US2516493A - Combination toolholder head - Google Patents

Description

July 25, 1950 Filed Jan. 18, 1947 C. L. WAITE EFAL COMBINATION TOOLHOLDER HEAD 5 Sheets-Sheet 2 ea 4 n @l: 192 .6. a

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July 25, 1950 c, wAlTE ET AL I 2,516,493

COMBINATION TOOLHOLDER HEAD Filed Jan. 18, 1947 f 3 Sheets-Sheet 3 Patented July 25, 1950 COMBINATION TOOLHOLDER Charles L. Waite, Dorchester, and Charles F. Waite, Cambridge, Mass.; said Charles L. Waite assignor to said Charles F. Waite Application January 18, 1947, Serial No. 722,864

1 Claim.

fitted within the, head while the tool-holder and its attached spindle are in rotation.

Also our combination tool-holder head, while primarily intended to be attached to and rotated with a spindle, can be fitted for grinding, boring, or facing on work that is either held stationary or with the work itself revolving.

A further feature consists in the advantage of having the tool-holding element interchangeably fitted in the head to be of any desired length for the feeding capacity of the work desired. Also, interchangeable tools can be readily fitted to and removed from our combination tool-holder head and a quick manual adjustment effected to position the tool relatively with the work and, thereupon, the desired operation commenced and the automatic feed can be thrown into actuation at any time.

A further feature consists in the arrangement and detachment of a grinding wheel or tool with a separate motor to rotate the grinding wheel, and the motor and grinder being belt-actuated, permits the grinder to follow an eccentric grinding path with the belt tight at any time.

For this purpose we provide an adjustable link and means to slide the motor on a suitable car- V rier as the grinding wheel follows its rotative path on the work. Also, the grinder could be centered, if desired, with the spindle on which the tool-head is mounted. Our invention thus enables a standard type of machine with the rotating spindle, such as a milling machine, to be equipped to do grinding, boring, or facing work with an automatic feed on the operating tool.

A further important feature is the novel and improved method of actuating the automatic feed by having a toothed star wheel intermittently rotated by striking against a fixed abutment, so constructed and arranged as to secure a smooth, even, and straight full line contact between the fixed tooth and the star wheel teeth.

Other novel features, combinations, and important advantages will be hereinafter more fully pointed out and claimed.

Referring to the drawings illustrating preferred embodiments of our present invention:

Fig. l is a plan View of our combination toolhead equipped with the grinding wheel and an actuating motor to rotate the grinding wheel independently of the rotation of the'spindle on which the tool-holder head is mounted;

Fig. 2 is a side view of the apparatus as shown in Fig. 1;

Fig. 3 is an enlarged plan view of our combination tool-holder and automatic feed shown mounted on a rotating spindle;

Fig. 4 is a side view;

Fig. 5 is a detailed view illustrating the full line contact between the star wheel teeth and the fixed tooth or abutment imparting a rotative movement and, hence, automatic feeding of the tool-carrying rod;

' Fig. 6 is a further detailed View illustrating a full line separating operation between the star wheel teeth and the fixed abutment;

Fig. 7 is an enlarged detail partly in crosssection illustrating the shaft to hold the grinding wheel;

Fig. 8 is illustrative of a modified form of construction wherein the tool head and arrangement of the abutment for automatic feeding actuation are in separate elements;

Fig. 9 is a cross-sectional view on the line 9-9 of Fig. 8, and v Fig. 10 is an end view looking from the right of Figs. 3 and 4. I

Fig. 11 is a fragmentary side view illustrating a modified form of movable motor mounting.

Referring to the drawings, and particularly Figs. 4, 5, and 6, our combination tool-holder head comprises a block I having a cylindrically bored opening therethru as indicated in dotted lines at 2, with a keyway 3, said head being formed on a tailstock 5 for attachment to a rotating spindle. The tailstock 5 has a bearing shown in dotted lines at 6, Fig. 3, adjacent the tool head to receive a block In having a corresponding bored opening to fit on the bearing 6. A ring I secured to the surface of the bearing by a set screw 8 holds the block it in rotatable position between the ring I and the rear face of the block 1. At one end of the block I0 is fitted the adjustable abutment or tooth to be moved into and out of contacting position with the teeth on the star wheel to actuate the feeding movement, to be described. This adjustable tooth I2 is formed with a cylindrical body portion l4 fitted Within a correspondingly bored opening indicated in dotted lines at l5 and slidable in said bore into and out of operation position.

adjusted either in operative or inoperative posltion.

