US1642593A

US1642593A - Broaching machine

Info

Publication number: US1642593A
Application number: US80326A
Authority: US
Inventors: Julian L Perkins; Hiram D Croft
Original assignee: Perkins Machine & Gear Co
Current assignee: Perkins Machine & Gear Co; PERKINS MACHINE AND GEAR Co
Priority date: 1926-01-09
Filing date: 1926-01-09
Publication date: 1927-09-13
Anticipated expiration: 1944-09-13

Description

11,! III I z INfiNTORJI -BY 7 ShetsL -Shet l fill/111,1

I as 7 Eli J. L. PERKINS ET AL.

BROACHING MAcHINE Filed Jan. 9. 1926' Sept. 13, 1927.-

ATTORNEY.

, WITNESS:

Sept. 13, 1927. 93

J. L. PERKINS ET BROACHING MACHINE Filed Jan. 9. 1926 7 shet-sheet' 2 WI-TNESS: '4 11v ENTORS.

@ccr/m/l- A TTORNE Y.

Sept. 13 '1927.

J. LQJPERKINS ET AL BROACHING MACHI-NE Filed Jan; 9. 1926 wENTORIS'I WITNE'SS:

ATTORNEY.

l? -7Ma.m.

Sept. 13, 1927. 1,642 593 J. L. PERKINS ET AL BROACHING MACHINE led Jan, 9, 1926 7 sheets-sheet 5 O O O //0 m /Z0 H6. 6.

INVENTORQ.

WITNESS:

' ATTORNEY.

Patented Sept: "13, 1927..

2 UNITED STATES PATENT OFFICE.

JULIAN I. PERKINS, OF WEST SPRINGFIELD, AND HIRAM I). CROFT, OE SPRINGFIELD, MASSACHUSETTS, ASSIGNORS, BY MESNE ASSIGNMENTS, T PERKINS MACHINE Our invention relates to improvements in machines for cut-tlng, faclng off, or machin I ing plain surfaces, such as the longitudinal edges ofhinge leaves, for example, and

consists generally .of a supporting frame having a base of peculiar construction, vertical plungers or rams provided with means for the attachment thereto and adjustment thereon of series or lines of breaches, there preferably being two of these rams which are arranged in counterbalanced relationship, reciprocating and reversing mechanisms for said rams, work-holders, means for securing the work in place in said holders, and mechanisms for operating said work holders to move the work into and out of the cutting field, together with such other parts and members as may be necessary or desirable in order to render the machine complete and serviceable inevery respect, alias hereinafter set forth.

The'primary object of our invention is to produce a machine, of the class described,

wherewith the opposite, plain sides, edges, or surfaces of Various ob ects can be expeditiously and accurately cut or faced.

Another object is to produce such a machine which is comparatively simple both in construction and operation; strong and durable, and not liable to get out of order.

A further object is to provide the machine with rupturable means to prevent breakage of or other injury to the more essential parts of'the machine, in the event the'chipsare permitted to accumulate in too great quantities beneath the rains.

Still another object is to introduce into the operating mechanism for the work holders means to prevent the latter from being either mechanically or manually moved into the breaching field at inopportune times, or

at such times as would cause breakage or damage to the broaches or other parts.

Other objects and advantages will appear in the course of the following description. A preferred form or embodiment of the invention, whereby we attain the objects and secure the advantages of the same, is illus-. trated in the accompanying drawings, and we will proceed to describe the invention with reference to said drawings, although it .is my be ui ders eod t e for nst SPRINGFIELD, MASSACHUSETTS, A CORPORATION OF BROACHING MACHINE.

9, 1926. Serial no- 80,326.

tion, arrangement, etc., of the parts and members in various aspects, are not material, and may be modified without departure fromthe spirit of the invention.

In the drawings, in which similar reference characters designate similar parts throughout the several views, Figure 1 is a top plan of a broaching machine which embodies a practical form of our invention as aforesaid; Fig. 2, a longitudinal, vertical section throughthe base of the mach ne; Fig. 3,, a frontelevation of said machine; Fig. 4, a left-hand side elevation of the machine; Fig. 5, an enlarged,'to plan of one of the rams and the parts an menibers attached thereto and carried thereby; Flg. 6, an enlarged front elevation of said ram and parts and members, portions being broken away at two places intermediate of the ends; Fig. 7, an enlarged, inner side elevation of said ram, a portion thereof being broken out; Fig. 8, an enlarged, to

plan of the mechanism on the left-hand si s75.

of'the machine for operating the corresponding work holder and the motor reversing mechanism, said work holder being through said holder, takenon the plane of the hand-Wheel axis; Fig. 14, an enlarged, front elevation of said work holder, and, Fig. 15, a front elevation of a piece of work the longitudinal edges of which the machine, in the present example, is set up to finish. 1

The supporting frame of the machine consists generally of a hollow base 1, a superimposed bed 2, the space between said bed and the top of said base being inclosed,

walls being considered as and the inclosin d, brackets 3-3 e tendin parts of the be laterally from both sides of said bed adjacent to the forward 'end thereof, a bracket 4 extending laterally from the bed' adjacent to the rear end thereof, and a column 5 rising from the bed some distance back from its front end. The rear end portion of the bed 2 is lower than the forward portion thereof, and the brackets 3 are secured to the sides of the higher portion, the column 5 rises from the said higher portion, and the bracket 4 is secured to the leftrhand side of the lower portion of said bed.

Covers and doors are rovided as usual for the purpose of aifor ing access to the interiors of the base 1 and the bed 2, two of such covers appearing at 6 for the base, and

7 four of such doors appearing at 7 3, and 9 for the bed. The base 1' extends forwardly beyond the front end of the bed 2, and the covers 6 are over such projecting part, as shown in Figs. 3 and 4, these covers being omitted from Figs. 1 and 2. The doors 7, two in number, are on the front of the bed 2, as shown in Figs. 3 and 4, and the

doors

8 and 9 are on the lefthand side of the higher and lower portions, respectively, of said bed, as shown in Fig. 4. There are also doors (not shown) similar to the

doors

8 and 9 on the opposite side of the bed.

In addition to the bracket 3, on each side of the bed 2, there are two brackets 10 and 11 secured to such side below said fii'stnamed bracket, the bracket 11 being back of the bracket 10. 1

An electric motor 12, which furnishes the motive power for the machine, is mounted on the bracket 4, and a transmission case 13 is mounted on the lower part of the bed 2. The motor 12 has a shaft 14 with a gear 15 thereon at the right-hand terminal, and said gear intermeshes with a gear 16 on a shaft 17' journaled in thecase 13, both of these shafts being transversely arranged relative to the machine. A longitudinal shaft 18 is journaled in suitable hearings in the column 5 and the case 13, and driven from the motor 12, through the medium of the shafts 14 and 17, the gears 15 and 16, andthe transmission mechanism in said case. Secured to the forward end of the shaft 18, in front of the column 5, is a gear 19. There is a box 20 on the left-hand bracketv 3 at the rear end thereof, for motor-reversing mechanism connected by suitable electrical conductors with the motor 12. This reversing mechanism for the motor is such as is commonly employed for the purpose, and includes a shaft 21 which projects beyond the right-hand side of the box 20, and a. gear 22 secured to said shaft on the protruding terminal thereof.

