US577107A - leayitt - Google Patents

Description

I. M. LEAVITT.

6 SheetsSheet 1.

(No Model.)

POWER SHEARS.

NQ. 572,101 Patented Feb. 16, 1897.

WITNESSES;

(No Model.) 7 .6 SheetB Sheet 4. I. M. LEAVITT.

POWER SHEARS.

No, 577,107. Patentd f'ebflfi, 1897.

HEW

Mk m

. gy w. m

'FIG.. 6;, v

WITNESSES; 1 INVENTOR:

By his Allorneys,

M l V UN TED]; STATES l PATENT OFFICE.

F'RANK' LEA'V'I'IIT, or. BROOKLYN, NEW YORK, .AssIGN oR .To, THE;- 1

POWER-SHEA Rs.-

'- srncxmcnrrolvjfo mm part of Letters Patent N... 577,107, dated February 1o, 1 97. Application filed A a1;2,1s94.;.neimy5a Jul 13,1895. Serial no. 599,053. (No model.)

To all whom it mar concern.- f I Be it known that I, FRANK M. LEAv-ITr, a

citizen of the United States, residing .inBrooklyn', in the county of KingsandState-of N cw.

York, haveinvented certain new and useful Improvements; in. Power shears, of which the: fol-lowingis aspecificati-on. Thisin vention relates to shears for cutting I heaity bars off into lengths, being especially designed as a'nsuclz-bar shears;

The invention provides means for making the operation automaticQ'the'. muck-bar or for-starting and stopping the same and op-- other .bar or thing 'to-be cut up being fed between the shearing-jaws, and the jaws tripped and caused to operate upon a predetermined length'of barhavingbeen fed throngh,so'

that the .bar is length.

The invention 'previdels several i-mprov mentsrelating-to'thecontroljof such shears cut up into pieces 'of 'nniform eratin g the shearing-jaws automatically or by hand, as may be required, all as will be-hereinafter set forth. I

In the accompanyingdrawings, which illustrate the preferred embodiment of my in ven tion, Figure 1. is a front elevation of the machine. Fig. 2 is a front view of the head car ryi'ng the upper or movable shearing-jaw with the front plate'd'etaelied.' Fig. 3 is an elevation ofthe right-hand side of the. ma-

chine, the-roller -table for feeding the bar being in transverse section on the line-3 3 in Fig. 1. Fig. 4 is an elevation of the left-hand side of the machine. fragmentary View of a portion of the mechanism shown fin Fig. 4 isolated from the remainingparts to show its construction more clearly; Fig. 6 is a fragmentary plan, partly in horizontal section on the line 6 Gin Fig; 4. Fig. 7 isa plan of. the sliding receiving-table shown in Fig. (3 removed. Fig. Sis a plan of rlhe movable guide-bar and clamp seen in Fig. Gremovd. Fig-9 is an end or front view of the clamp shown in Fig. 8. Fig. 10 is a section through the roller-table and shears on the line 1010 inFig. 6. Fig. 11 is a front view in section, showing the clutch and, clutch-operating mechanism isolated from the remainder of the machine. Figs. 12 and 13 are transverse sectionsthrough the roller-ta" "ofthe remaining figures.

Fig. 5 is a sectionalin Fig. 10; Fig. 14 ,is asectional plan view showing a portion of the mechanism in detail,-

Fig. 1% isa fragmentary plan of the slide-bar shown in Fig.- 14. and Fig. 14) is-a fragmentransverse section onthe line 15 15in Figs. 1 and 6. 1 Fig. 16 is a fragmentary sectional ."ble, taken respec tivel y, on the lines 12and 13 4 'tary front View of the same bar. -Fig. 15 isa V Figs. 10 and '12 to 1.6 areon double the scale l I will now proceed to describethe preferred construction of my machine with reference to the said drawings.

jaw A for the lower or fixed shear, and with The lower or fixed'shear is lettered a, and the' :.lhe' main frame Act the shehn'zs is of usual construction, being a heavy massive frameof "greatstrength and form-edwith iarecess,.as usual, in which the shearing-jaws operate, being formed beneath this recess with a fixed -a head A Fig. 4, in which slides the framecarrying the upper or movable shear, and beupper .or movable shear is lettered b', the latter being carried by themovable jaw B, which is constructed as a slidemoving vertically in ways in the head A as shown in Fig.2. It is driven by an eccentric a, working in a sliding block 0 and formed on the end of the shearoperating shaft 0, which shaft-is shownin dotted lines in Fig. 3, and has hearings in the main frame A. On the opposite endof this shaft is fixed a large gear-wheel C, which meshes'with a driving-pinion'D, fixed to the drum D of a clutch, these parts D-D' being loosely mounted on the driving-shaft E,whi ch is driven continuously by any suitable power.

