US2764144A - Mounting of diamond dressing tools - Google Patents

Description

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2,764,144 p MOUNTING OF DIAMOND DRESSING TOOLS Harold Stuart Hallewell, Hillingdon Heath, England Application December 28, 1951, Serial No. 263,770

Claims priority, application Great Britain January 3, 1951 4 Claims. (Cl. 12S- 11) The present invention relates to improvement-s in mountings for diamond or other dressing tools for use in profiling equipments, for example grinding wheel dressing equipments, for example of the kind which are adapted to translate a form from a template to the grinding wheel or other member to be dressed, and has for its object to provide a mounting which will enable the operator of the equipment to change over quickly and easily from one diamond or other tool, e. g. a roughing or worn finishing diamond no longer suitable for finish trueing to another tool, e. g. a new or slightly worn finishing diamond such as is normally necessary for accurate reproduction.

With this object in view, the present invention provides for detachably mounting two or more dressing tools in tandem in the tool-supporting member of the equipment which is normally a spindle capable of being rocked about its axis and is adapted to traverse across the surface of the member to be dressed or profiled (see for example patent specification No. 2,469,844) the arrangement being such as to permit said tools to be adjusted laterally relative to said axis.

An improved mounting according to the present invention comprises a spindle provided with a bracket, which is mounted to traverse across the profile of a grinding wheel or other member to be dressed or profiled and is formed with a recess for the reception of at least two tool carrier blocks in tandem, means for adjusting said carrier blocks laterally with respect to said axis, and individual clamping means for said blocks adapted when tightened to clamp the blocks against locating surfaces formed by surfaces of said recess.

In order that the invention may be clearly understood and readily carried into effect it will now be described in more detail with reference to the accompanying drawings, in which:

Fig. 1 is a side view of a mounting according to the invention for grinding wheel dressing equipment,

Fig. 2 is a plan view of part of the mounting of Fig. l, looking in the direction of the arrow X, with the carrier blocks of Fig. 1 removed, and

Fig. 3 is a view of part of the mounting showing a modiication thereof.

The mounting includes a curved arm 1 of channel section formed integrally on a spindle 2 which is mounted in bearings 3, carried by a member 4, for angular movement about an axis Y-Y. Member 4 may for example be a linkage of a pantograph mechanism as described in patent specification No. 2,469,844. The arm 1 is formed at its outer end with a recessed bracket portion 1 bounded by bottom surfaces 5, 6 and 7 and side surfaces 8, 9 and 10. Said recessed bracket portion serves as a well to receive three diamond tool carrier blocks 12, 13 and 14, into which are secured respectively diamond tools 15, 16 and 17 by means of locking screws 18. Each block is provided with its own holding-down means and its own alignment adjustment means. The holding-down means of block 12 includes a tension bolt 19 which projects States Patent O j 2,764,144 Patented Sept. 25, 1956 lCC through a bore formed in the outer corner of the bracket 1 at about 45 to the surfaces 5 and 8, the bolt 19 engaging a screw-threaded bore in the block 12 and being provided with a milled knob 20 `which enables the bolt 19 to be tightened so a-s to draw the block 12 down against the surfaces 5 and 8. The alignment adjustment means for block 12 comprises a knurled ring 21 fixedly mounted on a screw-threaded spindle 22 which is mounted in screwthreaded bores in two lugs 23 on the arm 1. The ring 21 engages a groove 24 formed in the side of the block 12, and the spindle 22 carries a knurled adjusting knob 24, angular movement of which causes the ring 21 to move laterally with respect to the axis Y-Y of the spindle 2, and by entraining the block 12 to move the latter in one direction or the other to align it suitably. It will be understood that the required alignment adjustment will always be very small and is permitted by the gap between the ring 21 and the space between lugs 23, the bolt 19 being eased when it is desired to adjust the alignment of the block.

The holding down means for block 13 comprises a tension bolt 25 provided with a knob 26. It co-operates with a screw-threaded bore in block 13 so that when tightened it draws the block down on to the surfaces 6 and 9. The alignment adjusting means for block 13 comprises a knurled ring 27 which is tixedly mounted on a screw-threaded spindle 28 which projects into screwthreaded bores in the sides of the channel-section arm 1 and is provided with a knob 29. The ring 27 projects through slots in the corner of the walls of the bracket having the surfaces 6 and 11, and into a groove in the sideof the block 13.

The holding down means for block 14 comprises a tension bolt 30 provided with a knob 31, and which engages a screw-threaded bore in block 14 so that appropriate angular movement of knob 31 causes the bolt 30 to draw the block 14 down on to the surfaces 7 and 1d. The alignment adjusting means for block 14 is in the form of a control lever mechanism, comprising a lever 32 pivotally mounted on a lug 33 on the inside of the channelsection arm 1. One end of lever 32 projects through a slot 34 in the side wall of the bracket having the surface 10 and engages a groove 35 in the side of block 14, and the other end `of the lever 32 is formed with a recess into which projects a ring 36 ixedly mounted on a screwthreaded spindle 37 which engages screw-threaded bores 1n bosses 38 formed on the side walls of the channelsectlon arm 1 and is provided with a knob 39.

