US1796703A

US1796703A - Pipe puller

Info

Publication number: US1796703A
Application number: US203833A
Authority: US
Inventors: Frank G Carrington
Original assignee: FERRIC ENGINEERING Co
Current assignee: FERRIC ENGINEERING Co
Priority date: 1927-07-06
Filing date: 1927-07-06
Publication date: 1931-03-17
Anticipated expiration: 1948-03-17

Description

March 1931- F. G. CARRINGTON 1,796,703

PIPE FULLER Filed July 6, 1927 F 6. OWE/award Patented Mar. 17, 1931 UMTEDSTATES PATENT OFFICE FRANK G. GARRINGTON, ANNISTON, ALABAMA, ASSIGNOR TO FERRIC ENGINEER- ING COMPANY, OFANNISTON, ALABAMA, A CORPORATION OF DELAWARE PIPE FULLER Application filed July 6, 1927. Serial No. 203,833.

This invention relates to a centrifugal casting apparatus and more particularly refers to a device for extracting a cast pipe from a mold.

Most of the pipe pullers heretofore used have required a cessation in the spinning of the mold. It is extremelv desirable that the mold continue its rotation throughout a working period. The molds are subjected to an uneven cooling circumferentially, which, if the molds are stationary, results in their warpage. However, if the mold isconstantly rotated, each circumferential segment of the mold is subjected to the same cooling as every other segment, and there is consequently no greater expansion atone point on the molds periphery than at any other.

Those pullers that may be operated while the mold is rotating contact with the castingat only one point on the circumference. As

the casting cools there is an attendant shrink age, which causes the pipe to rest on the bottom of the mold. Such pullers have consisted in an arm that extends within the mold and raises the casting from the base of the mold. When the casting is thus freed from contact with the mold, the arm may be withdrawn, or

the mold moved away from the castin It is obvious that a puller of this type afiords an insecure engagement with the casting.

None of the devices heretofore used for the extraction of a cast pipe have made provision for warpage of the mold mentioned above. This warpage causes a gyration of a rotating mold, and, in the absence of appropriate provision, materially diminishes the efficiency of the puller. This gyration of the mold and casting calls for a flexible joint in the pulling arrangement in order that the puller may gyrate with the mold without loosening. Provision is also required for an even distribution of force on the circumfen ence of the pipe. Without this there will be economical of construction and subject to facile operation, that engages a casting at more than one point on its circumference.

A further object is to provide a puller that is capable of grasping and extracting a pipe without ceasing rotation of the mold.

A. still further object of this invention is to provide an apparatus for removing a cast pipe from a warped mold.

To accomplish the above objects, and others equally important as will appear herein, my invention in general comprises a flexibly mounted support member, members integral with the support member adapted to contact with a cast pipe, and means to permit a misalignment of the axes of the mold and pulling apparatus. a i

For the purpose of better illustrating my invention, but wishing it to be clearly understood that it is susceptible to various modifications in structure and details without exceeding the scope of the appended claims, reference is made to the accompanying drawlngs in which similar numerals indicate the same parts.

Figure 1 is a longitudinal view in section of a mold, casting and core, and an elevational view of a pipe pulling apparatus;

Fig. 2 is a cross sectional view along the line 22 of Figure 1 looking in the direction of the arrows;

Fig. 3 is a view along the line 33 of Figure 1 looking in the direction of the arrows;

Fig. 4 is a detail view of a pipe engaging member, showing its mounting upon the support member.

I have shown in Figure 1 a mold 1 suitably mounted for rotation by means not shown in the drawings. \Vhile this mold is provided with a bell, it is to be noted that my invention maybe employed with equal efficiency with a mold of the plain type. Inserted in the mold is a head core 2, which is held in position by suitable fastening means not shown. The core fasteners should be adapted to be removed while the mold is rotating. If the mold is not of the belled type, a plain end ring, or core, is employed.

Molten metal is poured in the mold while rotating, and, upon solidification, :forms a pipe 3. This pipe at the bell end of the mold takes the form on its outer periphery of that portion of the mold, and on the inside takes the shape of a shouldered portion 4 of the core 2. An annular protuberance 5 on the shoulde'r'of the core prevents a longitudinal movement of the bell end of the casting with respect to the mold.

As the molten metal cools there is a shrinkage inthe casting. By reason of" the shape of the bell'end'of the mold, and'the shoulder of the core, the bell end of the pipe remains stationary, and the shrinkage is taken up at the opposite end 6 of the casting. There therefore is left a space 7 between the plain end of the casting and the plain end of the mold. Even should a plain end mold be em-' ployed, thereis' a shrinkagewhich creates a space between the ends of the casting and the mold, either at one end or the other,'or perhaps at both ends. a i

The casting is removed by clamping'on the face ofthe casting a gripping device, and

either pulling the device from the mold, or

al lowing'the device to remain stationary and moving the mold away from it.

The pipe pulling apparatus shown in the accompanying drawings comprises a support member or rod 8'of sufhc'ient length to extend in the mold; Mounted'on one end of the rod 8 is a block 9 secured to the rod by means of a screw or other suitable means 10 as shown in Figure 4.

Also set in the block}? are resilient members 12 These are secured in the block by lugs 11 shown in Figure 4, or other suitable While I have shown two such re-' means. 811181113" members, it is tobe understood that a greater number may be employed The resilient members have a tendency tospring outwardly. As shown in Figures 1 and 4c, the members 12 are tapered, both in thickness and width, toward their seat in the block 9;

On the free end oft-he resilient members 12 are lips 13 integral with the members. These lips taper from the members 12, as more clearly shown "in Fig. 1,: which facilitates their gripping the casting. 'Even though there is aslight shrinkage, and there afgrip on. the end of the casting. Ais the casting' i-s withdrawn-, affording a larger space, thelips then; further extend across the casting until stopped by the outer surface of the members 12, and thus the entire contact surface of the: lip is in engagement with that the" free end of the" lips are rounded,

describing an arc o'fiazcircle that is concentric with. the diameter of the pipe. This also insures a maximum gripping surface for the lips.

