US1420915A - Machine for facing or dressing gate valves - Google Patents

Description

F. A. AND B. P. DEXTER IIND I. A. STUARD.

MACHINE f oR FACING 0R DRESSING GAT;y vmvEs. APPLICATION FILED IAN. 9. |920.

1,420.91 5 Patented June 27 1922.

3 SHEETS-SHEET I.

Inventwv M @l Avr/ZZV F.'A. AND B.'P. DEXTLER AND J. A. STUARD. MACHINE FOR FAcING'oR DRESSING GATE vALvEs.`

APPLICATION FILED MN. 9. 1920.

Patented June 27, 1922.

3 SHEETS-SHEET 2.

F. AI AND B. P. DEXTER AND J. A. STUARD.

MACHINE FOR FACING 0R DRESSING GATE VALVES.

. APPLICATION FILED IAN. 9, I92o.

1,420,915 PaIenIed Ime 27., 1922.

3 SHEETS--SHEET 3- Inventon.

UNITED STATES PATENT OFFICE;

FRED A. DEXTERAND BAYARD, P. DEXTER, QRANGELMASSAGHUSET-T,ANJAMES A. sTUAan, 0E HAnnIsBuns,A iEivNsYLvANIf-L; SAID: BAARD P, DEXTER AND MACHINE FORv FACING QR DRESS1NG-GATE VALVES.

Application filed` January 9, 1920, Serial No. 350,409.

To all whom it may concern:

Be it known. thaty FRED, A. DEXTER` and BAYARDV P. DEXTER, citizens of* the United States, residing at. and whose post-office.- address is Orange, in the county ofi Franklin, State of Massachusetts, and JAMES A, STUARD, a citizen of the United States, resid# ing at and whose post-office address is Harrisburg, in the county ofi Dauphin, State of Pennsylvania, have invented-certain new and useful Improvements in Machines. for Facing or Dressing Gate Valves; andi they do hereby declare the following to besa: full, Clear, and exact description of the invention, such as will enable others skilled'in thefart to which it appertains to make andzzusethe same.

The inventionrelates to yimprovements in machines for facingor dressingvgate valves and has for `its objectto provide a. simple and efficient machine ofthe character described that is capable of operating. upon gate valves ofV various sizes and shapes to insure an accurate surfacing ofthe face of the valve which engages: the valve seat.' To this end the invention comprises aitablelike base plate provided withtwo clampingijaiws movable in opposite directions, longitudinally of the table, preferably by meansofY an oppositely threaded screw shaft journalled below the table and engagingf two travelling nuts, slidable in slots inthetable top, said nuts having a pivotal Yconnection with the corresponding clamping jaws, each of which latteris provided witha pair of pivotal dogs, one mounted on each lateral face thereof, each dog having an adjusting screw mounted therein which regulates the elevation of the forward end of the-corresponding dog so thatj the severalV dogs may be adjustedto supportthe valve-andV bring the latter to a level to be engaged by the facing tool, when the valve has been engaged bythe clamping jaws. In order to properly adjust a wedge shape valve for engagement-` bythe facing tool, the machine is provided with a transversely sliding block or wedge which is adjusted under the thin edge of the gate valve so as to bring the faceofv the latter to a proper level. The machine also, includes a vertically. mounted toolengaging spindle capable; of quick adjustment toaccommodate valves and tools of varying-thickness and also of a feeding adjustment by means.: ofwhich thetoolf may be advanced toward the work to regulate the extent of the: surfacing cut, saidfspindle being associated: with. alv discr likeA cutter provided: with adjustable. cutter knives, so that when the lowe'i` end of.L the. spindle engages a central bearing in, the. back` face off the cutter the cuttingblades-or knives rest upon the valve facev and. serveto trim or., cut themetal of thevalve face. tothe desired extent, as the cuttenis intermittently rotated by means of a-,handle andraI friction bandassociated with the. cutter disc. l

In theaccompanying.drawings:

Fig, l: is a front. elevation of the machine showing `v the lower; end ofi the tool,` spindle readyfto engagel the rotary cutter.y

Eig,A 2is: aplan view of the machine with the standard and tool spindle removed.

Fig-5 3zis.:an.end elevation of the machine.

Fig. 4 is a plan view of the rotary-cutter.

lReferring tothe drawings, 1 indicates a tableor-.base plate, on thelopposite endsl of `which are/.mounted standards 2, 2, supportv` ing alcrossipiece 4, the several'elements being securedjtogether by suitable bolts.

