US2942286A

US2942286A - Line cleaner

Info

Publication number: US2942286A
Application number: US651952A
Authority: US
Inventors: Thomas B Losey; John J Lane
Original assignee: Guiberson Corp
Current assignee: Guiberson Corp
Priority date: 1957-04-10
Filing date: 1957-04-10
Publication date: 1960-06-28
Anticipated expiration: 1977-06-28

Description

June 28, 1960 IT. 5. LQSEY ETAL 2,942,286

LINE CLEANER Filed April 10, 1957 2 Sheets-Sheet 2 INVENTORS 3 Thomas B. Loseyv John J. Lane 55 BY o V ffgfgaw QL ATTORNEYS Un t S a s at LINE CLEANER ThomasB. Losey and John J. Lane, Dallas, Ten, assignors to The Guiberson Corporation, Dallas, Tern, a corporation of Texas p Filed Apr. 10, 1957, Ser. No. 651,952 7 V 6 Claims. (Cl. -210) This invention is concerned with a device for cleaning fluid, such as mud, oil or water from a lineor cable as the line or cable is drawn therethrough.

The invention has particular utility in cleaning fluid from lines or cables used in well logging operations. In such operations an electrical detecting instrument is lowered into the well on a cable, the detecting instrument being electrically connected to recording instruments, usually located on a truck at the surface. The various formations of structure through which the detecting instrument is drawn as the cable is dravm upwardly in the well are recorded on the recording device located at the surface. V

The recording instruments are very sensitive and it is desirable that the tension and drag on the line be kept at a minimum in order to prevent undesirable deviations in the recordation and correlation of the recorded information and to prevent undue line.

It has been the practice in the past to provide a cleaning device disposed about the line or cable at the surface, through which the line is drawn, for the purpose of wiping well fluid such as mud, oil and water from the line so that such fluid will not be deposited on the truck and delicate equipment thereon. Such fluids are usually laden with corrosive and caustic material such as salt or acids injected into the well, and it is desirable .to clean such fluid from the line as it comes out of the well to prevent same from causing corrosion and deterioration of the line and equipment on the truck;

The most commonly used type of wiper in the past has been a helical wiping element disposed about the line at the surface which tightens its grip when the helix is lengthened by the line being pulled therethrough. Such a wiping device has been unsatisfactory for. several reasons. The gripping action increases with the line speed thus imposing undue load on the line, accelerating wear of the line and the wiping element, and causing undesirable deviations of the recording instruments. It does not clean the line uniformly and efliciently. Moreover, it is uni-directional in that it must be removed from the line while the line is being lowered into the well. the use of helical type wiping elements by reason of the undue tension and drag placed on the line, and the excessive wear imparted thereto.

Therefore there has long been a need for a line cleaning device which will efliciently clean undesirable fluid from the line as it is withdrawn from the well and at the same time reduce the drag on the line to a minimum.

The device which is comprehended by this invention satisfies these requirements.

Although this line cleaning device is particularly useful in wiping and cleaning fluid from a line or cable used in well logging operations, it will be understood that it is also usable for cleaning wire lines or cables in any well operation such as swabbing, perforating, wire line cementwear and damage to the ing, callipering, wire line packer settings, and other operfluid from the line.

Many line breakages have been directly traced to j ations where a wire line or cable is lowered into and withdrawn from a well. Although it is adapted for cleaning vertically disposed lines, it will be understood that it could also be employed for cleaning horizontally disposed lines which may be drawn therethrough.

Generally the invention comprehends a pair of rotatably mounted wheels or rollers having resilient cleaning elements disposed about the outer periphery thereof with peripheral channels in the outer surface of the cleaning elements :which are arranged to embrace and clean a wire line or cable as the line orcable is drawn between the contacting cleaning elements on the wheels. As the cable is drawnbetween the contacting cleaning elements the wheels are caused to rotate by the motion of the line and the cleaning elements squeeze and wipe the One of the wheels is arranged to be shifted away from and to the other wheel to permit the line to be engaged between the peripheral cleaning elements on the wheels, and means is provided for adjusting the degree of engagement of the cleaning elements with the line. Substantially all of the load is adsorbed by the bearings supporting the wheels and frictional drag is reduced to a minimum.

