US1081470A - Relieving attachment for lathes. - Google Patents

Description

- A. M. SOSA. 'RELIEVING ATTACHMENT FOR LATHES.

APPLICATION FILED MAY 24, 1913.

Patented Dec. 16, 1913.

3 SHEETS-SHEET 1.

A. M. SOSA. RELIEVING ATTACHMENT FOR LATHES. APPLICATION FILED MAY 24, 1913.

3 SHEETS-SHEET 2.

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APPLICATION FILED MAY 24, 1913. 1,081,470.

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AUGUSTUS M. SOSA, OF CINCINNATI, OHIO, ASSIGNOR TO THE AMERICAN TOOL WORKS COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

RELIEVING ATTACHMENT FOR LATHES.

. State of Ohio, have invented a new and Improved Relieving 'Attachment for Lathes,

of which the following specificationis a full disclosure.

This invention deals with mechanisms causing a tool alternately to be advanced into and out of the work in a cycle bearing any desired relation to some other component'or resultant movement of the work relatively to the tool; and it more especially concerns what is known as a relieving attachment used on machine-tools for the purpose of cutting one or more spiral facets in a revolving piece of work.

The. general purpose ofthis invention is to render available a structurally simple and durable mechanism, preferably in the nature of an attachment, conforming to all or as many as desired of the following capacities; (l) for positively moving a cutting tool toward and into the revolving work always at the same station of its revo- -'lutio-n, and then after a definite period, withdrawing it rapidly; v(2) for impositively and rapidly moving such tool toward the revolving work and then positively withdrawing it during a cutting operation, all in a reverse cycle to the aforesaid case; (3) for readily effecting a shift from the one to the other mode of operation; (4). for enabling the direction of relieving to be changed at will without affecting the timing or the length of the stroke; (5) for permitting'the stroke to be varied in length to any extent desired; (6) for affording any desired periodicity or timing of the reciprocations relative to the movement. of the work; (7) for relieving straight, taper or specially contoured work; (8) for progressively retarding or accelerating the cycle in proportion to the general drift or travel of the tool from an inappreciable amount to any desired degree to make cutters having their flutes angling. from zero degrees (straight) to any number of degrees corresponding with any given spiral; (9) for permitting the operations to be corresponded with a reversed direction of rotation of the work; and (10) for enablinga Wiper-cam and edged follower to be used without being subject to mechanical injury or impair- Specification of Letters Patent.

Patented Dec. 16,1913.

Application filed May 24, 1913. Serial No. 769,753.

ment of its timing adjustment, should the operator momentarily 'reverse the rotation of the spindle.

An object confined to the particular embodiment here shown is to avoid the use of plunger mechanism extending through the vertical pivot about which the tool post carrier swivels, while yet enabling the carrier to be swiveled to any desired extent without disturbing the correct timing of the reciprocations.

Other objects will be in part obvious from the annexed drawings and in part indicated in connection therewith by the following analysis of this invention.

This invention accordingly consists in the features of construction, combination of parts, and in the unique relations of the members and in the relativeproportioning and disposition thereof; all as niore completely outlined herein.

To enable others skilled in the art so fully to comprehend the underlying features thereof that they may embody the sameby the numerous modifications in structure and relation contemplated by this invention, drawings depicting apreferred form have rbeen annexed as a part of this disclosure,

throughout all the views, of which-:

Figure 1 is a side elevation of a lathe showing this relieving attachment with the tool-post arranged for transverse. movements.

2 is a top plan of the structure shown by ig. 1 with the tool post, however,

turned at right angles to its former posi tion, showing the parts arranged to relieve in parallelism with the guides of the lathe bed, as in making the end-cam shown secured to the spindle. Fig. 3 is a section through line 33 of Fig. 1, showing how the tool-post carrier is reciprocated by motion transmitted through the axis of its pivot enabling the tool-post to be adjusted into any angle at which it is desired to relieve the work. Fig. 1 is a plan partially in section along line -(L-i of Fig. 3, with the tool-post and its pivoted base removdd, showing the toothed end of the lower hhlf of the transmitting shaft, as well as details of the reciprocating cam. Fig; 5 is a section through line 5 5 of Fig. 3, showing details of thelconstruction ehabling the length of the stroke of the reciprocations to. be adsted to any extent desired without interring with the angle at which the tool post placed. Fig. 6 is a detail showing the U ements connecting the oscillating vertical pivot shaft and the reciprocating tool post.

