US2622580A - Dressing tool fixture - Google Patents

Description

W. MUENCH DRESS Dec. 23, 1952 NG TOOL FIXTURE Filed Feb. 25, 1950 5 Sheets-Sheet l NVENTOR. h/aZePMuenc/ Dec. 23, 1952 w. Mul-:NCH

DRESSING TOOL FIXTURE 3 Sheets-Sheet 2 Filed Feb. 23, 1950 um. Am.

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m M w NM. www NN Dec. 23, 1952 Filed Feb. 23, 195o IMINVUMEI Patented Dec. 231952 DRESSING TOOL FIXTURE Walter Muench, Newark, N. J., assigner to Walter Muench, Incorporated, Newark, N. J., a corporation of New Jersey Application February 23, 1950, Serial No. 145,611

Claims.

This invention relates to fixtures with which, by the use of a diamond holding tool. angular slants can be cut on the peripheral sections of a grinding wheel.

Angle-cutting diamond-tool fixtures at present in use have a circular base which is graduated in half degrees and when provided with a vernierplate only settings as close as 5 minutes of a degree can be made.

Besides this limited setting range, there exists also in the old style fixture an impractical arrangement insofar as the diamond holding tool itself is always in a fixed position, it cannot be adjusted horizontally to the left or to the right to bring it into the most favorable position for the job at hand.

Furthermore the diamond itself at present in use in the old style circular-base xtures is a very detrimental factor as the pointed shape of the diamond does not permit high precision work when blending in of angularand contour-surfaces in the periphery of a grinding wheel has to be done.

To overcome the foregoing faults, is the object of the herein presented invention.

For a complete understanding of all the details involved and to present combined a new structure with which to achieve simplified, highprecision results in an eiiicient way, drawings, depicting the preferred form, have been annexed and in these drawings reference characters denote the same part or piece throughout the diiferent views, of which:

Fig. 1 is a front elevation of a radius dresser, on top of which is aligned and fastened, as an attachment, the new angle-cutting fixture.

Fig. 2 is an end elevation of the dresser and attachment, partly in section on the line 2-2 of Figure 1.

Fig. 3 is a partial top plan View of the new angle-cutting fixture shown in Fig. 1.

Fig. 4 is a front elevation of the stationary front cover-plate marked 34, omitting screwholes and dowel-pin holes.

Fig. 5 is a cross-sectional view on the line 5-5 of Fig. 4.

Fig. 6 is a front elevation of the sliding shutterstrip marked 35 omitting screw-holes and dowelpin holes.

Fig. 7 is a cross sectional View on the line 1-1 of Fig. 6.

Fig. '7a is a top plan View of the sliding shutter strip shown in Fig. 6.

Fig. 8 is a front elevation of the dust-cover rail marked 36a; omitting screw holes and doweli pin holes.

Fig. 9 is an end elevation of one dust-cover rail.

Fig. l0 is a front elevation of the stationary left and right cover-plates marked 3l omitting screw-holes and dowel-pin holes.

Fig. 11 is an end elevation of the piece shown in Figure 10.

Fig. 12 is a front elevation of a base-block on which the angle-cutting fixture I can be mounted instead of the radius-dresser.

Fig. 13 is a right end-view of the base block shown in Fig. 12.

Fig. 14 is a front elevation of the slide-block 9.

Fig. 15 is an end elevation of the piece shown in Fig. 14.

Fig. 16 illustrates the position of the slide block 9 when it reaches the right hand end-stop in the stationary front cover plate marked 34.

Referring now to the drawing in which similar reference characters denote corresponding parts throughout the diiferent views, I is in its entirety the new angle-cutting fixture, which in this particular case is used as an attachment mounted on top of a radius-dresser. The xture is aligned to the radius dresser by the two side extensions 2 2 at each end of the angle-cutting xture and is fastened to the radius-dresser with large size screws 3 3.

Before describing in minute detail the functions of the correlated parts of the new anglecutting xture, one should bear in mind that each and every piece is made to super-precision; not only to a thousand (.001) of an inch, but in many cases to tenths of a thousand (.0001) of an inch.

This is especially true with the threaded sleeve 4, which is provided with circular end collars 5-5 through which small tapered pins are inserted to lock the threaded sleeve 4 securely to the shaft 6 and which moves in the end-bearings 1-1.

The stop-collars 8--6 being pinned also to the shaft 6, prevent axial movement of the shaft 6 but permit movement of the internally threaded slide-block 9 to either side by this arrangement. The slide-block 9 has steps cut in, in front and is provided inside with a thread corresponding to the thread on the sleeve 4.

It is an eight pitch thread that is cut and ground into the circumference of the sleeve 4.

A knurled handle knob l0 is provided and can be tightened to the shaft B at either end with the aid of a set screw Il.