For driving it I have shown a steam-engine F,'mounted on the main frame A, its pitman engaging a crank E",.Fig. 3, on the shaft E.

This shaft is hung in-suitable bearings and has fixed on it preferably a fly-wheel e, and also the driving member of a clutch G, of.

which clutch the drumD constitutes the [driven member. The particular construction of the clutch is immaterial, several clutches being known to machinists that will answer the purpose of coupling the driiving-shaft-E to the pinion D, which is the essential function ofthis clutch. Normally the shaft E revolves idly,-carrying the driving member of the clutch around with it; but when the clu teh is operated to engage the drum D the latter and the pinion D are revolved with the shaft E, thereby imparting mot-ion to the -3.3;car C and sl it C, and consequentlyoperating the shear-Yaw B to cause the upper shear to descend and make its shcarin g cut and then to reascend to its normal position. (Shown in Fig.

2.) Upon reaching this position the cl utc'h G automatically (lisengagesitsclt thereby stopping the jaw in position ready for the next shearing operation.

It is thus essential that the operating-shaft C be driven one revolution at a'time when ever a shearing cut is required to be made,

and stopped at the end of the revolution. To

, perform this service, I have adoptedand applied in the. construction of my present inachine thec' u .ch mechanism for power-presses. &c. claimed-in my Patent No. 49Q,715, dated January .31 1893, as .will be seen by comparing Fig. ll "of my present application with I Fig. 4 ofthat patent, only slight changes in the arrangement of the "parts having been made, with some improvements in details of construction, whiehl w'ill presently describe. I will here-briefly describe the mechanism, referring the public to-mysaid patent forv a more complete understanding; of its essentialfeatures.

- Fixed on the operating-shaft C is a canrd, operating on a lever cl, at the free end of which is jointed a sleeve (P, to which is pivoteda' trip-lever or pawl j, which engages a notch inan upright rod K and normally up- ,holds it until tripped by the rocking of an elbow-lever Q, which is rocked by pulling aheavy block K, fixed to it, and its fall being eased by dash-pot K As the block descends it rocks an elbow-lever J from the position shown in full lines in Fig. 5-to that shown in dotted lines, and as the upright arm of this lever engagesa slot in aslidiug bar IIit slides this bar to the right in Fig. 5, this bar sliding in a frame H, Fig. 4, which also forms'a hearing for the shaft of lever J. The bar II carries an arm f, which in so moving slides the controlling-hubG' of the clutch G toward the drum D, and thereby causes the grippingjaws rr of the clutch to close upon and clamp the drum D. so that it is driven with the clutch. I will not describe the details of this clutch, as the same are immaterial to my present invention and are fullydisclosed in my said patent. By the same movement a brake w tnch normally holds the drum D from revolving is released. The construction and operation of this'brake are somewhat ditferent from that in my said patent. The brake nuts Tu h'rengag'd,respectively, by right and left hand screwthreads on anoscillatory shaft- 72, so that when this shaft oscillated in one direction the jaws are moved apart,

and in the other direction are d rawu together. The jaws carry brake-shoes z 1, which as they are drawn together bear against the outer and inner sides of the rim of the drum l).

