US1772801A - Broaching machine - Google Patents

Description

5 Sheets-Sheet l i amen 115w zjosnwedo g- 1930- c. w. EGGENWEILER ET AL BROAGHI-NG MACHINE Filed Oct. 27, 1924 1930. c. w. EGGENWEILER ET AL 1,772,801

- 4 BROAGHING MACHINE Filed 1924 5 Sheens-5heet 2 Jaye! A g- 1930. c. WLEGGENWEILER ET AL 1,

BROACHING MACHINE Filed Oct. 27, 1924 5 Sheets-Sheet 3 71 7101: n: m J

1930. c. w. EGGENWEILER ET AL 1,772,801

BROACHING MACHINE Fil 00% 1924 5 Sheets-Sheet 4 Snow/tow C/zardes Wymwez' dex Wiz mm rf Z%62 Patented Aug. 12, 1930 UNlTED STTE PATE CHARLES W. EGGENWEILER AND WILLIAM. J. FIEGEIJ, 01E DETROIT, MICHIGAN, A5 SIGNORS, I BY MESNE ASSIGNMENTS, '10 BORN ALUMINUM & BRASS CORPORATION,

A CORPORATION OF MICHIGAN BROACHING MACHINE Application filed October 27, 1924. Serial No. 746,0t9.

The invention relates to broaching machines designed particularly for breaching bearing or like sections. One of the objects of the invention is the provision of an improved machine which will broach the bearing or like section to very close limits. Other objects are the provision of means for accurately adjusting the holder for the bearing or like section; the provision of an improved broach holder; the provision of an improved broach; the provision of a relief cutter; the provision of means for accurately adjusting the relief cutter relative to the broach; the provision of an improved drive mechanism for the broach; the provision of an improved mechanism for controlling the operation of the drive mechanism; and the provision of means for accurately adjusting the holder for the bearing or like section.

With these as well as other objects in view the invention resides in the novel features of construction and combinations and arrangements of parts as more fully hereinafter set forth;

In the drawings:

Figure 1 is a side elevation, partly in sec-- tion, of a broaching machine embodying our invention;

Figure 2.is a rear elevation of a portion thereof; Y

Figure 3 is a top plan view thereof;

Fi ure 4 is a cross section on the line H of Flgure 1;

Figure 5 is an enlarged similar view with the slide shown partly in section;

Figure G is a cross section on the line 6-6 of Figure 5; 1

Figure 7 is a longitudinal section through the slide and broach and relief cutter mechanisms;

Figure 8 is a cross section on the line 8-8 of Figure 7 4 Figures 9 and 10 are respectively a front side elevation and an end elevation of the trip and brake controlling mechanism;

Figure 11 is a cross section on the line 11-11 of Figure 1;

Figure 12 is a cross section on the line 12-12 of Figure 7.

The body of the machine comprises the bed 1 supported upon suitable standards and the cap 2 secured upon the bed. The bed is hollow or channel-shaped and has the spaced front and rear side walls 3 having the upper outwardly ofi'set portions 4 providing the parallel vertical guide surfaces 5 and the aligned horizontal supporting guide surfaces 6. The cap is rigidly secured to the upper edges of the outwardly ofiset portions 4 and is provided intermediate its ends and at the front side thereof with the openin 7 for the purpose of facilitating the assem ly of the interior parts of the machine as well as inserting and removing the bearing or like sections. The bed is provided intermediate its ends and below the opening 7 with the raised portion 8 of the bottom wall which is integral with the side walls 3.