' thereof and has a geared connection with the spindle, so that the tool post may be moved in synchronism with the revolutionsof the .spindle in any multiple or fractional ratio therewith.

The bed of the lathe is indicated by A and comprises the usual conventional features which need not here be specifically described.

' The means for moving the work through a definite cycle, as for example in-revolving it continuously,'here assumes the well known form of a spindle indicated by B, which is mounted in a suitable head-stock 1, and is adapted to be power-driven as by means of the pulleys 2, either directly or through the back gears 3, thus imparting'a rotation to the face-plate 4, which carries the work,

here instanced as an end-cam 5.

The tool for machining the work 1s of course mounted on a carriage, here indicated by I), which is adapted to be longitudinally propelled through the agenc either of a leadncrew 6 or a splined-sha 't 7 in a suitable may, as by means of a gear train lead-.

ing from the spindle. The foregoing parts" are purely conventional in characteu and' are typical of any machine-tool construction to which my invention may be applied. I

The non-vibrating base 8 is mounted on the carriage proper in any suitable way, as by means of a dove-tailed slide-way and, either automatically or by hand wheel 9, may be fed transversely to the uides'of the lathe bed to cause the tool to relieve taper work, or special contours. The hand wheel also enables the tool to be adjusted to any desirable position near to or' remote from the axis of the spindle when the relieving attachment is used for straight work. .By

moving the carriage D laterally on the guides, its proximity to the face-plate t may also be determined. Extending transversely from the hand-wheel 9 is a shaft 10 that provides screw threads 11, engaging a nut 12 secured to the baseS, so that such base may be adjusted forwardly and rearwardly by hand on the guides 13 provided by the carriage. For enabling automatic transverse journaled in an arm 23,

feeds to take place simultaneously with the lateral travel as well as the relieving reciprocations, as by means of a conventional taper bar, the nut 12 is releasably held by a bolt 12 that passes through a slot in the part 8, and thus enables the'base to be moved independently of the screw 11. This base 8 may also comprise a portion 1 1 which supports a revolving cam actuated from the spindle and also mounts the reciprocating element directly operated by the cam. Thus referring to Fig. 4, it will be seen that two journal boxes 15and 16 rise at the front end of the piece 14, and they constitute journals for a cam shaft 17. It is noteworthy that this shaft is removable so as to enable the cam to be reversed in position'thereon and, to that end, a cap 18 is secured in the end of the journal box 16 and by means of a spring 19 maintains a clutch-sleeve 20 in engagement with the teeth on the adjacent side of the cam or wiper 21 to drive the same positively in one direction, but inoperative to drive it .in the other direction. The

clutch. sleeve 20 is splined to the shaft 17' which latter may be removed by knocking out the taper pin 18' and taking the retaining collar off the end of the shaft. The cam 21, which is loose onthe shaft 17, may now be reversed in position on said shaft. It is to be noted'that this withdrawal of the shaft will not cause a removal of the sleeve 20 as it will still be retained by the flange 20'.

The cam'shaft 17 is positively actuated in all positions of the carriage, or the parts mounted thereon, by some suitable means, as for example,through the motion-transmitting shaft 0 comprising a splined shaft 22, (against axial movement) and extends forwardly through the gear 24 which is driven from the spindle ,gear 25. by means of suitable intermediates 'QGa-ndQT, adapted to be changed to vary the timingv of the reciprocations of the tool post relative to the rotation of the spindle. By

virtue of a splined connection between the shaft 22 and gear 2 1 (forming an extensible joint) the motion is transmitted irrespective of-any movements of the carriage D,'thus enabling the work to be relieved while said carriage is being propelled longitudinally, and'also by reason of the universal joint connection between the bracket 23 and the bearing 15, the tool post may be adjusted transversely of the lathe bed. This splined shaft will, of course, determine theextent of retardation or acceleration of the relieving cycle relative to the revolutions of the work, thus determining whether the flutes relieved are to be straight or spiral. Thus, when the spline in the shaft 22 is straight, then the flutes will be equally straight, since the acceleration will be inappreciable, and it will be'quite obvious that as the spline departs from a straight line, so also will the flutes the ear train to 24, a similar effect may be i ester/b become "correspondingly spiraled. Or, by using a fractional or hunting ratio for ebtained with a straight spline.