Wren the rodv K is elevated, the jawsare drawn together and the brake-shoes pressed against the rim to clamp it and hold the drum stationary. but as the rod K falls a lever-arm i', engaged by'a blot-l; K and fixed on the shaft 71. is moved from the position shown in full lines in Fig. 5 to that shown in dotted lines, thereby oscillating the shaft 72, and by the action of the right and left threads on the nuts the jaws g are thrust apart and the brake -shoes released, thereby freeing the drum. that upon pulling down the rod inand. tripping the pawl j the brake holding the drum D is released and the clutch is instantly applied to drive it, so that the shaft: L is driven in thedirectiou of the arrow in l ig. 11. .iefore the end of one revoluti n of this shaft the cam (1 drops the lever d to enable the pawl to'reengage with the notchin the rod K, and just before the end of the revolution is completed the cam lifts the lever, and

.thereby through the sleeve and pawl lifts the rod K to its normal position. In so doing the opposite movements are transmitted to the clutch and brake inorderto release theclut-ch and reng-age the brake to check the momentum of the parts and stop the shaft, the stoppage of the latter occurring at the end of one revolution.

r\n-improvement in detail over the construetion shown in my aforesaid patent con- 5 sists in themeans for connecting the rod K down a rod on, Fig. ll. \Vheu thus tripped, the rod K falls. its weight being increased by which blocks fit the transverse slots, so as to slide in said slots and allow fonthe movement of the ends of the levers in the arcs of circles.

The'meansfor operating the shears from the driving-shaft and for coupling and uncoupling the clutch having now been made clear, I will proceed to describe the other and more novel features of myjm proved machine.

My improved shears being designed most particularly for cutting up muck-bars as they come hot from the muck'rolls, itis important that means shall be provided for feedingthe muck-bar to the shears. To this end I provide a roller-table which as a 'wholeis let.- tered L, being seen on the right of the shears in Figs. 1 6, and 10. l Only a portion of this" roller-table is shown, it being of variable It results from these constructions.

length, according to circumstances, and ex tending from the much-rolls to-the shears, so that as thebar emerges from the. rolls it runs onto tlie -tfitbleand is parrie d'alpng thereby to the shears. The roller-table should consequentlybe longer than thelength of the muckbar. It is made up of rollers 1.; k, arranged the main frame A. This frame L is shown as consisting of longitudinal side bars or plates, with transverse webs at intervals, the

side bars being formed at their upper sides with the necessary bearings for supporting the journals of the rollers. The rollers are driven from the main driving-shaft or cranle shaft E of the engine by means of a pinion 6, formed on the end thereof, Figs. 3, 6, and 10,

- meshing with agear e fixed on'the shaft of the next to the end roller.

} also fixed a gear-wheel f, meshing with an. idler-gear f Fig. 10, which drives a gear f on the shaft of the next roller vto the right,

' and from this shaft, by miter-gears m, rotation is transmitted to a longitudinal'shaft M,

' extending thence to the right and from. which all of the remaining rollers k k are driven by pairs of miter-gears, as shown in Fig. 6. The terminal roller 7:, is driven from the gearwheel j" through themediuniof anidler-gear 7, meshing with a gear on the roller-shaft,

and this same idler-gear f communicates motion to an upper-feeding-roller n by mesh.-' in g with a gear-wheel n, Fig. 1,0, which intu'rn drives'the gear-wheel n and the roller at; This upper roller n in connectioiiwith the roller k serves for more positively feeding the muck-bar to the shears than by its mere rest- 1 ing on the roller-table, since the'roller n is pressed downwardly against the top of the bar, so that the bar is pinched between the-two rollers,whi c h,revolving inopposite directions,

act in the same direction to thrust the bar toward the shears.-

For pressing down weight it, Fig. 1, mounted on the end of a lever w and pulling down through a link or bar w, the upper. end of which is connected to the shaft of roller 11 or to the-frame which carries this roller; 'To admit of the roller 7?.

. being moved up or down whileycontinuing revolving, on which the gear nisl also moun t-' its rotation, it is-mounted in the arms "of a frame 0, which is pivpted on the same axis as the gear n, preferably by being" fdrmed with a tubular elongated 'hub of, which is mounted ona shaft either stationary or ed, and which shaft supported above the frame L. Hence by the swinging of this frame 0 the roller'n may be raised or low ered, being constantly pressed downby the tension of the weight w.

For guiding the 'muck-bar asit' is carried alongby the rollerdame-opposite guiding strips or bars 11 and 1), Fig. "6, are provided,

On this shaft is.

the roller it I provide a .feed'. of the muck-bar.

released, theweight w restores the parts :to

being mounted just above the tops of the rollers, so as to engage the side edges of the muck-bar. The bar 1) is preferably fixed in position ,although it might be adjustable, and the adjustment to accommodate muck-bars of different widths is preferably made by moving the bar 17 toward or from the fixed b'ar.

