US1518579A - Valve-grinding tool - Google Patents

Description

Dec. 9

NVENTOR AIEL\\\\\ o. D. HAPGOOD VALVE GRI NDING TOOL Filed Aug. 25, 1922 ATTQBNEY Patented Dec. 9, 1924.

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y n cryp 's OSCAR D. HAPGGQD, 0F MONTAG'IIE, IvIi'LSSACH'USETTS, ASSIGNOB TO GOODELL-PRATT COMPANY, 0F GREEHFIELD, MASSACHUSETTS.

VALVE-GRINDING T0014.

Application filed August 25, 1922.

To (all whom it may concern.

Be it known that l, Osonn D. Hareoon, a citizen of the United States of America, residing Montague, Massachusetts, have invented new and useful Improvements in Valve-Grinding Tools, of which the following is a specili -ation.

This invention relates to improvements in tools, the principal object of the invention being to provide an improved tool especially adapted for valve-grinding, in which the motions of an operating handle can be trans mitted to the valve-engaging blade evenly and with great smoothness, and which tool is simple in construction, economical to manufacture, and very eliicient in its operation.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention consists in the novel features of construction and combination of parts which will be more fully described hereinafter and particularly pointed out in the claims.

In the drawings accompanying and forming part of this specification,

Figure 1 is a partly sectional side elevation of a tool embodying the present invention;

Fig. 2 is a side elevation of said tool taken at right-angles to Fig. 1, the operating lever being shown broken away;

3 is a transverse section on a larger scale, taken on the line 33 of Fig. 1; and

Fig. 4 is a bottom, plan view illustrating the connection of the woiur-engaging-blade carried by the tool.

The same characters of reference designate the same parts in the different figures of the drawings.

Referring to the drawings, 2 designates a tubular shell or housing having secured in its upper end an enlarged head 3, preferably of wood, and in its lower end a flanged bearing sleeve 4, in which is mounted for rotation a shaft 5. llhe shaft has secured to its lower end a tool chuck 6, the upper end of which is flanged in a manner similar to the bearing sleeve 4i and adapted to abut against the lower end of said bearing sleeve, said chuck and bearing sleeve being provided in their abutting faces with alined annular 'rooves adapted to form a raceway for balls 4. The ball-bearing thus provided eliminates any longitudinal pressure or end thrust on the shaft.

Serial No. 584,221.

The shaft 5, at its upper portion, has formed thereon a plurality of spiral threads 5 adapted to engage a similarly threaded opening in a member 8 located within the housing and adapted to reciprocate therein. Elie reciprocatory member has formed on one side thereof an elongated portion 9 which is provided with ratchet teeth that project through an elongated slot 10 formed in the housing.

Mounted on the outside of the housing and removably secured thereby by means of a screw 11, is a strap member or stirrup comprising a cylindrical portion 12 encircling the housing and merging into a pair of radially extending legs or brackets 13 adapted to support a gear 14 in mesh with the ratchet teeth of the reciprocatory member 8, said gear being mounted for rotation on a stud 15 secured in the brackets 13.

' Attached to the gear 14: in any suitable manner is an operating handle 16, by means of which the gear may be rocked on its pivot, thereby to reciprocate the member 8 and cause rotation of the shaft alternately in opposite directions. The relation between the raclr, gear and the spiral threads on the shaft is preferably such tha for each complete movement of the member 8 in one direction the shaft is rotated approximately one and one-half revolutions.

In the structure herein illustrated, a valvegrinding blade 17 of usual construction is removably secured between the jaws of the chuck by means of a long screw 18 that passes entirely through both jaws of the chuck and forms a pivot on which the blade is permitted to rock slightly in the direction of the length of the slot between the jaws, such rocking being desirable in a valvegrinding tool to insure proper engagement with the valve even when the tool holder is ield slightly inclined from its vertical position.

In operation, the blade is placed in on gagement with the valve, preferably with the operating handle or lever 16 at either its uppermost or lowermost position. The op erator, with one hand exerts a certain amount of pressure on the head 3 thereby to hold the valve firmly to its seat, while with the other hand he swings the lever 16 vertically through a very. small are, preferably only suiliciently large to cause the gear 14 to rock in engagement with the first two teeth of the rack. After this rocking motion has been continued long enough to sufficiently grind the valve in that position, the lever is moved a short distance up or down as the case may be, so as to bring the next pair of teeth or the gear and rack into mesh, thus moving the valve to a new position, Whereupon the lever is again given a series of short up and down reciprocations, thus grinding the valve in the new position. This alternate advancement and reciprocation of the lever is continued until the rack has reached the limit of its movement.

From the foregoing it will be seen that I have provided a tool in which the distance through which the valve moves upon its seat will always be the same for every movement of the operating handle through a given are, regardless of the angular position of the lever with respect to the reciprocating member. l have found tl: t by means of this particular combination of elements, the power is transmitted to the valve-grinding blade more evenly and smoothly, so that there is no more tendency for the blade to jump out of place, than With any other combination.

Having thus described my invention, What I claim is:

l. A tool oli'the class described o0mprising a housing, a spiral shatt supported for rotation in said housing and adapted to 0s cilla-te over a plurality of arcs of predeterminable magnitude, a reciproc-able member within the housing engaging said shaft and adapted to rotate same in both its up-anddown movements, a rack carried by said reciprocable member extended outside the housing, a gear adapted to be rocked over a series of given arcs supported exteriorly of said housing in mesh with said rack, and means for so rocking said gear.

2. A tool of the class described comprising a housing, a spiral shaft supported for rotation in said housing and adapted to oscillate over a series of arcs of predetermin able magnitude, a reeiproeable member Within the housing encircling said shaft and adapted to rotate the same in both its up and-down movements, a rack carried by said reciproeable member, a Wheel supported exterlorly of sald housing, teeth on said Wheel meshing with said rack and adapted to be oscillated progressively thereover 1n given numbers at a time, and, a lever secured to said Wheel radially thereof for so oscillating said teeth.

In testimony whereof I have signed .my name to this specification. I

OSCAR I). HAPGO'OD.

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