US1813419A - Elbow lathe - Google Patents

Description

- H. PARKER ELBOW LATHE July 7, 1931.

Filed March 12, 1929 4 Sheets-Sheet l July 7, 1931. PARKER 1,813,419

E BOW LATHE Filed March 12. 1929 4 Sheets-Sheet 2 fllllllll lllllll H. PARKER 1,813,419

ELBOW LATHE Filed March 12 1929 '4 Sheets-Sheet 3 H. PARKER ELBOW LATHE July 7, 1931.

Filed March 12 1929 4 Sheets-Sheet 4 1 2 (%/%m 47 kw Patented July 7, 1931 UNITED STATESQPAFTENT- OFFICE HOWARD PARKER, OF BERLIN, NEW HAMPSHIRE, ASSIGNOR T30 BROWN COMPANY, OF

I BERLIN, NEW HAMPSHIRE, A CORPORATION OF MAINE ELBOW LATHE Application filed March 12, 1929. Serial No. 346,478.

This invention relates to mechanism for truing the ends of pipe elbows and shaping these ends to fit a threaded, tapered, or other kind of coupling, as desired. The apparatus ll hereinafter described is more especially intended for use in operating on elbows of fiber tubing or conduit such for example as is made by winding up a web of wet cellulosic fiber ona mandrel until the desired wall thickness is obtained, then removing the tube thus formed from the mandrel, and drying the tube. The dried tube may then be treated with a waterproofing compound such as pitch, this resulting in a tube which is relatively light in weight, but strong. The ends of the tube sections may bem achined toreccive corresponding couplings. Some of the tube sections may be bent, while wet,

I into elbows of various angles. In machining the ends of an elbow to receive; couplings, it is important that the en dsbe properly aligned with the adjoining conduit sections to avoid undue stresses at the joints. To this end I provide a pair of end-trimming mechanisms carried by a supporting frame so as to operate about axes which bear a definite angular relation to each other. Suitable means for supporting an elbow for trimming may also be carried by the frame.

Various additional advantageous features of structure will be apparent to one skilled in the art from the description of the invention which follows hereinafter, and from the drawings, of which,-

Fi 'ure 1 is a plan view of mechanism emb bodying the invention. 1

Figure 2 is a side elevation of the same. Figure 3 is an elevationof a portion of the mechanism from a different direction.

Figure 4; is a section on line 1-4 of Figure 3. v

Figure 5 is a section on line 55 of Figure 6. i

Figure 6 is a section on line 66 of Figure 5.

Figure gearing. g

Figure 8 isa PltLIl VlQW of transmlsslon gearing for driving one of the cutter heads. Figure 9 is a'sideelevation of the same.

7 is a sectional view of adjustment Figure 10 is a section on line. 101() of Figure 8.

Figure Figure 8.

Figure 12 is a fragmentary section of a mechanism controlling the reversing and stopping of cutter heads.

Figure 13 is a section on Figure 12.

Figure 14 is an end elevation of a cutter head for operating on the exterior surface of a tube.

Figure 15 is a side elevation of the same, a portion being shown in section.

Figure 16 is an end elevation of a cutter head for operating on the exterior surface of a tube.

Figure 17 is a side elevation of the same.

Referring to thedrawings in detail, 20 represents a bed having the general shape of a quadrant. At one side of this quadrant is an extension 21 of the bed on which is mounted a frame 22. Atthe other end of the bed 20 is a secondframe 23 which is carried by an arm 24 pivoted as at 25, this pivot being at the center of the quadrant formed by the bed 20. The frames 22 and 23,.as shownin Figure 1, may be arranged so that their long axes are perpendicular to one another. The frame 23, however, can'be swung. on the pivot 25 so that the axes of the frames may be adjusted to any angle from 90 to 180. 7

On the frame 22 may be mounted a cutter head 26, a similar cutter head 27 being mounted on the frame 23. These cutter heads may be driven in any desired manner; As shown on the drawings, the cutterhead 26 is rotated as by an electric motor 28,'a similar motor 29 being provided to drive the cutter head 27. The cutter heads 26 and 27 are preferably so mounted that their axes of operation are respectively parallel to the axes of the frames 22 and 23.