A dat 45 on the shaft 6 in Fig. 2 is used when the set-screw Il is tightened up and serves also to seat the set screw squarely on the shaft.

Dial-flange I2, being a part of the knurled knob I0, is graduated with lines all around to the number of 125 equal divisions so that when the knurled knob I9 is turned one complete revolution on an 8 pitch thread of the sleeve 4, the movement (either backward or forward) of the slide block 9 is exactly 1/8 of an inch (.125). The space between each division-line to the next on the dial-flange I2 therefore represents a sidemovement of the slide-block 9 of one-thousandth of an inch (.001). Stationary pointers I3-I3 serve to indicate a zero or other starting position for the graduated dial-ange I2.

Needless to say that, due to the micrcmatic precision involved in this machine, the 8 pitch thread on the sleeve 4 and the corresponding thread inside the slide-block 9, are of the highest precision in the class 4 (close fit) American National coarse-thread series. The movementspace, that is, the space in the unit in which the sleeve 4 revolves and the slide block 9 moves, is completely covered all around to prevent grinding-wheel dust from getting into the thread when in operation.

The top-cover plate I@ is fitted into grooves provided for it in the solid end-bearing columns rl`he top-cover plate I4 carries the dove-tail rail IS with its gib-strip I for take-up of wear. Three pointed screws 32-32-32 permit fine adjustment of the gib-strip.

To the cross-piece I8, which is provided with a dove-tail groove to fit the dove-tail rail I8, the carriage |9 is securely fastened with the screws -20.

The swivel-block 2| is movable to the left or right on the shaft 22 to which it is fastened by two dowel pins 23-23.

Through the curved slot 2d in the upper extension plate 25a of the carriage I9, the swivel-block 2| can be locked in any chosen position by tightening the screw 26 on the washer 27.

A rectangular, close fitting bar 28, held in the swivel-block 2| by the set-screw 29, carries an elongated, edge-cut diamond 20.

In close proximity to the edge of the diamond 30, a fragment of a grinding-wheel 3| is shown. The center-line in this picture is through the center of a 7 in. diameter grinding wheel. As can be observed, the elongated edge of the diamond permits a relative shifting of the centre line up or down and still retains contact of the cutting edge of the diamond with the grinding wheel center-line.

The movement-space is covered in the back by the ribbed plate 33.

The bottom of the angle-cutting fixture is in itself a ready cover and therefore a good protection against grinding wheel dust getting into the sleeve and slide movement-space.

For the front-cover of the movement-space an elaborate arrangement of cover-plates, rails and shutter strips is necessary to permit movement of the slide-block 9 with its attached cross-piece I8, back and forth, without exposing it to infiltration of even the slightest amount of grinding-wheel dust into the moving parts, which are the slide block 9 and the threaded sleeve 4.

The front cover-plate 34 is the one that is first fastened to the fixture-frame before any other.

Shutter-strip 35. is secured to the slide-block 9 with four flat-head screws.

The upper and lower rails 36a and' 36h extend the entire length of the fixture and are of course stationary. These two rails are fastened onto the fixture frame after the plate 34. Front end- 4 plates 3'I-3'I (one at each eno. 1n front of the fixture) give added protection against dirt and dust getting into the moving parts inside. Plates 3'I-3'I are put in place last.

With the overlapping arrangement of the different front-cover pieces, 34, 3B and 31, which are positioned stationary, a dustproof sealing effect is produced in the combined mechanical functions of the details involved, so that the shutter strip 35, which is carried on the slide-block 9, can move freely back and forth without ever failing to function when in operation.

Provision is made to lock the cross-piece I8 with its carriage I9 to the dove-tail rail I6 of the top-cover plate I4 by tightening the screw 43 to the key-strip 44.

The carriage I9 with its extension-plates 25a and Eb incl. the swivel-block 2 I, will, due to its high location at the top of the radius-dresser, cause a top-heavy effect for the rest of the parts involved when in operation.

In order to eliminate all danger of tipping over when held down on a magnetic chuck, the radiusdresser is provided for this reason with special support-brackets 323-38, which are fastened to the stationary base-frame Z with the aid of two precision bolts 39-39 which engage in slot supported strip-nuts 42-42-42-42 The support-brackets 33 can be moved back and forth, sliding in the recessed sections 4-40 of the frame Z.

The brackets 38 are provided with elongated slots for the bolts 39 to reach through and for the brackets to be shifted for this purpose.

It may not be amiss to state here that the angle-cutting fixture I, seen on top in the illustrations of Figs. 1 and 2, is of course removed when a radius is being cut on a grinding wheel 4| by a diamond carried by a cradle on the bracket 38 as shown at the bottom of Figure 1.

