US1528158A

US1528158A - Universal relieving attachment for lathes

Info

Publication number: US1528158A
Application number: US539523A
Authority: US
Inventors: Lindstrom August Bernhard
Original assignee: Pratt and Whitney Co Inc
Current assignee: Pratt and Whitney Co Inc
Priority date: 1922-02-27
Filing date: 1922-02-27
Publication date: 1925-03-03
Anticipated expiration: 1942-03-03

Description

Mar. 3. 1925.

A. B. LINDSTROM UNIVERSAL RELIEVING ATTACHMENT FOR LATHES s Sheets-Shet 1 Filed Feb. 27, 1922 A. B, LINDSTROM UNIVERSAL RELIEVING ATTA 'CHMENT FOR LATHES Mar. 3. 1925. 1,528,158

Filed. Feb. 2'7. 1922 Sheets-Sheet 5 a f 1 1 .8. 1 as 54 1 a. I

Fatented Mar. 3, 1925:.

UNITED STATES PATENT OFFICE.

AUGUST BEB/NHARID LINDSTROM, OF HARTFORD, CONNECTICUT, ASSIGNOR TO PRATT & WHITNEY COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

UNIVERSAL RELIEVING ATTACHMENT FOR LATHES.

Application filed February 27, 1922. Serial No. 539,523.

exterior and interior relieving operations upon various kinds of work, such as milling cutters, hobs, taps, dies, reamers, etc.

It is an object of the invention to provide a universal relieving attachment comprising a swivel support and a tool slide to be mounted on the cross slide of a lathe, the support being angularly adjustable about the swivel center to any desired position,

and means including a driven element 00- axial of the swivel and reciprocated axially from a cam at the rear of the cross slide and mechanism cooperating therewith for giving relieving movements to the tool slide in any of its several adjustedpositions.

It is another object of the invention to provide a mechanism of the above type driven from a rotary cam, and means for.

rendering the cam rotation inoperative thereon independently of any movement of the tool slide.

Among other objects of the invention are improved means for driving the relieving mechanism from the gearing in the lathe headstock, improved tool slide operating mechanism mounted in the swivelsupport and including means for reversing the direction of relieving movements of the tool slide, means for varying the length of such relieving movements, and opposed resiliently acting means adapted to prevent backlash of the operating mechanism whereby greater accuracy and smoothness of operation is obtained.

With the above and other objects in view, my invention consists in the features of construction and operation'set forth in the following specification and illustrated in can be otherwise embodied and that the drawings are not to be construed as defining or limiting the scope of'the invention,

the claimsappended tothis specification being relied upon for that purpose.

Referring to the figures of the drawings:

Figure 1 is a partial plan view of a lathe equipped with my improved relieving mechanism. 4

Fig. 2 is an end'elevation thereof.

F ig. 3 is a rear elevational view of the relieving attachment driving mechanism adjacent the headstock taken on line 33 of Fig. 1.

Fig. 4 is a plan view thereof with the cover removed.

Fig. 5 is a side view of Fig. 6, partially in section on line 55 of Fig. 8.

Fig. 6 is a front elevational view of the mechanism. 8

Fig. 7 is a detail sectional view.

Fig. 8 is a plan view of the tool slide and its operating mechanism, partially in section.

Fig. 9 is a sectional view thereof on line 9-9 of Fig. 8. I

Fig. 10 is a plan View of the swivel support mounted on the cross slide.

Fig. 11 is a cross sectional view thereof on line 1111 of Fig. 10.

Fig. 12 is an end view of thecross slide, swivel support and tool slide, the taper slide and tool carriage being shown in section.

Fig. 13 is a view like Fig. 12 but with the tool slide screw and its holding plate re-' moved.

Fig. 1 1. is a sectional view of theoperating mechanism taken on line 14 14 of Fig. 8. l

Fig. 15 is a fragmentary end view thereof.

Fig.16 is a cross sectional View thereof on'line 16-16 of Fig. 8.

Fig. 17 is a view like Fig. 16 but showing the cam follower in its inoperative position.

Fig. 18 is a cross sectional view taken on line 1818 of Fig. 8.