To this end this bar is mounted at intervals .on brackets 1'2 Figs. 1 and 6, which brackets I may slide laterally along dovetail or under-- cut grooves 19 Fig. 10, in the cross-bars of the supporting-frame L and beingclamped to said grooves by headed bolts in an ordi-v nary manner.

The roller-table is provided 'withmeans for gripping or clamping the nucltfbar when desired to arrest its forward feed to the shears.-

To this end'I provide a clamp adapted to graspthe muck-bar on opposite sides and grip it so firmly that the mere forward his I pulse of the rollers is, on which it rests, will be insufficientto propel it forward; This clamp f as a whole is lettered I, and consists of a fixed jaw I on one side and a movable jaw I on the other sideof the muck bar. Both jaws might be movable sim ultaneously'toward and from each other, but it is preferable to make the jaw- I. stationary and form it' as a rein-J guide-bar p. The movable jaw I (shown detached in Figs. 8 and 9) consists of an upright wall mounted ona slide s,' whi ch in the construction shown 'is formed as a saddle seated and sliding. on-the top .of the trans- (See Fig.

verse partition L of the frame L. 10.) The slide thus-moves with a'parallel 195 forced 'or strengthened continuation of the motion transversely of the roller-table, and

its clamp I is kept parallel with the fixed neoted to the slide 3 and passes off to the front of the machine, as shown in Figs. 6 and 13, where its end is connected to a crank-arm s on a rock-shaft N, towhich is fixed an operating handle or lever N, so that by pressing down this handle the rod 8' is pulled to:

close the clamp 'upon the muck-bar. At the same instant that the bar is thus gripped. it is important thatit should be freed from the tractive strain due to its being pinched between the feed-rollers'n and 70. To this end For movingthe jaw I? a'rod s is con- I provide for lifting the roller 11 simultane' ously with the closing of the clamp. To do this, I fix on therock-shaft N a cam-arm N,

Fig. 12, which acts against an adjusting-screw,

seated in a boss w on the upright bar 10 and which is connected to {he frame 0 of theroller 11, thereby lifting the frame and roller as the 7 lever N is-pr'essed down. Thus the roller n.

is lifted off the muck-bar just before the bar is gripped by the clamp, the one downward movement of the handle N serving to accomplish both movements and thereby arrest the When the handle is their normal, position.

As the clamping-jaw l 'has aparallel 1110- I tion it is necessary to provide forgniding I clampingjaws whatever may be the-position ro'of the-jaw I the muck-bar; so that it shall pass between this jaw and thefixed'jaw I. To this end I providea swinging guide-bar P, Figs. --6 and ,8, pivoted to the frame at'p in line with the 1 fixed guid'ejpg and-jointed near its other end to theblampirig-jaw .I inorder 'to'. move. out and in with it andformthereby an inclined guide for directing the'muck-bar' between the To efiect their connection, the jawl is provided with an'upwardly-project i'ng pin 8 Figs, 8- andy9, which enters an elongated hole or slot 8 in the bar P, and to better connect the parts I and P the former is made with a flat plate or extension j and the latter with-an extended nose which lies over said plate, as shown in Figs. 8 and 13. I To prevent any lifting or tilting ofthe muckbar while under the actionof the shears, and particularly of the last end of the bar when it has passed beyond the rollers n k, I provide a bridge q, under which the bar passes on its way to-the shears, Fig. 10; In OldGIgiiQ render the shearing Operation automatic, so as to cut the muck-bar offinto;

sections of uniform length, ;I. provide the clutch-tripping mechanism which I will now describe. The end of the muck-bar as, it is fed through between the open jaws'of the shears strikes against a push-plate R, which is so mounted that it is movable, yielding to the push .or thrust exerted by the end of the muck-bar as it feeds forward. In the construction shown the push-plate is fixed. on a plunger R, which slides freely in a fixed lead-block S, a parallel guide-rod 0" serving 0 hold it from tilting. Against therearendf the plunger R comes the end of a pushrod R as best shown. in Fig. 14. This rod 40 passes through a block if, in which it is fixed by a set-screw, and this block is pivoted to one arm of a lever t, the oppositearin of which is jointed, as shown in Fig. 6, to a push-rod m the opposite end of which is jointed to one arm of an elbow-lever a, Fig. 11, the oscillating shaft u of which extends from front to rear along the frame .A and the opposite arm of whichis jointed to the pull-rod m, previously described. A spring m is connected to the elbow-lever u,-

