US2205955A - Tool-holding means - Google Patents

Description

June 25, 1940. J. 'r. Hxscocx 2,205,955

Toon nomme mms Filed June 24, 1959 .9 54 59 4 @gli Patented June 25, 1940 UNITED STATES PATENT oFFlCE e f claims.

My invention relates generally to tool-holding means, but more particularly to vtool-holding means such as for example as are used in connection with lathes, planers, or Shapers, and commonly involving an element thereof, a tool post.

While my invention has utility in a considerable number of situations, I have devised it for use more particularly in connection with toolholding means such as are shown in my pending application for United States Letters Patent, Serial No. 192,636, led February 25, 1938.

In those cases where the tool post supports a part, such as a bar-like member, extending at an angle therefrom, and on this bar ls supported, as by a fixture7 a bar or rod arranged alongside of the bar-like member and extending at its opposite end beyond the fixture with a cutting portion on one end as for example as shown in my said pending application. it has been found, in practice, that under certain conditions the bar or rod, as provided, is subjected to objectionable vibration or chatter in the work-cutting operation.

One of my objects is to prevent such chatter or vibration and to accomplish this by a simple and economical form of means.

Where such structures involve the feature of the bar or rod which is held by the fixture, being rotatably supported on the bar-like member, itis desirable not only to provide means which will prevent the vibrating or chattering .of the rod or bar but also to provide for the functioning of such means in the different positions of rotatable adjustment of the rod or bar and by a simple construction and one requiring the minimum of manipulations for the different adjustments.

It is, therefore, another object of my invention to provide the means which prevent chattering or vibration of such construction that itwill be adapted for use where the fixture, carrying the bar or rod, is rotatably adjustable on the bar-like member and which will be of simple construction and require the minimum number of manipulations to condition it for use in the dierent rotatable adjustments referred to.

Still other objects will be manifest from the following description.

Referring to the accompanying drawing in which I have illustrated my invention as applied to the structure illustrated in my said pending application:

Figure 1 is a plan view of tool-holding means embodying my invention, showing one form in which my improvement may be embodied;

Figure 2 is a view in side elevation of the tool equipped rod or bar of the construction;

Figure 3 is a section, taken at the line 3 on FigureV 1 and viewed in the direction of the arrow;

Figure 4 is a plan sectional view, taken at the line 4 on Figure 3 and viewed in the direction of the arrow;

Figure 5 is a fragmentary sectional View, taken at the une 5 on Figure 1 and viewed in the direc- 10 tion of the arrow;

Figure 6 is a view,taken at the line 6 on Figure 1 and viewed in the direction of the arrow;

Figure 7 is a fragmentary plan View of a portion of the structure of Figure 1' showing another 15 embodiment of my invention; and

Figure 8 is an end view of the structure ofFigure 7, the structure being viewed from the right hand side of this gure.

Referring to the construction shown in Figures ,20 1-6, inclusive; it comprises a supporting member 9 of bar-like form, the main body of which is in the form of a flat bar I0, and the end thereof, shown as adapted to receive a tool as hereinafter described, of cylindrical `form, as represented 25 at II.

The member 9 is adapted to be positioned at its bar portion I0 in the `opening in a tool post I2, as commonly provided, as for example in latl'es, the member 9 being secured to the post, as for 30 example by a set screw I3.

In the construction shown, the outer end of the member 9 is adapted to support a tool, such as that shown at I4, for cutting the work, in diierent positions of adjustment. To this end the outer 35 end of the member 9 is recessed to receive the tool between spaced apart stops I5 andy I6, these stops being suiiiciently spaced apart to permitA the tool to be swung from a position in which it extends parallel with the member into any se- 40 lected position on this member either to the right or to the left within the limits of the stops I5 and I6. A set screw I1, in the member 9 and screwing in a boss I8 thereon and against the tool l' holds the tool in adjusted position.