Fig. 19 is a detail View taken on line 19--19 of Fig. 8.

vmoved longitudinally or its ways by means of a screw 6. A lathe spindle 7 is mounted in the headstock 3 and is driven from a motor 8 in the base, as specifically disclosed in application Serial No. 513,167. Also, as illustrated in detail in such application, a

carriage and tool slide feeding gear 9 is operated from the spindle 7 by means of a gear 10 on thespindle and an idler gear 11 in mesh with gears 9 and 10. As illustrated, the relieving mechanism is driven from the -gear 9. The lathe which is fully described in the above cited applications, aside from the relieving attachn'ient illustrated, coniprises no part ot the present invention and therefore will net be further described here- On Sheet 3 of the drawings, the carriage is illustrated as provided with the'usual taper slide 12 secured to a former or taper bar 13 riding in a groove 14 or the former ortaper attachment. It will be understood, however, that if desired the former attachment may be removed and the taper slide secured against movement in the carriage in the usual manner. A cross slide 15 is mounted on the taper slide. The cross slide is adjustable by means of a hand wheel 17 and a screw 18 journal-ed in the taper slide and threadedly engaging a nut 19 depending from the cross slide. An auxiliary slide 16 is also mounted on the taper slide to the rear of the cross slide and is secured to the cross slice by means of bolts 16.

A swivel support 20 is illustrated as mounted on the cross slide for swivelling movement about a circular block 21 seat ed therein. The cross slide is provided with a T-slot 22 concentric about theblock, bolts in the support extending into such slot whereby the support may be adjusted about the block as a center and secured in any adjusted position. A tool slide having a tool post receiving T-slot 25 therein is mounted for sliding movement on the support.

At its swivel center directly over the block 21 the support 20 is provided with an axially movable element 26 having a hardened steel block 27 in its lower end.

This block 27 is engaged by one end of a rocker shoe 28 loosely pivoted at 29 in the the element counterbores.

block 21. Means to be hereinafter described engages the other end of the shoe 28 for rocking the same whereby to reciprocate its stated, the rocker shoe is pivoted loosely at 29, the block 21 being provided with'an arcuate seat'SO concentric oi the pivot 29 and against which the arcuate periphery of the shoe bears, the seat 30 thus taking the thrust of the shoe in operation.

A pair oi

intern'ieshing gear segments

31 and 32 are mounted in the support 20, the gear 32 being in mesh with racl: teeth on the element 26. Reciprocation of the element 26 vill rock the gear segments in opposite directions. lVithin the tool slide at opposite sides of the gear segments are mounted a pair of nuts and 33, the nuts respectively having projecting portions 3% and 34L extending over and provided with rack teeth respectively engaging gear segments and 82. The nuts are provided with threaded, bores 35 and 35 "therein for receiving the tool slide screw as herein; after described. The nuts are counterbored at 36 and 36, shoulders 5}? and 3? being provided res ectively at the ends of the Compression sprin s 38 and 38" are mounted in these counteroores and are held therein by means of

bolts

39, 39 threaded into studs 4:0, 10 seated in the support 20. The spring 38 may be placed under greater compression for adjusting purposes by'rotating bolt 89 in its stud 10. Check

nuts

41, 41 are provided on

bolts

39, 39. lit should be noted that spring 38 is'coii'ipressed between the head or the bolt 39 and the shoulder 37 on the nut 33, thus normally acting to force the nut 33 outward ly (to the left, Fig. Spring 36 is compressed between the stud it) and the shoulder 3'? on the nut 32%,thus normally act to force the mitt-33 inwardly (to the right Fig. 8).

The tool slide securing screw 36 is journaled in a plate 12 and is provided with an operating hand wheel The plate may be secured to the tool slide by means of screws 14. In Figs. 8 and 12, the screw is illustrated as oneratively connected to the nut 33. To connect the screw with the nut 33, the securing screws 42: 1 are removed and the plate 1-2. reversed end .torend, which operation brings the screw in alignment with the bore 35 in the nut 33.

The cam slide 16 has mounted therein a rotary shaft s pporting a cam 16 there-on. A nut 45 on the shaft 1-5 permits removal of the cam -16 and the substitution therefor 01 other cams having the desired configuration. Adjacent and parallel with the shaft 4-5 an oscillatory shaft .17. An element as keyed to the shaft 1? and is provided with a pin 49 projecting therefrom. A cam follower 50, provided with a cam engaging shoe 51, is

loosely mounted on a portion of the element 48 about the shaft 47, aspring plunger 52 normally keeping the follower in rotary engagement with the pin 49. The periphery of the pin is flattened at 53 and by rotatably adjusting the pin the follower may be made to engage either this flat portion, as illustrated in Fig. 17, or the higher round portion, as illustrated in F 16. In Fig. 16, the cam engaging shoe 51' in the follower is in cam engaging position and in Fig. 17, the same is out of cam engaging position.