1 and 11, to exert a retractile thrust against the rods m m 13*. \Vhen the push-plate R is pushed back by the muck-bar striking it, tliis'tliru'st is communicated through the rods R in", and m in the direction of the arrows, pulling down the latter and rocking the elbow-lever Q to trip the pawl j, and thereby engage the clutch and cause the operating-shaft C to execute one revolution, as before described, so that the 0 shears are operated to cut oif a length from the m uck-bar. The length thus cut off drops out of the way, and as the shear-jaw I; rises the muck-bar again feeds through between the shears and the operation is repeated.

'In order to enable the automatic trip-motion for the clutch thus described to be thrown is provided, pivoted on the 1' Fig. 14,-s'o that the rod may slide. through this hole as it is but by throwing the lever T to either side this end of the rod R is swung laterally far enoughto stand clear of the plunger R, so that when the push-plate is thrust back by the muck-bar its movementis notcomniunicated to the rod Ri and the clutch. is not 0perated. hen the automatic trip is thus thrown out of action,'it is necessary to have some meansfor tripping the. clutch by-hand.'

pushed by the plunger 'R,"

[To this end I provide a clutch-operating lever U, Fig. 1, fixed on a rock-shaft U, Fig. 4, on the rear end of which is fixed a lever-arm U Fig. 11, the free end of which comes against the elbow-lever Q, so that by' pulling down .on-the lever U the lever Q is operated to trip the pawl j to the same effect as if operated from the push-plate R. ,The lever U is retracted by a spring in, which'holds it normally out of action.

' In order to render the automatic clut'ch- I tripping mechanism adjustable to out the muck-bar into different lengths, the headblock S is attached to a longitudinal bar S,

extending parallel to the direction, of feed of I the muck-bar, the block S having a sliding connection with the bar S, so that it-niay be slid along this bar and. set thereon by set screws 20 at any desired position. R has to be adjusted to the samefextent, to

provide for which it has a sliding connection with the block t,'to which it may be set in any position by the set-screw. After the muclb'bar begins to push the plate R and trips the clutch it continues to foo The rod feed forward until the plush-plate striks'th'e fixed block S, which stops the bar, whicli 'thus remains stationary while the shears cut it immovable, the section of If the blocks were bar when cutoff would be wedged tightly bet'ween'the fixed shear and this block and be prevented from falling freely but of the way. To avoid this, the head-block S is so mounted that after the shear begins to operate on the bar the head block moves away from the muck-bar, carrying the plate R with it, so as to leave the cut-off section free from end I pressure.- To this end the bar S, to which ithe head-block is adjustably attached, is

mounted, so as to slide longitudinally, being a supported at its opposite ends inbearings g Fig. 14, and in order to impart the. required motion to it it has a cam connection with the movable shear frame orjaw B. To effect this connection, the bar S is formed with an oblique notch .or recess S as shown in Figs. 1% and LL", and thisrecess is engaged by an obliquearln .13, fixed to and projecting downwardly from the shear-jaw B. The obliquity of this arni is .such that 'as the shear descends it thrusts the slide-bar S to the left out of gear or rendered inoperative when dein Figs. 1, 14, and 16, so that'the plate R re- Y cedes from the muck-bar after the latter is caught by the descending shear. Fig. 16

' shows the machine in the position where a section a,- of the muck-bar as has just been severed by the shears and is about to fall.

'In case the muck bar has to be cut off into --sections of considerable length' it is desirable that some means shallbeprovidedfor sup porting the end of the muck-bar that has been fed through to the shears before it is cut off in order to prevent its being bent or. distorted by sagging under its own weight.

