US100172A - Improvement in implement for under-cutting sand-cores in flasks - Google Patents

Description

w. L.. McDOWELL.

Implement for undercutting Sand Cores in Flasks.

Patented Feb. '22, 1870.

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.4; lot-text "fittttt t it - Letters Patent .No. 100,172, dated February 22, 18 70.

IMPROVEMENT IN IIVIPLEMENI' FOR UNDER-CUTTING SAND-CORES IN FLASKS.

The Schedule referred to in these Letters Patent and making part f like S e- I,'W1LLIAM L. MCDOWELL, of the city of Philadelphia, in the State of Pennsylvania, have in vented ceitain Improvements in the Implement for Under- (lutting or lndenting Sand-Cores in the Process of illdolding for Castings, of which the following is a specication.

Nature and Objects of the Invention.

In the process of molding patterns in sand-flasks it often becomes necessary either to under-cut or indent by hand certain parts of such cores as are molded and lifted with the coping, or to make the cores separately and insert them in cavities molded for the purpose in the coping. In molding for the production of the projccting lips of the lifter-cavities in the lids of the stoveplates, the former mode is generally adopted but it;

accurately and firmly over the projecting core to be under-cut or indented, and then compressing the spring the tongue will immediately be caused to penetrate the side of the core and thus make the under-cut or indentation required, and on then relaxing the pressure on the spring, its reaction will instantly withdraw the said tongue and allow the implement to be'removed. Description of the Accompanying Drawings.

Figure 1 is a vertical longitudinal central section of my improved implement as constructed for making the under-cuts or indentations in the sand-cores required in molding for the lifter cavities in the lids of stoveplates.

Figure 3 is a representation of the under sideot' the implement.

Figure 2 is a view of the upper side of the same, having the bow of the spring cut off in order to more fully display the tongue. 1

General Description. A is the plate,-and a its cavity for receiving the sand-core;

B the slide and b its tongue; and

to lay down flat upon the upper, side of the plate A," whilstthe tongue 5 comes fl'ush'with the under surface of the same. (Seefig. 1.)

The slide B with its tongue b is kept in line with the length of the opening in the plate A by the side edges of the. said slide and the guide-ribs a stud,'a of the plate, a slot, Zr",.in the slide B, 211- lowing the latterto'be' moved freely forward and backward within certain required limits.

On the upper side of the slide B there is althumli' or finger-lug, bf", for operating the slide and .to which lug one'end of the bow-spring O is riveted fast.

on the top of the cover of the cavity a there is a like lug, a which forms an abutment for the thumb or finger of the operator in compressing the spring, 0,

the other end of'the latter being riveted fast either to it or to the side of the cover of a, as in fig. 1.

It will now be-lll'itlelstoull, without further descrip- -tion, that when this implement is placed and held firmly in juxtaposition over the core for which it is constructed, and the slide B then pressed forwardby compressing'the spring 0 between ones thumb and.

finger, the tongue I) of the said slide will penetrate the sand-core in at until it reaches the position indicated by the dotted lines 1 c', and then on allowing the spring 0 to react the said tongue will be withdrawn from the core thereby and the implement removed by the operator, leaving the under-cut or indentation required int-he core, the whole operation requiring but a few moments of time, but little skill, and resulting in the production of more perfect work than can be accomplished by either of the old methods.

I claim as my invention 1 The combination with the plate A, provided with suitable cavity, a, for the'reception of the core ofthe sliding tong-ucbi and spring 0, substantially as and for the purpose hereinbefore set foith.

' WM. L. MCDOWELL.

Witnesses:

' BENJ. Momson,

J onn Mnnnmnn.

a on the upper side of the plate A, while the said slide .B is,-' kept down upon the plate A by means of a flanged.-

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