US2513904A - Mold flask and sand reinforcing means - Google Patents

Description

July 4, 1950 E. H. WHITTAKER MOLD FLAsx' AND SAND REINFORCING MEANS Filed July 29, 1947 =4 lllllll|llllllllllllllllllllllllllllllIll||llllIllINIINIIIHIIIIIIIIIIHUINH I l r 1| LIP l I I l l I I l l l l l l l l I l I I l l l I I I I I l l I I l l I I I I ll INVENTOR, -Whidaker Edward H ATTORNEYS.

Patented July 4, 1950 UNITED STATES PATENT. OFFICE MOLD FLASK 2,513,904 AND SAND REINFORCVING 1 MEANS 1 Edward H. Whittakendrsey City, N. J. g I Application July 29, 1947, Serial No. 764,375

1 Claim. (01. 22-111) This invention relates to the art of molding, and is concerned primarily with the improvement of mold flasks and molding sand reinforcing or binding means.

It is common practice in the production of molds to use pieces of solid material such as wood, metal, and the like, sometimes termed trash as a hinder or reinforcement for the molding sand, especially in the production of relatively large castings or in long slender flasks. This material for binding purposes is partly separated from the sand, after the casting has cooled sufficiently, such as at a shake-out station in'the plant, of which the mechanism shown in my U. S. Patent 2,341,584 granted February 15, 1944, is an example, and finally by sand reconditioning andretemperingstation of which the apparatus in my U. S. Patent 2,347,226 granted April 25, 1944, is an example. This used trash or binder is-troublesome since it tends to clog sieves and much of it cannot be reused for various reasons and presents some transportation and disposal problems.

The principal object of the present invention is to provide sand anchoring projections carried by the flasks and removable sand reinforcing or binder members for cooperation therewith which may be reused a great many times and which remain in the flasks'at the shake out stations so as to not clog sieves, or reach the sand reconditioning and retempering station.

Another object is to provide flasks with sand anchoring projections that selected pairs may be used to support and retainin place bar-like reinforcing or binder members placed, according to the particular mold cavity for effective support of the molding sand, without the necessity of selecting loose binding elements of various sizes andmaterials for this purpose and without the necessity of makingspeoial arbors as has been at times the practice in the past.

Other objects and advantages of the invention will appear in the following detailed description of one embodiment of my invention, taken in connection with the accompanying drawing forming a part of this specification and in which drawing:

Fig. 1 is a plan View of a flask equipped with anchoring and reinforcing means for the sand therein according to the present invention, the cavity in the sand being shaped for the formation of a crank shaft, a portion of the sand being broken away to disclose details. This may be either the cope or the drag of the mold.

Fig. 2 is a cross sectional view thru the mold on substantially the line 22 of Fig. 1.

Fig. 3 is an enlarged fragmentary detail view showing cooperating molding sand anchoring and reinforcing means.

Fig. 4 is an enlarged sectional view on the line 4-4 of Fig. 3.

Figs. 5 and 6 are detailed end and fragmentary top plan views, respectively of the sand anchoring or binding member.

Referring in detail to the drawing, the mold used for the. casting operation comprises the usual two mold sections, namely cope l and drag 8, which, when closed upon each other leave a mold cavity 9 therebetween. For illustrating the invention, the mold cavity. 9 is shaped to form a crank shaft. The manner of forming the cope and drag is well known in the art-and requires only-a brief description. For example, in

order to form the cope, a cope flask I0 is placed overa cope pattern, not shown in the drawing, and sand I l is manually or mechanically tamped into the flask and about the pattern. The flask containing. the imprinted sand is then separated fromthe pattern. Thedrag is formed in-the identical manner by-a drag flask I2, with tamped sand I3. In the drawing no sprue gates and feed gatesare shown since they form 'no part of the invention and may Ice-provided wherever deemed necessary or desirable. After the cope and drag have been formed, the'dragfi is inverted and accurately aligned with the cope 1 to form the-completed mold.

The flasks l0 and i2 may be substantially identical in shape and size' or may be of different sizes and shapes tosuit the requirements of the castings to be made. In the example shown they are of the characterillustrated in my Patent 2,366,581 granted January2, 1945, and each cornprises a rectangular frame I 4 forming side walls [5 and end walls l6,-the end'walls being provided with trunnions H,'centrally located and extending outwardly from the outer faces of their respective end walls. It is between the confronting inner-faces I 8 of the-side Walls l5, and the confronting inner faces [9 of the end walls [6 that the molding sand is tampedand it is in the zone between these faces l8 and I9 that reinforcement for the sand is frequently-required to' prevent it from being accidentally displaced fromsuch zone.-

For the purpose of aiding in the support of the packed sand in the-flasks and assembled mold, such as while inverting the drag, moving the cope to a position thereupon and transporting the mold, I provide a plurality of sand anchoringprojections 20 extending inwardly from the confronting faces l8 and [9 of the frame into the cavity 2| of the flask. Each projection is preferably made from an elongated piece of rolled or cast metal, of I or T shaped cross.

section so as to have at least a web 22 and a head 23. In the example shown the projection is of I shaped cross section and includes a base flange 24 opposite the head 23, this base flange being suitable for securing the projections to the inner faces 18 and I9 of the frame as by welds 25.

frame. cavity 2| of the frame.

