US1576652A - Pipe-threading machine - Google Patents

Description

March 16. 1926.

L. S. HALL PIPE THREADING MACHINE 4 Sheets-Sheet 1 Filed 001;. 23. 1923 INVENTOR L5Llf ,5. HALL BYIS ATTRNEY March 16 1926.

L. S. HALL PIPE THREADING MACHINE Filed 00%. 23. 1923 4 Sheets-Sheet-Z Q Q Q 1 1 INVENTOR Lax/5 HALL TOR f March 16 1926'. 1,576,652

| s. HALL PIPE THREADI NG MACHINE Filed Oct. 25. 1923 4 Sheets-Sheet 5 LESL/ES. HALL flu; 4

A ORNEY March 16 1926.

L. S. HALL PIPE THREADING MACHINE Filed Oct. 23. 1923 4 Sheets-Sheet 4 INVENTOR LESL/f 5. HALL BY )5 g 10% EY I Patented Mar. 16, 1926.

UNITED STATES LESLIE S. HALL, OF

1,576,652 PATENT OFFICE.

BRANTFORD, ONTARIO, CANADA, ASSIGNOR TO WILLIAMS TOOL CORPORATION, OF ERIE, PENNSYLVANIA.

IPIPE-THREADING MACHINE.

Application filed October 23, 1923. Serial No. 670,236.

To all whom it may concern:

Be it known that I, LESLIE S. HALL, a subject of the King of Great Britain, and a resident of the city of Brantford, Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in a Pipe-Threading Machine, of which thefollowing is a description, reference being had to the accompanying drawings, which form a part of this application.

My invention relates to pipe threading machines and particularly to that type in which means is provided for the automatic recession of the chasers or thread cutting dies, to cut a taper thread on thework.

More specifically my invention has to do with an improved die head and control means therefor.

The shortcomings of the present type of machines of the character referred to, are many. My invention contemplates the elimination of these shortcomings, and presents a multiplication of novel, useful, practical, and highly desirable feaures both from the standpoint of the manufacturer and the operator of pipe threading machines.

Generally, the object of the invention may be said to be the provision of a machine which is extremely simple of construction, easy of operation, safe, accurate, and positive in its action, and embodying features and improvements which render it highly desirable to the trade.

' One object-is to provide a die head and control mechanism therefor which is self contained and assembled as a single unit, thereby adapting the same to practically any pipe threading machine now on the market.

Another object is to simplify and reduce the movements necessary in running a machine of this character.

A further object is the arrangement of the control mechanism in a manner to permit the operator to see at a glance the positions of all working parts, without changing his position.

A still further and important object is'the provision of a double cam control for the recession of the chasers whereby threads of two different tapers may be cut by a simple change operation.

It is also an object to provide clear, plain, and simple indicating means for the various lengths of threads to be cut thereby eliminating guess work and insuring perfect operation and control even by an inexperienced operator.

Another object is the provision of suitable adjustments for the various parts, allowing for wear, etc.

A further object and special feature is the arrangement of the control for the movement of the head on its guide ways, whereby movement of the control means and of the head is always in the same direction.

Other objects and advantages will be apparent as the description proceeds, reference being had to the accompanying drawings wherein like reference characters indicate like parts.

Figure 1 is a side view of'my improved machine showing in general the organization of the parts.

Figure 2 is a front view of the die head and controlling means therefor, parts being broken away for clearer illustration of the construction and operation thereof.

Figure 3 is a side View of the die head, parts of the control mechanism being removed for clearness.

Figure 4 is a detail view showing the cam control for taper guide.

Figure 5 is another side view, parts being broken away, showing the method of travel of the carriage on the ways of the bed.

Figure 6 is a front detail of the cam plate showing in some detail the construction and operation of the chasers, parts here also be ing broken away for clearness in illustration.

Figure 7 is a detail sectional view taken on the line 7-7 of Figure 6, looking down, showing the connection between the cam plate and the controlling mechanism.

Figure 8 is also a detail sectional view showing the manner in which the thrust bar -of the control mechanism is guided.

Referring now more specifically to the figures the reference number "1 indicates the body of the machine which carries the chuck 2 rotatably supported in bearings 3; the driving element 4, control levers 5, change speed control 6, oil tank 7 a pivoted dumping pan or hopper 8 for catching the out tings, a tool box 9, and the bed 10 of the machine. These elements are not shown in detail in this application as they are not included specifically in the invention claimed herein;

Formed on the bed 10 are guideways 11 Eel which slidably support a carriage 12. Baffie plates 13, integral with the carriage, provide protection for the operator from splashing oil, etc.