The construction shown also comprises a toolholding attachment or fixture, represented generally at I9, and comprising a head structure 20 having two parallel cylindrical openings 2| and 22 extending entirely therethrough. The walls of these openings are split, as represented at 23 and 24, respectively, to form means at which the fixture may be clamped to the cylindrical part II of the bar-like member 9, and mount a member, hereinafter referred to, having a cuttingportion.

The clamping means for the opening 2l comprise a clamp screw which extends through the body of the metal at one side of the slit 23 and screws into the body of the metal at the opposite side of this slit; the clamp for the opening 22 comprising a clamping screw 25 similarly positioned.

The fixture is shown as secured to the cylindrical bar Il of the member 9 to be adjustable thereon into any desired position of angular adjustment about the longitudinal axis of the member 9. The member 9 includes the projecting boss ill, desirable especially to reduce the weight of the tool holder and still afford the desired depth of metal at the threaded connection between it and the set screw I'I, the inner wall of the opening 2l containing a groove 21 extending lengthwise thereof from its right hand end to a point short of its opposite end, this groove opening into an annular groove 29. Thus in applying the fixture I9 to the member 9, it is slid at its groove 2! along the boss I9 until the annular grove 29 registers with this boss, whereupon the `fixture may be freely rotated upon the memberS into any desired position of angular adjustment, the interlock between the wall of the groove 28 and the boss I8 preventing accidental separation of the fixture and member 9 in practically all positions of angular adjustment of the fixture on the member 9.

The cutting-portion equipped member, which is to be held in the opening 22 in the fixture I9 to extend alongside of the member 9, `may be of any desirable form. It may be in the form of a rod or bar 29, preferably angularly adjustable and longitudinally adjustable in the xture I9 and having any desired form of cutting-portion.

The cutting-portion equipped member 29 may be, by way of example, a boring tool (not shown) for boring into the end of work held only by a chuck at its opposite end; or it may be of the general type used in lathes, as shown, the tool proper represented at 39, being shown as supported in a holder rod or bar 3l, secured inthe opening 22 in any desired position of angular and longitudinal adjustment therein; the terminal end of the bar 3! conforming in construction to the terminal end of the bar 9 and providing stop means 32 and 33 for cooperation with the tool l3l), in the different angular positions of the latter as above described, this construction, however, not employing any boss, such as shown at I9, at the place where the set screw for holding the tool member 39 in adjusted position is provided.

As will be understood from the foregoing, the provision of the xture I9, as shown and described, permits it to be angularly adjusted about the axis of the member 9 on which it is supported, to any desired position, and permits of the securing of a tool in the fixture in any desired position of angular adjustment about the axis oi the opening 22, `thereby providing for the adjustment of the tool into any desired position for accomplishing the desired cutting of the work.

The fixture I9 is relatively short compared to the length of the member 29, whereby this member projects at its opposite ends beyond the nxture, and because of such protrusion of the member beyond the fixture, this member is subject to chattering or vibration in the cutting operation.

I have found that such chattering or vibration may be prevented and improved work produced by rigidly connecting the rear end of the member 29 with the bar-like member 9.

Two forms of construction of means for this purpose are shown: in accordance with the showing in Figures 1-6, inclusive, these means comprise a bridging, or connecting, block 34 extending transversely of the members 9 and 29, one end of the block having a notch 35 with a semicylindrical end wall 36 at which the block straddles a clamp screw 31, screwed into the rear end of the member 9. The block 34 is thus adapted t0 be rotatably adjustable on the screw 31 when the latter is loosened and rigidly clamped by the head of the screw to the member 9 upon tightening the screw. The other end of the block 3d contains a cylindrical opening 98 containing a longitudinally split bushing 39 through which the cylindrical member 29 extends. The wall of the opening 98 is split, as shown at 49, and pressure for rigidly clamping the block 3d to the member 29 is exerted by means of a clamp screw M extending through a smooth bore opening 92 in the block at one side of the joint 40 and screwing into a threaded opening 43 in the block at the other side of the joint.

