US2598765A - Surfacing tool - Google Patents

Description

June 3, 1952 F. R. DEWEY SURFACING TOOL Filed April 8, 1946 f/vv/vroe. fsose/c/a R DEwE-g ATToeA/EY.

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Patented June 3, 1952 UNITED STATES ATNT OFFICE 1- i I 2,598,765 l f SURFACING TOOL Frederick R. Dewey, Maywood, Calif.

Application April 8, 1946, Serial No. 660,463 7 3 Claims.

This invention relates to a device for refinishing seats in fluid fiow control valves.

A type of such valve in extensive use comprises a body providing integrally a flat annular seat for cooperating with a closure member urged axially against the seat, and provided with a seat engaging surface formed, for example, of hard fiber.

Such seats often become out, pitted or otherwise damaged as an incident to use of the valve so that the closure member is no longer eiTective'to close the valve tightly, or at least is subject to injury by the damaged seat so as to require frequent renewals.

It is an object of this invention to provide a simple and inexpensive tool for resurfacing such seats; which may be employed while the valve is in place in the line; and which may be employed successfully without requiring especial skill on the part of the user.

It is another object of this invention to provide a tool wherein proper facing of the seat is assured without requiring the removal of an excessive amount of material from the seat.

It is another object of this invention to provide a tool having a novel form of universal connec- .tion for mounting the cutting head.

This invention possesses many other advantages, and has other objects which may be made more clearly apparent from a consideration of one embodiment of the invention. For this purpose there is shown a form in the drawings accompanying and forming part of the present specification. The form will now be described in detail illustrating the general principles of the invention; but it is to be understood that this detailed description is not to be taken in a limiting sense, since the scope of this invention is best defined by the appended claims.

In the drawing:

Figure 1 is an elevation showing a tool embodying the features of the invention, in use;

Fig. 2 is a section on an enlarged scale, taken as indicated by line 2-2 of Fig. 1;

Fig. 3 is a bottom view of the tool seen as looking upwardly in Fig. 2; I

Fig. 4 is a cross section taken as indicated by line 4--4 of Fig. 2;

Fig. 5 is a view similar to Fig. 1 showing a modified form of the invention; and

Fig. 6 is a bottom view of the tool of Fig. 5.

Referring to Figs. 1 to 4 of the drawing, the tool is shown as comprising a head I having ,a cutting face 2 thereon, formed as by a hardened steel insert or file plate 3, resembling a short section of a file, to form a filing or abrading surface. The opposite side edges of the insert, as clearly shown in Fig; 3' are slightly converging. Thus,

the insert 3 may be secured to the head'I by wedging it between the depending lips I-a and I-b of the head I. I

A shank or stem member 4 having a non-circular end portion 4-11. serves to manipulate'the head i. For this purpose, the non-circular portion -a of the shank 4'may be engaged by a-bit brace 6 shown in broken lines in Fig. 1, of a.

wrench (not shown), or even a door knob form of handle as indicated at I may be used;

Means 8 for locating and guiding the shank 4 is provided, comprising a cylindrical member having a bore 9 for rotatably accommodating'the shank l. The guide member 8 is detachably retained in the shank 4 as by having'the'bore-l? stepped as indicated at 9-a, the step S-a being confined against a shoulder II) on the shank 4 by a spring pressed detent II carried by the shank. Sufiicient axial force exerted in opposite directions on the member 8' and the shank 4 will serve to depress the detent I I and allow the guide member 3 to be slipped off the shank. Since member 8 is detachable, it may be replaced by a member of different outside diameter to fit different sizes of valves. 7 An important feature of the device is the universal connection provided at I2 connecting the head I and the shank 4, which in addition to permitting universal motion between the head I and the shank 4, permits ready removal and at tachment of the head from and to the shank.