At the opposite end of the block it, we provide a bored socket 22 and a threaded. cross-opening at right angles to said socket, as indicated at 23,'to

fit a rod or other device in the same to hold the block Ill against rotation on the bearingwhenthe tailstock is attached to a rotating spindle and.

the tool holder is being rotated. A secondbored opening 24 is fitted, as shown, to be simply attached to a-fi'xed' bracketg-if desired.

Adapted to-slide in the cylindrical-opening 2 in the block I'is-a tool-holding cylinder 25 having oneend portion threaded as indicated at '26, and withv tool-holding sockets, he'reinshown a two in number, '2l"-and '2'8,fin-which a cutting ormilling tool maybe fitted. ln the 'socket'fl; the 'i'nnerportion'or shank 'of a tool llll'may'be of suitable size and cross-section to fit snugly-therein; and'same is held in position by a set screw-3| fitted'in'the tapped recess 32. in the axle end of the tool-holder 25, as best shown'inFig. 3'. Thus the tool 30 is fittedv and. locke'dand is'readily removedjand replaced in the cylindrical holder .25.

In'the second tool-holding recess 23, I. prefer to fit a,flangedbearingfi'with the'flange extende i'ng upwardly and thru aU-"shaped opening in theiaceof, the block I extending from approximately the dotted line position 36' tothe opposite edgeh'i'. in the Uesh-aped' opening'in the face of the plug i andis diametrically opposite the key diliadapted to slide'in the'k'eyway 3, shown in dotted lines in Fig. 3..

,Thus. the cylindricaltool-holder 25 is slidingly fittedinthe block I of. our. combination toolholder head, with astrong and rigid bracing construction. The tube c'anbe utilizedt'o also receive the shank ofa tool and same would be held lII-POSiiJiOIL by a relatively long set screw fitted in the end'32 of the cyl'indricalitool-hclder 25,,thebored opening 35! extending thru thewalls of the. tube toimpingeagainst the shank of the tool held therein. Thus, the flanged tube 35" corrst'it'utesaltool-holding element and a bracing ele ment for the longitudinal. movement of the cylindrical tool-holder 25 and also as afstop against thetravel of the cylinder in one directiornviz to the l iinit of theU-shapedlsl0t.38,.shown in dotted lines, Fig. 4..

Wealscl provide means to lock thetool-holder 25in the block I, if desired, by forming atflattened surface as shown in dotted lines,-Fig. l, at M, which is cngaged byv a socket-headedset screw 42 threaded thru a; correspondingly tapped opening in the side of the block iinalignment with. the flattened surface 4]. The inner end ofthis socket set screw 42 mayalso constitute a stop in cooperation with the lengthof-theflattened surface-M to limitthe lengthwisev adjustmentand, hence, the. feeding movement of the tool holder 25 -relatively with the block. Y

"Mountedoathe. threaded portion 26: of the cylindricalitool-holder 25; we providesa 'starwheei 50 with a bevelled f-ace il carrying: indications This flangedtube 35 is adapted to slide thereon for adjustment, see Fig. 3, the outer face of the star wheel having a series of teeth 52 and the inner face constituting a bearing against the end wall 54 of the block I.

To hold the star wheel 56 in bearing and thrusting engagement with the face 54, we provide a pair of. dove-tailed semi-sectional washers 5555 constituting thrust plates attached to a face 54 ofthe block i by counter-sunk screws 5656, see- Fig. 4, the undercut face of the washers 55 being in a sliding fit with the bevel 5|, see Fig. 6. This star 'wheelfill' has a plurality of teeth, here shown as ten in number, which project into the path of engagement with the abutment [2 when the same is moved. in outermost or operative position, via, to the right viewing Figs. 4, 5 and 6. Thus,'with the-tailstock 5 secured to the rotating spindle, and the block it held rigidl against rotation on the tailstock, the block 1 carrying the cylindrical tool-holder 25 and tool 30 will be rotated'at-th'e-speed ofrotation of the tailstock and spindle; hence, the-teeth 52"on the star wheel50 will-strike the abutment i2 and be roated one toothforea'ch revo1ution,'thus feeding forwardly thet'ool holder 25 the distance which the star wheel 55 travels on the threaded porticnzt for the space of the movement of one'tooth.

