US1264427A - Combination jolt-ramming and rock-over machine. - Google Patents

Description

W. C. NORCROSS.

COMBINATION JOLT RAIMMING AND ROCK OVER MACHINE. APPLICATION FILED AUG. 10. 1917.

Patented Apr. 30, 1918.

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W. C. NORCROSS. COMBINATION J'OLT RAMMING AND ROCK ove n MACHINE.

APPLICATION FILED AUG-10.19M-

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W. C. NORCROSS.

COMBINATION JOLT RAMMING AND ROCK OVER MACHINE.

. APPLICATION FILED Aue.| 0. 1912.

Patented. Apr. 30, 1918.

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fioarllz'r ze WILLIAM C, NQRCLROSS, 01? TERREI'IAUTE, INDIANA.

COMBINATION JOLT-RAMMING AND ROCK-OVER MACHINE.

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Specification of Letters Patent.

Patented Apr. 30, 191%.

Applicationfiled,August 1Q, 1917. Serial No. 185,471.

To all whom it may concern:

Be it known that 1, WILLIAM C. Noaonoss,

a citizen ofthe United States, residing at Terre Haute, county of Vigo, and. State of Indiana, have invented certain new and useful Improvements in Combination Jolt- Raimning and Roclr- Over Machines, of whichthe following is aspecification.

This invention relates to combination joltramming and rock-over machines of the class set forth, for instance, in my Patent No. 1,224,407, May 1, 1917, and application Serial No. 138,204 filed December 21, 1916.

Among the principal mechanical. problems in machines of this class are to devise rockover or lever mechanisms which will minimize Shocker jar when the table rocks past the vertical position either when swinging thev mold over to position it for drawing,

or, on return of the rock-over table after the mold has been drawn. The weight carried by the roclcovor table is frequently considerable and, with increase in weight, the tendency toward shock or ar increases.

Another ditliculty encountered is the tendency to cramp the piston which supports the mold table during the rock-over operation, due to the difliculty in devising a mechanical movement wherein the pivots of the swinging parts will be so related as to prevent side thrust.

The present invention, which embodies improvements on the machines of my aforesaid application and patent, has for its object the provision of rock-over means of improved construction, relationship of parts and novelty of operation, whereby the foregoing difficulties are very largely, it not entirely, overcome. The rock-over mechanisn is so constructed and arranged that during one part of the rock-over movement of the table, the swing is sustained a given pivotal point but is subsequently transferred to another pivotal. point and, combined therewith, is a rockable mounting for the aforesaid pivotal points, the object being to have thesustaining pivotal points and the pivotal point where the lever is connected to the .rock-over table, as nearly as possible in a verticalline duringthe different positions of the parts when the table is rocking over to drawing or return position, and to gradually take up the shock or thrust on the pivotal points, ,particularlywhen the point of rocking is transferred,automatically. as it were, from one pivotal point to another, at thetime when the tableis nearly vertical.

.My improvements.minimize cramping of the piston and aitorda more or. less shocklcss action when thetablc passes the vertical position, in rocking over,

I combine with the jolting table or. piston head of the jolt-rannning machine,abalancing cylinder whose .pistonhas a vertical motion which prevents sudden movement oi thejolting table and the rock-overtable due to careless operation.

There is also provided a safetycushion stop which is adapted to prevent shock at the end of the piston travel. and to assist in; starting the load over when the air pressure is released. Guiding means, in the form of apin carried by the piston and operating in a guide on the cylinder, may be used.

Asa part of the rock-over mechanism, there is provided a settable, or adjustable, abutment whose arrangement can be varied to permit early or later transference of the pivotal point sustaining the rock-over ac tion, according to the load which is being carried by the rock-over table. With alight load, the time of transference from one pivotal point to the other occurs when the rockover table is almost at right anglesto the jolt-table or piston head, whereas with a heavy load, this transference should. occur before the rock-over table assumes substantially vertical position.

In the present application there is shown and describedan improved operating system for a drawing table which is adapted for use in connection with the present invention but as that system and drawing table are just as well adapted for use with other jolt-ramming and rock-over. machines as the present one, the improved operating system for the drawing table forms the subject matter for an. application executed of even date herewith.

An automatic valve, not shown, is pro vided for, causing the. piston. to jolt the mold. Avalve such as shown in my Patent No. 1,224, iO7, or, application Serial No. 138,204, or, application Serial. No. 126,846 filed October 21, .1916, may be used.

