US 3776179 A
Device for pushing and pulling implements (e.g. pipe coating testers, pipe markers, pipe cleaners, pipe spray guns) along pipes or like elongated workpieces, said device having adjacent spools or reels with spirally coiled implement feeding and operating elements wound on the respective reels, the feeding element being operative to push and pull the implement into and from the pipe (or along the pipe) while the implement operating element is unwound from or rewound onto its reel.
Claims available in
Description (OCR text may contain errors)
United States Patent [1 1 Raney et a].
[111 3,776,179 Dec. 4, 1973 DEVICE FOR PUSI-IING AND PULLING IMPLEMENTS, INCLUDING CABLES, INTO AND FROM CONDUITS AND THE LIKE  Inventors: William E. Raney, 511 Morewood Pkwy., Rocky River, Ohio 441 16; Milan J. Siebert, 5617 Onaway Oval, Parma, Ohio 44130 22 Filed: Apr. 21, 1971  Appl. N0.: 136,189
Related US. Application Data  Continuation of Ser. No. 762,061, Sept. 24, 1968,
Pat. No. 3,612,487,
 U.S. Cl 118/8, 118/9, 118/306, l5/l04.3 SN, 118/DIG. l0, 118/DIG. 11  Int. Cl. B05c 7/02, BOSc l-1/00  Field of Search .1 118/9, 306, DIG. 10, 1l8/D1G. l1, 8; 254/174; 15/1043 SN  References Cited UNITED STATES PATENTS 2,501,779 3/1950 Loudenback etal. 118/306 2,556,484
6/1951 Raney 254/l34.3
Primary Examiner-John P. McIntosh Att0rneyOberlin, Malgy, Donnelly & Renner  ABSTRACT Device for pushing and pulling implements (e.g. pipe coating testers, pipe markers, pipe cleaners, pipe spray guns) along pipes or like elongated workpieces, said device having adjacent spools or reels with spirally coiled implement feeding and operating elements wound on the respective reels, the feeding element being operative to push and pull the implement into and from the pipe (or along the pipe) while the implement operating element is unwound from or rewound onto its reel.
4 Claims, 7 Drawing figures I WENTEMER m5 UFFT I ENTEDUEC 4 I975 PULL DEVICE FOR PUSHING AND PULLING IMPLEMENTS, INCLUDING CABLES, INTO AND FROM CONDUITS AND THE LIKE I This application is a division of U.S. Pat. Ser. No.' 762,061, filed Sept. 24, 1968, entitled Device for Pushing and Pulling Implements, Including Cables, into and from Conduits and the Like, now U.S. Pat. No. 3,612,487.
BACKGROUND OF THE INVENTION It is known for example, as disclosed in William E. Raney U.S. Pat. Nos. 2,556,484 and 2,718,376, to pro vide a cable puller which is operative first to push the free end of a spirally coiled fish tape through an electrical conduit from one end to the other and then to pull in the fish tape together with an electric cable attached thereto, thus to pull the cable into the conduit.
SUMMARY OF THE INVENTION" In the present invention, the fish tape of a cable puller is attached to an implement to move the latter in opposite directions within a pipe or therea'long, and a spirally coiled operating element wound on a reel adjacent the fish tape reel is also connected tothe implement to operate the latter. By way of illustrative examples, the implement may be a current leakage tester for' determining flaws in pipe coatings, a marker having a solenoid operated marking pen for marking the locations of coating flaws indicated by the tester, a spray gun for coating a pipe, or a brush for cleaning a pipe; and in these respective cases, the operating elements may comprise electric supply cables for the tester and marker, paint and/or air hoses for the spray gun, and a cleaning fluid supply hose and spray nozzle 7 for the brush.
Accordingly, it is one object of this invention to provide a device of the character-indicated wherein adjacent spools or reels have implement feeding means and implement operating means coiled therearound for moving the implement in opposite directions with re- 7 spect to a longitudinally elongated-workpiece such as a length of pipe or the like, and for operating the implement during either or both the feeding and return strokes of the implement.
It is another object of this invention to provide a device of the character indicated in which the drive motor is equipped with a disk brake or the like, the motor being deenergized and braked in response to predetermined pull-in of the feed element.
It is another object of this invention to provide a device of the character indicated which has means responsive to predetermined pushing load on the feed element to de-energize the drive motor and to apply the brake to arrest the feeding movement as when the implement attached to the feed element encounters an obstruction in the pipe or the like through which the implement is being fed.
It is another object of this invention to provide a device of the character indicated having a novel reversing mechanism to effect movement of the feeding and operating elements aforesaid in opposite directions with respect to an elongated workpiece such as a pipe or the like.
'Other objects and advantages of the present invention will become apparent as the following description proceeds.
To the accomplishment of the foregoing and related ends, the invention. then, comprises the features hereinafter fully described and particularly pointed out in the claims, the following description and the annexed drawings setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of a few of the various ways in which the principle of the invention may be employed.