The upper face of this raised portion 8 is inclined downwardly toward the rear end of the machine and supports the wedge 9 having a horizontal upper face. This wedge supports the hearing or like section holder 10 which has a concave semi-cylindrical upper face for receiving the section and is adjustably mounted thereon. In detail, 11 is a block formed of yieldable material, such as brass. This block engages'in the recess 9' formed in the middle of the upper face of the wedge 9 and supports the holder 10 above this upper face and spaced therefrom. The holder is adj ustably secured to the wedge by the set screws 12, by means of which the yieldable block may be compressed to control the angle of inclination of the holder. Also the holder is rotatably adjustable parallel "to the wedge, the lower series of set screws 12' threadedly engaging the side walls 3 of the bed 1 and abutting the holder near its lower edge for adjusting and retaining the same in the correct position. 13 are, rockable levers in the form of bell crank levers pivoted upon the bottom wall of the bed 1 and adapted to swing horizontally. These levers are located at opposite ends of the wedge 9 and have inwardly extending arms adapted to engage the ends of the wedge and longitudinally extending arms adapted to be engaged by the set screws 14: which threadedly engage the front side wall of the bed 1.

For clamping the hearing or like section in the holder 10 we have provided clamping members each comprising the vertically extending bar and the head 16, the bars extending upon opposite sides of the raised portion 8 of the bottom wall of the bed and having their lower endspivotally connected at 17 to the block 18. This block has a cylindrical journal portion provided with a vertically elongated aperture 19 extending diametrically therethrough as well as an aperture 20 ex tending transverselyof the aperture 19. 21

is a cam located within the aperture 19 andsecured upon the shaft 22 which extends through the aperture 20. 23 is a hardened block within the a erture 19 and below the cam 21, this block eing secured in position by means of the set screws 24 threa ed into the lower end of the cylindrical bearing portion of the block 18. 25 is a housing secured to thebed 1 and having a vertically extending cylindrical bearing portion for engagement "therein by the journal portion of the block 18 and a horizontally extending)bearing portion for engagement therein y the shaft 22. 26 is a handle secured upon the end of the shaft 22 at the front side of the machine and 27 is a fly wheel between the handle and the bed for storing up sufficient energy to assure carrying the handle and shaft around to produce the desired clamping pressure upon the side edges of the hearing or like section. Movement of the handle is limited by means of the set screw 28 upon the fly wheel and the set screw 29 u on the housing 25, these set screws being ad ustable. Stripper plungers 18' are provided for raising the bearing section from the holder 10 upon disengagement of the clamping members caused by raising block 18 upon which plungers 18' have a bearing engagement.

To permit the heads 16 of the clamping members to move away from the bearing or like section when the clamping pressure has been removed, clearance is provided between the lower portions of the side walls 3 of the bed and the bars 15 carrying the heads and clearance is also provided at the upper edges of the lower portions of the side walls for the heads. Hardened blocks 3 are secured in rabbets at these upper edges for engagement by the heads. A spring 30 is provided upon the inner side of each bar and abutting against the adjacent face of the raised portion 8 of the bottom wall of the bed to force the bar and its head outwardly. Each spring is normally bowed to move the clamping heads laterally outwardly when the latter have been raised. To provide for moving these clamping heads laterally inward when their bars are being pulled downwardly, each head has a cam face 31 which is slidable over' its hardened block 3'.

For the urpose of maintaining the holder 10 for the aring or like section in accurate clamping-members, the set screws 12 are provided threadedly engaging the side walls 3 of the bed and abutting the upper sides of the holder near opposite ends.

32 is the slide engaging the bearing surfaces 5 and 6 of the bed 1 and also the bearing surface 33 ofthe cap 2. This slide has adjustably longitudinally secured to one of its faces the gib 34 for taking up play between the bearin surfaces 5, the face of the gib adjacent to tile slide being relieved to provide a bearing face of relatively small height permitting of rockin the gib about the slide. The upper face 0 the slide 32 is provided with the recess 35 in Which suitable padding 36 is located for retaining lubricant. This lubricant is fed to the padding by means of the longitudinally extending bore 37 in the slide and is fed fromthe padding to the bearing surfaces 5 and 6 by the b0res'38 and 38 respectively which connect into the bore 39.