The embodiment of the invention which is ples thereof and is tobeconsiderecLthere ted lines showing the piston elevated beyond normal limit and the bell-crank lever being locked by the dog;

Fig. 2, is a similar view, full lines showing the piston again lowered, the rock-over table and mold approaching vertical position, and the parts positioned just before the rock-over action is transferred from one pivot to another; dotted lines representing the rock-over table and mold completely rocked over, the rocker shifted, and the drawing table elevated to drawing position;

Fig. 3, a front elevation;

' Fig. i, detail of the rock-over dog;

7 Fig. 5, a detail plan view of the link; Fig. 6, a longitudinal section thereof; Fig. 7, a longitudinal section of the rocker or shock absorber, and

Fig. 8, a plan view thereof.

The machine has a base 1 which supports cylinder 2 having a valve controlled inlet pipe 3 and a valve controlled exhaust pipe 4:. Operating in the cylinder is a piston 5 which carries the main table 6 and the supplemental or rock-over table 7, which is hinged thereto at 8. To admit the fluid pressure to the bottom of the cylinder 2 beneath the lower end of the piston 5, there is provided a pipe 9, having a three-way valve 10. The valve 10 remains closed during the normal reciprocation of the piston 5 when the mold is being jolted, the valves of the pipes 3 and t then being open. When the mold has been jolted or rammed, the valves in the pipes 3 and t are closed, so that the piston is then subject to pressure entering through the pipe 9 or exhausting through said pipe, according to manipulation of the valve 10. By manipulating the valve 10 the operator can elevate the piston 5 or lower it as desired, to thereby bring about the different positions of the lever mechanism, to cause rocking over of the table 7 and its return.

The piston and main table, or head 6, may be guided or prevented from turning by a pin 11 carried by the table and operating in a guide 12.

The automatic valve which controls the reciprocations of the piston 5 is not shown but it may be like the valve of my aforesaid application and patents.

To cushion the piston at the end of its travel and also to assist in starting the -load over when the air pressure is released from the cylinder 2, I provide a safety bolt 13 which is carried by the table 6 and slides through an opening in the flange or head 14c of the cylinder. 011

this rod is a sleeve or cup 15 which rests on a washer and nut 16 and contains a coil spring 17 whose upper end projects beyond the cup. The spring 17 engages the collar or head it and cushions the movement of the piston at the end of its travel, until the end of the sleeve or cup 15 engages the head ll as shown by dotted lines. The device then serves as a stop, the table 7 being rocked over and arrested in that position, ready for the mold to be drawn, as shown by dotted lines in Fig. 2.

To prevent sudden movement of the piston due to careless operation, there is provided a balancing cylinder 18 whose piston 19 has a slot and bolt connection 20 with the table 6. The slot is long enough to permit the normal play of the piston 5 when ramming the mold but when the rock-over operation begins, sudden movements of the piston 5 are prevented. The cylinder 18 contains a piston connected to rod 19 and operating in oil,

One or two of the rock-over mechanisms now to be described may be employed, but only one need be used. A rocker 21, having an are shaped lower face, rests on the bed and is provided with a tapered opening 22 through which passes a bolt 23 which holds it to the bed or base and yet permits it to rock. The rocker has a stop 24: and ears A link, Figs. 5, 6, which is shown at 26, is pivoted to the ears on a bolt or pin 27 and is adapted to rest on the stop or lug Carried by the link 26 is a stop 28 which is in the form of a rectangular nut secured by a bolt, pin or other fastening 29 which passes eccentrically through it, as shown in Fig. 6. The face 30 of the stop is the effective abutting face as will presently appear. The different faces 31, 32, 33 are at different distances from the pin 2%). According to which of the faces 80, 31, 32, 33, is in the position occupied by the face 80, Fig. 6, there will be determined the point or time in the elevation of the rock-over table when the pivot 27 will constitute the pivotal point of the rock-over movement. If the load is light, the surface 30 will be used as the abutting surface, to enable the rock-over table 7 to assume a nearly vertical position before the pivot 27 becomes the rock-over center. If the load be heavy, one or the other of the surfaces 31, 3a, 33 will be used, the stop 28 being turned, or set, for that purpose.

The rock-over lever 31- is pivoted to the link 26 at 35. During the first part of the rock-over movement and the last part of the return movement of the table 7, the pivot 35 is the rock-over center. Fivoted at 36 to the lever 3-l is a bell-crank lever 37 which is pivoted at 38 to the rock-over table 7. The free end of the bell-crank lever 37 has a claw or catch 39.

