US1544059A - Method of casting pipe - Google Patents

Description

June 30, 1 925.

Original Filed Sept. 16, 1922. '7 Sheets-Sheet l June 30, 1925. f-@

D. B. DIMICK METHOD OF CASTING PII'E Original Fled Sept. 16, 192,?, 7 Sheets-5heet June 30, 1925. 1,544,059

D. B. DIMICK METHOD OF CASTING PIPE Original Filed Sept. 16, 192? 7 Sheets-Sheet :3

June 30, 1925.

D B. DIMICK METHOD CF CA sTING PIPE Original Filed Sept. 16,- 1922 7 Sheets-Sheet 4 Ov M @lll l lil Ml. A E 7 0o 2 0.o ..0 9 M M N .J

June 30, 925.

D. E. DIMICK METHOD OF CASTING PIPE Original Filed Sept. 16, 1922 7 Sheets-Sheet 5 June 30, 1925.

D. B. DIMICK METHOD 0F CASTING PIPE Original Filed Sept. 16. 1922 7 Sheets-Sheet 6 janipl 17mm 11F Stilo/ump.

June30,` 1925.

- D. B. DIMICK METHOD OF CASTING PIPE Original Filed Sept. 16, 1922 7 Sheets-Sheet, 7

Patented .lune 3i), 1925.

UNITEEESTATES PATENT QFFICEQ.

DANIEL BAKER DIMICK, yF BIRMINGHAM, ALABAMA,

renner-'ton on CASTING PIPE.

Original application filed September 16, 1922. Serial No. 588,649. Divided and. this application led January 22, 1924.

To @ZZ cir/wm 'it n: f1.3/ concern application is a division ot my prior copend- Y ter to lil ing application ihled September 1.6, 1922. Serial No. 588.649.

rllhe invention `relates to improvements in method tor casting pipe in Which the article produced isa relatively thin seamless metallic cast'pipe possessing all ot the commercial acventapjes ot corrugated sheet metal pipe but costing only a small 'fraction ot the eipenseentailed in the manufacture ot the sheet metal product. f

The article .prodnced bj7 the present'iinc proved method is ,n =re particularly de scribed and-clarified in mjy co-pending application .tiled oit even date herewith.. Serial hl umher 5385650.

is an' object ot the present invention to produce a simple. ei'iicient and ii'iethofl 'tor metal pipe wherein the -c malv be cheaply produced in large #nd with a minimum ot labor.

,f cts t the invention consists proving the mold.y the pattern and the in iinethod ot applying and removing the pattern and in conducting the other steps and processes ottho method by which the corrugated cast iron pipe is secured.

The pipe is preterabiv castv without bell or spigot ends or in other Words, is a plain, uniform corrugated cylinder which is `ioined together byfan improved union also described andclaimed in my oo-pending application aforesaid.

lith the foregoing and other objects in view. the invention will be more fully de-v scribed hereinafter. and will be more particularly pointed out in the claims appended hereto.

ln the drawings, wherein like: symbols rete or corresponding parts through out the views reliable Serial No. 687,868.

Figure 1 is a side elevation of an im-v proved casting machine constructed according to the present invention.

Figure 2 is a similar vien7 with parts shown in section and with pattern in a raised position.

Figure 3 is a top plan view of the appa` ratus. i

Figure 4 is a horizontal section taken on the line 4 4 in Figure 1.

Figure 5 also a horizontal section taken on the line 5 5 in Figure 2.

Figure 6 is a plan vievv of the mold showingthe pattern therein.

lFigure 7 is a vertical section taken on the line '-i' in Figure 6.

Figure 8 is a cross section taken on the line @-8 in Figure 7.

Figure 9 is another plan vieiv of the mold showing the pattern still in place and With the strippinnl appliance.

Figure 10 is a vertical .section taken on the line 10-10 in Figure 9.

Figure l1 is a transverse section taken on theline 11--1.1'in Figure 10.

Figure 12 is a vertical section through the .mold after the pattern has been removed andv the pouringI core has been placed thereon.

Figure 13 is a plan view ot the same.

Figure 14 is a plan view ot' the internal stripping ring.

Figure l5 shoivs a section taken diametricalljyY therethrough on the line 15e-15 in Figure 14.

Figure 16 is a plan View of the outer stripping ring.

Figure l? is a central section taken on the line 41,7--17 in Figure 16.- y

Figure 18 show-s a vertical section through u noditied Jform of mold, and

Figure 19 is a horizontal section taken ou Jthe line 19-19 in Figure 18.