In order to provide for quick movement of the cutter heads along their axes toward and from the work, each cutter head together 11 is a section on line 1111 of line 13-43 of with its driving mechanism may be mounted on a longitudinal slide 30, which is provided witha rack 31 and may be controlled as by a suitable hand wheel 32. The cutter heads are each adjustable in'a horizontal plane to operate on elbows of different lengths. To this end the slide 30, as shown, is slidably supported by a transverse slide 33 which slides transversely on a standard 34, the standard 34 in turn being adjustable longitudinally on the. franre 22. Thepositions otthe slides and be adjusted as by atra nsverse screw threaded member 35 and a longitudinal screw threaded member 3.6. The screw 3.5 is carried by the slide 34 andengages an internally threaded lug 37 which is carried by the slide so that rotation of the screw 35 motes the slide 33 laterally of the frame 22. In like manner the screw 36 is carried by the franie 22' and engages an internally threaded lug carried by the standard 34 so that rotation of the screw 36 results in longitudinal adj usting movement of the standard 34 and the mechanism carried thereby.

'In order to em itate the rotation of the screws 35 and 36, Iinayproyide simple gearing such as is illustrated inFigu re'7, this gearing comprising a gear 38 which meshes with a pinion 39, the latter being fixed to a short shaft 40 having a squared end 41to receive tin operating crank. The gears 38, 39 may be enclosed in -a suitablecasing 42to protect them from dust and dirt. 3 Similarly on the frame 23 the cutterghead 27 may be mounted'on a slide 30 which is'longit-udinally movable as by a raclr 3 1 and an operating wheel 32-, the slide 30 being supported by a transverse siide 33 and a standard 34,whi oh are respectively adjustable as by screws 35 and 36 in the'samem anner as hereinbefore described. Y i

In order to support the worlr securely in proper "position for. o-perat-ipn, I provide withthecutter headsa pair of clamps each of which is p e ferably adjustable in a plane perpendicular tothe axis itsa'djacent cutter headso as toengageelbows of any diameter within the range of the mechanism. As shown in Figure 2, the frame 22 have fixed at the forward end thereof suitable standard 43 on which :mounted a vertical slide 44, the height of which may be conveniently adjusted by a pair of screws 45 which may be'operatedby a ha'nd wheel 46 through suitable gearing 47. This vertical slide 44 carries a horizontal slide 48 which maybe horizontally adjustedthereen as by ascrew 49 rotatable bya handwheei 5Q. Manipulation o f the hand wheels 46 and5 0thus rnakes possible any desired adjustment oft-he clamp in a planeperpendicular to the axis ofropera; tion of the cutter head 26.

As shown in Figure 4, the worlrma y be clamped between the top'surfa'ce oft-he slide 44 and the under face of, aclamping memher 51, wh is mova le vertically w th espect to the slide 44. In order to effect a quick clamping action, the clamping. member 51 may be carried at the lower end-ofa stem 52 which is supported by a block 53. The

stem 52 may be provided with a shoulder against which a washer 54 may be pressed as by a spring 55 in such a manner as to press the clamping member 51 upwardly. In order to moye the ,clamp v 5,1 downwardly to clamping ras -i9 I m y pr dea memh 56 pivoted on a suitable pin 57 and adapted to bear on the upper end of the stem 52. An opera'tingrlever 58 may be fixed the clamp block 56 so that when the (block is swung through an angle of 90 the stem 52 is pushed downwardly thereby for a definite distance, thus forcing the member 51 downwardly into clamping engagement with a pipe thereunder.

A similar clamp may be mounted in front f th se t r h a 27- s own i Fig s 2 is lam may h a ri d by a standard '75, the pper face of this standard ng a t e l we aw of a' amp, f h ch e upper ja s Ope at v a t ted n Fi re 4, h s upp r jaw b n an e sely adjustable as by a hand wheel 50 which e a es a ew Th tanda d 7 may he v i a y adj s ed s by a v t cal s ew h he en Qf hich s mmmte a a le an W el 5 This c ew, eg th rwith e sta d may suerhr slon e h qh h y able Slide 77, w ch i tran e y adjust b by a h eeet l sc e .8 supported on the end of the frame 23 The ruh i e o the, c mp n ihhhhah sm may be dentical w th hat ill s r te i Fi 4 and described in detail. I

