US2720875A - Diamond mounting for abrasive wheel forming device - Google Patents

Description

Um. 18, 1955 F. o. HOAGLAND DIAMOND MOUNTING FOR ABRASIVE WHEEL. F'ORMING DEVICE Filed March 6 1951 Ill-l will! si d1!!! ,4, u

United States Patent DIAMND MUNTNG F R ABRASIVE WHEEL FORMING DEVICE Frank 0. Hoagland, West Hartford, Conn., assignor to Niies-Bement-Pond Company, West Hartford, Conn., a corporation of New Jersey Application March 6, 1951, Serial No. 214,165 2 Claims. (Cl. 12S- 11) This invention relates to abrasive wheel dressing or forming devices and more particularly to a diamond mounting member for a pantograph type tracing device adapted for forming the work engaging surface of an abrasive wheel to a predetermined contour.

An object of the present invention is to provide on one of the links of a pantograph tracing deviceV a p'air of diamonds spaced slightly apart and movable over the Work engaging surface of the wheel, one diamond being usable for the rough forming operations, and the second diamond used for linal or finish forming an'd redressing the work engaging surface of the abrasive wheel.

A feature of importance of the invention is that the diamonds are mounted within a suitable block or member secured to or forming the end of one of the pantograph linkage members, the points of the diamond being aligned with the axis of oscillation of the link, one of the other links of the pantograph linkage being traced over the surface of a template having the desired contour, the axis of one of the diamonds being preferably iixed in position within the block and the second, or companion, diamond being so mounted that adjustment laterally to a slight degree is permitted relative to the lirst diamond; also, preferably the two diamonds are independently adjusted axially to bring their ends into alignment with the axis of oscillation of the link. v

Another feature of importance is that the wheel dressing ends of the diamonds, when in their properly adjusted positions, are both in alignment with the axis of oscillation of the pantograph lever on which they are mounted, and also are in alignment with the direction of movement of the work table on which the forming or dressing device is mounted.

With the above and other objects in view, the invention may include the features of construction and operation set forth in the following specification and illustrated in the accompanying drawing.

In the accompanying drawing annexed hereto and forming a part of this specification, I have shown the invention embodied in a pantograph type template tracing forming device for abrasive wheels, but it will be understood that the invention can be otherwise embodied and the drawing is not to be construed as delining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

In the drawing:

Figure l is a perspective view of a dressing or forming device for abrasive wheels to which the present invention is applicable;

Fig. 2 is a central sectional view through a linkage member of the tracing device on which the diamond dressing tools are mounted;

Fig. 3 is a side elevation of the diamonds within their retaining block;

Fig. 4 is a section of the block taken approximately on the plane of line 4-4 of Fig. 3; and

Fig. 5 is a plan view of the block with the diamond tools in position therein.

In the above mentioned drawing there has been shown but one embodiment of the invention which is now deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

The present invention relates to and is an improvement in the wheel `forming device shown in the patent to Porter et al. No. 2,469,844, granted May 10, 1949.

In the Porter et' al. patent, the forming device comprises a pantograph linkage, one member of which is provided with a tracer adapted to follow the outline of any form of desired template. Movement of this tracer' along the template surface correspondingly moves, on a greatly reduced scale, a single diamond positioned to contact the work engaging periphery of the wheel so that this surface of the wheel will be conformed to the outline of the ternplate but upon a greatly reduced scale.

In the operation of this type of wheel dressing devices, a considerable amount of abrasive material must be removed from the wheel to originally conform the Wheel surface to that of the template. This causes an appreciable amount of wear upon the diamond with which de vices` such as that shown in the' Porter et al. patent are provided. It has, therefore, been proposed to mount a second diamond inalignment with the first diamond so that by first roughly conforming the wheel by using the iirst or roughing diamond, the work table on which the device is mounted can be manually adjusted in the direction of its travel as shown by the arrow in Fig. 1 to properly present the second or finishing diamond to the periphery of the wheel.

To accomplish first a roughing and then a finishing operation with separate diamonds, it is essential that the two diamonds be accurately positioned vertically relative to each other, accurately aligned with the axis about which the link on which they are mounted oscillates, and, to permit adjustment from one diamond to the other, the two diamonds also should be aligned with the direction of movement of the table.

