US1321855A - singleton - Google Patents

Description

T. F. SINGLETON.

MACHINE FOR FACING VALVE SEATS.

APPLICATION FILED JUNE 17. 1918.

1 ,321,855; Patented Nov. 18, 1919.

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Wham msflSz'ia y dfiiarz 41% v dim/3" T. F. SINGLETON.

MACHINE FOR FACING VALVE SEATS.

APPLICATION FILED JUNE 17. 1918.

1,3? 1,855. Pfitented Nov. 18, 1919.

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2720772 acs'l'd'z'iiyirim THOMAS FOWLER SINGLETON, or EDMONTON, ALBERTA, CANADA.

MACHINE FOR FACING VALVE-SEATS.

Application filed June 17, 1918.

To all whom it may concern:

Be it known that I, THOMAS FOW ER SINGLETON, a subject of the King of Great Britain, and resident of the city of Edmonton, in the Province of Alberta, Dominion of Canada, have invented certain new and useful Improvements in Machines for Facing Valve-Seats, of which the following is a specification.

This invention relates to in'iprovements in machines for facing valves and the objects of the invention are to facilitate mounting the machine on the valve chest without the necessity of removing the valve seat and so be able to face the seat when in position, to permit of the machine being adjusted to suit valves of different diameters thus giving to the machine a large range within which it can be advantageously employed and to permit of the cutting bar of the machine being readily brought into alinement with the valve seat and so held during the operation of facing the valve seat without any possibility ofthe machine becoming displaced.

Further'objects are to control the feed of the cutting bar so that the desired pressure between the cutting member and the face of the valve will be maintained and chattering thus eliminated, while at the same time there is no possibility of the tool dipping into the face of the valvese'at and roughing the same, and generally to adapt the several parts of the machine to better perform the functions required of them.

With the above and other objects in view, the invention consists essentially of the improved construction particularly described and set forth in the following specification and accompanying drawings forming part of the same.

In the drawings: j t Figure 1 is a front elevation of the improved machine. a

F 2 isa longitudinal "section of the up per portion of the machine showing the mo 'ter bar in elevation.

Fig. 3is a plan view of the upper part of the l nachi'ne with the cutter bar removed.

ig. 4 is a front elevation of an alternative form of j aw-adjusting mechanism whereby the machine is centered on externally threaded valve eh'ests. l I

Fig. 5 is a plan view of the face plate showing the jaws slidably mounted therein. Like characters of ieferenee refer to like iiithe "several agar-es.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Serial No. 240,360.

Referring to the drawings, A represents the improved machine comprising a face plate 10 provided with an integral stem 11 threaded at the upper end and having a central bore 12 turned to a working fit for the cutter bar 13, the face plate being provided with a plurality of radially extending slots 14, the object of which will be made clear hereafter.

The cutter bar 13 is provided with a lower enlarged end 15 which forms the cutting member, the opposite end 16 being squared to engage with the hand wheel 17 by means of which rotary motion is manually imparted to the cutting bar.

This bar isprovided intermediate of its length with a plurality of annular recesses 18 designed to be engaged by a pair of laterally displaceable keys 19 slidably mounted on top of the adjusting nut 20 which makes threaded engagement with the upper end of n the stem 11.

The keys. 19 are held in place by a cover plate 21 which is positioned by means of screws 22 or the like, and when the keys are pressed into engagement with one of the annular recesses 18 they prevent longitudinal moving of the cutter bar 13 taking place, but permit of rotary motion being freely transmitted to the said cutter bar.

The slots 14 of the face plate 10 slidably support a plurality of jaws 23 provided at the lower ends with downwardly extending tongues 24:, the said jaws being recessed in termediate of their length 'as shown at 25 and provided at the upper end with an inner tapered wall or edge 26 adapted to be engaged by the inverted conical member 27 whereby the jaws are pressed outwardly to permit of the tongues 24 being forced into engagement and held frictionally against the inner periphery of a valve chest.

.The conical member 27 is slidablv mounted on the stem 11 and above this conical member a lock nut 28 is threaded on the said stem so that by rotating the lock nut the conical member will be forced downwardly to spread the jaws 23.

The face plate 10 is also provided with a pair of peripheral projecting me1nbcrs29 with which the free ends of the chains b0 engage, the other ends of the chains being connected to the ends of the tension plate 31 which is provided with a tension screw smearing threaded engagement therewith.

Oii'the upper end of the tension screw a 33 should be kept in position and not be rotated and to this end I provide a pair of guides 35 which engage with the said crab andpass through the tension plate 31 on diametrically opposite sides of the said tension screw.

