US2457283A - Tungsten carbide tool grinder - Google Patents

Description

TUNGSTEN CARBIDE TOOL GRINDER Filed Jan. 14, 1946 WIN IN VEN TOR.

A TTOKNEY.

Patented Dec. 28, 1948 OFFICE TUNGSTEN CARBIDE TOOL GRINDER Frank P. Slater, Kansas City, Mo. Application J anuary 14, 1946, Serial No. 641,121

3 Claims.

This invention relates to grinding equipment in general, and particularly to grinders for tungsten carbide tools that are preferably sharpened or contoured through the employment of a grindingpelement having among other material, diamond chips or dust, and because of which it is desirable to provide a coolant during the grinding operation.

The provision of such a coolant or a liquid serving as such, is a troublesome problem and grinders have heretofore, been rendered expensive and complicatedbecause of efforts to include therein, means for pumping or otherwise forcing a liquid to the zone of juncture between abrading element and tool being ground. It is one-of the primary objects of this invention, therefore, to provide a grinder with means for automatically directing a jet of liquid, capable of cooling the frictionally engaged surfaces throughout the entire time that grinding of the tool takes place.

A further important object of this invention is to provide a grinder with an adjustable head, capable of maintaining the tool at an angle where the operator may manipulate the same with the desired amount of pressure toward the abrading surface of a specially mounted cup, having as a part thereof, the means for forcing liquid from the lower part of the reservoir to a place where it will come into contact with the tool.

Other objects of the invention are important and will appear during the course of the following specification, referring to the accompanying drawing, wherein:

Fig. 1 is a top plan view of a grinder for tungsten carbide tools, made in accordance with the present invention; and

Fig. 2 is a vertical central sectional view thereof.

The form of the invention chosen for illustration, comprises a reservoir Ill suitably mounted upon such supports l2 as may be adequate to hold the entire assembly in operative position, and a prime mover in the form of a motor l4, the shaft l 6 whereof normally extends vertically.

This shaft is passes through a packing I8, capable of precluding seepage or leakage of liquid 20 from within reservoir l0, and the upper end of shaft I6 carries a cup 22, cast or otherwise formed of a strong substance having a facing of abrading material at its edge and against which the later described tool is drawn during operation of the grinder.

Cup 22 has its annular side wall 24 flared or projected upwardly and outwardly from the base 26 of cup 22, and it is the upper, annular edge of this wall 24 that is brought against the tool. A duct 28 disposed at an angle with respect to the-axis of rotation of shaft 1 6 and cup 22, has its'lower end in the lead withrespect to the direc- ';1.;l3101'l of *rotationof the cup-thus, as the cup is l rotated, liquid will be driven upwardly through duct 28 and be -directed toward the inner face i of wall 24 adjacent to the annular edge 30 thereof; The supplying'of liquid to the frictionally m interengaged surfaces of cup'22 and the tool 32, that is .being ground, is accomplished by this simple groupof partsandi so long as the level of liquid20. remains above the lower end of duct 28, an adequate supply of liquid will be forced 15:: against the periphery of cup 22.

The head for holding tool 32 is capable of movement/aboutalvertical axis as well as a substantially horizontal axis, or one that is disposed at right angles to the axis of standard 34.

This standard 34 projects upwardly through an opening in the bottom of reservoir l0, and for simplicity of structure, is a continuation of one of the anchoring bolts 36 that serve to hold motor M in place. The body of this head is in two sections-one designated by the numeral 38 is rotatably mounted on standard 34 and held in a selected position along the length of said standard by set-screw 40. The other section 42 of this body, is held in position by setscrew 44, and therefore, the tool 32 may be held to have the end thereof ground at an angle suitable to the desires of the operator. This setscrew 44 passes through the section 38 above set-screw 40 and is in screw threaded engagement with section 42 for holding the latter part against section 38. Obviously, these set-screws and 44 may be manipulated after tool 32 is introduced into section 42, and if it is necessary or desirable to maintain tool 32 in place through to manual force rather than mechanical, these two set-screws may be left in a loosened condition and such pressure as needed then applied by the hand of the person manipulating the grinder. Cup 22 is removably mounted upon shaft I6 45 and as wear occurs and renewal becomes necessary, such may be accomplished with ease and dispatch.

It will be obvious to one skilled in the art that the head comprising the tool holder, may be set at any desired angle to support tool 32 where it will respond to the touch or grip of the operator as he applies the desired amount of pressure for the grinding action.

The coolant will be automatically supplied to the inter-engaging faces of tool 32 and cup 22,

and all driven substances will be confined within reservoir l and will not, therefore, create dirt or muss of an objectionable nature.

Reservoir I0 should have its annular, continuous side wall angled inwardly as the top is appreached to insure a fulfillment of one of the objects of the invention with respect to cleanliness during the grinding action.

Having thus described the invention, what is claimed as new and desired to be by Let-- ters Patent is:

1. In a tool grinder of the character described, a reservoir for liquid coolant; a grinding elementrotatably mounted in the reservoir-with apcrticn thereof below the level of the liquid; and means bottom and an upwardly directed, diverging side wal-lcircumscribing the element and tool holding for directing the liquid toward one suriace' of theelement as the element is rotated said means comprising a duct formed in th elenient with one end thereof below the surface of the liquid; the

said duct being inclined with respect to the axis oflkmtaticrr ei t e. element: and with thesaid one end-ofrthe duct leading vthe remainingxpcrtion thereof as the: elementis-rotated in one direction;

2.:In a too grin r either-character-described,-

a, reservoir for liquid coolant; agrinding-element rotatably mounted inthe reserVQ t withaporticn thereoftbelow-the-level;ointhe liq d} and mean-s: for directing the liquid toward one-surface off the elementas, the element'nis .r0tated,:=said means; comprising a duct formed in theelemeutwithoue end thereof belowthe; surfacemt thew-liquid, the

said duct being inclined with respect to! theaxis e ofrotation of the element-and; Withwthe said-0ne end'rof the ductileading the-iremaining-uportion" thereof as the elementwis rotatedzinone-direction,

said grinding :elei'n'entfbeing cup-.shapedand shalt?- ing :its annularr edge 1 projected upwardlysrsaid.

head, said structure comprising a duct formed in the element with one end thereof below the surface of therliquid, the said duct being inclined with respect to the axis of rotation of the elementandwith the said one end of the duct leading the remaining portion thereof as the element isarotated in one direction P. shaman;

nsentences; crrnn;

The following references'are-fofirecordimi the file of this patent: 1

UNITED STATES" PATENTS i

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