The block 53 is preferably mounted for ready vertical adjustment in order to accommodate pipes of difierent diameters. To

this end the slide 48,, which supports the amp, may a e a ti at 59, t re n Qn either side of this slot I provide a serrated surface 60 having teeth adapted to. engage with similar teeth in the rear face of the block 53. The block 53 may be clamped in adjusted position against the'serrated surface 60 as by a bolt 61 which passes through the slot 59 and through-a portionof the block 53. On the head of the bolt 61 is pivotally mounted a pair of ears 610, the edges of which form earn surfaces which bearoon the rear face of the slide 48. The ears61O may rotate on a pill 611 extending through the head of the bolt as by a handle63. V nut 62 on he. Oppos e d f h b lt 61 m y be adjusted so that movement of the ears 610 to the position shown in Figure 4 clampsthe block. 53 t gh ly ga n th er a ed ac 60. When the handle 63 is swung upward: ly, the' block :53 is atonce released and may be manually raised or lowered as desired When the mechanism as a whole isv in the position illustrated in Figure 1, it is ready to operate on a elbow, the axes Qfth Por ion ofxth te he d-s 2 n 27. 9 s a r g t g e It m y be desirab of the mechanism.

however, to trim and shape the ends of ;el-

the mechanism -to operate on elbows with angles of these sizes, the bed 20 may be provided with suitably located holes 64 to receive a locking pin 65 (Figure 3) so as to hold "the frame 23 securely in place when it has been swung on the pivot 25 to one of the standard angles.

The frame 23 and the mechanism carried thereby may be rotated to adjusted position as by an arcuate rack 650 with which engages.

a suitable pinion 66. As shown in Figure 5, the pinion 66 may be fixed to or formed on the end of a shaft 67 a ratchet wheel'68 being mounted on the upper end-of the shaft 67. Cooperating with the ratchet wheel 68 is a pawl 69 which is pressed against the wheel 68 as by a suitable spring 70. A .pin 71 extends through thepawl 69 and projects out from the housing'enclosing this portion The pin 71 works in a slot 7 2 whereby the pin and pawl may be retracted from the ratchet wheel 68. The housing 73 which encloses the ratchet Wheel 68 and in which the pawl 69 is mounted is also provided with a recess to receive a suitable handle 74 by which the ratchet may be rotated so as to swing the frame 23 around its pivot 25. As soon as the pin 650 has reached the desired hole 64, the frame 23 may thereupon be locked in position.

The cutter heads 26 and 27 may be each connected to their respective motors 28 and 29 by suitable gearing which is capable of automatically reversing and stopping. This 0 connecting gearing may be identical for both cutter heads so that a description of one will serve for both. Referring to Figures 8 and 9, the shaft 79 from the motor rotates a pinion 80 which meshes with a gear 81. i This gear is secured to a coaxial pinion 82 and is loosely mounted with it on a shaft 83. The pinion 82 meshes with a gear 84 loosely mounted on a parallel shaft 85 with a coaxial pinion 86 which meshes with a gear 87. A pinion 88 is coaxial with. and secured to the gear 87, both being loosely mounted on the shaft 83. The pinion 88 meshes with a gear 89 which is fixed on the shaft 85. Also mounted on the shaft 85 is a gear 90 which meshes with a gearof similar size mounted on the shaft 83 so that the train of gearing thus far described operates to drive the shafts 83, 85 at equal speeds in opposite directions. The shaft 85 terminates with the gear 90 and abuts a drive shaft 92 a portion of which-may be squared or splined to rotate a clutch member 93 axially slidable thereon. This clutch member is I adapted to engage a corresponding member on the face of the gear 90 so that when these 5 i i 6 members are engaged as shown in Figure 8,

.ing

the shaft 92 is rotated with the shaft 85. A portion of the shaft 83 may be squared or splined to rotate a clutch member 94 axially slidable thereon. This clutch member is adapted to engage a corresponding member on the face of a gear 95 which. is loosely mounted. on the shaft 83. The gear 95 meshes with a pinion 96 which in turn meshes with a gear 97 equal in sizeto the gear 95 and mounted on the shaft 92. Thus when the clutch member 94 engages the pinion 95, the shaft 92 is driven in the same direction as the shaft 83, this being opposite to the direction of rotation of the shaft 85. Suitable meansmay .be provided for sliding the clutch members 93, 94 into and out of engagement with their respective gears 90, 95, such operating means including a lever 106 which may be rocked. as by a handle 98.