On the front of the column 5, adjacent to the sides thereof, are two vertical T-shaped guides 23 for the same number of plungers or rams 24, said rams having longitudinal channels in their back sides to receive aeaaeee said guides, and being held in sliding relationship to said guides by means of pubs 25, in the customary manner. A pair'of gibs 25 is secured to each ram 24 on the back side.

Secured to the adjacent sides of the rams 24 are two vertical racks 26 with which the gear 19 intermeshes. Obviously, when the gear 19 is rotated in one direction it acts, through the medium of the racks 26, to carry one of the rams 24 upwardly and the other downwardly, and, when said gear is rotated in the opposite direction, it acts through the same medium to reverse the movements of said rams. 4

' Mounted on top of the column 5, behind the vertical plane in which the guides 23 are located, are two brackets 27, and each of these brackets is provided with an axle 28 on which is mounted a sheave 29. Passing over the sheaths 29 and extending downwardly therefrom is a chain or cable 30. Each end of the cable 30 is secured to the head of a vertical bolt 31 that is received in a lug 32 on the back side of the outer gib 25 secured to one of the rams 24. Each bolt 31 has a nut 33 thereon below the lug 32 through which said bolt extends, whereby means is provided for adjusting the bolt vertically for the purpose of taking up wear, and rendering and keeping the cable 30 taut. Thus means is provided whereby each ram has a counterbalancing effect on the other ram, to the end that the reciprocating movepuen; of said rams is facilitated and stabiize Secured to the outer side of each of the rams 24 are upper and under

cam plates

34 and 35, respectively. The plate 34, on each ram 24, is secured to said ram near the top thereof, projects rearwardly across the outer edge of the contiguous gib 25, and has a downwardlyand rearwardly-extending flange 36. The plate 35, on each ram 24, is secured to said ram near the bottom and adjacent to the front side thereof, and has an upwardlyand forwardly-projecting flange 37. Each cam plate (34 and 35) is bolted to its ram, and has on' the inside face a rib 127, shown intop plan in Fig. 5, that fits into a slot in saidram to assist in holding said plate in place. f

The rams 24 move a and down in the spaces in the bed 2 and t e base 1, and carry the tools with which the breaching is done,

conseijjuently considerable quantities of oil and c ips fall into the pits in said base below sai rams. These pits are indicated by the numeral 38, in Fig. 2, and each as shown has a floor which inclines upwardly, and rearwardl and forwardly from a central portion w ich is level. The covers 6 afford access to two compartments 39 below in the front art of the base 1. The floor of each of tiese' compartments at its inner edge forms a junction with the front edge of the floor of the pit es behind and below,

above.

and said first-named floor adjacent to said junction is provided with a series of short,-

upstanding projections or teeth 40, the rear edges of which have the same inclinations and are in the same plane with the upper surface of the forward .inclinedpart of the floor of said pit.

When;it.is necessary to remove the accumulation of chips from the pits 38, the covers 6 are removed, a suitable implement is inserted first into the open top of one of the compartments 39 and down into the associated pit; "and then into the open top of the other compartment 39 and down into the associated pit, and the chips are raked up onto the floors of said compartments, where the teeth 40 prevent them from being washed back into said pits with the oil which drains out of said chips and flows back between-said teeth into said pits. Sub- 'sequently the chips in the compartments 39 are shoveled out of the top thereof.

A breakable late 41 is provided beneath each ram 24. Jach plate 41 is supported atan incline on the level floor of the pit 38 by means of a rib 42 rising from said floor, said plate having at the rear end a downwardly-extending flange 43 to hook over. said lug. ,The'plate 41 at the forwardend rests on the floor of the pit 88. The plate 41 is of such dimensions and made of such material that the same can be broken with comparative ease, consequently,'in the event the chips be permitted to accumulate in the pit 38 beneath either ram 24 to an extent that would tend to interfere with the movement of said :ram, or produce breakage or other damage'to the ram and the operating mechanism therefor, said ram in descending operates, through the intervening mass of chips, to cause the plate below to be broken. When the plate 41 breaks, a sound or noise is produced which serves to arouse the attention of the operator, and

.warns him to-stop the machine. and remove the excessive accumulation of chips.

breaking of the plate 41 occurs before the- The accumulation of chips is sufficient to do any serious injury or damage, or even interfere with the proper operation of the ram Extending vertically through the center of each ram 24 is a channel 44 for a hard ened, wearing'and guide bar 45, which bar is secured by screws or other means to said ram. Inthe front faceof the bar 45 is a longitudinal channel 46 having outwardly flaring sides and adapted to receive therein a similarly shaped part 47 at the rear end of a female work-holding block 48 which will hereinafter be described.- Thebar 45 receives the thrust from the block 48, assists in guiding and steadying the parts during the times said block is in contact means therefor.

therewith, andis hardened to enable it to withstand the-"wear incident to the frictional engagement between the bar and block. T

On the front of each ram-24, equidistant from the transverse, vertical, central plane of said ram, are broach holders consisting of two inset walls, and forwardly-extending vertical flanges 4949. These flanges do not extend clear to the top and bottom of the ram 24, and their adjacent, inner faces are parallel with each other, and extend back to the faces of the aforesaid inset walls, 'with which faces the foremost edge portions of the thrust bar 45 are flush, as clearly shown in Fig. 5. The two-sided abutments or holders thus formed, on each side but forward of thebar 45, are for.

broaches 50 and securing, and adjusting In this machine each ram 24 is equippedwith eight broaches 50, four on eachsicle of the channel designated at I 51, provided between them for the work, and which channel in width is approximately that of the bar 45.- 7

Each broach 50 is secured to its holder. on one side or the other of the work channel 51, after proper adjustment, by means of two bolts 52. Each bolt 52- passes through atransverse slot 53 in the broach 50 into a tapped hole or opening behind the inset face of the holder for .said broach.

Washers, as 54, may be employed in conmotion with the bolts 52 for securing the broach in place. The broaches 50 are arranged in parallel sets or lines, end to end in each line, and with the teeth of the broaches in one line adjacent to the teeth of the broaches in the other line. These two rows of teeth define the work channel 51.

It is necessary that the lowermost teeth of the broaches 50 in the two lines he farther apart than the uppermost teeth of such broaches, and that the intermediate teeth be on planes connecting said lowermost and uppermost teeth, consequently said broaches must be set to diverge slightly from to to bottom, and it is topermit this to be one that the transverse slot 53 is provided for each bolt 52. The bolts 52 are augmented by abutments or thrust blocks 5555 in holding the two lines of broaches against upward displacement. The blocks 55 are bolted or otherwise secured to the inset faces of the broach holders immediately above the uppermost broaches 50. Before the bolts 52 are tightened, the broaches 50 are adjusted by means of two pairs of

wedges

56 and 57.