40 is the broach formed of the sets of annular teeth 41, 42 and 43 mounted rigidly upon and preferably integral with the shaft 44. The teeth of the first set 41 decrease in diameter from the front to the rear while the teeth of the second set 42 are of the same diameter. The teeth of the third set 43 are of the same diameter and are shaped to burnish the bearing or like section. 45 is the broach holder which is rigidly secured to the lower face of the slide 32 and has depending projections at vopposite ends of each set of teeth to which suitable caps are secured, the caps cooperating'with the depending projections to clamp the shaft of the broach. Clearance is provided between the first and second sets of teeth 41 and 42 respectively and the depending projections at the ends of these teeth. However the set of teeth 43 fits between the projections at its opposite ends so that the broach is securely held from longitudinal movement relative to the slide.

46 is the relief cutter which is adapted to engage the bearing or like section after the broach has performed its work. This relief cutter is of greater diameter than any of the teeth of the broach and its axis is located above the axis of the broach teeth so that the relief cutter takes a slight cut from the inner surface of the bearing or like section adjacent to its side edges. This relief cutter is adjustably secured'to the slide 32 to properly position the same with respect to the broach. As shown'particularly in Figures 7 and 8,.the relief cutter has a shaft 46 fitting in a bore in the lower portion of the holder 47 and this holder'has in its upper edge a longitudinal groove in which the key 47 is located. This key has an n per rounded surface engaging the lower si e of the slide 32. 47 are set traws on pp te sid s of t e y for 'securing the holder in place. 47 is a screw connected to the front end of the slide in such a way that the screw is held from rotation but may have a slight angular or universal movement relative to the slide. The screw engages in the recess 49 in the front end of the slide 32 and has on diametrically oppositesides the transverse slots-50 which are freely engaged in by the bars 51, these bars being fixedly secured to the front end of the slide. 52 is a sleeve surrounding the screw 48 and having at its rear end the threaded portion 53 forming the nut engag 1 cap 2 of the machine.

' belt respectively pass.

ing the screw. This sleeve is journaled at its opposite ends in the housing 54 which is secured to the front ends of the bed 1 and 55 is a housing sleeve secured to the front end of the housing 54 and extending a sufficient distance to inclose that portion of the screw projecting beyond the housing 54 when the screw and the slide connected thereto are at the forward end' of their travel. 56 is the driving pulley secured to the. sleeve 52 by suitable means such as the key 57. 58 and 59 are idler pulleys atopposite sides of the driving pulley and journaled upon the sleeve 52.

To lubricate the screw and associated parts within the housing 54 there is the oil cup 60. upon the housing sleeve 55 and communicating through the passageway 61 with the space surrounding this screw adjacent to the front bearing for the sleeve 52. This lubricant passes from the passageway 61 down upon the pin 62 and then drops upon the screw which carries the lubricant rearwardly, some of the lubricant passing through the radial passageways 63 and 64 in the sleeve 52 to the bearing surfaces upon which the idler pulleys are journaled, and some of the lubricant passing to the rear bearing for the sleeve 52.

