US893569A - Apparatus for venting cores. - Google Patents

Description

PATENTED JULY 14, 1908.

W. E. CLIFFORD. I APPARATUS FOR VENTING OORES.

APPLICATION FILED JAN.15.1908

W 60 W 7) on zm s UNITED STATES PATENT OFFICE. WALTER E. CLIFFORD, OF HOPEDALE, MASSACHUSIFFTS, ASSIGNOR TO DRAPER COMPANY,

OF HOPEDALE, MASSACHUSETTS, A CORPORATIONCF MAINE. I

APPARATUS FOR VENTING CORES.

Specification of Letters Patent. 7

Application filed January 15, 1908. Serial No. 410,898.

To all whom it may concern:

Be it known that I, VVALTER E. CLIFFORD, a citizen of the United States, and resident of Hopedale, county of WVorcester, State of Massachusetts, have invented an Improvement in Apparatus for Venting Cores, of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawing representing like parts.

This invention has for its object the production of apparatus for readily and quickly venting a gang or group of cores used in metal founding.

WVhere a large number of cores of a similar character are used they are formed in a corebox containing a large number of molds in which the cores are formed, and it is necessary to vent the cores so that the gases generated by the molten metal may escape without injury to the mold or the casting.

The venting of the core is usually performed by thrusting into it a thin rod or pin, and the present invention provides a simple apparatus whereby a gang or group of cores may be vented simultaneously, while they are in the core-box. This mode of procedure facilitates the core-making o eration and is attended with no liability o' damaging the core.

Figure 1 is a front elevation of a core-venting apparatus embodying one form of the present invention; Fig. 2 is a top plan view thereof.

In the present embodiment of the invention a flat, rectangular and preferablymetallic plate 1 constitutes a base, Fig. 1, having a series of apertures 2, see dotted lines Fig. 1, formed therein, one for each of the venting pins 3. These venting pins are long, slight metal rods of suitable diameter to form the vents, and each one at its lower end loosely enters one of the holes 2 in the base, the upper ends of the pins being fixedly held in a carrier.

The carrier is shown in Fig. 2 as a rectangular frame 4 having a series of parallel longitudinal bars 5, strengthened by cross-bars or connections 6', the upper ends of the pins 3 being securely fixed in the bars, the number and relative position of the pins being determined by the number and position of the core molds in the core-box. Handles 7 are attached to the top of the carrier, at its op- Patented July 14, 1908.

the base 1 at the center thereof and is 'extended upward through a center hole in the crossed portions of two frames 9, 10, preferably made of strap metal and riveted to the carrier, the frames projecting some distance above the carrier as shown in Fig. 1.

Check-nuts 11 are screwed onto the upper end of the guide-rod, above the crossing of the frames, and a spiral spring 12 is coiled around the guide-rod between the base and the top of the frames, said spring normally holding the carrier and base separated, as in full lines Fig. 1. The check-nuts are adjusted so that the lower ends of the venting pins 3 will be housed within the base when the spring is expanded, the frames 9 and 10 serving to stiffen the guide-rod and the latter, with the pins 3, prevent any lateral displacement of the base and carrier.

In using the apparatus the base is set on top of the core-box with the gang of pins 3 over the upper ends of the cores therein, and the operator then grasps the handles 7 and presses the carrier steadily downward, the venting pins depending therefrom sliding through the base and into the cores, to form the vents therein. The dotted lines in Fig. 1 show the ins projected below the base, the correspon ing position of the carrier being also shown in dotted lines. I

In order to positively limit the operative movement toward the base adjustable stops are provided, shown as threaded rods 13 passed through threaded holes in the frame 4 of the carrier, preferably diagonally opposite each other, each stop having a check-nut 14 and a milled or other head 15. The stops are set at such a distance from the base as it is desired the venting pins shall enter the cores, so that when the pins have been pro j ected the requisite distance the ends of the stop will engage the base and prevent further operative movement of the carrier. When the cores have been vented the carrier is re-' leased and it is elevated by expansion of the spring 12, thereby returning the apparatus to normal position, the ascent of the carrier retracting the venting pins from the cores.

It will be manifest that the movement of.

the pins is direct and accurate, it is regulated positively, by the means described, and said pins are Withdrawn smoothly and without ateral movement, the apparatus enabling a I loosely extended through the carrier, a spring normally separating the base and carrier, and means to limit the spring-induced separation of said parts and prevent withdrawal of the free ends of the pins from the base, downward pressure on the carrier compressing the spring and projecting the lower ends of the pins beyond the base and into a group of cores, to form vents therein.

2. In a core-venting apparatus, an apertured base, a carrier having a gang of depending venting pins longitudinally movable through the apertures in the base, separate means to guide the movement of the carrier toward the base, to project the pins beyond the base and into the cores, means to yieldingly separate said base and carrier, and ad justable means to positively limit the operativemovement of the carrier to project the venting pins' 3'. In a core-venting apparatus, an apertured base adapted to rest upon the to of a corebox, a carrier movable toward anc from the base and having an attached group of venting pins extended slidably through the base, to pass into and form vents in the cores in a core-box, a spring interposed between the base and carrier, to lift the latter and retract the pins from the cores, means to limit the separation of the base and carrier, and adjustable stops on one of said parts to en gage the other part and thereby limit movement of the carrier to project the pins into the cores.

4. In a core-venting apparatus, a base adapted to rest upon the top of a core box, a

' yieldingly-sustained carrier movable toward and from the base, a plurality of venting pins rigidly attached to the carrier and movable longitudinally through the base, to pass into the cores, when the carrier is depressed,

means to limit movement of the carrier to retract the pins, and means to determine the extent to which the pins shall be projected beyond the base by operative movement of the carrier.

5. In a core-venting apparatus, a base adapted to rest upon the top of a core-box, a yieldingly-sustained carrier movable toward and from the base, a plurality of venting pins rigidly attached to the carrier and movable longitudinally through the base, to pass into the cores, when the carrier is depressed, means to limit movement of the carrier to re tract the pins, threaded -stops extended through the carrier, to engage the base and thereby limit the extent to which the pins shall be projected by operative movement of the carrier, and check-nuts to lock thestops when adjusted.

6. In a core-venting apparatus, a base adapted to rest upon the top of a multiple core-box, a carrier movable toward and from the base, a gang of venting pins mounted on the carrier and longitudinally movable through the base, to enter the cores and vent the same simultaneously when the carrier is depressed, and adjustable means to limit the movement of the carrier toward the base, to thereby limit the penetrative movement of the venting pins.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

WALTER E. CLIFFORD.

Witnesses:

ALEXANDER P. DAVIS, EDWARD DANA Oseoon.

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