US1816209A - Chuck operating mechanism for machine tools - Google Patents

Description

July 1931. E. P. BURRELL ETAL 1,816,209

CHUCK OPERATING MECHANISM FOR "ACHINE TOOLS Filed April 10. 1928 9 Sheets-Sheet l 311061113113 Wflwa I R 7 WWW.

July 28, 1931. E. P. BURRELL ETAL 1,816,209

CHUCK OPERATING MECHANISM FOR MACHINE TOOLS Filed April 10, 1928 9 Sheets-Sheet 2 July 28, 1931. E. P. BURRELL ETAL I 1,316,209

CHUCK OPERATING MECHANISM FOR MACHINE TdOLS Filed April 10. 1928 9 Sheets-Sheet a July 28, 1931. v E. PL BURRELL E-TAL 1,816,209

CHUCK OPERATING MECHANISM FOR MACHINE TOOLS n I k I I' L w I I m I v I Y .l l, I I a gwueptoz WKM y 8. 1931. E. P. BURRELL ET AL 1,815,209

CHUCK OPERATING MECHANISM FOR MACHINE TOOLS Filed April 10. 1928 9 Sheets-Sheet s N K k. g g

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' (Q g N "i g n 6 k v gwwntoz $6 7211i #6 MT mmmv July 28, 1931. E. P. BURRELL ET AL 1,316,209

CHUCK OPERATING MECHANISM FOR MACHINE TOOLS Filed April 10, 1928 QSheets-Sheet 6 a if r s I f i ,I 11km l1 \\\\x\\m\\\\ July 28, 1931. v E. P. BURRELL ET AL CHUCK OPERATING MECHANISM FOR MACHINE TOOLS Filed April 10. 1923 9 Sheets-Sheet 7 'G mleniors Wav /wk &4 R I w M M July 28, 1931. E. P. BURRELL ETAL. 0

CHUCK OPERATING MECHANISM FOR MACHI I IE TOOLS Filed April 10, 1928 9 Sheets-Sheet 8 Jrwen tors Mwwvf gz July 28, 1931. E. P. BURRELL ET AL 1,316,209

I CHUCK OPERATING MECHANISM FOR MACHINE TOOLS Filed April 10, 1928 9 Sheets-Sheet 9 l atented July 28, 1931 UNITED STA TES PATENT OFFICE EDWARD P. BURRELL AND FRED nnocumm, or CLEVELAND HEIGHTS, OHIO, ASSIG-NOES TO THE WARNER-a SWASEY COMPANY, or CLEVELAND, OHIO, A CORPORATION OF OHIO Application filed April 10,

This invention relates to power operated mechanism for closing and opening chucks which are adapted to grip work pieces while the same are being machined; The present invention, while applicable to chucks generally, has particular advantages in connection with largechucks, the closing and opening of which require a great amount of powerand which can be closed and opened manually only with great difficulty and with a considerable loss of time. f

The principal object of the present invention is tofprovide a power operated chuck closing mechanism by whichfthe chuck may be closed and opened quickly and safely.

A further object is to provide a mechanism of this character by which the movement of the chuck operating member, whether in the form of a wrench or pinion, into and out of engagement with the chuck as well as the rotation of this member are controlled by a single controlling lever which is capable of movements of difi'erent kinds or indifferent directions to effect successively, first, the engagement of the-member with the chuck and then its rotation in the closing or opening operation andthen the stopping of this member and thewithdrawal of it from the chuck.

-A furtherobject is to provide an efiective form of interlock between the controlling lever above referred to and the'controlling lever for the chuck rotating mechanism so that it will be impossible either to engage the rotary endwise movable chuck opening and closing member with the, chuck while the latter is in rotation and also impossible to start the chuck into rotation while itis engaged with said member.

An additional object is to provide a control mechanism for the chuck closing and opening member,-this mechanism being so arranged and constructed that it will be impossible to start the rotation of this member untilit is in full engagement with the part or parts of the chuck which the member is adapted to engage and actuate.

Still further'the invention aims to provide an automatic brake for the chuck with an operative connection between it and the control lever for the chuck rotating mecha-' nism such that a brake is released when the CHUCK OPERATING MECHANISM FOR MACHINE TOOLS 1528. Serial No. 268,911.

control lever is moved from its neutral or inoperative position in either direction to o1 )-erat1ve position controlling the rotation of the chuck in one direction or the other, and, further, so that the brake is automatically applied when the control lever is moved from either of its operative positions to or toward neutral position. I

Still further the invention aims to provide an effective combination between the con trol lever. for the chuck driving mechanism, the control lever for the chuck closing and. opening mechanism and this brake by which the interlock between the two levers is obtained and by which the brake is released or automatically applied when the control lever for the chuck driving mechanism is shifted. The above and other objects are attained by the present invention which may be here briefly summarized as consisting in certain novel combinations and arrangements of, parts and details of construction which will be described in the specification and set forth in the appended claims.