65 and 66 are respectively cross and straight belts adapted to drive the driving pulley 56 in opposite directions. In their normal positions these belts respectively engage the idler pulleys 59 and 58. 67 is the belt guide which comprises the body 68 and the bars 69 and 7 O secured to opposite sides thereof. These bars have return bent ends forming the loops 71 and 72 respectively through which the cross belt and straight The body 68 is secured near its middle to the shifter rod 73 which extends longitudinally above the machine pin 91 and beyond its rear end. The end of the body at the front side of the machine is sleeved upon the rod 7 4 which extends longitudinally above the housing 54. The end'of the body at the rear side of the machine is sleeved upon the brake actuating rod, 75 which extends longitudinally above the machine in rear of the rod 73. The first-mentioned end of the body is bifurcated for the passage of the brake rod 76 which is connected at one end to one end of the brake band 77 and at the other end to the rock arm 78. This rock arm has a hub 79 engaging between the bifurcations of the second-mentioned end of the body 68 and fixed upon the brake actuating rod 75 by suitable means such as a pin extending transversely through the hub and the rod 80 is a hand lever operable from the. front side of the machine and pivoted at the rear side and pivotally connected intermediate its ends to the shifter rod 73. 81 is a combined trip and brake controlling mechanism mounted upon the rear end of the machine. This mechanism comprises the'hand lever 82 extending toward the front side of the machine and pivotally mounted at 83 upon the cap 2 to be swung through a path transverse to the machine. This hand lever has above its pivot the front and rear bifurcations 84 in which slide the reduced ends 85 of the cam member 86. The upper surface of this cam member is provided with the centrally located raised cam surfaces 87 and the substantial- 1y aligned surfaces 88 at opposite ends of the cam. 89 is a quadrant secured upon the brake actuating rod 75 adjacent to the cam member 86. 90 is a finger having a hub sleeved upon the brake actuating rod 75 and having a portion adapted to engage the upper surfaces 88 of the cam member and also the cam surface 87. This finger has the transverse engageable in an arcuate slot 92 in the quadrant 89 and movement of the finger in one direction of rotation, namely in the clockwise direction, is limited by means of the set screw 93 adjustably threaded in the quadrant and engageable with the finger. It will be seen that after the finger 9O rides over a surface 88 of the cam member and upon the cam surface 87 it will be compelled to swing about the brake actuating rod until it engages the set screw 93 when further rotation of the finger causes rotation of the brake actuating rod. The rotation of this brake actuating rod in this direction through the rock arm 78 tightens up the brake band thereby suddenly stopping the driving pulley from rotating further. The shifter rod 73 is provided at its rear end with the depending finger 94 which is engageable by the rear end of the slide 32. This shifter rod is also provided with the depending finger 95 which extends downwardly through the slot 96 in the cap 2 and is engageable with the end 97 of the slot 98 formed longitudinally in the upper face of the slide 32.

With a bearing or like sectionclamped in the holder 10 and the parts of the machine in the positions shown in Figure 1, the trip lever 82 is depressed against the resistance offered by the coil spring 99 thereby rocking. the cam member 86 out of engagement with the finger 90 which allows the finger to drop and the rock shaft to rotate to its original position under the influence of the coil spring 100 which is connected at one end to the rock arm 78 and at the other end to the body 68. This coil spring also releases the brake band 77v upon the driving pulley 56. The hand lever 80 may then be swung toward the front end of the machine thereby moving the shifter rod '73 forwardly and consequently moving the belt guiding mechanism forwardly to bring the straight belt 66 into engagement with the driving pulle 56. At the time this belt transfer mec anism is moved toward the front end of the machine it compels the brake actuating rod 75 to also move in the same direction therebyshifting the fin er 90 of the combined trip and brake 'contro ling mechanism so that 1tis in advance of the cam surface 87 and is. adapted to engage the front upper surface 88 of the cam member when the trip handle is released. This handle may be released immediately after the shifting of. the hand lever 80. The screw will now travel toward the rear end of the machine carrying with it the slide 32 and the holders for the broach and relief cutter. As the slide'draws near its limit of travel in this direction it comes into contact with the depending finger 94 upon the shifter rod 73 and compels the latter to move toward the rear end of the machine. This shifter rod in turn through the belt transfer mechanism moves the brake actuating rod 75 I toward the rear end of the machine which moves the finger 90 along the cam member 88 bringing the finger against the cam surface 87 at which time the cam member is moved toward the rear end of the machine until its rear shoulder engages the rear projection of the trip lever 82. Then during the final movement of the shifter rod and brake actuating rod in this direction the finger rides upwardly upon the cam surface 87 and in doing so is compelled to rotate, which as before described causes the brake actuating rod to rotate and tighten the brake band 7 upon the driving pulley 56 at the proper time during the travel of the slide. To return the slide to its original position or toward the front end of the machine, the trip lever 82 is again depressed and the hand'lever 80 swung toward the rear end of the machine whereby the shifter rod 73 is longitudinally moved toward the rear end of the machine. This movement compels a similar movement of the brake actuating rod 75 to locate the finger 90 at the rear end of the cam surface 87. As the slide nears the limit of its travel toward the front end of the machine the shoulder 97 of its slot 98 comes into contact with the depending finger 95 shifting the rod 73 toward the front end of the machine and conse uently shifting. the brake actuating rod 7% in like manner. This brake actuating rod moves the finger 90 which first slides over the rear upper surface 88 of the cam member 86 and then against the cam surface 87 at which time it longitudinall shifts the cam member toward the front en of the machine until limited by the front bifurcation 84 of the trip lever. Then upon continued movement the finger rides upwardly upon the cam surface 87 and finally rotates the brake actuating rod to apply the brake when the latter registers with the driving pulley.