Rigidly mounted on the carriage 12, as by bolts 14, is the head constructed to receive the end of a pipe 16 mounted for rot-ation in the chuck 2. Slidably mounted in radial grooves 17 in the front face of the head 15 (see Fig. 6), are chaser holders 18 carrying chasers or thread cutting dies 19 which are removably and adjustably secured to said holders and adapted to be adjusted to ipe engaging position in a manner about to e described.

Extending thru the center opening 20 in the head 15 is a flanged ring 21 secured to the head as by bolts 22. The flange 23 extends outwardly from said head and at right angles thereto, and on the bearing formed on said ring between the flange and the face of the head is rotatably mounted a cam plate 24. The rear face of this plate 24 is provided with cam grooves or channels 25 shown in dotted lines in Figure 6. Guided in these cam grooves 25 are headed pins 26 carried by the chaser holders 18. It will be readily seen then that rotation of the cam plate 24, and consequent movement of the cam grooves 25, results in a sliding movement of the chaser holders radially with respect to the center opening 20, into which the pipe 16 is inserted to be threaded.

Closure caps 27, removable by the use of a special tool, not shown, provide easy access to the headed pins 26, which when removed, permit the withdrawal of the holders 18' thru openings 28 provided in the periphery of the head. A handle 29 on the periphery of the cam plate 24 provides means for manually rotating the cam plate. Means to be described is also provided for the automatic rotation of the cam plate 24 as the cutting progresses, thus causing a gradual recession of the chasers 19 and cutting a tapered thread on the work.

Secured, as by means of bolts 30, to the side of the carriage 12 is a bracket or other support 31 which carries the controlling unit for the head and carriage.

One of the slideways 11, adjacent the bracket 31, carries on its outer lower face a rack 32 extending practically the length of the bed. Mounted in suitable bearings 33 in the bracket 31 is a shaft 34 cariyingat its inner end a pinion 35. Adjacent and parallel to. shaft 34, and also suitably journaled in bearings in the bracket 31 is a short stub shaft 36 carrying at its inner end a pinion 37- meshing with pinion and with rack 32. The shaft 34 has keyed thereto, at 38, a hand wheel 39 by means of which said shaft may be rotated, and by virtue of the double pinion connection with the rack 32 and the bracket connection with the carriage 12, it

will be readily seen that rotation of the hand wheel 39 results in movement of the carriage and head on the ways 11 in the same direction as the hand Wheel is rotated. Conversely, it will be seen that upon movement of the head and carriage along the ways 11, due to the threading operation after the work has begun, the shaft 34 will be rotated. It wil be noted in this connection that since the control mechanism is carried by the carriage, said carriage and said control mechanism move together and both are at all times directly in front of the operator manipulating the control.

Loosely mounted on the shaft 34 is a sleeve 40 which carries at its inner end a disk 41 provided on its inner face with one or more cam grooves 42. The outer end of the sleeve 40 is provided with a hand wheel 43 by means of which said sleeve and said cam disk may be manually rotated. This hand wheel 43 carries an inwardly projecting stop piece 44 adapted to engage with an adjustable stop screw 45 mounted in the path of said stop piece 44 by means of an upstanding lug 46 carried by the bracket 31. The rotation of the hand wheel 43 is thus adjustably limited.

A look handle or wheel 47 is screw threaded upon the outer end of shaft 34 and when tightened thereon serves to frictionally lock the hand wheel 39 and the hub 48 of hand wheel 43 together, whereby rotation of one imparts rotation to the other.

Suitably mounted in the bracket 31, and bearing against disk 41, (see Fig. 2), is a small, slidable spring pressed plunger 49 provided with a tension adjusting screw 50, the device forming a friction'brake or drag on the disk 41 and preventing accidental or undue rotation thereof.

