US84305A - Improvement in moulding gear-wheels - Google Patents

Description

WARREN ROVVELL,l OF NEW YORK, N.. Y., ASSIGNOR TO HIMSELF AND JOHN HECKER, OF SAME PLACE.

Lette/rs Patent No. 84,305, dated November 24, 1868.

To all whom it may conce/ra Be it known that I, WARREN ROWELL, of the city,

county, andState of` New York, have invented a new and useful Improvement in the Method of Moulding Double-Gear W heels; and I hereby declare that the following is a full and exact description of my improved method, reference being had to the accompanying drawings, forming a part of this specication, in which- Figure 2 is a face view of one side of the plate, with the patterns attached thereto.

Figure 1 is an elevation.

Eigure 3 is a section through the line X'X.

Figure A is 'a perspective view`of the castings when completed.

Similar letters of reference indicate corresponding parts in all the figures. v

lhe castings which I produce by my method are the' peculiar castings described in my patent dated September 3, 1867, for use in gearing the rolls of clothesywringing machines. It is impossible to cast these by any ordinary process without the aid of a core. My invention casts them without the aid of a core.

The diiculty lies in the production of the groovelinev of the gear, and an exterior diameter, somethingl greater than the extreme points ofthe teeth, it being understood, of course, that the port-ion extending beyond the tee-th is for the purpose of taking hold in the sand, of the mould, to hold the inner and useful portion of the core in place.

I have discovered thatby skilfully dividing such core in to parts, and attaching the parts alternately, lirst `to the one part of the mould, and then to the other,

the core thus divided will perform the same as usual. And I have discovered that the core thus divided gives a form of the parts which may be moulded in green sand entirely, without involving any more labor or skill than that possessed by the ordinary moulder. In other words, I can by this means make the core, if it so be called, in green sand, as a part of the ordinary green` sand mould, care being taken, in forming the pattern, to make the alternate divisions of the part corresponding to the core, and which I call the greensand core, carefully adapted to each other, so as to match perfectly together.

I have made, also, some improvements in the means of carrying out my invention.

It may he said that my invention consists in certain novel means of causing the spaces between the teeth, in the direction ofthe line ofthe axes of the wheels, to be produced without the aid of, and thereby saving the labor of making a dry-sand core, so that when the two sides of' the plate or plates having corresponding sides have been moulded on, and the two moulds put t0- gether, the casting produced shall be the same as that now produced by the dry-sand cor.

In order to do this, I recess the plate to the depth of one-half the usual dry-sand core, then take a ring, shown in section at O, fig. 3, that shall t the recess in the plate, and rise abovethe plate the sameheight, or nearly, and divide it into twice the number of parts as there are teeth in the Wheel.

I place in the recess under each toothin the wheel, n

shown in plan, fig. 2, a', a", Sac., one ofthe said parts, care being taken to have eachportion of the ring so bevelled that it shall leave the sand readily.

As both sides ofthe plate, with the pattern attached, or the two sides of corresponding plates are nearly alike, only one side ofthe plate and one-half pattern are shown in' the drawings.

By nicely adjusting the plate to the flask in which the sand is moulded, and the pattern or half pattern properly adjusted to the plate, one plate is sucieut to mould the two sides ofthe dask .by turning over the plate.

In order to allow for a lateral motion'of the pattern in regard to the plate, I leave a space between the plate and pattern, shown at e e, iig. l, and place therein an elastic material, so that on rapping the plate on its al# ternate sides and ends, the patterns, on being moulded, are loosened in the sand, and thereby are the more readily withdrawn without marring the sand, the elas' tic material fitting so close as not to allow the sand to get in the joint, but still not having lateral pressure enough to overcome the weight of the pattern, the pattern being attached to the plate in any suitable manner to allow of this lateral motion.

It may, however, be convenient to have the patterns so attached to the plate that in order to withdraw-them yfrom the sand the pattern will leave the plate on being moulded, and remain in the sand on lifting offtheplate, and then be withdrawn. In this case the elastic material may be dispensed with, and the pattern loosened in the sand, by rapping, as is ordinarily done.

As the circumstance of asks and sand is s0 well known to moulders, it is not necessarily shown.

In order to diminish the cost of patterns when more than one is wanted, I make asuitable metal pattern, with a portion of the plate attached, (a circular portion preferred,) and multiply them by the electrotypeprocess, and recess the main moulding-plate, as shown in the dotted line a n, iig. 1 and iig. 3, and place the eleetrotype patterns in thesaid recesses. By this means from one to ten 0r more Wheels can be moulded at one time.

What I claim as my invention, amd desire to secure l. Moulding my double-gear wlieel-Awith the groove between the two series of teeth, by in eeet dividing the core into parts or steps, and mounting the parts alternately in the opposite asks, and forming them of green send at the same time the main parts are formed, substantially its for the. purposes herein set forth.

2. The introduction of an elastic-substnnee between the pattern :und plate, as described Witnesses ALFRED HOWELL, EDW. HOWELL.

WARE

EN HOWELL.

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