The idler pulleys 58 and 59 are each at least twice as wide as the corresponding belts 66 and so that either belt may be shifted on its pulley a distance to permit the other belt to be shifted onto the driving ulley 56. The belt shifter 67 as well as the rake mechanism is bodily shifted alternately first to shift one belt onto the driving pulley while the brake is moved off to a portionv surrounding the idler pulley engaged by the other belt and then at the end of that driving operation the control mechanism shifts the entire unit so as to place the belt just acting as a drivin belt onto its idler pulley and the brake mec anism again on the driving pulley, at which time the brake is applied. To return the broach carrying slide the parts are shifted to place the other belt onto the driving pulley while at the same time the brake is shifted to a position surrounding the idler pulley occupied by the idle belt. Consequently as either belt is shifted off the driving vpulley the brake is shifted thereon and subsequently immediately applied.

What we claim as our invention is:

1. In a broaching machine for half bearings and the like, a broach holder, a broach carried thereby, means for rigidly mounting and guiding the broach holder in a predetermined path, means for reciprocating said broach holder, a connection between said means and broach holder providing relative angular movement in all directions, a work holder, and means for universally adjusting said work holder with respect to the path of travel of said broach to rock the half bearing transversely and longitudinally.

2. In a broaching machine, the combination with a holder for the work, of a recipro cable slide, a broach carried by said slide for engaging the work, and a reliefcutter carried by said slide for engaging the work, one of said members carried by said slide being adjustable relative to the other of said mem- 3. In a broaching machine, the combination with a holder for the work, of'a reciprocable slide, a broach carried by said slide for engaging the work, a relief cutter, a support for said relief cutter, a wedge-shaped key between said relief cutter and slide and means for relatively adjusting said key and support and for rockably adjusting said support upon said slide and securing said support to said slide. 1

4. In a broaching machine the combination with a holder for the work, of a reciprocable member, a broach for engaging the work comprising a shaft and a plurality of sets of teeth spaced longitudinally of said shaft, and a support for said broach secured to said reciprocable member and including projections at opposite ends of said sets of teeth and caps cooperating with said projections to clamp said shaft in place, the projections at opposite ends of one of said sets of teeth abutting the same.

5. In a broaching machine, the combination with a driving pulley, an idler pulley, a

belt engageable with said pulleys and a member driven by said driving pulley when said belt is in engagement with said driving pulley, of means controlled by said member for shifting said belt into engagement with said idler pulley and for applying a brake to said driving pulley, said means including a shiftable cam, normally preventing accidental operation of the machine.

6. The combination with a driving pulley, an idler pulley on each side of said driving pulley, a belt engageable with one of said idler pulleys and said driving pulley for rotating the latter in one direction, a second belt engageable with the other of said idler pulleys and said driving pulley for rotating the latter in the opposite direction, a reciprocable member driven by said driving pulley when either of said belts is in engagement with said driving pulley, and two inter-dependent successively operable means for initiating the movement of said reciprocable member, of means controlled by said reciprocable member for shifting the belt from engagement with said driving pulley into engagement with its idler pulley and for applyin a brake to said driving pulley.

7. fn a broaching machine, the combination with a driving pulley, an idler pulley, a belt engageable with said pulleys, and a member driven by said driving pulley when said belt is in engagement with said driving pulley, of a brake mechanism engageable with said driving pulley, mechanism for shifting'the belt into engagement with said idler pulley and for said brake mechanism,

manual means shifting said belt on said driving pulley including a safety lever previously operable, and means controlled by said driven member for actuating said belt shifter and brake applying mechanism.

