US1014412A - Boring and turning bar and bar-holder. - Google Patents

Description

0. A. PALMGREN.

BORING AND TURNING BAR AND BAR HOLDER.

APPLICATION FILED M1014, 1910.

1,014,412. Patented Jan. 9, 1 912.

16 v 2 Ff7 1 UNITED STATES PATENT OFFICE.

CHARLES A. PALMGREN,

To all whom it may concern:

Be it known that I, CHARLES A. PALM- GREN, a resident of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Boring and Turning Bars and Bar-Holders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a view showing an end elevation of an attachment embodying my invention applied to a lathe; Fig. 2 is a. side elevation of the attachment; Fig. 3 is a plan view of the same partly in section; and Fig. 4 1s a section on the line IVIV of Fig. 3; Fig. 5 is a detail view similar to the left hand end of Fig. 3, showing the sleeve reversed to secure a tool at right angles to the boring bar.

My invention is designed to provide a boring bar and holder of improved character which can be readily attached to lathes; which can be readily and quickly adjusted; which can be used with tools of varying forms; and which can be attached to lathes in such a manner as to insure great firmness and rigidity.

A further object of my invent-ion is to provide a boring bar of this character which can be used to equal advantage for turning; which can be made in any desired size to suit different sizes of lathe on the market;

and which will permit the tools to be readily changed to make either an outside or an inside cut.

In the accompanying drawings, the numeral 2 designates a lathe bed having therein the usual guide 3, on which is mounted the slide rest 4, having the usual feed devices 5. The slide rest is provided in its upper face with a T-groove 6, by means of which my improved attachment is secured thereto.

7 designates the bar holder which is of segmental form with a concave upper edge 8 and a convex lower edge 9, the latter having a concave bearing in the upper face of a block 10, which is seated on the slide rest 4. The holder is secured to the slide rest, preferably by means of two bolts 11, having two different size heads at their lower ends which engage the T-slot 6, which may be of two sizes, of the slide rest, and which extend upwardly through the block 10, and through the holder 7, being secured by nuts 12 at their upper ends wit-h convex face washers 13 interposed between the nuts Specification of letters Patent.

OF CHICAGO, ILLINOIS.

BORING AND TURNING BAR AND BAR-HOLDER.

Patented J an. 9, 1912.

Application filed December 24, 1910. Serial- No. 599,141.

and the concave upper edge 8 of the holder. The holes in the holder for these bolts are slotted, as shown at 11, in order to permit of the necessary range of adjustment of the holder. The forward end portion of the holder is formed with a split sleeve portion 14, having clamping lugs 15, and tightening screws 16. The sleeve portion being located approximately central of the edge portions 8 and 9.

17 is the sleeve of the boring bar, which is adjustably secured in the sleeve portion of the holder by means of the clamping lugs 15, and screws 16, and which is open at, both ends and slotted at both ends for the reception of the cutting tool.

18 is a bar extending longitudinally through the sleeve and which is prevented from rotating therein by means of a swivel clamping jaw at its front end. The front or cutting end portion of the sleeve 17 is slotted back from its forward end at opposite sides, as shown at 20, the rear walls of these slots being inclined or beveled, as indicated at 21, to form clamping seats for the tool 22. The forward end portion of the bar 18 also has a slot 23, extending diametrically therethrough to receive the tool 22 and also the clamping jaw 24. This clamping jaw has a convex face 25 and also has a straight clamping face 26, to clamp the tool.- The jaw 24 is loosely seated in the slot of the bar 18 by means of the transverse pin 27. The rear end portion ofthe bar 18 projects beyond the end of the sleeve 17, and is threaded to receive anut 28 having a lever handle extension 29.

The clamping jaw arrangement 24 prevents rotation of the bar 18, whereby when the nut 28 is screwed up and is turned by means of the lever handle, the bar 18 will be moved endwise to either clamp or release the tool, the tool being clamped between the face 26 of the jaw 24 and the inclined walls 21 of the slot 20. I I

Vertical adjustment of the bar may be quickly and rapidly effected by slacking the nuts 12. The attachment during this adjustment is at all times parallel to the bed of the lathe, thereby doing away with any tilting movement and insuring at all times a perfect and true cutting bore, without readjusting the tool in the holder. By means of the two bolts 11, the attachment is securely held to the lathe with great firmness and rigidity, being much superior in this respect to securing the bar in a tool post. The construction enables the operator to at anytime make quick changes. It will be further noted that there are no screw clamps which can be tightened by the cutting actlon of the tool, thereby making it difficult to remove the tool. Itwill also be noted that the bar is equally adapted for use either in borin or turning; the ball joint connection 0 the holder provides means for insuring rapid and accurate inside work; any suitable piece of steel can be'u'sed as a cutting tool without special blacksmith or machinework to fit it, other than the grinding of the proper cutting edge; the tool can be changed from an outside to an inside out by simply reversing it in the holder; and the holder will hold any boring tool either round, square or hexagonal. The bar holder may be made of any size required to suit the particular lathe.

I preferably also.

ing substantially vertical walls '31. By these provisions, I enable the sleeve to be reversed end for end with respect to the rod, so that the tool may be held in a straight position, instead of inclined, as shown in Fig. 3, the tool in this case being clamped between the jaw 24: and the straight walls 31 of the'slots 30. The'jaw 24 beingpivoted, is enabled to adjust itself to the surface of the tool and thus provide a rigid and secure clamp.

It will ,be obvious that various changes rest by engagement with the concaved face .my hand.

and also to hold it in different adjusted positions on said bearing, and a boring bar intermediate of said faces; substantially as described.

.2. The combination with a lathe slide rest, of a bearing piece seated on the slide rovide the opposite end of the sleeve 17 with tool slots 30, havrality of securing bolts engaging rest and passing upwardly through said rest and having a concaved bearing surface,

-a tool bar holder having aportion of segmental form provided with concaved and convexed faces, the convexed face adjustably engaging said bearing ,surface the slide piece and through. slots'in the holder, and having clampin means at their upper ends engaging the concaved face, and a sleeve at one end of the tool bar holder having its axis intermediate of the-concaved and convexed faces thereof; substantially as described.

3. A boring bar c0 prising a sleeve having slots at its end, a ar xtending longitudinally through said slee e.and having a slotted end portion, a tol holding jaw pivoted thereto and within the slotted end .portion of the bar and extending into the slots of the sleeve, and means for effecting a longitudinal movement of the bar within the sleeve to clamp the tool between the jaw and the sleeve; substantially as described.

4. The combination with a lathe slide rest, of a bearing piece seated on the slide rest and having a concaved bearing surface, a tool bar holder having a portionof segmental form provided with concaved and convexed surfaces, the convexed surface engaging said bearing surface, the radius of a plusaid surfaces being such that the tool bar holder is within a circle which is coincident.

with said surfaces; substantially as de-.

scribed.

5 The combination with a lathe slide rest, of a bearing piece seating on the rest and having a concaved bearing surface, a tool bar holder having a portion of segmental form provided with a convexed surface, the convexed surface on the tool bar holder engaging the concaved bearing surface on thebearing face, the radii of said surfaces being such that the tool bar holder is within the circle which is coincident with said surfaces; substantially as described.

In testimony whereof, I have hereunto set 0. A. PALMGRE-N.

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