US1245953A - Leveling drawing-table for combination jolt-ramming and rock-over machines. - Google Patents

Description

W. C.INORCR0SS. mmm DRAWING man PoR COMBINATION IOLLRAMMING AND Rock-OVER MACHINESi APPLICATION FILED OCT. 2|; 1916.

Patented Novu 6, 1917.

2 SHEETS-SHEET I I *lI W. C. NORCROSS.

LEJTVW YJEAWHQG ABL'E FOD SOMBNATION lOLT-RAMMING AND ROCK-OVVER'MACHINES.

APPLICATION min 0m21.191s.

Patented Nov. 6, 191?.

2 sums-SHEET 2.

55% l ik w i is a specification.,v

'Unia-n WILLIAM c. Nonciaoss, V0F 'rn'nnn HAUTE, INDIANA. y

'LnlvnIzI'NG niiawINs-TABLE ron COMBINATION Joi.Ti .AMMIi\iGV ANnRooK-ovni 'If To all whom t may concern.' y' j', y f Be it known that IJVILLIAMG NORCRoss, a citizen of theUnitedv States, residing at TerreV Haute, county of vigmand'state'of Indiana,`have invented'cert'ain new and useful Improvements" in Leveling Drawing- Tables for Combination Jolt-Ramming and Rock-Over Machines, of which the following Y This invention'relates to leveling drawing tables for' combination jolt-ramming and rock-over machines and is an improvement on the leveling 'drawing table set forth'lin iny Patents No. 1224407, dated May 1, 1917 and No. 1231187 dated J une 26, -`1917 Machines' of the general class towliich my invention belongs embody an automatic joltramming machine,` vand drawing cylinder having a table to support 7the mold as it is lowered away yfrom the pattern, 'rock-over means being used totilt the rammed'flask, mold, pattern, and attachments to a position where the mold may be lowered away from the pattern. 1 i l Y.

In this class of machines, itis important to provide asuitably level and firm bearing or support for the mold while it is being drawn from the flask'and pattern for, unless supported perfectly level, there `will be a tendencyto distort the moldas itwill not draw clear from the pattern withoutrelative lateral movement.l f i j j" In my patents-aforesaid I have'sliown and l described `and in the latter of said patents have claimed, a novel leveling table or attachment for the drawing cylinder which is adapted to automatically adjust "itselffon elevation ofthe piston of the'drawingcylinder, by its contact withfthe bottom board or the battens thereof, after, the rammed mold has beenrocked-over. That drawing table'has improved'means whereby it "may be securely fastened in its set or adjusted position, such fastening being necessary inasmuch as the table is pivotally or oscillatorily supported in the region of its central portion.

The object of the present invention is the provision of an improved leveling drawing table which upon adjusting itself to inequalities of the bottom board or the battens thereof, is held in that position by friction between itself and its supporting means caused by the weight of the mold resting s MACHINES.

. l `jspsciiicafion' f Letters raient.

upon saidftable, thus 4vobviatii'ig they y ratentednemc, i917; Appiieatiozifiieaoqtoberai,191e. seriaiiwiaamsn Y 1" of employing alocking `means f which re'- f quires attention-on the part of theoperator.

The cost of manufacture ,and the-timersi quired to draw a moldare both greatly lessened 'byl my improvements while, at the same time Ithere is no possibility of the moldfbeing distorted. f f f My invention contemplates the provision of a leveling drawing tablewhic'h is tiltably mounted so that it "will conform tothe bottom board or'the'v battensthereof and, when the Iii-old is. supported by the table, thezpr'essure or weight Vof the mold vwill cause the table to be frictionally'held'upon',its gup'pgrt without resort to Yany 'locking d'evice-` f The table 'has a plurality of :supporting or bearing Asurfaces or devicesV on which the mold rests. Modifications maybe resorted to in'fthe manner of supporting or mounting the table."l`heA invention may be otherwise changed. Consequently, I dofnot limit myself to the precise construction `hereinafter described and shownffin the accompanying' drawings assuch -construction is to be iconsidered as illustrative,- rathery thanjrestrictive, ofthe scope lofthe invention.

