US1496728A - Abrading device - Google Patents

Description

J. L. OLSON- ABRADING DEVICE Filed June 6, 1922 gwuenkw J I Olsen Will: 88S;-

Patented June 3, 1924.

UNHTED 1,496,72&

JOHN L. OLSON, OF CHICAGO, ILLINOIS.

ABRADING DEVICE.

Application filed June 6,

To all whom it may concern:

Be it known that I, J OHN L. OLSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful ,Improvements in Abrading Devices, of which the following is a specification.

The present invention appertains to improvements in abrading tools, and is particularly designed for the purpose of re-seating of valve seats of internal combustion engines.

It is well known by automotive engineers and mechanics that the efficiency in performance of an internal combustion engine depends primarily upon correct seating of the valves and to maintain the latter in effective working condition necessitates the repair at intervals of the seats which in use become pitted, scored, carbonized and out of true.

I am well aware that numerous abrading or grinding devices have heretofore been proposed and utilized, and for this purpose, perhaps, the most common or popular instrumentality is the emery grinding stone properly shaped to conform to the valve seat. The difficulty with a device employing this abrading means is that the emery stone soon becomes clogged and very ineffective unless from time to time, or in fact after each operation, the stone is re-surfaced, todo which involves a tedious and protracted process. Even then the chances are the stone will not have the exact angle desired for its working face or a true plane,most vital essentials in a tool of this character,so that it isseldom an accurate and effective re-seating operation is carried out by such employment. Furthermore, in this connection one cannot ignore the factor ofine perience of the average motor machanic who is lacking in skill in the care of his tools.

This has led me to devise a tool of thetype set forth herein characterized by the important fact that the form of the tool will neces- I sarily always remain the same during the life of the tool and wherein the wear is received by and upon a readily replaceable abrading surface.

One of the primary features of my invention is the provision of a tool so constructed as to permitof its use for the purpose de signed upon motors having various sizes of 1922. Serial No. 566,236. I

valve guides, thus increasing its field f utility. M

More specifically my invention comprises novel features of construction as regards the holding andclamping of the abrasive element, by means of which the latter is readily and quickly drawn tightly over the working face of the tool and firmly secured thereto ceeds, the novel features thereof being point-' ed out in the appended claims.

In the drawings:

Figure 1 is an elevation of a device constructed in accordance with this invention.

Figure 2 is an enlarged sectional view of the abrading means of the tool.

Figure 3 is a bottom plan of the abrasive holder.

Figure 4 is an elevation of a bushing member for adapting thetool for use with different sizes of valve guides.

Figure 5 is a detail perspective View of the clamp for the abrasive strip.

Figure 6 is a detail view of the abrasive strip-used with this device.

Corresponding and like parts are referred to in the following description and indicated in all of the viewsof the drawings by like reference characters.

I desire it to be understood that while I have illustrated as exemplary of my invention a hand operated tool, the principles involved in its construction may readily be adapted for mechanical operation without in any wise detracting from the eflicacy of its features and the device may be made in varying sizes to cover the field of the difierent sizes of valves used in motors. Furthermore, I do not desire to be confined to the adaptation of the device for re-seating valves of motors as it may be utilized for other purposes in so far as its details of construction are concerned.

The invention as herein depicted comprises a shaft or shank 1 of suitable sizeand length, having fixed thereto at one end a handle or grip piece 2 properly shaped to permit of rolling it between the hands in the operation of grinding or're seating.

The handle is preferably provided with a circular guard 3 having its peripheral edge turned down with a uniform radius, the disk being secured at the end of the grip piece in any desired manner, as by means of the screws 4 passing through the collar 5 which is pinned to the shank.

The lower end 6 of the shank 1 is in the nature of an extension designed to act as a guide or pilot for the tool when introduced into the guide for the valve stem. To this end the extension is made of a diameter which will easily fit the minimum size guide of motors of general construe tion, so that by bushing, as hereinafter explained, it may serve equally as well for larger guides.