To use the angle-cutting fixture I as shown in Figs. 1 and 2 for ordinary degree work, a good protractor is sufficient. However, for the herein presented design great emphasis is hereby asserted to the fact that every single piece employed in the over` all construction of the machine was for the purpose to have everything of such close precision and perfect square alignment that a sine-bar can most readily be used for setting up to make angular cuts on grinding wheels to minutes and seconds of a degree.

A most convenient base which will take care of any top-heaviness existing in the overhanging carriage of the angle-cutting fixture, is shown in Figs. 12 and 13.

In machine-shops and tool-rooms where the radius-dresser shown in Figs. 1 and 2 is already a part of their equipment, then it can be used as a base for the angle-cutting fixture. The radius dresser in this case is then a two in one machine as, with an attachment, it readily serves in the operation of cutting angles on grinding wheels also. In places where the radius-dresser is used all day long for cutting of convex and concave radii in grinding wheels, it would become a question of necessity to have an angle-cutting lxture mounted permanently on a base-block as shown in Figs. 12 and 13.

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

1. A mounting for a tool for .angularl dressing of a grinding wheel comprising a, frame having spaced vertical columns forming journal-bearings, a threaded shaft journaled in said bearings, adjusting means carried by one end of the shaft beyond one column, a slide block carried by the shaft, an enclosure for the shaft and block including a cover plate having a longitudinal track, a cross-piece on the track, a carriage depending from the cross-piece in front of the enclosure, a cutting diamond mounted on the carriage, means connecting the carriage to the slide-block, a fixed front cover plate forming part of the enclosure, upper and lower rails on the front cover plate and forming tracks therewith, a shutter plate carried by the slide block for longitudinal movement in the tracks and an end front cover plate mounted over the ends of said rails near each end thereof and forming front closures behind which the ends of the shutter plate are slidable.

2. A mounting for a tool for angular dressing of a grinding wheel comprising a frame having spaced vertical columns forming journal bearings, a threaded shaft journaled in said bearings, adjusting means carried by one end of the shaft beyond one column, a slide block carried by the shaft, `an enclosure for the shaft and block including a cover plate having a longitudinal track, a cross-piece on the track, a, carriage depending from the cross-piece in front of the enclosure, means connecting the carriage to the slide-block, a front cover plate forming part of the enclosure, a shutter carried by the slide-block, fixed plates on 4the front cover plate around the shutter, a swivel-block adjustably carried by the carriage, a cutter bar on the swivel block and a diamond on the cutter bar and having a vertical knife edge.

3. A mounting for a tool for angular dressing of a grinding wheel comprising a frame having spaced vertical columns forming journal bearings, a threaded shaft journaled in said bearings, adjusting means carried by one end of the shaft beyond one column, a slide block carried by the shaft, an enclosure for the shaft and block including a cover plate having a longitudinal track, a cross-piece on the track, a carriage depending from the cross-piece in front of the enclosure, means connecting the carriage to the slide-block, a front cover plate forming part of the enclosure, a shutter carried by the slide-block, xed plates on the front cover plate around the shutter, a diamond carrier block having trunnions projecting upwardly and downwardly therefrom and engaging in bearings in the carriage for swingably mounting the carrier block about .a vertical axis on said carriage, a diamond supported on the carrier block and presented in a horizontal direction therefrom, said carriage having an arcuate slot therein in concentric relation to the trunnion axis, yand clamp screw means engaging the carrier block and the carriage yand extending through said slot and effective to secure the carrier block in positions of adjustment on the carriage,

4. Apparatus as defined in claim 1 in which the shaft adjusting means comprises a, hand operable knob secured on said one end of the shaft and having an annulus turnable therewith and marked to indicate the degree of turning of the shaft, and an indicator member fixedly mounted on the frame and overlying the marked annulus for cooperating therewith in indicating the degree of turning of the shaft.

5. Apparatus as defined in claim l in which the shaft adjusting means comprises a hand operable knob secured on said one end of the shaft and having an annulus turn-able therewith and marked to indicate the degree of turning of the shaft, and an indicator member iixedly mounted on the frame and overlying the marked annulus for cooperating therewith in indicating the degree of turning of the shaft, and there being included also a rectangular mounting extension extending endwise from each bearing column and grooved at their under surfaces for accurate mounting on the arms of a base block, the shaft turning knob being mountable on either end of the shaft, and each mounting extension being dimensioned and placed to lie close beneath the turning knob when mounted on the particular shaft end and for extending laterally and longitudinally beyond the knob as a protection against inadvertent adjustment cont-act therewith.

WALTER. MUENCH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,451,467 Norton Apr. 10, 1923 1,735,333 Olson Nov. 12, 1929 1,948,866 Norton l Feb. 27, 1934 2,056,148 Flygare Sept. 29, 1936 2,302,921 Spencer Nov. 24, 1942 2,425,453 Bavosi Aug. 12, 1947

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