Thus there is no perceptible drag on the line which could cause undesirable deviation of the recording instruments, the line is protected and preserved, and the line and the cleaning and wiping elements are long-lasting; The rotating cleaning elements also remove sub.- stantially all fluid from the line.

In using the device comprehended by this invention the frictional drag on the line is so slight that even though the device is very light, weighing approximately 20 lbs., it will remainin place without anchoring, and will not ride up the line, even at high line speeds of more than 600. feet per minute. The tension on the line remains uniform at all line speeds and there is no perceptible stretch of the line, thus assuring accurate recordation and correlation of recorded information in well logging operations.

It is also unnecessary to remove the line cleaner device from the line whilethe line is being lowered into the well, because there is no undesirable frictional drag as the line is moved in either direction. I

,It is therefore a primary object of this invention to provide a line'cleaning device wherein theload imposed on the line cannot be detected by delicate logging instruments. I

Another important objct of this invention is to provide a line cleaning device which efliciently cleans the line of undesirable fluids without imposing undue load on the line. V I H Another object of the invention is to provide a line cleaning device which removes substantially all fluid from the line as it is withdrawn from the well and'keeps the equipment on the truck at the surface free of corrosiveand' caustic liquids, and also preserves the line by keeping it dry and clean as it is stored on the truck. 7

A still further object of this invention is to provide a line cleaning device which is safe, simple and easy to operate, and assures trouble-free operation.

Still another. object of the invention is to provide a linecleaning device which is light in weight and completely portable.

A further object of this invention is to provide a line cleaning device in which the cleaning elements are not subjected to undue friction and are therefore long-lived, and such cleaning elements are quickly and easily replaced.

A still further object of the invention is to provide a line cleaning device which is bi-directional in that the line maybe moved through it in either direction without re,- moving the cleaning device therefrom.

Patented June 28, 1960 7 Another object is to provide a line cleaning device which may be quickly and easily opened for placing it about the line.

A still further object of the invention is to provide a line cleaning device in which the engagement of the cleaning elements about the line may be quickly and easily adjusted while the line is being drawn therethrough to provide the optimum of wiping efiiciency at any line speed.

Another object of the invention is to provide a line cleaning device which has retractable and extensible support legs thereon to provide for easy portage and storage.

Another object of the invention is to provide a line cleaning device having guards thereon arranged to deflect fluid removed from the line back into the well, thus keeping the rig floor and surface equipment clean.

Other and further objects of the invention will become apparent upon reading the detailed specification hereinafter following and by referring to the drawings annexed hereto and made a part hereof.

A suitable embodiment of the invention is shown in the drawings in which:

Figure I is a side elevational view of a line cleaning device incorporating our invention.

Figure II is a top plan view of the line cleaning device which is sectioned on the line II--Il of Fig. I to disclose the details of construction and mounting of the cleaner supporting wheels. 7

Figure III is a bottom plan view of the line cleaning device.

Figure IV is a perspective view of the line cleaning device, showing the support legs angularly extended to support the device.

Figure V is an elevational end view of the line cleaning device taken from the right end of Figure I.

Figure V1 is a side elevational view of the line cleaning device showing one of the wheels pivoted to open position to permit a line to be placed between the wheels.

In the drawings numeral references are employed to indicate the various parts of the device shown therein, and like numerals indicate like parts throughout the various figures of the drawings. a

The numeral 1 indicates generally a suitable mounting base or frame for the line cleaning device, it being understood that the frame may take other forms than that shown.

The frame 1, as shown, consists of a channel member, preferably made of light weight material, such as aluminum, which has a bottom portion 2 and upwardly extending

parallel side flanges

3 and 4.