8. In a broaching machine, the combination with a driving pulley, an idler pulle a belt engageable with said pulleys, an a member driven by said driving pulley when said belt is in engagement with said driving pulley, of a belt shifter, a shifter rod connected to said belt and engageable by said driven member, a brake carried by said belt shifter, a rod for applying said brake to said driving pulley, said rod being movable with said belt shifter and means for rotating said rod upon movement thereof, with said belt shifter to apply said brake.

9. In a broaching machine, the combination with a body, a slide upon said body, a driving pulley, an idler pulley, a belt engageable with said pulleys, a member for actuating said slide from said driving pulley when said belt is in engagement with said driving pulley, means for shifting said belt into engagement with said idler pulley, a brake carried by said shifting means, a shifter rod mounted upon said body and connected to said shifting means, said shifter rod being shiftable'relative to said body by said slide, a rotatable rod mounted upon said body and connected to said brake, said rod being movable with said shifting means, and means upon said body for rotating said last-mentioned rod upon movement thereof with said shifting means to apply said brake.

10. In a broaching machine, the combination with a surfacing element or the like having a fixed path of travel, of a hollow bed having a bottom wall, said bottom wall having a portion provided with an inclined upper surface, a work support and a wedgeshaped member carrying said work support and engaging said inclined upper surface, and means operable from outside said bed for adjusting said wedge relative to said raised portion.

11. In a broaching machine, the combination with a surfacing element or the like having a fixed path of travel, of a hollow bed, having a bottom wall provided with a bottom having an inclined upper surface, a Work support, a Wedge-shaped member carrying said work support, and engaging said inclined upper surface, bell crank levers engageable with the ends of said wedgeshaped member and set screws threadedly engaging said bed and adj ustable from outside the same for adjusting said bell crank levers.

12. In a broaching machine, the combination with a surfacing element or the like having a fixed path of travel, of a hollow bed having a bottom wall provided with a portion having an inclined upper surface, a wedge-shaped member adjustably engaging said inclined upper surface and a work support adjustably mounted upon said wedgeshaped member.

13. In a broaching machine, the combination with a surfacing element or the like reciprocating witha fixed path of travel, a hollow bed, of a fixed work support mounted upon said bed, members for clamping the work to said work support, a block to which said members are pivotally connected, and means supported upon said bed for raising and lowering said block. I

. 14. In a broaching machine, the combination with a surfacing element or the like reciprocatin with a fixed path of travel, a hollow ber of a fixed work support mounted upon said bed, members for clamipng the work to said work support, a block to which said members are pivotally connected, and means supported upon said bed for raising and lowering said block, and means for moving said clamping members away from the work when said block is raised.

15. In a broaching machine, the combination with a surfacin element havin a reciprocatory accurate y predetermine .path of travel, a hollow bed, of a work support mounted thereon, members for clamping the work to said support, a block to which said members are pivotally connected, and a rotatable cam engageable with said block for raising and lowering the same.

16. In a broaching machine, the combination with a surfacing element havin a recifrocatory accurately predetermine path 0 travel, a hollow bed, of a work support mounted thereon, members for clamping the work to said support a block to which said members are plvotally connected, a rotatable cam engageable with said block for' raising and lowering the same, and springs for enga g said work clamping members to yielda 1y force the same away from the work when said block is raised.

17. In a broaching machine, the combination with a surfacing element having a recigirocatory accurately predetermined path 0 travel, a hollow bed, of a work support mounted upon said bed, members for clamping the work to said support, a block to which said clamping members are pivotally' connected, a rotatable shaft extending through said block, a cam upon said shaft and engaging in said block, said cam adapted to raise and lower said block upon rotation of said shaft, and a fly wheel upon said shaft for continuing its rotation upon releasing the driving power.

18. In a broaching machine the combination with a surfacing element having an accurately predetermined path of travel, of a work holder, and a support therebeneath, a block formed of yieldable material between said holder and support and holding the same spaced from each other, and means at opposite sides of said block for adjustably moving said holder toward said support and retainin the same in adjusted position.