One of the wedges 56 is secured by screws or other means against the inner side of .each flange 49, with the wide end down. The wedge 56 extends above the top plane of the adjacent thrust block .55, and projecting from the exposed face of such upper portion of said wedge are two lugs 58. One of the wedges 57 is inserted, small end down, between each wedge 56 and the adjacent line of broaches 50, and is adjusted vertically by means of a vertical screw 59. The screw 59 is provided with a cylindrical projection or nut 60 located between the lugs 58, which latter are slotted to enable said screw to be inserted in said lugs through the edges thereof that are parallel with and adjacent to the central, vertical, transverse plane of the ram, with said nut between said lugs and the head of the screw above the upper lug. The screw 59 is tapped into the wedge 57 below, and has a checknut- 61 thereon above the upper lug 58. If,

while the check-nut 61 is loose, the screw 59 be rotated in one direction, the wedge 57 with which said screw is in engagement is forced downwardly, and, if said screw be ro tated in the opposite direction, said Wedge is elevated, these movements on the part of the wedge being due to the fact that the screw is prevented by the nut 60 and the lugs 58 from moving lon 'tudinally. After the wedge 57 has been ad 'usted to the required extent by its screw 59, the check-nut 61 is tightened on said screw against the top of the upper lug 58 to hold said screw in place against accidental rotation. There must, necessarily, be sufficient clearance between each wedge 57 and the adjacent thrust block 55. The wedges 57 are first adjusted to locate the breaches 50 the proper distance apart to accommodate them to the work, and then the bolts 52 are tightened. Thus the breaches 50 are supported from above by the thrust blocks 55, and at their outer edges by the

wedges

57 and 56 and the flanges 49, and are secured against the inset faces of the broach holders by the bolts 52 and washers 5-i.- The wedges should be so proportioned that the lines of breaches 50 in each pair diverge slightly from top to bottom, regardless of the adjustment imparted to them by the wedges 57, being farthest apart at the bottom and nearest together at the top, so that the separation at the bottom is approximately equal to the width of the work to be broached, and the separation at the top is equal to the width of the work after it is broached, that is to say, of the finished work. This machine, as ere presented, is adapted to broach the opposite edges of hinge leaves, one of such leaves being represented at 62 in Figs. 12 and 14.

The inclinations of the lines of wedges in each pair are determined by the taper of the wedges 57, while the width of the space between said sets of breaches, or of the work channel 51, is dependent on the position of said wedges vertically. By operating the screws 59 to force the wedges 57 downwardly, the broaches 50 in contact with said wedges are moved closer together, and, by

eaatoa rotating said screws in the direction to elevate said wedges, said broaches are permitted to'be moved farther apart, such adjustments being made while the bolts 52, as well as the check-nuts 61, are loosened. For work narrower than the hinge leaf 62, the broachcs 50 in each pair of broach holders must be set nearer together, and, for work which is wider than said leaf, said broaches must be set farther apart. If, for any reason, it be desired to change the inclinations of the broaches 50, wedges having different tapers from the wedges herein shpwn would have to be substituted for the latter.

It is preferred to employ a plurality of short breaches in a line, rather than one long broach, because the short breaches can be repaired more readily, and they are more economical and generally superior in all respccts.

A work-holder is required to cooperate with each of the rains 2st, and such holder must be adapted for the easy and quick insertion therein and removal therefrom of the work, and provided with means for easily and quickly securing the work in place and releasing it. These two work holders must also be capable of being thrown into and out of operative position relative to the rams 2d, the conditions required being that one holder shall be in operative position while the rain behindit is descending, and at the same time the other holder shall be in inoperative position while the ram behind it is-ascending, and vice versa. In the general views the left-hand Work holder is shown in" its inoperative position and the right-hand work holder is shown in its operative position, the left-hand ram 2 1 being down and-the right-hand ram 24 being up. Referring now especially to Figs. 11,12, and 13, we will describe the work holder therein illustrated. It is understood that both work holders are alike.

Mounted on and secured to a rock shaft 630 is a carrier 64 extending through which from the front to the back side is a rectangular opening 65. Fitting within the opening 65, and secured therein by means of two bolts 66, is the female clamping block 48. The block 48 is bifurcated to form upper and under arms or extensions, and at the rear end inside is shaped to receive and support the convex side of the hinge leaf 62. The free ends of the clamping-block arms are directed forwradly, the lower arm rests on the bottom of the opening 65, and the bolts 66, which are tapped into and through the top of the carrier 64-, are screwed down tightly onto the top of the upper arm. A male clamping block 67' is located in the female block 48, and adapted by location and construction to engage from the front the leaf 62 and hold the same in position in said female block, the rear end of said male block being shaped to engage the concave side of said leaf. As means for forcing the block 67 tightly against the leaf 62 and withdrawing said block from clamping position, a bearing block 68 and a screw .69 provided with a hand-wheel 70 are employed. In the inner sides atthe top and bottom of the female clamping-block arms are two transverse slots 71. The bearing block 68 fits between the arms of the block 48, and on the top and bottom of said bearing block are transverse ribs 72'72 which fits within the slots 71. By this means and in this manner the block 68 is held against displacement either forwardly or rearwardly in the'block 48, and said block 68 is held against displacement laterally by the sides of the opening 65. The clamping block 67 is held against lateral displacement by the sides of the opening 65. The screw 69 is tapped into and through the bearing block 68, and has at the rear end an enlargement or nut 73 that is received in a recess 79 in the clamping block. 67,-such recess being in the center of the front side of said clamping block, whereby thelatter is moved forwardly or rearwardly by said nut when said screw is rotated and according to the direction of rotation. I At the outer terminal of the screw 69 is a square head 74, and the hand-wheel 70 has a square opening in the hub thereof, which 0 ening is slightly larger than said head. he head 74 is received in the opening 75, and a check-nut 76 is screwed onto a screwthreaded projection 77 at the extreme front end of the screw 69, to retain the handwheel 70 in place on said head. The check nut 76 prevents the hand wheel 70 from being withdrawnfrom the head 74 in a forward direction, and a flange 78 on the screw' 69 behind said head prevents said handwheel from moving rearwardly on said head.

In assembling the parts and members of 'each work holder, the bearing block 68 is laterally inserted in place in thefemale clamping block 48,- the latter is inserted in the opening 65, the screw 69 is introduced into said bearing block, said clamping block is positioned rearwardly in the carrier 64 far enough to enable the 'male clamping block 67 to be laterally inserted in said female clamping block, when the nut 73 is received in the opening or slot 79 prepared for the same in said male clamping block, which slot extends through from side to side of the block and opens through the front end thereof, and finally thefemale clamping block is drawn forward to the required extent in said carrier and secured by means of the bolts 66. It is assumed that the hand-wheel 70 has been mounted on the head 74, and the check-nut 76 screwed onto the projection 77.