Loosely mounted on the shaft 47 is a bushing 54 on the outer end of which is keyed an operating'handle The inner end of the bushing is provided with a. projecting

portion supporting pins

56 and 57 extending longitudinally of the shaft and adapted to engage respectively in

notches

58 and 59 in a fiange'on the end of pin 49. As illustrated in Fig. 18, the cam follower is engaged on the high portion of the pin 49 whereby the follower is in cam engaging position. The pin 56 is engaged'in notch 58 thereby holding the pin 49 against rotation. It should be noted that the pin 56 has sufficient play in the notch 58 to permit oscillatory movement of the shaft 47 and itsseveral elements without moving the handle and the elements secured thereto. When it is de sired to move the cam follower to the inoperative position, the handle is rotated from the position shown in Fig. 16 to the position shown in Fig. 17 (clockwise in Fig. 18). Such operation withdraws the pm 56 from the notch 58 and moves pin 57 into the notch 59. Continued rotation of thehandle 55 operates through the pin 57 and notch 59 to rotate the pin 49, thereby engaging the flat portion 52 with the cam follower 50. A spring pressed detent 60 is provided for holding the handle 55 in either of its two positions.

Th oscillatory movement of the shaft 47 is transmitted to the tool slide rocker shoe 28 through the following mechanism. Engaging the lower end of the rocker shoe is a hardened steel block 61 on the end of a longitudinal bar or plate 62 extending along the taper slide between such slide and the cross and cam slides. At its rear end, the bar is engaged by the flanged head 68 of a bushing 64 loosely-mounted in the auxiliary slide 16. Extending through the center of this bushand loosely into a bore 65 is a bolt 66. Fleoured to this bolt by means of pin 67 is a block 68 provided with a vertically extending slideway 69 therein. A block 70 mounted on a crank arm pin 71 is adapted in operation to slide in this slideway. The pin and block are secured to a. block72slidably dove tailed over an arm 73 secured to the end of the shaft- A screw 74 provided. with a knurled head 74 is journaled for rotation on the arm 73 at 7 5 (Fig. 19)

and threadedly engages the block 72. As the shaft 47 oscillates, the mechanism just described serves to reciprocate the bar 62. The length of such reciprocation may be varied byadjusting the throw of the crank mechanism through rotation of the screw 7 4. The amount of such. adj ustment is accurately indicated by a pointer 76 on the block 72 movable over a graduated scale on the arm 7 3 (Fig. 19). Check nuts 77, engaging against the bushing 64, are provided on the bolt 66 whereby the mechanism maybe ac curate-1y adjusted and any wear of the sev eral parts compensated for. The housing 78 for the operating mechanism described is preferably provided with a cover plate 79 hinged at 80 and having a handle. and-locking piece 81., the cam 46and the mechanism directly cooperating therewith preferably running in oil in the housing 78.

The cam 46 is illustrated as being operated from thehead stock gearing as follows: A gear bracket or housing 82 is secured to the rear of the head stock by means of bolts 83. Gearing, including change gears, is mounted in this housing for operat ively connecting the before-mentioned gear 9 to the cam 46 for rotating the latter. A cover 84 for the housing normally encloses the gearing therein. A shaft- 85 is mounted in. the housing and carries thereon a change gear bracket arm .86 provided with a T-slot 87 therein. A bolt 88 threaded into this arm extends through an arcuate slot 89 in the'housing whereby the arm may be adjusted about the shaft 85 and secured in itsadjusted position from the exterior. of the housing. This armis illustrated as'carrying two

idler gears

90 and 91 secured together on a stud 92 mounted in the T-slotf A gear 93 is illustrated as being mounted on an eccentric stud 94 on the end of shaft 85, such gear meshing with gears 9 and 90. A handle 95 is mounted on the outer end of shaft 85 and is'provided with a spring pressed detent' handle 96 whereby the shaft may be rotated to engage the gear 90 with gear 9 or disengage the same therefrom, the detent: being adapt'ed'to hold the same in either of its said two positions. It is particularly desirable to disengage the'gear 93 from the gear 9 when using the lathe on work requiring a fast tool feed and therefore afast rotation of the feed gear 9. It should also be stated that the use of the intermediate gear 93 spaces the change gears on the bracket 82 from the headstock and feed gear 9, thereby permitting a compounding of change gears 90, 91 and 98. Such construction furthermore pro vides an easy method of applying the driving mechanism as an attachmentto a lathe not originally constructed for receiving the same.

Beneath the arm 86 is a. shaft 97 carrying a gear 98 in mesh with gear 91. A second gear 99 on the shaft 97 meshes with a pinion 100 on a stub shaft 101 in the housing. The two

portions

102 and 103 of a telescopic shaft in connection with two

universal joints

104 and 105 serve to operatively connect the shaft 101 with the shaft 45 on which the cam 46 is mounted. The cam 46 is thereby rotated from the spindle 7 through the mechanism just described. It will be understood that the gears 90., 91 and 98 may be changed for gears of different sizes whereby to vary the rotation of cam 46 relative to the spindle. It should furthermore be noted that the drive from the gear 9 may be entirely disconnected from the exterior of the housing 82- by rotating the handle 95 to disconnect the gear 93 from the gear 9.

