Fig. 3 it will be seen that the pipe frame 17 is provided with a pair of handle .extensions 17, extending crosswise of the frame. These handles are provided for the purpose of supporting the mazhine while it is traveling 'along the pipe In operation with the'machine in position on the pipe line and with the engine started, it is only necessaryto throw' in the clutch 9a. Power will then be transmitted through the various gear trains shown to operate the scrapin and chipping hammers and the oscillating rushes. The machine is at all times maintained in a vertical position by means of handles 17a which are grasped by an operator walking on one side of the It sometimes happens that exceedingly bad patches of pipe are encountered and that it is desirable to stop the machine from advancing or to-slow it down to permit morev thorough cleaning of the pipe. This may. be accomplishe in two different manners, either by slowing down the 'speed of the motor or by a hand-feed controlled by a crank indicated at 90. This crank is secured on the end of a sectional itis desired to slow down the automatic forward feed of the carriage controlled by the belt 19, pulley 18 and gears 20 and 21, it is only necessaY to throw in the clutch 93 and turn the s aft 22fby means of the crank 90 and the intermediate beveled gears 92. A comparatively slow or fast speed controlled by the operator through means of the hand crank 90 maythus be transmitted to move the carriage along the pipe line and any bad patches may be thoroughly gone over.` The belt drive lndicated at 19 permits the hand-feed to operate without disconnecting the belt driven from the shaft 12 as suflicient slippage takes place.

It will be remembered from the earlier description in the specification, that the forward roller 3, together with the mainsupporting rollers 2 maintain a predetermined spacing between the cleaning mechanism and the pipe line. Theserollers however, only maintain a vertical adjustment. Means must therefore necessarily be provided for the purpose of maintaining the sides of the carriage in a iXed spaced position with relation to the pipe line. This is accomplished by means of a pair of spring shoes 95, se-

Lacasse 4 mounted hammer lieads48 are nothing more or less than pointed bolt ends andas these are cheaply manufactured and easily 1nserted, it is obvious that they 'may be removed from time to time and replaced byA new points without materially delaying the operation of the machine.

The materials and finish of the several parts of the invention may be such as the judgment and experience of the manufacturer may dictate.

I wish it understood that various changes in form, proportions and minor details of construction may be resorted to within the scope of the appended claims, and that I do not wish to limit myself to the specic design and construction here shown.

I-Iaving thus described'my invention, what I claim and desire to secure by Letters Patent is- 1. In a pipe-cleaning machine, the combination of a carriage having propelling mechanism adapted to travel on a pipe as a track; percussion mechanism mounted on the carriage adapted to hammer and chip the exterior surface of the pipe; mechanism for brushing said pipe surface; and connections between said propelling mechanism and said percussion and brushing mechanism for operating both of the latter fromthe former during the travel of the carriage.

2. In a pipescleaning machine, the combination of a carriage adapted to travel along a pipe as a track; percussion mechanism mounted at one end of the carriage.

adapted to hammer and chip the exterior surface of the pipe; mechanism for brushing said pipe surface located at the other end of the carriage; mechanism for propelling said carriage; and connections between said propelling mechanism and said percussion and brushing mechanisms for operating both of the latter from the .former during the travel of the carriage.

3. In a pipe-cleaning mechanism, the combination of a carriage adapted to encircle a pipe to be cleaned; a plurality of pivotallymounted, spring operated hammers carried by said carriage and grouped around the exterior surface of the pipe so as to strike against said surface; and cam mechanism operative upon said hammers to move the same in one direction against the action of their operating springs and compress the latter.

4;. In a pipe-cleaning mechanism, the combination of a carriage adapted to encircle a pipe to be cleaned; a plurality of pivotallymounted, spring operated hammers carried by said carriage and grouped around the exterior surface of thepipe so as to strike against said surface; and revolving cam mechanism operative upon said hammers to move the same in one direction `against the action of their operating springs and compress the latter.

5. In a pipe-cleaning mechanism, the combination of a carriage adapted to encircle a pipe to be cleaned; a plurality of pivotallymounted, spring-operated hammers grouped around the exterior surface of the pipe so as to strike against said surface; a revolving d rum carrying said hammers; said drum encircling ,said plpe and carried by said carriage; and cam mechanism operative upon said hammers to move the same in one direction against the actionof their operating springs and compress the latter.

' 6. In a pipe-cleaning mechanism, the combination of a carriage; a plurality of pivotallymounted, spring-operated hammers carried by said carriage and grouped around the exterior surface of the pipe so as to strike against said surface; a revolving drum encircling said carriage; and a plurality of cams fixed 4to said drum and operative upon said hammers to move the same in one direction against the action of their operating springs and compress the latter.

