US517387A - Core-box - Google Patents

Description

(No Model.) e

G. A. LAMBERT.

GORE BOX.

No. 517,387. Patented Mar. 27, 1894.

Suva whee UNInD STATES PATENT FFICET GEORGE A. LAMBERT, OF UNION CITY, OHIO.

CORE-BOX.

SPECIFICATION forming part of Letters Patent No. 517,387, dated March 27, 1 894.

Application filed July '7, 1893. Serial No. 479,839. (No model.)

To all whom it may concern:

Be it known that I, GEORGE A. LAMBERT, a citizen of the United States, residing at Union City, in the county of Darke and State of Ohio, have invented certain new and useful Improvements in Apparatus for Making Oores, of which the following is a specification, reference being had therein to the accompanying drawings, in which Figure 1 is a perspective view of an ordinary tuft cutter or die; Fig. 2 a perspective view of the sand-core ready for use; Fig. 3 a perspective View of the core-box; Fig. 4 a vertical section thereof, and Fig. 5 a vertical section of the core-box and core therein.

This invention has-reference to the manufactu re of cores to be used in casting the wellknown steel tuft cutter or die shown in Fig. 1, which consists of an open tubular body formed cylindrical at its lower end, the interior of this cylindrical portion being longitudinally fluted or grooved and its lower end being dressed off to a cutting edge having the configuration of the tufts to be cut.- In the making of these tools it has been the custom for many years to first cast them, using plain tapering cores, which were formed in the usual manner in two part boxes, and then form the interior grooves (which are substantially semi-circular in cross-section) by drilling and the exterior of the cutting edge by dressing or grinding off the surplus metal in the usual manner.' This method is costly and makes the market price of the tool unnecessarily high. It is rendered costly principally by the comparatively laborious drilling operation required to form the interior semicircular flutes. And as a core that would form these grooves in the casting of the tool could not be made on account of the flutes, by the usual method of making the cores, it was considered that the drilling was an unavoidable necessity and that method has therefore been practiced for many years, notwithstanding the continued demand for a cheaper tool of this character.

It is the object of this invention to simplify the method of making this tool and reduce its cost to a minimum, this being accomplished by doing away with the drilling operation, this part of the process having heretofore added fully four-fifths to the cost of the tool.

In carrying out this invention the core (as shown in Fig. 2) a, throughout its length is formed tapering toward its lower end, and on its lower end is formed a series of longitudinal beads a, which terminate against an annular shoulder a" formed on the core a suitable distance from its lower end. The core is formed in a core-box b which is a solid open-ended tube, having formed in its interior a series of semi-circular grooves b which extend from its lower end upward a distance equal to the length of thegrooves desired in the finished tool. From the upper ends of the grooves the interior of the core-box enlarges gradually upward to its upper end to facilitate the removal of the core and impart to it the necessary taper. The fluted portion of the box is preferably without taper. In making-the core, the sand is packed into the core-box through its upper end until it is entirely filled; it is then removed by forc ing it on dwise from the box by pressing against its lower exposed end, the upward enlargement of the interior of the box above the flutes permitting the core to pass out readily and without injury. One advantage in having the flutes extend entirely to the end of the core-box, whereby the entire surface of the core will be exposed, lies in the fact that a pushing tool having the configuration of the lower end of the core may be applied thereto in forcing it out of the box, thereby avoiding injuring it. It will be observed that this core could not be formed with the ordinary twopart core-box as the peculiar formation of the lower end of the core would prevent its withdrawal from the box without injuring its scalloped portion; it is this reason that has compelled the designing of another method of forming the core- It will be seen that by this core-box the cores may be formed not only quickly and truly, but also with a uniform density, thus still further cheapening the cost of manufacture of the tool. By means of this core the tool can be cast with its interior fluted, the, flutes being as true and smooth as those formed by drilling, thus avoiding the expensive operation of drilling the flutes in the tool after casting.

It is obvious that the only part of the corebox it is absolutely necessary to form solid and open-ended is the fluted part; the upper tapering part of the box may therefore be formed in two parts if desired, although that construction is hardly deemed advisable.

Having thus fully described my invention, whatI claim is- 1. Acore-box formed ofa tubehaving formed on its interior a series of flutes, said fluted l portion extending from its lower end upward a suitable distance and the interior of the box 10 from the fluted portion upward being enlarged, substantially as described.

2. A core-box formed of an open-ended tube

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