In that form of the invention illustrated in Fig. 1, the inverted conical member 27 is dispensed with and a hood 2''? having an inner conical. wall is substituted therefor. This hood is fed downwardly under the action of the lock nut 28 which is the facsimile 'of that described with reference to Fig. 2 and the jaws 23 which are slidably mounted in the slots 11 of the face plate 10 are provided at the upperend with beveled outer walls 26 which engage with the conical wall of'the hood and so force the said jaws inwardly toward the center of the-face plate 10.

When this machine is in use and say for instance that the. valve seat of an ordinary water tap or steam valve is being faced, one of the chains 30 is disengaged from the hook 29 and the cutting member 15 of the cutter bar 13 is introduced into the valve casing,

the cover of which has been removed. If the valve casing has been threaded internally it will be naturally true to the valve seat located therein and in this case that form of the invention illustrated in Fig. is used.

The downwardly extending tongues 24 of the jaws 23 are located within the bore of the valve and the lock nut 28 is adjusted until the conical member 27 presses the jaws 23 radially outwardly until the said tongues frictionally engage with the inner periphery of the bore and so center the upper portion of the machine relatively to the valve or water tap..

In this position the cutting bar 13 is di rectly in alinement with the longitudinal axis of the valve seat. The chain 30 which has been prevously disengaged from the hook 29'is now engaged therewith and the tension screw 32 adjusted until the crab 33 engages with the lower curvilinear wall of the valve casing thereby holding the machine in the desired position.

The cutter bar 13 is now adjusted until the cutting member 15 just rests on the valve seat to be faced whereupon the keys 19 are moved inwardly to engage with one of the annular recesses 18 which is in alinement therewith and the screws 22 of the plate 21 are tightened holding the keys in position.

Rotary motion may now be imparted to the cutting bar 13 by means of the hand wheel 17 and to move the cutting member 1.3 against the valve face it is only necessary to adjust the nut 20 which will feed the cutting bar longitudinally.

It will thus be seen that the pressure cxerted on the face of the valve will be such that while an eiiicient scraping and facing of the same can be made by the cutting member 15 chattering will not take place nor will the cuttin member dig into the said valve seat.

In some valves however, it is found that the cover may be threaded externally so that the outer periphery of the bore is then true with the valve seat and when such is the case that form of the invention shown in Fig. l-

' relatively to the valve.

The tension plate and chains 30 are now arranged with] the free ends of the chains engaging the hooks 29 of the face )late 10 and the tension screw 32 is tightened to permit of the crab 33 engaging the outer wall of the valve casing and so securethe machine in position.

The operation of feeding the cutting member 15 against the valve seat and positioning the cutting bar 13 to control the longitudinal motion, is the same as has been described above so that it is not thought necessary to further enlarge upon the same. From the above description, it will be seen that I have invented a portable machine for facing valve seats which is capable of being operated on a great range of sizes and types of valves, the jaws 23 being so constructed that they can be easily adjusted while the cutting bar 13 can be moved longitudinally so that one of the series of annular recesses 18 is engaged by the keys 19 and whereby the depth to which the cutting bar 18 operates is given a great range while the adjustment of the keys 19 and the nut 20 whereby the feed of the cutting member 15 is controlled is readily accomplished with a minimum of labor and time.

As many changes could be made in the above construction and many apparently widely different embodiments-of my invention within the scope of the claims, constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying drawings and specification shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is:

1. A portable valve facing machine, comprising a face plate, a rotatable cutter bar provided with a plurality of annular recesses therein, a cutting member at one end of the said bar, key means engaging with the annular recesses, designed to prevent longitudinal motion of the cutter bar, and clamping means coacting with the face plate.

2. A valve facing machine comprising a face plate, a cutting bar passing through the face plate having a cutting member 011 the end thereof, means for rotating the cutting bar, a tensioning plate, flexible members coacting with the tensioning plate designed to be adjustably secured to. the face plate and a tension screw coacting with the said plate.

3. A valve facing machine comprising a face plate, a cutting bar extending through the said face plate, a cutting member on one end of the bar, means for rotating the bar, a

tension plate, flexible members connected to the tension plate adapted to be adjustably secured to the face plate, a tension screw passing through the tension plate, and a crab secured to one end of the tension screw.

4. A valve facing machine comprising a face plate, a cutting bar extending through the face plate, a cutting member at the end of the said bar, means for rotating the cutting bar, a tension plate, flexible means connecting the tension plate to the face plate, an adjustably supported crab and guide means carried by the crab coacting with the tension plate.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

THOMAS FOWLER SI NGLETON.

lVitnesses WILLIAM J. Yno, ANNA MGNABB.

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