In the accompanying'sheets of'drawings we have shown one embodiment of the invention wherein the mechanism involved in the invention is the form of an attachment to the headstock and bed of a lathe, the power for operating the chuck closing and opening member being'obtained from the headstock and in this instance being connected to one of the gears utilized in rotating the work spindle and chuck. However, the invention -may be used to advantage on other types of machine tools and is not necessarily connected to or operated by the power means for rotating the work spindle, nor is it necessary that the mechanism be in the form of an attachment to a machine tool as it may be built into the same soas to form an integral or permanent part thereof.

In the accompanying sheets of drawings, Fig. 1 is aside elevation of the head and chuck to which the mechanism is applied andshowing a portion of the bed; Fig. 2 is a view of the same looking toward the front of the chuck, the bed being in section; Fig. 3 is a plan view of the mechanism shown in Fig. 1; Fig. 4 is a View partly in elevation but prinfor gripping work pieces.

cipally in section along theline l l of Fi 3; Fig. 5 a view of the machine and mechanism shown in the preceding views but looking towardL the head from the rear side of the machine, parts being in elevation but the major portion in section the line 55 of Fig. .3; Fig. 6 is a fragmentary sectional view substantially along the line 66 of Fig. ft; Fig. 7 is a similar view showing a modification in l. in the chuck closing and opening member; Fig. 8 is a view partly in plan and partly in horizontal section she-i detach-ed the con trol mechanism for the cruck operating member; Fi 9 is a side elevation of the same with parts in section, the main control lever being in one of its operative positions and i thc actu tion of the conthereby prevcutins trol mcchai. for the ch lCl-i clos ng and opening memoer; Fl i0 is a view looking toward the left of F 8 with parts in. section and showing' portion of the attachment not shown in Fig, Q; Fig. 11 1S 4. other a fragmentary *cw of a part of the control mechanism li fated in Fig. 9 torshow the parts in a di' position than in Fig. 9, this view showi the main control lever in its central or neural position. permitting the operation of the control meehanismforthe chuck closing and posing device; F] 12 is an enlarged plan View showing a portion of the mechan sm illi ted in Fig; 8, this view indicatiz" 7 f ill 1 and by dotted. lines several p. th contr hanisi' and opening n'uinher; 13 is View sh owing the support or the main control lever and certain portions whi view lookin steward the head; of the machine in front of it emoved nd \Vle'll he i showing d=iagra1nma'cthe mechani m b from --iistrati-n r particularly wh.

rotary work spindle to the forward end of which is applied a work holding chuck 23 adapted to support the work wl it is being machined. The work holding member need not be in the form. of what k,

chuck, but for the sake of brevity and con.-

venience of (T cription, thr ughout the specification, it Wlll be referred to as a chuck.

Generally, however, the work holding memher is in the form of a chuck which may be of standard form or it may be special chuck In either event,

form of the chuck and w n forming a aart of l e for the chuck closing ch it operates, this section: and F 1.4]: a.

we have a of the bed of a lathe of which mounted the;

is generally known as a it generally has work gripping jaws which are radially movable.

Regardless of whether a special or standard form of chuck is employed, the body of the chuck is preferably surrounded by a stiff annulus 24 which may be in the form of a casting, which preferably supported on and clamped to the ways of the bed, as best shown in Fig. 2. This annulus forms a support for themajor portion of the mechanism constitutingthe present invention.

in Fig (3 whore-in we have shown special form of chuck, the innerpart of the annulus 24 is arranged closely between two flanges 25 of the chuck body, there being a slight clearancebetween the inner periphery of the annulus and the corresponding surface of the chuck body, the chuck having no supporting DIQCl to a part of a rotary and endwise-mov- ,se movementmovingare in the positions shown in Fig. 6, these ts are in their normal moperatwe posiand chuck body so that the latter may be rotated without 1nterference by the gear.

It will be understood that each set of aws.

26 is moved by one set of wedges adapted. to be shifted by one of the scrolls, one set of wedges being adapted to slide in one direction, while the other of wedges is adapted to'slide in the opposite direction, the twosets being THOFGCl in opposite directions by the two oppositely rotated scrolls, as more fully described in a prior application Serial No. 229; S96. filed October 31, 1927.

In Fig. 7 wehave shown a standard form of chuck wherein the chuck body 23a has one set of radially movable jaws 26a Wiich are moved in. the well-known manner by a scroll indicated at 2864, this scroll being rotated by any one of a series of pinions 28b, arrange-d an equal distance apart about the periphery of the chuck body. Each pinion has a squared socket adapted to be engaged by the chuck operating: member here in the form of a wrench 29a which is carried by the rotary and endwise movable shafts 3064 similar to that shown in Fig. 6. The wrench 29a is shown in 7 withdrawn from the pinion 28b-so that the chuck is free to rotate without interference by the wrench.

has two sets of jaws or work.

opposite directions, this gear 29 being gear 29 into and out of engagement with: scrolls. lVhen the shaft 30-and the gearus, the gear then being clear of the scrolls may be employed with the mechanism con stituting the subject matter of the present invention.