Runninglongitudinally of the .upper sur# face of the base plateisa rib 5 provided with two long ggitudinalfI slots,V 5', 5', which slotted r-ibfcunstitutesia guide or track Way for two clamping jaws'.l 6, 6, which are adapted. to loe-moved toward. and'` from each other` forthe. purpose ofY engaging and:l clampingl the laterabedgesrofra,gate. valve or similar ele ment; whichisto be dressed or faced'by the cut-ting7 tool, Concurrent; movement ofthe clamping jawsK yin oppositey directionsy is effected by means of a shaft 9. journalled in bearingsl'l, 12 and-1.13 below the upperface offthe'base plate. l, -said shaft being pro-y videdwith oppositely disposed threaded sec.-k tions, which engagev nuts 7, 7, extending throughthe s1ots5, 5., and connected respectively. tothe?.y clamping jaws 6, y6 by means offpivot, bolts 8,- 8, extending through the clamping jawsand permitting. an independent swiveling action ofl the respective jaws The valve, env aging faces of the clamping jaws,- arey ormed as re-entrant angles which., cooperate with the swiveling actiony off the respectiver jaws to accurately centerthevalve, when thejawsare setA up.

Pivoted at, lto each forwardlateralface ofi eaohof theclamping jaws 6v is a dog l5' specieatioaofLetters-13mm., Patented Juner27, 1922. c

having a screw 17 passing through the same, with its lower end in engagement with the top of the base plate to enable theouter end of the dog to'be raised and lowered to' engage the under face or marginal edge of the valve so that by properly adjusting the four dogs l5 the valve may be accurately levelled, so that its face to be dressed or trimmed will be brought to a true horizontal plane. Then the valve, however, isgofsuch shape as to be supported directly upon the base plate the dogs l5 may be swungfbackward on their pivots out of engaging relation. A

`When`a wedge shape gate valve is to be faced by 'the machine, it is necessary to provide means for accurately supporting the thin edge of the valveand hold the valve in its accurately levelled position between the clamping jaws 6, 6. To effect this object the base plate is provided with a transverse track way20 provided with a longitudinal slot 2l to receive a sliding wedge member 23, tapering toward the center of the machine and having a dependent lug 24 which engages and is guided in thefslot 2l.' The upper face of the track way 20, and the lower face of the wedge 23 are provided with mating ratchet teeth 22, which serve to lock the wedge in its adjustedposition thereby preventing a lateral canting movement of the valve, after the same hasV been clamped by the jaws 6.

Mounted in a central hollow boss 30 in the cross piece 4 and in vertical axial alignment with the center of the base plate l,.is a sleeve 3l havingl an integral collar 32 secured to the upper face of -the boss 30 by studs 33 and locked to the under face of cross piece 4 by a set nut 34. The upper and lower ends of the sleeve 3l are interiorly screw threaded for a short distance to pro; vide a suitable engagement for the threaded tool spindle 4l. rPhe ends of theA sleeve 3l are provided with longitudinal slots 35 and 38 respectively and are also provided with tapered threaded sections 36 and 39, which are engaged by lock nuts 37r and 40 so that whenthe said lock nutsare set up on the threaded ends of ythe sleeve the interior threaded portions of rthe sleeve engage the corresponding screwi threads on theL tool spindle 41. ldhen, however, the lock nuts 37 and 40 are partially backed off the exterior taper ends ofvthe sleeve, the slotted ends of the sleeve expandandr release the tool spindle`4l so that the latter may be moved bodily'longitudinally of the sleeve in a vertical direction, thereby providing for a quick adjustment of the tool spindle with respect tov the tool and the work. When the said nuts 37 and 40 are set up, however, the tool spindle can only be advanced or retracted by rotating the spindleby means of the hand wheel 42, as the threads on the spindle are in engagement with the interior threads of the sleeve aforesaid. This latter operation constitutes the feeding adjustment of the tool spindle.

The", said tool spindle is provided in its lower end with a stud 43 engaging a socket in the spindle end, and having a rounded 'jboss 44 at its lower end adapted to engage a concave recess in the center ofthe back of theicutting tool.

.An eliicient form vof cutting tool for use of the machine as described is illustrated in F ig. 4 and comprises a disc member 50 hav ing ai central opening 5l, which on the rear face is enlarged to form a concave socket to receive the hemispherical boss 44 on the lower end of the tool spindle. Disposed around the outer edge of the disc 5() is a series of clamping studs 52, each adapted to receive a cutting blade 53, said blades being' equilaterally triangular in cross section so that any one of the edges may be presented to the work. These blades are each set at an angle to the radii of the disc 50 and may be adjusted longitudinally in the clamping members 52 to accommodate valves of varying diameters. The cutting disc 50 is adapted to be superposed on the face of the valve to be surfaced or cut, in the position shown in Fig. l,- so that the cutting edge of each of the tools 53 is in engagement with the valve face. The tool spindle is then turned down so that the boss 44 on the lower end thereof engages the recess 5l in the center of the cutter disc and rotary movement is imparted to the cutter disc by means of a friction band 54 which surrounds the peripheral edge of the cutter disc, said band being secured at one end to a block 55, in which is pivoted a lever 56,- 57 to the lower end of which the other end of the band 54 is secured by a pin 58, the band being normally held taut, by means of a spring 59 interposed between the socket member 57 of the lever and abutment- 60 secured in the block 55.

