US573643A - Core-press - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1. M. P. COLEMAN.

GORE PRESS.

IHHIII 3 Sheets-Sheet 2.

[Ih lll JH Patented 1360.22, 1896,

(No Model.)

THEDNDRHKS FEERS C0, PHD'YOUTW., WASHINGTON. D. C.

(No Model.) I 3 Sheets-Sheet 3.

M. P. COLEMAN.

GORE PRESS.

No. 573,643, P-atented Deo. 22, 1896. as w f L mlb-kl 1 Mmmm m;

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UNITED STATES PATENT OEEICE.

MICHAEL P. COLEMAN, OF BOSTON, MASSACHUSETTS.

CORE-PRESS.

SPECIFICATION forming part of Letters Patent No. 573,643, dated December 22, 1896,

Application iiled December 14, 1893. Serial No. 493,672. (No model.)

To all whom t may concern.-

Be it known that I, MICHAEL P. COLEMAN. a citizen of the vUnited States, residing at Boston, in the county of Suffolk and Commonwealth of Massachusetts, have invented a certain new and useful Improvement in Core- Presses, of which the following is a specification.

My invention relates to core -presses or presses for forming the cores or internal molds used in metal founding; and it consists in the devices and combinations hereinafter described and claimed.

Commonly cores for large pipes, hollow columns, and many other articles are made in longitudinal halves and stuck together, and if the joining of the halves of the core is carelessly performed the overlapping edges of the halves of the core make thin places in the pipes or columns and render them unfit to sustain great weights or pressures.

The object of this invention is to make such cores without longitudinal division, to make them with great accuracy and rapidity, and, where large numbers of similar cores are required, to make such cores cheaper than they can be made by the usual method, which cont sists in ramming the sand or other core material in boxes by hand.

By the use of the core-press hereinafter described perfectly homogeneous and perfectly-shaped cores may be made, eifecting a saving of metal, and where the cored surface requires to be finished subsequently, as in the case of eyes to receive axles or shafting, a saving of labor in turning or otherwise smoothing such surfaces.

In the accompanying drawings on three sheets, Figure l is a vertical section on the line l l in Fig. 2 of a core-press containing my improvement; Fig. 2, a plan of the same, a part of the connecting-rod being broken away and the lever being shown in horizontal section; Fig. 3, a horizontal section on the line 3 3 in Fig. l Fig. 4, a vertical section on the line 4 4. in Fig. 5; Fig. 5, a plan of said core-press; Fig. '6, a horizontal section on the line 6 6 in Fig. l2; Fig. 7, a horizontal sec-- tion on the line 7 7 in Fig. 12; Fig. 8, a horizontal section on the line 8 8 in Fig. 12; Fig. 9, a vertical cross-section on the line 9 9 in Fig. 2; Fig. l0, a horizontal section on the line lO 10 in Fig. l2; Fig. ll, a horizontal section on the line ll l1 in Fig. l2; Fig. l2, a rear elevation of the core-press, omitting the lever.

The frame A of the core-press consists of a cap a anda base a', connected by a suitable n-umber of uprights a2, each passing through said cap and base, which are held parallel with each other by nuts a3 a4, which turn on the threaded end portions a5 of said uprights and press and hold said cap and base against shoulders a a7 on said uprights, the lower nuts a4 serving also as feet on which the press stands in a well-known manner. To the upper surfaces of the cap ct and base a' are secured the stationary-plungers b b of the hydraulic presses B B', said plungers b b' being preferably cast in one piece with said cap and base, respectively.

The movable cylinders b2 b3 of the hydraulic presses B B are provided with suitable packing-rings b4 b5 to prevent leakage between the plungers b b and said cylinders, and water or other iluid is introduced to the chambers h6 bT of said cylinders through suitable inlets bs b9, arranged in the stationary parts of said presses, respectively, in an obvious manner and substantially as usual, eX- cept that the cylinders are commonly the stationary parts of such presses. Facing the open ends of the cylinders at the bottom of said cylinders prevents, to a great extent, the entrance of dust. The upper cylinder b2 is guided by its plunger and by a die-holder C, provided with arms c, having at their extremities sleeves c', which embrace andslide freely on the uprights a2, said die-holder having ears c2, connected by rods e3 with similar ears b1@ ou said upper cylinder, said rods passing through nutsci, placed above said ears 1910, Figs. 1,4, 9, and l2.

The cylinder b3 is guided by its plunger b and by sleeves bu, which are carried by arms Z913, projecting from said cylinder b3, said lastnamed sleeves surrounding and sliding lfon the uprights a2. The upward movement of said cylinder b3 is limited by ears Z715 on said cylinder striking against nuts b, which turn on the threaded upper ends of stop-rods bw,

which pass vertically down through said ears ICO and are secured in the base a', said nuts b being adjustable on said rods and being held in place by check-nuts b21.

The hydraulic presses B B are operated independently ot' each other.

The core-plate D, Figs. l, 4, and 9, rests upon the top of the lower cylinder b3 and has legs d, which enterdepressions Z222 in said cylinder and prevent any lateral or rotary motion of said core-plate. Said core-plate has as many core-pins d as there are cores to be made at one operation ot' the machine, the core-pins being frustums of cones and forming the vents of the cores and, owing to their shape, being readily withdrawn from the cores after the same are baked. The legs cl support the core-plate in the baking-oven and allow the heated air to pass under the coreplate, baking the cores in a shorter time.

