US1154238A - Machine for stamping sand molds. - Google Patents

Description

A. T. DRYSDALE.

MACHINE FOR STAMPING SAND MOLDS.

APPLICATION FILED JUNE 5. |915.

1,154,238. Patentedept. 21, 1915.

2 SHEETS-SHEET I.

' 'JIL III I CoLUMBIA PLANOURAPM C0., WASHINGTON, D, c.

A. T. DRYSDALE.

MACHINE FOR STAMPING SAND MOLDS.

APPLICATION HLED JUNE 5, Isla.

1,154,288. Patentedsept. 21, 1915.

2 SHEETS-SHEET 2. M, a. vf/g ALEXANDER T. DRYSIDALE, OE BURLINGTON, JERSEY.

MACHINE FOR STAMPIN'G SAND MOLDS.

Application filed June 5, 1915.

T0 all whom t may concern:

Be it known that I, ALEXANDER T. DRYs- DALE, a citizen of the United States, residing at Burlington, in the county of Burlington and State of New Jersey, have invented a new and useful Machine for Stamping Sand Molds, of which the following is a specification.

In the manufacture of cast iron pipe, such as water or gas mains, it is desirable, and sometimes necessary, to have various lettering cast on the pipe in raised letters, such as the name of the manufacturer, the year in which the pipe is cast, the name of the customer, and the consecutive number of the pipe.

At present, this lettering is done by hand, the individual letters being mounted lon wooden blocks, and the letters being separately stamped into the mold by pressing these wooden blocks against the sand manually. This is not only troublesome, but does not produce good results, as by reason of the carelessness of the molders the lettering may be crooked,the depth of the letters may lack uniformity, and the whole legend may sometimes be entirely illegible. lSometimes this results in the rejection of thepipe by the inspector, and Vsuch rejections are sometimes so frequent as to cause serious trouble, delay, and loss.

It is the object of my present invention to provide a machine which will stamp all the letters at one time, and will insure their being perfectly alined and perfectly legible, and by which the letters may be made of any desired depth and all of uniform depth.

In carrying out my invention l provide a main body which is sufiiciently small so that it can be inserted in the mold and which carries any number of radially movable letter blocks, on which are mounted lthe desired letters. These letter blocks are springpressed inward, but may be moved outward by air pressure, which is supplied to the interior of the body to act against the inner surfaces of the letter blocks.Y Tn order to lessen the machine work, there is preferably provided an air bag of some iieXible material within the body, the air pressure being supplied to the interior of this .bag and the exterior thereof bearing against the letter blocks. The body is also made in a plurality of parts, which are acted against by the same air bag so that these parts are .spread to engage the mold walls before the letter Speeicaton of Letters Patent.

Patented. Sept. y21, 1915.

Serial No. 32,412.

blocks are moved radially to force the letters into the mold.

The accompanying drawings illustrate my invention.

Figure 1 is a vertical central section through a mold showing my improved mold stamping machine in place therein; Fig. 2 is a vertical section through the mold stamping machine, on a slightly larger scale than Fig. 1, being taken substantially on the line 2 2 of Fig. l and showing the letter blocks forced outward ;l Fig. 3 is a plan of the mold stamping machine shown in Fig. 2; Fig. l is a section on the line li-l of Fig. l2; Fig. 5 is a perspective view of one of the letter blocks; and Fig. 6 is a perspective view of one of the letter type which are removably mounted in the letter blocks.

The mold stamping machine has a hollow substantially cylindrical body which is made in a plurality of parts. As shown, there are two mating parts 10 and 11, which are substantially semi-cylindrical in shape, with inwardly projecting flanges 12 at their ends, to form the end closing plates of the hollow cylinder. The two parts 10 and 11 are connected. by alined hinges 13 at one side so that they can have a Yslight opening and .closing movement relative to each other. A

tension spring 14. tends to draw the two parts 10 and 11 together' about the hinges 13. The joint between the parts 10 and 11 opposite ythe hinges 13 is covered by a lap strip 23, to keep sand out of the inside of the body. The surfaces of the parts 10 and 11 are cut away from and within the true cylindrical form as they approach their meeting plane, to provide for clearance when inserting the machine into and removing it from the mold.

