US2412425A - Foundry sand sifting and flaskfilling apparatus - Google Patents

Description

Dec. 10, 1946. H. H. RAWSON ,4 5

7 FOUNDRY SAND SIFTING AND FLASK-FILLING APPARATUS Filed Sept. 6, .1944 2 Sheets-Sheet l l I "m ,3

41; I I I E "I I I I /f I I I I I I I I I I o I 1 I Bnuentor V Harry/V. Wan 30 I (Ittdrhcg Dec.10,1946.' .H, AW 2,412,425

F OUNDRY SAND SIFTING AND FLASK-FILLING APPARATUS I g, I 7 3 i 3nnentor so 39 Harry H Ra WSO/Z Patented Dec. 10, 1946 FICE,

FOUNDRY SAND SIFTING AND FLASK- FILLING APPARATUS Harry E. Rawson, Spokane, Wash.

Application September 6, 1944, Serial No. 552,906

This invention relates to a flask-filling apparatus and it is one objectof the invention to provide an apparatus by means of which flasks used by moulders in a foundry may be quickly and very easily filled with sand which has been sifted inorder to remove foreign matter.

Another object of the invention is to provide a flask-filling apparatus wherein a hopper for holding sand may be supported above a frame mounted for reciprocating movement over a bag and carrying a screen or riddle through which the sand passes so that only clean sand will drop into the bag. 7

Another object of the invention is to provide the frame with a riddle support so mounted that it may be released and swung downwardly to inoperative position allowing removal of the riddle for cleaning and replacement after cleaning.

Another object of the invention is to provide the apparatus with a bag for receiving clean sand, the bag being tapered toward its lower end which is open and surrounded by a ring having handles by means of which the lower portion of the bag may be turned upwardly and thus closed to retain sand in the bag.

Another object of the invention is to provide improved means for holding the lower portion of the bag in folded position after a flask has been filled with sand.

Another object of the invention is to provide an apparatus of this character which is simple in construction and very easy to operate.

In the accompanying drawings:

Fig. 1 is a side elevation of the flask-filling apparatus with portions in vertical section.

Fig. 2 is a view on the line 2--2 of Fig. 1.

Fig. 3 is a sectional view on an enlarged scale taken through the riddle and its support, on the line 3-3 of Fig. 2.

Fig. 4 is a fragmentary View showing the lower portion of the hopper and the riddle-carrying support suspended therefrom.

This improved flask-filling apparatus has a base I carrying a vertically adjustable support or lift 2 upon which the flask 3 to be filled with sand is placed. This lift has a conventional pneumatic lift construction and is actuated by the usual lever 4 so disposed that it may be operated by pressure applied to it by an operator standing in front of the apparatus. A second pneumatic lift 5 is located back of the lift 2 and its cylinder 6 carries a plate I which is swung over the flask after the flask has been filled with sand. The plate is carried by a threaded stem 8 which passes through a sleeve 9 and carries a 1 Claim. (Cl. 209240) .eled into them.

In the improved apparatus, the sand as received at a foundry is placed in a hopper II in any desired manner, where it is stored before being used. This hopper is carried at the upper end of a standard I2 by an arm is and from the hopper extends a bracket M braced by an arm I5 bearing against the standard. The bracket [4 carries a cylinder It in which a piston I1 is reciprocated by air delivered from a source of suppl by a pipe line It controlled by a valve l9, the cylinder l6 and its piston ll being of conventional air-actuated design. At its outer front end the piston I1 is fiXecl toa frame 2% formed 01' strong metal and preferably circular in shape. This frame or ring 20 is provided at opposite sides with trunnions 2| which engage through eyes at lower ends of links 22 suspended from trunnions 23 at opposite sides of the hopper H and when the piston I! is reciprooated in the cylinder [6, reciprocation will be imparted to the frame or ring 20.