Pivote'd 'to the non-vibrating part 14 is a support '28, on which the tool-post carrier is in turn slidably mounted. This intermediate amel orating support or turret 28 is main trained at all times in exact concentricity with the non-vibrating member 14 by means 1 "of a pivot sleeve 29 and, through this sleeve,

theiiotion for vibrating the tool-post sup- ,p'o'rt is transmitted, as will be described.

This intermediate support or turret 28 may be angled and locked in any position by means. of clamp-bolts 30 thereby determining the line of direction in which the toolv is to reciprocate in its relieving operation.

The tool itself is mounted on a conventio'nal post 31, which is carried by the slidable carrier 32, which has opposite guide rails 33 and 34, so as to rovide ample room for them'ovement of tlie parts projecting through the axis of the turret 28. The means enabling a vibrating or reciprocating motion to be transmitted to the tool-post carrier 32 will now be described.

Sl'ida'bly mounted in the non-vibrating base 'or supporting member 14 is a plunger '35,".which is normally urged into one extreme position of its stroke by means of an "expansible sprin 36 that bears at one end an a stud 37 rigid with the part 14-, and at I its other end it bears against the head of a bolt 38 rigid with the vibrating plunger 35, as appears more clearly from Fig. 3. interposed shock-absorbin washer 39 of leather may be used. The p unger is actuated at its forward end 40 by means of a shiftable shoe or follower 41, secured by 1 means of a screw 42 in a vertical position to correspond with anti clockwise rotations of the actuating wiper cam 21 and, also capable of being interchanged in position to correspond with clockwise rotationof the cam 21, by being screwed in a horizontal position as indicated by the dotted lines on Fig. 3. The expansible spring 36 maintains this shoe 41 in contact with the surface of the tripping cam 21' so that, as this cam rotates, the plunger 35 will be correspondingly reciprocated. It will be observed that the cam is of the abruptly acting type (technically a wiper) and the follower has an acute edge, so distinguished from a roller. This enables more precise actions to take place, and yet, .by reason ofthe peculiar ratchet-like mounting of the cam, no breakage will occur should the lathe'be turned backwardly by hand. It is also noteworthy that the clutch teeth connecting the cam to the actuating sleeve 20 are sym.- metrically related to the cam-facets so that regardless of the number of slip-backs of the cam by a reverse rotationofithe spindle,

the correct timing will always be maintained during the forward rotation.

A two-part shaft 43, having its two portions connected by a dog-clutch, carries a rocker-arm 44 on its lower end and this arm is designed to engage the front and rear walls 45 of a slot or seat rovided by the plunger 35, so that the shaft 43 will be rocked in synchronism with the reciprocations of the plunger 35 and to an extent corresponding with the stroke of said plun- "er. g The upper portion of the shaft 43 is connected with an element 46 providing a slideway 46 in which is confined and freely slides a shoe 47, towhich by means of a pin 48 is pivoted a nut 48 throughjwhich is screw threaded a hand-screw 49 operated by a hand wheel 50, and mounted on the tool-post carrier 32 so that by turning the hand screw 49 the initial position of the support 32 relative to the non-reciprocating part 28 may be determined.

It will be perceived that if the shaft 43 rocks through any given angle, then will the length of the stroke of the tool post support 32 depend upon the eccentricity of the axis of the pivot pin of the nut 48 with respect to the axis of the shaft 43. In other words, should the axis of the shoe 47 be concentric with that of the rock shaft 43, then there will be no reciprocation of the tool-post support 32 and, as the two axes are farther and farther separated, 'so also will the length of the stroke of the tool be progressively increased. This invention proposes a means for accomplishing this irrespective of any angle at which the tool post carrier may be set and without requiring complexity of construction.