During normal jolting of the tables 6 and 7 to ram the mold there is no rocking of the lever 37.. The lever 34 t'hen swings on the pivot 35 and lever 37 on the pivots 36, 38. The link 26 is then resting on the stop 24. I Pivoted to the lever is a weighted dog or catch 40 which has a shoulder 41 adapted to lock'with the catch 39. of the lever: 37

. when the piston has been elevated far enough, as shown by dotted line position in Fig. 1 Pivoted-to the lever 34 is 'a dog 42, Fig. 4, which has a catch' or shoulder, preferably claw, 43.. .The upper branch of the claw 43 rests upon the upper face of the stop 28, thereby preventing the dog 42 from falling, The eifective locking shoulder of the dog is the part 43 which is normally separated by a suitable space from the step .28, the face for instance, so thatthere will be no engageinent during jolting the mold nor until the piston has been run up to causetheparts to assume the full line position of-Fig. 2. Consequently, thepiston "may be elevated to cause the lever 37 tolock with the dog 40 without any engagement of the shoulder 43 and stop 28 as shown by dotted lines Fig. 1. The air may then be released. from the cylinder 2, whereupon the piston 5 will descend and the lever 34 will rock on pivot to bring the rock-over table 7 to the full'line position, Fig. 2; before the shoulder 43 will engage the stop 28. Air being again admitted to the cylinder 2, the piston will rise but now the lever 34 is rigid with the link 26 and consequently the center of rocking is transferred to the pivot 27. Thetable7 and mold finally assume the inverted position shown bydotted lines Fig. 2.

For the purpose of releasing thedog from the lever 37 there is provided a wire or cable 44 connected to the dog and running around a pulley 45 on the dog 42, thence to an operating handle 46, Fig. If two rock-over mechanisms are used, the other dog 40 will be connected to the handle 46 by awire or cable 44 running around a and air, though shown herein, is set forth and claimed 'in another application Serial No. 185,472 executed of even date herewith. The drawing table 46 is supported andoperatedby a piston 47 which operates in a cylinder 48.'l. The piston is elevated, or allowed to descend by the actionfofoil contained in a reservoir 49, pipe 50 and cylinder 48 Air pressure is admitted to the reservoir 49 through apipe 51 under the control of a three-way valve 52. A stop cock 53 is provided in the pipe 50. Air being admitted to the reservoir 49 by turning three-way valve 52, the oil is forced through the pipe 50 and elevates the piston 47, thereby running the drawing table 46 up to the mold 54. vWhen the leveling drawing table 46 takes a hearing against the follow board of the mold 544, the stop cock 53 is closed by the operator. The air is then released by turning the threeway valve 52 When the clamps are re moved from the mold 54, the operator opens the cook 53 and the oil in the. cylinder 48 sure, the oil but for the presence of valve 53 would he forced back into the reservoir 49 before the operator wasready to draw the mold.

tionally shown in Figs. 1 and 2. Inpractice Y these valves, the. valves 52, 53, and the handle 46 will be grouped for convenience of operation.

, Operation: The valves controlling pipes 3 and 4 are first opened, the valve 10 being closed The piston 5 will then automatically rise and fall to ram or. jolt the. mold 54. hen the mold has been suitably olted, the

valves for pipes 3, 4, are closed andthe rockover of the mold is effected by manipulating the three-way valve 10. Referringto Fig. 1, pressure is admitted beneath piston 5 to raise it until the dog 40 latches with the bellcrank lever 37 as shown in dotted lines. The valve 10 then. turned to release the air. The piston, tables, andmold, are then sup ported by the pivot 35, the link 26 resting upon lug 24 and the rocker 21 being in the position shown bylful'l lines, Fig. 1. It will be observed. that, the pivot 35 is but a short distance offset from a vertical line running through the pivot 38 so that a nearly direct lift is obtained and the usual tendency to cramp the piston 5 is minimized, On the release of. the air, the piston descends to the full line )osition in Fig. 2. The lever 37 being locked to. the lever 34, the table 7 and the mold 54 are rocked, on pivots 35 and 8,

to the full line position, 2., ,The pivots 38 and 35am now in substantially the same vertical line, just prior tothe table 7 assuming vertical position. The travel of the the link 26, consequentlyythe center o fl-the lever 34 has now brought the dog 42 tothe rocking action is transferred from the pivot 35 to the pivot 27. Air being now admitted under piston 5, the latter rises and the table 7 is swung toward a vertical position. This is the point where shocks and jars are the greatest just as the table 7 rocks past the vertical position. The transfer of the point of swinging from 35 to 27 is accompanied by a rocking movement of the rocker 21 from the full line position to the dotted line position, Fig. 2, the link 26 lifting from the lug 24:. The shock of the rock-over is thus minimized. The piston having lifted to extreme extent, the cushion spring 17 engages the head 14:, cushioning the descent, in inverted position, of the table 7 and mold 5 1 to the dotted line position Fig. 2 until, finally, the sleeve 15 abuts the flange or head 1 1 and arrests the parts. The drawing table is then run up, dotted line position, Fig. 2, and the mold drawn as before described. 7

The mold having been drawn, the pressure is released through the valve 10 and the piston 5 lowers whereupon a reversal of the foregoing operations is carried out. In returning the table 7 back to the full line position of Fig. 2, the link 26 rests on the lug 24B and the shock of the return of the table 7 past vertical position is absorbed by the rocking of the rocker 21 back to the full line position, Fig. 2. Pressure is now admitted and the piston 5 raised. The dog 12 becomes freed from the stop 28 and the parts finally assume the dotted line position, Fig. 1. The handle 46 is now operated to re- 7 lease the dogs 4L0 l0 from the levers 87.

