US1176386A - Roll ramming apparatus. - Google Patents

Description

H. P. MACDONALD & E. M. HUGGINS.

ROLL RAIVIMING APPARATUS.

APPLICATION FILED NOV. I9. I914.

1,176,386. I Patnted Mar; 21, 1916.

WITNESSES I ZZZ? I HE COLUMBIA Pumuumwn c0 WASHINGTON, D. c.

H. P. MACDONALD & E. M. HUGGINS.

ROLL RAMMING APPARATUS.

APPLICATION FILED NOV. 19, I914.

Patented Mar. 21, 1916.

3 SHEETS-SHEET 2.

INVENTORS WITNESSES I a z v d W.

WMQW I 5% ATTORNEYS I BIA PLA H 50., WASHINGTON, D.

H. P. MACDONALD & E. M. HUGGINS.

ROLL JRAMMING APPARATUS.

APPLICATION FILED NOV- 19. 1914.

Patented Mar. 21, 1916.

3 SHEETS-SHEET 3.

wman-rem? ATTORNEYS THE CQLUMBIA PLaNoGRAPu c0., WASHINGTON. D. C.

UNITED STATES PATENT @FFICE.

HARRYP. MACDONALD, MONTCLAIR, NEW JERSEY, AND EDWARD MELVILLE HUGGINS, OF NEW YORK, N. Y., ASSIGNORS TO THE SNEAD & CO. IRON WORKS, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ROLL RAMMING- APPARATUS.

Specification of Letters Patent.

Patented Mar. 21, 1916.

Application filed November 19, 1914. Serial No. 872,896.

To all whom it may concern:

Be it known that we, HARRY P. MACDON- ALD and EDWARD MELVILLE HUGGINS, both citizens. of the United States, residing in Montclair, county of Essex, and State of New Jersey, and New York city, county of New York, and State of New York, respectively, have invented certain new and useful Improvements in Roll Ramming Apparatus, of which the following is a specification.

This invention relates to roll ramming apparatus and it has for one of its primary objects the provision of a novel operating mechanism for actuating the roll, which is simple and efiective. ()ur invention also contemplates an improved means for supporting the operating mechanism with relation to the ramming roll, and also improved mechanism for effecting certain initial movements of the roll, as will further appear.

A further object of the invention has reference to the provision of a fluid-pressureactuated direct driving means for the ramming roll which is compact and requires a minimum of head room.

- The foregoing, together with such other objects as may hereinafter appear, or are incident to our invention, we obtain by means of a construction which we have illustrated in preferred form in the accompanying drawings, wherein:

Figure 1 is a perspective view of our improved apparatus ramminga mold; Fig. 2 is a similar view with the parts in inoperative position; Fig. 3 is a section through the fluid pressure operating means, drawn on an enlarged scale; Fig. 1 is an end view I of Fig. 3; and Figs. 5, 6 and 7 are enlarged views of details of our invention.

The general arrangement of the apparatus will first be described, attention being particularly directed to Figs. 1 and 2. The

main part of the machine comprises a base block 7, at the forward end of which is located a pair of supports or tracks 8 adapted to support the ramming roll 9, when the latter is in retracted or inoperative position. Adjacent to the rear end of the tracks 8 is a pair of curved brackets. 10 which are bolted to the base bloc-k and have their up per ends extended forwardly to a point substantially above the forward end of the tracks 8.

Located in front of the base block 7 is a second base 11, the upper face of which is plane to support a pattern plate 12. A flask 13 is carried on the pattern plate in the usual manner. Pivoted to the forward end of the stationary tracks, as at 14:, is a tilting roll supporting member comprising the tracks 15 which in operative position extend horizontally over and rest upon the top edges of the flask in alinement with the stationary tracks, whereby the roll may be advanced to ram the mold. In inoperative position, the tracks are swung to a nearly vertical position and are locked to the bracket 10 by means of the spring-held latches 16 which engage the notches 17 out into the vertical legs of the tracks (see Fig. 7). In this position, the tracks lie clear of the flask which can then be removed and another one substituted. The latches are released by means of the handle 18. In order to facilitate the manipulation of the tracks 15, We provide counterbalance springs 19 which arefastened at one end to the ends of the tracks and at the other to the base block 7. a

The ramming roll 9 has a forked yoke 20 to which is pivoted a strike-oif member 21 having wheels 22 riding upon the tracks.

The strike-off may be of any preferred construction.

