US2591434A - Dressing device for grinding wheels - Google Patents

Description

April 1, 1952 M. HRANKQWSKI DRESSING DEVICE FOR GRINDING WHEELS Filed July 14, 1948 2 SHEETS-SI-1EET l JNVENTOR.

L m M. M

HRANKOWSKI M. H RAN KOWSKI DRESSING DEVICE FOR GRINDING WHEELS April 1, 1952 Filed July 14, 1948 2 SHEETS-SHEET 2 Patented Apr. 1 1952 UNITED STATES PATENT OFFICE DRESSING DEVICE FOR GRINDING WHEELS Michael Hrankowski, Plainfield, N. J.

Application July 14, 1948, Serial No. 38,610

1 Claim. 1

This invention relates to new and useful improvements in devices for dressing grinding wheels.

The cardinal object of the invention is to provide an improved such device, for dressing or truing the grinding face of a grinding wheel, and which is characterized by marked compactness throughout, yet nevertheless with exceptionally rugged parts, and these last strikingly few in number.

Another object is to provide a device as above, and with only a very few of its few parts relatively movable in using the device, and, further, with these parts so assembled and related that by their very arrangement and special shapings not only are all the parts kept few in number but they are exceedingly easy and inexpensive to fabricate and assemble, and, besides, the advantage is present that should dust and grit be accumulated to an extent possible to become an agent to disturb easy and expeditious manual operation of the device such an accumulation is readily removed without take-down of the assembly.

The above and other objects, and the various other novel features and advantages of the device will be pointed out or become apparent hereinafter.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claim in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a familiar bench and floor type of grinding machine, including the conventional flat guide plate on which the new device may, for instance, be expeditiously and efliciently temporarily mounted for using the device to quickly dress the grinding wheel of said machine.

Fig. 2 is a top perspective view of the new device, detached from said plate or other selected support.

Fig. 3 is a top plan view of said device, partially broken away and partially in section.

Fig. 4 is an end elevation thereof, looking toward the right in Fig. 3.

Fig. 5 is a detail view, being a fragmentary vertical section on the line 5-5 of Fig. 3.

Fig. 6 is a perspective view of that part of the device which will below be called the barrel member, and showing also an integral auxiliary structure incorporatmg a pair ofslides said member being viewed in substantially the direction of the arrow 6 of Fig. 2.

The device for dressing grinding wheels, according to the present invention, includes a base plate I0 fiat all over its bottom and having a main portion of elongate rectangular outline all around except at one corner area where the said plate has a reduced extension H the root section l2 of which is curvilinearly extended away from said corner area.

Along the end of said main portion of the plate I 0 opposite to the end thereof from which said extension ll projects, and at the top of the plate, is an integral rib [4. At the inner side of this rib is a gib l5, undercut along its side remote from the rib. At the opposite end of the main portion of the plate I0 is another gib l6, this undercut along its side facing the gib [5.

The gib I6 is fixed On top of the plate I0, as by riveting or in any other suitable way, with the vertical Wall of its undercut portion and its vertical wall thereabove in parallelism with the inner side of the rib I4.

The gib I5, having its side adjacent to the rib l4 and also both of its vertical wall portions facing the gib 16 in parallelism with the vertical wall of the said undercut portion of the gib I6, is adjustable toward and away from the gib l6, by means of a pair of set-screws H and I8 carried by the rib l4, and this adjustment is lockingly secured by means of a pair of screws "l9 and 20 downwardly entered in countersunk slots 2| and 22 through the gib l5, the lower ends of the shanks of these screws engaging drilled and tapped recesses in the top of the plate Ill.

The undercut portions of the gibs l5 and I6 constitute a fixed guideway means relative to a pair of slides 23 and 24, each having a laterally extended bottom flange 23 or 24*, for accommodation in said undercut portion of the adjacent gib I5 or [6. These slides 23 and 24 are integral with a cylindrical pocket bearing sleeve or barrel 25; this barrel near opposite ends thereof overlying the slides 23 and 24 near the ends of the latter adjacent to the rear side 26 of the main plate I0. At said ends of the slides 23 and 24, and just beyond the rear side of the barrel 25, the said slides are bridged by a bar-like connector 21 integral with the slides (see Fig. 6) and also integral with the somewhat flattened bottom 28 of the barrel (see Figs. 4 and 5).

The barrel 25 is bored from end to end and such bore is surface finished to perfect cylindricity; and slidable in said bore is a cylindrical member 29 also finished laterally thereof to per- One end of the member 29 is cut away at top i and bottom to provide a reduced integral ear 32,

for pivotal connection, as at 33', with one end of a short link 34. The other end of said link is pivotally connected, as at 35, to an end of a lever 36 fulcrumed as at 31 to the outer end of the extension I! from the main plate H1. The ropposite end of said. lever carries a handle 38. 7

By means of said handle, the member 29 may be shifted longitudinally to one limit of its movement relative to the barrel 25, and then to the other limit of its movement relative to said barrel. The amplitude of this reciprocatory movement of the member 29 is determined by the length of a slot 39 along the rear side of the barrel 25. This slot overlies the bar-like connector 21, has rounded ends, and is about as long as said connector. 7

Through said slot 39 there is projected th holder 49 for the grinding wheel dressing instrumentality.