As'shown in Figs. 2 and 4, the shank Sis provided with a circular recess I3 into which a projection I4 on the head extends. This projection has a cross slot I4-a with anopening I441 of reduced width. A pin I5 fixed in the shank 4 extends diametrally across the recess I3, and carries a spiral spring l6 having an inside diameter somewhat greater than the diameter of the pin I5 and an outside diameter greater than the width of the opening I4-b, but such that the spring may be accommodated in the slot I4-a. From an inspection of Fig. 2, it will be clear that the head I has limited freedom to rock relative to shank 4 in the plane of the paper about the pin I5, and that due to the clearance between the spring I6 and the pin I5, and between the spring I-6 and the slot I i-a, the head I can also rock in a plane perpendicular to the paper. Thus, universal movement between the head and the shank is permitted. Further, by exerting axial force urging the head I away from the shank, the

reduced opening H-b distorts the circular cross section of the spring l6 so that the spring passes through the opening, allowing the head to be separated'fro'm the shank.

Conversely, the head may be attached tothe' seat 2|. The closure member, valve stem, bonnet;

etc., have been removed to permit the seat 2| to be faced, it being understood that these .parts are assembled on the body by threadingthebonnet- (not shown), on the body neck 22. The neck 22 provides a circular opening Which-entendsirorm the seat 2 l. r a The outside diameter of the guide 8 is suc tnatthe guide. fits,v loosely within the neck 22,

seryingftoposition the head [with respect to the seat, 21. The. universal connection l2' insures properen'gagenient of the cutting face 2 with the.

valve seatll; regardless ofany, deviation of the shank 4 from a position truly normal to theseat. In.this.way removal of an excessive amount of' material-'fromthe,seat ,2 l is prevented.

A number. of guides 8 may be provided to coop-' crate. with difierent sizednecks 22.

Inth'e modified ,form of the inventionshown in Figs, 5fand26,,the'head'25 is joined to the shank 4'by a universalconnection as in the previously describedform. Thehead 25comprises a circu lardiscZE with theprojection 2Tfor securing the headtothe shank and anoppositely extending projectionlfljwith a non-circular portion 2841 adjacent. the,disc, and a' threaded outer portion 2.8.4).

A.. circular cutterv 29 providing a cutting face 297-0 is. secured on the non-circular portion 28 a offprojection .28 by a circular nut 30 threaded'on theprojection portion 28-21. This nut 36 has a diametensomewhatlessthan that of the port 3| abontwhichfltheseat 21 extends and serves by engagementwiththewall of the port 3| to maintainithe. head 25in proper; cutting position on the seat 2|.

Inboth formsreciprocating rotary motion may beappliedto the abrading member orcutter3 or 29, by appropriate. operation of thehandle 6 or T. In thisiway the valve seat can be readily round...

The inventor claims;

1, ,In-a. surfacing tool: a head memberhaving acutting face; a shank memberfor operatingthe head; onetof said members vhavinga socket, the other membenhaving-a projectionloosely accom modated, in said socket, said projection having, a

' 4 transverse slot with a reduced opening at the end of the projection, a spiral spring secured to said one member extending across said socket and engaging the slot for securing the head to the shank for relative universal movement, said spring being adapted to be compressed trans- .versely for passage through said reduced opening to permit separation of the head and the shank.

2. In'a surfacing tool-2' a head memben-havin a cutting face; ashank'memberrfor operating said head; one of said members having a projection, the other of said members forming a space in, which said projection is loosely accommodated? said projection having a transverse slot witha reduced-opening at the end of said projection; a, resilient member secured to the said other member-andeXt-ending across said space and engageablewith said slot for securing said head to said shank for relative universal movement, said resilient member beingadapted. to. be .compressed transversely for. passage through said reduced opening.- to permit separation of saidhead. and said shank. 1

3. In asurfacing tool: a head member, havin a cutting face; a shank. member. for, operating said head; and. a. limited. universal coupling for said head'member and said shank member, including means forming. atransverse slot on said headmemberand a reduced opening at the end of. said head. member connnunicatingwithsaid slot, apin carried by said shank member, andaresilient member surrounding said pin.mem'ber, said pm and resilient membenbeing receivable in said slotupon transversecompression .ofLsaid resilient member for. passage ofv said Lpin andresillentmember. through said reduced opening,

FREDERICK R. DEWEY.

REFERENCE-S1 CITED The followingreferences are of record. in the file of this'patent:

UNITEDSTATES PATENTS-

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