7. In a pipe-cleaning mechanism, the combination of a carriage; a plurality of 'pivotally mounted, spring-operated hammers adapted to strike against the exterior surface of the pipe; a revolving drum carrying said hammers; a revolving cam drum, both of said drums encircling .said carriage; and a plurality of cams fixed to said cam drum and operative upon said hammers to move the `same in one direction against the action of their operating springs and compress the latter.

8. In a pipe-cleaning mechanism, the combination of a carriage; a plurality of pivotally mounted, spring-operated, hammers adapted to strike against the exterior surface of the pipe; a revolving drum lcarr ing said hammers; a revolving cam drum, lioth of said drums encircling said carriage; a plurality'of cams fixed to said cam drum and operative upon said hammers to move the same in one direction against the action oftheir actuating springs and compress the latter; means for driving the hammer drum at a comparatively slow speed; and means for driving the cam drum at a comparatively high speed.

9. In a pipe-cleaning machine, the combination of a traveling carriage; a revolving ring carried thereby and adapted to encircle the pipe to be cleaned; a plurality of hammers pivotally connected' to said ring; and mechanism for repeatedly swinging said hammers forcibly on their pivots a plurality of times during each revolution of said ring so as to cause them to strike sharply against the pipe. 10. In a pipe-cleaning machine, the combination of a traveling carriage; a plurality of hammersadapted to strike against the pipe to be cleaned; a carrier for said hammers mounted on said carriage and movable relatively to the same; and means foi` repeatedly swinging said hammers forcibly on their pivots a pluralityof times during each complete movement of said carrier so as to cause them to strike sharply against the pi e. y

11. n a pipe cleaningmachine, the combination of a combined chipping and scraping hammer, comprising a pivotally mounted arm and a hammer head pivotally mounted in the outer end of said arm; means for swinging said arm sharply toward the surface of the pipe to be cleaned, so as to cause the hammer head to strike against said surface and to rock on its pivot; and coperating means onsaid head and arm for limitingthe rocking movement of said head relatively to said arm during the swinging.

movement thereof in both directions.

12. In a pipe cleaning machine, a combination chipping and scraping hammer comprising a pivotally mounted arm, a hammer head pivotally mounted on the outer end of the arm for rocking movement rela-I tive to'said` arm, means for .limiting the rocking movement of the hammer head, a roller mounted on the inner end of the arm, a spring engageable with the inner end of the arm and a revolving cam member intermittently engageable with the roller, adapted to depress the inner end ofthe arm Vto raise the hammer head and to compress the spring.

13. In a pipe cleaning machine, a motordriven carriage adapted to travel on a pipe as a track, a bearing ring mounted on the forward end of the carriage and surrounding the pipe line, a drum carried hy said bearing ring, a plurality of chipping hammers carried by said drum, means for raising and lowering the chipping hammers with relation to the exterior surface of the pipe line and means for transmitting power from the motor, to revolve the drum and to operate the said hammers.

14. In a' ipe cleaningpmachi'ne, a motordriven carriage adapted to travel on a pipe as a track, a bearing ring mounted on the forward end of the carriage and surrounding the pipe line, a drum carried by said bearing ring, a plurality of chipping hammers carried by said drum, means for raising and lowering the chipping -hammers with relation to the exterior surface of the pipe line, means for transmitting power from the motor to rotate the drum, and means for maintaining the drum in' a concentric position with relation to the pipe line. y

15. In a pipe cleaning machine, a motordriven carriage adapted to travel on a pipe as a track, a bearing ring mounted on the forward end of thecarriage and surrounding the pipe line, a drum carried by said bearing ring, a plurality of chipping hammers carried by said drum, means for raising and lowering the chipping hammers with relation to: the exterior surface of the pipe line, means for transmitting power from the motor to revolve the drum, a drum journaled on the rear end of the carriage, a plurality of rearwardly extending arms pivotally mounted on said drum, a brush secured on the outer end of eacharm, means for applying external pressure to the arms to force the brushes against the exterior surface of the pipe line and means for transmitting an oscillating lnovement to the drum. l

16. In a pipe cleaning machine, a motordriven carriage adapted to travel on a pipe as a track, a drum journaled on the carriage, a plurality of arms pivotally mounted on said drum, a brush secured to the outer end of each arm, means for applying external pressure to the individual arms to force the brushes into engagement with the exterior surface of the pipe line, means for transmitting anv oscillating movement to the drum and means for transmitting power fromvthe motor to operate said oscillating mechanism while the carriage is traveling along the pipe line.