Attention is now directed to the mechanism for imparting a reciprocatory movement to the ramming roll. Secured to the yoke 20 is a direct driving operating rod 23 extending rearwardly of the roll. Heretofore it has been customary to provide this rod with a rack portion on its lower face adapted to be engaged by a gear wheel operated from a motor through the medium of interposed gear reduction means. \Ve propose, however, to operate this rod directly by fluid pressure means, obviating the use of a motor and the intermediate gearing. In the preferred embodiment of our invention we accomplish this by providing the rod 23 with a piston 21-, which works in a cylinder 25. Thisconstruction is shown in Fig. 3, from inspection of which it will be noted that the cylinder, 25 is a shell, the ends of which are closed by cylinder heads 26 and 27, respectively at the front and rear. secured to the cylinder preferably intermediate the ends thereof, is a two-part collar 28 clamped about the cylinder by means of the bolts 29. The'cylinder heads are held in place by two sets of rods 30, each set extending from a cylinder head to the collar 28 This construction is simple and the" parts can be readily assembled about the rod 23 and its piston 24. The head 26 is pro-- vided with a stufling box and a gland 31 and within the cylinder is a pair of springs 32, one adjacent to each head. The rod 23 is advanced by admitting fluid pressure to the cylinder on opposite sides of the piston 24, as will further appear.

In practice, it is customary to advance the roll from its stationary support across the flask and then back to initial position. It will be obvious that the roll will be shifted vertically as it rides onto and from off the sand and the rod 23 will also, be moved. Provision for this movement of the rod must therefore be made in the means for operating the rod, and with this in view, we have mounted the cylinder 25 for radial movement. The preferred means for accomplishing this is the provision of trunnions 33 on the collar 28 which are mounted in the brackets 34 fastened to the base block 7 The cylinder is thus free to rock as the vertical position of the roll and the rod 23 varies, and thereby eliminates binding.

Referring now to the means for supplying and controlling the fluid pressure for operating the piston 24, a pipe 35 leads from a suitable source of supply to the valve casing 36, and from this casing a pipe 37 leads to the front end of the cylinder and a pipe 38 to the rear end thereof. The casing is also provided with an exhaust port 39 in communication with an exhaust pipe 40. The valve may be of any desired type, but We prefer a rotary valve 41 having two ports 42 and 43. In one position of the valve,- the port 4t2 establishes communication between the pipe 35 and 37, thereby supplying pressure to the cylinder in front of the piston, causing it to move to the rear and the port 43 establishes communication between the pipe 38 and the exhaust port, whereby pressure is exhausted from the cylinder behind the piston. In the other position of the valve, pressure is admitted through the pipe 38 and exhausted through the pipe 37. The rotary valve is operated by a lever 44, carried on the spindle of the valve. (See Fig. 1).

The springs 32 cushion the piston at extremes of movement, but we also provide an air cushion in addition, together with means for causing the initial movements of the piston and roll to be more rapid. :We

secure the foregoing by providing the pipe 40 with an exhaust T 45 having arestricted exhaust passage 46 and with a puppet valve 47 opening under high pressures, permitting a rapid exhaust and closing after reduction of pressure, whereupon exhaust takes place slowly through the port l6. In operation, pressure is admitted to the cylinder behind the piston, driving the latter together with the rod 23, and roll 9, to extreme forward position, whereupon the valve is reversed and pressure is admitted in front of the piston, the pressure behind the piston exhausting through pipe 40. The puppet valve is subjected to the exhaust pressure and immediately' opens, causing a .rapid exhaust which of course permitsthe live pressure in front of the piston to force the latter. back rapidly. When the pressure is reduced by the exhaust, the puppet valve closes and during the remainder of the rearwardstroke of the piston, exhaust takes place slowly through the restricted port 46, thereby cushioning the piston at the extreme of its rearward movement. The operation is the same in the reverse direction. The initial movement of the ramming roll, both to the front normally held in position by a spring 48. p

Extending longitudinally of the cylinder. 25 and secured in position by brackets 49 is a tube 50 having a slot 51 in the'bottom. The

yoke 20 of the roll is provided with a bracket 52 which is adapted to support a rod 53 which extends to the rear where it is supported by a second bracket 54 having a bulb-shaped end slidingly fitting into the tube 50. Two stops 55 and 56 having rollers 57 are mounted on the rod 53.

The operation is as follows: To start the roll, the lever 44 is pushed forward to admit pressure behind the piston, and the parts are advanced. As the roll, together with the rod 53, approach the extreme of forward movement, the stop 56 engages the lever 44: and pushes it past center whereupon the spring 48 throws it to reverse position, causing the roll to be retracted. When the'parts approach extreme rear position, the stop In order to prevent displacement of the pattern plate 12 and flask 13 by the end thrust of the roll as the latter is reciprocated, we provide the base 11 with lugs 58, and the pattern plate and flask with ears 59 and 60 arranged to engage the end faces of the lugs 58. The rod 53 is yieldingly held in the bracket 52by the springs 61.

