US2174999A - Flask hold-down mechanism for jolt tables - Google Patents

Description

Oct. 3, 1939. I RUSSELL 2,174,999

FLASK HOLD-DOWN MECHANISM FOR JOLT TABLES Filed Nov. 24, 1937 l} 27 l8 E /2 7 NI IIIIIIWS 2/ /X A v j :31:- I q /0 Snventor A 55: xx f 2.6 /4 zozwfl/msezz.

/ y %A% attorneys Patented Oct. 3, 1939 UNITED STATES PATENT OFFICE FLASK HOLD-DOWN MECHANISM FOR J 0LT TABLES Alabama Application November 24, 1937, Serial No. 176,379

3 Claims.

My invention relates to a hold-down appliance adapted for the attachment of a pair of sand lined flasks or like elements to a jolt table for the purpose of being rammed.

More particularly, my invention is concerned with a hold-down mechanism adapted for the ready attachment and detachment of a pair of centrifugal pipe molding flasks to a jolt table, by means of which a sand lining is rammed in In the production of centrifugal sand cast pipe it is the sand ramming step in the process which controls the speed of production of the finished pipe, and since the flasks are rammed on end the ordinary jolt table will accommodate a number of flasks so that multiple ramming can be accomplished and in this way the sand ramming step can be speeded up so that the rammed flasks can be produced without material increase in labor or plant cost at a rate equal to, or in excess of, that at which the flasks can be faced, poured and shaken out preliminary to their return as empty flasks to the jolt ramming table.

In the embodiment of my invention, it is proposed to ram two flasks together and to this end I mount them and their respective patterns on the jolt ramming table by means of suitable stationary guides associated with a common holddown or clamp means adapted to engage both flasks and hold them, correctly centered with respect to their patterns, securely on the table during the jolt ramming process.

My invention further contemplates providing the flask hub patterns with flanges adapted to engage under hold-down shoulders on their respective rigid flask guides, the others preferably being so shaped that the flask ends will interfit between them and center the flask on its pattern between its respective stationary guides.

My invention further contemplates associating with the guides for both flasks a common clamp means adapted to be readily adjusted to engage or release the flasks and while engaging them to hold them fast in position on the jolt table on diametrically opposite sides of both flasks.

My invention further contemplates utilizing reversely disposed T-shaped clamp elements, the bodies of which are slidably adjustable through a common guide and have a common screw to both hold them to their Work and in relative adjustment.

My invention further contemplates the utilization of guides for the flask which are vertically elongated so as to confine the flask to rectilinear movement until the hub print in the sand mold has cleared the hub pattern sufliciently to be uninjured by minor lateral displacements of the flask. This feature is of particular importance where a plurality of flasks are rammed together and are lifted and stripped from their respective 6 patterns at the same time by a multiple tackle, such as is described in my companion application Serial No. 176,378 for Multiple bail hoist tackle. for pipe flasks executed concurrently herewith.

My invention further comprises the novel details of construction and arrangement of parts which, in their preferred embodiment only are hereinafter described, reference being had to the accompanying drawing, in which:

Fig. 1 is a plan view showing the hold-down and clamp means disassociated from the jolt table but associated with two pipe flasks and their hub patterns, the flasks being shown in horizontal intermediate cross section.

Fig. 2 is a side elevation of the elements shown in Fig. 1 associated with a conventionel illustration of a jolt ramming table.

Figs. 3 and 4 are cross-sectional views taken respectively on the lines I1IIII and IV-IV of Fig. 1.

Similar reference numerals refer to similar parts throughout the drawing.

In the embodiment of my invention illustrated, I show conventionally a jolt table 5 made fast to a bumper element such as 5 associated with any suitable cylinder, not shown, for imparting vertical vibratory jolting motion to the table. I mount upon the table 5, near its corners, four angled flask guides each comprising a transversely arcuate upright guide leg I, terminating at its base in an arcuate undercut 8, and a horizontal leg 9 which is made fast by cap screws H) or the like to the jolt table 5. The legs I and $2 of each guide are preferably made up as an integral casting and have a center bracing back Web II.

The vertical inwardly directed arcuate faces of the legs 7 and of the undercuts 8 for each flask are concentric, the leg faces conforming to the curvature of the bottom flange 52 on their respective flask i3, and the arcuateface of the. undercuts 8 conforming to the curvature of the outer edge of the base flange it of their respective hub pattern plate l5, which plates are held fixedly in place on the jolt table by the studs 25. The body pattern it is centered at its lower end in the flask by a taper fit into pattern IS.

The two hold-down guides for each flask, which have been above described, are spaced about apart and they are equidistant from a third guide and hold-down member mounted near the center of the jolt table 5 and comprising a base ll suitably anchored, as by bolts, to the jolt table 5 and carrying crosswise above its center a transverse double guide element It, the end faces id of which are shaped to form arcuate guide faces similar to those on the guides I. The opposite edges of the base I? are reversely curved and are shaped to conform to and snugly fit against the marginal edges of the base flanges is of the patterns, and it will be noted that the cross member l8 overhangs the center of the faces I! and provides an undercut to receive and overhang the pattern flange 52. Thus each flask has three guides I, la which overhang its respective hub pattern and confine the flask to a rectilinear motion in being stripped from its pattern.