Referring more in detail to the figures of the drawing, and first to Fig. l, it will be seen that a pantograph tracing device 10 is mounted in tixed position on the surface of a reciprocating Work supporting table 12. The tracer 14 of the pantograph device 10 may be moved manually along the edge of a template 16 on the tracing device, which movements correspondingly move a link 18 at a greatly reduced rate. On the link 18 are the wheel contacting diamonds 20 and 22. As the tracing device 10 and form of link 18 by which the diamonds are actuated and tilted form no part of the present invention, it is not thought that further description of these parts will be necessary. The link 18 at its free end and in position to engage the surface of the wheel 24 being formed or dressed is provided with a block 26 in which the diamond tools 20 and 22 are adjustable substantially vertically by small screws 28. This positioning of the diamonds is accomplished by mounting of the two diamonds in the block 26 generally similarly to that shown in the Porter et al. patent in which clamping or securing means 30 are provided to retain the block in position on its link 18. The block 26 itself, as shown in Figs. 3, 4 and 5, has slightly inclined openings for the spaced diamond tool holders 20 and 22. Below the diamonds within the block are provided the screws 28 contacting the lower ends of the diamond tools to independently adjust the diamonds vertically within their recesses. Also, clamping means, presently to be more fully described, are provided for securing the diamonds respectively in adjusted positions within their recesses.

The securing means 30 for the block 26 may be, as shown in Fig. 2, in the form of a screw passing obliquely through an enlarged opening 31 in the link 18. The threaded end of screw 30 enters a threaded hole in a portion of the block 26. By virtue of the opening 31 in the link 18 being larger than the shank of the screw 30, the block 26 may be adjusted laterally a small distance. Also by the screw 30 the block 26 may be secured in its adjusted lateral position.

To effect slight lateral adjustments of the block 26 a pivotally mounted lever 33 is mounted in the link 18. The outer end of this lever 33 enters a recess formed in one side of the block 26 and the other end may have an adjusting screw 35 by which the lever 33 may be slightly oscillated to laterally adjust block 26 before clamping the block in position by means of screw 30. The above described construction corresponds substantially to what is shown in the patent to Porter 2,601,456, granted June 24, 1952.

The first diamond 20, as shown in the figures, is mounted slightly obliquely in a vertical plane in a cylindrical hole into which it may t readily, and may be adjusted vertically by its small screw 28 in the lower end of the block contacting the lower end of the diamond holding tool. A clamping screw 32 contacting the tool near its upper end secures the diamond 20 in position. The second diamond 22 is similarly mounted in a Slightly oblique hole into which it may iit, this hole being parallel to the hole for the first diamond 20, but, as will be seen in Figs. 4 and 5, the hole for diamond 22 is not cylindrical but is greater in diameter laterally than in the direction of movement of the table 12 on which the device is mounted. Screws 34 extending horizontally withinthe block 26 engage the diamond tool holder on opposite surfaces so that the lateral position of the diamond 22 may be accurately adjusted. Also, this diamond may be adjusted vertically by its screw 28 within the block similar to that provided for the rst diamond. A clamping screw 36 retains the diamond 22 in position and a similar screw also may be used for diamond 20.

It will be seen from the above that by means of the adjusting screws 28 and 34 the positions of they diamonds 20 and 22 may be brought exactly into alignment with the axis of oscillation of the link 18 on which they are mounted and that the lateral position of the second diamond 22 to the first diamond 20 may be adjusted by the opposed screws 34 engaging opposite sides of the second diamond. The adjustment of the diamonds so that their wheel engaging points are in alignment with the axis of oscillation of member 18 is provided so that the diamonds may be oscillated about this axis without adversely affecting the precision of the truing action. This feature is fully described in the patent to Porter et al. referred to above. With the diamonds 20 and 22 adjusted so that they are in alignment with the axis of oscillation of the pantograph link member 18 and one diamond is directly behind the other in the direction of travel of the table 12 on which the device is mounted, one diamond 20 may be used for a roughing operation and, by movement of the table with the dressing attachment thereon an amount equal to the distance between the diamonds, the second diamond 22 may be brought into wheel-engaging position for the final or finish forming operation.

I claim as my invention:

1. A contourng device for abrasive wheels comprising a pantograph tracing mechanism, said mechanism being mountable on the work reciprocating table of a grinding machine, a link forming part of said tracing mechanism having a diamond receiving member removably mounted thereon, a diamond tool mounted in said member for vertical adjustment, and a second diamond tool mounted therein for vertical and oblique adjustment, and means in said member for independently adjusting said diamonds, whereby said diamonds may be aligned in the axis of oscillation of said link and in the direction of movement of said table.

2. A diamond holder for an abrasive wheel forming device comprising a block removably mounted on a link of a pantograph tracing mechanism, means permitting oscillation of said link about an axis, said mechanism being mountable on the work table of a grinding machine, a diamond tool mounted in said block for adjustment toward and from said axis of oscillation, and a second diamond tool independently mounted therein for adjustment parallel to said rst diamond and lateral adjustment, whereby said diamonds may be aligned in the direction of movement of said table.

References Cited in the file of this patent UNITED STATES PATENTS 2,355,020 Turrettini Aug. 1, 1944 2,373,187 Johanson Apr. 10, 1945 2,469,844 Porter May 10, 1949 2,584,003 Engelmann Jan. 29, 1952 FOREIGN PATENTS 395,895 Great Britain July 27, 1933 617,343 Germany Aug. 16, 1935

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