When the screw 69 is rotated'in one direction, it moves rearwardly or inwardly and which slides in the space betwen the arms of the female clamping block 48, and, when said screw is rotated in the other direction,

it moves forwardly-or outwardly and carries with it said male block. When the block 67 is moved forwardly by the screw 69 far enough to receive in the space between the back end therof and the adjacent surface of the block 48 the leaf 62, said leaf is inserted sideways into such space, and then said screw is rotated in the'direction to force said block 67 rearwardly into clamping engagement with said leaf. The leaf 62 is, of course, wider than the width of either of the

blocks

48 and 67, and must be arranged in said first-named block to project an approximately equal distance on both sides of the same. To release the leaf 62, the screw 69 is rotated in the direction to move forwardly with the block 67. The leaf '62 can now be removed sideways from the block 48.

The'opening 75 is made larger than the head 74 for the purpose of enabling a sudden and comparativel powerful impulse or blow to be imparted by the hand-wheel 70, at the end of the rotation thereof in the direction to clamp the work in place, and

again at the beginning of the rotation thereof in the direction to release said work. In short, a hammer blow is or may be im parted. by the hand-wheel at the end of the clamping operation, and again at-the beginning of the unclamping operation.

For work of different shapes and sizes, difl'erent clamping blocks are required, but otherwise the work holder remains unchanged. Usually it is only the rear end of the male clamping block and the adjacent surface of the female clamping, block that have to be changed in order to be accommodated to work of other shapes and sizes.

Each work-holder carrier 64 is provided.-

with a split sleeve 80 which is clamped on to the rock shaft 630 by means of two bolts 81. Upon loosening the bolts 81 the carrier 64 can be adjusted on the rock shaft 630, after which said bolts are again tightened.

' There being two work holders which operate independently of each other, there must be two rock shafts 630, and these two shafts are journaled in

bearings

82 and 83 on "the bed 2 forward of the column 5 and the parts and members supported and carried thereby. *The bearings 82 are adjacent to the sides of the bed 2, while the bearings 83 are adjacent to the transverse, verti cal, central plane of said bed. There is a bearing 82 and a bearing 83 for eachshaft 630, and the former is longer than the latter.

' When either work holderis thrown rear-' wardly into operative position, the rear end against the said bar, and the work or leaf 62 in said block is located below, in, or above, according to the position of the associated 'ram 24, the passage or channel 51 between the two lines of breaches 50 with which said a ram is equipped. At this time the work holder is erect, and when sodisposed the portion of the same which is behind the vertical plane of the axis of its rock shaft 630 is considerably heavier than the portion of the same which is in front of said plane, The tendency of the work holder, when in operative position, is, therefore, to gravitate toward the ram 24 behind. When the work holder is thrown forwardly and downwardly into inoperative position, the supporting end 17 of the block 28 and the work are removed entirely from the channel 46 and passage 51. A stop 84:, Figs. 3, 9, and10, is provided for each work holder. These stops are bolted or otherwise secured at their bases to the topv of the bed 2 adjacent to the front edge thereof, and extend upwardly and rearwardly into position to be contacted with by the front ends of the carriers 64, when the work holders are swung forward into inoperative pos1t1on,- sa1d carriers then coming to rest directly against the free ends of said stolps.

t is necessary to provide mechanism for simultaneously actuating the work holders in opposite directions, so that one work holder is rocked into operative position while the other work holder is rocked out of such osition, and vice versa. There must also be provided mechanism for operating the motor-reversing mechanism in the control box 20, each time the rams 24 arrive at the extreme ends of their travel, to reverse the direction ofithe driving mechanism for said rams, so that when the left-hand ram arrives at its highest point and the right-hand ram arrives at its lowest point, their directions are reversed, and again their directions are hub being adjustably secured to'said shaft by means of a bolt 87 The arm 85 extends downwardly from its shaft 630, and at the lower terminal has a transverse pin or pivot 88. Mounted at its forward terminal on the pin 88 is a link 89 having a downwardlyextending part 90 at the rear terminal to eaaaee form a hook. Also mounted at its forward terminal on the pin 88 is a thrust arm 91, on the outer side of which is a roll 92 loosely mounted on astud 93 which extends outwardly from said arm near the rear end thereof. The bottom end of the rocker arm 85 is bifurcated, and the forward terminals of the link 89 and the thrust arm 91 are mounted on the pin 88 between the bifurcated parts of said rocker arm. Loosely mounted on the pin 88, outside of the arm 85, is a hub 94 having a downwardly-extending dog 95 and an upwardly-extending finger 96. The arm 85 is provided on the outer side, in front of the upwardly-extending finger 96, with an angular lug 97, and said finger is yieldingly retained in contact with the rear end of said lug, by means of a spring 98having its ends respectively fastened to the approximately vertical part of said lug and to a pin set in the upper end of said finger. The spring 98 normally retains the dog 95 in position to engage a finger 99 that extends upwardly from the top of a trip 100 into the path of said dog. 1

The trip 100 has upwardly and rearwardly-extending arms, and is pivotally connected at 101 with the bracket 10 on the left-hand side of the bed 2. In the trip 100 is a notch 102. The notch 102 is located at the base ofthe finger 99 behind the same, in position to receive a pin 103 which projects outwardly from an approximately horizontal hand lever 104. A spring 105, having its upper and lower ends respectively fastened to the rear end of the rearwardly-extending arm of the tri 100 and to the rear end of a horizontal olt 106 secured to the bracket 10 below said trip, has a constant tendency to swing said arm downwardly and the finger 99 rearwardly. The lever 104 has its rear terminal pivotally connected at 107 with the bracket 11 which is behind the bracket 10. The front terminal or handle of the lever 104 extends beyond the front of the bed 2 into a convenient position to be grasped by the hand of, the operator. A vertical guide plate 108, for the lever 104, is supported from the adjacent side of the bed 2 inposition to relieve said lever from lateral strain toward said bed, when said lever is grasped at the front end by the operator standing in front of the machine, and swung upwardly. Upon the forward movement of the rocker arm 85, the parts being disposed as in Fig. 9, the dog 95 is moved into contact-with the upper end of the trip finger 99, and .thereby causes the trip 100 to be rocked against the resiliency of its spring 105, because the finger 96 is in contact with the lug 97 and sa1d dog thereby-prevented from yielding under the impact of the same with said trip finger. The dog 95 is carried by the arm 85 forwardly. beyond the finger 99, into the position which it occupies in Fig. 10.