Briefly, the operation of the mechanism is as follows: The cam 4.6 is rotated from the spindle 7 at the desired speed through the driving mechanism last described. is will be noted, this driving mechanism and the cam are at the rear! of the bed out of the way of the operator. For external relieving the screw 36 is threaded into the nut 33, as illustrated in Fig. 8. If it is desired to do internal relieving, the screw is removed from the nut 33 and threaded into the nut 33" in the manner heretofore described. The tool. is adjusted to any desired angular position relative to the work by rotatably adjusting the swivel support 20 about the block 21, bolts 23 operatingin the circular T-slot 22 permitting of such adjustment to any degree. Linear adjustment of the tool is made by rotating

hand wheels

17 and 43. The amount of relief desired is obtained by ro tatably adjusting the screw 74, the amount of such adjustment being indicated by the pointer 76 on the graduated scale; 1th the handle 55 in the position illustrated in Fig. 17, the relieving. mechanism will be inoperative even though the cam. 46 is rotating. This feature of the invention is particularly useful in returning the carriage alongthebed: to itsinitial position after having completed a tooling operation.

With the mechanism properly adjusted relativev to a. piece of work and with the spindle 7 and cam 46 in rotation, to start the relieving operation, the operator moves the handle 55 from the position shown in Fig. 17 to the position shown in Fig. 16. Such 'operationrotates the pin 49-and moves the cam follower. 50 to engage the shoe 51 thereof with thecam. Rotation of the cam transmits an oscillatory movement to the shaft 47 through the cam follower 50 engagingpin 49 on the element 48 keyed. to the shaft. The arm 73 on the other end Ofthe shaft is rocked as the shaft oscillates and thismovement through the block 72, pin 71 and block riding vertically in slideway 69 in block 68 reciprocates the bolt 66 and bushing64longitudinally in the housing 78. This movement is transmitted from the bushing 64 to the bar 62 which rocks the rocker shoe 28 and moves the element 26 vertically. The element 26, through the connections before described, moves the nuts 33 and 33 in opposite directions. t will be noted that such movement compresses both

springs

38 and 38. These springs therefore operate against the relieving movement of the nuts and through the intermediate mechanism normally hold the cam follower shoe 51 of the cam follower 50 in engagement with the cam. As illustrated, the tool slide 24 is operatively connected to the nut 33 (by the screw 36). The tool slide will therefore be moved inwardly under the action of the cam 46 and outwardly under the action of the

springs

38 and 38. It should be noted that the idle stroke of the tool slide 24 under the action of the springs is stopped by the

shoulders

37, 37 respectively abutting against stud 40 and the head of bolt Such construction, being directly adjacent the tool slide, assures instantaneous return of the slide as the cam follower shoe 51 drops off the high portions of the cam. The spring plunger 52 normally holds the cam follower shoe 51 disengaged from the cam. The

springs

38 and 38 always work in opposition to the spring plunger 52. Such construction automatically at all times takes up any looseness in the several operating parts, thereby preventing any back lash in the operation of such parts. The inter-engagement of the operating mechanism between the cam follower 50 and the nuts 33, 33 can be accurately adjusted by means of the nuts 77. The stops, comprising shoulder 37 and nut 41 respectively abutting against studs 40 and40, in con nection with the spring plunger 52 prevent any hammering of the cam follower shoe 51 on the low portions of the cam since the stops limit the action of

springs

38, 38 and the spring plunger 52 normally holds the follower shoe disengaged from the cam. The nuts 77 will of course be adjusted to prevent a close. contact of the follower shoe on the lowermost portions of the cam. The construction just described assures quick and accurate action of the tool slide and its cooperating mechanism, eliminates vibration and looseness of the several operating parts and prevents excessive wear thereon.

After finishing a piece ofwork, it is necessary to move the toolcarriage along the bed back to its initial position. The relieving mechanism must of course be idle during such operation. This may be accomplished, without in any way disturbing the position of the tool slide 24, merely by moving the handle 55 from the position shown in Fig. 16 to that shown in Fig. 17. In such latter position, the tool slide is in its backward position with the shoulder 37 in engagement with the stud 40. It should furthermore be noted that by means of this cam release, the lathe may be used for regular turning without in any way disturbing the cam or its supporting mechanism.

The mechanism as illustrated in the drawing, may be used in performing lathe operations comprising straight or taper work and with or without relieving. However, it should be understood that the swivel support 20, with its tool slide 2 k and cooperating mechanism, is illustrated as mounted on the cross slide 15 in place of the regular tool slide ordinarly used. Furthermore, the cam slide 16 and its cooperating mechanism may also be entirely removed from the machine when the lathe is to be used for plane work requiring no relieving. It will therefore be seen that the relieving attachment comprises primarily an auxiliary tool support and a cam slide with cooperating mechanism, such elements to be mounted on and cooperate with the regular lathe mechanism for performing relieving operations.

hat I claim is:

1. In combination with a lathe comprising a bed, a tool carriage thereon, and a taper slide and cross slide on the carriage, of an auxiliary tool support adapted to be mounted on the cross slide, a tool holder on the support, an auxiliary slide adapted to be mounted on the taper slide and secured to the cross slide, and mechanism in and 00- operating with the auxiliary support and auxiliary slide for giving relieving movements to the tool holder.