Eachof the parts 10 and 11 has one or more longitudinal openings 15 in its walls, which openings extend nearly to both ends, and in these openings are mcuted radially movable letter blocks 16. These letter blocks are of the form shown in Fig. 5, with a main portion slidably fitting in Vthe opening 15, a pair of lateral flanges 17 near their inner surface for limiting the outward movement of the letter blocks by engaging the walls of the members 10 or 11, and a dove-tailed slideway 18 in its exterior face. This dove-tailed slideway 18 is closed at the lower end, but is open and partly cut away at the upper end to allow the insertion and removal of the type blocks 19, which slidingly fit in such dove-tail slideway and have exterior faces which are curved to lit the mold wall and bear raised letters 20. Ordinarily, there is but one letter on each type block. By this construction the type in the different letter blocks may be changed without removingthe letter blocks from the body portion. The letter blocks have leaf springs 21 attached to them for bearing against the inside wall of the members 10 and 11 and tending to draw the letter blocks 16 inward so that the outer surfaces of the letters 20 will be inside of the cylindrical form of the outer walls of the parts 10 and 11, for purposes hereinafter apparent. rlhe inward movement of the letter blocks 16 is limited by the heads of guide screws 22.

lWithin the hollow body formed by the parts 10 and 11 is an air bag 25, of any suitable fleXible material, such as rubber. This bag rests against the inner surfaces of the c letter blocks 16, which are slightly concave to receive it, and also against intermediate lsupports 26 between adjacent letter blocks 16. The ends of the air bag 25 are provided by a plate 27, preferably of metal, at the bottom and a plate 28, also preferably of metal at the top. AThe plate 28 has a central boss which is threaded to receive the lower end of a pipe 29, which also extends through a central boss 30 on the end plate 12 of the member 10, the interfitting end plate 12 on the member 11 being hollowed out to fit around such boss 30.V [a lock nut 31 may be mounted onv the pipe 29 above the boss 30. The pipe 29 forms both the support for the machine and a supply pipe for the air. Itis provided at the desired distance above the machine with a pair of cross arms 32, for engaging the top of the mold and thus fixing the depth to which the stamping machine is lowered into the mold. At its upper end the pipe 29 leads into a three-way valve 83, which on one side is connected by a rubber hose 311 to any suitable source of air pressure and at the other is connected to an upwardly turned l.. 35 for discharging into the atmosphere.

ln operation, the sand mold 110 is formed in the flask 41 in any ordinary or convenient manner. Then the mold has been formed ready for lettering, my improved mold stamping machine is lowered into the mold, until the arms 32 strike the top of the mold, as shown in Fig. 1. 'While the mold stamping machine is thus being lowered, the interior of the air bag 25 is connected to the atmosphere so that the springs 21 hold the letter blocks 16 inward and the spring 14 holds` the two parts 10 and 11 drawn together. When the mold stamping machine has been loweredl into place, the desired lettering being of course arranged in the letter Ablock 16 before lowering it, Vthe valve 33 Vis turned to admit airV from the pipe 341 to the interiorrof the air bag 25. The springs 21 and 14 are of such relative strength that the air pressure thus admitted to the air bag 25 first moves the two parts 10 and 11 relatively to each other about the hinges 13 to cause the outer walls of the parts 10 and y11 to engage the walls of the mold firmly, and then the continued supply of air to the airbag 25 forces the letter blocks 16 outward simultaneously to cause the letters 20 on the type blocks 19 to embed themselves in the mold walls. The air pressure in the bag 25 is uniform throughout the bag, of course, so that the letter blocks 16 move radially, and so that the various letters are all embedded to substantially the same depth. When the letters 2O have been pressed into the mold walls, the valve 33 is turned to allow the air in the air bag 25 to escape to the atmosphere through the exhaust L 35, whereupon the springs-21 first force the letter blocks 16 radially inward and then the spring 14 pulls the two parts 10 and 11 together. Then the mold stamping machine may be withdrawn 'Y from the mold, and the pipe cast in the mold in the usual manner. Since the'letters 2O are within the cylindrical outline of the machine, the letters do not drag against the mold wall when the machineV is being inserted or withdrawn, and because of the relative strength of the springs 21 and 141 the movement of the letter blocks is always radial so as to produce perfectly legible lety terst lllhen the next pipe mold is ready, the lettering on the mold stamping machine may be changed as desired and the operation repeated with such mold.