adjustable laterallv but not longitudinal of the support 32. Thus, the cradle 51, provides wings 52 and 53 which bear against the end of the support 32, and are preferably slotted to reclamping bolts 54 and 55,

enablin the cradle to be rigidly fixed in any one of its adjustable positions. To aid in obtaining" a fine adjustment, a screw 56 is secured to the cradle and projects into screw engagement with a micrometer nut 57 that is journaled in the side wall of the tool support 32. By turning this micrometer nut the cradle may be shifted laterally, thus varying the distance between the axes of the rock shaft 43 and the actuating pivot of the tool post. As shown by Fig. 2, the upper surface of the end of the cradle 51 is gradu Gil ' operating of the relievlng mechanism so that the adjustment may not be shaken loose or disturbed.

Another notable capacity of this structure'is that it enables the tool to he jumped by spring action toward the work followed by a deliberatepositive motion retreat, or conversely, it enables the tool to be deliberately and positively advanced toward the work followed by the backward jump under spring action. This dual capacity is of advantage where different classes of work are to be relieved. Thus, it enables either right or left hand taps to be relievedwithout reversing the direction of rotation of the spin- 'dle; for, the tool will he jumped quickly into the rear of the ta -blade and then withdrawn slowly while re ieving, leaving the tap-blade at its cutting edge. In the ease of,a left-hand tap, assuming the direction of the spindle to be unchanged, the tool will start at the cutting edge of the tap-blade and slowly advance into'the work, and then ultimately snap back into position opposite the cutting edge of the next blade, and so on. For internal relieving, either right or left-handed, a similar adaptability prevails, and in like manner, the tool may be effectively mounted on either side of the axis of the work, and used for either clock-wise or anti-clockwise rotations of the work.

' To reverse the sequence of the cycle of the relieving tool, so that the positive movements take place while the tool is advancing instead of returning, or conversely, it is only necessary to shift the cradle laterally on the 4 tool-post carrier past the zero point, so that the pin actuating the nut will lie on the opposite side of the axis of the vertical rockshaft. The slotted head of said rock-shaft extends in opposite directions to enable this to be done, and as the opposite arms of such head move in opposite directions with re- .spect to the cradle, the latter will have its cycle of operations reversed by thus shifting the actuating pin, so that its positive and impositive strokes will follow in reverse order.

It may here be observed that this apparatus is so designed that it may be used in the ordinary way, whenever it is desired to operate the same by hand, and without dismounting its other adjustments. Thus, by shifting the cradle 51 to its zero or neutral point, its actuating pivot will liecou'ic coaxial with the rock shatt 4- and Ii0,; .re.eipi'ocation will result, even though such rock shaft be in motion, and any hand-tooling may then be done to the extent desired.

on the upper surface of the ad-- in the case of a right-hand tap,

As described thus far, no mention has been made of the provision for enabling the direction of the reciprocating tool carrier to be changed without disturbing thetiming of the strokes, e. altering the points in the cycle at which such strokes begin and end. By the means herein disclosed however, the relieving may be done in any direction while yet enabling the strokes to begin always at the same station in the cycle of movements of the work-actuated by the spindle. For instance, suppose it is desired merely to change the direction of the stroke, but otherwise maintain the same adjustment so as not to disturb the timing. To do this, the attendant will merely loosen bolts 30 and lift up the swivel-block 28 until the upper half of the rock shaft 43 is disengaged from the lower half; this being done only when the plunger 35 is at the end of its stroke to the right. In this position, the head of the against the pin shown in Fig. 5 and indicated by 60. When the upper half of shaft 43 is detached from its lower half, the parts will still be maintained in this position, by reason of the spring-pressed plunger 61.

The tool-post carrier is now brought to the desired angle and then lowered until the teeth engage to lock the upper and lower halves of the rock shaft 43 together, where upon bolts 30 will be tightened, and the parts are now in proper adjustment for further operation; but at the same time maintairiing the timing in the cycle of the rcciprocations.

