US3405702A - Dressing grinding wheels and the like - Google Patents

Description

Oct. 15, 1968 w. E. PASOWICZ DRESSING GRINDING WHEELS AND THE LIKE Filed Dec. 13, 1966 Inventor Fig.2;

Wolf rE.Posovticz,

United States Patent 3,405,702 DRESSING GRINDING WHEELS AND THE LIKE Walter E. Pasowicz, 2342 l Kenneth Ave., Chicago, Ill. 60639 Filed Dec. 13, 1966, Ser. No. 601,496 6 Claims. (Cl. 125-11) ABSTRACT OF THE DISCLOSURE A tool intended particularly for the use of machinists and others engaged in fine and accurate grinding wheel operations; enabling the user of such tool to produce desired engagement of the dressing tool with the work body, from numerous angles of the tool with respect to such work body. The tool is provided with several end connected links for support of a tool carrying element, by which such tool carrying element may be brought to a wide range of positions with respect to the work body; provision being made for locking the parts in adjusted position.

This application relates to improvements in dressing grinding wheels, and the like. The structures herein disclosed are of the general form and type of those disclosed in my copending application for Letters Patent of the United States on improvements in dressing grinding wheels, and the like, Ser. No. 395,427, filed Sept. 10, 1964, nOW Patent No. 3,301,247, and the presently disclosed structures comprise improve-ments or variations on the structures disclosed in that earlier application. One such improvement comprises the provision of means whereby the carrier element which supports the dressing unit, may be attached to the link which supports such carrier element, in more than one direction or relation of such support by such link, to thereby render the structure more versatile, in the sense that the dressing unit may thereby be presented to the wheel being dressed from either a vertical or upstanding position, as shown in said earlier application, or from a sidewise extending position, thus facilitating the dressing of the wheels or other bodies from either an tip-reaching position, or from a sidewise approach position; the arrangement herein disclosed being one which also makes it possible to vary the angle of contact of the grinding tool with the work body through a wide range of adjustments, including an adjustment under which the grinding tool projects directly towards the plane of rotation of the wheel being dressed (or other work body), or projects in direction at a wide range of variations of the angle with respect to the plane in which the wheel being dressed rotates. Reference to such earlier disclosed structure will show that, although the dressing element therein supported may be rocked through a wide range of angles of projection towards the work body, such rockings are produced about a horizontal axis, and with upward projection of the cutting tool at a desired angle to its engagement with the surface of the work body. The structures herein disclosed are constituted for operation according to such just explained conditions; but additionally, the presently disclosed structures are such that the rocking adjustments of the cutting tool may also, alternatively, be produced about a vertically extending axis, lying in a vertical plane, instead of lying in a horizontal plane. Thus the versatility of the operations which may be performed by the presently improved structures is substantially increased.

A further feature herein disclosed, relates to improvements whereby the dressing unit may be extended out horizontally from the plane which includes the supporting links so that the cutting or dressing operations may be performed on surfaces'not readily accessible when such a lateral extension is not produced. The arrangement is such that such lateral projection may be provided in either direction from the plane of the supporting links, by a simple reversing operation during attachment of the parts.

A further improvement resides in the provision of improved means to adjust the angle of the first or primary link, with respect to the horizontal base, thereby adjusting the elevation of the carrier element above the plane of support. This improvement simplifies the structures, and otherwise improves them as will hereinafter appear.

A further feature relates to the provision of means whereby the several links may be very securely locked in any adjusted position or angle with respect to each other. Thereby danger of slippage during a dressing or grinding operation is materially reduced, it being noted that such a slippage might cause material damage either to the work body or to the dressing unit, due to sudden and serious change in the engagement of the tool with the work body.

Other objects and uses of the invention will appear from a detailed description of the same, which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawing:

FIGURE 1 shows a side elevation of a structure embodying the improvements of the present application, the carrier element being shown in its attachment to the central link or arm, in manner to support the cutting tool facing upwardly;

FIGURE 2 shows a horizontal view of the lower portion of the structure shown in FIGURE 1, only the lower link being shown;

FIGURE 3 shows a fragmentary side view of a portion of the structure, the carrier element being rotated on an axis extending lengthwise of such unit, through an angle of ninety degrees, to cause the cutting tool to ex tend laterally instead of upwardly, as shown in the prior showing of FIGURE 1, it being noted that in FIGURE 3 such extension of the cutting tool is towards the observer;

FIGURE 4 shows another fragmentary side view of another modification, wherein there is provided a lateral extension element connected to the carrier, to receive and hold the cutting tool in laterally displaced position for more convenient conduct of various operations;

FIGURE 5 shows a cross-sectional view taken on the line 55 of FIGURE 4, looking in the direction of the arrows; and

FIGURE 6 shows a .face view of an insert element constituted for engagement with a companion element, both elements being set into the proximate end portions of two pivotally connected links, to lock such links securely against angular displacement with respect to each other; such insert elements being shown by dotted lines in FIGURE 2.