Pressure is again released through valve 10 and the parts then assume the full line position Fig. 1.

7 When valves in the pipe 3, 4, are opened,

the piston 5 will reciprocate for j olting another mold.

a rock-over table carried thereby, and rockover means for said table having a fulcrum adapted to automatically shift in a general transverse direction relative to the jolting carrier, during the rocking over of said table said fulcrum being located separate from said carrier and table.

3. A combination jolt-ramming and rockover machine comprising a jolt rock-over table, an articulated lever having a pivotal Valve 10 is then closed.

connection with said table, means for releasably locking the parts of the lever together, and a shiftable supporting fulcrum for said lever.

4. A combination jolt-ramming and rockover machine comprising a jolt rock-over table, an articulated lever having a pivotal connection wi h said table, means for releasably locking the parts of the lever together,

.and a supporting fulcrum for said lever which is arranged to automatically shift during the rocking over of said table.

5. A combination jolt-ramming and rockover machine comprising a jolt rock-over table, an articulated lever having a pivotal connection with said table, means for releasably locking the parts of the lever together, a link pivoted to said lever and itself having a supporting fulcrum, said lever being adapted to swing on its pivotal connection with the link during a portion of the rocking over of the table, and means for coupling the lever and link together during another portion of the rocking over movement to transfer the pivotal point of the lever to the fulcrum of the link.

6. A combination jolt-ramming and rockover machine comprising a jolt rock-over table, an articulated lever having a pivotal connection with said table, means for releasably locking the parts of the lever together, a link pivoted to said lever and itself having a supporting fulcrum, said lever being adapted to swing on its pivotal connection with the link during a portion of the rocking over of the table, and a dog carried by the lever which is normally free from the link, said dog being adapted to couple the lever to the link during another portion of the rocking over movement to transfer the pivotal point of the lever to the fulcrum of the link.

7. A combination jolt-ramming and rockover machine, comprising a jolt rock-over table, a rocker, and an operative connection between the rock-over table and said rocker.

8. A combination jolt-ramming and rockover machine comprising a jolt rock-over table, a rocker, and a lever pivoted to the table and to the rocker.

9. A combination j olt-ramming and rockover machine comprising a jolt rock-over table, a rocker, and an articulated lever having means for releasably locking its parts together, said lever being pivoted to the rock-over table and to the rocker.

10. A combination jolt-ramming and rock-over machine comprising a jolt rockover table, a rocker, and a lever pivoted to the rock-over table and having a shiftable fulcrum on the rocker.

11. A combination jolt-ramming and rock-over machine comprising a jolt rockover table, a rocker, a link pivoted to the rocker, and adapted to engage therewith,

insane? and a lever pivoted to the rock-over table and to the link;

12. A combination joltramming and rock-over machine comprising a jolt rockover table, a rocker, a link pivoted to the rocker and adapted to engage therewith, a lever pivoted to the rock-over table and to the link, and a dog adapted to couple the lever to thelink after the table has swung a part of its rock-over movement to thereby transfer the support of the lever from its pivotal connection with the link to the fulcrum of said link.

13. A combination jolt-ramming and rock-over machine, comprising a jolt rockover table, a rocker, a link pivoted to the rocker and adapted to engage therewith when in one position, a lever pivoted to the rock-over table and to the link, a dog carried by the lever, and an adjustable abutment carried by the link with which the dog is adapted to engage when the link is in another position.

14. In a combination jolt-ramming and rock-over machine, the combination with a reciprocating jolting carrier, and a rockover table carried thereby, of means for rocking over said table, and a balancing piston and cylinder having a direct positive connection with the jolting carrier which permits normal play of the carrier during ramming of the mold, said piston and cylinder serving as a cushion for up and down movements of the carrier during rock-over operations.

15. In a combination jolt-ramming and rock-over machine, the combination with a reciprocating jolting carrier, and a rockover table carried thereby, of a safety cushion stop cooperating with the carrier to arrest it and the rock-over table when the latter has been rocked over.

16. In a combination jolt-ramming and rock-over machine, the combination with a reciprocating jolting carrier, and a rockover table carried thereby, of a safety cushion stop comprising an abutment and a spring which normally extends beyond the abutment, said spring and abutment cooperating with the carrier to arrest it and the rock-over table, with a cushioning action, when the table has been rocked over.

In testimony whereof, I hereunto affix my signature.

WILLIAM (J. NonoRoss.

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

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