2. In combination with a lathe compris ing a bed, a tool carriage thereon, and a taper slide and cross slide on the carriage, of an auxiliary tool support adapted to be swivelly mounted on the cross slide, a tool slide mounted on the support, an auxiliary slide adapted to be mounted on the taper slide and secured to the cross slide, and

i mechanism in and cooperating with the auxiliary support and auxiliary slide for giving relieving movements to the tool slide in all adjusted positions of the support.

3. In combination with a lathe comprising a bed, a tool carriage thereon, and a taper slide and crossslide on the carriage,

of an auxiliary tool support adapted to be mounted on the cross slide, a toolholder on the support, a cam slide adapted to be mounted on the ta ers'lide and secured to the cross slide, an mechanism including a rotary cam in the cam slide and an operativeconnection between the cam and tool support for giving relieving movements to the tool holder.

4:. In combination with a lathe comprising a bed, a tool carria e thereon, and a taper slide and cross slice on the carriage,"

of an auxiliary tool support adapted to be swivelly mounted on the cross sllde, a tool slide mounted on the support, a cam slide adapted to be mounted on the taper slide and secured to the cross slide, and mechanism including a rotary cam in the cam slide and an operative connection between the cam and tool slide for giving relieving movements to the tool slide in all adjusted positions of the support.

5. In a relieving attachment for lathes, the combination with a bed, a tool carriage thereon, a cross slide on the carriage and a headstock on the bed provided with gearing therein, a tool slide on the cross slide at the front of the machine, a rotary cam at the rear of the machine, means including a tele scopic shaft for operating the cam from the headstock gearing, and mechanism between the cam'and tool slide, including a bar extending along the crossslide and reciprocated bythe cam, for giving relieving movements to the tool slide.

6. In a relieving attachment for lathes, the combination with a bed, a tool carriage thereon, a cross slide on the carriage and a headstock .on the bed provided with gearing therein, a swivel support on the cross slide at the front of the machine, a tool slide slidably mounted thereon, a tool slide actuating element arranged coaxially of the swivel and operatively connected to the tool slide, a rotary vcam'at the rear of the machine, means including a telescopic shaft for op erating the cum from the headstock gearing, and mechanism between the cam and element, including a bar extending along the cross slide and reciprocated by the cam, for actuating the said element and giving relieving movements to the tool slide. l

7. In a relieving attachment for lathes, the combination with a bed, a tool carriage thereon, a former bar at the rear of the bed, a taper slide on the carriage operatively connected to the bar, a cross slide on the taper slide, a tool slide on the cross slide, a rotary cam at the rear of the machine, and mechanism between the cam and tool slide, including a bar extending along the taper slide and reciprocatecl by the cam, for giving relieving movements to the tool slide.

8. In a relieving attachment for lathes, the combination with a bed, a tool carriage thereon, a former bar at the rear of the bed, a taper slide on the carriage operatively connected to the bar, a cross slide on the taper slide, a swivel support on the cross slide, a tool slide slidably mounted thereon, a tool slide actuating element arranged coaxially of the swivel and operatively connected to the tool slide, a rotary cam at the rear of the machine, and mechanism between the cam and element, including a bar extending along the taper slide and reciprocated by the cam, for actuating the said element and giving relieving'movements to the tool slide.

9. In a relieving attachment for lathes,

the combination with a'b'ed, a tool carriage and a headstock thereon and gearing in the headstock, a tool slide supported for sliding movement on the carriage, a rotary cam,

means including a telescopic shaft for operating the cam from the headstock gearing, mechanism between the cam and tool slide, including a bar reciprocated by the cam, for giving relieving movements to the tool slide, andadjustable means between the bar and cam for varying the length of the said relieving movements.

10. In a relieving attachment for lathes, the combination with a bed and a toolcarriage thereon, a cross slide on the carriage, a tool slide supported'on the cross slide, a rotary cam at the rear of the machine, means for rotating the cam, an oscillatory shaft parallel. with the rotary axis of the cam, means for oscillating the shaft from the cam, mechanism including an element extending along the cross slide and reciprocated by a crank on the shaft for giving relieving movements to the tool slide, and means for varying the effective length of the crank. to vary the length of relieving movements imparted to the tool slide.

