US736843A - Tool-grinder. - Google Patents

Description

PATENTED AUG. 18, 1903. R. U. GREBNER-D.

TOOL GRINDER. APPLICATION FILED NOV. 7, 1902.

N0 MODEL.

'NVENTOF? WITNESSES Tatented August 18, 1903.

UNITED STATES PATENT OFFICE.

ROBERT C. GREENERD, OF WINTHROP, MASSACHUSETTS.

TOOL-GRINDER.

SPECIFICATION forming part of Letters Patent No. 736,843, dated August 18, 1903.

Application filed November 7,1902. Serial No. 130,891. No model.)

To all whom it may concern:

. Be it known that 1, ROBERT C. GREENERD, a citizen of the United States, residing at Winthrop, in the county of Suifolk and State of Massaehusetts,have invented certain new and useful Improvements in Tool-Grinders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to machines for grinding tools, especially to those machines in which rotating grindingwheels are used and in which means are provided for holding in the proper position the tool to be ground.

This invention has among other objects the following: to provide for the equal distribution of Wear over the Working surface of the grinding-wheel, to provide improved means for rapidly adjusting the position of the tool with respect to the grinding-surface whereby the correct angle may be imparted to the cutting portion of the tool, to provide means whereby the ground surface of the tool may be made concave, and to reorganize and improve machines of this character in other respects hereinafter pointed out.

The present invention consists in the devices and combinations of devices hereinafter described and claimed.

In the drawings accompanying this specification, Figure 1 is a front elevation of a machine embodying my invention, the lower part of the machine being broken away. Fig. 2 is a side elevation looking toward the left of Fig- 1. Fig. 3 is avertical section of the tool-rest. Fig. 4 is a front view of the tool-rest.

The illustrated embodiment of my invention is constructed as follows:

To the column or standard 1 of an ordinary grinding-machine is attached a base-plate 2, which carries all the mechanisms peculiar to this invention. The grinding-wheel 3 has its working face upon an annular raised portion on its side-21 9., it'is known by those skilled in the art as a side-grinding wheel. The wheel is carried on a spindle in bearingst f on the column 1. A belt 5 around a pulley on a counter shaft in the base of the machine {not shown) drives the spindle and the wheel.

The tool-carriage is made as follows: Upon a plate 6 is a lug 7 to which is bolted a lug on a tool-clamp 8. This clamp is adapted to hold the shank of a tool to be ground by means of a set-screw 9, and the joint described permits the angle of presentation of the tool to the face of the wheel to be conveniently adjusted. A second clamp 10 is rigidly fixed to the plate, at an angle of ninety degrees to the surface thereof,andathird clampllis attached at an angle of sixty degrees. A table 12, attached perpendicularly to the face of the plate, has grooves upon its face of a width sufficient to receive the shank of a tool. These grooves are arranged, preferably, at an angle of sixty degrees with one another. By resting a tool in these grooves successively and presenting the end of the tool to the Wheel, steadying the tool by hand, an angle of sixty degrees may be quickly and conveniently imparted to the point of the tool, as is desirable in the case of a thread-tool. The portion of the tool-carriage as thus far described constitutes a tool rest or support. The plate 6 has a stem 13, which may be rotated and clamped in a split sleeve 14. By means of a spring-pressed pin cooperating with holes in the plate the latter may be conveniently set at predetermined angles. This sleeve 14 has also a stem embraced by the split sleeve 15, in which it may be swiveled and clamped. The sleeve 15 is attached to the end of a feed-slide 16, which is carried in ways 17 and moved by a pinion on the shaft of a hand-wheel 18, the said pinion meshing with a rack on the bottom of the slide. The ways are pivoted to an arm 19, the other end of which is pivoted to a vertical stem 20, which may be rotated, raised or lowered, and clamped in a split sleeve 21.

By means of the above-described arrangements tools of various forms may be rapidly and conveniently ground to the correct angle. In grinding a thread-tool for a lathe the rest is rotated about its stem 13 until the grooved table 12 is in ahorizontal position. The rest is clamped in this position by the split sleeve 14. The upper part of the carriage is then tilted about its joint upon the upper end of the arm 19 in order to give the proper clearance to the point of the tool. The entire carriage is then lowered by loosening the split sleeve 21 and lowering the stem therein in order to bring the end of the tool opposite the proper part of the grinding-wheel. The tool to be ground is then held in the two grooves in the table successively by hand and the rest moved forward bythe hand-wheel 18 in order to bring the tool in contact with the grinding-wheel.

'In this wa T an an le of sixt Y de rees is imparted to the point of the tool without any further adjustment. To grind a diamond-point tool, the tool is clamped in the swivel-clamp 8, which is then rotated to the position now occupied in the drawings by the grooved table, and the clamp is turned about its joint upon the lug 7 to give the correct angle to the end of the tool. After grinding one side of the tool with the clamp in this position the clamp is turned in the opposite direction upon its swivel in order to grind the other side of the tool. The top of the point is then ground by turning the rest around the axis of the stem 15 and rotating it through an angle of ninety degrees about the stem 13. A side tool is held in the adjustable clamp or any of the fixed clamps, and to grind the side of the tool the carriage is rotated about the stem 15 through an angle of about ninety degrees from the position shown in the drawings. In order to grind the top of the tool, the rest is then rotated through a sufficient angle about the stem 13.