Said holder is here shown as post-like and having at its outer end a bifurcation as at 4| for rotatively mounting, on a shaft element 42 integral with a set-screw 43, a group 44 of stone dressing instrumentalities of a familiar kind incorporating a plurality of alternatively arranged plane and toothed disks.

The inner end portion of the holder 40, where the latter projects through the slot 39, is cylindrical, and this formation is continued as indicated at 45 to the inner end of said holder; this cylindrical portion-of the holder for being inserted into a matchingly shaped recess 46 extended into the member 29 transversely thereof (see Fig. 5)

Said recess is about midway along the length of the member 29, and, now again referring to the already mentioned set-screw 3|, this is in a drilled and tapped hole vertically above the recess 45. Thus, with the aperture 39 through the top of the barrel 25 located at about midway along the length of said barrel, which aperture it will be noted is quite a bit larger than the head of said set-screw, the set-screw 3| is made readily accessible by way of said aperture when the member 29 is arranged to bring the central portion of its length substantially midway between the opposite ends of the barrel 25.

By way of the set-screw 3|, the holder 40 is locked fast to the member 29, for rearward projection therefrom and through the slot 39 as already pointed out. The slot 39 is so proportioned, and so placed on the barrel 25, relative .to the lengthof said barrel and to the length of the member 29, that with the latter at either of its extreme limits of reciprocation the entirety of the bore through the barrel 25 is occupied by some portion of the member 29.

Moreover, the provision on the barrel 25 of the slot 39 and also the aperture 30, makes it almost Rigidly upstanding from the main plate I9 is a post 41 having therethrough a drilled and tapped hole near its upper end for taking a feedscrew 49 shown as having a wing-type fingerpiece 49 at its outer end. The inner end of this screw bears against the outer side of the barrel 25, with the post so located that such bearing is at a point along the barrel about midway between its ends.

For normally urging the barrel 25 to a position suchthat the dressing instrumentality 44 is retracted, a retractile spring 50 is connected at one end to a hook 5| secured to the post 41 and at its other end to a hook 52 carried by the connector 21.

The main plate [9 is provided with a pair of slots 53 and 54, whereby bolts or screws may be employed to secure the device on a suitable support, as, for example, on the flat guide, plate 55 of the grinding machine shown in Fig. 1; this plate having two tapped holes 56 and 51, in placements agreeing with the locations .of the slots 53 and 54 on the said plate I9.

With the device thus mounted, say on the guide plate 55, the dressing instrumentality 44 of the device will be workingly directed toward the grinding wheel 58. By turning of the feedscrew '48, advancement of the barrel 25, and

with it said instrumentality 44, is effected, for proper engagement of said instrumentality with the wheel 58; and then, by swinging the handle 38, said instrumentality 44 may be caused to traverse laterally the periphery of the wheel 58. Back and forth swinging of said handle causes the instrumentality 44 to sweep back and forth across the periphery of the wheel while it is in rotation. As the wheel dressing continues, the feed-screw 48 is from time to time, as and if required, further turned. When the wheel dressing is completed, turning of the feed-screw in the opposite direction frees the spring 50 to retract the instrumentality 44 to cause disengagement thereof from the wheel.

The new device, eliiciently and easily manually operative as above, is exceptionally compact, and while rugged throughout of very light weight. The only accumulations of dust and grit ever possibly to become a little troublesome are under the gibs l5 and [6, in the aperture 39- and in the slot 39. By arranging the plate [9 substantially vertical with its side 26 lowermost and tapping the device sharply against a fixed anvil or the like, any accumulations of dust and grit under said gibs and in the said slot are ejected. By turning the device upside down, so that the aperture 39 is lowermost, a similar tapping treatment of the device results in any dust and grit accumulation in said aperture being ejected.

While I have illustrated and described the preferred embodiment of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claim.

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

In a device for dressing a grinding wheel having an elongated base to be mounted adjacent the grinding wheel with its length extended at right angles to the grinding wheel to be dressed and having a slide mounted thereon for movement toward and away from the wheel, an elongated barrel fixedly mounted on the slide parallel to the elongation of the base and formed with an elongated slot in its side, a cylindrical member slidably extended through said barrel and formed intermediate of its ends with a recess aligned with said slot, means connected between the base and said cylindrical member for manually sliding said cylindrical member axially in one direction and then in the other direction relative to said barrel, a dressing tool having an inner end portion passed slidably through said slot and into said recess so that dressing tool will move with said cylindrical member, a set screw threaded through said cylindrical member and abutting the inner end portion of said dressing tool retaining it in position on said cylindrical member, a, post extended from the base on the side of said cylindrical member opposite the side from which said dressing tool extends, an adjustment screw threaded through said post and abutting said cylindrical member to be turned relative to said post for moving the slide and said cylindrical member away from the post, and a contraction spring connected between said post and said slide in a direction in which said cylindrical member is abutted against said adjustment screw.

MICHAEL HRANKOWSKI.

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

UNITED STATES PATENTS Number Name Date 512,653 Kling Jan. 9, 1894 637,297 Strong Nov. 21, 1899 693,399 Jenkins Feb. 18, 1902 760,926 Schroeder May 24,1904 981,810 Sterling Jan. 17, 1911 1,634,350 Briggs July 5, 1927 1,662,192 King Mar. 13, 1928 1,t94,705 Hall Dec. 11, 1928 2,452,398 Smith Oct, 26, 1948 y

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