The work spindle 22 and, therefore, the

chuck are adapted to be rotated by a train ofmechanismcontained in the housing 31 of the headstock and this mechanism may be driven by any suitable source ofv power such as a motor or a belt pulley 32, indicated in Fig. 14, which may be rotated at a constant speed not only to operate the work spindle but also to actuate the tool carrying members which will be supported on the bed in the usual or well-knownmanner.

The endwise and rotatable shaft which carries the chuck closing and opening member, such as the gear 2901 the wrench 29a, is

'in this instance arranged laterally ,of the chuck and substantially horizontally on the rear side of the chuck or on the rear side of the lathe, assuming that the chuck is applied to the work spindle of a lathe." This arrange ment of the shaft and of the-mechanism for actuating it on the rear side of the machine rather ahan onthe front or on the top of the machine has the important advantage that it leaves the front and the top portions of the machine substantially clear of this mechanism so that it does not interfere with other working parts of the machine, such as a motor or other attachments.

The shaft 30 carrying the chuck operating 1 member is supported along with other mechanism in a casing 33 which is bolted to a pad on the rear side of the annulus 24 as very clearly illustrated'in Figs. Qand 4. This shaft is adapted to be shifted in an endwise direction by .mechanism to be referred to presently and it is adapted to be rotated in both directions, one dlrection of rotation being for shifting the jaws or work gripping means into engagement with the work piece and the other for shifting the work "ripping means in the opposite direction away from the work piece. In this instance, the power for rotating the shaft 30 is derived from a gear 34 (see Figs. 13 and 14) forming one of the spindle driving gears of the headstock, this being a constant speed gear which is rotated long as the pulley 32 is rotated or as long as the equivalent of the pulley' such as the motor is in operation. That is to say, the rotation of the gear 34 is unaffected by the stopping of the work spindle, which is controlled by a clutch arranged at a suitable point between this gear and the work spindle. In this instance, power is taken from this gear through the rear side of the. headstock to which is applied a casing 35 supporting two gears 36 and 37, (see Figs. 5, 13 and 14), the latter being an idler gear arranged betweenthe gears 34 and 36. The gear 36 is .mounted on a shaft 38 one end of which is the clutch gear 54.

supported in the casing 35which connected by a'coupling-39: (see Figs. 5 and 14) to a shaft 40 which'is supported by a housing 41 which is secured to the side of the housing 33 which, as before stated, supports the shaft 30 and is secured to the rear sideof the annulus 24. This shaft 40 is connected by three gears 42, 42a and 42b to a shaft 43 extending into the housing 33, the said gears being of a variable ratio to suit different driving speeds of the chuck operating member and being of variable diameters to permit different displacements of shafts 40 and 43 to accommodate chucksof different sizes and to admit of the unit, including the housing 33, to be moved inward or outward in accordance with the size of the chuck.

The shaft 43 is provided on its inner end within the housing 33 with a bevel pinion 44 which meshes with a bevel gear 45 forming one element of a slipping clutch which is clearly illustrated in Figs. 4 and 14. This slipping clutch is arranged on a shaft 46 and consists, in addition to the bevel gear 45 which may rotate freely on shaft 46, of a friction clutch member 47 which is held in engagement with the gear 45 under predetermined pressure by a coil spring 48 surrounding a portion of the shaft 46 and engaging an {H-- justable abutment in tile form of a nut 49 secured onto snaft 46, the clutch member 47 being keyed to shaft 46 but slidable thereon. This slipping clutch located in the drive be tween the headstock and the shaft carrying On shaft 46 is provided a pinion 50 enif gaging a wide faced pinion 51 on a shaft 52 supported by the housing 33. From this pinion and shaft 52 power is transmitted to shaft its 30 to rotate the same in opposite directions through two clutch gears 53 and 54 which are supported in the housing 33, and have sleeve-like extensions which form supports for shaft 30. The drive takes place direct from pinion 51 to clutch gear 53 to rotate I the shaft 30 in one direction and the drive from pinion 51 to clutch gear 54 for rotating shaft 30 is through two idler gears 55 and 56 (see Fig. 14) on a shaft 57 also supported by the housing 33, the idler gear 56 engaging Either clutch gear 53 or to the shaft 30 by a movable clutch member 57 which is splined to shaft 30 so as to r0- tate therewith and is adapted to be shifted lengthwise thereof between the clutch gears 54 may be clutched 53 and 54 by a shifting lever 58 (see Figs. 4 and 10), which is operated as will be explained presently. It might be here stated.

that the clutch gears and the opposite ends of the clutch member 57 are provided with clutch teeth which come into engagement so as to transmit mo ion from one or the other of the clutch gears to the clutch member 57, the teeth being spaced apart so that a hammer blow va'i" be imparted to the clutch member and therefore to the shaft 30, this being of especial importance in the opening operation, and it is useful. also in the closing operation when an exceptionally strong gripping is desired.