Figures 7 and 8 illustrate a modified form of block for rigidly connecting the rear end of the member 29 to the member 9. In this form of construction the block, shown generally at M, comprises two sepa-rate similar clamp sections 45 and I6 having opposed sets of recesses 4T, d8, 49, and 59 at the joint between these sections; one set being provided to receive a cylindrical stud 5I on the rear end of the member 9, and the other im set to` receive the member 29, a clamp screw 52 being provided to tightly draw the sections 45 and 49 together about the stud 5I and the member 29 and rigidly connect them together. In

this construction it is necessaryto loosen and then tighten a single screw only in the adjusting of the member 29 and the reclarnping thereof in adjusted position.

As will be understood, the blocks, as described,

are readily adapted for the angular adjustment of the member 29 about the member 9 upon the loosening of the clamp screw 3l in the case of the construction shown in Figures 1-6, and the angular adjustment of the member 29 about its longitudinal axis and longitudinal adjustment of w this member in the iixture I9 upon unloosening the clamp screw fil, in the case of this construction; and in the case of the construction shown in Figures '7 and 8, by merely loosening the single clamp screw 52. Figures l-6 and the clamp screw of Figures 'I and 8 are tightened, the blocks are caused to serve as means for rigidly connecting the members 9 and 29 together preventing vibration or chattering of the member 29.

While I have illustrated and described certain embodiments of my invention, I do not wish to be understood intending to limit the invention When the clamp screws of s thereto, as thesame may be variously modified and altered and the invention embodied in other forms of structure, without departing from the spirit of the invention.

I claim:

l. Tool-holding means comprising an element, means for holding said element in projecting position on a tool post, a structure extending at one side o said element and having a part between. its ends at which it is connected with said element, a cutting-portion at one end and a projecting portion at its opposite end extending alongside of said element, and means engaging said element and said projecting portion for rigidly holding said projecting portion to prevent vibration of the latter.

2. Tool-holding means comprising an element, means for holding said element in projecting position on a tool post, a tool xture connected with said element, a bar carried by said fixture and extending alongside of said element and at one end having a cutting-portion, its opposite end projecting beyond said fixture, and means engaging said element and said bar for rigidly holding said bar to prevent vibration of the latter.

3. Tool-holding mea-ns comprising an element, means for holding said element in projecting position on a tool post, a structure extending vat one side of l said element and rotatably adjustable about said element, said structure having a part between its ends at which it is connected with said element, a cutting-portion at one end and a projecting portion at its opposite end extending alongside of said element, and means engaging said element and said projecting portion forr rigidly holding said projecting portion to prevent vibration of the latter, said means being rotatably a-djustable about said element.

4. Tool-holding means comprising an element, means for holding said element in projecting position on a tool post, a structure extending at one side of said element and having a part between its ends at which it is connected with said element, a cutting-portion at one end and a projecting portion at its opposite end extending alongside of said element, and a rigid connecting member having openings therethrough into one of which said projecting portion extends, and clamp devices, one of which extends through the other of said openings, for rigidly securing said member to said element and to said projecting portion.

5. Tool-holding means comprising an element, means for holding said element in projecting position on a tool post, a structure extending at one side of said element and having a part between its ends at which it is connected with said element, a cutting-portion a one end and a projecting portion at its opposite end extending alongside of said element, and a rigid connecting member having a recess opening through an kedge of said member and an opening having a split Wall, said projecting portion extending into said opening, and clamp devices for rigidly clamping said member against said element and clamping said member to said projecting portion, one of said clamp -devices extending into said recess and adapted whenL loosened to permit said member to swing thereon.

6. Tool-holding means comprising an element, means for holding said element in projecting position on a tool post, a structure extending at one side of said element and having a part between its ends at Whichit is connected with said element, a cutting-portion at one end and a projecting portion, at its opposite end extending alongside of said element, and arig'id connecting member formed of sections recessed at their end portions to form, together, openings for receiving said element and said projecting portion, and means clamping said sections against said element and said projecting portion.

JOHN T. HISCOCK.

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