Referring rmore particularly to the draiv ings, 1 designates the frame Work of the machine which is mounted upon a suitable bed or Jfoundation and carries a head 2 ,over7 hanging the mold, the outer jacket or cope of which is indicated at 3. The mold also has an adequate support to enable it to be held beneath the over-hanging head 2 of the machine, during the operation of pre.- paring the mold for the casting operation.

The pattern is represented at 4 kand is a spirally corrugated cylinder' adapted to 'enter theme16. as shown in Figure 7 and lio to be lifted from'the sand, after it has iinposed the necessary formation thereon, by

unscrewing the pattern and lifting it outr as indicated in Figure 2. The source of power from which this lifting movement is secured may be the electric motor 5 1nstalled upon a platform 6 within the frame 1 and having :av-driven bevel pinion 7 in mesh with a. horizontally disposed bevel gear wheel 8 made fast on the vertical shaft 9 which is appropriately ournaled 1n a suitable number of bearings in the frame work or adjacent parts. l

Upon the upper end of the shaft 9a which projects above the top of the frame is a pinion 10 meshing with a gear wheel 11 which is keyed to a sleeve 12 carried in a bearing 13 reinforced by the webs 14 of the frame and head. The sleeve 12 rotates freely about a shaft 15 extending-down parallel with the drive shaft 15. A. clutch head 16 is carried upon the lower end of the sleeve 12 and is adapted to engage with a complemental clutch collar 17 keyed slidingly on the shaft 15 as indicatedl at 18 and movable up and down by its connection with a lever 19 pivoted at 20 and having a slot 21 at its free end engaged slidingly by a crank pin 22 upon an upper sheave 23 which is located within the head of the machine and receives a belt or operating cord 2a. The cord extends downwardly and about a lower sheave 25 turning about the center 26 carried also in suitable journals of the frame.

The belt or cord 2a is furnished with rings 27 and 28 or the like adapted to be encountered by a lug carried upon the vertically sliding frame 3G. This frame is of a construction as best seen in Figure l and it is also a skeleton frame having .lateral arms 31 at its base adapted to slide upon the vertical guide bars 32 held by the brackets 33 in spaced relation to the inner side portion of the frame 1. rlhe frame r1 also is supplied .withV a bracket '3a in which the lower end of the shaft 15 is stepped. The major portion of the shaft 15 is screwthreaded and-is provided with a longitudinal key-way. in which the pinion 35 is slidably keyed as shown in Figure 5, beingpermitted thereby to slide up and down upon the shaft 15 but being compelled to rotate therewith. The pinion 36 ineshed witha gear wheel 37 keyed to the sleeve 38 internally threaded and engaged with the threads upon the pattern shaft 39 which is also parallel with the shaft 15. and it is suspended from the head `2` in any suitable manner, for instance projecting up through a bearing 40 and having ra plate 41 wider than the shaft and engaging upon the top of the head about the bearing,` the- Vplate 41V being held in place by a screw rod 42 and a nut 43 thereon. The sleeve 38 is reduced at'its upper Vportion and is receivedin the A-frame` 30. The A-frame also carries stirrups L4 at its side near its `base extending pattern 4. These flanges are bolted together.v

Now the head 4:6 carries hinged bolts 47 at its lower end adapted to swing into the radial open slots 48 produced in the flange 49 on the top of the pattern as shown in Figure 6. The pattern is thus removably `supported from the head and is lowered into the mold 3 when the A-frame descends. and is turned upwardly out of the sand when the A-frame is lifted.

The flange 49 of the pattern is also provided with slot-s 50 in suitable numbers having cross sockets 51 adapted to receive the T-heads 52 upon turn-buckles which have catches 54 on their opposite ends adapted to take beneath the flange 55 of the outer mold shell or cope 3. j

The base of the outer jacket 3 is provided with an out-turned flange 56 perforated to receive. the pins 57 projecting upfrom the casting stool 58. The pins provide for centering the cope upon the casting'stool and the casting stool is also preferably provided with a bottom perforated flange v59 to receive pins projecting up from the jolter table to properly locate this stool and the mold thereon and to restrain any lateral movement of the casting stool on the jolter table while the mold is being jolt-rammed by the yaction for instance of a pneumatic jolter. The core or arbor 60 is in the form of a thin frusto-conical shell 60 having a bottom head 6l secured thereto as by riveting and provided with a ring flange perforated to receive the positioning pins 62 on the casting stool 58. The arbor is thereby caused to assume a proper relation with respect to the cope. These pins 62 also avoid any tendency of the arbor to rotate when the pattern is screwed out of the finished mold.