The shaft 30 is adapted to be moved in an endwise direction, in which event it slides through the clutch gears 53 and 54 and movable clutch meml'ier 57, by means of a shifting lever 59 (see Figs. 4;, 6 and 7) having shoes engaging a shoe ring 60 formed on the shaft. The manner in which this lever 59 is controlled and shifted will also be e plamcd presently.

The main control lever which controls the rotation of the work spindle and chuck in the lever is shown in its neutral position, and

to cause the work spindle and chuck to be rotated in one direction it is swung from neutral position. in one direction and vice versa. T is main control lever controls a main control clutch including a movable clutch member designated by the reference character 62 in Fig. 1%, which clutch memher is shown on a. clutch shifting member 6264 provided with a shoe ring 62?) which is adapted to be moved back and forth by a lever 628 (see Fig. 13) the main control lever is rocked. This lever is connected to a vertical rock shaft 62d to which the main control lever 61 is connected. This clutch member 62 is adapted to clutch either of two gears 63 and 64. to a shaft 65, the gears 63 and (54 being rotated in opposite direc tions by the constant speed gear 34: through gears 34a, indicated in Fig. 14. In this instance the shaft 65 carries a sliding gear cone 66 by which any one of a plurality of speeds may be imparted to the work spindle which provided with gears adapted to engage the ears of the cone. It will be understood t ntv we have not attempted to hi dicate all of the gears and shafting employed in the usual headstock but the showing of Fig. 1 will indicate a suitable driving connection between the main source of power, in this case the pull y 32, and the work spindle for rotating the latter and the chuck in opposite directions.

The chuck closing andopening mechanism is controlled by a lever 67 which is also on the front side of the machine and which, like the lever 61, is supported on the top of the headstock. This lever 67 is capable of two distinct movements, one being a swinging movement in. plane at right angles to the axis of the machine and the other being a rockin'g'movement in a plane parallel to the axis of the machine. The functions of these movements will be explained presently.

For the swinging movement, this lever is pivoted at 68 on a bracket 69 which is, capable of rotating to permit the rocking movement of the lever. This bracket 69 is rotatahly supported on the substantially tubular portion 70 of a support 71 which is attached to the top of the headstock, this support consisting of an irregularly shaped casting" as will be seen from Figs. 8 and 9. The upper end of the lever 67 is pivoted to a sea-ft 72 which is given an endwise movement when the lever 67 is swun on the pivo tal 6S and is given a rocking movement when the lever is rocked by rotating the bracket This shaft extends across the top of the headstock and at its rear end it provided with a pinion 73. and just forwardly of the pinion it is provided wi'h an.- nular teeth or a circular rack 7 i. l i hen the lever 67 is swung from neutral position outwardly, the shaft 72 moves inwardly and the effect of this is first to rock a bell-crank 75 having at one end teeth engagine the circular rack 7 4 and the movement or this bell-crank shifts a rack 76. The second and laer effect of the rearward movement of ft 72 to move the pinion into further engagement with a second rack 77. These two racks are supported in horizontal position, in the rear end of the supporting; memb r 71 (see Fig. 8) and in an upwardly projecting member 38a forming an extension of the housing i i/ hen the rack 76 is shifted, it rocks a lever 78 which is fixed to the top of a vertical shaft 7 9 8) contained within a portion of the housing 33 and provided near its lower end with the lever 59 (see Figs. (5 and 7) which is utilized in shifting shaft 30 in. an endwise direction to bring the chuck operating member into or out of engagement with the jaw shifting part or parts of the chuck. The function of the pinion 73 which is at all times in mesh with the second rack 77 is to shift the clutch member 57' the pinion being rotated by rocking the lever 67 and bracket 69 thus turning the shaft 7:2 and the pinion Tl 30 is rotated depends upon the direction in;

rotate.

which the clutch member 57 isshifted, and, as will be apparent,the clutch member may be caused toengage either clutch gear 53 r .54, depending upon the direction inwhich the rack 77 is shifted, and this in turn depends upon the direction in which the control lever 67 is rocked.

It is of vital importance in order that breakage may be avoided, that the chuck closing, and opening member be in full engagement with the j aw shifting part of parts of the chuck before this member is permitted to Accordingly, it is important and vital to the success of'the power operated chuck closing and opening mechanism that the shaft 30 be given its full endwise movement to engage the chuck operating member with the jaw shifting member or members of the chuck before the shaft is rotated and that it be held in the engaged position and be prevented from accidentally or otherwise being moved out of engagement while the shaft is being rotated in either direction.