When the parts have been, assembled, with the valve in proper position, and the screw spindle brought into engagement with the cutter. disc, rotary movement of the lever 56 in a clockwise direction tightens up the friction band 54 and imparts rotary movement to the cutterdisc. Movement of ythe lever in an opposite direction releases the friction band 54 from its gripping engagement with the edge of the cutter disc and permits of the band being slid peripherally around the disc without reversing the movement of the disc. Intermittent rotary movement of the lever and friction band 54 in opposite directions, therefore, provides an intermittent rotary movement of the cutter disc in one direction so that a few turns of the disc will be effective in resurfacing the valve face, the extent of the cutting action being regulated by the feeding` movement of the screw 4l under control of the operator.

It will be noted that the range of the movement of the clamping jaws 6 is large and, therefore, that the machine is capable kof receiving and operating upon valves of various sizes, and as each machine is provided with cutter discs of varying size, it will be apparent that a single machine is adapted to operate upon gate valves of widely varying dimensions, and may be employed with equal facility with valves of the ordinary disc type or of the tapered or wedge type.

In operating upon valves of slightly different sizes it is necessary to adjust the cutters 53 longitudinally in their clamping supports, and to facilitate this operation one of the standards 2 is provided with a laterally projecting stud 63 upon which the cutter disc is adapted to be supported, by engaging the central opening 51 in the disc with the stud 63, thereby permitting the disc to be held in any desired position on the stud 63, by means of the lever 56, while the individual cutter members are properly adjusted.

What we claim is:

l. A facing machine for gate valves and the like, comprising a base plate, a pair of oppositely disposed clamping jaws having re-entrant work engaging faces slidably mounted thereon, a feed screw having oppositely disposed threads mounted on said base plate, nuts engaging the threaded sections of said feed screw, and a support having an inclined upper face mounted for sliding adjustment transversely of the base plate.

2. A facing machine for gates valves and the like, comprising a base plate, a pair of clamping jaws slidable longitudinally of the' base plate, means for simultaneously moving the said jaws toward and from each other, including connections permitting a swiveling movement of the jaws, and a valve supporting wedge adjustable transversely of the base plate.'

3. A facing machine for gate valves and the like, comprising a base plate, a pair of jaws slidable longitudinally of the base plate, a pair of work supporting dogs pivoted laterally of each jaw, means to adjust each dog with respect to the base plate, and means for simultaneously moving the jaws toward and from each other.

4. A facing machine for gate valves and the like, ycomprising a base plate, a pair of jaws slidable longitudinally of the base plate, a pair of work supporting dogs pivoted laterally of each jaw, means to adjust each dog with respect to the base plate, and means for simultaneously moving the jaws toward and from Leach other, including connections permitting a swiveling movement of the jaws. k

5. A facing machine for gate valves and the like, comprising a pair of clamping jaws slidable longitudinally of the base plate, means for simultaneously moving said jaws toward and from each other, valve supporting dogs pivoted on each side of the clamping jaws, means for adjusting the height of the ends of the dogs with respect to the base plate, and a support having an inclined upper face mounted for sliding adjustment transversely of the base plate.

6. A facing machine for gate valves and the like, comprising a base plate, a standard thereon, a vertical tool spindle mounted on said standard, a pair of clamping jaws slidable longitudinally of the base plate, means for simultaneously moving said jaws toward and from each other, a wedge support ad justable transversely of the base plate, and a facing tool engaging the lower end of the tool spindle.

.7. A facing machine for gate valves and the like, comprising a hase plate, a standard thereon, a vertical tool spindle mounted on said standard, a pair of clamping jaws slidable longitudinally of the base plate, means forvsimultaneously moving said jaws toward and from each other, valve/supporting dogs pivoted laterally 0f eachk jaw, means for adjusting each dog with respect to the base plate, a wedge support adjustable transversely of the base plate, and a facin tool engaging the lower end of the too spindle.

FRED A. DEXTER. BAYARD P. DEXTER. JAMES A. STUARD. Vitnesses as to Fred A. Dexter and Bayard P. Dexter:

B. C. BANGs, Cona E. BANGs. Witness as to J as. A. Stuard:

GEO. D. HERBERT.

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