Referring to the drawing, the unit includes the base block 10, to be seated on a smooth planar surface. Such block may be formed of magnetizable material, for magnetic holding to the surface on which it is seated. The block 11 is seated in a lateral recess of such block 10, and firmly secured thereto, as by the screws 12. The primary arm or link 13 is pivotally connected to such block 11, as by the screw 14. In order to retain the link 13 securely against angular shift from its intended adjustment I have provided the following structures:

The plate 15, having the arcuate lateral extension 16, is seated against the rear face of the block 11, with such lateral projection extending leftwardly as shown. Such lateral extension is provided with a series of openings 17, spaced apart at comparatively small spacings, such as ten degrees; and the arm 13 is provided with a single opening 18, located at the same radius from the pivotal connection, as the openings 17. Accordingly a pin 19 may be set through any one of the openings 17 which has been registered with such single opening 18, to lock the arm 13 in fixed angular position with respect to the plate 15. Such plate 15 is rotatably mounted on the pivotal connection 14, so that it may be rocked through a smfll angle, to carry the projection 16 up or down a correspondingly small amount, carrying with it the arm 13 which has been pinned to such projection 16. Such vernier angular adjustment of the angular position of the arm 13 is produced as follows:

A lug 20 projects forwardly from the lower portion of the lateral projection 16, and a pin 21 extends forwardly from such lug 20. A stud 22 has its lower end threaded into the base block 10 so that by rotation of such stud it will be raised or lowered slightly. Such stud 22 is provided with the encircling groove 23 which receives the pin 21 as well shown in FIGURE 2 with a nice fit. Accordingly, when the arm 13 has been rocked to a position approximate to its desired adjustment, and with the opening 18 registered with one of the openings 17, with the pin 19 set into place between such registering holes, vernier adjustments of the angle of the arm, up or down, may be produced by slight rotations of the stud 22 in the proper direction. It is noted that by use of the vernier adjustment thus afforded, the lower end of the stud 22 is supported by the threading engagement with the base block. Accordingly, when the entire unit is raised by grasping the arm 13 or some other convenient element, the base block will also be raised, without change of the angular adjusted position which has been produced by use of such stud 22. Such arrangement is to be distinguished from an arrangement in which the lower end of the stud seats against the surface of the base block, or a hard insert, since in such latter structure there is no connection between the parts to forbid lag of the base block behind the rising movement of the arm, other than the tightened screw 14 and/or inserts between the arm and the base block, presently to be described. However, on occasion it may be desired to make angular adjustment between the base block and such arm 13, and to lift the device as thus adjusted, prior to tightening such screw. The structures above described will enable such manipulations as lifting the device after angular adjustment, and prior to tightening the screw 14, without disturbing the accuracy of the angular adjustment previously made.

The link 24 has its lower end pivotally connected to the outer end of the primary link 13 by the screw 25, which can be tightened sufficiently to hold the two links firmly in adjusted angular position with respect to each other. The carrier unit 26 has one end pivotally connected to the outer end of the link 24 by the screw 27 which can be tightened sufficiently to retain such two links in adjusted position, angularly, with respect to each other. If desired, toothed inserts such as those shown in FIGURE 6, and in position in FIGURE 2, may be includes in the pivotal connections at the screws and 27, to ensure against shift of angularity between the link 13 and the carrier unit 26, respectively.