An angled tab 5, having a hole 7 therein, is secured at each end of the side flange 3 by means of suitable rivets 6. Chains or other securing devices may be inserted through the holes 7 to anchor the device at the well head, should such anchoring be desirable. However, ordinarily it will not be necessary to anchor the device if it is supported on a flat surface by the extended legs 8, 9 and 10, since the fricitonal drag of pulling the line through the device is so small that the device has no tendency to ride up the line, even at high line speeds. However, there may be conditions wherein the device cannot be supported on a flat surface by the legs 8, 9 and 10, and in such event it would be desirable to anchor the device by means of the tabs 5.

The legs 8, 9 and 10 are preferably made of tubula members-of light weight metal, such as aluminum, in the interest of lightness in weight. It will be understood, however, that the legs could be made as solid rods and of any suitable material. v

The legs 8, 9 audit) are hinged to the mounting base 1 so that they may be rotated to fold underneath the mounting base for the purpose of providing easy portage and compactness in storage. Eachof the

legs

3,9 and 10 is rotatably mounted to the mounting base 1 by means of a bearing block 11 attached to the inner end thereof.

A bolt 12, having a hexed wrench engaging recess 13 in the head thereof, extends through each of the bearing blocks 11 from the underside thereof and through the bottom 2 of the base 1 and is secured at the upper side of the bottom 2 by means of a lock nut 14, a washer 15 being interposed between the lock nut 14 and the base 2. A spring washer 16 is interposed between each of the bearing blocks 11 and the bottom 2 of the base 1 to provide for tensioned rotation of the legs 8, 9 and 10 on the bolts 12 to cause the legs to remain in pre-determined position in the absence of rotative force exerted thereagainst. It will thus be seen that the legs 8, 9 and 10 may be rotated on the bolts 12 to permit the legs to be extended outwardly or to be retracted under the base.

A pair of wheels or

rollers

20 and 21 are rotatably supported on the base 1 in the manner which will be hereinafter described.

Each of the

wheels

20 and 21, as shown, includes an outer rim 22 and an inner ring 23 (Fig. II) which are joined by peripherally spaced spokes 24 connected by webs 24a. It will be understood that the wheels or

rollers

20 and 21 may take several forms. They can be solid rollers, or the webs between the spokes could be eliminated, as desired. For the purpose of lightness in weight it is desirable that the wheels and as many of the other metallic parts of the device as possible be made of light weight material, such as aluminum.

Each of the

wheels

20 and 21 has an annular channel 25 formed in the outer surface of the rim 22. The channels 25 should be deep enough to receive and confine the resilient cleaner elements 26 to assume intimate contact of the annular recesses 28 with the cable when the cable is positioned between the wheels.

A cleaner and wiper element 26 which takes the form of a tire or ring, preferably made of resilient material such as natural or synthetic rubber compound, is disposed about each

wheel

20 and 21 in the channels 25. The resilient ring or tire 26 is preferably made slightly less in internal diameter than the outer diameter of the channel 25 so that the tire may be stretched and forced about the rim 22 and disposed in the channel 25 in tight impinging engagement therewith, in order to assure that the tire will not slip about the rim. The tires 26 could of course be made of any other suitable material of resilient nature, such as plastic.

Each of the tires or rings 26 preferably has outwardly extending marginal lips or flanges 27 thereon which overlie the outer edges of the rim 22 when the tire 26 is disposed in the channel 25.,

A send-circular annular recess or groove 28 is formed about the outer periphery of each of the tires or rings 26 so that when the

wheels

20 and 21 are brought together to cause the resilient tires 26 to come into engagement, as shown in Figure 11, there is formed a circular passage 29 through the contacting resilient rings 26 to thereby provide a passage through which the wire line or cable 85 may be drawn to wipe and clean the surface of such wire line or cable.

