US887757A

US887757A - Apparatus for making tubular sand cores.

Info

Publication number: US887757A
Application number: US37863307A
Authority: US
Inventors: William D Berry
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-06-12
Filing date: 1907-06-12
Publication date: 1908-05-19
Anticipated expiration: 1925-05-19

Description

No. 887,757: PATENTED MAY 19, 1908.

w. D. BERRY.

APPARATUS FOR MAKING TUBULAR SAND GORES.

APPLICATION FILED JUNE 12, 1907.

2 SHEETS-SHEET 1 WITNESSES. INVENTOR.

No. 887,757. PATENTED MAY 19, 1908. W. D. BERRY.

APPARATUS FOR MAKING TUBULAR SAND GORES.

APPLICATION FILED JUNE 12, 1907.

2 SHEETS-SHEET 2 WW /l 4 WITNESSES. awivfiiem VE 6-2 C Z774 WILLIAM D. BERRY, OF NEW BRIGHTON, PENNSYLVANIA.

APiARATUS FOR MAKING TUBULAR SAND COR/ES.

Specification of Letters Patent.

Patented May 19, 1908.

Application filed June 12, 1907. Serial No. 378,633.

To all whom it may concern:

Be it known that I, WILLIAM D. BERRY, a resident of New Brighton, in the county of Beaver and State of Pennsylvania, have invented anew and useful Improvement in Apparatus for Making Tubular Sand Cores,

. which is adapted for machine jarring so as to the Wire rings used.

dispense with hand labor Which'is ordinarily employed for this purpose and to greatly .expedite the making of such cores as well as getting a more uniform product.

The invention comprises the construction and arrangement of parts hereinafter described and claimed.

In the accompanying drawings Fi ure 1 is a vertical sectional view through t e apparatus showing a portion \of the jarring machine; Fig. 2 is a vertical section showing a portion of the molding parts; Fig. 3 is a plan view of the shell core plate; Fig. 4 is a ottom view of a portion thereof; Fig. 5 is a sectional view of one of the bushings em-- ployed; and Fig. 6 is a plan view of one of Any suitable jarring mechanism may be used in con unction with my improvedapparatus. In Fig. 1 a portion of a jarring machine is shown, this comprising theframe 1 on which the machine plate 2 is mounted for vertical movement. This plate may be actuated by any suitable mechanism, the drawings showing a power cylinder 3 for lifting the same and permitting it to drop upon an anvil 4.

In using my apparatus I place upon the machine plate a suitable mandrel plate 6 preferably provided with a central opening 7 for receiving a threaded stud 8 to be used in securing the central pattern or mandrel 9 to the plate, by inserting in the mandrel a threaded bushing 10 which may be secured to the mandrel by any suitable means, such as screws 11. This mandrel will, of course, be made'of a shape to conform to the inte rior of the ring or shell core. Also resting on the mold bottom plate 6 and fitting 1 around the lower portion of the mandrel 9 is a shell corering 12, or shell core late as it is called, upon which the core ox 13 is arranged to rest, the shell core plate being rovided with an annular shoulder 14 overw 'ch a downwardly projecting lip 15 on the core box projects in order to hold the core box centered. The core box is made of a form to suit the exterior of the ring or shell core, the latter being formed in the annular space between the mandrel and the core box.

The shell core plate 12 is provided with the holes 16 for receiving the lower ends of anchoring members 17 which are embedded in the core, and in order to adapt said core plate to the making of cores of various sizes it is 'a disk 18 to which is connected a U shaped spring 19 extending down into the hole and having its endsentering depressions or slots 20 out in the lower face of the plate so as to revent the disk from getting out of place, but leavin it easily movable.

"The anc oring members 17 are also preferably used as vents to permit theescape of gases, while casting and are therefore formed of tubes provided with perforations 21 and are adapted to have then upper ends closed by any suitable means, such as the disks 22. These anchors not only serve to center the core in the mold and to secure the core to the base plate of the flask when casting so as to prevent the core from rising due to the weight of the molten metal being poured in, but also serve as supports for the core and hold it in proper position in the mold cavity, as well as providing means for adjusting the position of the core vertically in the mold. The particular core shown is for use in cast ing cored out water cooled twyers, the anchors passing out at the points. where the holes are made through the wall of the larger end of the twyer.

The core remains on the core plate 12 until the core is baked and strong enough to be handled, and since the sand expands in the process of baking provision vmust be made to relieve that portion ofthe sand, shown at 23,

which extends down into the holes 16 in the core plate. This is done by providing bushings 24 which fit loosely in the holes in the o enings in the bushings 24 are flaring, as

I part of the mold.

I strengthening members so constructed as to adjust its diameter with the sand in des own, so as to form the part 23 of the core tapering, which provides for adjustment of the core vertically in the mold, said conical parts 23 ressing down into the sand of the drag. This also gives a tight joint at this In case an inwardly projecting flange is to be formed around a hole a removable collar '25 is placed on the core plate 12 and around the u perend of the bushing 24. The anchor embers 17 at their lower ends will be provided with suitable means for securing the same to the bottom plate of the flask, the drawings showing for this purpose inte riorly threaded sockets 26 secured to the threaded lower ends of the anchors and adapted to receive nipples orother securing means. The anchors 17 and sockets 26 do not, however, extend below the bottom face of the core plate 12, so .that the molded core can be carried by means of said ring and supported thereon in the oven while baking.