One of the'chief advantages incident to our improved mechanism for operating the controlling valve is that all binding and sticking of the parts is prevented. This will be clear from the fact that the operating rod 53 is carried in the tube 50 which because it is supported from the cylinder 25rocks with the cylinder when the latter moves to compensate for the variations in elevation of the ramming roll. The forward end of the rod 53 is supported from the yoke of the ramming roll and therefore the rod 53 moves in unison with the other parts as they shift under operative conditions. A further advantage incident to the telescoping engagement of the bracket 54 (which carries the rod 53 with the tubular member 50) is that the over-all length of the rod 53 is materially reduced and the parts are arranged in compact form.

We claim 1. A roll ramming apparatus comprising in combination a reciprocating roll, an operating member therefor, fluid pressure actuating means for said member, and a mounting for said means compensating for variation in the elevation of the roll while the latter is being operated, said mounting being relatively fixed.

2. A roll ramming apparatus comprising in combination a reciprocating roll having an operating member secured thereto, a cylinder member for actuating said operating member, and means for introducing fluid pressure into said cylinder member, one of said members being movably mounted to compensate for any variation in the elevation of the roll as the latter is being operated.

3. A roll ramming apparatus comprising in combination a base, a reciprocating roll adapted to be advanced for ramming a flask, an operating member for the roll, and a fluid pressure means for actuating said member having a cylinder mounted on said base for movement compensating for the variation in elevation of the roll as the latter rams the sand.

4. A roll ramming apparatus comprising in combination a base, a reciprocating roll adapted to be advanced for ramming 1 a flask, a bar secured to the roll, a cylinder in which the bar works pivotally mounted on said base, and means for admitting fluid pressure to the cylinder.

5. A roll ramming apparatus comprising in combination a base, a reciprocating roll adapted to be advanced for ramming a flask, a bar secured to the roll, a cylinder in which the bar works trunnioned on the base, and means for admitting fluid pressure to the cylinder.

'6. A roll ramming apparatus comprising in combination a base, a reciprocatng roll adapted to be advanced for ramming a flask, a bar secured to the roll, a piston on said bar, a cylinder in which the piston reciprocates trunnioned on the base, and means for admitting fluid pressure to the cylinder.

7. A roll ramming apparatus comprising in combination a reciprocating roll, an operating member therefor, fluid pressure means for actuating said member, and means for automatically controlling the fluid pressure whereby the roll rapidly gains momentum and then travels more slowly.

8. A roll ramming apparatus comprising in combination a reciprocating roll, an operating member therefor, fluid pressure means for actuating said member comprising a cylinder, means for supplying pressure thereto, and means automatically reducing exhaust pressure rapidly to a predetermined point and then causing a slow reduction of said pressure.

9. A roll ramming apparatus comprising in combination a reciprocating roll, an operating member therefor, fluid pressure means for actuating said member comprising a cylinder, means for supplying pressure thereto, and exhaust means having valve means to cause a rapid reduction of exhaust pressure and a restricted outlet to cause a slow exhaust after the pressure has been reduced to a predetermined point.

10. A roll ramming apparatus comprising in combination a reciprocatory ramming roll, an operating rod secured thereto, a cylinder in which said rod works, a valve for controlling the supply of fluid pressure to said cylinder, and means for automatically shifting said valve at extremes of travel supported from the cylinder and roll to compensate for the variation in elevation of the roll as the latter is operated.

11. A roll ramming apparatus comprising in combination a reciprocatory ramming roll, an operating member therefor, a cylinder in which said member works mounted for movement compensating for variation in elevation of the roll as the latter is actuated, a valve on said cylinder for controlling fluid pressure supply thereto, a lever for operating .said valve, a longitudinal supporting member carried by said cylinder, a rod sup ported at one end from the roll and having a sliding engagement at the other end with said supporting member, and stops on said rod adapted to engage said lever on extremes of travel of the roll.

12. A roll ramming apparatus cpmprising signed our names in the presenee of the two in combination a ramming roll, a drlve rod subscribed wltnesses.

secured thereto, a cylinder in which the rod HARRY P. MACDONALD. 1

works, yielding means in the cylinder for EDWARD MELYILLE HUGGINS 5 cushioning the drive rod, and means for sup- Witnesses:

plying pressure to said cylinder. IRA S. SNEAD,

' In testimony whereof We have hereunto A. QGREE LEEJ Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0.

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