"When thetr-ip 100 is thus rocked on its pivot 101, the notched part at 102 passes from beneath the pin 103, andthe lever 104 is permitted to swing downwardly on itspivot 107, from the position which said lever occupies in Fig. 9, to the position -which it occupies in Fig. 100, said pin coming and, since the rear terminal of the thrust arm 91 is supported by said roll on said lever, said arm swings downwardly on the pin 88 into inoperative position when said lever descends, and When'said lever is elevated said arm is again raised into operative position. The arm 91 limits the upward movement of the leve'r104. vUpon the rearward movement of the arm 85, the dog 95 strikes the finger 99, which has been carried back into the path of said dog, but the contact this time is ineffectual, because the spring 98 yields and permits said dog to snappast said finger. The parts are now and again positioned as in Fig.9.

Secured to the top of each bracket 3 is a bearing 109, and secured to the top of the bed. 2 adjacent to each longitudinal edge thereof is a bearing 110.- The axes of the four

bearings

109 and 110 are in line with each other. Journaled in each pair of asso- .

ciated bearings

109 and 110 is a horizontal rock shaft 111. Secured on each rock shaft each rock shaft 111 in front of the bearing 110 for such shaft, by means of a bolt 115. Loosely mounted on each rock shaft 111, in front of the shock-absorber 113, is an operating rocker arm 116 for the rocker arm 85 in front. The arm 116 is approximately diametrically opposite to the associated arm 112. The arm 112 has a generally upward direction and the arm 116 a generally downward direction. In addition to these parts and members mounted on each rock shaft 111, there is a reversing rocker. arm 117 119 which projects inwardly from said arm.

The roll 118 is in the paths of the

flanges

36 and 37 of the

cam plates

34 and 35.

Each shock-absorber .113. is provided at each end on opposite sides of its rock shaft 111 with a recessed .holder 120 for a spring 121, such holder opening through the bottom. Each rocker arm 116 is provided' on opposite edges with lugs 122-122 which extend beneath the adjacent-shock-absorber holders 120, to receive the lower ends of the springs 121. The rocking movementimparted to the shaft 111 from the arm 112 is transmitted to the arm 116 through the shock-absorber 113 and the springs121, instead of being transmitted directly, and undue shock and jar and liability of breakage are thereby avoided. When the arm 112 is rocked rearwardly on and with the shaft111, it carries with it the shock-absorber 113, and the lefthand spring 121 yieldingly imparts forward movement to the arm 116; and, when said first-named arm is rocked forwardly,'yielding rearward movement is imparted to said arm 116, through the medium of the righthand spring 121.

Each rocker arm 116 is bifurcated at the lower end .and provided with a transverse pin 123, and the associated link 89 is hooked 90 being behind saidpin. Therear end of the arm 91 associated with each arm 116 is adapted to be thrust up under the link 89 in front of the pin 123.

The rocker arm 112,which is associated with the reversing rocker arm 117, is'provided on the back edge with upper and under lugs 124 thatextend above and below said reversing arm, and carry bolts 125-125. The inner ends of the'bolts 125 bear on the upper and under edges of the arm 117, and by means of said bolts the position of said arm relative to the arm 112 may be changed and regulated. Atthe rear end of the arm 117 is a toothed segment 126 which intermeshes with the reversing-mechanism gear 22, said arm being forward of said gear.

'The arrangement, construction, and tim ing of parts are suchthat, when the arm 112 is rocked rearwardly, the arm'117 is rocked downwardly and corresponding motion is imparted to the gear 22 by means of the toothed segment 126; and, when said arms are rocked in the opposite directions, said segment imparts motion inthe opposite direction to said gear.

The parts and members illustrated in Fig. 9 have just been actuated into the positions which they there occupy by the cam-plate flan 'e36, at the end of the downward stroke of t e left-hand ram 24, and the left-hand work holder has been actuated into inoperative or loading and unloadingposition. When this ram ascends and approaches the end of its upward travel, the cam-plate flange 37 encounters from the front the roll 118, and actuates the arm 112 rearwardly, with the result th at the parts and members of the operating mechanism for the lefthand work holder are caused to assume the positions which they occupy in Fig. 10, and

'over; said pin in said bifurcation, the part said'work holder is actuated into operative or broaching position. At the same time the reversing arm 117 is swung downwardly to change the direction of the reversing mechanism for the motor. These results are brought about by the rocking motion imparted to the shaft 111 by the arm 112, and through the medium of the shockabsorber 113, and the lugs 124; and bolts 125. The arm 116 in its forward movement carries with it the thrust arm 91 with which the pin 123 is in contact, and saidsecondnamed arm imparts a forward movement to the arm 85, and thereby causes the shaft 630 to rock and carry the work holder rearwardly into operative position. In movingforwardly with the arm 85, the dog 95 encounters the finger 99 of the trip 100 and releases the pin 103, andthe lever 104i swings downwardly and with it the thrust arm 91. As soon as this occurs, or at any time before the ram arrives at the lower end of its travel, theoperator grasps the handle of the lever 10 1 and resets the same and with it the arm 91'. It is clear from the foregoing that, by the time the ram arrives at its lowest point, the associated work holderris in inoperative position, and, when suchpoint is reached, the direction of said ram is reversed. a

, As the left-hand ram, 24 approachesthe lower end of its travel, the cam-plate flange 36 encounters from behind the roll 118, and causes the arm 112 to be rocked forward until it occupies the position shown-in Fig. 9 and the general views. The left-hand ram is now at its lowest point. The arm 112, when actuated by the cam plate 34, imparts an upward movement to the arm 117 and thus brings about a reversal of the motor; and imparts a rearward movement to the arm 116, which movement is transmitted, through the pin 123, the link 89, and the pin 88, to the arm 85, with the result thatthe right-hand work holder is rocked forwardly into inoperative position. During the rearward movement of the arm 85, the spring 98 yields to permit the dog to snap by the finger 99, provided the arm 1045and the trip 100 have been reset. v

As the left-hand ram 24.- approaches the upper end of its travel, the cam-plate flange 37 encounters from in front the roll 118, and causes the arm 112 to be rocked rearwardly until it occupies the position shown in Fig. 10. The left-hand ram is now at its highest point. The arm 112, when actuated by the cam plate 35, imparts a downward movement to the arm 117 and thus brings about another reversal of the motor; and imparts a forward movement to the arm 116, which movement is transmitted,

through the pin 123, the thrust arm 91, and c the pin 88, to the arm 85, with the result that the right-hand work holder is rocked te races rearwardly into operative position. During this time the dog 95 causes the trip 100 to release the lever 10 1.

Corresponding operations of the actuating mechanism for the right-hand work holder take place concurrently with those of the actuating mechanism for the lefthand work holder, but in reverse directions, whereby said right-hand work holder is thrown into operative position when said left-hand work holder is thrown out of operative position, and vice versa.

