Dec. 24, 1946. f ‘A. 1.. FORBES, JR: - 2,413,103 EXPANDING HEAD ‘ Filed Oct. 26, 1944 1o E52. 34 4 " a?” 3 Sheets-Sheet 1 37-. Dec. 24, 1946. ' A, l__ FORBES, JR ’ 2,413,103. EXPANDING HEAD Filed Oct. 26, 1944 3 Sheets—Sheet‘ 2 Hm. '24, 1946. A. L. FORBES, JR 2,413,103 EXPANDING‘ HEAD Filed Oct. 26, 1344 3 Sheets-Sheet 6 1 Patented Dec. 24, 1946 2,413,103 UNITED: STATES PATENT OFFICE 2,413,103 EXPANDING HEAD Arthur L. Forbes, Jr., Houston, Tex., assignor to Pressure Weld Company, Houston, Tex., a cor poration of Delaware 1 Application October 26, 1944, Serial No. 560,473 2 Claims. (Cl. 113-103) This invention relates to an expanding head, particularly adapted for use in the process of designated as the frame of the head and, of course, may be varied in speci?c construction. welding pipes together. Around this frame are the shoes 6, four of said The head has been particularly designed for shoes being shown. They are of arcuate shape, use in the construction of pipe lines whose sec 5 their outer surfaces being curved to conform to tions are welded together. the desired inside contour of the pipe-that is, Another object of the invention is to provide the outer surfaces of the shoes, when the head an expanding head of the type described which is expanded, are of a cylindrical contour. is adapted to be located within the adjacent ends _ Each shoe has a plate like web '1 which ex of the pipes to be welded together and which in 10 tends radially inwardly between the plates of the cludes means for expanding the head against said frame as more accurately shown in Figure l. adjacent ends so that the ends will be brought to The frame plates have the marginal register perfectly round shape, if out of round, in order ing slots 8 and 9 as shown in Figures 1 and 4. that the ends to be welded together will per The slots 8 are somewhat wider, and extend some fectly register. A further object of the invention resides in novel means for expanding the head. It is a further object of the invention to pro vide, in a head of the character described, re 15 what further radially inwardly, than the slots 9. The webs ‘I also have the marginal slots III which register with the slots 9. Fastened to the webs '! on opposite sides of the slots I0 thereof and extending outwardly through tractable stops provided to accurately locate the 20 the slots 8 are the pairs of lugs II, II, the lugs head with respect to the joint between the pipe ' of the respective pairs being spaced apart. Tog sections with means for retracting the stops upon gle links I2 have their outer ends pivoted between initial expansion of the head. the respective pairs of lugs II and have their With the above and other objects in view the inner ends pivotally connected to a. hub I3. This ‘ invention has particular relation to certain novel 25 hub is ?xed on a plunger rod I4 whose inner features of construction, operation and arrange ment of parts, an example of which is given in this speci?cation and illustrated in the accom panying drawings, wherein end slides through the bushing 4 and a strong coil spring I5 surrounds said rod and is inter posed between the frame and the hub I3 and normally holds the hub outwardly thus holding Figure 1 shows a longitudinal, sectional view 30 the shoes 6 inwardly or in retracted position. of the head. The hub I3 and spring I5 are surrounded by a Figure 2 shows an enlarged, fragmentary, sec housing I I5 which may be .bolted to the frame and tional view of the pressure applying means for whose outer end is formed with a central bear_ retracting the stops and expanding the head. ing through which the plunger rod I4 works. Figure 3 shows an end view of the head. 35 The housing I6 has suitable side slots I’! through Figure 4 shows a sectional view taken on the which the toggle links I2 may work. line 4—4 of Figure 1; and - Fastened to the outer end of the housing I6 Figure 5 shows a plan view of the head located there is a cylinder I8 within which there is a in the pipe line and shown in active, or expanded, plunger I9 connected to the outer end of the position. 40 plunger rod I4. Connected into the outer end of Referring now more particularly to the draw the cylinder l8 there is a suitable pressure line ings, wherein like numerals of reference desig 20 through which a pressure ?uid such as oil nate the same parts in each of the ?gures, the may be admitted into the cylinder I8. numerals I and 2 designate inner and outer plates Upon application of pressure to the plunger I9 which are arranged concentric. There is a tu 45 it is obvious that it will be forced inwardly over bular nipple 3, concentric with and extended coming the pressure of the spring I5 and operat through both plates. It is welded to the plate ing, through the toggle links I2, to_expand the 2 and extends through and beyond the plate I. shoes of the pressure head. Its extended end is outwardly threaded. A tu Bolted, or otherwise secured, to the frame plate bular bushing 4 is extended through the nipple 50 I, there is a, hood 2| which surrounds and en and is screwed onto the threaded end of the closes the'corresponding end of the bushing l nipple and is formed with a head which abuts and the plunger rod I 4. the outer side of the plate I. Around the nipple Fastened to the innerend of the hood 2I there and between the plates there is an annular spacer is a cylinder 22 reciprocable in which there is 5. The ‘ parts hereinabove referred to may be 55 a plunger 23 and fastened to this plunger and 2,418,108 3 4 surrounding the outer end of the cylinder 22 there with a circumferential groove 40 to provide space is a cap 24 having an outwardly extended inner . for the up set material. The pressure fluid may be supplied from any end ?ange 25. Connected into the inner end of the cylinder 22 there is a valve housing 26 having an inlet suitable source. When the pressure is relieved the spring I5 will force the plunger I9 outwardly passageway 21 which is controlled by the inlet valve 28 normally held closed by a pressure