11. In a relieving attachment for lathes, the combination with a bed, a tool carriage and a headstock thereon and gearing in the headstock, a tool support pivotally mounted on the front of the carriage, a tool slide supported for sliding movement on the support, a rotary cam at the rear of the carriage, means including a splined shaft for operating the cam from the headstock gearing, a vertically movable element at the pivotal center of the support, and operative connections between the said element and the cam and tool slide whereby the cam rotation will reciprocate the element vertically and give relieving movements to the tool slide.

12. In a relieving attachment for lathes, the combination with a bed, a tool carriage and a headstock thereon and gearing in the headstock, a tool support pivotally mounted on the front of the carriage, a tool slide supported for sliding movement on the support, a rotary cam at the rear of the carriage, means including a splined shaft for operating the cam from the headstock gearing, a vertically movable element at the pivotal center of the support, operative connections between the said element and the cam and tool slide whereby the cam rotation will reciprocate the element vertically and give relieving movements to the tool slide, the construction permitting the adjustment of the tool slide to any desired angular position about the said element, and means for reversing the direction of relieving movements imparted to the tool slide by the cam.

13 In a relieving attachment for lathes, the combination with a bed, a tool carriage and-a headstock"thereon-and gearing in the headstock, a tool slide supported for sliding movement on the carriage, a rotary cam, means including a splined shaft for operating the cam from the headstock gearing, mechanism between the cam and tool slide, including a bar reciprocated by the cam, for giving relieving movements to the tool slide, and means for rendering the rotation of the cam inoperative on the bar.

14. In a relieving attachment for lathes,

the combination with a bed, a tool carriage and a headstock thereon and gearing in the headstock, a tool slide supported for sliding movement on the carriage, a rotary cam, means including a telescopic shaft for operating the cam from the headstock gearing, mechanism between the cam and-tool slide, including a bar reciprocated by the cam, for giving relieving'movements to the tool slide, adjustable means for varying the length of the said relieving movements, means comprising a normally stationary handle for rendering the rotation of the cam inoperative on the tool slide, the said handle having an operative and an inoperative position, and means for holding the handle in either of such positions.

15. In a relieving attachment for lathes, the combination with a bed and a tool car riage thereon, a tool slide supported for sliding movement on the carriage, a rotary cam, means for rotating the cam, mechanism between the cam and tool slide, including a cam follower operative on the cam, for giving relieving movements to the tool slide,- resilient means for holding the cam. follower in engagement with the cam, and means optionally operative to hold the follower away from the cam thereby rendering the cam rotation inoperative on the said mechanism.

16. In a relieving attachment for 'lathes, the combination with a bed and a tool car riage thereon, a tool slide supported for sliding movement on the carriage, a rotary cam, means for rotating the cam, mechanism between the cam and tool slide, including a cam follower operative on the cam, for giving relieving movements to the tool slide, resilient means for holding the cam follower in engagen'ient with the cam, and means optionally operative independently of the said resilient means for holding" the follower away from the cam thereby rendering the cam rotation inoperative on the said mechanism.

17. In a relieving attachment for lathes, the combination with a bed and a tool carriage thereon, a tool slide supported for sliding movement on the carriage, a rotary cam, means for rotating the cam, mechanism between the cam and tool slide, including a cam follower operative on the cam, for giving relieving movements to the tool slide. resilient means for holding the cam follower in engagement with the cam, and means for rendering the cam rotation inoperative on the said mechanism without moving the tool slide.

18. In a relieving attachment for lathes, the combination with a bed and a tool carriage thereon, a tool slide supported for sliding movement on the carriage, a rotary cam, means for rotating the cam, mechanism between the cam and tool slide, including a cam follower operative on the cam, for giving relieving movements to the tool slide, resilient means adjacent the tool slide for normally withdrawing the toolslide and holding the follower in engagement with the cam, and weaker spring means adjacent the cam follower operative against the action of the resilient means whereby to take up backlash in the said mechanism.

19. In a relieving attachment for lathes, the combination with a bed and a tool carriage thereon, a tool slide supported for sliding movement on the carriage, a rotary cam, means for rotating the cam, mechanism between the cam and tool slide, including a cam follower operative on the cam, for giving relieving movements to the tool slide, resilient means adjacent the tool slide for normally withdrawing the tool slide and holding the follower in engagement with the cam, weaker spring means adjacent the cam follower operative against the action of the resilient means whereby to take up backlash in the said mechanism, and adjustable means for increasing the action of the said resilient means to take up looseness in the mechanism due to wear.

20. In a'relieving attachment for lathes, the combination with a bed and a tool carriage thereon, a tool slide supported for sliding movement on the carriage, a rotary cam, means for rotating the cam, mechanism between the cam and tool slide, including a cam follower operative on the cam, for giving relieving movements to the tool slide, resilient means adjacent the tool slide for holding the cam follower in engagement with the cam, weaker spring means adjacent the cam follower operative against the action of the resilient means and tending to disengage the cam follower from the cam, and means for either holding the follower in cam engaging position against the action of the spring means or permitting the spring means to move and hold the follower out of cam engaging po sition.