If, for any reason, either lever 104 be not raised to locate the thrust arm 91 supported in partthereon in operative position in front of the associated pin 123, during the time it takes the cooperating ram to ascend, the forward movement imparted to the rocker arm 116 with which said, thrust arm is pivotally connected, when the flange 37 of the cam plate 35 on said ram encounters the roll 118 in the path of said flange, is ineffectual so far as the rocker arm 85 on the same side of the machine is concerned, because the pin 123 carried by said arm 116 then rides idly forward beneath the link 89 resting on said pin, and the work holder on that side remains in its inoperativeposition, The link 89 always operates, however, to rock the arm 85 rearwardly, when said arm is forwardly disposed and the arm 116 is rocked in that direction, that is, rearwardly.

The means just described, whereby free forward movement is permitted to each arm 116, when the associated thrust arm 91 is down in inoperative position, without move ing of the arm 85 associated with said arm 116, prevents the work holder operated by said arm 85 from being automatically or mechanically actuated into operative position at the wrong time. And it is desirable, not to say necessary, to supplement the aforesaid preventative means with means to prevent the operator from manually moving the work holder int-o operative position while the thrust arm 91 is out of engagement. with the pin 123. To this'end the arm 91 may have an extension 128 in front of the pivot 88, and there may be an abutment 129 on the adjacent side of the bed 2 to cooperate with said extension. Theextension 128 is at the front end of the arm 91,

and at the front end of said extension is a lug 130, best shown in Fig. 11, that projects inwardly beyond the arm 85, atthe lower end, with which arm 85 the thrust arm is pivotally connected, and the abutment 129 is in the path of said lug, when the thrust arm is in inoperative position, but does not project far enough from the bed 2 to'interfere with the forward movement of said 1 arm 85. The bottom of the abutment 129 is inclined from the rear end upwardly and forwardly, as represented at 131.

The extension 128 with its lug 130 and the 85 which supports said thrust arm is rocked forwardly, said lug clears the abutment 129, the lug passing beneath the same; but, when said thrust arm is out of operative position, said extension is disposed with its lug in position-behind said abutment to prevent said arm 85 from being swung forwardly, in the event the operator attempts to rock the work holder above into operative positionsee dotted-line position of the thrust arm in Fig. 9.

If for any reason the thrust arm 91 be left in inoperative position, as shown in Fig. 10, at the time the flange 36 of the upper cam plate 34 causes thearm 116 to be rocked rearwardly, no harm will result, because then and in that event, as the link89 car-- ries the arm85 rearwardly and with it said thrust arm, the lug 130 encounters the inclined bottom 131 of the abutment 129 and rides beneath the same, imparting on the way merely an upward swing to the thrust arm, which then drops down again onto the lever 104.

Assuming that the broaches 50 are secured in place, after proper adjustment, in the broach holders on the rams 24, and that the motor 12 is set in motion, the operation of the machine as a whole is briefly described as follows.

As the right-hand ram 24 descends its broaches 5 out both of the exposed and protruding, la eral edges of the hinge leaf 62 which is in the right-hand holder, and during the descent of said ram the left-hand ram 24 ascends, and the operator removes the finished hinge leaf 62 from and inserts and fastens anunfinished leaf in the lefthand work holder. At the arrival of the left-hand ram at its highest point and the simultaneous arrival of the right-hand ram at its lowest point, the left-hand work holder is thrown rearwardly into operative position and the right-hand work holder forwardly intoinoperative position, and the direction of. the gear 19 which drives the rams is reversed, all by the means and in the manner hereinbefore explained in a detail. The operator raises the right-hand lever 104, and replaces the finis'hed leaf 62 with an unfinished leaf in the right-hand work holder. Upon the arrival of the leftand the right-hand rams at their lowest and highest points, respectively, their directions are reversed, the left-handwork holder is thrown out and the right-hand work holder is thrown in. The operator raises the lefthand lever 104, and removes the finished leaf 62 from the left-hand work holder and inserts in place thereof an unfinished leaf.

And so the operations continue indefinitely. whereby said holders,

equipped with a line of broaches, or the outermost broach holders onthe two rams might be so equipped; or the innermost broach holders on the two rams might be equipped.

The broach teeth may be shaped to cut grooves-in the work, as well as to plane ofl the same.

WVhatwe claim as our invention, and desire to secure 'by Letters Patent, is

1. In a breaching machine, vertical re-1 ciprocating rams adapted to carry broaches on the sides thereof, and work holders adapted to be moved into and out of operative posit-ion relative to and into contact with said sides of said rams, holders, when in contact with said rams, are partially supported-thereby, and position the work in the cutting field, and, when out of said operative position, are unsupported by said rams, and position said work out of said field.

2. In a broaching machine, vertical reciprocating rams adapted to carry broaches and out of'operative position relative to and into contact with said sides of said rams, whereby said holders, when in contact with said rams, are partially supported thereby, and position the work in the cutting field, and, when out of said operative position, are unsupported by said rams, and position said work out of said field.

3. In a broaching machine, vertical reciprocating rams adapted to carry broaches on the sides thereof, work holders and means simultaneously to actuate said work holders alternately into and out of operative position relative to and into contact with said sides of said rams, whereby said holders,

when in contact with said rams, are partially supported thereby, and. position the work in the cutting field, and, when out of said operative position, an unsupported by said rams, and position said work out of said field.

4. In a broaching machine, vertical reciprocating rams adapted to carry broaches on the sides thereof, means to actuate said rams simultaneously in opposite directions,

-work holders, and means simultaneously to actuate said work holders alternately into and out of operative position relative to. and into contact with said sides of said rams,

when in contact with whereby said said rams, are partially supported thereby, and position the work in the cutting field, and, when out of said operative position, are unsupported by said rams, and position said work out of said field.

5. In a breaching machine, vertically reciprocating rams adapted to carry breaches on the sides thereof, and oscillatory work holders adapted to be rocked into and out of operative position relative to and into contact with said sides of said rains, whereby said holders, when in contact with said rams, are partially supported thereby, and position the work in the cutting field, and, when out of said operative position, are unsup orted by said rams, and position said wor out of said field.

6. In a breaching machine, vertical rains adapted to carry breaches on the sides thereof, means to actuate said rams simultaneously in opposite directions, oscillatory work holders, and means simultaneously to actuate said work holders alternately into and out of operative position relative to and into contact with said sides of said rams, whereby said holders, when in contact with said rams, are partially supported thereby, and position the work in the cutting field, and, when out of said operative posit-ion, are unsupported by said rams, and position said workout of said field.

'2'. In a breaching machine, constantly reciprocating rams adapted to carry breaches on the sides thereof, oscillatory work holders, and intermittently operating means simultaneously to actuate said work holders into and out of operative position relative to and into contact with said sides of .said rams, whereby said holders, when in contact with said rams are partially supported thereby. and position the work in the cutting field, and, when out oi? operative positien, are unsupported by said rams, and posit-ion said work out of said field.