spring 29. A line 30 leads from the outer end of the cyl or in the reverse direction thus acting through the toggle links I2 to withdraw the shoes 6 in wardly and thus contract the head and the pull inder I8 and is connected into the inlet passage of the springs 31 will move the plunger 23 in wardly of its cylinder 22 thus forcing the pressure way 21, as shown in Figure 2. The inlet pas sageway 21 also forms a relief passageway which is controlled by~the relief valve 30a. The pur pose and operation of these valves will be here inafter more speci?cally explained. ?uid back through the duct 21, past the relief valve 30a and through the branch line 30b and back through the line 30. The head may then be withdrawn through the On opposite sides of the slots 9 and secured to 15 added section 39 until it is in the same relation the frame plate I are the pairs of arms 3|, 31 to said added section, as is shown in Figure 1 and more accurately shown in Figures 1 and 3. The another section added as before. The pressure arms of each pair are spaced apart and pivotally line 20 may be ‘used for withdrawing the head mounted between them are the stop members 32, and this line may be either a pipe or a hose of shown more accurately in Figure 1. These stop 20 sufficient strength for the purpose. members are curved outwardly through the slots The head is provided with a carriage to facili 9 and I0 and their outer ends projected through tate its withdrawal through the added section 39. corresponding openings 33 in the shoes 6, and for This carriage includes the rear wheels 4I mounted the stops 34 whose forward sides are beveled, as between the arms 3I _as well as the front wheels shown in Figure 1. Formed integrally with the 42 which are mounted between the forwardly pivoted ends of the stop members 32 are the arms extended arms 43 which are anchored to the front plate 2 of the frame. 35 which extend radially inwardly and whose inner ends engage behind the ?ange 25 as shown What I claim is: in Figure 1. These arms are connected to the , 1. An expanding head for registering the adja hood 2I by means of the yieldable members 36 30 cent ends of aligned pipes to be welded together and the ?ange 25 is connected to said hood by the and for reshaping said ends, if distorted, com yieldable members 31. These yieldable members prising, a frame composed of concentric plates, 36, 31 are preferably in the form of coil springs. means for ?xing said plates in spaced relation, a Normally the spring I5 will hold the shoes 6 series of expanders mounted to move radially on retracted, or in their inner position, and the the frame and having curved outer faces arranged springs 36 will hold the stops 34 outwardly or in to move simultaneously into contact with the in active position. The head may be inserted into side of the pipe ends, upon‘outward movement the end of the pipe line 38, or other pipe to which of the expanders, said faces when expanded de a section is to be welded. The stops 34 will engage ?ning an approximately cylindrical contour, webs the end of the pipe line so as to regulate the dis 40 ?xed to the expanders and extending radially in tance of insertion. As is indicated in Figure 1 wardly between the plates, means responsive to the shoes should be inserted about one-half of the pressure of an operating ?uid for moving the their length into the pipe line. The section 39 expanders outwardly to move said faces into con to be welded on may then be brought into align tact with the inside of the adjacent pipe ends ment with the section 38 and its end, adjacent the and means for moving the expanders inwardly pipe line, or section, 38 moved over the shoes 6 to released position upon relief of said pressure. into the position indicated in dotted lines in 2. An expanding head for registering the adja Figure 1. Pressure may then be ‘applied through cent ends of aligned pipes to be welded together the line 20 into the cylinder I8 and this pressure and for reshaping said ends, if distorted, compris will pass also through the branch line 30b. The ing, a frame composed of approximately concen spring 29'may be made of any desired strength, tric members, means for ?xing said members in usually it is of a strength to require about ?fty spaced relation, a series of expanders mounted to pounds pressure to open the valve 28 and admit move radially on the frame and having outer pressure intoithe cylinder 22. This initial pres faces arranged to move simultaneously into con sure will operate through the toggle links I2 to 55 tact with the inside of the pipe ends upon out cause the shoes to contact the opposing ends of ward movement of the expanders, said faces when the respective pipes 38 and 39 and will force the expanded de?ning an approximately cylindrical plunger 23 and cap 24 outwardly thus acting contour, webs ?xed to the expanders and extend through the arms 35 to retract the stops 34. The ing radially inwardly between said members, section 39 may then be forced into direct contact radially movable retractable stops on the head 60 with the end of the pipe line 38 by a pipe welding which extend out beyond the head when the ex machine, or other appliance, adapted for the pur panders are in their inner position, means re pose and as the pressure in the cylinder I8 is sponsive to the pressure of an operating ?uid for further built up the shoes will be further ex moving the expanders outwardly to move said panded and will bring the abutting ends of the 65 faces into contact with the inside of the adjacent pipes into perfectly round shape, if out of round. pipe ends, means for automatically retracting The abutting ends may then be welded together said stops upon such movement and means for by the application of heat from the welding ma moving the expanders inwardly to released posi chine referred to. When the weld is completed tion upon relief of the pressure. the ends of the pipe welded together will be slightly up set inwardly and the head is provided 70 ARTHUR L. FORBES, JR.