The core-cylinder or die E is held in a central aperture c4 in the die-holder C by means of on'e or more set-screws c5, Figs. l and 3, which turn in said die-holder and thrust radially against said core-cylinder and by the pressure thereon of the slide-plate F, said die E having at its upper end an external 'annular iiange e, which rests upon thetop of said die-holder within a vertical annular iiange'c6 on the top of said die-holder, and the slideplate F rests upon the top of the core-cylinder and is held down upon the same by nuts ff, which turn on the above-mentioned connecting-rods c3 against the top of said slideplate, said rods c3 passing through arms f f', with which said slide-plate is provided, as shown in Figs. l, 4, 9, l0, and 12.

The core-cylinder E has as many die-openings e as there are corepins cl', said die-openings being represented as hollow cylinders, but being in practice of any other desirable horizontal cross-section, and the slide-plate F is provided with a central'aperturef'?, large enough to allow all the punches ghereinat'ter named to pass through said slide-plate into said die-openings when said slide-plate and the core-cylinder are raised, as hereinafter described.

The punches g are equal in number to the die-openings e and are of a size and shape to enter and iit said openings and are fast in the punch-plate G, vsecured by bolts gtothe under side of the stationary cap ce, Figs. l, 4, 9, and l2, the slots g2 in said punch-plate through which said bolts pass being large enough to allow of a slight lateral and rotary adjustment to bring the axes of said punches in line with the axes of the die-openings e', such lateral adjustment being assisted by means of radial screws g3, which turn in ears @8,cast or otherwise secured on the bottom of the cap a and thrust against the sides of said punch-plate. The punches'g are represented as Vitted in holes gl-in the punch-plates and as having iianges g5, which rest upon the top of said punch-plate and are :clamped between said punch-plate yand the cap ct by the bolts tg' more uniformly andv of said slide-plate.

above mentioned, said bolts gbeing supplied with check-nuts gs, which turn against the bottom of said cap, and with other nuts g?, which turn against the bottom of said punchplate and hold the same when properly adj usted.

The slide-plate F is provided on top with ledges f3, grooved at f4 on their inner faces and arranged on two opposite sides of the aperture f2, and a bracket or table Fl is provided'with ledges f5 and grooves f6, which form a continuation of the grooves and ledges of said slide-plate when the tops of said slideplate and bracket are in the same horizontal plane. A sand-box H (really a box without top or bottom) is provided with external iianges h, which slide in the grooves f4 f6 when the box is moved over said bracket and slide-plate, the sides of said box reaching down to said bracket and slide-plate and said box H being provided at its outer end with ears h', between which is pivoted at h2 one end of a link h3, the other end of said link being pivoted at h4 to a hand-lever Il', the lower end of which lever is pivoted at h5 to a stand h6, bolted to the floor.

previously filled with sand or other core material, may be moved over the central opening f2 of the slide-plate, where the'contents of the box will fall into said central opening and into the die-openings beneath, iilling said central opening, when by moving said lever and sand-box in the other direction the core By moving Vthe lever H in one direction the sand-box,

IOO

material will be struck olf level with the top A The bracket F' is provided with a sleeve f7, which receives the top ofthe vertical post f8 and to which it is securedby a set-screw ff in said sleeve, said post being vertically adjustable in a hole a9 j in the base a by means of nuts. f1 fn, which turn on the threaded lower end of said post above and below said base a' to bring the top of said bracket on a level with the top of said side plate, said post being steadied 'by wings f12 and guide-sleevesf13, sliding on uprights a2.

Evidently the length of the cores will be limited by the thickness of the core-cylinder, their diameter by the size of the die-openin gs, and their density, other things being equal, by the thickness of the slide-plate or the amount of core material that can be placed in the central openin gs f2. Hence the punches, dies, and slide-plate are all made removable that others may be substitutedfor them when it is desired to vary the characteristics of the cores.

When the central opening f2 is filled and the sand-box is drawn out from under the punches, the lower cylinder b3 is forced upward a distance-limited by the nuts?)17 on the stop-rods Z219, raising the slide-plate, core-cylinder, and the core-plate and forcing the core material into the die-openings e', and at the IIO same time Vraising the upper cylinder b2.

When the lower cylinder is stopped by striking the nuts b, the pressure is shut off from said lower cylinder by any well-known automatic means or by hand, and pressure is admitted to the upper cylinder b2, raising the latter until the bottom of the die-openings e are at a level or above the lower ends of the punches g, drawing the core-cylinder off the cores and leaving said cores on the core-plate D, which stops when the lower cylinder b3 stops. lVhen the core-cylinder is raised to the required height, the pressure is shut off from the upper cylinder, and the lower cylinder is lowered toits normal position, and the core-plate with the cores supported is placed on a truck and run into the bakingoven, another core-plate is placed on the lower cylinder b3, and the upper cylinder b2 is lowered, and the operation is repeated.

Cores made as above described may be used for forming the eyes of pulleys, car-wheels, and similar articles, and by making the corepins long` enough to form vents entirely through the cores a number of such cores may be placed end to end and held together by a long bolt running through them all and provided at its ends with nuts and washers, as shown in another application, Serial No.

493,673, filed herewith, the hollows g8 in the lower ends of the punches forming core-prints on the cores to enter the large ends of the vents in adjacent cores.

With the core-press above described two men, one to operate the press and one to remove the cores, may make a much larger number of cores in a given time than could be made by the labor of many men following the usual methods.

I claim as my invention- The combination of the independently-operating upper and lower presses, the coreplate carried by said lower press, the die-cylinder, resting on said core-plate and connected with the cylinder of said upper press, and the stationary punches, as and for the purpose specified.

In witness whereof I have signed this specication, in the presence of two attesting witnesses, this 28th day of November, A. D. 1893.

MICHAEL P. COLEMAN. lVitnesses:

ALBERT M. MOORE, JOSEPH NoREIs.

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