It will be noted that the outwardly extending lips 27 onthe tires 26 come into engagement when the tires are disposed about the cable or line 85 being cleaned to thereby form opposed resilient cushions which may be tightly pressed together to form sealed joints through which fluid wiped from the cable does not pass, and substantially all of the fluid removed from the cable is directed downwardly into the well. The resilient lips 27 may b compressed to permit the inward adjustment of the wheelsto adjust the cleaning elements 26 into the proper impinging engagement with the cable 85 to thereby assure that the cable will be cleaned of fluid as it passes between the cleaning elements. As the cable 85 is drawn between the resilient cleaning elements 26 the

wheels

20 and 21 are caused to rotate and the fluid adhering to the cable is actually squeezed from the cable. The impinging engagement between the cleaner elements pin and the outer face of the side'fiange 4;

r in assembled position;

and the cable 85 should preferably betight "enough so that the resilient material of the cleaner element is caused to enter any irregularities in the outer surface of the cable as it is drawn therethrough to'thereby assure that all fluid will be removed from the cable.,

, The tires 26 may be made with diiferent size grooves 28 fit different diameter of cables and wire lines, it being a simple procedure to change thetires by simply stretching one tire off the rim of the wheel andstretching another about the wheel in its place.

., Each of the Wheels and 21 is rotatably mounted on roller bearings and 30a which are identical in construction and mounting. The bearings 30 and 30a in each wheel are spaced apart and held in place with reference to the inner ring 23 by means of a removable split retaining ring 31, the outer edge of which isdisposed in an annular groove 33 on the inner side of the ring 23 and the inner edge of the ring 31 is disposed between the bearings 30 and 30a. A spacer .ring32 is disposed between the bearings30 and 30a about the bolts or axles onwhich the Wheels are mounted. V r Thebearings 30 and 30a in, the wheel20 are rotatably mounted on the frame 1 by means of a bolt or axle 34 which passes through the bearings and through the vertical wheel mounting'bracket 35. The wheel mounting bracket 35 is fixed to the side flange 3 by means of a pairof bolts and

nuts

41 and 42. A spacer and retainer Washer 36 is, disposed about the bolt 34 between the bracket 35 andtherinner face of the bearing 30. The bolt 34 passes through the irinerend of the link 37, which link isjpivoted about the bolt 34 on the bushing 38, disposed in the passage; through the link. Ashim or washer 39'is disposedabout the bolt 34 between the link 37 and the lock nut 40L- The lock nut 40 is threadedly engaged to the outer endlof the bolt 34 to retain the bolt in place and retainthebearings and link in assembled position. A bolt or axle 43 passes through the bearcured about the bolt43 at its upper end and is pivotally *mounted to thefrarne 1 by means of a pin 47 which ro- 'tatably passes through the

flanges

3 and 4 and is secured 'to the lower end of the mounting post 46. The'pin 47 V is held in place by means of a cotter pin 49 which passes through a hole in the'outer'end'thereofj' there being a Washer 50'disposed about the pin 47 between the cotter The bolt 43 extends through a shim'51 and through the outer end of the wheel adjusting arm 52. The shim 51 'is interposed between the wheel mounting post 46 and the wheeladjusting arm 52. The wheel adjusting arm 52 A washer 54 is disposed about the shaft 43 bolt' 43 'to retain the bolt in place and hold the parts An adjusting nut 58 is secured to the upper end of the wheel adjusting arm 52 by means of a weld 59. The

adjusting nut 58 is interially threaded to receive the threaded'end 65 of the adjusting shaft 61. The adjusting 'sl1'aft61includes an enlarged outer handle 60 having a knurled surface thereon'topermit ease in rotation of the adjusting shaft. The adjusting shaft 61 rotatably .ex-

tends through-a sleeve 62, there being a washer 63 interposedbetween" the handle 60 and the sleeve 62. A re- .rnovable retaining pin 64 extends through the shaft 61 to retain the adjusting shaftin place after being inserted throughthe sleeve 62.. The threaded end 65 of the ad- The adjusting sleeve arm 66 is seceured to the adjusting sleeve 62 by means of a weld 67. The outer end of the link 37 is pivotally attached to the outer end of the arm 66 by means of a screw 70 which passes through the link 37 and the arm 66 and is secured in place by means of a lock nut 73, there being a washer 72 interposed between the nut 73 and the arm 66.