A connection is provided between the rotatable cam disk 41 and the cam plate 24 whereby rotation of one imparts rotation to the other. This connection is in the form of a thrust bar 51 provided at its lower end with a roller 52 which rides in one of the cam grooves 42 in the disk 41. This thrust bar extends upwardly, guided thru the bracket 31 on three sides by means of a channel 53, (see Fig. 8), and on the fourth side by the face 54 of the carriage 12. I

A bolt 55 presses thru the thrust bar at its upper end, (see Fig. 7), and slidable on the inner end of this bolt 55, between the thrust bar and head 15, is an eye bolt 56, the shank of which extends at right angles to the bolt 55. Mounted upon the shank of the eye bolt 56 is a sleeve or bushing 57 upon which swivels a piece 58 having connection with the cam plate 24 by means of V extension 59 engaging in a corresponding V slot 60 in the rear edge of the cam plate 24. A clamp plate 61 with a lip 62 overhanging the face of cam plate 24, and a nut 63, serve to clamp and hold the piece 58 in its adjusted position on the cam late 24. Such adjustment is made by first oosening the nut 63, grasping the handle 29 on the cam plate and turning the same thereby to'the desired position, (pipe engaging position of the chasers 19), and then locking said nut 63 again. An indicator member 64 mounted on the head 15, points to indicating numbers 65 on the edge of the cam plate, for showing the operator at a glance and without changing his position the correct setting of the chasers for the desired size of pipe, in the manner just described.

It will be readily understood therefore, that movement of the thrust bar 51, up or down, will result in rotation of the cam plate 24 and consequent radial movement of the chasers. It will also be understood from the foregoing that due tothe lock wheel 47 and the frictional engagement between the hand wheel 39 and the hub 48 of hand wheel 43, the cam disk controlling the chaser holders may be selectively rotated manually, independent of the movement of the .carriage, or automatically rotated by the movement of the carria e.

The cam disk 41 is bevelled at its edge, as

at 66, such bevelled edge carryingindicat ing characters 67 which are visible to the operator through a window or sight opening 68 in the bracket 31. A fixed pointer 'or other suitable indicator 69' is secured to the bracket 31 centrally of the sight opening, and past which the indicating numbers 67 pass. B means of this indicating arrangement the operator can always see at a glance and without-changing his position'at the control mechanism, the progress of the work for any given size of pipe, degree and length of taper being cut, and the exact moment to release the dies from their cutting. This is a distinct advantage for guess work is eliminated and an experienced o erator is unnecessary in the running of t e machine.

Preferably two of the cam grooves 42 are provided in the disk 41, one having a curvature which, acting thru its thrust bar connection with the cam plate, causes a thread of a standard taper to be cut on pipe of desired sizes. The second groove permits a thread of a different taper to be cut on pipe requiring. a special taper, such as casings, etc.

Each groove is provided with an outlet 70 in the edge of the disk 41 so that by turning the disk until the desired outlet is at the top, it is a simple operation to lift the thrust bar roller out of one groove and into the other, thus almost instantlv setting the control for a new taper cut. The advantage of this arrangement is obvious.

The hand wheel 71 controls the V centering blocks, (not shown), slidingly mounted on the back of head 15 for steadying the pipe during the reaming and cutting off operations. The hand wheel or lever ,72 controls the cuttingoff tool, (also not shown), carried by one of the aforementioned centering Vs. The lever 73 controls the reaming tool, (not shown), mounted adjacent the cutting ofi' tool. These parts 'donot form a part of the invention clalmed in this application and are therefore not shown in detail.

The operation of the machine and parts described is as follows:

The operator having a length of pipe to be threaded, first loosens the nut 63, and by means of handle 29 sets the cam plate in the proper position for that particular size of pipe. The indicator 64 and 65 shows him at a glance when the setting is cor- 'to the die head control or disk 41. The carriage is then moved forward by means of the hand wheel 39, which also causes the cam disk 41 to rotate, thereby startingthe chasers to recede b means of the thrust bar connection with tile cam plate. The pipe is, of course, rotating and as soon as the chasers have taken enough'hold on the pipe to pull the head forward theoperator may release the hand pressure on the wheel 39 and let the carriage feed forward itself.

As soon as the indicating numbers 67 on the disk 41 representing the size of pipe being cut appear op osite the pointer 69 in the window 68, a nil length of thread has been cut, with a taper controlled by the cam groove 42. The operator should now release the lock lever or wheel 47 and rotate the hand wheel 43. This will then release the' chasers from the pipe and also open the head suflicient to allow the pipe to pass thru without touching the chasers. The operator can now try his fitting, cut off the pipe, or perform any other operation necessary.

Change from one taper to another is almost instantaneous. The cam disk is simply revolved to the farthest point possible on that cam, and thethrust bar and roller which operates in the cam can be lifted clear of the disk and dropped into the other groove.