These teeth-52 are formed on a bevel in the star wheel 50 and; accordingly, weso construct, position, and arrange the fixed tooth or abutment'i-z'to strike these'teeth 52 so as to give a full line contact both' during thetime of contact between the two teeth asthey roll in contact with each other, and a fullline contactat the conclusion' of saidmovementwhen the teeth are separated.

For this purpose the' tooth i2 is set on an angle rel-ativel'y'with the axis of rotation of the star wheel "59 and has its contacting face bevelled to cooperate'withthe bevel of the teeth 52.

In the operation of the apparatus as thus describediia "suitable tco135'is fitted in the socket 21' andthefsetscrew 3i tightened. The abutmentflz'iskept retractedbris retracted by manipulationof the thumb hutifland the star wheel '5Bis rotated by liand' until the'tool 3G'is inapprcximate'de'sired position to operate on theiwork. Thereupon the thumbnut 2!] is moved to'slide the abutment P2 intofth'e path of the teeth 52' of the 'star 'wheeftc and the power turned on for rotatio'nofthe spindle to which the tail stock 5is attached? Asithe'block irotates, the tool 3llwi1l'be swung around the circular arc to Which'it has beenadjiist'ed and will be fed forwardly step-bystep into-the work by the intermittent action of the starwheel' Sii'b'y its successive teeth-'52 striking. against the abutment I 2 until the work is completed.

'Where a short boring or facing operation is desired; the tool can befitted in the tube'35 and the same operation repeated. 'Meanwh'ile, the blockl0 will beheldagainst rotative movement by any suitable attachment secured to the same thru the bored recesses 22, 23, or Hand attached to some fixed part of the worktable, bench; or machine;

"Referring to the separately rotating grinder wheel attachment as illustrated in Figs. 1, 2, and "I, weattach-t'othe block lllby socket set screws thru the bored openings 25 and 24, a bracket 60 formed at one end of a plate 6i, carrying a pair of dovetailed-s lides 52-52 in which a sliding plate-E4 may travel, this plate carrying a motor designated generally at 65. On one end of'the projecting armature'shait 86 of the motor, we

attach a pulley 67 around which a V-Shaped belt 68 is led, which, in turn, is led around a pulley '70 mounted to rotate freely on a bearing 7| carried by a shaft 72. This shaft would project into the head I, being fitted, for example, in the flanged tube 85 on the cylindrical tool holder and would be retained in position thru a set screw or the like in a depression 74 in the end of the shaft '72.

Thus, the pulley 70 would be loosely rotating on the bearing 7| while the shaft 72 would be in fixed position and would be acted upon to be fed forwardly by the action of the star wheel and abutment I2. The shaft 72 has reduced bearings formed thereon, see Fig. 7, to carry ballbearing raceways I4 and I6 assembled within a rotatable circular housing or casing 77, being held, respectively, in position by a nut '78 at one end threaded around a reduced portion of the shaft adjacent the raceway 76, and by a ring nut 79 at the other end threaded into an inner circular threaded opening near the open end of the circular casing T7. The casing has an outstanding flange 80 which may be secured to a corresponding circular flange ill on the pulley '70.

A plurality of set screws 82 arranged peripherally around these flanges unite same. The reduced sections of the shafts '72 are indicated at 83 and 04, and a ring spacer 85 is fitted between the ballbearing raceways as clearly shown in Fig. '7, thus giving a firm bearing and leverage. The bearing '74 would normally have its lower ring contacting directly onto the reduced portion 84 of said shaft; and we prefer to supply a bushing 86' for the inner raceway 86, which bushing has a rim 87 to hold the bearing firmly between the said rim and the nut 78 without binding on the other raceway 84. The casing I7 is formed, preferably, as an integral part with an extending shaft 90, which carries the grinding wheel 9| on its outer end, being threaded or otherwise united thereto in any suitable manner as by a hub threaded into the correspondingly threaded end 92 of the shaft portion 99 and locked by a nut 94 on the outer end, thus binding the grinder 9| in rigid rotation with the shaft 90.

