US400989A - Pliny j - Google Patents

Description

(No Model.) J. WEIGHT. 7

" VALVE RESEATING TQOL.

No. 400,989. Patented Apr. 9, 18 89..

UNITED STATES PATENT OFFICE.

PLlN-Y J. \YRIGIl'l, OF MINNEAPOLIS, MINNESO'IA, .ls'SIGXOR- OF ONE-HALF TO CLARA E. SAMPSON, OF SA .llli. PLACE.

VALVETRESEATING Too 1..

SPECIFICATION forming part of Letters Patent No. 400,989, dated. April 9, 1889.

Application filed August 24, 1888.

T aZZ whom it may concern: I

I 3e it known that I, PLINY J. \\"RIGH1,?L citizen of the United States, and a resident of the city of lllinneapolis, county of llennepin,

State of Minnesota, have invented a certain new and useful Improvement in Valve-Reseating Tools, of which. the following is a specification, reference being had to the accompanying drawings.

'My invention relates to valve-seat-dressing tools, and is in the nature of an improvement on the construction shown in the patent granted to myself and Samuel Rust of date May 29, 1883, under N 0. 278,478. In my former patentI used a disk-shaped cutter on the end of a revoluble toolshaft and a guide below the tool adapted to fit the opening'in the clearing.

valve-seat for the purpose of centering the cutter. In practice, however, I found that this construction was imperfect. I found that the guide in the valve-seat opening could not be relied on to hold the tool-shaft at right angles to the valve-seat, and therefore a true surface could not be produced. I found that the disk-cutter would not clear itself of the filings. I also found it impracticable to get sufficienhpressure on the tool without throwing it off-its center.

My present invegiftion was designed to over come these defects; and it consists of the construction hereinafterdescribed, and particu larly pointed out in the claims.

In the drawings, like letters referring to like parts, Figure 1 is'a vertical section of the preferred form of my device. Fig. 2 is a similar view of a modification, and Figs, 3 and i 4 are detached views, in side elevation and plan, respectively, of my improved form of cutter.

- the tool-stem.

lower end of said shaft, formed integral there- Serial No. 283,625. (No model.)

with. The lower end of the tool-stem provided with a screw-threaded hole in the line .of its axis.

- ing the cutter to the cutter-head.

The cutterF is ofaspecial construction.- It is in shape like the frustum of an oblong pyramid. The lower surface, f, has a file finish with diagonal grooving, and its inclin ed surfaces f" arealso files with diagonal grooves. This constitutes aflat and a conical file in one.;1i.ere,:lmth of which are selflhe flat file-face adapts the cutter to dress the horizontal 'valve-seats and the conical file-face to the conical valve-seats. I11 virtue of its oblongshape and the diagonal grooving of the file-surfaces it is self-clearing. It does not clog withthe filings.

G is a centering device or valve-stein guide. It consists of a block provided with annular shoulders g at right angles to its axis and reduced sections g',having screw-threaded peripheries, adapting the same to different-sized cap-seats. It is also provided. with a hollow axis adapted to allow the outward passage of hen screwed down into position in the cap-seat, the adjacent shoulder will come to a true bearing with the top thereof. In case the form of pressure device shown in Fig. 2 be used, the bore of the guide block G should be of a size just to fit the valve-stem.

II is a supplementary bushing or guideseat for adapting the device to a greater diversity of sizes of cap-seat openings. Its use is obvious 011 reference to Fig. 1. Y

K and K are pressure-producingdevices. In Fig.1 1 have shown for the purpose a sleeve adapted to closely fit the tool-stein, having a screw-threaded exterior adapted to fit the screw-threaded interior of the guide? block G, the lower end being adapted to bear against the top of the cutter-head with a pressure variable at will by a hand-wheel, In Fig. 2 I dispense with the screw and sub- IOO stitute a link, L, a lever, M, and a sleeve, N, between flanges P on the tool-stein. ver M is fulcrume'd on the sleeve N, and is connected by the link L to the guide-block G.

The upper end of tbe'tool-shaft D is provided with a suitable head, d, for the applicationof' a crank, Q. This crank is prefer ably a paWl-and-ratchet crank, as shown in Fig. 1, the crank being. swiveled to the head of the toolstein and provided with a'springpawl, q, for engaging with the ratchet q,

rigidly attached to the tool-shaft head. The

, purpose of the ratchet-crank is to better adapt the tool to work in corners and close to a wall.

It will be understood that instead of mak" ing the cutter with both the flat and the inclined file-surfaces separate cutters may be used for the two classes of seats, cutters with oblong flat file-surfaces for dressing flat valveseatsand oblong cutters with inclined filesurfaces for the ball-valve seats. The n1aterial point is, that the file-surfaces on the cutter be not continuous.

There "must be clearing-spaces between them, The cutter may take any form having a broken periphery-as, for example, a star or a cross; but a continuous surface will not clear itself;

a The operation of the device is evident. The tool being in position, with the cutter on the valve-seat, pressure is applied thereto through the screw or the lever, and the crank f is revolved. The le- As the shaft is perfectly centered at right angles to the plane of the cutter, the seat is readily brought to a true'bea ring. In this manner a valve may be seated on an old seat as well as to a new one quickly and cheaply, eifecting a large economy.

What I claim, and desire to secure by Letters Patent of the United States, is as follows:

1. Ina valvercseating device, the combination, with a revoluble shaft, of a file connected to the lower end of said shaft at right angles to'its'axis, of a size to cover at anyone time only a part of thesurface to be dressed, whereby the file is rendered self-clearing, substantially as described. l

2. In a valve-reseat-ing device, the combi nation, with a revoluble shaft, of a cutter detachably connected thereto, having a flat filesurface on its under side and inclined file-surfaces on its ends, substantially as described, whereby the tool is adaptable to dressing both flat and conical valve-seats.

3. The combination, with the shaft D, of the cutter F, having flat and inclined file-surfaces f f, the centering-guide G, the bushing II, the screw Kj, and the ratchet-crank Q q q, substantially as described.

PLINY J. WRIGHT,

In presence of- JAS. F. WILLIAMSoN, EMMA F. ELMoRn.

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