It will be seen that the control mechanism for my new head is self contained and made up as a unit. This enables the application of the desirable features of the control to practically all pipe threading malength of thread to be cut, and the taper is all figured out and marked in large plain figures under the eye of the operator, leaving no operation to his udgment. It is not necessary to look in the front to see when the pipe is taking hold. Neither is it necessary to look into the rear to see when the proper length of thread has been out, which is sometimes very hard to do owing to the fact that cuttings and dark oil often cover up the pipe and make it impossible to tell exactly when a perfect thread has been cut.

The adjusting screw 45 allows for wear on the parts and permits accurate work at all times.

From the foregoing it will be readily understood that I have devised a machine.

which is novel, useful, practical, highly efficient, and a distinct advance in the art to which it pertains. Of course, the exact form shown and described herein is to be taken as illustrative only, for obviously the various parts are susceptible to various changes and modifications without departing from the scope of the invention. I do not wish to be limited therefore, to the form shown, other than by the appended claims.

I claim 1. In a threading machine, a movable carriage thereon carrying a head, slidable chaser holders in said head, means for imparting movement to said head, rotatable means connected to and operated by said carriage moving means for controlling the movement of said chaser holders, and means for operating said rotatable means independent of the carriage moving means.

2. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a rotatable disk provided with a cam groove carried by said carriage for controlling the movement of said chaser holders to a predetermined degree, and connections between said cam groove and said cam plate.

3. In a threading machine, a slidable cariiage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a rotatable disk provided with a cam groove carried by said carriage for controlling the movement of said chaser holders to a predetermined degree, and connections between said cam groove and said cam plate, and means independent of said rotatable disk for manually operating said cam plate.

4. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a rotatable disk provided with ,a cam groove carried by said carriage for controlling the movement of said chaser holdeisto a predetermined degree, and connections between said cam groove and said cam plate, and means whereby movement of said carriage results in movement of said chaser holders, said last named movement being automatically controlled by said rotatable disk.

5. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a single unit of mechanism carried by said carriage compris ing; means for moving said carriage, means for automatically and manually controlling the movement of said chaser holders, and means for locking said two last named means together, whereby movement of said carriage results in movement of said chaser holders controlled by said control means.

6. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a rotatable disk on said carriage for controlling the movement of said cam plate, and means in said disk for selectively controlling such movement to a plu rality of predetermined degrees.

7 In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a rotatable disk on said carriage for controlling the movement of said cam plate, and means in said disk for selectively controlling such movement to a plurality of predetermined degrees, said means comprising a plurality of cam grooves, and connecting means between said grooves and said cam plate. v

8. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a bracket on said carriage, carrying a rotatable disk for controlling the movement of said cam plate, a thrust bar connection between said disk and said cam plate, said thrust bar being guided through a channel in said bracket.

9. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a rotatable disk on said carriage provided with a cam groove for controlling the movement of said cam plate to a predetermined degree, a thrust bar connecting said cam groove and said cam plate, said thrust bar having a roller at its lower end for engaging in said cam groove.

10. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in saidhead, a cam plate on said head for imparting movement to said chaser holders. a rotatable disk on said carriage provided with a plurality of cam grooves, a thrust bar adjustably secured at one end to said cam plate and provided with a roller at its opposite end for selective engagement with one of said cam grooves, whereby the movement of said chaser holders is controlled to a selected predetermined degree.

11. In a threading machine, a slidable carriage thereon carrying a head, a slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, rotatable means carried by aaid carriage for controlling the movement of said chaser holders, a connection between said rotatable means and said cam plate, and a friction tension brake bearing on said rotatable means.

12. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a bracket on said carriage supporting a rotatable controlling means for the movement of said cam plate, means on said bracket for rotating said rotatable means, and a stop means on said bracket for limiting such rotation.

13. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a bracket on said carriage supporting a rotatable controlling means for the movement of said cam plate, means on said bracket for rotating said rotatable means, and an adjustable stop means on said bracket for limiting such rotation.

14;. In a threading machine, a slidable carriage thereon carrying a head, slidable chaser holders in said head, a cam plate on said head for imparting movement to said chaser holders, a bracket on said carriage supporting a rotatable disk for controlling to a predetermined degree the movement of said cam plate, said disk having a bevelled edge and indicating characters thereon.

LESLIE S. HALL.

Images