Within the frame or ring is disposed a screen or riddle 24 of appreciably smaller diameter than the ring so that it fits loosely therein and may be very easily inserted or removed. The riddle rests upon a frame or support 25 formed of metal rod and of oblong shape. This support or frame extends diametrically of the ring 20 and has its rear cross bar mounted through a bearing bracket 26 at the back of the ring and the cross bar has its front end formed with a forwardly projecting slotted tongue 27 to receive a threaded stem 28 pivotally carried by a bracket 29 so that it may be swung vertically into ngagement with the tongue and the wing nut 30 then tightened to! secure the frame 25 in its raised or operative position where it will support the riddle in the ring 2!). When the ring is reciprocated by action of the piston the riddle will be shaken and stones and trash held in the riddle while lumps of sand will be broken up and all of the sand in the riddle will pass through it. By loosening the nut and swinging the bolt 28 upwardly out of the tongue,

the frame may be lowered and the riddle removed,

cleaned, and replaced, and the sup-port or frame 25 again secured in its raised position.

. 3 Under the ring 28 is a circular frame 3| formed of inner and outer rings 32 and 33 between which fabric and tapered toward its lower end, which is open so that sand may flow out of the bag and into the flask over which the lower end of the bag terminates in spaced relation thereto. The outer ring carries a hinge bracket 35 having at its outer rear end a head 36 formed with a toothed inner side face for interfitting engagement with the similarly toothed side face of the head 31 of a bracket 38 which is fixed to the inner face of the standard l2 below the cylinder IS. A threaded stem 39 extends from the head 36 through head 31 and carries a Wheeled nut 49 which, when tightened, draws the head 36 into engagement with the head 31 and firmly holds l the bracket 35 against tilting movement. Therefore, the ring or frame 3| will beheld in horizontal position and close to the frame 25 so that as the ring 25 is reciprocated by the piston clean sand shaken through the riddle will drop into the bag. 7

When the bag is in the position shown in Fig. 1, sand may flow therefrom into the flask and fill therfiask. After the flask has. been filled, flow of sand from the bag must be stopped. To accomplish this, the lower end portion of the sack or bag is folded upwardly. About its open lower endthe bag carriesa collar 4| from which extend radiating rods 42. One of these rods has a sleeve 43 at its. outer end in which is fixed the lower endof a rod 44. The rod 44 extends vertically with its upper portion slidably en aged through a sleeve 45 carried by the hopper H at the front thereof, and a nut 46 upon the rod limits its;

downward movement through the sleeve. A hook 41 is mounted upon the rod 44 for adjustment longitudinally thereon and when the operator grasps. one or. two of the rods or handles. 42 of the ring and exerts upward thrust, the ring and the rod will be shifted upwardly and the lower; portion of the bag turned upwardly with the ring.

After the rod has been shifted upwardly a sufiicient distance for the hook to overhang the frame 3| and then allowed to move downwardly, the

is secured the upper end of a bag 34 formed of 4 hook catches upon the ring and the bag will be held folded and no sand can flow from its lower end. By adjusting the hook along the rod the extent to which the bag is folded may be controlled. When the flask is to be filled, it is merely necessary to shift the rod upwardly, turn it slightly to detach the hook from the ring 3| and r then allow the rod to slide downwardly to its full extent. The bag will thus assume the position shown in Fig. 1 and sand may flow from it into the flask. When the riddle becomes clogged with foreign matter screened from sand delivered to it from the hopper ll, the wheel nut 41! is loosened and the ring 3| and the upper portion lowered until the ring 3| hangs vertically from the.

A flask-filling apparatus comprising a base, a

standard rising from said base, a hopper sup ported from said standard and spaced upwardly from the base, a riddle mounted for reciprocating movement under said hopper, a fabric bag under said riddle tapered toward its lower end and having rings at its upper and lower ends, rods projecting frornthe lower ring, a rod 'shiftable vertically in front of the hopper and, the bag,

one rod of the lower ring being connected with;

the lower end of said' rod, and a hook carriedby the vertical rod and shiftable thereon to vertically adjusted positions, said hook being shifted vertically with the rod into positionforf engaging the upper ring and holding-a predetermined portion of the lowerend portion of said bag in upwardly folded position to close the lower 'end' of the bag and retain sand in the bag.

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