19. n a broaching machine, the combination with a surfacing element having an accurately predetermined ath of travel, of a bed havin a wall provide with a ortion having an inc ined surface, a wedge-s aped member adjustably enga 'ng said inclined surface, a work holder, a lock of yieldable material between said holder and wedge-shaped member, and means secured to said wedge-shaped member for adjusting said holder relative to said wedge-shaped member and securing the same in ad'usted position.

20. In a reaching machine for hearing or like sections, the combination with a surfacing element having an accurately predetermined path of travel, of a bed having spaced walls, a holder for the hearing or ike section, work engaging clam s and means threadedly engaging said wa ls and contacting with the portions of said holder adjacent to thebearing or like section, to prevent the same from spreading under pressure of said clamps.

21. In-a broaching machine, the combination with a surfacing element having an accurately predetermined path of travel, of a hollow bedhaving side walls and a bottom wall, said bottom wall being provided with a portion having an inclined up er surface, a wedge-shaped member adjusta 1y engagin said inclined surface, a work holder mounte upon said wedge-shaped member, and means threadedly enga 'ng said side walls for adjustin said we ge-shaped member relative to sai inclined surface and for adjusting said work holder relative to said wedgeshaped member.

22. In a broaching machine for bearings, the combination with a holderv for rigidly supporting the work, of a breach for engaging the work, a slide carryin said broach an having a recess in one en thereof, a worm connected to said slide for actuating the same having one end engageable in said recess and havin diametrica 1y opposed slots adjacent to sai end, bars riglldly secured to the front end of said slide an engageable in said slots, said connection permittlng a slight universal movement of the 'worm relative to the slide, and a rotatable threaded member engaging said worm for actuating the same.

- 23. In a broachin machine, the combination with a holder or the work, of a reciprocable slide, a broach carried by said slide for engagin the work comprising a shaft and a plura ity of sets of teeth upon said shaft, a relief cutter carried by said slide having a greater diameter than the teeth of said broach and havin its axis located above the axis of the broac teeth, and means for adjusting said relief cutter relative to said broach. v

24. In a broachin machine, the combination with a holder or the work, of a reciprocable member, a breach comprisin a shaft and a series of teeth) upon said sha t, and a support for said broach secured to said reciprocable member having projections secured to said shaft at spaced points intermediate the length thereof for holding the broach from iongitudinal movement relative to said mem- 25. In a broaching machine, the combination with a holder for the work, of a reciprocable member, a broach comprising a shaft and a plurality of sets of annular teeth upon said shaft, and a support for said broach secured to said reciprocable member having spaced projections secured to said shaft intermediate said sets of teeth and at opposite ends of the same in abutting relation thereto for clamping said shaft in place.

26. In a broaching machine, in combination, a work holder, means for universally adjusting and rigidly supporting said wor holder, a reciprocable member, a broach comprising a shaft and a plurality of spaced sets of teeth arranged in axial alignment upon said shaft, projections carried by said reciprocable member and secured to said shaft at the ends thereof and intermediate the said sets of teeth, means for accurately guiding said member during its reciprocation and means for reciprocating said member.

27. In a broaching machine, in combination, a work holder, means for universall adjusting and rigidly supporting said Wor holder, a reciprocable member, a broach comprising a shaft and a plurality of spaced sets of teeth arranged in axial alignment upon the shaft, means for rigidly securing said I shaft to said member including elements rigidly connected to said shaft at the ends thereof and intermediate the said sets of teeth, means for reciprocating said member and a connection between the said member and means permitting of relative angular movements of the latter. I,

28. In a broaching machine, the combination with a holder for the work, of a reciprocable member a broach comprising a shaft and a plurality of sets of teeth arranged in axial alignment upon said shaft, andmeans engageable with the shaft intermediate the said sets of teeth for securingthe broach I to the said reciprocable slide.

In testimony whereof we afiix our signatures.

- CHARLES W. EGGENWEILER.

WJIILIAM J FIEGEIJ.

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