8. In a breaching machine, vertical rams adapted to carry breaches on' the sides thereof, means to actuate said rams simultaneously in opposite directions, work holders, and means to move one of said work holders into and the other of said work holders out of operative position relative to and into contact with said sides 'of said rams, each time the rams arrive at the approximate limits of their travel, whereby.

said holders, when in contact with said rams, are partially supported thereby, and position the work in the cutting field, and, when out of said operative position, are unsupported by said rams, and position said work out of said field.

9. In a breachingw machine, a supporting in said base beneath said ram, said member being adapted to be broken in the event chips accumulate between said member and said ram to an extent thatwould ,be liable to injure the machine or its parts in the absence of the member.

10. In a breaching machine, a supporting frame consisting in part of a hollow base having therein a pit in which. is a rib, a breakable plate supported with one edge portion on the floor of said pit, and with the opposite edge portion on said rib, and a reciprocating breach-carrying ram supported by said frame and operating in and out of said base "above said plate.

11. In a breaching machine, a vertical reciprocating ram provided with a wearing and guide bar and with breach holders on opposite sides of said bar, means to secure two lines of breaches to and intermediate of the ends of said holders, with a work chan nel between, and a work holder having a part to bear against said bar and support the work in said channel.

12. In a breaching machine, a vertical reciprocating rain provided with a longitudinally-channeled bar and with breach holdare on opposite sides of said bar, means to secure two lines of breaches to and intermediate of the ends of said holders, with a work channel between, and a work holder having a part which is adapted to project into the bar channel and bear against said bar, and a part to support the work in said work channel.

13. In a breaching machine, a vertical re-- ciprocating rain provided on one side with a vertical broach holder, a wedge secured to one side of said holder, a second wedge in contact with the first, means to adjust said second wedge longitudinally, and means to support breaches for adjustment in the direction of their breadth and with their plain longitudinal edges in contact with said second wedge.

14. In a breaching machine, a vertical reciprocating ram provided on one side with a vertical breach holder, a wedge secured to one side of said holder, and provided with lugs, a second wedge to cooperate with the first, a bolt passing through said lugs into threaded engagement with said second wedge, and having an enlargement between said lugs, and means to support breaches for adjustment in the direction of their breadth and with their lain longitudinal edges in contact with sai second wedge.

15. In a breaching machine, a vertical reciprocating ram provided on one side with a vertical breach holder, a fixed thrust block secured to said holder in position to receive the upward thrust from a line of breaches below, means to support said breaches for adjustment in the direction of their breadth, and an adjustable wedge between-one side of said holder and the adjacent edges of said broaches.

16. The combination, in a broaching machine, with a vertical reciprocating ram provided on one side with vertical broach holder, bolts projecting from said holder, a fixed thrust block secured to said holder above said bolts, and wedges supported from said, holder, one of said wedges being adjustable, of broaches slotted in: the direction of their breadth to receive and be adjustable on said bolts, abutting with their longitudinal plain edges one of said wedges, and held in place from above by said block.

17. In a broaching machine, a vertical reciprocating ram provided on one side with vertical broach holders spaced apart and ,equipped with broach-securing means, and

a vertical work-holder wearing bar secured to said ram between said broach holders.

18. The combination, in a broaching machine, with a vertical ram provided with a rack and with cam members, and adapted to carry on one side broaches, of a gear intermeshing' with said rack, means to drive said gear, a workholder movable toward and away from said ram, and means, operated by said cam members, to actuate said work holder into and out of operative position relativeto and into contact with said ram, whereby said holder, when in contact with said ram, is partially supported thereby. and positions the work in the cut-ting field, and, when out of said operative position, is unsupported by said ram, and positions said work out of said field.

19.'The combination, in a broaching machine, with vertical broach-carrying rams provided with racks and upper and lower cam members, and adapted to carry broaches on one side thereof, of a gear intermesh ing with said .racks, means to drive said.

gear, reversing means for said driving means, work holders movable toward and away from said rams, means, operated b said cam members, to actuate said wor holders into and out of operativeposition relative to and into contact with said rams whereby said'holders, when in contact with said rams, are partially supported thereby, and position the work in the cutting field, and, when out of said operative position, are unsupported by said rams, and position said work out of said field, and means, operated by certain of said cam members, to actuate said reversing means. p

20. The combination, in a broaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower fixed cam members. and adapted to carry on one side broaches, and a work" holder movable into and out of operative position relative to and into contact with said ram, whereby said holder, when in contact with said ram, is partially supported thereby, and ositions the work in the cuttingfield, an when out of said operative position, is unsupported by said ram, and

crating mechanism for said work holder, said mechanism consisting in part of a member which is 'moved positively by the upper cam member into the path of the lower cam member, and moved positively by the lower cam member into the path of the upper cam member.

21. The combination, in a broaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower fixed cam members arranged to impart positive movement in opposite directions to a member in the paths of the same, and an oscillatory work holder, of oscillatory mechanism for actuating said work holder, said mechanism having a member in the paths of said cam members;

22. 'The combination, in a i broaching machine, with a vertical broach-carrying ram provided with upper and lower cam members arranged to impart positive movement in opposite directions to a member in the paths of the same, driving means for said ram, re-

versing means for said driving means, and an oscillatory work holder, of oscillatory mechanism for actuating said reversing means and said work holder, said mechanism positions said work out of said field, of ophaving a member in the paths of said cam member.

23. The combination, in a broaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower fixed cam members arranged to mpart posi-, tive movements 1n opposite directlonsto a member in the paths of the same. a rock shaft, and a work holder secured to said.

shaft, of a second rock shaft, a rocker arm secured to said last-named shaft, and having a member in the paths of said cam members,

and connections between said shafts, whereby the movements imparted by said cam members to said arm is transmitted to'said work holder.

24. The combination, in a broaching machine, with a vertical broach-carrying ram provided with upper and lower cam members arranged to impart movements in opposlte directions to a member in the paths of the same, means to drive said rain, means to reverse said driving means, a rock shaft,- and a work holder secured to said shaft, of a second rock shaft, a rocker arm secured to said second-named shaft, and having'a member in the paths of said cam members, connections between said second-named shaft and said reversing means. and connections between said shafts, whereby movement imparted by said cam members to said arm is transmitted through said first-named connections, to said reversing means, and

through said second-named connections to said work holder.

25. The combination, in a broaching machine, with a vertical broach-carrying ram provided with upper and lower fixed cam members, motor-driven actuating means for said ram, and a gear forming part of a reversing mechanism for the motor, of a rock shaft. a rocker arm secured to said shaft, and provided with a member in the paths of said cam members the latter being adapted to impart a positive movement in both directions to said rocker-arm member, an arm loosely mounted on said shaft and having a toothed segment inter-meshing with said gear, and means to cause said second-named arm to be operated from said first-named arm.