On the end of the'rod '8 remote from the block is a rotatable joint 14 comprising a casing 16 in which the rod is set, and rotatably secured in the 'casinga member 17 in which the-cable 15 is held. The joint 14 permits a rotation of the rod 8 with the casting, while the cable 15 remains rotatably stationary.- The cable 15, is wound upon a drum 18 providedwithend plates 19 to prevent the cable from slipping off of the drum. The end plates 19 are'securely mounted upon a shaft 21,-:whi-ch provide the rotative force to the drum. The rod 8 and cable 15 should be of considerable length to insure a more nearly uniform pull on the twoarms 1'2, and also to reduce the angular movement of the cable, when the mold is warped.

VVhi'le I have shown a' casting apparatus in which the'mold remains stationary while the pulling device is withdrawn therefrom it is obvious that the cable 15 might be sepressed together'only until the lips have passed within the outsidefacing of the core 2, after which, the members may be allowed to spring apart. Although the lipswill bear upon the core and casting when'sprung, if the. metal has sufiiciently hardened they may be pushed to the remote endwithout scratching the inner surfaces of the core or casting. The; resilient property of the memhere 12 should be such that there will always be a tendency for them to spring apart, but should not be so marked as; to dig into the core or metal, or even to such an extent as'to material ly impede the movement-of the device from the bell to the plain end.

. Therod 8-is further inserted until the lips 13}have reached the plain and of the casting. At that time they will spring further apart and rest in the cavity 7. When a proper force is exerted on the rod- 8, the lips 13, engaging asthey do the face of the cast-- ing, pull the'pipe and core from the mold.

As above stated, either the cable may be wound upon the drum or the mold may be moved axially. 7 During the whole process the mold continues torotateateither the same, or reduced, speed; The joint 14 permits the puller to rotate with the mold while the cable 15 remains rotatably stationary.

While I have shown the preferred embod- 1 iment of my invention, it is apparent that many alterations may be made in the structure herein shown and described without departing from the scope and spirit of the appended claims.

I claim:

1. A method of casting pipe comprising pouring metal in a rotating mold, inserting in the mold a pipe puller, effecting engagement between the plain end face of the cast pipe and the puller, and withdrawing the pipe while the mold is rotating.

2. A method of centrifugally casting pipe comprising pouring metal in a rotating mold, inserting in the mold a pipe puller, engaging the puller with the plain end face of the pipe, and withdrawing the pipe, bell end first while rotating the mold.

3. A method of casting pipe comprising pouring metal into a mold, retaining one end of the casting in fixed relation to the mold to cause the other end to separate from the mold upon shrinking of the casting, engaging a member with the end of the casting separated from the mold, and withdrawing the casting.

4. In a centrifugal casting apparatus having a rotating mold, a core fixed at one end of the mold and means for engaging a casting for preventing longitudinal movement thereof, a device having resiliently mounted lips adapted to engage the other end of the casting and means to withdraw the device and the casting from the mold.

5. A device for removing pipe from a mold comprising a support member, means to engage an end face of the pipe while the mold is rotating, and means for removing the member and pipe from the mold.

6. A pipe puller for removing pipe from a mold comprising a support member, means carried by the support member for engaging the spigot end face of the pipe while the mold is rotating, and draft means for pulling the member and pipe from the mold.

7. A pipe puller comprising a support member, resilient means carried thereby to engage the end face of the pipe, and draft means attached to the support member.

8. A pipe puller comprising a support member, resilient means carried by the support member to engage the spigot end face of the pipe, and means connected with the support member for pulling the member and pipe from a mold.

9. A pipe puller comprlsmg a support member, resilient means carried by the support member, and engaging elements carried by said resilient means for engaging an end face of the pipe, and draft means attached to said support member.

10. A pipe puller comprising a body portion, resilient arms carried by said body portion, the free ends of which are normally spaced apart a distance greater than the internal diameter of a ipe to be removed from a mold, means on t e free ends of said resilient end means to engage the end portion of the pipe.

11. A pipe puller comprising a support member, draft means connected to said support member, and means carried by the support member to grip the pipe at the end remote from the end at which the pipe puller is inserted.

12. A pipe puller comprising a support member, means adapted to engage the spigot end face of the pipe, means integral with the engaging means for mounting the same on the support member, and means for withc drawing the support member and pipe from a mold.

13. A pipe puller comprising a support member, a block mounted on one end of the support member, outwardly projecting resilient members seated in the block, lips on the free ends of the resilient members, and tractive means connected with said support member.

14. A pipe pulling device comprising pipe engaging dogs resiliently mounted, adapted to grip the end face of the pipe, and tractive means connected with the dogs for pulling the pipe.

15. A pipe puller comprising a support member, spring-like members on the support member, lips on the ends of the spring-like members adapted to engage an end face of the pipe, and flexible draft means attached to the support member.

16. A pipe puller comprising a draft bar, flexible arms on the end of said bar, lips on the ends of said arms adapted to engage an end face of a pipe.

17. A device for removing pipe from a mold comprising a rod insertable in the mold, arms carried by the rod, said arms having their ends shaped to permit them to be easily inserted within the pipe, barbs formed on the ends of the arms adapted to engage the end face of the pipe, and means for withdrawing the device and pipe from the mold.

18. A pipe puller comprising a support member, resilient means carried thereby to engage the end face of the pipe, and draft means swivelly attached to the support member.

In testimony whereof I afiix my signature.

FRANK Gr. OARRINGTON.