BRIEF DESCRIPTION OF. THE DRAWINGS FIG. 1 is a top plan view of a device for testing the internal coating of a pipe and for marking the pipe at the points where flaws are detected by the tester;
FIG. 2 is an elevation view, partly in cross-section, as viewed along the line 22, FIG. 1;
FIG. 3 is a cross-section view taken substantially along the line 33, FIG. 2;
FIG. 4 is a view of the drive motor reversing mechanism taken substantially along the line 4-4, FIG. 1;
FIG. 5 is a schematic wiring diagram of the embodi ment of the invention shown in FIGS. 1 to 4;
FIG. 6 is a fragmentary top 'plan view similar to FIG.
1,.except showing a device for'testing the coating on DISCUSSION OF THE INVENTION Referring now to FIGS. 1 to 5, the device 1 shown for purposes of illustration is a coating flaw detector and marker and comprises a support 2 for a length of pipe P having an internal coating of plastic or the like. Adjacent to one end of said support 2 is a reversible drive motor 3 which through the worm unit 4, drives a shaft 5 on which spools 6 and 7 are keyed, said shaft 5 having pinions 8 thereon each of which mesh with an internal gear 9 of a spool 10 joumalled in a housing 1 l as by rollers l2. Coiled around the spools 6 and' 7 are implement operating means 14 and 15 and coiled around the gear-driven spools 10 are implement feeding means 16;]6. I
Each implement feeding means 16 comprises an elongated flexible element preferably of spring metal of rectangular cross-section similar to the fish tapes employed in the cable pullers of the aforesaid Raney, U.S.
Pat. Nos. 2,556,484 and 2,718,376. The end of one element 16 is secured to a coating test unit 17 such as a contact brush movable lengthwise through the pipe P in contact with the plastic or like coating inside the pipe P. The other element 16 extends into a guide tube 19 and is secured to a marking device I8'which is guided along the guide tube 19 for movement longitudinally along the outside of the pipe P, said marking device 18 comprising, for example, a felt tip pen operated Between the spools 6 and 7 and the respective imple- I ments l7 and 18 there are provided suitable accumulators or festoon units 21 and 22 to compensate for the changing diameters of the elements 14 and 15 as unwound from and rewound onto the spools 6 and 7.
In use, when the motor 3 is energized to drive the spools 6, 7, and in a counterclockwise direction, as viewed in FIG. 2, the respective implements l7 and 18 will be moved lengthwise within and along the pipe P. When the contact brush 17 comes into an area of the pipe P where there is an aperture in the plastic coating, or where the coating is thinner than desired, there will be current leakage thereat into the metal of the pipe P and when that occurs, a relay or the like (not shown) will be actuated to conduct electric current through the marker operating element to energize the solenoid 20 thereof to mark the location of the flaw. As evident, flaw detection and marking may be done in both directions of movement of the contact brush 17 and marking device 18.
One feature of the present invention is that the drive motor 3 is equipped with a disk brake 32 or the like operated by solenoid 34 (see FIG. 5), the brake 32 being applied when the element 16 is pulled to the right as viewed in FIG. 1 to a predetermined extent. The brake operator comprises a sleeve member 23 biased by spring 24 to the position shown in FIG. 2. The feeding element 16 is provided with an enlargement 25 adjacent its end, and when said enlargement 25 contacts the flexible extension 26 attached to the end of the sleeve memer 23, the latter is moved to the right to open the limit switch 27 to de-energize the drive motor 3 and to de-energize the solenoid 34 whereby the spring 33 applies the motor brake 32 as hereinafter explained in detail in connection with FIG. 5. The sleeve member 23 and flexible element 26 may move a substantial distance compressing the spring 24 thus to avoid shock loads on the element 16 at the end of the pull stroke.
In the event that the implement 17 encounters an ob struction in the pipe P there is provided between two guide rollers 12 in the housing a spring-loaded roller 28 which, upon predetermined arching of the element 16 opens the limit switch 29 to de-energize the motor 3 and to de-energize the solenoid 34 to apply the brake 32.
FIG. 4 illustrates a novel contact arrangement for achieving operation of the drive motor 3 in opposite directions to push and to pull the implements l7 and 18. This reversing control comprises brushes 30 and 31 on a brush holder 35 which may be swung by handle 36 between the solid line PUSH position and the dot-dash line PULL position. On the brush holder 35 are auxiliary contacts 37 and 38 which cooperate with stationary contacts 39 and 40 as shown in FIGS. 4 and 5.
Referring now in detail to FIG. 5, the circuit is shown in the PULL position (handle 36 in solid line position of FIG. 4) with the motor 3 energized through closed contactor 41 of the solenoid 42 to drive the spools 10 in clockwise direction (FIG. 2) to pull in the elements 16. When the limit switch 27 is opened by movement of sleeve member 23 as previously described, the solenoid 42 is de-energized to move the contactor 41 downwardly to open the motor circuit and to deenergize the brake solenoid thus to apply the motor brake 32 through spring 33. In this way, the pulling operation is discontinued before the sleeve member 23 reaches the limit of its rightward movement.