' To this end 1- provide. a table v, .(shown detached in Fig. 7,) which stands beneath the .head S and push-plate-R and in such po'si-' 131011 218 to receive upon it the sagging unsupported end of the muck-bar as the' latter is fed beyond the shears. Thus anyxlength of muck-hart may be fed throughbefore-being cut off: and it Will'be properly supported by this. table. In order, however, to enable the cut-off sectionto fall out of the. way as soon as it has been severed, 1' construct the table V to slide laterally, so as'to pass out from under the" muck-bar and cause the latter to drop.- This sliding motion-is'eflected simul- V taneously'with the cutting movement of the shears and preferably by a mechanical connection with the shear-jaw B. As shown, this connection consists of a sort .of elbow-lever constituted by a rock-shaft V, hung in suitable fixed bearings having downwardly? projecting afms V .the' rounded ends-of which engage slots 12 v in the table and having an arm V carrying a roller I), which is engaged by slot oifforme'don the shear aw or frame. B in the manner shown in Fig.

15. There being tw'oarms V engaging the- A table V, the latter is given a parallel moveinent sliding in transverse ways formed in the supporting frame or bracket A "beneathit.

- The,operation:of my improved muck-bar shears is as follows Them uck-bar as it comes from the rolls is directed onto the roller-tableL, by which it is carried towardthe shears. As the advancing end ofthe bar approaches the shears the operator presses down the handle N, so as to grip the bar by the clamp I in orderto control its feed',"releasing-it and 5o letting it feed forward little by little until the rounded advancing end of the bar has entered between the shears sufficiently far to cut off the rounded portion and form a square end on the first section or length to be cut 5 from the muck-bar. He holds it in this posi-tion by holding downthe leverN while he pulls the leverU'to trip the clutch and make v the shearing cut;

He then releases both levers and-permits the machine to operate au-. tomatically, the head S having been previ ously set to the required distance from 'the shears for cutting the sectionsof muck-bar to the proper length.

is fed through between the shears and strikes 'the push-plate R it trips the clutch, the shear As the end of the bar descends and. cuts ed the bar, while at the f ronrtlie endof thebar and the table V slides out from underneath ;it, thereby leaving it free to fall and causing it todrop down heneath; the shears.

Itinust not be inferred from the particularity of detail withwhich I have illustrated and described the'preferred construction of my improved machine that my invention is necessarily limited to the mechanicaldet-ails thus set forth, since, in fact, it'is'susceptible I of considerable modification in mechanical construction, and by jthe substitution of mechanicalequivalent-sfor the several instrumentalities shown, and by the omission or addition of certain parts as-may'be required for adapting it to varying purposes.' These features of my invention which are believed to be essential are sought to be defined in the claims.

I claim as my invention the following-defined novel features,,substantially as-hereinbefore specified, namely: e

1. Ina power-shears, the combination of a driving-shaft, a feed mechanism for the bar to besheared, driven. thereby, the movable from said driving-shaft, aclutch for'coupling said shear-o'peratin g shaft to the-drivi n g-s haf t to operate the shear, and a push platexin the path of feed of the bar, connectedto said clutch to en gagethelatter when displaced by the bar, whereby the shear is tripped automatically to cut off the'bar. into equal lengths.

In a power-shears, the-combination of a' driving-shaft, a clutch for coupling the movable shear to said shaft, a push-plate R in the path of feed of the bar being operated on,

a head-block S supporting said push-plate, and mechanical connections betweensaid push-plate and the clutch for engaging the latter'whcn the push-plate isd'ispl'aeedby the bar;

'3. In a power-shears, the combination ofja d living-shaft, a clutch for coupling the movable shear to said shafta head block S adshearing-jaw, a shear-operating shaft, driven Iio justable'longitudinally of the direction of feed, with means for loeking'it in anyadjustmcnt', a push-plate carried by said block and movable relatively. thereto arranged in the path of feed of the'bar, ai'idi mechanical connec'tions between said push-plate and clutch the path of F feed off the bar being "operated 1 upon, connecteditothe' clnteh *to en gage the latter when displaced by'theibar, 'andafme; chanical connection bet'weensaid push-plate and the movable shear, adapted upon the (lescent of the shear' to cause the pushgplate t 0 'reeedetherefrom.

