US3575232A

US3575232A - Foundry mold-making apparatus

Info

Publication number: US3575232A
Application number: US820239A
Authority: US
Inventors: Lester C Young
Original assignee: Spo Inc
Current assignee: Spo Inc
Priority date: 1969-04-29
Filing date: 1969-04-29
Publication date: 1971-04-20
Anticipated expiration: 1988-04-20
Also published as: FR2040374B1; AU1437270A; FR2040374A1; DE7015923U; GB1254253A; ES379111A1

Abstract

Jolting apparatus for compacting sand in a foundry mold, wherein a fluid motor is utilized to rapidly reciprocate a rapper member to impart impact blows to a table supporting the mold pattern.

Description

United States "Patent [56] References Cited UNITED STATES PATENTS [72] lnventor LesterC. Young Cleveland, Ohio 1 64/409X 164/ l 95X 1 64/ 207x LL m 0 m ru "n" e m m mm "r. U u e m n "B .6 m.m m HB mm H ".fl W0 Tm. M am m zm m c w .mC u m am O h WHW, YM h y C SOBe 319 1 m 566 THC 999 flmm Ill 1 ww m m 1 m h m mm m 1 omwm 238 e 597 5 y mfl 223 P MA mo 91mm 67 0 99m. 0m 9 BZNMm n off-l e PPWI SAASC 0 e N we d D- eil phmx AFPA 11]] 253 2247 [.|:l[

[54] FOUNDRY MOLD-MAKING APPARATUS Kochey, Jr. and Lawrence P. Kessler 8 Claims, 3 Drawing Figs.

164/207 B22c 15/02 ABSTRACT: Jolting apparatus for compacting sand in a l64/37,40, foundry mold, wherein a fluid motor is utilized to rapidly reciprocate a rapper member to impart impact blows to a table supporting the mold pattern.

[51] Int. [50] Field of 172, 173, 177, 181, 182, 183, 185, 193, 194, 195, 207, 209, 212, 284, 385, 409; 164/206 SHEET 1 BF 2 ATTORNEY PATENTED m m f \KMW k: \l R I EL W/l vN FIG-5 INVENTOE LESTER c. YOUNG ATTOENEY FIG-Z BACKGROUND OF THE INVENTION .lolting apparatus for compacting sand or similar material in a molding flask has been previously used, including the use of a fluid motor for rapidly reciprocating the joltin'g or rapping member. Reference 'may be had to my U.S. Pat. No. 3,270,375, .lolting Mechanism for Foundry Apparatus, issued Sept. 6, 1966, for a disclosure of a molding apparatus of this general type. The present invention involves certain modifications and improvements thereon. Molds presently are increasing in size and weight and it is necessary to utilize massive rapper members to aid in compacting the sand against the face of the pattern.

This presents design, manufacturing, and maintenance problems with respect to the jolting apparatus.

SUMMARY OF THE INVENTION The jolting apparatus of my invention makes possible the use of a large .rapper member and is constructed so as to minimize maintenance and to simplify design.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevational view partially in section of a foundryapparatus constructed inaccordance with my invention;

DESCRIPTION OF THE PREFERRED EMBODIMENTS Looking now to FIG. I of the drawings, depicts foundry apparatus including a table member 12 having a horizontal rectangular portion 14, with a vertical stem 16 secured to the center thereof. Stern 16 is threaded at its upper. end, and is secured to the tabletop by nut 17. A base support 18 is provided for supporting the deadweight mass of the table and whatever load might be carried on the surface thereof. The table is resiliently supported by the base 18 through the medium of springs 20 to enable the table and load to react more effectively from the series of rapper impact blows which are transmitted to the table by a fluid motor which will be described in more detail hereinafter.

The stem 16 has an outer surface 22 which coacts with a mass or rapper member 24 which is slideably mounted thereon. Secured to the lower end of stem 16 by means of bolts 25 is a piston 26. Surrounding piston 26 and slideably coacting therewith is cup-shaped member 28. Member 28 is bolted to rapper member 24. The piston 26 and cup-shaped member 28 form first and

second chambers

30 and 32 located above and below the piston, respectively.

A pressure source 34 supplies air under pressure to chamber 32 by way of

passages

36, 38,

ports

40, 42, and 44, and passageway 46. The pressure source 34 includes a valve 48 and a throttle valve 50. The introduction of pressurized air into chamber 32 causes the cup-shaped member 28 along with rapper member 24 to move downwardly from a first position shown in FIG. 1 to a second position shown in FIG. 2. Ports 52 located in the sidewall of cupshaped member 28 are provided for exhausting fluid from chamber 32 when member 28 is in its second or lower position. Chamber 32 is simultaneously cut off from pressure source 34 as ports and 42 move out of alignment with each other. Another passageway consisting of

passages

54, 56, and 58 introduces air into upper chamber 30 from a pressure source 60, which includes a valve 62, an adjustable pressure reducer valve 64, and an adjustable speed control valve 66.

It can be seen that as the cup-shaped member 28 and attached rapper member 24 move from the position shown in FIG. l to the position shown in FIG. 2, the volume of upper chamber 30 is greatly reduced, resulting in compression of the 7 air in this chamber. With simultaneous pressure exhaustion from chamber 32, the downward movement is stopped and reversed by the force exerted in chamber 30, resulting in an upward movement of the cup-shaped member 28 and attached rapper member 24 back toward the position of FIG. 1. The rapper member 24 thus imparts a sharp impact blow to the lower surface of the table 12. As soon as the impact has been imparted to the table, the cycle is rapidly repeated, at a rate in the range of 600 to 720 impacts perminute. To stop the oscillation of the rapper member 24, valve 48 is closed, which cuts off the air supply to chamber 32.