21. In a relieving attachment for lathes, the combination with a bed and a tool carriage thereon, a tool slide supported for sliding movement on the carriage, a r0.- tary cam, means for rotating the cam, mech anism between the cam and tool slide including a cam follower mounted on an oscillatory shaft for giving relieving movements to the toolslide, resilient means for holding the cam follower in engagement with the cam, means comprising a normally inoperative position, and means for holding the handle in either of said positions.

22. In a relieving attachment for' lathes, the combination with a bed and a tool carriage thereon, a tool slide supported for sliding movement on the carriage, 'a rotary cam, means for rotating the cam, an oscillatory shaft, an element keyed to the shaft, a cam follower loose on the shaft and normally in rotative engagement with the element, mechanism between the oscillatory shaft and tool slide for giving relieving 'movements to the tool slide, and means including a handle loose on the oscillatory shaft for changing the relative angular positions of the element and follower to either hold the follower in oper-- ative position relative to the cam or in inoperative postion relative thereto.

23. A relieving mechanism comprising the combination of a swivel support, a tool slide mounted for sliding movement there on, an element arranged coaXially of the swivel, means for reciprocating the element axially, and mechanism connecting the tool slide with the element for reciprocating the tool slide relatively in either direction for external or internal relieving as, the element is reciprocated.

24:. A relieving mechanism comprising the combination of a swivel support, a tool slide mounted for sliding movement thereon, an element arranged coaxially of the swivel, means for reciprocating the element axially, mechanism connecting the tool slide with the element for reciprocating the tool slide relatively in either direction for external or internal relieving as the element is'reciprocated, and adjustable means for varying the length of the reciprocations of the tool slide, the said swivel support being angularly adjustable to any position about the swivel axis and the SEIlCl'lll-BCllanism being operative in all positions of adjustment.

25. A relieving mechanism comprising the combination of a swivel support, a tool slide mounted for sliding movement there on, an element arranged coaxially of the swivel, means for reciprocating'the element axially, mechanism connecting the tool slide with the element for reciprocating the tool slide as the element is reciprocated, adjustable means for varying. the length of the relieving movements of the tool slide, and means for reversing the direction of such movements relative to the reciproating movements of the said element.

26. A relieving mechanism con'iprising the combination of a swivel support, a tool slide mounted for sliding movement thereon, an actuating element arranged coaxially of the swivel, means for actuating the ele ment, and mechanism comprising a gear on the support operatively connected with the element and slide for reciprocating the slide as the element is actuated.

27. A relieving mechanism minprising the combination of a swivel support, a tool slide mounted for sliding movement thereon, an actuating element arranged coaxially of the swivel, means for actuating the element, mechanism comprising a pair of gears on the support operatively connected to the element in a manner to be rotated in opposite directions thereby as the element is actuated, and means for operatively connecting either gear to the slide whereby to reciprocate the slide in either direction relative to the movements of the element as the element is actuated.

28; A relieving mechanism comprising the combination of a swivel support, a tool slide mounted for sliding movement thereon, an actuating element arranged coaxially of the swivel, means for actuating the element, mechanism comprising a pair of gears on the support operatively connected to the element in a manner to be rotatedin opposite directions thereby as the element is actuated, a rack meshing with each gear, and means comprising a screw for adjustably connecting either rack with the slide whereby to reciprocate the slide in either direction relative to the movements of the element as the element is actuated.

29. A relieving mechanism comprising the combination of a swivel support, a tool slide mounted for sliding movement thereon, a rack arranged coaxially of the swivel, means for reciprocating the rack axially, and 1nechanism comprising a gear having toothed engagement with the rack and slide for re ciprocating the slide as the rack is reciprocated.

30. A relieving mechanism comprising the combination of a swivel support, a tool slide mounted for sliding movement thereon, a rack arranged coaXially of the swivel, means for reciprocating the rack axially, mechanism comprising a pair of gears operatively connected to the rack in a manner to be re tated in opposite directions thereby as the rack reciprocates, and means for operatively connecting either gear to the slide whereby to reciprocate the slide in either direction relative to the rack as the rack reciprocates.

31. A relieving mechanism comprising the combination of a cross slide, a swivel support mounted thereon, a tool slide mounted for sliding movement on the support, an axially reciprocating element in the support coaxial of the swivel, mechanism connecting the tool slide'with the element for reciprocating the tool slide as the element is reclprocated, a bar extending along the cross slide, means for reciprocating the bar, and means comprising a rocker shoe between the bar and element for transmitting the reciprocating movements of the bar to the element.