The drive shaft 92 connects the cutter head mechanism with the transmission gear and is provided with a threaded portion 99 on which rides a nut 100having a downwardly extend arm 101 which slides on a pair of rods between adjustable abutments 103 and 104. The rods 102 are extensions of a rod which projects from the gear casing. During the re ation of the screw 99, the nut 100 travels in one direction. or the other until its arm 101 engages one of the abutments 103, 104 accordingto its direction of travel. Thereafter the rod 105 is moved endwise to rock the clutch shifting lever 106. This clutch lever has a downwardly projecting portion 107 which is longitudinally bored toreceive a plunger 108 behind which is a spring 109. The outer end of the plunger may be beveled as shown in Figure 12 and rests against a sloping shoulder 110 of acam member 111 which is adjustably secured to the bottom of the transmission gear casing. .T he inner end of the rod 105 is longitudinally bored to receive a plunger 112 behind which is a spring 113.} The spring113 tends to push the plunger 112 out of the bore, the plunger being retained therein as by a suitable pin 114. Opposed to the plunger 112 is a shorter plunger 115 carried in the end of a bridge member 116 and backed by a suitable spring 11'? which tends to press it in a direction opposite to the plunger 112. As shown in Figures 12 and 13 the plungers 112 and 115 are thus opposed to each other and press in opposite directions against opposite sides of the extension 107 of the clutch operating lever 106.

If the mechanism has started in operation from the position illustrated in'Figures 9 and 12,.the nut 100 travels toward the right until it reaches the abutment 103 whereupon its further travel pushes the rod 105 toward the right. Since the lower end of the plunger 108 rests against the cam surface 110, it will be necessary for the plunger 108 to ride upwardly thereon against the pressure of the spring 109 before the clutch operating lever lcexed *to a hollow shaft-123.

106 can be swung from the position shown in Figure 12. On account of the resistance offered by the spring 109 motion of the 1011105 at first causes compression of the spring 113 from contact with the opposite side of the extension 107 so that when the spring 113 is sufficiently compressed to overcome the re sistance of the spring 109, the plunger 108 rides up on the cam shoulder 110, whereupon the motion of the entending' spring 113 snaps the extension 107 toward the right until the lower end of the plunger 108 rests in a depression 118. The swing of the lever 106 from the position shown in Figure 12 to a position wherein the plunger '108 rests in the depression 118 is sufficient to disconnect the clutch and to connect the clutch '97 so that the rotation of the 'conn-ecti'ng'shaft 99 is automatically reversed and the nut 1'00 starts traveling toward the left. This travel continues until the'arm 101 of the nutengages the abutment 101 so as to'move the rod 105 toward thel'eft. This results in a-compres sion of the spring 117 which is shorter than the spring 113. WVhen the travelof the rod 105 toward the left is sufiicient to displace the plunger 108 from the depression 118, the plunger is only of sufficient length "to push the extension 107 far enough to the left for the plunger 108 to enter a'seco'nd depression 119. l Vhen the plunger rests in this depression, the lever 106 is in its neutral position, that is, neither clutch is engaged, hence the drive of the cutter head-automatically stops. thismanner, it *is only necessary to start the operation of thecutter head on each pipe end to be trimmed. Once star l ed thus, the cutter head will'travel the'full extent in one direction, will be automatically reverse-d so as to travel backto its starting point whereupon the rotation thereof will automatically stop. g

The cutter heads '26 and "27 are of a type designed to carry a tool around stationary work, the heads being adj u'stableso F that the tool will operate on pipes of difier'ent diameters. The cutter head shown ini'Figures 14 and 15 is designed for work-on exterior surfaces of pipe ends, this cutt'er beingad-apt ed to trim "the outer surface of the pipeend to a suitable taper. Themechanism by'wh ich the tool is carried is similar in principle to that described in detail in my=co pending= application Serial No. "136,784, "fi led September 21,1926.

