US2088736A - Means for supporting core bars in flasks - Google Patents

Description

Aug. 3, 1937. H. e. FLOYD ET AL MEANS FOR SUPPORTING CORE BARS IN FLASKS Filed Oct. 27, 1936 Patented Aug. 3, 1937 UNlTED STATES PATENT OFFICE MEANS FOR SUPPORTING CORE BARS IN FLASKS Application October 2'7, 1936, Serial No. 107,888

3 Claims.

This invention relates to new and useful improvements in means for supporting core bars in flasks, and embodies certain improvements over the McWane Patent 2,042,907, issued June 2,

In the McWane patent, a single clamping means is employed at each end of the flask to clamp both cores. With such an arrangement when one core is properly adjusted there is the possibility of accidentally altering that adjustment during the adjustment of the second core.

Therefore, it is desirable to provide separate means whereby each end of each core can be clamped and adjusted independently of the other core.

The principal object of this invention is to provide a flask in which a plurality of cores are set horizontally, wherein means are provided to set each end of each core separately and independently of the other core.

a With the above and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawing.

In the drawing:

Figure l is a top plan view of a drag of a flask equipped with our invention,

Figure 2 is a left end elevation thereof,

Figure 3 is a transverse section taken, on line 33 of Figure 1,

Figure 4 is a detail vertical section taken on the line 4-4 of Figure 3, and Figure 5 is an enlarged detail showing the clamp in its inoperative position.

Like reference numerals designate corresponding parts throughout the several figures of the drawing.

Referring to the drawing in detail, a horizontally disposed flask drag 5 supports cores A, A, consisting of the usual sand coated core bars having a bell end 6 and a spigot end I, in the manner shown in Figure l. The drag 5 comprises longitudinally extending side walls 8, 8 connected by an end wall 9 having recesses II], III for receiving the bell ends of the core bars and an end wall II having recesses I2, l2 for receiving the spigot ends thereof. Plates I3, I4 extend across the drag in planes spaced inwardly from the end walls 9, II and are provided with journals or recesses I5 for receiving and supporting the core bars.

A lug I6 is cast integral with the end wall 9 and is centrally disposed adjacent the upper edge thereof. The lug I6 is provided with a horizontally disposed threaded opening I! which communicates with the recesses I, I0, and engaged in the opposite ends of said openings are horizontally adjustable screws I8, I8, the screws being disposed in substantially the horizontal plane containing the upper surface of the drag. Lugs I9, I9 are cast integral with the end wall 9 adjacent the ends and upper edge thereof. Horizontally adjustable screws 20, 2e are threaded into the lugs I9, I9 and are disposed in the same horizontal plane as the screws I8, I8. I

The adjusting screws I8 and 20 are employed for setting an initial later-a1 deflection of the cores, as explained in the McWane patent referred to above.

It will be observed that manipulation of the screws I 8, 2i] effects only the lateral deflections of the core bars, and in no way disturbs the vertical deflections thereof.

The means for effecting the necessary initial vertical deflection of the core bars are separate from the means described above for effecting the lateral deflections and include lugs 2|, 2|. which project outwardly from each end wall of the drag, and screws 22, 22 whichextend vertically through the lugs and engage the bottoms of the core bars.

Devices B are provided adjacent the corners of the drag 5 for independently clamping the ends of the core bars A, A to permit independent and separate adjustment of the vertical deflection of either core bar without affecting the position of the other.

To this end each device B includes a shaft 23 which extends longitudinally of the drag, and is located adjacent the side wall 8 between the end wall 9 and the plate I3. The shaft is supported on the end wall 9 and plate I3 by screws 24, 24 which are threaded into the ends of the shaft. A sleeve 25, which is shorter than the shaft 23, is rotatably and slidably mounted on said shaft. An arcuate clamping arm 26 is rigidly secured to one end of the sleeve 25 and overhangs the adjacent end of the adjacent core bar.