The arm 66 may rotate about the screw 70 on a bushing 71, disposed in the passage through the arm.

A mud guard, generally indicated at 75, is attached to the frame 1 and includes a substantially U-shaped support member 76, one side 77 of such support 76 being arranged to overlap the underside of the base 1. A pair of upwardly extending deflector plates 78and 79 are secured to the support 76 by means of welds 80 and 80a,

such deflector plates

78 and 79 extending upwardly on each side of the contacting wiping elements 26 on the

wheels

20 and 21. The mud guard 75 is secured to the frame 1 by means of a bolt 81 which passes through the upwardly extending guard 78 and through the

side flanges

3 and 4. The bolt 81 is secured in place to the frame 1 by means of a lock nut 82 threaded on the inner end thereof. Each of the

deflectors

78 and 79 has an outwardly angled portion 83, and the upper ends thereof are curled inwardly, as indicated at 84. The fluid removed from the wire line or cable 85, as it is drawn between the

wheels

20 and 21, is intercepted by the upwardly extending

deflectors

78 and 79, and caused to flow back into the well, thus preventing any mud or fluid from being deposited. on the rig floor or on equipment surrounding the line cleaning device.

The operation and function of the line cleaning device is described as follows:

When it is desired to place the cleaning device in operative position to remove fluid from a wire line or cableextending into the well, the legs 8, 9 and 10 may be unfolded to extend angularly outwardly as shown in Figure IV. The device is then deposited on such legs on a flat surface such as the rig floor or rotary table so that the

wheels

20 and 21 are in position to receive 'the cable 85 extending into the well. The handle 60 is then grasped and pulled upwardly, thereby pivoting the link 37 arcuately upwardly to the position shown in Figure VI. Such movement causes the wheel 21 to be shifted away from the wheel 20, the post 46 being caused to pivot with the bolt 48 as the arm 52 pivots about the bolt 43, thereby moving the bolt 43 and the wheel 21 longitudinally of the frame to the position shown in Figure VI.

It will be noted that when the

wheels

20 and 21 are brought together in the positionshown in Figure I the pivotal connection between the link 37 and arm 66 is over center with reference to the pivotal connection between the bracket 35 and the arm 37, thereby causing the wheels to remain in such closed position until upward force is exerted against the handle 60.

Also when the handle 60 is in upraised position as shown in Figure VI these above indicated pivot points are over center with reference to each other so that the

wheels

20 and 21 remain in open position until downward force is exerted on'the handle 60. V

After the

wheels

20 and 21 have thus been separated as shown in Figure VI, the cable 35 is placed in position to be received in the annular recesses 28 on the outer periphery of the tires 26 when the wheels are brought together, The handle 60 is then shifted arcuatelyv downwardly to bring the wheels together, with the cable 85 disposed in thepassage 29 formed by the complementary annular recesses 28. V "In the event there is no flat surface surrounding the well opening on which the legs 8, 9 and 10 may rest theline' cleaning device may be anchoredin place by a chainattached to the tabs 5 and to some structure adja'cent the Well head. The operation described above may then be carried out.

The tightness of engagement of the resilient cleaning elements with the cable 85 may be adjusted by rotating the handle 60, thereby causing the adjusting nut 58 to travel inwardly or outwardly on the threads 65, as desired. Such adjustment will be made to cause the resilient tires 26 to tightly embrace the cable to assure that all fluid will besqueezed and flowed from the cable.