I claim as my invention: Y

1. A mold stamping machine, comprising a hollow body portion composed of a plurality'of parts movable relatively to each other, a spring tending to draw said parts portion to slide kinward and outward, a spring tending to draw said letter block inward, said last-named spring being stronger than said first-named spring, and

together, a letterblock mounted in said body Y means for applying iiuid pressure within said body to move said body parts outward relatively to each other and to move said letter block outward relative to the body.

2. A mold stamping machine, comprising a hollow body portion, a letter block mount- .Y ed in said body portion to slide inward and outward, a spring tending to draw said letter block inward, and means for applying fluid pressure within said body to move said letter block outwardrelative to the body.

3. A mold stamping machine,`comprising a hollow'body portion composed of aplurality of parts movable relatively to each other, a letter block mounted in said body portion to slide inward and outward, a.

spring tending to draw` said letter block inward, and means for applying fluid pressure within said body to move said body parts outward relatively to each other and to move said letter block outward relative to the body.

il. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion to slide inward and outward, a spring tending to draw said letter block inward, and means for applying fluid pressure within said body to move said letter block outward relative to the body.

5. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion to slide inward and outward, and means for applying fluid pressure within said body to move said letter block outward relative to the body.

6. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion to slide inward and outward, means for applying uid pressure within said body to move said letter block outward relative to the body, and type letters removably mounted in said letter block.

7. A mold stamping machine, comprising a hollow body portion comprising a plurality of relatively movable parts, a spring tending to draw said parts together, a letter block mounted in said body portion and movable inward and outward relatively thereto, a spring tending to draw said letter block inward, said last-named spring being stronger than said first-named spring, an air bag of flexible material mounted within said hollow body and bearing against said block, and means for supplying fluid pressure to the interior of said air bag for spreading the parts of the body part and for forcing said letter block outward.

8. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion and movable inward and outward relatively thereto, a spring tending to draw said letter block inward, said last-named spring being stronger than said first-named spring, an air bag of flexible material mounted within said hollow body and bearing against said block, and means for supplying fluid pressure to the interior ofvsaid air bag for forcing said letter block outward.

9. A mold stamping machine, comprising a hollow body portion comprising a plurality of relatively movable parts, a letter block mountedin said body portion and movable inward and outward relativelythereto, a spring tending to draw said letter block inward, an air bag of flexible material mounted within said hollow body and bearing against said block, and means for supplying fluid pressure to the interior of said air bag for spreading the parts of the body part and for forcing said letter block outward.

l0. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion and movable inward and outward relatively thereto, a spring tending to draw said letter block inward, an air bag of flexible material mounted within said hollow body and bearing against said block, and means for supplying fluid pressure to the interior of said air bag for forcing said letter block outward.

l1. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion and movable inward and outward relatively thereto, an air bag of flexible material mounted within said hollow body and bearing against said block, and means for supplying fluid pressure to the interior of said air bag for forcing said letter block outward.

12. A mold stamping machine, comprising a hollow body portion comprising a plurality of relatively movable parts, a letter block mounted in said body portion and movable inward and outward relatively thereto, an air bag of flexible material mounted within said hollow body and bearing against said block, and mea-ns for supplying fluid pressure to the interior of said air bag for spreading the parts of the body part and for forcing said letter block outward.

13. A mold stamping machine, comprising a hollow body portion, a letter block mounted in said body portion and movable inward and outward relatively thereto, an air bag of flexible material mounted within said hollow body and bearing against said block, means for supplying fluid pressure to the interior of said air bag for forcing said letter block outward, and type letters removably mounted in said letter block.

In witness whereof, I have hereunto set my hand at Burlington, New Jersey, this thirty-first day of May, A. D. one thousand nine hundred and fifteen.

ALEXANDER T. DRYSDALE.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of* Patents, Washington, ID. C.

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