I also prefer to bevel the ends of the projections, as at 26 toward the center of the frame cavity, and to locate the ends of the projections a suitable distance inwardly from the opposite faces of the frame as shown in Fig.2. Thisreduces to a minimum likelihood of hand or ma chine operated tamping tools, not shown in the drawing, engaging the projections, and which otherwise result in injury to the projections and tools. This beveling of the projections may be at only the ends of the frame into which the sand is introduced. The beveling, also facilitates de tachably connecting transverse reinforcing or binder members 21, of a character subsequently described, in the flask cavity. The projections 20 may be spaced apart laterally any suitable dis- .4 free end 40 of each tine 35 travels in the arcuate path 4| when the arms 32 are flexed to the various positions shown in Fig. 3 and the crowns of the teeth 38 in a general way travel in the path 42 upon such flexure of the arms. The members 21 are made of suitable lengths to extend crosswise and longitudinally of .the flask cavity and the arcuate companion time 35 at each end of the member 21 are of such shape that when hooked into the space between the head 23 and base flanges 24 of their respective sand anchoring pro- "je'ction 29, some ofthe teeth 38 will engage, with intimate contact, the flanges 24 and the end 40 will engage, with intimate contact, the head 23 effectively preventing accidental displacement of the member 21. It will be noted that the member 21 .may be readily placed with respect to optance and some may not be used to detachably support members 21, but rather function only to support the sand.

Each transverse reinforcing member 2'! preferably comprises a bar-like body portion 28 having an intermediate spring section 29 and means 39 at the ends of the bar-like body portion for de-' tachable engagement with the projections 20. The portion 28 is preferably made of spring metal and the section 29 may be a single spring convolution 3| from which arms32 of the bar portion extend in opposite directions. In Fig. 3 is shown by full lines, the position of one of the arms with respect to the spring section 29. from which it will benoted the latter tends to shorten the overall length of the member 21. The arms 32 may,

however, be acted upon to increase the over-all length of the member 21 as shown by dash lines disposing them in alignment, the tendency of the spring section 29 being, however, to normally dispose the arms 32 in obtuse angular relation with the spring loop convolution 3| inwardly of the vertex. It will be noted from the dot and dash line representation in Fig. 3 that the arms 32 may be acted upon to dispose them in reverse obtuse angular relation, with the convolution 3| outside the vertex. This is of importance when considering typical means 39 for detachably connecting the ends of the bar-like body portion 28 to the projections 20 of the character above described. Each means 30 is preferably of hook-like formation and preferably comprises a cross bar portion 34 at the end of its respective arm 32 and two spaced arcuate tines 35 carried by the bar portion 34, the concave faces 36 of the tines being nearest the spring section 29 as shown in Fig. 3. The convex faces 31 are each provided with a plurality of teeth 38 which, when the member 21 is in use, engage the base flanges 24 as shown by full lines in Fig. 2 and by dotted lines in Fig. 3.

The manner of applying the member 21 to the flask frame is perhaps clear from a consideration of Fig. 3. However, it may be stated that the posite'projections 20 by flexing the arms 32 of member 21 to the position shown in Fig. 3, at

which time the ends 40 of the tines are inthe plane 43 of the inner face of head 23, and-the convex portions of the tines are spaced from the plane 44 of the outer faces of the base flanges 24. Thus the member 21 maybe readily let down into the flask cavity with the tines 31 between the heads and base flanges of the projections 20, when the arms 32 are fixed to the position indicated bydot and dash lines in Fig. 3, and the arms then permitted to'return toward normal position, the intermediate spring section 29 first tendingto increase the over-all length of the member 21 and then diminish such over-all length but restrict in returning the arms to the full line position shown in Fig. 3, by the teeth 38 and terminal ends 40 of the tines 35 engaging the cooperating parts ofthe sand anchoring projections 30.

supporting themoldingisand and to groove the confronting faces of the walls of mold jackets for receiving molds to compensate for irregularities in the outer surfaces of the mold previously formed in a fiask,'however, the arbors are made of a size to serve according to the particular characteristics of the casting to'bemade andare sel dom useful without being modified when they are to be used in the production of different caste ings, and the grooves of the mold jackets are so shallow that they aid only inv preventing the mold from slipping bodily from the jacket and do not reinforce the molding'sand per se. The present invention provides mold fsections or flask frames with integral internal projections which reinforce the sand for a'considerabl'e distance from the inner faces of the frames, and may be used to detachably receive the springy'transverse reinforcing members selectively placed according to the shape of the mold cavity to most effectively aid in supporting the molding sand. Thus the members 21 may be used in flasks for reinforcing the sand, over and over again, with different mold cavities, andwithout modification of the members 21 to suit the particular shape of the mold cavity. r

I claim:

A flask frame provided with sand anchoring projections carried by and extending inwardly from the confronting faces of-the frame, and a transverse sand reinforcing member comprising a bar-like body portion provided with a spring section intermediate its ends, tending to normally shorten the over-all length of the bar-like body, and means on ,the'ends of the bar-like body engaging said anchoring projections when the spring portion is distorted to tension the bar-like Number Name Date body portion. 347,448 Tabor Aug. 17, 1886 EDWARD H. WHITTAKER. 385,203 Riley June 26, 1888 451,017 Baugh Apr. 28, 1891 REFERENCES CITED 5 483,596 Baugh Oct. 4, 1892 The following references are of record in th 721,723 McGuu'e 3, 1903 fil of t patent; 721,831 Phelps Mar. 3, 1903 1,003,549 Tuohy Sept. 19, 1911 UNITED STATES PATENTS 1,321,803 Blackham N0v.18,1919 Number Name Date 10 1,348,445 Press Aug. 3, 1920 106,850 McLaughlin Aug. 30, 1870 1,772,653 White Aug. 12, 1930 190,835 Dimmick May 15, 1877 Y

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