US3238576A

US3238576A - Pattern plate with resilient member in cavity

Info

Publication number: US3238576A
Application number: US242311A
Authority: US
Inventors: Russell W Taccone
Original assignee: TACCONE CORP
Current assignee: TACCONE CORP
Priority date: 1962-12-04
Filing date: 1962-12-04
Publication date: 1966-03-08
Anticipated expiration: 1983-03-08

Description

March 8, 1966 R. w. TACCONE 3,238,576

PATTERN PLATE WITH RESILIENT MEMBER IN CAVITY Filed Dec. 4, 1962 United States Patent 3,238,576 PATTERN PLATE WITH RESILIENT MEMBER IN CAVITY Russell W. Taccone, Erie, Pa., assignor to Taccone Corporation, Erie, Pa., a corporation of Pennsylvania Filed Dec. 4, 1962, Ser. No. 242,311 6 Claims. ((31. 2248) This invention relates to molding machines and, more particularly, to molding machines for making sand castings.

This invention is particularly concerned with molds from pattern plates having relatively deep pockets formed therein where sand is forced into these pockets by high pressure or high density molding machines.

As the sand is compressed against the resilient pad placed at the bottom of the pocket, it exerts an upward force which helps break loose the green sand pockets during stripping. Without the use of these compression pads, the green sand pocket will break off or adhere to the sides and result in a scrap mold.

A solid rubber pad can be used or spring loaded means can be substituted. Also, inflatable diaphragms can be utilized to help release these high density green sand pockets.

It is, accordingly, an object of the present invention to provide an improved pattern plate.

Another object of the invention is to provide a pattern plate in combination with a stripping means therefor.

A further object of the invention is to provide an improved molding machine in combination with a pattern plate.

Yet a further object of this invention is to provide a molding machine which is simple in construction, economical to manufacture, and simple and eflicient in operation.

With the above and other objects in view, the present invention consists of the combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawing and more particularly pointed out in the appended claims, it being understood that changes may be made in the form, size, proportions, and minor details of construction without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing:

FIG. 1 is a partial cross sectional view of a molding machine according to the invention;

FIG. 2 is a cross section of the machine shown in FIG. 1 with the flask and mold partly stripped from the pattern plate; and

FIG. 3 is a cross sectional enlarged view of another embodiment of the stripping means.

Now with more particular reference to the drawing, the molding machine shown is of the general type shown in Patent No. 2,698,976. It has a pattern plate with a flask -11 supported thereon. The flask 11 is supported below a head 12. The head 12 has a flexible resilient diaphragm 13 attached thereto by means of an open frame 30 which sandwiches the diaphragm 13 between the frame 30 and a flange 36. Bolts 24 hold the frame 30 and the flange 36 together.

The flasks are supported by means of a bottom flange 22 resting on the uppermost part of flanged wheels 15 which are carried on a conveyor 14. Means is provided for lifting the wheels of the conveyor 14 up with the flask supported thereon to lift the flask from the fixed pattern plate 10 and thereby strip the mold from the pattern plate and thereby strip the sand from the pockets.

Pocket bores 17 have countenbores 16. A rubber block 18 is supported in the pocket bores 17 by backing plates 20 which are bonded to the rubber blocks and are held in place by studs 19. The pocket bores 27 have resilient blocks 26 supported therein. Grooves 28 are shown by way of example to indicate how various contours of pockets can be made in the mold.

During molding, the flasks 11 are carried down the conveyor 14 on the wheels 15. When the flask 11 reaches a position over the pattern plate 10, the wheels 15 are lowered to drop the flask 11 onto the pattern plate with locating pins 21 extending through proper locating holes in the flask. Sand is then deposited in the flask 11. The head 12 with frame 30 is then lowered onto an upper flange 23 of the flask. The sand 25 is then compressed by means of the diaphragm 13 to force the sand into the

pocket bores

17 and 27. Pressure transmitted from the diaphragm 13 to the sand compresses the

rubber blocks

18 and 26.

Then when the conveyor wheels 15 are lifted to raise the flask 11 from the pattern plate and thereby strip the sand from the pattern, the

rubber blocks

18 and 26 expand to their original shape and, in so doing, they urge the sand out of the pocket bores. The force of the blocks literally lifts the sand from the pocket bores, thus preventing the sand projections from breaking off, which would destroy the mold.

In the embodiment of the invention shown in FIG. 3, a pattern plate is shown in partial cross section with a bore 127 therein and a pocket 116. Thus, when sand is compressed into the pocket 11 6, it will force plate 121 down flush with the bottom surface of the bore. Then when the sand mold is stripped, a resilient block 118 will be expanded, urging the sand out of the pocket 1-16. The surface of the sand will be held flat by the Plate 121.

The resilient block 118 is sandwiched between the plates 120 and 121 disposed in the bore 127. Studs 119 hold the resilient block 118 in place.

The foregoing specification sets forth in the invention in its preferred practical forms but the structure shown is capable of modification within a range of equivalents without departing from the invention which is to be understood is broadly novel as is commensurate with the appended claims.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A molding machine comprising a pattern plate having pockets therein, said pattern plate being adapted to support a flask to receive green sand under pressure, said pockets having a resilient member forming a part of the bottom thereof, said resilient member being adapted to be distorted when said sand is compressed in said flask and said pockets, said resilient member urging said sand from said pockets when said flask with said sand therein is removed.

2. A molding machine comprising a pattern plate having pockets therein, some of said pockets being in the form of counterbored bores in said pattern plate, said pattern plate being adapted to support a flask to receive green sand under pressure, said bores having a resilient member forming the bottom thereof, said resilient member being adapted to be distorted when said sand is compressed in said flask and said pockets, said resilient member urging said sand from said pockets when said flask with said sand therein is removed.

3. The machine recited in claim 2 wherein said resilient member is in the form of blocks of rubber.

4. The machine recited in claim 3 wherein said blocks of rubber are sandwiched between two rigid members.

5. A molding machine comprising a pattern plate, said pattern plate having a generally flat top surface for supporting a flask, a flask on said pattern plate, and an up- Wardly facing pocket in said pattern plate, said pocket having a block of resilient compressible material therein, said flask and said pattern plate being adapted to be supported under the head of said molding machine whereby sand is compressed in said pocket and in said flask by means to compress said sand on said machine.

6. The machine recited in claim 5 wherein a roller conveyor for said flask is provided, said conveyor having a row of rollers at each side of said flask supporting said flask, and means on some of said rollers to lower said rollers with said flask onto said pattern plate and to lift said flask from said pattern plate.

References Cited by the Examiner UNITED STATES PATENTS Bogenschutz 22157 Sudziarski 22157 LeBaron 22-157 :Ol'son, 221 3 Olson 2213 Snoeyenbos et a1. 22157 10 J. SPENCER OVERHOLSER, Primary Examiner.

MARCUS O. LYON'S, Examiner.

Claims

1. A MOLDING MACHINE COMPRISING A PATTERN PLATE HAVING POCKETS THEREIN, SAID PATTERN PLATE BEING ADAPTED TO SUPPORT A FLASH TO RECEIVE GREEN SAND UNDER PRESSURE, SAID POCKETS HAVING A RESILIENT MEMBER FORMING A PART OF THE BOTTOM THEREOF, SAID RESILIENT MEMBER BEING ADAPTED TO BE DISTORTED WHEN SAID SAID IS COMPRESSED IN SAID FLASK AND SAID POCKETS, SAID RESILIENT MEMBER URGING SAID SAND FROM SAID POCKETS WHEN SAID FLASK WITH SAID SAND THEREIN IS REMOVED.