US1911847A - Valve cutter - Google Patents

Description

W. REILLY VALVE] CUTTER May 30, 1933.

Filed Feb. 17, 1931 INVENTOR WILL/AM REILLY Patented May 30, 1933 UNHTED STATES \VILLIAM REILLY, OF VANCOUVER, BRIT'ISTI COLUMBIA, CANADA VALVE CUTTER Application filed February 17, 1981. jSerial No. 516,334.

My invention relates to improvements in valve cutters, which are particularly adapted for use in resurfacing water faucets and the like.

The objects of the invention are to provide means whereby the tool may be adjusted to fit seats of varying diameters; to provide means for centering the cutting head of the tool with the seat and to provide means for supporting and centering the tool within the stem bore of the valve hood irrespective of its diameter.

The invention consists essentially of a longitudinally divided stem having a cutting head capable of expansion in response to the spreading of the stem elements, as will be more fully described in the following specification and shown in the accompanying draw- 7 ing, in which Fig. 1 is a sectional view of the invention in position within a valve.

Fig. 2 is a sectional view showing adjusting wedge in side elevation.

Fig. 3 is a general view.

Fig. 4 is a sectional View taken on the line t4 of Figure 1.

Fig. 5 is a plan view as seen from below.

Fig. 6 is a perspective view of the adjusting wedge.

In the drawing like characters of reference indicatecorresponding parts in each figure.

The numeral 1 indicates generally a valve body having a dividingv wall 2 includin a valve seat 3, and a hood 4 provided wit a central bore 5 in which the valve stem is normally j ournalled and which serves also as a bearing for the valve grinding tool.

The numeral 6 indicates a stem having a squared shank 7 to fit a brace or other suitable turning device. The stem 6 is divided for the major portion of its length into two legs 8 each of which support at their lower ends a complimentary part 9 of a cutting head 10 and from the base of these parts substantially semi-circular tapering guides 11 project, which serve to centre the cutting head 10 with the seat 3. The cutting head is provided with teeth 12 upon its lower face for seat facing and vertically disposed teeth 13 upon its periphery for reaming purposes.

The legs 8 are preferably provided with a zone of weakness 14: intermediate their length where such flexure may take place as to permit the two portions of the cutting head to be spread apart and secured in parallel relation. Below the zone 14 on each of the legs 8 a flat surface 15" is provided, which surfaces converge towards each other in an upward direction. Extending through the legs is a longitudinal slot 16 which is adapted to receive a bolt 17, and hold in adjusted posi-- tion a wedge generally indicatedby the, numera'l 18. The wedge 18 is provided'with spaced flanges 19 which taper upwards,-and a web 20, the opposing faces of which are parallel. 1 The upper extremity of the Wedge is reduced in width as at 21 and isprovided with-an orifice 22 in which the bolt 17. is freely fitted. V The innerfaces of the legs 8 are provided withspaced tapering recesses 23 separated by longitudinal ribs 24, the former serving as channels for the reception of the flanges 19 and the latter serving as guides on which the wedge is retained about the longitudinal axis of the tool. Freely suspended from a pin 25 and disposed between the legs 8 is an inverted U-shaped spring member 26 having depending legs 27, which normally project their outer faces beyond the periphery of the stem 6 and which are capable of being compressed to conform to the diameter of the bore of the valve hood 4.

Having thus described the several parts of my invention I will now briefly explain its use. 1

The valve to be ground is fitted with the tool which is adjusted by raising or lowering the wedge 18 until the outer surfaces of the guides 11 are spread to the diameter of the valve seat aperture. When the wedge is so adjusted, it is secured in place by tightening up the bolt 17 against the converging surfaces 15. It will be noticed that the convergence of the plane of these surfaces would normally tend through the bolt 17 to draw the wedge upwardly and that the pressure upon the wedge would have an equal tendency to drive said wedge downward with the result that no wedge movement can occur even though the tightening of the bolt is not great. The zone of weakness 14 of the legs 8 permits them to be so sprung on being spread apart that an intimate contact is effected between them and the tapering faces of the wedge, and that the complementary parts 9 of the cutting head 10 will remain parallel to each other, thus providing a cutting face to the tool which lies wholly in a single plane.

Subsequent to the adjusting of the tool and its insertion into the valve body 1, the hood t is placed over the stem 6 and screwed into place upon the valve body, the U-shaped spring member 26 bearing equally on opposite sides of the bore 5 of the hood and thus supporting the stem that it may be held in alignment with the valve seat when being turned by a suitable turning instrument.

What I claim as my invention is:

A valve seat cutting tool comprising a stem devided longitudinally adjacent its lower. end to form a pair of legs, a cutting element at thebase of each leg, a tapered wedge disposed between the legs to spread them apart to adjust the diameter of out of the tool and a bolt extending through the legs and the wedge for securing the legs and wedge in adjusted position, and .a projection integral with and extending below each cutting element adapted to serve jointly as an adjustable centre for the tool and to engage the inner periphery of the valve seat. I

Dated at Vancouver, B. C., this 11th day of February, 1931.

WILLIAM REILLY. Y

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