The cutting head may he supported on a suitable bracket in which -is -"ournaled-'a suitablegear 121 fixed'tothesha H92. The gear 121 meshes with a gear 122 which is Gn th'e end of 65 this shaft is fix'ed 'atransverse ly extending arm 124 which is longitudinally slotted as at 125 to receive a bolt 126 'by which a suitable block 127 may be clamped in-adjustable position on the the arm 124 at theend remote from the slot 125 so as to counterbalance to some extent th'e'block 1 27 end the "tool carriage 129 carried thereby. 'The block 127 is provided with a slot 130 in-whiehthe tool carriage 1'29may travel, "the block heing so adjusted that the slot 130 is inclined with referenceto thedirection of the axis of rotation so that as the tool carriage 129 is fed thereal-ong,the tool cuts a conical-surface on -the end portion-of the work. By loosening the belt 126, the block 127 with the toolcarri-a gemaybe moved readily inwardly or outwardlycn the arm 124 to operate on workof different diameters.

In order "to f'acilitate the adjustment of the block 127 n'sui'taible abutment men'rber 131- may bemount-edthereon to engage the end of a rod 132 which is'seoured 'atdts further end to'the counterweight1'28.

As shownrin Figure 15, a face ofthe counterwei-g ht may begrooved as and a rack 131 bolted therein. A'hlook 135 having-teeth corresponding to th'e teeth '01 "the rack-134 may be bolted to 'the rack. The teeth of the rack l l are preferably-spaced by a nnit distance such as an inch so that-ea ch adjustment of the h-look on the inac'kim-u'st be 1a whole number of inches. Even 's'adjustment off-the rod 1 321ma "he made:aslbyaflznnnled nut 136 carried int-1e block 51 35vand iinthreaided engagementwith theulower portion ofthe rod 1%:2,'7th'is: portioniheingsslotted as iaitfi137vand 13111;:5Cl'10 prevent retatironwf the and in the bloc v :In setting vtheitool rbloclz 127,. iti1na-y be first moved radially outwardly, thenethe position of the rod unay 'be'iadjuste'cl according to the diaineterrof'the' work :to .be operated upon,"after which thebloc k1127anayibezmovetl inwardly until the abutment 131- engages the end of the rod132. The belt 126im'ay-thereupon beset np=ti ghtlylto clamp the IblOGk 12.7 in position onthe arnr12 t. ltotartion'of the arm 124rah'ouththeaaxisfiof theworkwvilt carry therew'i'ththe tool 138; sthi-s to ol being-remova'bly' fixed inaa ssu ita ble slide :139 which is ardju sta'b ly l alttached to "a downwardly projGCtllTg portion [140 oft-the tool carriage .129.

As ithe-rarm 12 1 swings "the tool carriage 1 29 'a bout theraxis ef the workgthe carriage maybe fed :along 't'h'e' s'li'de by 'a screw shat-b1 1 1w itli ufihichtlre carrtage isrin threaded' 'errgagem'entr :The screw shaft 141 is rotated by ia-"su i-tzible train of1'gears f142, =-143, 144 and 1 15. -Thei"gears:l42, 143 and 144 are mounted in :a suitable casing :146 which is adaptedtotswvi ngias :a unit around the axis of the 'work togetlier' with the mm 124. "The gear 'll t5,'lhowever, is fixed against rotat'ion by being keyed *onotlrer-wise secu-red'to the am 124. A suitable counter weight 128 may be formed'on orsecured to casing which forms a part of the bracket 120 so that as the housing 146 revolves around the axis, the gear 144 has a planetary motion about the stationary gear 145 and is ro tated thereby, this rotation being transmitted to the gear 143 and thence to the gear 142, the feed shaft 141 being connected tothe latter. The housing 146 is provided with a suitable slot 147 in its side walls so that when the block 127 is moved radially inwardly or outwardly, the gear 142 is also moved an equal amount by the shaft 141. A pair of suitable plates 148 extend loosely around the shaft 123 and the bearing shaft of the gear 144 so that the gear 144 is retained in meshing relation with the gear 145 for all positions of the casing 146. Since the gears 142, 143 and 144 are all ournaled in the casing 146, their relative position is thus'maintained constant so that the gear 142 is maintained in operative relation for the gear 145 for all positions of the housing 146. Thus as arm 124 carries a cutting tool 128 about the work, this tool may be fed by the feed shaft 141 which is driven through the gear train as described.