This makes necessary the provision of means for requiring the full swinging movement of the control lever 67 away from neutral position before it can be rocked in either direction, and after the chuck has been closed, the completion of the rocking movement to place the clutch member 57 in neutral position before shaft 30 is retracted. This is accomplished in a simple but very effective manner by providing on the endwise movable and rocking shaft 72 a pin 82 which engages in a T-slot 83 formed in a portion of the support 71. When the control lever 67 is in neutral position, the pin occupies the position in the slot shown in Figs. 3, 8 and 12 being at the front end of that portion of the slot which stands transversely to the axis of the machine.- When thelever 67 is swung outwardly its full distance this pin is brought into line with that portion of the slot which extends longitudinally of the axis of the machine, and, accordingly, when the pin occupies this position and not until then can the lever be rockedto cause the shaft 30 to be rotated in one direction or the other, the pin being shown in this position in Fig. 11 and in Fig. 12 at 82a where'its position at such time is shown by dotted lines. When the pin has been moved to position 82a by the endwise movement of the shaft 73 result ing in the endwise movement of shaft 30 to cause the engagement of the chuck operating member with the chuck, it (the pin) may then be moved to either end of the slot to position 825 or 820 shown in Fig. 12, when shaft 7 2 is rocked to engage the clutch mem- 0 her 57 with one or the other of the clutch gears 53 and 54, it being understood that when the pin is in position 82?), the clutch member 57 is in engagement with one, clutch gear and when it is in position 820, the clutch member is in engagement with the "other clutch gear. It follows also that afterthe chuck has been closed or opened the pin must be brought back into alignment with the transversely extending portion of the slot resulting in the disengagement of the clutch member 57 from the clutch gear which it previously engaged and then the pin may be moved forward to its normal position which is done by swinging the control lever forwardly to its normal position indicated in Fig. 9. v

When the control lever 67 is in. its normal inoperative position, it is highly desirable that the clutch member 57 be maintained in its neutral position and that it be prevented from shifting accidentally or otherwise into engagement with either of the clutchv gears 53 or 54. This desirable feature is attained by our construction because of the constant engagement of the pinion 7 3 with the teeth of the rack 77 for the reason that the shaft 73 is held fronrrotating by the engagement of the pin 82 with the transverse portion of the T-slot 83 (the clutch member 57 at such mechanism a brake for checking the rotation of the work spindle and chuck as soon as the lever 61 is thrown from either opera- ,tive position to neutral position thus permitting the operator to open the chuck by operating the control lever as soon as a wor piece has been completed, thereby'avoiding loss of time which would otherwise be caused by the inertia of the rotating parts. Additionally, we provide for the automatic application of the brake and for the disengagement of the brake member from the chuck by the mere throwing of the lever 61, and we also provide an interlock between the main control lever 61 and the lever 67 which controls the chuck closing and opening mechanism sothat it will be impossible for the operator to attempt to open or close the chuck by inserting the chuck operating member on shaft 30 into the chuck while the chuck is ro tating, and also impossible for the operator to start the work spindle and chuck in rotation when the chuck operating member is engaged with the chuck either during the chuck closing or opening operation. Thus liability of breakage is avoided. In the accomplishment of these ends there is provided in the supporting member 71 a horizontally arranged shaft 84 on which is mounted for slight rocking movement a wide faced lever toward the front side of the machine. Addidescribed above, we have provided as a part of our improved" tionally there is pinned or otherwise secured to this shaft a collar 89 l living forwardly projecting tongue 87 which is adapted to engage the lower end of an adjustable set screw 88 which carried by the lever a short distance to wardly of the shaft Additionally, there is pinned or otherwise secured, in till; 'nstance, to one end of shaft 84 a lever 89 whicn extends from the shaft toward the rear side of the niacsiine an i carries a brake shoe 90 which in turn is adapted to engage a grooved portion 91 of the chuck body, his grooved portion being adjacent the rear end, of the chuck as shown in Fig. 3.

The brake shoe is preferably pivotally connected to lever 89 by a pin 92 so tl it may be adjusted to conform to the contour of the shoe engra ing portion 91 of tie chuck body. In this instance the shoe may be rocked aoout the pi- 92 and held in any desired position of adjustment by a pair of set screws 93 extending through the lever and engagi the shoe near its opposite ends. 'lhe brake shoe is normally pressed agal t the shoe engaging portion 91 of the chuck body by means of a spring 94f arranged between tie top of the lever and an adjustable abutment carried by a screw 96 mounted in an ear 97 forming a part of the support 71. lVith this arrangement the action of the spring 94 is to normal ly tend to seat the brake shoe against the shoe engaging portion 91 of the chuck body and at the same time to elevate to its upper most position, the wide faced lever 85 through the medium of the lip 87 and set screw 88. Obviously by adjusting the screw 88 it is possible to adjust the relative positions of the brake shoe lever 89 and the wide faced lever 85. which adjustment may be advisable from time to time as wear on the brake shoe occurs.

