US2355582A - Counterbore and spot-facer tool - Google Patents

Description

8, 1944. E. A. ZEMPEL 2,355,552

- COUNTER BORE AND SPOT FACER TOOL I Filed March 17, 1943 lllluliiiiiiiiiiiiii INVENTOR EDWARD A. ZEMPEL ATTORNEYS Patented Aug. 8, 1944 UNITED STATES PATENT 0 F'FICE COUNTERBORE AND SPOT-FACER TOOL Edward A. Zempel, Milwaukee, Wis. Application March 1'7, 1943, Serial No. 479,456

2- Claims.

This invention appertains to machine tools and and held to its original cuttingposition after sharpening.

A further important object of my invention is the provision of a spot facer and counterbore tool having a freely removable blade which can be adjusted forwardly as the blade is resharpened, whereby the blade can be used for substantially its entire length before being discharged.

A still further object .of my invention is the provision of an adjustable spot facer and counterbore tool of the above character, which embodies a minimum number of parts and one which can be manufactured and placed upon the market at a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawing, in which drawing:

Figure 1 is a side, elevational view of my complete tool with parts thereof broken away and in section to illustrate structural detail.

Figure 2 is a View similar to Figure 1 but looking at right angles thereto and showing the use of a removable pilot sleeve for permitting the tool to be used in different sized openings.

Figure 3 is a side, elevational View of the body or shank of the tool with the various parts removed therefrom.

Figure 4 is a detail, diametric, sectional view through the tool taken on the line 4-4 of Figure 1 looking in the direction of the arrows.

Figure 5 is an end, elevational view of my novel tool.

Figure 6 is a detail, perspective view of the blade utilized.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter C generally indicates my improved counterbore and spot facer tool and the same includes an elongated cylindrical body l0 having the head ll formed on the forward end thereof and the tapered shank l2 on its opposite end for insertion in the chuck of a machine.

The cylindrical body I!) is provided with relatively fine threads l3 from one end thereof to the other and as illustrated, the threads extend to the head ll. A diametrically extending slot 14 also extends substantially the full length of the body and this slot extends into the head II. The forward end of the head has formed integrally therewith the pilot l5. A centering and blade guiding rib I6 is formed integrally with the head I l and the pilot [5 and extends into the slot M, for a purpose, which will be more clearly set out. It is to be noted, however, that the rib lfi extends transversely across the slot I4. The head H is provided with a flat front face and its inner surface is provided with a, tapered annular shoulder I1. The head on opposite sides is provided with chip clearance grooves l8.

Detachably associated with the body of the tool is the blade l9. This blade is formed from a flat piece of tool steel and is axially bifurcated by an elongated slot 2!]. This slot extends from the forward end of the blade to a point short of the inner end thereof and hence the blade, when viewed in side elevation, is of a substantially U- shape. The slot 20 defines on the opposite sides thereof cutting edges 2|. The inner end of the blade, at its corners, is provided with inclined shoulders 22, for a purpose which will later appear.

The slot 20 has a width substantially equal to the thickness of the rib l6 and the blade is adapted to straddle the rib and the opposite walls of the slot are adapted to snugly engage the opposite faces of the rib. Likewise, the thickness of the blade is substantially equal to the width of the slot M in the body of the tool and the blade is adapted to be inserted in said slot [4 and held therein against lateral shifting and chattering by the walls of the slot Hi.

When the blade is inserted in the slot l4 the same is pushed forwardly into engagement with the rib it which acts as a guide and center therefor. After the blade has been inserted in place, the adjusting nut 23 is fed forwardly on the shank so as to push the blade forward into firm contact with seats 24 arranged on opposite sides of the rib [6. Hence the nut 23 is used to accurately adjust the blade forwardly and to hold the same in its set cutting position. The forward face of the nut 23 is tapered, as at 25, for en- '24 shown in said figures.

gagement with the shoulders 22 on the blade and the taper of the nut is the same as the taper of the annular shoulder l1 and thus th nut can be fed down to the head as the blade wears from resharpening.

A lock nut 26 is also threaded on the shank into intimate contact with the adjusting nut 23 after the nut has been threaded to its desired position and the lock nut effectively holds the adjusting nut in its set position against movement.

When it becomes necessary to resharpen the blade l9 it is merely necessary to back off the nuts 23 and 26 on the 'body away from the blade and to then remove the blade from the body. Obviously, this can be accomplished without removing the body of the tool on the machine or by changing of the setting of the tool on the machine. The blade can now be sharpened in the ordinary manner and after sharpening can be reassociated with the body of the tool and moved back to its original cutting position by the nut 23.

Great stress is laid on the manner of holding the blade in position, in that substantially the entire length of the blade can be used before the same will have to be discarded. Also the arrangement is such that a minimum number of parts is utilized and the blade is so held that chattering thereof in the body is eliminated.

Further, as the blade is removed from the body of the tool during sharpening, the chip clearance grooves 18 are not damaged in any way by such resharpening and the holding of this chip clearance at all times is not efiected.

As the tool will be used in different sized openings, I preferably provide a plurality of different .size sleeves 28 for removable association with the pilot l5 and these sleeves can be held in place by the use of a washer 29 and fastening screw 30. As stated, the blade is held and centered at By referring to Figure 1, it can be seen that the tapered face of the recess 25 corresponds to the incline or taper of the shoulders 22.

Particular stress is laid on the arrangement and 1 formation of the web or rib I6 as not only does this rib or web center and guide the cutting .blade l9 but the same reinforces the head and the pilot.

7 Particular attention is again directed to Figures l and 3 and the arrangement of the seat The cutting edges 2| of the blade extend from the side edges of the "blade to the walls of the slot 20 and the inner corners of these cutting edges are received in the seats 24. Hence the cutting edges are active all the way from the side edges of the blade to the pilot. This prevents the forming of a fin 5 in the work around the pilot.

Changes in details may be made without departing from the spirit or the scope of my invention, but what I claim as new is:

1. A counterbore and spot facer comprising a cylindrical body having an annular head formed on its forward end and a shank on its rear end, said body and head being providedwith a diametrically extending blade receiving slot and said body being threaded from the head to a point beyond the slot, a centering and guiding rib at the forward end of said slot having seats on the opposite sides thereof, the rib extending transversely across the slot, a flat blade positioned in said slot and having formed therein a longitudinally extending slot extending substantially the full length thereof for receiving the rib, the slot in the blade defining cutting edges at the forward end of the blade and on the opposite sides of the slot, and a nut threaded on the body to engage with the rear end of the blade for moving the blade forwardly into engagement with said seats, the adjusting nut having its forward face provided with a tapered recess and tapered shoulders formed on the rear end of the blade adapted to be engaged by the tapered face of the recess.

2. A counterbore and spot facer comprising a cylindrical body having an annular head formed on its forward end and a shank on its rear end, said body and head being provided with a diametrically extending blade receiving slot and said body being threaded from the head to a point beyond the slot, a centering and guiding rib at the forward end of said slot having seats on the opposite sides thereof, the rib extending transversely across the slot, a flat blade positioned in said slot and having formed therein a longitudinally extending slot extending substantially the full length thereof for receiving the rib, the slot in the blade defining cutting edges at the forward end of the blade and on the opposite sides of the slot, and a nut threaded on the shank to engage with the rear end of the blade for moving the blade forwardly into engagement with said seats, the adjusting nut having its forward face provided with a tapered recess and tapered shoulder formed on the rear end of the blade adapted to be engaged by said tapered face, said head having an annular tapered shoulder corresponding to the tapered recess of the adjusting nut.

EDWARD A. ZEMPEL.

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