It is seen that the cope 3 is also of frustoconical form being narrower at its top `in order to economize in the use of the sand, which is indicated at 63 and fills up the space between the arbor 60 and eope'3. The sand 63 after being properly treated with the sea coal and facing in accordance with the usual foundry custom is filled in at opposite sides of the pattern 4 and assumes the spirally corrugated form of the pattern. v It will be noted that the flange 55 of the cope 3is provided with a shoulder 64 to receive the ring 65 shown in Figure 10. This ring 65 co-operates with an annular channel ringl 66 forming an outer strip ring, the

outer flange of which is spaced from the outer ring 65 in orderl to provide a space Y head 71 ot the arbor. The inner stripping occupy the space ring also cooperates with an internal annulus 72 tittaing` Iin the shoulder depression ot the top arbor head 71, this annulus and the inner stripping ring being held in place and suitably apart by the vannular plate 73 and the clamp bolts 745, sand being made to The sand is handra-mmed into the space 67 and 75 and the top heads 71 ot the arbor is held to the 'casting stool as by a central bolt 76.

The stripping rings are shown more par` ticularly in Figures 14 to 17 inclusive and they each consist of skeleton plates. The internal ring continuous in one piece while the outer ring' is 'separable into two partsin order that it may be placed about theupattern. The inner ring is provided with 'a cavity 77' on its outer peripheral edges having` a dove-tail socket 78 in which the babbitt is directly cast. In a similar way'the inner flange of the outer stripping ring` provided with a cavityv 79 and a dove-tail socket 80 to receive the vexternal babbitt '81. `The dovetail slots provide for anchoring the babbitt securely in position and the mutuallyl adjacent facing of the babbitt are spirally threaded in accordance withlthe pitch ot the pattern in order that the pattern may be screwed forwardly therethrough. n

Referring more particularly to Figures 12 and 13,the pattern is shown as having been removed leaving` the mold cavity 82 into which the molten metal for forming the pipe is flowed through a top pouring core 83 which is channel construction in order to receive the molten metal in the trough 84 and to permit it to pass through the openings 85 into 'the mold cavity. The pouring core is put in place after the stripping rings are removed and is located by the core prints 67 and 75. n

ln carrying out the method the pattern 4 is first placed in the mold 3 while the mold occupies a position upon the table ot the jolt-ramming machine and suitably treated sand is poured into the spaces at opposite sides ot the core, the sand being replenished from time to time as the opera tion of joltramming proceeds. During this time the pattern is held securely in place by use of the turnbuckles or clamps 53. After this operation has been concluded the clamps are removed and stripping rings 66 and 70 are applied to the top of the mold or in other words the mold is put in thev condition shown in Figure 10. Head 46 is disengaged from pattern flange and run up while jolting takes place. The A-trame 30 is lowered to permit the bolts 41-7 ot the head 16 to en-v gage in the slots 48 ot the pattern ring' 49. lt will be understood that the shafts 39 `are chased with a thread the'pitch ot which agrees with that ot the corrugations in the pattern 4e while the threads upon the shaft r15 are only approximately one-third the aforesaid pitch or otherwise graduated with reference to the pitch upon the shaft 39 to agree with the ratio between the pinion 36 and the l`Q'ear wheel 37. The relative arrangement ot these various parts is such as to cause both the pinion and gear wheel to ascend with the A-frame 30.

Therefore after the pattern is suitably coupled to the apparatus the motor '5 is set in operation and through the pinion 7 and the gear wheel 6 rotation is permitted to the vertical shaft 9 and through the pinion lO to the gear Wheel 11, sleeve 12 and the upper clutch head 16. Now these parts may be lett running' constantly for it is only when the clutch is engaged that any movement will be communicated to the A-trame and to the pattern. The operator, for instance occupying the platform 6 opposite the motor is in a position to pull upon the cord 2li and thus rotate the sheave 23 causing the crank pin 22 to turn in the slot 21 and to raise the lever 19. The clutch collar 17 is thus elevated into engagement with the clutch head 16 whereby the movement ot the gear wheel 11 is transmitted to `the screw shaft 15. The stationary nut 115 carried by the A-trame 30 will thus be caused to travel up or down in accordance with the direction of movement o't the shatt 15 and in order to secure. movement in both directions the electric motor 5 is of the reversible type, and has variable speed control box.