At the end of the shank 1, or at the junc ture of the shank and the extension 6 is located the main feature of my device which includes the abrasive means and its holder. The important novel characteristics will be most clearly apparent by reference to Figure 2 of the drawing, and describing the same,- 7 denotes a supporting disk formed with a sleeve extension 8 tightly fitting upon the part 6 and rigidly pinned thereto. The upper portion of the sleeve extension is exteriorly threaded to receive a clamping nut 9 which acts to clamp the frustoconical holder 10 provided with a central opening 11 sufliciently large to permit this member to drop readily into place upon the sleeve extension and disk 7 The annular face of this member 10 is given the angle of the true face of a valve seat of the type accommodating poppet valves, and at one point is machined a shallow and relatively wide groove 12 to receive the clamping member 13 more particularly shown in Figure 5 of the drawing, a narrow and more shallow groove 14: being provided at each side of the groove 12 for purposes hereinafter mentioned. Secured over this conical face of the member 10 by means of the fastening members or screws 15 is an annular open band 16, conforming in width and shape to the face so as to snugly fit thereupon. It will be noted by reference to Figure 3 that the ends of the band overlap the grooves hereinbefore described and provide a narrow slot or entrance leading to the lateral grooves 14 to thus accommodate the bent ends of a removable abrading cover or strip 1'7, seen best in Figure 6 of the drawing. This strip is preferably emery cloth for the purpose herein contemplated and is cut circular in form so to entirely surround the working face of the exterior of the band 16 and by this means the valve seat is suitably refinished preparatory to lapping in the valves for close and perfect contact.

The manner in which this removable abrasive strip is fastened is important and this will now be described. Prior to doing this, however, it may be added that the clamping member 13 as shown is formed with a stem 13 projecting laterally therefrom through a passage 18 in the member 10 so as to co act with the clamping nut 9 by means of which the clamping member is actuated. The strips 17 are uniformly cut to form a part of the equipment of this tool and the ends thereof are preferably bent or creased as indicated in Figure 6 so as to slide between or rather about the ends of the band 16. The holder member 10 is then slipped into position over the sleeve 8 and against the sustaining disk 7, the beveled peripheral edge of which receives the lower edge of the strip 17 The nut 9 is now screwed downwardly upon the neck 8 until its conical face contacts with the stem 13 in its path, so that further movement of the nut will clamp the bent ends of the strip 17 against the inner faces of the ends of the band 16. This same downward movement of the nut 9 moves the member 10 downwardly clamping it against the disk 7 and this action forces the strip 17 upwardly on the working face of the band causing it to be drawn smoothly taut upon the same simultaneously with the clamping operation referred to. Accidental displacement of the strip is thus precluded during operation of the tool, which operation is clear to those skilled in the art to which the invention relates. In other words, the guide or pilot 6 is inserted into the valve stem guide and the face of the abrasive strip brought into contact with the valve seat to be refinished. Rotation of the tool between the palms of the hands with the exertion of downward pressure will cause the necessary cutting action until the exact alinementand angle of the working face is imparted to the said seat. The guard plate 3 will act to sustain the hands in exerting this downward pressure during operation.

When the abrasive material is removed from the strip by this action, a new one may be easily and quickly slipped into place by reversal of the operation of application above described and l'tZ-ELPPllCzttiOl] of the new strip. However, it should be noted that when the abrasive material of the strip has lost its usefulness, the strip then provides an excellent surface for receiving a valve grinding compound and by this method one piece of emery cloth may serve its purpose for more than one valve seat before it is necessary to discard it for a new one.

It will be noted in Figure 3 that two of the screws 15 are arranged adjacent to the ends of the band 16 to make the same morerigid and in the event of breakage of this part it is easily replaced with another by virtue of the detachable connection.

As hereinbefore premised, the tool is de lll) signed to work with different sizesof valve stem guides, and that this may be accomplished, where the size is larger than the pilot 6, I employ a bushing or sleeve 19 as shown in Figure 4:, the inner diameter of which is just sufficient to snugly fit over the pilot while the outer diameter corresponds to the loose fit in the guide. By the use of an equipment having several sizes of these tubes, the tool will serve a universal purpose. 1 preferably split the tube. as at 20 and bend the split portions inwardly so that the tube will tend to clamp upon the extension 6 and rotate in the guide, thus insuring that the wear will take place on the outer face of the tube.

Further, it is desirable to flange or bevel the upper end of the tube, as at 21, so as to hold itfrom slipping through the guide, and to serve as a means for extracting the tube in the event it becomes detached from the pilot 6.