A. relieving mechanism comprising the combination of a cross slide, a block mounted therein and provided with an arcuate seat, a swivel support mounted thereon for adjustment about the block, a tool slide mounted for sliding movement on the support, an axially reciprocating element in the support coaxial of tie swivel, mechanism connecting the tool slide with the elementfor reciprocating the tool slide as the element reciprocates, a bar extending along the cross slide, means for reciprocating the bar, and means comprising a rocker shoe provided with an arcuate portion seated for sliding movement and bearing against they said arcuate seat in the block, the said shoe operating between the bar and element for,

transmitting the reciprocating movements of the bar to the element.

In a relieving mechanism, the combination of a rotary cam, a shaft adjacent thereto, an element keyed to the shaft, a cam follower loose on the shaft, spring means normally holding the follower in rotative engagement with the element, and means including a normally stationary handle for changing the relative angular positions of the element and follower to either hold the follower in operative position relative to the cam or in inoperative position relative thereto.

34. In a relieving mechanism, the combination of a rotary cam, a shaft adjacent thereto, an element keyed to the shaft, a cam follower loose on the shaft and normally in rotative engagement with the element where by the shaft may be oscillated upon rotation of the cam, and means including a handle loose on the shaft for changing the relative angular positions of the element and follower to either hold the follower in operative position relative to the cam or in inoperative position relative thereto.

85. In a relieving mechanism, the combination of a rotary cam, a shaft adjacent thereto, an element keyed to the shaft and provided with a projection thereon, a cam follower loose on the shaft, a spring normally holding the follower in engagement with the projection, and means including a handle loose on the shaft for moving the projection whereby the element and follower are relatively moved-angularly to either hold the follower in operative position relative to the cam or in inoperative position relative thereto.

36. In a relieving mechanism, thecombiprovided with a projection thereon, the projection being, provided with a high and low portion, a cam follower loose on the shaft, a spring normally holding the follower in engagement with the projection, and means including a handle loose on the shaft for rotating the projection whereby to engage either the said high or low portion with the follower to hold the follower in operative or inoperative positions respectively relative to the cam.

3?. In a relieving mechanism, the combination of a rotary cam, a shaft adjacent thereto, an element keyed to the shaft and provided with a projection thereon,.the pro jection being provided with a high and low portion, a cam follower loose onthe shaft, a spring normally holding the follower in engagement with the projection, means including a handle loose on the shaft for rotating the projection whereby to engage either the said high or low portion with the follower to hold the follower in operative or inoperative positions respectively relative to the cam, and means for holding the last mentioned means in either of its said positions.

38. In a relieving attachment for lathes, the combination with a bed, a tool carriage and a headstock thereon and a gear rotatable in the headstock, a tool slide sup ported for movement on the carriage, mechanism for operating the tool slide comprising gearing and shafting including change gears adjacent the headstock, a gear adapted to operatively engage certain of the change gears and the first mentioned gear, and means for bodily moving the second mentioned gear into and out of mesh with the first mentioned gear.

39. In a relieving attachment for lathes, the combination with a bed, a tool carriage and a headstock thereonand a gear rotatable in the headstock, atool slide supported for movement on the carriage, mechanism for operating the tool slide comprising gearing and shafting including change gears adjacent the headst0ck, a gear adapted to operatively engage certain of the said gear ing and the first mentioned gear, and means for bodily moving the second mentioned gear laterally into and out of mesh with the first mentioned gear.

40. In a relieving attachment for lathes, the combination with a bed, a tool carriage and a headstock thereon and a gear rotatable in the headstock, a tool slide supported for movement on the carriage, mechanism for operating the tool slide comprising gearing and shaft including change gears, a rotary shaft provided with an eccentric portion thereon, agear mounted on the said eccentric portion and adapted to operatively engage certain of the said gearing and the first mentioned gear, and means for rotating the shaft for bodily moving the second mentioned gear into and out of mesh with the first mentioned gear.

41. In a relieving attachment for lathes, the combination with a bed, a tool carriage and a headstock thereon and a gear rotatable in the headstock, a tool slide supported for movement on the carriage, a housing adapted to; be secured to the machine adjacent the headstock, gearing including change gears mounted in the housing, an arcuately adjustable arm mounted in the housing and carrying certain of the change gears, means engaging the arm and extending through a slot in the housing to the exterior thereof whereby the arm may be arcuately adjusted from the exterior of the housing, means including a telescopic shaft connecting the said gearing with the tool slide, a gear adapted to operatively engage certain of the said gearing and the first mentioned gear, and means exterior of the housing for bodily moving the-second mentioned gear into and out of mesh with the first mentioned gear.

In testimony whereof, I hereto affix my signature.

AUGUST BERNHARD LINDSTROM.