Figures 16 and 17 illustrate a similar cutting head except that the tool carriage 129 supports a slightly different type of tool holder 149 on which is mounted a suitable tool 150 adapted to trim the inner surface of the work. Since the taper on the inner surface is opposite from that on the outer surface, it will be observed that the angle of travel of the carriage shown in Figure 17 is different from that of the carriage shown in Figure 15. The mounting of the tool carriage on the arm, the means for adjusting the tool carriage radially, and means for feeding the tool carriage along the work may be all identical with those described hereinbefore in connection with the cutter head illustrated in Figures 14 and 15.

In operating on an elbow, the frame 23 may first be fixed at the desired angle with reference to the frame 22, a right angle being shown in Figure 1. The standards supporting the cutter heads and their driving mechanisms may then be suitably adjusted so as to be properly spaced from one another. The

work holding clamps may then be adjusted if necessary so that the centers of the ends of the Work will be suitably alined wit-h the axis of rotation of the tool. In order tocenter the cutting heads to the ends of the work, each cutting head may be backed off by manipulation of the hand wheel 32. If the cutter head is for operation on the outer surface of the work, as in Figure 15, a centering cone 151 may be mounted on the forward face of the arm 24, this cone being held in place as by a stem 152 which enters the open end of the hollow shaft 123. The hand wheel 32 may then be turned to advance the cutter head until the end of the cone 151 enters the work and properly centers it. Thereupon the variavs adj stable parts at the mechanism are suitably adjusted sothatthe cutter heads are properly alined with their respective clamps. The cutter heads may then be backed ofi topermit the removal of the centering cones, whereupon theheads are again advanced to operative position.

If the cutter head isdesigned for operation on the inner surface of the work, a centering cone 153 may be mounted in such a way as not to interfere with the tool holder 149. As shown in Figure 17 the cone 153 may be supplied with an offset stem 154 adapted to slip into a recess in a boss 155 formed on the counterweight 128.

Having thus described an embodiment of this invention, it should be evident to those skilled in the art that various changes and modifications might be made therein without departing from its spirit or scope as defined by the appended claims.

I claim:

1. Apparatus of the class described comprising a pair of cutter heads for trimming the ends of a pipe elbow, means for revolving each cutter head around an axis, means for supporting the cutter heads with their axes intersecting, means for clamping a pipe elbow from above and below at points adjacent to the ends thereof, each clamp being vertically,

adjustable relatively toits respective cutter head.

2. Apparatus of the class described comprising a horizontal bed, a vertical pivot thereon, means for supporting a pipe elbow with its curvature approximately concentric with the axis of said pivot, a cutter head mounted for operation on one end of an e1- bow thus supported, and a second cutter head swingable about said pivot and mounted for operation on the other end of said elbow.

3. Apparatus of the class described comprising a. horizontal bed, a vertical pivot, a pair of frames adjustable with respect to each other about said pivot, a cutter head on each said frame revoluble about a horizontal with its ends aligned respectively with the aXes of revolution of said cutter head.

4. Apparatus of the class described comprising a horizontal bed, a vertical pivot thereon, a frame fixed to said bed, a cutter head mounted on said frame revoluble about an axis perpendicular to a radius from said pivot, means for adjustably moving said cutter head along its axis and horizontally at right angles thereto, an arm extending horizontally from said pivot and swingable thereon, and a second cutter head carried by. i

said arm.

5. Apparatus of the class described comprising a horizontal bed, a vertical pivot thereon, a frame fixed to said bed, a cutter head mounted on said frame and revoluble reheat a han out-a1- a is an. a m twi gele about said pivot, said arm being parallel to but Qfiset f om a rad us f the P a 1 1 second frame and cutter head carried by seidl arm, said second cutter head being revoluble about a horizontal axis perpendicular to said radius,

In testimony whereof I have aflixed my signature.

HOWARD .PARKEB--

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