As hereinbefore premised, the tool may be mechanically operated and to this end the shank is provided with an extra hole, as at 5 to receive the collar pin and hold the handle at a lower point, thereby allOW- ing the end of the shank to extend beyond the handle to permit it to be rotated by mechanical means, such as a brace or electrically driven drill.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. An abrading tool of the class described, comprising a shank, a support secured to said shank, an abrasive holder mounted for axial movement thereon, and means upon said support for removably clamping said holder in position against a lateral member thereof.

2. An abrading tool of the class described, comprising a shank, a tubular flanged support secured thereto, an abrasive holder loosely mounted upon the flange of said support for sustaining said holder upon the shank, and means adjustable upon said support for clamping said holder against the flange to fix it relatively to the shank.

3. An abrading tool of the class described, comprising a shank, a support thereon, an abrasive holder mounted on said support and having a working face, a cover for said face, means for clamping said cover, and means for jointly securing the cover clamping means and the holder in fixed relation upon said support.

l. An abrading tool of the class described, comprising a shank, an abrasive holder mounted thereon for movement longitu dinally of the shank and having an angular working face, a detachable cover for said working face, and adjustable means for clamping said holder in fixed relation to the shank and simultaneously imparting an edgewise movement to the cover to tightenthe same upon the'ho lder during the, clamping action of the latter.

-5. An abrading tool of theclass described comprising a shank, an abrasive holder thereon, a cover strip for the, working face of said holder, a radial clamping means hav ing a member disposed for engagement withthe free end of the strip, and means movable upon the shank to jointly engage a member of said clamping means for the strip and contact with the holder to retain the same in operative position. 6. An abrading tool of the class described comprising a shank, an abrasive holder thereon, a cover strip for the working face of said holder, means movable upon the shank for clamping said holder in fixed relation thereto, and radially movable strip clamping means mounted upon the holder and having a member extending into the path of movement of the holder clamp to impart movement thereto incident to the clamping of the holder.

7. An abrading tool of the class described comprising a shank, an abrasive holder mounted thereon having a conical working face, a cover strip of abrasive'material removably applied to said face, clamping means for securing the free ends of the strip in. position upon the face, a body carried by the shank and having a face to engage an edge of said strip, and holding means adjustable upon the shank to jointly engage a part of the end clamping means and move the holder and cover strip into engagement with said body to impart edgewis'e tightening movement to said strip.

8. An abrading tool of the class described comprising a shank, an abrasive holder thereon having a conical working face, a cover strip removably applied to said face, a flange upon the shank, for sustaining the holder at predetermined position and having an inclined face to engage the edge of said strip, and means for clamping the holder against the sustaining flange and simultaneously effecting an edgewise tightening movement of the strip over the conical face.

9. An abrading tool of the class described comprising a shank, an abrasive holder thereon having a conical Working face and a groove in. the same, a cover member removably positioned over the working face and extending into the groove, a clamping member movable radially in said groove having a face. parallel to said Working face to coact with the cover member, and means for jointly actuating said clamping member to clamp the cover member and fix the holder with relation to the shank.

10. An abrading tool of the class described comprising a shank, an abrasive holder loosely mounted thereon, a support.

on said shank against which said holder is positioned, an abrasive strip removably attached to said holder, a clamping member movable radially on the holden outward from the shank and having a head engageable with the strip, and a nut mounted on said shank in position to coact with the clamping means aforesaid to effect clamping action of the strip and fixing of the holder with relation to the shank.

11. An abrading tool of the class de scribed comprising a shank, an abrasive holder mounted thereon comprising a frusto-conical disk having a groove across the angular face thereof, a band detachably secured to the face to overlap the groove, an abrasive cover member adapted to be detacln ably mounted over the face of said band, a clamping member in the groove of said holder having a stem projecting therefrom, and a clamping nut movable on the shank to engage the projecting stem and effect Lasagna clamping action of the strip and tightening of the strip on the holder incident to such clamping action.

12. A valve re-seating tool of the class described comprising a shank having a guide extension at the end thereof, an abrading member mounted intermediate the length of the shank, and a removable sleeve member adapted to slide upon the extension to cooperate with the extension guide to effect snug fit in valve stem guides,

13. An abrading tool of the class described comprising a shank having at one end thereof manipulating means and at the other end thereof a guide extension, an abrading' member intermediate the guide extension and shank, and a tubular sleeve adapted to slide upon the guide extension provided with means for its frictional retention thereon.

In testimony whereof I aflix my signature JOHN L. OLSUN.

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