It will be observed that thelever 61 may be swung from neutral pos' jiOil shown in Fi 3 in either direction to cause the work spindle and chuck to be rotated in either forward or reverse direction. this swinging movement of the lever taking place betweentwo elevated portions 71a of the supporting mem ber 71 which portions are bridged by a cross plate 98 serving a guide plate for the lever 61. this plate ex h immediately over the lever 61 as lllUStl" in Figs. 1 3 but removed from Fi S, the upper side of the lever being a] imes in contact with the lower face of this plate. The lower side of the lever 61 is given V-shape for a portion of its length, as best shown at 91a. in Figs. 1, 9 and 11, and this l -shaped portion of the under side of the is adapted to engage in a V-shaped notch 99 formen on the up side of the wide faced lever this eng ment taking place only when the lever is in neutral position. It wil be observed that the front end of the wide fac d lever So has an extension 100, one end of which projects over a portion of the T-slot 83 (see Fi 8), which is engaged by the pin 82 carried by the shaft 72 connected with the control lever 67, this extension being preferably in the form of a hardened plate attached to lever 85.

\Vhen the main control lever 61 is in neutral position'so that the V-shaped lower portion 61a thereof is directly in 'line with the slot 99 provided in the wide faced lever 85, the

brake shoe 90 is engaged and the leveris held by the spring 9& in its upwardmost position (see Fig. 11). At this time the extension 100 at the forward end of the lever lies above the pin 82 in the T-slot, this permitting the pin to be moved under it, i. e., permitting free or unrestrained movement of the pin and, therefore, free or unrestrained movement of the control lever 67 for the chuck opening and closing mechanism. When the pin 82 is moved beneath the extension 100 of the wide faced lever 85, as shown in Fig. 11 at 82c, it is obvious that the lever 85 cannot be depressed by movement of the main control lever 61.

lVhen the pin 82 is in its normal position at the forward. end of the T-slot, i. e. out from beneath the extension 100 of the lever 85, and when the main control lever 61 is swung in either direction from neutral position as shown in Figs. 1 and 9, the V-shaped portion or" the lever of course rides out of the "ll-shaped notch 99 of the lever 85 and this cams the lever 85 downwardly, lifting the brake shoe from the shoe engaging portion 91 of the chuck body and it will be apparent that as long as the lever 61 is out of neutral position the brake shoe will be held out of engagement with the shoe engaging portion of the chuck body. lVhen the lever 61 is swung from neutral position, as just explained, thus causing the spindle and chuck to be rotated .in one direction or another (depending .of course upon which direction the main control lever has been swung from neutral position) the extension 100 of the lever 85 is by such movement of the lever cammed downward so asto lie immediately behind the pin 82, as best shown in Fig. 9, so that as long as the lever is out of neutral position it will be impossible for the operatorto shift the control lever 67 to throw into operation the chuck closing and opening mechanism.

As previously stated, ii the pin 82 is beneath the extension of the lever 85, it is impossible for the operator to shiftthe main control lever 61 from neutral position and thus impossible for him to start the work spindle and chuck into operation and to lift the brake from the chuck body as long as the chuck opening and closing mechanism is in operation or as long as the chuck operating member of this mocha nism is in engagement wi h the chuck. In fact, with our improved mechanism it is impossible to shift the main control lever from its neutral position until the chuck operating member on shaft is withdrawn to its normal position in which event the control lever 67 is in neutral position and the pin 82 isin the forwardmost portion of the T-slot. It will be seen therefore that by this mechanism complete safety is provided.

While we have shown the preferred construction, we do not desire to be confined to the precise details shown but aim in our claims to cover all modifications which do not involve a departure from the spirit and scope of our invention.

Having thus described our invention, we claim:

1. A machine tool having a driven member for rotating the work, a driving member for rotating the driven member in opposite directions, a brake for checking the rotation of said driven member and engaging the same, a control member for controlling the rotation of the driving member in both directions and movable in either direction from neutral position, and a a connection between the control member and said brake arranged to cause the brake to be released when the control mem ber is moved from neutral position to operative position in either direction and to be applied when the control member is moved back to neutral position. i

2. In combination with a machine tool having a heacstock containing a spindle adapted to be rotated in either direction, a chuck mounted on the spindle, a brake arranged to engage a portion of the chuck, a control lever v for controlling the rotation of thespindle and movable from normal inoperative position in either direction, and a connection between the control lever and the brake whereby the brake is automatically applied when the control lever is moved to normal position and is released from the chuck when the lever is moved from normal position in either direction.

3. In combination with a machine tool having a headstock provided with a spindle adapted to be rotated in either direction, a lever movable in either direction from normal position to control the rotation of the spindle, a chuck on the spindle, a brake member engageable with a portion of the chuck, and

\ toward and from the work holder. and acontrol member movable in one direction to cause said rotatable member to engage the work holder and movable in another direction to cause its rotation toshift the work engaging means.

5. In combination with a work holder having work engaging means, power means for shifting the work engaging means and including a rotatable member movable into and out of engagement with the work holder, and a control member movable in an endwise direction to cause the engagement of said device with the work holder and rotatable to cause said member to be rotated to actuate the work engaging means.