26. The combination, in a broaching machine, with a vertical broach-carrying ram provided with upper and lower cam members motor-driven actuating means for said ram, and a gear forming part of a reversing mechanism for the motor, of a rock shaft, a rocker arm secured to said shaft and provided with a member in the paths of said cam members, an arm loosely mounted on said shaft, and having a toothed segment intermeshing with said gear, and adjustable means between said arms to enable said second-named arm to be operated from said first-named arm.

27. The combination, in a broaching machine, with a vertical broach-carrying ram provided with upper and lower cam members. motor-driven actuating means for said ram, and a gear forming part of a reversing mechanism for the motor. of a rock shaft, a rocker arm secured to said shaft, and provided with a member in the paths of said cam members, and with lugs, screw-threaded members in said lugs, and an arm loosely mounted on said shaft, and having a toothed segment intermeshing with said gear, said serew-threaded members engaging oppositely-dis osed parts of said second-named arm, where y the latter is adjustably connected Iyyith said first-named arm and rocked there- 28. The combination, in a breaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower cam members, of a rock shaft, a rocker arm mounted on said shaft, and having a member in the paths of said cam members. a second rocker arm mounted on and oscillated by said shaft, a second rock shaft, a work holder secured to said second-named shaft, a rocker arm also secured to said secondnamed shaft, connecting means between said secondna-med arm and said arm mounted on said second-named shaft, whereby motion in one direction of said second-named arm is imparted to said arm mounted on said secondnamed shaft, and trip connecting means between said second-named arm and said arm on said work-holder shaft, whereby a movement in the other direction of said secondnamed arm is imparted to said arm on said work-holder shaft, when said trip connectbetween said firstand second-named oscillatory means, whereby motion is imparted in one direction from. the first to the second,

and a trip connection between said firstand second-named oscillitory means whereby motion may be imparted in the opposite direction from the first to the-second.

30. In a-broaching machine, a vertical reciprocating broach-carrying ram, an oscillatory work holder, and oscillatory operating mechanism therefor, said mechanism consisting in part of an operating arm for said work holder, an operating arm for said firstnamed arm, and an engaging and disengaging member between said armswhich must be manually reset after said work holder has been actuated into inoperative position before it can be actuated into operative position.

31. In a broaching machine, a vertical reciprocating breach-carrying ram, oscillatory mechanism operated by said ram, a work holder, oscillatoryoperating means for said work holder, a connection between said mechanism and said means to cause said means to move with said mechanism when the latter is actuated in one direction, and to leave said means inoperative when said mechanism is actuated in the opposite direction, and a trip connection between said mechanism and said means to cause said means to move with said mechanism when the latter is actuated in said opposite direction, provided said last-named connection be in operative position.

32. In a broaching machine, a vertical reciprocating broach-carrying ram, oscillatory mechanism operated by said ram, a work holder, oscillatory operating means for said work holder, a connection between said mechanism and said means to cause said means to move with said mechanism when the latter is actuated in one direction, and to leave said means inoperative when said mechanism is actuated in the opposite direction, a second connection between said mechanism and said means to cause said means to move with said mechanism when the latter is actuated in said opposite direction, means to trip, said second named connection, and means to reset the same. 1

work holder, oscillatoryoperating means for said work holder, a connection between said mechanism and said means to cause said means to move with said .mechanism when the latter is actuated in one direction, and to leave said means inoperative when said mechanism is actuated in the opposite direction, a second connectionbetween said mechanism and said means to cause said means to move with said mechanism when the latter is actuated in said opposite direction, automatic means to trip said second-named connection, and means actuated by the operator to reset the same.

34. The combination, in a broaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower cam members, of a rock shaft, an arm mounted on and secured to said shaft and having a member in the paths of said cam members, a second arm loosely mounted on said shaft, yielding means to connect said second-named arm with said shaft, a work holder, and means, connected with said second-named arm, to actuate said work holder into and out of operative position relative to said ram, said yielding means serving as a shock absorber for said work holder and its operating means.

35. The combination, in a broaching ma-- chine, with a'vertical reciprocating broachcarrying ram provided with upper and lower cam members, of a rock shaft, a rocker arm secured to said shaft, and having a member in the paths of said cam members, a

spring-provided shock absorber secured to said shaft, an arm loosely mounted on said shaft, and having parts against which the shock-absorber springs bear, a work holder, and means, connected with said last-named out of o erative arm, to actuate said work holder into and sition relative to said ram, sai shock ab orber protecting from undue jar said work holder. 4

- 36. The combination, in a broaching machine, with a vertical reciprocating'broach carrying ram provided with upper and lower fixed cam members, of a rock shaft, a rocker arm mounted on said shaft and having a member in the paths of said cam members, asecond rocker arm mounted on said shaft, 9. second rock shaft, a work holder and a rocker arm mounted on said second shaft, and a link connectin means between said secondand-last-name arms, whereby the latter is actuated from the former in opposite directions. I

37. The combination, in a broaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower-cam members, of a rock shaft, rocker arms mounted on said shaft, one of said arms having a member in the aths of said cam members, a second rock s aft, a work holder and a rocker arm mounted on said second-named shaft, a link connecting the other of said first-named arms with said last-named arm and adapted to actuate the latter from the former in one direction only, and a thrust arm adapted to be interposed between the link-connected arms to actuate the one from the other in the opposite direction, when said thrust arm is in operative position. i

38. The combination, in a broaching machine, with a vertical reciprocating broachcarrying ram provided with upper and lower cam members, of a rock shaft, rocker arms mounted on said shaft, one of said arms having a member in the paths of said cam members, a second rock shaft, a work holder and a rocker arm mounted on said second named shaft, a link connecting the other of said first-named arms with said lastnamed arm and adapted to actuate the latter from the former in one direction only, a thrust arm adapted to be interposed between the link-connected arms to actuate the one from the other in the opposite direction, when said thrust arm is in operative positlon, automatic means to release said thrust arm from operative position, and means ac-. tuated by the operator to restore said thrust arm to operative position.

39. The combination, in a broaching machme, with a vertical reciprocating broachcarrying ram provided with upper and lower cam members, of a rock shaft, a rocker arm mounted on said shaft and having a member in the paths of said cam members, a second rocker arm mounted on said shaft, a second rock shaft, a work holderand a rocker arm mounted on said second-named shaft, and a connection between said secondand last-namedarms, for operating the latter from the former arm, said connection comprising a pin projecting from and a link pivotally connected at one end with said firstand second-named arms, respectively, said link having at the opposite end a hook to engage said pin, whereby said last-named arm is actuated from said second-named arm when the same is moved in one direction, and unaffected when the same carrying ram provided with upper and lower cam members, of a rock shaft, a rocker arm mounted on said shaft and having a member in the paths of said cam members, a second rocker arm. mounted on said shaft, a second rock shaft, a work holder and a rocker arm mounted on said secondnamed shaft, a link between said secondand last-named arms to cause the latter to be actuated from the former in one direcloo