In order that the wear may be equally distributed over the face of the wheel, means are provided for giving to the tool a reciprocating motion substantially parallel to an element of the grinding-surface. The sleeve 21 is attached to a horizontal stem 22, which is free to turn in a sleeve 23. This sleeve is adjustably attached to the base-plate by a stem 24, clamped in a lug 25, extending from the baseplate. An arm 26, attached to the sleeve 21, is connected by a universal joint to a connecting-rod 27, the other end of which is connected by a universal joint to a stud 28, free to turn in a journal in a worm-wheel29. Thewormwheel turns on a stud fixed to an extension from the bed-plate. The worm-wheel is rotated bya worm 30, fixed to a shaft 31, on the other end of which is fixed a pulley 32, over which the belt 5 passes. The pitch of the worm is such that it communicates a slow revolution to the worm-wheel, and as the axis of the latter is above the path of motion of the end of the arm 26 a reciprocating motion is communicated to the arm by the connectingrod. In this manner the entire tool-rest is oscillated about the axis of the stem 22 and sleeve 23, and the tool, remaining constantly in contact with the face of the wheel, is caused to traverse the face, so that the form of the wheel is perfectly preserved and it is impossible for grooving to occur. To provide for lateral adjustment of the tool across the face of the wheel, the connecting-rod 27 is divided and the ends threaded left and right and a turnbuckle or nut 33 is provided by means of which the length of the connecting-rod may be varied and the angular position of the carriage altered.

As those skilled in the art are aware, a tool will out better if the ground surfaces are slightly concave. In my machine I make the working face of the wheel in the form of a truncated cone, which permits the grinding of concave surfaces. In order that the conical surface of the wheel may be preserved, the path of oscillation of the tool should be substantially parallel to an element of the conicaldicular to the face of the wheel- In this position it would be properly arranged for the use of a wheel with a fiat face, as shown by dotted lines, Fig. 2.

I am aware that it has been proposed in the prior art to reciprocate a tool being ground over the grindingsurface of the grindingwheel in the direction of motion of the surface of the grinding-wheel; but such a construction is clearly differentiated from my invention in important respects and among others by the fact that in my construction the tool is reciprocated across the face of the grindingwheel and in a line perpendicular to the direction of motion of the surface of the grinding-wheel in contact with the tool.

I am also aware that it has been proposed in the prior art to reciprocate a tool being ground across the face of a grinding-wheel once for each revolution of the wheel; but such construction is clearly differentiated from my invention by the fact that certain portions of the grinding-wheel are never brought in contact with the tool, While in my machine every portion of the grinding-surface of the grinding-wheel is brought in contact with the tool with as much fre qu ency as every other portion.

Wherever in the claims I have used the term tool-holder I intend thereby to include any sort of means forholding the tool to be ground.

The present invention is not limited to the specific embodiment thereof illustrated in the drawings and described herein, as it may be embodied in otherforms widely differingtherefrom in construction which arewithinthespirit of my invention.

Having thus described my invention, I de sire to secure by Letters Patent- 1. A tool-grinder, having, in combination, a rapidly-rotating grinding-wheel, means for holding a tool in contact with the grinding surface of the grinding-wheel, and automatic means for imparting a slow relative motion to the grinding-wheel and tool-holder so as to move the tool transversely to the direction of motion of the portion of the surface of the grinding-wheel in contact therewith continuously during the grinding operation, so that upon each successive rotation of the wheel the tool will come in contact with different portions of the grinding-surface of the wheel, substantially as described.

2. A tool-grinder, having, in combination,

a rapidly-rotating grinding-wheel provided with a grinding-surface on its side, a toolholder for supporting a tool in position to be acted upon by the grinding-surface of the 3. A tool-grinder, having, in combination,

a rapidly-rotated grindingwheel, and means for holding a tool in contact with the grind ing-surface of the grinding-wheel, one of said members being held in fixed position and the other of said members being supported to oscillate in a plane parallel to the grinding-sur face of the grinding-wheel and in a line substantially normal to the direction of motion of such grinding-surface at the point of contact, and automatic means for imparting a slow relative motion to the grinding-wheel and tool-holder, substantially as described.

4. A tool-grinder, having, in combination, a grinding-wheehan oscillating tool-holder,

means for oscillating the tool-holder consisting of a rotating member having an eccentric stud secured thereto, and connections between said eccentric stud and the oscillating toolholder, substantially as described.

4 5. A tool-grinder, having, in combination, a grinding-wheel and a tool-rest, said rest comprising a plurality of clamps adapted to hold the tool to be ground, said clamps being fixed at different angles with the axis of the toolrest, substantially as described.

6. A tool-grinder, having, in combination, a grinding-wheel, an oscillatory tool-holder, means for actuating the tool-holder comprising a pulley adapted to engage the belt by which the grinding-wheel is driven, substantially as described.

7. A tool-grinder, having, in combination, a grinding-wheel, a tool-holder, a feed-slide, said tool-holder and feed -slide being connected by universal adjusting means, an arm to the upper end of which the feed-slide is pivotally connected, a stem to the upper end of which the lower end of the arm is pivotally connected, a clamp-sleeve for embracing the stem, and means for pivotally supporting the said sleeve, substantially as described;

8. A tool-grinder, having, in combination, a rapidly-rotating grinding-wheel, means for holding a tool in contact with the grindingsurface of the grinding-wheel, means for oscillating one or said members in a plane parallel to the grinding surface of the grinding wheel and in a line substantially normal to the direction of such grinding-surface at the point of contact, and means for adjusting the axis of oscillation of said oscillating means, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ROBERT C. GREENERD. Witnesses:

HoRAcE VAN EVEREN, FARNUM F. DORSEY.

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