The carrier unit 26 may be of the form shown in my copending application, Ser. No. 395,427, already referred to. Such carrier unit includes the link bar 28, having the lengthwise extending track rod 29 supported by the end lugs 30 and 31, with the block 32 freely mounted on such track rod for endwise movement on such rod, a set screw 33 being provided in the block for engagement against the track rod to lock the block in adjusted position along such rod. Such block 32 is provided with the projecting lug 34 to which the cutting tool 35 is connected. Such connection of the cutting tool to the lug includes a stem 36 extended through the lug 34 and into a block 37 directly connected to the cutting tool element, the stem being threaded into the cutting tool element so that by loosening such stem the tool may be rocked into various directions; but all such rocking movements thus produced are within a vertical plane, namely, at right-angles to the surface on which the base block 10 is set. Accordingly, with the structure as thus far described, adjustments of the cutting tool occur within such vertical plane, and I have hereinbefore referred to such adjustments as being with the tool in a vertical direction.

The structure of linkage, 13, 24, and 26, so far as described, is substantially the same as disclosed in my said copending application, Ser. No. 395,427, with the exception of various elements concerning the adjustment of the angularity of the primary link 13, and related parts.

The link or bar 24 is provided with the opening 38 extending through such bar to enable connection of the bar to the link 24 face-to-face, as shown in FIGURE 1. This connection enables operations to be performed with the cutting tool in the vertical plane, as already explained. Additionally, I have provided the opening 39 through the body of such bar 28, at right-angles to the opening 38, and of size to accommodate the screw 27. Accordingly, when desired, such bar 28 may be connected to the link 24 with the bar 28 rotated ninety degrees on its length, as shown in FIGURE 3. It is noted that such connection to the link 24 may be with the bar 28 rotated in direction to bring the lug 34 facing the observer as shown in FIG- URE 3, or the bar 28 may be rotated in the opposite direction, under which condition the lug 34 would face away from the observer. In the illustrated case the cutting tool faces the observer as shown in FIGURE 3; in the latter case, the cutting tool would face away from the observer; but in each such case rotations of the cutter supporting block 37 will produce cutter positions adjusted within a plane at right angles to that plane within which the cutter adjustments were possible, when the bar 28 is connected to the link 24 in the showing of FIGURE 1. Accordingly, with the parts assembled in the manner shown in FIGURE 3, cutting or dressing operations may be conducted on vertical surfaces, while the base block stands on a horizontal support as shown in FIGURE 1. Thus the versatility of the unit is substantially increased by the improvement now being described.

Reference has been made to the provision of means, supplemental to friction between parts, for holding the adjusted elements 13, 24, and 26, against shift, once they have been brought into adjusted positions, with respect to each other. Such supplemental means is shown in face view in FIGURE 6. It comprises a ring 40, having formed in its face numerous irregularities, such as teeth, which may be matched with the teeth of a like element, so that when the two elements are brought together, they are locked into positions. Such ring units are set into recesses formed in the proximate surface portions of the elements to be held in adjusted position. Such recesses are shown in FIGURE 2, at 41 and 42. It is noted that when such supplemental holding elements as thus described are used, each of the pair must be retained in its recess against rotation with respect to the element to which it is connected. Accordingly, to change the angular relation between two of the elements or links, 13-24, and 24-28, it is necessary to loosen the screw which extends between such a pair, sutficiently to allow the teeth of the two elements to be passed over the teeth of their companion elements. Accordingly, changes in angular positions between the links can only be made by steps, of amount depending on the numbers of teeth provided in the elements 40. Such structures are satisfactory for adjustments between the two elements 24 and 28; but since the angular adjustment between the primary link 13 and the base unit 10 is used for producing exact adjustment of the elevation of the cutting or dressing tool above the support on which the base 10 stands, provision must be made for a supplemental vernier adjustment of the angle between the primary link 13 and the base unit. I have already described an improved form of such vernier adjustment in this application.

In FIGURE 5 I have shown a further feature of improvement. In this embodiment the extension element 43 has its inner end secured to the lug 34 by the screw 44. The outer end of such element 43 is provided with an opening 45 to receive a screw by which the cutting tool element may be secured to such extension. Such extension element may be of stiff material such as steel, or in some cases, of aluminum or plastic. With such extension element in place the cutting tool will be set laterally some distance from the body of the structure -24-26- 32 and 34, thus making it possible to produce desired grinding or dressing operations under conditions which would otherwise prevent setting the base portion of the unit laterally far enough to bring the cutting tool into needed operative position.