The cross guide member l8 has a. center slot l9 therethrough midway between two flasks when mounted on the jolt table and adapted to receive the clamp bars 2! which overlap and carry the hold-down cross arms.

Referring to Fig. 4, it will be seen that the cross arm 29 is made fast to, or formed integral with, the lower clamp bar 29 and stands with its underface flush with the underface of said bar, whereas the cross arm 22, which is similarly secured to or formed integral with the upper bar 29, is attached in underhung relationship therewith and has an underface lying in the same horizontal plane with the cross arm 2!. Thus while the bottom edges of these cross arms 2'! and 22 lie in the same plane their clamp bars 2D are superimposed. and are freely slidable lengthwise on each other through the slot IS in the center guide I8, whereby these cross arms can be brought together to overhang the flask flanges l2, as shown in Figs. 1 and 2, or shifted apart to clear said flask flanges. A set screw 23, controlled by a wing nut 25, is screwed through the top center of the elernent I8 into engagement with the upper clamp bar 20, as shown more clearly in Figs. 3 and 4. By running down screw 23, I clamp both bars 2!} in their adjusted relation and at the same time I force their cross arms 2| and 2?. downwardly against the flask flanges so as to hold the flasks firmly against any vertical vibratory play relative to the hold-downs I and la while the jolt table is in operation. The upper ends of the guides i, 1a are outwardly bevelled at 21.

In operation, assuming the screw 23 run up and the cross arms 2! and Z2 spread apart to their dotted position, Fig. l, and the hub pattern plates l5 securely attached by means of the studs 25 to the jolt table. I am ready to mount the flasks in position for the ramming operation. The flasks, with their base. flanges l2 slightly cocked, are eased downwardly, together or singly, into position between their respective guides ll, la and when rocked to vertical position they will abut their guides and fit snugly over the shoulder 2% on their respective pattern plate H5. The flasks are thus held snugly in centered relation with their hub pattern ready to be engaged by the hold-down means. The cross arms 2! and 22 of the hold-down means are then drawn together, their overlapped bars 2% sliding freely through the guide member !8 until the cross arms assume full line position in Fig. l, whereupon the clamp screw 23 is run down, firmly clamping the bars 2%? together and forcing the cross arms 2| and 22 downwardly against the exposed flask flanges l2 so as to hold the flasks firmly in centered position on their hub patterns with the flask flanges l2 engaged between the shoulders 25 of the latter and the guides l and 1a. Thus, the common hold-down clamp means provides a secure and firm attachment between the flasks and the jolt tablethat holds the flasks rigid with the latter during the jolt ramming operation. When the flasks have been completely rammed and are ready to be stripped from the hub patterns Hi, the set screw 23 is released, the cross arms 2| and 22 are shifted outwardly to dotted position, clearing the base flanges l2 of the rammed flasks, and suitable multiple hoist tackle. is applied, such as described in my said companion application and operated to strip flasks with a true vertical movement from their respective patterns, the base flange I2 of the flasks being guided during this vertical stripping movement by the elongated guides 1 and la so as to hold the flasks against any lateral displacement that might mar the hub sand prints until the latter has cleared the patterns 55, whereupon the bevelled faces 2'! at the top of the guides l and 1a permit the flasks to ride easily outward from the guides.

The common control for the application of the several clamp means, whether applied to a single flask or a pair of flasks, is an important feature of my invention.

My apparatus not only securely holds the flasks in position during the jolt ramming, but it prevents the marring of the hub sand print during the operation of stripping the sand moles in the flask from the hub patterns.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but it is susceptible of various changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim as new and desire to secure by Letters Patent, is:

1. In combination, a jolt table, a plurality of hub patterns and associated flask guides rigidly mounted on said tab-1e, separate flasks adapted to be directed by said guides into centered relationship with their respective patterns, and a commonly controlled clamp means simultaneously applicable to hold the flasks against vertical displacement with relation to their respective patterns during the ramming operation and comprising reversely slidable bars each carrying at its opposite end a cross arm, a guide for both bars in which they are freely slidable to cause their cross arms to engage and disengage an element of said flasks, and clamp means adapted to force said bars together and press down their cross arms against the flask elements to hold the flasks rigidly in position on the jolt table during the ramming operation.

2. In combination, a jolt table having a pair of hub patterns fixedly mounted thereon, vertical flask guides rigidly mounted on the jolt table about said patterns, the guides between the patterns being connected by a transverse slotted member, arms overlapped and freely slidable through said-slotted member between its guide faces, cross arms at the outer ends of said bars adapted to assume position over a hub portion of flasks mounted on said hub core pattern plates, and a vertical clamp screw mounted in said slotted member and adapted to press said cross bars downwardly against each other and their cross said bars adapted to assume position over the hub flange of both flasks when mounted over said pattern plates, and a vertical clamp screw mounted in said guide and adapted both to press said cross bars downwardly against each other and to hold their cross arms firmly against the flask flanges, and said guides being vertically elongated to prevent lateral movements of the flasks while being stripped until their hub prints have cleared said hub patterns.

ROBERT A. RUSSELL.

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