6. The combination with a work holder having work engaging means, of power means for shifting the work engaging means and including a member rotatable in either direction and movable into and out of engagement with the work holder, and a control member" mounted for movement in an endwise direction to cause said first named member to engage or disengage the work holder and rotatable in either direction to cause said member to be rotated to shift the work engaging means.

7. In combination with a rotatable work holder having work engaging means, a drive for said work holder, a control member for the drive by which the rotation of the work control member movable to shift said rotatable member relative to the work holder and to control its rotation, and an interlock between the two control members.

8. In combination with, a rotatable work holder having work engaging means, a drive for said work holder, a control member for the drive, means for shifting the work engaging means and including a rotatable member movable into and out of engagement with the work holder, a control member for causing said device to be moved relative to the work holder and to be rotated, and an interlock between said control members so as to prevent the engagement between said rotatable member and the work holder unless j the first mentioned control member is in inoperative position. e

9. In combination with a rotatable work holder having work engaging means, a drive for said holder, a control member for the drive having operative and inoperative positions, means for shifting the work engaging means of the work holder and including a rotatable member movableint-o and out of engagement with the work holder, a drive therefor, a control member for controlling both the rotation of said rotatable member and its movement toward and from the work holder, and an III-e terlock between said control members which prevents the operation of the first control the operation oi the unless the first control member is in mop-- member unless the second control member is in neutral position.

for, a cont ol member for controlling both the rotation said rotatable member and movement toward. and from the work holder, and an interlock between said control member which prevents the operation of the first control member unless the second control member is in neutral position and prevents second control member erative position.

11. In combination with a holder having work engaging means, a brake for checking the movement of the work holdor, a drive for the work holder, a control member for said drive and brake, and means for shifting the work engagii'ig means of the work holder and having a control member interconnected with said first named control member.

12. In combination with a rotatable work holder having work engaging means, a power drive for the work holder, a brake for checking the rotation of the work holder, a control member controlling both the power drive and the brake, means for shifting the worker.- gaging means and including a rotatable member movable toward and from the work holder, a control member movable in two directions to control the engagement of said rotatable member with the work holder and also its rotation, and means forming an interlock between said control members.

In combination with a work holder having work engaging means, means for shifting the work engaging means and including a rotatable member movable toward and from the work holder, and a control member at-- ranged so that when firstv moved in an endwise direction it will shift said member into engagement vith the work holder and when then rocked it will cause the rotation of said member.

14. In combination with a work holder having work ens iging means, means for shifting the work engaging insane and including a roe in ember movable towarc from the work holder, a control member movable in an endwise direction to cause said member to be moved into engagement with th work holder and capable of rocking movement to cause said member to be rotated, and means by which the control member i cons: rained to he first moved endwise before being rocked tor the work engaging operation.

Amaciinetooll aviag a bead provided rotatable work with a Work spindle adapted to be provided with a work holder having work engaging means, a drive in said head for the spindle and work holder, and power means for shifting the work engaging means, said power means including driving means and a member arranged laterally 0t and movable substantially horizontally relative to said driving means into and out of engagement with the work holder.

16. Amachine tool having head pr vidcd with a work spindle, a drive for the spindle, a chuck adapted to be applied to the spindle, power means for closing and opening the chuck and including a drive engageable with an element in the head and including also a member movable laterally on the rear side of the head toward and from the periphery of the chuck.

17. The combination with a work holder having work engaging means, means for shifting the work engaging means and including operating member movable to ward and from the work holder and also rotatable, a control member capable of two separate movements, one to cause the operat ing member to be moved into or out of engagement with the work holder and the other to control the rotation of said operating member, and devices between the control member and the operating membe which are separately actuated by the two movements of the control member.

18. In combination with a work holder having work engaging means, means for shifting the work engaging means and including an operating member movable endwise toward and from the work holder and rotatable in either direction, a clutch for controlling its rotation, a control member having two separate movements, a shifting means between said control member and the operating member to cause theendwise movement of the operating member during one movement of the control member, and shifting means between the control member and the clutch to cause the clutch to be shifted during the other movement of the control member.

19. In combination with a work holder having work engaging means, means for shifting the work engaging means and including an operating member movable in an endwise direction toward and from the work holder and rotatable, a clutch for controlling its rotation, a shifter for moving the operat ing member endwisc, control member having two separate movements one for the endwise movement and one to control the rotation of the operating member, and operating means between said control member and the shifter and between said control member and the clutch.

20. In combination with a work holder having work engaging means, means for shifting the work engaging means and including an operatlngmember movable in an endwise direction toward and from the work holder and rotatable, a clutch for controlling its rotation, a shifter for moving the operating member I endwise, a control member havingtwo separate movements one for the endwise movement and one to control the rotation of the operating member, and operating means between said control member and the shifter and between said control member and the clutch, said operating means comprising a pair of racks, one actuated by one movement of thecontrol member and the other actuated by another movement of the control member. "21.111 combinationwith a work holder having work engaging means, means for shifting the work engaging means and including an operating member movable toward and away from the work holder and also rotatable, a shifter for moving the operating member toward and from the work holder, a clutch for controlling the rotation of the operating member, a control member having two separate movements, means for constraining the control member so that the part controlled by one movement is locked against movement until the part controlled by the other movement isshifted.