It will thus be seen that this invention is well adapted to achieve the objects enumerated in the foregoing while yet possessing great structural simplicity and a capacity for meeting all requirements that would'ordinarily arise in connection with the use of a relieving attachment. Although the attachment consists of but few parts, it will. accomplish all the work and meet all the requirements of much more complicated and costly structures. v

l/Vithout further elaboration, the forego ing will so fully reveal the gist of this invention that others can. by applying current knowledge readily adapt it for various applications without omitting certain features that, from the standpoint of the prior art. fairly constitute-essential characteristics of the generic or specific aspects of this invention; and therefore such adaptations should and are intended to be comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed my invention, I claim as new and desire to sccurb Letters Patent of the United States:--

1. A relieving mechanism of the nature disclosed combining a swivel suppoit, a tool post carrier adapted to be reeiprocated.

'shaft containing the slide-way &6 will be thereon in various directions, mechanism for,

reciprocating said carrier in a predetermined cycle of movements, a power transmitting shaft for actuating said mechanism, and adjusting means cooperating with said mechanism for enabling the cycle of movements to be reversed in any direction of reciprocation ofsaid carrier.

2. A relieving mechanism of the nature disclosed combining a swivel support, a tool post carrier mounted thereon, an actuating member arranged coaxially With said support, means for moving said member in a predetermined cycle, and means connecting said member with said carrier whereby the latter may be reciprocated either in direct or reverse relation with said member.

3. A relieving mechanism of the nature disclosed combining a swivel support, a too-l carrier slidably mounted thereon, an actuating shaft coaxially arranged with said support, means for actuating said shaft in a constant cycle, and an adjustable connection between said shaft and said carrier whereby the latter may be reciprocated 1n strokes of any predetermined length, and whereby the cycle of said reciprocations may be reversed.

at. A relieving mechanism of the nature disclosed combining a swivel support, a tool carrier reciprocating thereon, a r ck-shaft mounted on said support, means for rocking sai shaft at a constant rate, and an adjustconnection between said shaft and said carrier adapted to be eccentrically related to said carrier having-a pin entering said slot,

said member being adjustable to bring the axis of said pin to either side of the axis of said shaft.

6. A relieving mechanism of the nature disclosed combining a supporting member, a tool carrier adapted to reciprocate'thereon, a stop limiting the impositive movement of said tool carrier, a spring normally urging said tool carrier in the direction limited by said stop, a wiper adapted to positively move said tool carrier against the resistance of said spring, a shaft on which said wiper is mounted, and a spring-pressed ratchetclutch adapted to transmit motion from said shaft to said wiper in one direction of rotation and unadapted to drive it in the opposite direction of rotation.

7. A relieving mechanism of the nature disclosed combining a longitudinally movable carriage, a memberslidably mounted thereon to-be moved transversely thereto, a camshaft journaled on said member, a swivel block pivoted on said member, a tool carrier slidably mounted on said swivel block, connections receiving intermittent motion directly from said cam-shaft and extending coaxially with said swivel block adapted to reciprocate said tool carrier, and a universal shaft journaled at one end on said carriage and connected with said camshaft.

8. A relieving mechanism of the nature disclosed combining a work-revolving spindle, a guide-bed parallel with the spindle axis, a carriage slidable on said guide-bed, a carriage-propelling train geared to said spindle, a member adjustable transversely on said carriage, an actuated part journaled on said member in parallelism with said guide-bed, a transmission embodying a universal shaft enabling said part to be actudisclosed combining a work-revolving spin-' dle, a guide-bed parallel with the spindle axis, a carriage slidable on said guide-bed, a

carriage-propelling train geared to said spindle, a member ad ustable transversely on said carnage, a shaft ournaled on said member in parallelism with said guide-bed,

an actuating cam mounted on said shaft, a transmission for actuating said shaft from said spindle, a swivel-block pivoted to said member, a tool-carrier slidably mounted on said swivel-block, and means intermittently actuated by and extending from said cam through the axis of said swivel block to said carrier, and adapted to impart a reciprocating motion thereto.

10. A relieving mechanism of the nature disclosed combining a work-revolving spindle, a guide-bed parallel with the spindle axis, a carriage slidable on said guide-bed a carriage-propelling train geared to said spindle, a member slidable transversely on said carriage, a horizontal shaft journaled on said member, a cam having a ratchetmounti-ng on said shaft enabling it to be positively driven in one direction only, a transmission for actuating said shaft, a swivel-block pivoted to said member, a vertical shaft coaxial with said swivel-block and intermittently actuated from said cam, and a tool carrier slidably mounted on said swivel-block and adapted to be reciprocated by said vertical shaft.

