US1178341A - Jolt ramming-machine for ramming the sand in sand molds. - Google Patents

Description

C. OETLING.

,IOLT RAMMING MACHINE FOR RAIVIMING THE SAND IN SAND MOLDS.

Patented Apr. 4, 1916.

J 3 SHEETS-SHEET l.

APPLICATION FILED DEC. I6, 1913. 1 'l 8 341,

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C. OETLING..

1011 RANMlNG MACHINE FOR RANINING THE SAND |N SAND MOLDS.

APPLICATION FILED DEC. I5, 1913.

Patented Apr. 4, 1916.

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FIGB- THE coLU/nm PLANOGRAPH C04. WASHINGTON, n. c.

Patented Apr. 4

APPLICATION FILED DEC. I6 1913.

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FIG7

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miran sraans Partnr ermee.

CARL OETLING, OF BERLIN, GERMANY.

J' OLT RAMMING-MACI-IINE FOR RAMMING- THE `SAND IN SAND MOLDS.

Specification of Letters Patent.

Patented Apr. 4, 1916.

Application filed December 16, 1913. Serial No. 807,106.

To all whom 15 may concer-n.'

Be it known that I, CARL OETLING, a citizen of the Empire of Germany, residing at Kochstrasse/T, Berlin, Germany, have invented certain new and useful Improvements in Jolt Ramming-Machines for Ramming the Sand in Sand Molds, of which the following is a specification.

My invention relates to jolt-ramming machines sand in sand molds.`

The object of the improvements is to provide a machine of this class, in which the impact or jolt is produced by connecting the driving mechanism to the platform supporting the mold and causingthe same to throw the platform downward and on a shock receiving member, the platform and the mold supported thereon being returned into elevated position by power storing members such as springs, counter weights, or compressed air, which are thrown into action when the support strikes on4 the shock receiving member, or by mechanical means. As compared to machines such as are now in use and in which the platform is lifted by mechanical means and thereupon a1- lowed to drop by gravity my improved machine is preferable in this respect, that driving means of different kind can be used which are not suitable in the old machines, and the moving masses can be balanced by suitable means such as swingingmasses connected with the platform, which massescan be made to act on the platform by theirinertia after the shock and thereby to impart to the blow the character of a lasting blow. These constructions are Amore fully explained in the detailed description of the various embodiments of the invention; Where an expansible fluid is used asa driving medium, the said fluid can be made to act by expansion so that the area of the piston can be reduced.

A further object ofthe invention is to provide a machine in which in combination with the jolt ramming, mechanical means for compressing the sand are provided by reciprocating the mold toward and away from a pressing head or plate. Such pressing may be performed while pulling the platform downward by causing the pressing plate or head' to descend at a comparatively greater velocity, or at the end hof the upward stroke of the platform` by forcing the improvements in for rammlngV the same against a pressing plate whichiseit'her` stationary or head.

i For the purpose of explaining the invention several examples embodying the same have been shown in the accompanying drawings, in which the same letters of reference have been used in all the views to indicate corresponding parts.

In said drawings-Figure l, is a vertical section of a machine in which no balancing weights and pressing head are provided. Fig. 2, is a partial horizontal section taken on the line 2-2 of Fig. l. Fig. 3, is a longitudinal section of a machine provided with power storing masses and pressing' head, Fig. 4, is a side view partly in section showing a machine provided with revolving power storing masses, Fig. 5, is a section taken on the line 5-5 of Fig. 4, Fig. 6, is a side view partly in section showing a machine provided with double springs, Fig. 7, is a side View partly in section showing a machine driven by an electromotor, and Fig. 8, is a partial longitudinal section taken on the line 8-8 of Fig. 7.