I claim:

1. A self-contained unit for dressing a work body, comprising in combination a base block having a smooth planar mounting surface for support on a table-like element, a primary arm pivotally mounted to said base block for rocking movement about a first defined axis lying in a plane which intersects the mounting surface of the base block, means to lock the primary arm and the base block together in angularly adjusted position, a secondary link element pivotally connected to the free end of the primary arm for angular movement with respect to the primary arm about a second defined axis substantially parallel to the first defined axis, means to lock the secondary link element and the primary arm in angularly adjusted position, a dressing unit carrier, a dressing unit holder, means to support such dressing unit holder on the dressing unit carrier for endwise movement along said carrier including means to secure the dressing unit holder in adjusted position on the carrier, an axis element on the free end of the secondary link element, means constituted to pivotally support one end of the carrier on the axis element of the secondary link element with said carrier in a first defined rotated position on the lengthwise extending axis of said carrier, or with said carrier in a second defined rotated position on the lengthwise extending axis of such carrier; together with means to lock the carrier against rotary movement on the axis element of the secondary link element when the carrier is in either said first defined rotated position on its lengthwise extending axis, or in said second defined rotated position on its lengthwise extending axis.

2. A structure as defined in claim 1; wherein the means which is constituted to pivotally support one end of the carrier to the axis element of the secondary link element with the carrier in either the first defined or the second defined rotated position of the lengthwise extending axis of the carrier, comprises through bearing openings formed in the end portion of the carrier and extending through the carrier in different directions.

3. A structure as defined in claim 2; wherein the through bearings extend through the end portion of the carrier in directions corresponding to rotated positions of the carrier on its lengthwise extending axis, which rotated positions are at substantially right-angles to each other.

4. A self-contained unit for dressing a work body, comprising in combination a base block having a smooth planar mounting surface of support on a table-like element, a primary arm pivotally mounted to said base block for rocking movement about a first defined axis lying in a plane which intersects the mounting surface of the base block, means to lock the primary aim and the base block together in angularly adjusted position, a secondary link element pivotally connected to the free end of the primary arm for angular movement with respect to the primary arm about a second defined axis substantially parallel to the first defined axis, means to lock the secondary link element and the primary arm in angularly adjusted position, a dressing unit carrier, a dressing unit holder, means to support such dressing unit holder on the dressing unit carrier for endwise movement along said carrier including means to secure the dressing unit holder in adjusted position on the carrier, and a pivotal connection between the dressing unit carrier and the secondary link, and means to lock said carrier and said secondary link in adjusted position; wherein the means to lock the primary arm in adjusted position with respect to the base block, comprising; a segment secured to the primary arm and including a plurality of openings arranged at equal radii from the pivotal connection between the base block and the primary arm, an opening in the primary arm at the same radius from such pivotal connection between the primary arm and the base block, as the radii of the plurality of openings in the segment, a stud extending between one of the plurality of openings in the segment, and the opening of the primary arm; means to adjust the segment angularly with respect to the base block, comprising a stem extending adjacent to a portion of the segment and threaded into the base block for vertical adjustment with respect to such base block, an encircling groove in said stem, and a laterally extending stud on the segment, extending into said groove of the stud; together with means to lock the segment and primary arm in adjusted angular position with respect to the base block.

5. A self-contained unit for dressing a work body, comprising in combination a base block having a smooth planar mounting surface for support on a table-like element, a primary arm pivotally mounted to said base block for rocking movement about a first defined axis lying in a plane which intersects the mounting surface of the base block, means to lock the primary arm and the base block together in angularly adjusted position, a secondary link element pivotally connected to the free end of the primary arm for angular movement with respect to the primary arm about a second defined axis substantially parallel to the first defined axis, means to lock the secondary link element and the primary arm in angularly adjusted position, a dressing unit carrier, a dressing unit holder, means to support said dressing unit holder on the dressing unit carrier for endwise movement along said carrier, including means to secure the dressing unit holder in adjusted position on the carrier, means to lock the dressing unit carrier and the secondary link element in adjusted position, an extension unit constituted for attachment to the dressing unit holder for lateral extension from the dressing unit holder, means to removably connect such extension unit to the dressing unit holder, and a dressing unit in connection with such extension unit, and means to removably connect the dressing unit to said extension unit.

6. A structure as defined in claim 5; wherein said extension unit comprises a body of plastic.

References Cited UNITED STATES PATENTS 2,402,945 7/1946 Brocker 1l 2,425,453 8/ 1947 Bavasi 125--l1 2,458,768 l/ 1949 Daily 125-11 3,324,843 6/1967 Koch 12511 OTHELL M. SIMPSON, Primary Examiner.

Images