11. A relieving mechanism of the nature an actuating shaft arranged transversely to the direction of reciprocation of said carrier, a positive connection between said shaft and said carrier enabling said shaft to recipro cate said carrier positively during both its forward and return strokes, and means for intermittently moving said shaft by alternating positive and impositive movements.

12. A relieving mechanism of the nature disclosed combining a tool. carrier adapted to reciprocate in a predetermined direction,

an actuatingshaft arranged transversely to the direction of reciprocationof said carmet, a posltlve connection between said shaft and said carrier enabling said shaft to reciprocate said carrier positively during both its forward and return strokes, a cam operative intermittently and positively to ac tuate said shaft, and a spring effective to alternate with said cam in impositively actuating said shaft.

with said shaft, and a cam journaled on said member and operative to reciprocate said element against the resistance of said spring.

14:. A relieving mechanism of the nature disclosed combining a supporting member, a tool carrier slidably mounted to be reciprocated on said IilQllllJOl'ytUl element mounted to oscillate about an axis extending transversely to the direction of reciprocation of said carrier. said Oscillatingelement providing a guide-way extending transversely both to the direction of said reciprocation and to said axis and across the latterfan interponent for transmitting motion from said element to said carrier and adjustably mounted on one of the same, said interponent cooperating with said guide-way and adapted to be located at either side of said axis to enable a given stroke of said element to impart a forward or backward. stroke to said tool carrier, and means mounted on one of said last two mentioned parts for adjusting the position of said interponent relatively to said axis.

15. A relieving mechanism of the nature disclosed combining a lower. supporting member, an intermediate block swiveled to said member, an upper tool. carrier slidably mounted on said block and adapted to be reciprpocated thereon, an actuating shaft extendiiig vertically and coaxially through said intermediate block, a part movably mounted on thesaid lower supporting mem her and connected with said shaft periodi} cally to move the same. relatively to said block, an oscillating elementarranged at the, upper end of said shaft and adapted to be.

oscillated thereby about a given axis, said element having a guide-way extended to opposite sides of saidfaxis, and an interponent adjustable along said guide-way to. either side of said axis and cooperating with said tool carrier to reciprocate the same in a direct or reverse cycle.

16. A relieving mechanism of the nature disclosed combining a lower supporting member, an intermediate block swiveled thereto, an upper tool carrier slidably mounted to be reciprocated on said block, an ele-' ment mounted to oscillate about a given axis extending transversely to the direction of reciprocation of said carrier, said oscillating element providing a guide-way extending transversely to'said direction of reciprocation and also extending transversely to and across said axis, an interponent movable with said element and coiiperating with said' guide-way and adjustable therealong to occupy a position at either side of said axis, said interponent also cotiperating withsaid carrier to actuate the same efiectively from either side of said axis, and a shaft arranged coaxially with said block and movable periodically to oscillate said element.

2 17. A relieving mechanism of the nature disclosed combining a lower supporting member, an intermediate block swiveled thereto, an upper tool carrier slidablymounted to be reciprocated on said block, an element mounted to oscillate about a given axis extending transversely to the direction of'reciprocation of said C11ll(1", Sfl ltl oscillating element providing a guide.way extending transversely to said direction of'reciprocation and also extending transversely to and across said axis, an interponent movable with said elesmentand cooperating with said guide-Way and adjustable therealong to occupy a position at eithe side of said axis, said interponent also coiiperating with said carrier to actuate the same effectively from either side of said axis, a vertical shaft extending co axially through said block and movable to oscillate said element, and a cam-shaft jour-' naled on said lower supporting memberand enabled periodically to actuate said shaft.