When it is desired to remove the wiper device from the cable it is only necessary to again lift up on the handle 60 to shift the wheel 21 away from the wheel 20 in the manner hereinbefore described.

The engagement of the tires 26 with the cable 85 may be adjusted while the cable is being drawn through the wheels by merely rotating the handles 60 to thereby secure optimum cleaning at different line speeds.

After the cable 85 has been so engaged between the

wheels

29 and 21, the cable may be drawn upwardly out of the well and as it is drawn upwardly the

wheels

20 and 21 are caused to rotate in opposite directions and the well fluid adhering to the cable is squeezed therefrom by the resilient tires or rings 26.

Most of'the fluid squeezed from the cable is directed downwardly into the well but such fluid as may be directed laterally is intercepted by the upwardly extending

deflectors

78 and 79 and caused to flow back into the well. The load imparted by the withdrawal of the cable is substantially all transferred to the hearings in the

wheels

20 and 2,1 and there is no appreciable amount of drag imparted to the cable 35. The fluid is removed from the cable by a squeegeeing action and the cable is substantially dry after passing between the resilient wiper elements 26.

The frictional drag between the resilient cleaning elements and the cable is so slight that the device has no tendency to climb up the cable even though the cable is withdrawn between the wheels at very high speed.

The line cleaning device has many other applications than those indicated. For instance it could be made to serve as a depthometer, by simply gearing one of the

wheels

20 or 21 to a counter, such as a VeedenRoot counter, to measure the approximate depth of the Well. Also by mounting two of the wiper devices at right angles to each other, one above the other, it could be made to serve as a guide for the line.

The resilient wiper elements 26 will also permit measuring flags to pass therethrough without aifecting the operation of the device.

It will be understood that various other forms of the invention could be devised without departing from the spirit and scope of the appended claims.

From the foregoing it will be seen that we have provided a cleaning device for wire lines and cables used in well operations which is simple in construction, easy to operate, light in weight, provides maximum cleaning elnciency and which imposes minimum drag and tension on the wire line or cable as it is drawn therethrough, resulting in maximum preservation of wire lines and cables and equipment used in connection therewith, and permits more accurate recordation of data secured in well logging operations.

' We claim:

1. In a device of the class described, a frame; a pair of wheels, each being rotatably mounted on an axle carried by the frame; a resilient cleaning element disposed about the rim of each wheel; said cleaning elements having coinciding channels on the outer sides thereof arranged to form an embracing passage about a line drawn between the wheels; one of said wheels being pivotally mounted to the frame; an operating handle; an adjusting nut attached to the axle of the pivotally mounted wheel, one end of the said handle being threadedly engaged with the adjusting nut; means to prevent longitudinal movement of the handle upon rotation thereof; 'and means for pivotally mounting the handle with reference to the frame, whereby the pivotally mounted wheel may be moved toward or away from the other wheel by rotation of the handle, and the pivotally mounted wheel may be shifted toward or away. from the other wheel by longitudinal movement of the handle.

2. In a device of the class described, a frame; a pair of wheels, each being rotatably mounted on an axle carried by the frame; a resilient cleaning face extending about the outer periphery of each wheel; said cleaning faces having coinciding channels thereabout arranged to form an embracing passage about a line drawn between the wheels; one of said, wheels being pivotally mounted to the frame; an operating handle; an adjusting'nut attached to the axle of the pivotally mounted wheel; one end of the said handle being threadedly engaged with the adjusting nut; means to prevent longitudinal movement of the handle upon rotation thereof; and means for pivotally mounting the handle with reference to the frame, whereby the pivotally mounted wheel may be moved toward or away from the other wheel by rotation of the handle, and the pivotally mounted wheel may be shifted toward or away from the other wheel by longitudinal movement of the handle.