The arm 26 is integral with the inner end of the sleeve 25. A rectangular bearing collar 21, having a lower bearing wall, is mounted adjacent the outer end of the arm 26. The collar 21 is capable of vertical movement with respect to the arm 26, and is held in place by a clamping screw 28 which passes through an opening 29 in the top wall of the collar. The screw is threaded into the arm 26, and the lower end thereof engages the bearing wall of the collar. An inwardly extending stop lug 30, which is cast integral with the side wall 8 of the drag is centrally located between the end wall 9 and the adjacent transverse plate l3. The inner face of the lug is located in substantially the vertical plane containing the longitudinal axis of the shaft 23, and is located in spaced relation to the adjacent core bar a sufficient distance to allow the arm 26 to be positioned therebetween. The inner side edge of the lug is spaced from the plate l3 to form a resultant recess 3| for receiving the clamping arm 26 when the latter is in its inoperative position. The devices B and the screws 22 preferably are duplicated at the spigot end of the flask drag so as to facilitate adjustments of vertical deflection of the core bar in the manner generally described in the McWane Patent 2,042,907 hereinbefore referred to.

In operation, when preparing the mold and core assembly for pouring, the clamping arms 26 are individually swung inwardly until the clamping screws are disposed directly over the cores. These clamping arms are then moved outwardly along their shafts 23 until the arms register with the stop lugs 30. Each screw 28 is then manipulated to effect the desired downward pressure and resultant upward deflection of the core, the downward movement of the screw being resisted by engagement of the arm 26 with the stop lug 3B. The vertical screws 22, 22 at each end of the drag are then manipulated to engage properly the bottom of the cores and effect downward deflections thereof. The amount of vertical deflection is indicated by gages provided for that purpose. The screws I8, are then manipulated in a manner to effect deflection of the core bar in a direction necessary to compensate for the lateral pressure exerted by the molten metal entering the mold. The manipulation of these screws I8, 20 effects only the lateral deflections of the core bar and has no effect at all upon the vertical deflection thereof. When it is desired to remove the cores, the screws 28 are first released, the arm 26 is then moved along the shaft 23 until the arm is in register with the recess 3|, and finally the arm is swung into the recess to its inoperative position which permits the core to be lifted without contacting said arm.

It is of course to be understood that the details of structure and arrangement of parts may be variously changed and modified without departing from the spirit and scope of our invention.

We claim:

1. The combination with a flask section including side walls and end walls, of a core bar supported horizontally therein, and means for effecting an initial vertical deflection to said core including a stationary shaft supported on the flask section at one side of the core and extending in parallelism therewith, a stop lug rigid with the side wall of the section and disposed above the shaft, a clamping arm slidably and rotatably mounted on the shaft, said arm when in operative position being interposed between the stop lug and the core and when in inoperative position being located at one side of the lug, and a clamping screw mounted in the free end of the arm for exerting a downward pressure on the core when the arm is in its operative position.

2. The combination with a flask section including side walls, end walls, and a transverse plate, of a core bar supported horizontally therein, and means for effecting an initial vertical deflection to said core including a stationary shaft supported on the end wall and plate at one side of the core and extending in parallelism therewith, a stop lug located centrally between an end wall and the plate and rigidly connected to the side wall, a clamping arm slidably and rotatably mounted on the shaft, said arm when in operative position being interposed between the stop lug and the core and when in inoperative position being located between the lug and the plate, and a clamping screw mounted in the free end of the arm for exerting a downward pressure on the core when the arm is in its operative position.

3. The combination with a flask section including side walls and end walls, of a core bar supported horizontally therein, and means for effecting an initial vertical deflection to said core including a stationary shaft supported on the flask section at one side of the core and extending in parallelism therewith, a stop lug rigid with the side wall of the section and disposed above the shaft, a clamping arm slidably and rotatably mounted on the shaft, said arm when in operative position being interposed between the stop lug and the core and when in inoperative position being located at one side of the lug, a collar mounted on the free end of the clamping arm for vertical movements relative thereto, and a clamping screw mounted in the arm for forcing the collar downwardly against the core when the arm is in its operative position.

HENRY G. FLOYD. JAMES D. SAMPLE.

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