17. In a pipe cleaning machine, a motor driven carriage adapted to travel on a pipe line as a track, a bearing ring secured on the forward end of the carriage, a turnable drum journaled on said bearing ring, a plurality of combination chipping and scraping hammers supported by said drum, a second bearing ring mounted rearwardly of the first named bearing ring, a turnable drum journaled on said second bearing ring, means for transmitting power from the motor to revolve the first named drum, means for transmitting power from the motor to revolve the second named drum at a greater speed than that of the first named drum and means carried by said second named drum for 'raising and lowering the hammers with relation t0 the pipe line surface.

18. In a pipe cleaning machine, a motor driven carriage adapted to travel on a pipe line as a track, a hearing ring secured on the forward end of the carriage, a turnahlc drum journalcd on said bearing ring, a plurality of combination chipping and scraping hammers supported by said drum, a second bearing ring mounted rearwardly of the nana,

, .journaled on said second earing ring, means v for transmitting power from the motor to revolve the first named drum,'" means for transmitting power trom the motor to revolve the second namedv drum atva greater speed than that of the ir'st named drum, a

. ring lsecured to. the second named drum,-av

plurality of cam members carried by said ring, a plurality of pivotallymounted arms mounted on the first named drum supporting the chipping and scraping hammers on their outerends and having rollers mounted on their inner ends positioned in alinement with the cam members and adapted to be delpressed by said campmembers, and `means 'positioned under'each arm, adapted to force the 'hammers inwardly against the pipeline surface when the inner ends of the arms are released Aby the cams. Y

19. ln a pipe cleaning machine adapted' to travel on a pipe line as a track, a cleaning device comprising aplurality of brushes surrounding and engaging the exterior surface of the pipe, and means operated automatically from the propelling means for oscillating said brushes during the travel of the carriage.

' 20. ln a.y pipe cleamng machine, a carriage comprising a semi-circular shell adapted to straddle a pipe line, a three point roller support for said carriage, a motor on the carriage, means for transmitting power i from the motor to the rollers to propel the' carriage along the pipeline as `on aA track,

y means` on the carriage for hammering, chipping and scrapin the pipe line and means on the carriage or brushingthe pipe sur- .face

21. ln a pipe cleaning machine, a motordriven carriage adapted to travel on a pipe as a track, 'a drum journaled onthe carriage, aplurality of arms pivotally mountedvon said drum, a wire brush secured to the outer end of each arm, means for applying external pressure to the individual arms to force the brushes into engagement with the exterior surface of the pipe, means for transmitting an oscillating movement tothe drum, means for transmitting ,power from the; motor to operate said oscillating mechanism while the carriage is traveling along the pipe, and means on' the carriage .for chipping and scraping the pipe surface in advance of the brushes.

22. ln a pipe cleamng machine, a motorv driven carriage adapted to travel on a pipe as a track, a bearing ring mounted on the .forward end ot' the carriage'and surrounding the plpe, a drum carried by said bearing concentric position with relationtothe pipe, .said means comprising an adjustable roller mounted on the forward end of the pearriage, and -a pair of spring actuated shoes carried by the carriage and engageable with the sides of the pipe.

23. ln a pipe cleaning machine, a motordriven carriage adapted to travel on a pipe as a track, a bearing ring mounted on the forward end of the carriage and surrounding the pipe, a drum carried by said bearing ring, a plurality of chippin hammers carried by said drum, means or raising and lowering the chipping hammers with relation to the exterior surface of the pipe, means for transmitting power from the motor, to revolve the drum and to operate the said hammers, a second drum mounted on the carriage and surrounding the pipe,` a plurality of brushes mounted on the second drum and engaging the surface of the pipe, and means for transmitting an oscillating movement to said second drum.

24. In a pipe-cleaning machine, the combination vof a carriage adapted to travel mit mitl

along the pipe to be cleaned; a drive shaft I mounted in said carriage and connected to propel the same; a drum journaled on the carriage; a plurality of brush-carrying` vided at its outer end with a brush; means for yieldingly holding the brushes against the surface of the pipe line tobe cleaned; and meansy for imparting an oscillatin movement to said drumv during the travi of' the carriage. j

In testimony whereof l have hereunto set my hand in the presence oftwo subscribing witnesses.

` 11 lB`. BALL.

Witnesses:

,'JoHNll. i; a