The height-adjusting means for the diamond tools 15, 16 and 17 in the blocks 12, 13 and 14 comprises backingup screws, accessible through holes 4) in the walls of the bracket having the surfaces S, 6 and 7, and engaged in screw-threaded bores in the blocks (see application Serial No. 90,951 filed May 2, 1949, which issued as Patent No. 2,601,456, lune 24, 1952).

The slide or tool-supporting member on which the mounting is carried is first adjusted so as to align the diamond tool 17 with the vertical centre line B of the grmdlng wheel 41, which is rotated in the direction of the arrow A. The tool 17 is a roughing or worn finishing dlamond, and is used for first removing the bulk of the material from the edge of the grinding wheel. It is set low, for example approximately 0.085, so that after it has been used there is sufiicient wheel stock left for the diamonds 16 and 15 to remove. After rough shaping of the grinding wheel, the diamond tool 16 is aligned with the vertical centre line B of wheel 39 and is employed to semi-finish the contour of the grinding wheel. it also is set low, for example by 0.002, so as to leave suicient stock for the nishing operation which is effected by aligning the tool 15 with the vertical centre lline B. Tool 1S, which is set to the correct height, is a true nishing diamond, and is used only for light finishing cuts, thereby considerably extending its accurate life. it becomes worn it can then Ybe used as the semi-'finishing diamond and, after further wear, as the roughing diamond. The desired setting of the tools may be effected by, means of an indicator as described in application Serial No. 90,951 (PatentNo. 2,601,456). n

The present invention may obviously be applied not only to mechanism for dressing grinding wheels but also to mechanism for profiling copper or other metal blanks, the diamond dressing-tools being replaced for example by diamondtipped turning tools or carbide tipped tools.

Screws 22, 28 and 37 may be xedly, i. e., non-rotatably mounted, wheels 21, 27 and 36 being rotatable on the respective screws and being formed as knurled nuts. This modification is shown in Figure 3.

I claim:

l. A tool mounting for dressing or profiling equipment, comprising a spindle provided with a bracket extending therefrom and adapted to traverse a predetermined profile of a grinding wheel or other ymember to be dressed or profiled, said bracket being formed with a transverse recess adjacent its outer end, at least two tool carrier blocks in tandem therein, locating Vsurfaces in said recess extending at an angle to each other to form corners, individual means in said bracket adapted to adjust said carrier blocks laterally with respect to the spindle axis, and individual clamping means in said bracket for said blocks adapted when tightened to clamp the blocks in any lateral adjustment against said locating surfaces.

2. A tool mounting for a dressing device for abrasive wheels, comprising a spindle having a bracket portion extending therefrom and provided adjacent its outer end with a recess, two locating surfaces in said recess extending at an angle to one another to form a corner, a laterally adjustable tool carrier block in said recess, a clamping screw mounted in said bracket portion and projecting between said surfaces from said corner so as to be capable of engaging said tool carrier block to clamp said block in any lateral adjustment against said two surfaces, said portion also being formed to provide a well having at least two further surfaces in said recess eX- tending at an angle to one another to form a further corner, and a further clamping screw mounted in said When ultimately bracket portion and projecting between said two further surfaces from said cornerV so as to be 'capable of engaging a further tool carrier block to clamp said block against said two further surfaces.

3. A tool mounting for a dressing device for abrasive wheels, comprising a spindle having a bracket portion extending therefrom and provided adjacent its outer end with a recess having two opposed spaced apart first side surfaces, two bottomV surfaces extending one from each of said side surfaces toward the other side surface, two further opposed side surfaces extending one from each of said bottom surfaces, and a further bottom surface interconnecting said further side surfaces to form a well between said first-mentioned bottom surfaces, a first clamping screw mounted in said bracket portion and projecting between one of said rst side surfaces and the associated bottom surface from the corner therebetween, a second clamping screw mounted in said bracket portion and projecting between the other of said first side surfaces and the associated bottom surface from the corner therefrom, and a third clamping screw mounted in said bracket portion and projecting between one of said further side surfaces and said further bottoni surface from the corner therebetween.

4. A tool mounting according to claim 3, wherein said side surfaces are substantially at right angles to the associated bottom surfaces.

References Cited in the lile of this patent UNITED STATES PATENTS 146,450 Haskins Jan. 13, 1874 180,409 Alvord Aug. 1, 1876 262,081 Mets Aug. 1, 1882 627,099 Clugston June 20, 1899 1,073,964 Dabbs Sept. 23, 1913 1,098,026 Domizi May 26, 1914 2,321,765 Mayer June 15, 1943 2,328,359 Ramsdell Aug. 31, 1943 2,377,822 Starn June 5,V 1945 2,402,650 Maflia .Tune 25, 1946 2,404,148 Thompson July 16, 1946 FOREIGN PATENTS 641,397 Great Britain Aug. 9, 1950

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