Assume that the parts are in the position shown in Figure 1 and the rotation of the shaft 15 is in a direction to raise the nut 45. then a corresponding movement will be communicated to the A-frame by which the nut is carried and to the pinion 36 and a gear wheel 37 which are lifted in unison due to the relative pitches ot' the shatt 15 and 'and their relative speeds. The pattern il is thus raised and turned at the same time` securing' it outot the babbitt rings 79 and 81 which strips any sand attempting' to clin-gr to the pattern and the stripping rings avoid any dislocation or tendency of the top portion of the sand to be lifted out with the movement of the pattern.

When the pattern is wholly removed from the mold and when it substantially reaches the upper limit ot its travel, the projection 29 is timed to strike the upper collar 27 on theoperating cord 24 in order that the cord and the upper sheave 23 may receive a sutlicient movement to cause disengagement of Y the clutch. On the descending movement the projection 29 strikes the lowei' collar 28 and shii'ts the sheave also todisengage the clutch so that the stopping of the machine is automatic.

Now having removed the pattern, it re mains to place the pouring core 83 upon the top ofthe mold or in other words to place the mold in the condition shown in Figure 12. For this purpose the stripping rings are of course removed and theV sand prints 67 and 75 as aforesaid indicate where to place the core 83 in order that the openings- 85 may register' accurately with the cylindrical corrugated cavityY 82. The clamp plates 68 and T3 are useful in holding` the pouring core iii position. The hot molten metal or cast iron is poured into the trough Set and descending` through the openings 85 is molded in the cavity 82 into a spirally corrugated relatively thin walled castpipe having plain ends and imitating` corrugated sheet metal pipe both in appearance, strength and durability. After pouring` and while the pipe is still white hot and-.set the pouring core is stripped oft', bolt 76 released and over head cranes hook on toand pull the entire core arbor out of the mold; the pipe thus shrinks in cooling without meeting` resistance, and prevents `interval stress being set up in its wall structure. The mold is dismantled after the molded pipe has set and the parts are then in position to repeat the operation.

The arrangement and ylisposition of the screw shafts 15 and 39 in combination with the driving gears develops 'a relatively great lifting power upon the pattern 4L, while the action is accurate and relatively quick to the end that the machine may have a large capacity and be able to produce the pipes in large quantities. Y

Referring more particularly to Figures 18 and 19, the jacket and stool are the same Vas shown in prior figures as is also the pat-k tern, but the arbor 200 is' made of an inverted frusto conical shape andprovided with slots 201 in its outer wall, these slots being shown as four in number and spaced at 90 degrees about the arbor. In these slots wings 201 engage, which are loose therein and project out to within substantially one-half.1 an inch of the core. At their bases these wings carry pins 202 which engage in elongated slots 203 in the stool. The wingsare: also `made with transverse pertorations 204e therein in order to receive thersand to bind the Vwings in position and 'is rammed or jolted around through. the ini` tial space through the pattern and the arbor.' Then screwing the spiral corrugated pattern out ot the mold a shearing oft' the sand about the arbor is apt to take place but the presence of the wings avoids this. Pins 202 normallyV rest in the outer ends of the slots 203 which permits the wings to creep inwardly when the core 204 is withdrawn. The 4mold is made and the pipe poured after withdrawal of the core in a manner already' described. Justl after pouring, overhead cranesl are arranged to pull the arbor 204 upwardly, leaving the four wings in the mold-l and goes in, the' wings are forced before it, the slots 203 allowing of this movement. There is therefore not setup in the walls of the pipeany internal stress by meeting resistance. i

It is obvious modifications may construction and design 'of the above specifically described embodiment of `this inven-` tion without departing 'from the spirit there` of,'such changes and modifications being restricted only by the scope of the following claims. Y

Vhat is claimed is:

1. The herein-described method of casting spirally corrugated metallic pipe, which consists in iinbedding a spirally-corrugated hollow pattern in sand, withdrawing said pattern by a simultaneous rotary and longi` tudinal motion, and pouring molten metal into the mold cavity so formed. y

2.' ,The herein-described method of casting pipe which consists-iii placing a hollow spirally-corrugated pattern in a mold in asubstantially. upright position, packing sand in the mold against both inside and outside walls of the hollow pattern, withdrawing said pattern from the mold by. a simultaneous rotary and longitudinal y motion, and pouring molten metal iiitothe mold cavity so formed. i

DANIEL BAKER DIMICK.

As the casting shrinks in cooling` `that various changes and. be made in the details of

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