When it is desired to push the implements l7 and 18, the handle 36 of the brush holder 35 is shifted to the dot-dash PUSH position FIG. 4) to open the contacts 38 and 40 and to close the contacts 37 and 39 whereby solenoid 42 is energized to move contactor 41 upwardly to close the motor and brake solenoid circuit. In the event that the implement 17 encounters an obstruction, the element 16 will arch at the spring-loaded roller 28 to open the limit switch 29 thus to de-energize the solenoid 42 to open the motor and brake solenoid circuit.
A remote control switch 43 may be provided as shown in FIG. 5 to stop the pushing or pulling of the elements 16 at any time.
With reference to FIG. 6, this shows a single feeding element 16 and adjacent implement and marker oper ating cables 14 and 15 for testing the coating on an exter'iorly coated pipe P and marking the exterior to denote the location of a flaw or flaws in the coating. In this case, the high voltage testing element 42 is in the form of a ring contact brush around the externally coated pipe making contact with the coating and being fed along with the marker by the single feeding element 16. Connected to the testing element 44 is the high voltage cable 14 which is unwound and rewound onto the spool 6. The marking device 18 is also connected to element 16, the cable 15 on spool 7 supplying electric current for energizing the solenoid 20 for the marking pen. In use, if the current leaks through the coating to the metal of the pipe due to insufficient thickness of the plastic coating or to, an aperture in the coating, the
current leakage will effect actuation of the marker 18 whereby the felt tip marker pen or the like will place a mark on the pipe P. If the tester l7 and marker 18 are offset as shown, the flaw will be a specified distance to the left of the mark placed on the pipe P. If desired, a time delay dash-pot or the like may be provided in the marker solenoid 20 calibrated according to the lineal speed of the testing device so that the mark will be placed at substantially the location of the flaw in the pipe coating. I
Referring now to FIG. 7, the implement there shown is a compressed air spray gun 45 which is connected to element 16 and which is fed thereby longitudinally into and from a length of pipe P which it is desired to interiorly coat. Connected to the spray gun 45 and to the respective spools 46 and 47 are air supply and paint supply hoses 48 and 49. The painting operation is preferably effected during the pull stroke of the feeding element 16. his to be understood that instead of an air spray gun 45, the spray gun may be of the airless spray type in which case, no air supply hose is needed. like wise, if the spray gun has its own paint supply reservoir only the air supply hose need be connected to the gun. Furthermore, if the spray gun is of the electric type and contains its own paint reservoir and pump, the operating element may be an electric conductor to actuate the electric motor or vibrator contained within the spray gun. Similarly, it will be apparent to those skilled in the art that electrostatic painting means may be provided if desired wherein the pipe wall is charged to attract paint particles from the spray gun.
It is also to be understood that the implement attached to flexible element 16 may be a pipe cleaning or scraping element and in that case the operating element may be an electric cable or a hose for washing fluid as desired, the electric cable being operative to control a motor or the like associated with the cleaning or scraping element.
Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims, or the equivalent of such, be employed.
We therefore, particularly point out and distinctly claim as our invention:
1. In combination, a housing having a passage disposed tangentially to a circular series of rollers rotatable in said housing; a spool in said housing joumaled for rotation therein by engagement of its periphery with said roller; reversible drive means for driving said spool in opposite directions; a spirally coiled element on said spool adapted to be payed out through said passage when said spool is driven in one direction with the outer convolution engaged with said rollers and to be pulled in through said passage for rewinding on said spool when the latter is driven in the opposite direction; an implement and opeating means therefor secured to said element for movement of said implement length-- wise in opposite directions of a pipe and the like responsive to rotation of said spool in opposite directions; another spool adjacent to said housing driven in opposite directions by said drive means and having said operating means coiled thereabout for unwinding therefrom and rewindingthereonto responsive to movement of said element and implement in opposite directions; one of said rollers being radially movably supported in said housing and spring biased toward said spool and the outer convolution of said element; and switch means operative to deenergize said drive means during pay out of said element upon predetermined radial outward movement of said one roller by predetermined arching of said element between the rollers next adjacent to said one roller by compressive load on said element; such predetermined arching of said element detecting excessive resistance to pay out movement of said implement and being effective through said switch means to deenergize said drive means.
2. The combination of claim 1 wherein said passage is defined by a sleeve axially reciprocable in said housing; wherein said element adjacent to said implement has an enlargement effective during rotation of said spool in a direction to pull in said element to engage said sleeve to move it axially; and wherein another switch means is actuated by movement of said sleeve to deenergize said drive means.
3. The combination of claim 2 wherein spring means between said sleeve and said housing yieldably resists such axial movement of said sleeve.
4. The combination of claim 1 wherein said drive means comprises an electric drive motor having a drive shaft with a drive pinion meshing with an internal gear in said spool; and wherein said another spool is keyed on said drive shaft.