, To" assist in strengthening the shell like core and prevent the sand from breaking be-.

fore baking, I provide one or more horizontal scending over the conically arran ed anchoring members, and not spring ack when taken from..the mandrel. Ordinary rings have been used for this purpose but under the load of sand being packed down into the mold these rings were forced to slide down on the tapering anchors, thus partially straightening the portion of the rings be tween the anchors. The consequence is that the metal of the ring is put under tension and when the core is taken from the mandrel they tend to resume their normal v circular shape with the result of fracturing the sand. To avoid this I make the rings 30 expansible, such as over-lapping the ends of the rings for a considerable distance and providing the ends with eyes 31 surrounding the ring proper so that under pressure the rings can expand, the eyes merely sliding over the wire as will be readily understood. The consequence is that the rings merely expand when sliding down instead of being put under strain.

In conjunction with the apparatus I use an ordinary reservoir 33 and a center cone 34 laced on top of the 'corebox and man dre respectively. If desired, the mandrel mandre l plate plate 6 may be dispensed with and the machine late used for this purpose.

\ In the use of the apparatus the mandrel 9 is first secured to'the mandrel late 6'after which the core late 12 is placed around the mandrel and t e anchor members 17 with bushings 24 surrounding their lower ends inserted in four of the holes 16 of the core plate, the remaining holes being closed by the disks 18. The tops of the tubular anchors 17 are closed by the disks 22 and the core box is then set upon the core plate 12 after which the whole is brought underneath the reservoir and sand is fed down in the usual way. The machine is then put in operation, thus jarring the sand down into the space between the mandrel and core box and also down into the flaring upward ends of the bushings 24. When the jarring is completed the sand is out 0d at the top of the core box, the core box removed and the core raised by means of the core plate 12, thereby stri ping the core from the mandrel. The bushings 24 are then removed and the core baked.

Various changes can be made in the de-" vices described without departing from the s irit of my invention or the terms of the c aims herein made.

What I claim is:

1. Core molding apparatus comprising a mandrel plate provided with mandrel securing means, an annularshell core plate or ring seating on said mandrel late and surround-' ing the base of the man rel and a core box seating on said core plate.

2. Core molding apparatus comprising a rovided with a threaded boss for securing t e mandrel, an annular shell core plate or ring resting on the mandrel plate and surrounding the base of the mandreland rovided with anchor receiving open-' ings,'.and a core box seating on the core p ate.

3i'Core molding apparatus comprising a mandrel plate, a shell core plate resting on said mandrel plate and provided with a plurality of sets of anchor receiving openings,

each' -set being a diflerent distance from the center than the other, sets, closures for said openings, and a core box seating on said core plate.

4. Core molding apparatus comprising a mandrel plate, an annular she'll core plate resting on the mandrel plate and surrounding the base of the mandrel and provided with anchor receiving openings, and a core box seating on said core plate.

5. Core molding apparatus, comprising a core plate provided with a plurality of sets of anchor receiving openings, each set being a different distance from the center than the other sets, closures for said openings, and a core box seating on said core plate.

6. Core molding ap aratus comprising a core plate provided with a plurality of sets of anchor receiving openings, closure disks for said openings provided with springs projecting down into the openings and engaging the same frictionally, and a core box seating on said plate.

7. Core molding apparatus comprising a core plate provided with anchor receiving openings, removable bushings in said openings fitting the lower ends of the anchors, and a core box seated on said core plate.

8. Core molding apparatus comprising a core plate provided with openings, ushings in said openings for receiving the lower ends of anchoring members and flaring upwardly, and a core box seating on said core plate.

9. Core molding apparatus comprising a core plate provided with anchor receiving openings, removable bushings fitting in said openings and flaring upwardly, a removable collar or ring seated on the core lateand surrounding the upper end of a bus 'ng,'and a core box seating on said core plate.

10. Core molding apparatus comprising a core plate provided with anchor receiving openings, anchor members projecting into said 0 enin s but not extending below the lower ace 0 the plate and provided on their lower ends with threaded members, and a core box seating on said core plate.

11. Core molding apparatus comprising a core plate provided with anchor receiving openings, anchors projecting down into said openings, but not extending below the lower face of the late threaded sockets on the lower ends 0 said anchors, and a core box seating on said core plate.

' 12. Core molding apparatus comprising a core plate provided with anchor receivlng openings, perforated pipes projecting into said openings and provided with anc oring members at their lowerends, and closures for the tops of said pipes.

13. Core molding apparatus comprising a core plate provided with openings, perforated pipes provided with threaded sockets at then ends and. projecting into said openin s, an d closures for the upper ends of the pipes.

'14. Core molding apparatus comprising a core plate provided with anchor receiving openings, anchors projecting down into said openings, and expansible rings surrounding said anchors:

removable bushings in said opemngs,

15. Core molding apparatus comprising a 3 core plate provided with anchor receiving openings, anchors projecting down into said 0 enings, and rings surrounding said anciiors, said rings having overla ping ends and provided on their ends wit eyes surrounding the ring proper.

In testimony whereof, I the said WILLIAM D. BERRY have hereunto set my hand.

WILLIAM D. BERRY. Witnesses:

ROBERT C. TOTTEN, JOHN F. WILL.