US1544060A - Apparatus for casting pipe - Google Patents

Description

D. B. DIMICK V APPARATUS FOR CASTING PIPE June 30, 1925.

Filed Jan. 31, 1924 2 Sheets-Sheet 1 June 30, 1 925.

' D. B. DIMICK APPARATUSFOR cAsq-mq PIPE Filed Jan Patented June 30, 1925.,

UNITED STATE' 1,544.06 PATENT optics.

DANIEL BAKER button, or BIRMINGHAM, ALABAMA.

APPARATUS FOR CASTING PIPE.

Application filed- January 31, 1924. Serial No. 689,810.

same.

The present invention relates to improvements in apparatus for ca'stmg pipe, and conslsts in certain improvements over the apparatus illustrated and described in my copending application, Serial #588,649, filed September 16, 1922.

In the application aforesaid, the sand was jolt-rammed into the mold at opposite sides of the spirally corrugated pattern, but certain difliculties arose from this -method of ramming, consisting principally in the fact that it was found impracticable to properly ram the mold on the under sides of the corrugations. The more the mold was jolted, the greater was the tendency of the sand to travel downward from the under inner curved surfaces of the corrugations. On the top and on the sides of the corrugations, a perfect ram was secured, but upon the under portions, the sand was found to be soft. Various methods of silting in the sand during jolt'ing were experimented with without a great deal of success however.

This condition in the ramming of the mold is, however, successfully met by the process of sand slinging. A Beardsley sand slinger, which is a well known machine recently put upon the market, is employed, which has a capacity of approximately 1800 handfulls of sand a minute, and this device throws the sand into the mold with great rapidity, and I find in actual practice that this method is accomplished with the desired result so far as the uniform packing of the sand on the under sides of the corrugations is concerned.

Another object of the invention'consists in providing a flexible connection betweenv the driving head and the corrugated pattern instead of. the rigid connection as proposed in my prior application above referred to.

A further new development consists in providing the pattern with a number of .small pins distributed throughout a relatively short section thereof for the purpose of roughing the sand. It is found'that with the plain corrugated cylinder, the act of unscrewing this out of the sand leaves the sand in a highly slick or polished condition, so much so that the iron will not lay quietly against the polished, sand. The result has been that thebasting is more or less wormeaten or honeycombed.

With the foregoing and other objects in View, the invention will be more fullydescribed hereinafter, and will be more particularly pointed .out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is a side elevation with parts in I section showing an apparatus constructed in accordance with the present invention with a Beardsley sand slinger indicated in dotted lines.

Figure 2 is a side elevation, on an enlarged scale, of the pattern and driving head..

Figure 3 is a longitudinal section taken through the parts shown in Figure 2.

Figure 4 is a bottom plan view of the driving head.

Figure 5 is a cross section taken on the line 55 in Figure 3, and

Figure 6 is an enlargedfragmentary section taken through that portion of the pattern which contains the roughing pins.

Referring more particularly to the drawings, the apparatus is more particularly described in my copending application re ferred to above, and the illustration in Figure 1, together with the following description, will be adequate for the purpose of the present disclosure.

The frame of the machine is indicated at 7,'and an over-hanging head 8 is provided in which is carried the threaded shaft 9.

The nut 10 travels up and down upon theplete elongated cylinder adapted to fit down vertically into the sand within the mold indicated at 13.

The mold is carried upon a table 14 to which it may be afixed by the pins 15 or other appropriate means. The table 14: is

I provided at its underside with a bevel cirthrough a shaft 18 jonrnaled in an approcular series of teeth 16, which mesh with the drive pinion 17. ThlS latter pinion is turned priate part of the mechanism and being connected to a suitable source of power, such for instance, as an electric motor, which is preferably independent of the electricmotor dotted lines, and when ramming the mold,

19 which drives the. pattern up and down.

The Beardsley sand slinger is'indicated in a continuously cylindrical spiral cavity in the sand when removed, both interior and exterior walls of .whichare corrugated.

As above referred to, the method of sand slinging packs the sand .uniformly not-only on the tops and sides of the corrugations of the fpattern 11, but also on the underside.

thereo f The pattern is raised and simultaneously turned after the ramming'is com lete in order to screw it out of the cylindrical corrugated cavity in the sand produced by it This is accomplished by the mac ine through the driving head 12.

The to of the pattern 11 and the driving head 12 1s modified to some extent over like parts in prior application. -In' this case the 1 pattern is provided with a thickened collar portion 20, adapted to fit rather loosely within the inner and outer annular flanges or rin 21 and 22 upon the lower part of the driving head 12.' The.rings.21 and 22 of the drivmg head are reinforced at proper points, and at these points are made registering perforations 23 for receiving the ins .24, the pins passing in through the or orations in both the rings 21 and 22 an alining perforations inthe pattern collar 20. Preferably, only two pins at diametrically opposite points are inserted, and as aforesaid, there is a certain looseness in the fit of the collar within the rings. This securesthe very desirable result of permitting the pattern 11 to adjust itself to a correct position with respect to the mold and the sand therein, and, the mold will be unaffected by any variations in movement of the driving head or the shaft9. In thismanner, a; truer mold cavity is produced. I

Now, referring more particularly to Figures 3, 5 and 6, numerous 'or small steel picks 25 are shown as tted through a propriate openings made 'in the wall-of e pattern 11 and projecting be o d the interior wall thereof, where same are shar nail. These pins or picks are preferab y arranged in ofi-set or staggered rela-' tion, and they are placed at-only a small cylindrical section of the pattern 11, preferably a short distance up from the base of the pattern. The function of these pins is to rou h the slick or polished sand.

Int e operation of the device, the sand slinger is caused to throw in the sand to the mold about the pattern during the rotation of the attern on the table 14, which table'prefera ly rotates on ball'bearings and is very true. The table turns at the. rate of approximately eight revolutions .per minute. The compactness of the ram can be regulated in three ways, namely, speed of the revolving table, speed of the sand 'slinger motor, and rate of feed of sand'into the hopper of the sand slinging machine. It requires about two minutes to throw the sand into the mold to complete the operation. The entire operation is mechanical and a perfect ram on all parts of the corrugations or threads is obtained.

The pattern is then screwed upwardly and out of the sand, being driven by the pins 24.

' sand, and the lower section of the attern sand,

will tend to press back this roughe but it will not slick or polish it.

The-motors for lifting and lowering. the pattern and for driving the table are controlled by appropriate switches and control boxes, but as these form no part of the present invention, they are not illustrated.

After the prattern is withdrawn, the molten metal is pou ed into the mold, and a relatively thm walled continuously cylindrical corrugated cast pipe. is produced, all in a single operationwithout any joints.

It is obvious that various changes and modifications may be made in the details of construction and desi of the above specifically described em odiment of this 1nvention without departing from the spirit thereof, such changes andmodifications being restricted only by the scope of the ..followin claims.

Whatis' claimed is:

1. In an apparatus for castin pipre, a driving head and a continuously cy in ical'and corrugated taneously li ed and rotated out of a continously cylindrical cavity in the-sandin a mold by said dri head, and meansfor flexibly sup rting 0 pattern from said driving hea tically reciprocating and rotating head,

means for lifting and lowering and for rotating said head, said head provided with internally and externally spaced rings at its lower portion, a pattern having a con- 10 tinuously spiral corrugation therearound provided with a collar adapted to loosely fit in the space between said rings, said rings and collar having registering perforations at substantially diametrically op site points, and pins adapted to pass removably through said alined perforations for the purpose of flexibl head, ut causing said pattern to rotate and rise with the head.

- DANIEL BARR DIMICK.

supporting the pattern from the

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