22. In combination with a work holder having means for engaging a work piece,

means for shifting the work engaging means and including an operating member movable toward and from the work holder and also rotatable, means comprising a control member movable in two directions to cause the operating member to be moved toward or from the work holder and to control its rotation, and means for preventing the movement of the control member in one direction until its movement in the other direction is completed.

23. In combination with a work holder having means for engaging a work piece,

means for shifting the work engaging means and including an operating member capable of a plurality of movements, means comprising a control member for controlling said movements, and means constraining said control member to cause one movement to be completed before another is initiated.

24. In combination with a work holder having means for engaging a work piece, means for shifting the work engaging means and including an operating member movable in different directions, means comprising a control member for controlling said movements, and means for preventing both movements being imparted at the same time to the operating member by the control member.

25. In combination with a work holder having means for en aging a work piece,

' means for shifting the work engaging means and including anoperating member, a shifter for moving the operating member toward having means for engagmg a work piece, I

means for shifting the work engaging means and including an operating member, a shifter for moving the operating member toward and frond the work holder, means comprising a latch for causing the operating member to be rotated, a control member operatively connected with the shifter and clutch, and means for preventing the operation of the clutch until the shifter has been moved to cause the operating member to engage the work holder to'actuate the work engaging means.

27. In combination with a work holder having means for engaging a work piece, means for shifting the work engaging means and including an operating member, a shifter for moving the operating member toward and from. the work holder, means comprising a clutch for causing the operating member to be rotated, a control member operatively connected with the shifter and clutch, and means for preventing the movement of the shifter to L disengage the operating member from the work holder before the clutch has been disengaged.

28. In combination with a work holder having work engaging means, power means for shifting the work engaging means, including an operating member movable into and out of engagement with the work holder and also rotatable, a single control member for controlling both movements of the operating member, a shifter and a clutch for said controlmember operatively connectedwith the control member, and means for preventing the engagement of the clutch when the control member is in inoperative position.

1 29. In combination with a work holder having work engaging means, means for shifting the work gripping means and including'an operating member movable toward a shifter-and a clutch for imparting the movements to the operating member, a control member having two separate movements, one for the shifter and the other for the clutch, a pair of endwise movable members bea control member having two separate movements, one for the shifter and the other for the clutch, a pair of actuating members between the control member and the clutch respectively, and means connecting the control member with one of said actuating members, raid means including a pinion on the control member;

In combination with a Work holder having Work engaging means, means for shiftng the work engaging means and in cluding an operating member movable toward and from the Work holder and also rotatable, a shifter and a clutch for imparting the movements to the operating member, a control member having two separate mover'nents; one for the shifter and the other for the clutch, a pair of actuating member-she tween the control member andthe clutch respectively, and means connecting the control member with one of said actuating members, said means including a rack on the control member.

32; Incombinationwith a Work holder having work engaging means, means for shifting the work engaging means and including an operating'n'iember movable toward and from the W-ork'holdcr and also rotatable, a: shifter -and-a clutch for imparting themovements to the operating member, a-control member hav-' ing two separate movements, one for the shifter and the other for the clutch, a' pair of actu ating members between the control member and the shifter and clutch respectively,

and means connecting the control member with sair'lactuating members, s id means in cluding a circular rack and a pinion on the control member.

33. In combination with a Work holder having means for engaging a Work piece,-

power means for shifting the Work engaging means and including an operating member having a plurality of separate movements, one for engaging the Work holder, and one for actuating the Work engaging means, and a single control member for causing said movementsto be imparted to the operating member.

34. In combination with a Work holder having Work engaging means, means for shifting the work engaging means including an o ierating member having a plurality of separate movements, one for engaging the worilr holder, and one'for' actuating'the work engaging means, and a single member for controlling said movements so as to cause" them'to be imparted successively.

A machine tool having a head provided 4 l with a Work spindle and a drive for the spindle, a chuck on the spindle, power means" for clos'ingand opening the chuck including a member movable laterally on the rear side of the head toward and from the periphery of the chuck and a. control member therefor at the front side of the head.

36. A machine tool having a driven member including a chuck, a driving member for rotating said driven member in opposite directions, a brake for checking the rotation of said driven member and chuck and adapt e to engage said chuck, a control member for controlling the rotation of the driving 11 ember in opposite directions and movable in either direction from neutral position, and a connection between the control member and said brake arranged to cause the brake to be released when the control member is moved from neutral position to operative position in ither direction and to be applied when the control member is moved back to neutral position.

in testimony whereof, We hereunto aflix 0 ar signatures.

EDWALRD BURRELL. FRED H. BOGART.

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