In order to hold the belt 68 in driving relation between the pulley 6'7 on the motor and the pulley '70 on the grinder shaft 90 while the grinder follows its circular arc or path upon the work, we

provide a rigid adjustable belt tightener, comprising telescoping arms 95 and 96 interlocking in the intermediate portions and being bound in adjusted position by a nut 97 on a bolt 98 passing thru slots 9999 in each of the overlapping portions of the arms 95 and 96, see Figs. 1 and 2.

The end of the arm 95 has a hole of suitable diameter to envelope the shaft 65, and the opposite end of the arm 95 has a corresponding hole to enable the arm to encircle the shaft '72. Thus, as the grinder is actuated in its arc, the entire motor 65 may be slid to and fro on the plate 64 in the guide 62 by this rigid link construction and simultaneously keep the belt 68 tight and the grinder rotating.

Referring to Figs. 8 and 9, a modified form is shown wherein the tool head I, with its toolholder and feeding star wheel and connected parts, is formed separately from the block carrying the abutment I2, which latter may be spaced a considerable distance from the head I in order to relieve weight on the supporting shaft. For this purpose, we would make the abutment I2 on a shank of considerable length and would mount the block |00 between collars IM and I02 on the shaft I03. Preferably the collar I0| would be provided with a hollow hub I05 on which the block I00 would fit. The lower part of the block I00 is fitted with a lug I06, to which is attached a brace or bracket |0| by a bolt I08 or a pair of bolts, as indicated in Fig. 8, the bracket extending to the fixed part of the machine or worktable so as to hold the block I00 in non-rotative position on the shaft I03. The abutment I2 may be moved into and out of operative position by the thumb nut I20 and the entire operation is identical to that already described, but it enables us to make two attachments spaced from the end of the shaft which supports both, as will be readily appreciated.

Referring to Fig. 11 illustrating a modified form of movable mounting for the motor 65 and the rigid link connection to hold the belt 68 under desired tension while the grinder follows its 01- bital path, we mount the motor 65 on a pivotal, rocking, or hinged construction. For this purpose we may provide a typical hinge comprising one leaf I23 which is secured to the support 6|, and a second leaf I24 attached to one of the motor r supports, the two leaves being adapted to rock on a pivot pin I25.

Thus the motor 65 may rock back and forth on the pivot I25 while the belt 68 and rigid adjustable link elements and 96 hold the belt 68 under tension and drive the grinder 9| during its orbital path. This modified form of construction is also important as utilizing the weight of the motor 65 bearing against the belt 68 during the adjustment of the link elements 95 and 96.

- Also, this hinge construction or an equivalent swinging movable actuation eliminates the danger of filings, dust, or dirt getting into the slide 62 in the form shown in Fig. 2.

It is also important that the axis of the pulley 67 be considered as the central point for attachment of both the link elements and the belt, the same being herein shown as the shaft of the motor 66, but in case a gear reduction is employed between the motor and the driving belt 67, the axis of the pulley is necessarily concentric in the attachment of both the adjustable link elements 95 and 96 as well as the belt 68, as will be readily appreciated.

We claim:

A combination tool head of the kind described having a sliding tool-holding element adapted to traverse said tool-head within fixed limits, a rotatable member on said slide to effect the sliding movement relatively with the tool head, said rotatable member being held in assembled position by a pair of dovetailed semi-sectional thrust plates removably secured to the head.

CHARLES L. WAITE. CHARLES F. WAITE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,191,813 Mummert et al. July 18, 1916 1,361,686 Conwell Dec. '7, 1920 1,394,836 Jackson Oct. 25, 1921 1,962,951 Conwell June 12, 1934 2,405,748 Johnson Aug. 13, 1946 FOREIGN PATENTS Number Country Date 36,306 Germany Aug. 2'7, 1886

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