18. A relieving mechanism of the nature disclosed combining a supporting member, a tool carrier slidably mounted to be reciprocated on said member, an element mounted to oscillate about an axis extending trans-" versely to the direction of reciprecation of said carrier, said oscillating element providing a guide-Way extending transversely both to the direction of said reciprocation and to said axis and across the latter, an

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interponent for transmitting motion from said element to said carrier and adjustably mounted on one of the same,said interponent cooperating with said guide-way and adapted to be located at either side of said axis to enable a given stroke of said element to impart a forward or backward stroke to said tool carrier, means mounted on one of said last two mentioned parts for adjusting the position of said interponent relatively to said axis, a shaft extending through said supporting members for operating said osversely to and across said axis, an interponent movable with said element and cooperating with said guide-way and adjustable therealon: to'occupy a position at either side of said said interponent also cooperating w a said carrier to actuate the se me effectively from either side of said axis,

to enable a given stroke of said element to impart a forward or a backward stroke to said tool carrier, a vertical shaft extending coaxially through said block and movable to oscillate said element,.and a horizontal shaft journaled on said, lower supporting member, and a cam moved bysaid shaft and enabled periodically to actuate said vertical shaft.

A relieving mechanism of the nature disclosed combining a non-reciprocating member, an overlying nonreciprocating member swiveled thereto, a reciprocating tool carrier slidably mounted on said overlying member, a rock-shaft coaxial with the swiveled member, means carried by the underlying member for rocking said shaft, and means intervening between said carrier and the upper end of said rock-shaft for enabling the latter to reciprocate the other.

21. A, relieving mechanism of the nature disclosed combining a non-reciprocating lower member, a superposed member swiveled thereto, an upper member slidably mounted on said superposed member, a shaft coaxial with said superposed member, means carried by said lower member adapted to turn said shaft, means enabling the upper end of said shaft to reciprocate the upper member while turning, and means for effecting an angular adjustment between said two means in exact correspondence with a predeterminal angular adjustment of the swiveled member with relation to its supporting member.

22. A relieving mechanism of the nature disclosed comblmng'a lower non-rec 1procating member, an upper reciprocating member,

an intervening member swiveled'to the lower member and slidably connected -to the upper member, a two-part shaft extending from the upper to the lower member in coaxial relation with the intervening member, the

sections of said shaft being adapted to-be non-rotatably connected, means mounted on the lower member for turning the shaft, and means enabling the upper end of the shaft to reciprocate the upper member.

23. A relieving mechanisni'l of the nature disclosed combining a lower member, an intermediate member swiveled thereto, an-

upper member slidably mounted on the intermediate membena cam mounted on the lower member, a shaft extending fromthe lower to the upper member coaxially through the mtermediate member, reciprocating connection between the cam and the lower ably mounted on the intermediate member, a

shaft extending from the lower to the upper member and adapted to be rotated, a sliding pin and slot connection between the upper end of said shaftand said upper member, and means embodied in said connection for enabling the normal eccentricity or throw of the same to be varied.

25. A relieving mechanism of the nature disclosed combinin a tool-post carrier, a cradle laterally ad]us table thereon, a feedscrew journaled in said cradle, a nut longitudinally movable on feed-screw and having a depending pin, a lower member on which said tool-carrier is supported, a vertical shaft journaledin said lower member and terminating in a slotted head receiving said pin, whereby I said toolcarrier may be reciprocated as said shaft is rotated, and means for turning salid shaft.'

26. A relieving attachment of the nature disclosed combining a lower member, an in termediate member swiveled thereto, an upper tool-carrier slidably mounted on said intermediate member, a shaft vertically journaled in the intermediate member and terminated in an upper slotted end, a parthaving a pin engaged by said slot and adapted to be shifted on said upper member laterally to its sliding direct-ion to enable the throw of said pin to be varied, said part being also adapted to be shifted relative to said upper member along the line of reciprocation thereof, whereby the normal position of said upper member on said inter mediate member may be varied, and means mounted on said lower member for rotating said shaft.

.27. A relieving mechanism of the nature disclosed combining a longitudinally movable carriage, a longitudinally extending shaft having one end journaled on said carriage and movable axially therewith, a cam mounted on said shaft, a member adapted to be reciprocated by said cam transversely to the travel of the carriage, an intermediate member 'swiveled to the carriage, a rock- 1.5

member and adapted to be reciprocated by said shaft. I In witness whereof, I'hereunto subscribe my name, as attested by the two subscribing witnesses.

AUGUSTUS M. SOSA.

Witnesses; r ALBERT F. NATHAN,

OLIVER B. KAISER;

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