Guide pins 68 carried by the table 12 cooperate with openings 70 in the base support 18 to maintain proper alignment between these two members. Likewise, guide pins 72 carried by the table 12 cooperate with openings 74 in the rapper member 24 to maintain proper alignment between these members.

FIG. -3 illustrates an alternative embodiment of the invention which utilizes two

stem members

80 and 82 attached to the tabletop. The threaded upper ends of the stems are secured to the tabletop by means of nuts, and the lower ends are secured to a piston in the same manneras illustrated in FIG. 1. In other respects, the rapper assembly is essentially the same as that shown in FIG. 1; This dual stern arrangement gives added guiding support for the rapper member. It also gives added strength to the piston secured to the bottom thereof.

From the above, it can be seen that the jolting apparatus of both of the embodiments can make use of heavy, large-sized rapper members. Because of the fact that the cup-shaped member 28 and the piston 26 are bolted to the rapper member 24 and the stem 16,'respectively, any size rapper member, piston, and cylinder can be easily installed when the machine is initially built. This is of particular advantage due to the interrelationship of the rapper weight, rapper size, and the piston size needed for a specified jolting action on a table of a given size and loaded weight. Furthermore, if a jolting apparatus is to be used with a number of different table loads, the cup-shaped member, piston, and rapper members can be quickly and easily replaced by other sized members.

Another advantage of the present jolting apparatus is the ease with which it can be disassembled for repair or maintenance purposes. By loosening nut 17, the tabletop can be removed, allowing ready access and removal of the rest of the apparatus contained within the supporting base.

While it will be apparent that the embodiments of the invention herein disclosed is well calculated to fulfill the objects of the invention, it will be appreciated that the invention is susceptible to modifications, variations, and changes without departing from the proper scope or fair meaning of the subjoined claims.

Iclaim:

1. Apparatus for imparting a series of rapid blows to a table member comprising in combination a horizontal table member, vertical stern means secured to and extending downwardly beneath the table member, a rapper member surrounding the stem means and engageable with said table member, said rapper member being movable between first and second positions, piston means secured to the bottom end of the stern means, cylinder means connected to the rapper member adapted to coact with the piston means, first passage means for introducing fluid under pressure into a first chamber beneath the piston means in a first position of said rapper member thereby causing said rapper member to move away from said table member to a second position, second passage means for exhausting fluid under pressure in said first chamber in a second position of said rapper member, means in a second chamber above the piston means for exerting a force on said rapper member to urge the rapper member from its second position back toward said table member, movement of said rapper member from said first to said second positionv causing compression of said means in said second chamber with exhausting of fluid under pressure in said first chamber through said second passage means whereby said rapper member is rapidly moved back toward its first position and imparts a blow to said table member.

2. The apparatus set forth in claim 1, wherein the stem means is removably secured to the table member by means accessible from the top of the table.

3. The apparatus set forth in claim 1, wherein the piston means is removably secured to the stern means, and the cylinder means is removably secured to the rapper member.

4. The apparatus set forth in claim 1, wherein the stem means includes a plurality of vertical stems secured to the table member.

5. Apparatus for imparting a series of rapid blows to a table member comprising in combination a horizontal table member, vertical stem means secured to and extending downwardly beneath the table member, a rapper member surrounding the stem means and engageable with said table member, said rapper member being movable between first and second positions, piston means secured to the bottom end of the stem means, cylinder means connected to the rapper member adapted to coact with the piston means, first passage means for introducing fluid under pressure into a first chamber beneath the piston means in a first position of said rapper member thereby causing said rapper member to move away from said table member to a second position, second passage means for exhausting fluid in said first chamber in a second position of said rapper member, third passage means for introducing fluid under pressure into a second chamber above the piston means for exerting a force on said rapper member to urge the rapper member from its second position back toward said table member, movement of said rapper member from said first to said second position causing compression of the fluid in the second chamber with exhausting of fluid from said first chamber through said second passage means whereby said rapper member is rapidly moved back toward its first position and imparts a blow to said table member.

6. The apparatus set forth in claim 5, wherein the stem means is removably secured to the table member by means accessible from the top of the table.

7. The apparatus set forth in claim 6, wherein the piston means is removably secured to the stem means, and the cylinder means is removably secured to the rapper member.

8. The apparatus set forth in claim 7, wherein the stem means includes a plurality of vertical stems secured to the table member.

Claims

1. Apparatus for imparting a series of rapid blows to a table member comprising in combination a horizontal table member, vertical stem means secured to and extending downwardly beneath the table member, a rapper member surrounding the stem means and engageable with said table member, said rapper member being movable between first and second positions, piston means secured to the bottom end of the stem means, cylinder means connected to the rapper member adapted to coact with the piston means, first passage mEans for introducing fluid under pressure into a first chamber beneath the piston means in a first position of said rapper member thereby causing said rapper member to move away from said table member to a second position, second passage means for exhausting fluid under pressure in said first chamber in a second position of said rapper member, means in a second chamber above the piston means for exerting a force on said rapper member to urge the rapper member from its second position back toward said table member, movement of said rapper member from said first to said second position causing compression of said means in said second chamber with exhausting of fluid under pressure in said first chamber through said second passage means whereby said rapper member is rapidly moved back toward its first position and imparts a blow to said table member.

3. The apparatus set forth in claim 1, wherein the piston means is removably secured to the stem means, and the cylinder means is removably secured to the rapper member.