Referring to the example illustrated in Figs. l and` 2, a platform or table l which is adapted to support a mold is provided at its bottom face with cushioning members 2 made for example of wood, and it has a plunger 3 secured thereto which is adapted to reciprocate within a cylinder 4. Thecylinder is secured to an impact receiving plate 5 which is supported on springs 6 disposed within hollow pillars 7 rising from a base plate 8. The plate 5 is guided on the said pillars by means of guide members 9 and bars l0, and the platform l is guided in sleeves ll provided in the impact receiving plate 5. As shown four guide bars l0 and four spring cushions 6 are provided in my improved machine, but I wish it to be understood, that my invention is not limited to the construction shown in the drawings. The plunger 3 is forced downward within the cylinder 4 by meansof a suitable driving medium such as steam or compressed air, until the members 2 strike on the plate 5, the impact being taken up by the springs 6. After reversing the admission of the working fluid in any known or preferred way, the platform is aga-in lifted into its elevated position, and forced downward.

The example shown in Fig. 3 is similar to that shown in Figs. l and 2, and for conmoves toward the pressing venience in understanding the construction I.

have applied similar letters of reference to the corresponding parts. As shown the platform 1 is not provided with special guiding means connected with the impact receiving plate .5. On standards 12 rocking levers 13 are mounted which at their rear ends carry weights 14 and with their front ends engage above lugs 15 secured tothe platform l. TWhen forcing the platform 1 downward, the weights 14 are thrown Aupward so as to press the platform on the impact receiving plate 5 after the effect of the plunger 3 moving downward has come to an end. After having acted on the platform by their inertia, the weights 14 drop downward and raise the platform 1 with the mold placed thereon. By providing weights 14 of sufficient size, a single acting cylinder 4 may be provided, in which case also the piston 3 is returned by the weights at the end of its working stroke into elevated position. -In addition to the jolt ramming means a pressing plate 16 is provided which is supported on rods 17 and is equipped with a pressing head 18 adapted to enter into the mold rising into elevated position. The rods 17 are provided with springs 47 which are adapted to cushion the blow of the mold striking against the head 13. If desired means may be provided for gradually7 shortening the active length of the rods 17 during the operation of the machine, so that in the course of the ramming operation the head 18 enters into the mold to a greater depth.

1n the example shown in Figs. 4 and 5 in lieu of the impact receiving plate four separate spring actuated impact receiving blocks 19 are provided. The cylinder 20 is open at its bottom end and it is secured to fixed pillars 21. To the platform 12 a pistonrod 22 is secured which has an extension 23 at the opposite side of the piston 30, and the connecting rod 31 is connected to a crank pin 23 which is common to two fly wheels 24. The shafts 25 of the fiy wheels 24 are mounted on the bottom parts 26 of the impact receiving blocks 19 and they carry at their outer ends flyv wheels 27. The pressing plate 162 which at its bottom face is provided with a head l182 is connected by means of connecting rods 28 with crank pins 29 secured to the fly wheels 27. The crank arm of the pin 23 is shorter than that of the crank pin 29. When the piston 30 is moving downward within the cylinder 20, the shafts 25 are turned at an angle which corresponds to the stroke of the piston. The crank pins 29 are rotated at the same angle, but the downward stroke of the pressing head 162, 182 connected with the pins 29 is greater than that of the platform 12, because the crank arm of the pin 29 is greater, than that of the pin 23. Therefore when the platform 12 is moving downward the pressing head 182 enters into the mold so as to compressuthe-sand. The iiy wheels 24 and 27 are provided with additional eccentric masses'32 which are so disposed relatively to the crank pins that they move upward when the piston is movingido'wnward and are in the elevated position at the end of the downward stroke of the piston, so that they are still active a certain distance after the piston has completed its stroke and thereafter move downwardandturn the shafts 25 back so as to lift the platform 12 and the pressing plate 162. v

Vhile in the examples so far described a part of the weight of the masses moving downward is balanced by the power storing masses and the rotating weights respectively, Fig. 6 shows an example in which a part of the power is stored in springs. As shown the impact receiving plate 53 is supported between upper and lower springs 33,

and 34. The platform '1 is supported on the springs 33, so vthatit is partly balanced.