3. In a device of the class described, a frame; a pair of wheels, each being rotatably mounted on an axle carried by the frame; a resilient cleaning element disposed about the rim of each wheel, said cleaning elements having coinciding channels on the outer sides thereof arranged to form an embracing passage about a line drawn between the wheels; one of said wheels being pivotally mounted to the frame and the other said wheel being fixed with reference to the frame; an operating handle; an adjusting nut attached to the axle of the pivotally mounted wheel, one end of the said handle being threadedly engaged with the adjusting nut; means to prevent longitudinalmovement of the handle upon rotation thereof; a link pivotally mounted to the handle at one end and pivotally carried about the axle of the fixed wheel at the other end, the pivotal connection of said link to the handle being arranged to go over center in two positions with reference to the pivotal connection between the link and the axle of the fixed wheel, whereby the pivotally mounted wheel may be moved toward or away from the fixed wheel by rotation of the handle, and the pivotally mounted wheel may be shifted toward or away from the other wheel by longitudinal movement of the handle.

4. In a device of the class described, a frame; a pair of wheels, each being rotatably mounted on an axle carried by the frame; a resilient cleaning element, disposed about the rim of each wheel, said cleaning elements having coinciding channels on the outer sides thereof arranged to form an embracing passage about a line drawn between the wheels; one of said wheels being pivotally mounted to the frame and the other said wheel being fixed with reference to the frame; an operating handle; an adjusting nut attached to the axle of the pivotally mounted wheel, one end of the said handle being threadedly engaged with the adjusting nut; means to prevent longitudinal movement of the handle upon rotation thereof; a link pivotally mounted to the handle at one end and pivotally carried about the axle of the fixed wheel at the other end, the pivotal connection of said link to the handle being arranged to go over center with reference to the pivotal connection between the link and the axle of the fixed wheel when the pivotally mounted wheel is shifted into contact with the fixed wheel, whereby the pivotally mounted wheel may be moved toward or away from thefixed wheel by rotation of the handle, and the pivotally mounted wheel may be shifted toward or away from the other wheel by longitudinal movement of the handle.

about the outer periphery of each wheel; one of said wheels being pivotally mounted to the frame and the other saidwheel being fixed with reference to the frame; an operating handle; an adjusting nut attached to the axle of the pivotally mounted wheel, one end of the said handle being threadedly engaged with the adjusting nut; means to prevent longitudinal movement of the handle upon rotation thereof; a link pivotally mounted to the handle at one end and being pivotally supported at the other end with relation to the frame, the pivotal connection of said link to the handle being arranged to go over center in two positions with reference to the pivotal connection between the other end of the link and its pivotal support, whereby the pivotally mounted wheel may be movd toward or away from the fixed wheel by rotation of the handle, and the pivotally mounted wheel may be shifted toward or away from the fixed wheel by longitudinal movement of the handle. 7

6. In a device of the class described, a frame; a pair of wheels, each being rotatably mounted on an axle carried by the frame; a resilient cleaning face extending about the outer periphery of each wheel; one of said wheels being pivotally mounted to the frame and the other said wheel being fixed with reference to the frame;

an operating handle; an adjusting nut attached to the axle of the pivotally mounted wheel, one end of the said handle being threadedly engaged with the adjusting nut;

means to prevent longitudinal movement of the handle upon rotation thereof; a link pivotally mounted to the handle at one end and being pivotally supported at the other end with relation to the frame, the pivotal connec-' tion of said link to the handle being arranged to go over center with reference to the pivotal connection between the other end of the linkand its support when the pivotally mounted wheel is shifted into contact with the fixed wheel, whereby the pivotally mounted wheel may be'moved toward or away from the fixed wheel by rotation of the handle, and the pivotally mounted wheel may be shifted toward or away from the other wheel by 1011- gitudinal movement of the handle.

References Cited in the file of this patent UNITED STATES PATENTS 1,485,435 Shenk Mar. 4, 1924 2,552,921 Anderson May 15, 1951 2,651,959 Harrington Sept. 15, 1953 2,703,423 Hunt Mar. 8, 1955