'Inthe accompanying drawings:I

1 Figure 1 isa Yside'elevation of the draivf ing table, certain parts being broken awayl;

Fig.v 2 a'plan view thereof; v Fig. 3 a side elevation,'partlyxfbroken away, of a modification, and" s f Fig. 4 a plan view'thereof."

Referring first ,toy Figs. 1 and. 2', 1 cylinder ofthe drawing tableand lQthe'piston working therein. Any suitable means may be provided for lifting the-piston as, for

is 'the instance, compressed air. The-'drawingtable may be elevated and depressed mechanically fand the'cylinder dispensed "with',k "iffpre- I-ferred, in which event the raising and lowering means would be applied to the support 2.

The upper end of the support 2 has a ball 3. The drawing table comprises aplurality of sections 4 which have a plurality of bearing or supporting parts 5. The

mold, not shown, is adapted to rest upon the bearing parte 5 when the support 2 is elevated to bring the table against -the bottom board or the battens thereof of the mold which has been rammed and rocked-over, 0r otherwise positioned for drawing. The inner ends. ofthe sections 4 have concavities 6 which embrace and bear upon the ball 3. 'Ihe upright flanges 7 on the sections 4 are connected, above the ball 3, by a bolt 8 whose heads or head and nut 9 and 10, bear upon the outer faces of said flanges and are preferably rounded or formed to fit in corresponding conc'avities in the flanges as shown at 11. 'Ihe space 12 which exists between the flanges 7 enables the sections 4 to relatively move and to have a gripping action on the ball 3 when pressure is applied to said sections by the supporting of the mold thereby. The employment of the ball and the concavities 6 enables the sections 4 to tilt and twist, in a universal 1nanner, so that when the support 2 is elevated and the bearing points or parts 5 engage the bottom board or battens on the mold, the table will automatically conform to the p0- sition of the mold. lllhen the support 2 is lowered, to draw the mold from the pattern, the weight of the mold acting on the parts 5 causes them to exert a leverage so that the faces of the concavities 6 bear firmly and frictionally upon the 'ball and the table is thus automatically held, by frictional engagement, to the support 2. No otherl locking means is employed to hold the table in its adjusted position.

Referring to Figs. 3, 4, instead ofthe table being formed in a plurality of sections, it is in a single integral or rigid piece 13 which has arcshaped flanges 14 of suitable length, say 90, more or less. i Carried by the piston 2 is a head 3 which is a truncated senii-sphere, or spherical section, of relatively large diameter, on which the concave surfaces or edges 14a of the flanges 14 frictionally bear. Being of relatively large diameter, the head 8a provides a sufiiciently large support and superficial area so that the weight of the mold supported on the table 13 causes such frictional Contact as will hold the table in the position it has assumed when it engages the mold. I'he one piece tableL 13 has three bearings orkmold supportingpoints or surfaces 5a.

I wish it understood, however, that I do not limit myself to the number of bearing points 5 or 5?, that is, the number of points adapted to engage the mold.

In both forms of the invention, the connection between thetable and its support, is of the nature of a ball and socket joint, constituting a friction lock which holds the table where set when the mold rests on the table, as the center of gravity is about central with the said ball and socket support.

-Iaving thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A self-locking leveling drawing table comprising a plurality of relatively movable connected mold-supporting sections,

and a supportcommon to said sections, with 1 which said sections collectively engage.

2. A selflocking leveling drawing table comprising a plurality of` relatively movable connected mold supporting sections collectively provided with a cavity, and a rounded support, commonto said sections, said support being received in said cavity and said sections frictionally engaging said sup- 3..A self-loclring leveling drawing table comprising a pair of table sections hinged together, and a support with which said sections collectively engage.

4. A self-locking leveling drawing table comprising mold-supporting sections, loosely articulated together, and a support, common to said sections, with which they collectively engage.

5. A self-locking leveling drawing table comprising relatively movable sections, a loose connection betweenvr the innerA end portions of the sections, and a frictional support, common to the innervend portions of said sections.

. 6. A self-locking leveling drawing ktable comprising relatively movablesections having` cavities in their inner end portions, a loose connection between theinner end portions of the sections, and a rounded support received in the cavities aforesaid, with which said sections frictionally engage.

Y In testimony-whereof, I hereunto afHX my signature.

WILLIAM C. NORCROSS. y

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

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