In the example shown in Fig. 7 the driving power is supplied by an electromotor 35 which is connected to a shaft 37 by means of a clutch 36..- Fly wheels 38 are provided for transmitting driving power to the platform 13 through ythe intermediary of a connecting rod 39. Also in this case additional masses 40 are eccentrically mounted on the fly wheels 3S. However, as the driving power is supplied by an electromotor, the fly wheels have not an oscillating movement, but continuous rotary movements. In order that the platform be heavily pulled downward and in contact with the impact receiving members 193, the rod 39 comprises an elastic member such as a spring 42, by means of which it is extended a certain amount while the crank passes through the dead center. The tension of the rod is such, that during the downward stroke ofthe platform 13 the rod 39 is not extended, but only while the crank passes through the dead center.

As appears from Fig. 8, the connecting rod consists of two sections 39 and 41. The section 41 receives in its lower hollow part the reduced upper end 46 of the section 39, the parts being secured to each other by a transverse bolt 45 passingthroughlongitudinal slots 45 made in the wall of the section 41. Around the section 41 the spring 42 is coiled which bears on a collar 43 of the section 41 and is engaged. at its upper end by a loose disk 44.` The bolt 45 engages with its ends the upper face of the disk 44, and exerts pressure on the said disk when the connecting rod 39, 41 is being pulled downward, so that the said spring is compressed after the necessary tension is attained, whereby the connecting rod is temporarily extended. As shown a pressing head 163, 183 is provided the construction of which corresponds to that of the example shown in Fig. 3. ,y

I claim:

l. In a jolt ramming machine, the combination with a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, and Ibneans to return the mold supporting mem- 2. In a jolt ramming machine, the combination with a mold supporting member, and impact receiving means located below the same, of power operated means provided below the supporting member and adapted to pull the supporting member toward the impact receiving means, and means to return the mold supporting member.

3. In a jolt ramming machine, the combination with a mold, a mold supporting member, and impact receiving means, of power operated means to throw the support'- ing member toward the impact receiving means, means to return the mold supporting member, and a pressing member adapted to enter said mold, said mold and pressing member being movable relatively7 to each other.

4. In a jolt ramming machine, the combination with a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, and automatic means to return the mold supporting member.

5. In a jolt ramming machine, the combination with a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, and weights tending to move the supporting member away from the impact receiving means.

6. In a jolt ramming machine, the combination with a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, and swinging weights tending to move the supporting member away from the impact receiving means.

7. In a jolt ramming machine, the combination with a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, at least one revolving weight adapted to return the mold supporting member, and a connecting rod connecting said weight and mold supporting member, said weight being so connected with the mold support as to be in elevated position when the support is in contact with the impact receiving means.

8. In a jolt ramming machine, the combination with a mold, a mold supporting member, and impact receiving means, of power -operated means to throw the supporting member toward the impact receiving means, means to return the mold supporting member, a pressing member adapted to enter said mold, and operating means for the pressing member.

9. In a jolt ramming machine, the combination with a mold, a mold supporting member, and impact receiving means, of

power operated means to throw the supporting member toward the impact receiving means, means to return the mold supporting member, a pressing member adapted to enter said mold, and means to move the pressing member in the same direction as the supporting member and at a greater velocity.

10. In a jolt ramming machine, the combination with a mold, a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, means to return the mold supporting member, a pressing member adapted to enter said mold, and a crank mechanism connected with the mold supporting member and the pressing member, the crank arm coperating with the pressing member being greater than that coperating with the mold supporting member.

l1. In a jolt ramming machine, the combination with a mold, a mold supporting member, and impact receiving means, of power operated means to throw the supporting member toward the impact receiving means, means to return the mold supporting member, a pressing member adapted to enter said mold, and a crank mechanism and at least one fly wheel connected with the mold supporting member and the pressing member, the crank arm coperating with the pressing member being greater than that coperating with the mold supporting member.

In testimony whereof I aiiix my signature in presence of two witnesses.

CARL OETLING.

Witnesses IVOLDEMAR HAUrT, HENRY HASPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatenta, Washington, D. C.

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