5. In a power-shears,the :combina tionbf a driving-shaft, a clutch for coupling the mov able shear to said shaft, and-a pusli-plate in same time ilw head S and plate R rceedc the path of feed of the bar being operated block upon,"connected t0 the clutch to engage the latter when displaced b *the bar, ahead-block carrying said push-plate, a longitudinal slid.- ing bar to which said head-blockisconnected, and a connection between said bar and the movableshear adapted upon the descent of the shear to slide the bar longitudinally and cause the push-plate'to recede from' the shear.

. 6. In a power-shears, the combination of a driving-shaft, a clutch for coupling the movable shear to saidshaft, and a push-plate in the path of feed of thebar being operated upon, connected to the clutch to engage the latter when displaced by the bar, "a head- S carrying said push-plate, a longitudinal sliding bar S having a recess 8*, and an inclined cam-arm B engaging said recess and fixed to the movable shear, whereby during the descent of the latter a thrustis (3011111111 n eated through said arm to said slide-bar to carry the head-block and push-plate away from the shears, r

1 '7. 1 In a power-shears, the combination of a driving-shaft, able shear to said shaft, a push-plate R in the path of feed of. the

bar being operated on hav- -"ing'a sliding'plungeror frame, mechanical .ble arranged to receive and support the bar movable sheanhead B, ranged to support the bar to be cut as it is to be cut .as the latter is'fed between the shears, and mechanism for operating said table adapted on the descent of the shear to move back the table'from under the sect-ion of bar that is cut off the latter to fall. I I

9. In a power-shears, the combination of sliding table V, ar-

by the shears to-permit fed between the shears, and an elbow-lever connection between said table and shear-head consisting of a rock-shaft V extended parallel to the direction of feed of the bar to be cut, having an arm Y engaging said table and an arm V engaged by said shear-head, whereby upon the descent of the shear-head the table is caused to slide out from under the section of bar that is out 01f.

10. In a power-shears having a drivingshaft, a clutch for coupling the movable shear to said shaft, and a push-plate in the path of on for auto-' feed of the bar being operated matically tripping the clutch, a c1utch-engag-' ing mechanism comprisinga restraining-pawl j, a lever Q for rocking said pawl to release it and engage the clutch, and mechanical connections between said lever Q and the pusha clutch forcoupling the mov-- consistin in part of a push- .volving ping the clutch manually, and an arm Ufi conw neeted to it and acting against the lever-Q, may be operated to.

whereby said latter lever release the clutch either from the pushfpla-te said hand-lever-U.

a roller-gable having rollers f r feeding the barto be operated'npon to the shears, of'a clamp having'opposite jawsr,elative1y movable to grip the bar between them to retard its feed, andan operating-1eerator may at will close the clamp upon the bar to arrestthe latter. I Y

a roller-table having continuously-revolving jaw I, anda movable jaw 1", arranged on opposite sides-of. the path of ring-lever N connected to said movable jaw I to move it toward thefixed jaw, whereby the operator may at-willclose the clamp upon the bar to arrest the latter. I i

13. In a power-shears, the combination with a roller-table having continuously-revolving rollers for feeding the-bar to be operated upon to the shears,

jaw I, and a movable jaw I formedon-a slide .8, witha transverse 'slideway for guiding said slide in its movements to keep the two aws parallel, an operating-1e ver N, and a connecting-link s joining it to said slide. w

14. In a power-shears, the combination with a roller-table for feeding the bar to be operated upon to the shears, f a clamp. I consisting of a fixed jaw I,anc a movable jaw I with transverse slideways-for guidingthe latter in its movement to hold it paralleltothe fixed jaw, and amovable guide+bar P joined at one end to a fixed the other end to said movable jaw", whereby it moves with the latter and guides the bar to be operated upon between the two jaws of the clamp.

15. In a power-shears, the combination with.

a roller-table for feeding the bar to the shears consisting of rollers geared together and re"- vol ving in the same direction, of a pressureroller 11 mounted over the terminal roller of the roller-table, gearing for driving the roller n at the same speed as the rollers of the table but in the opposite direction, a movable frame 0 carrying said roller, a tension device for pressing said frame down, .to cause said roller to' grip the bar being fed, and an operating-lever N connected to said frame to raise it and free the bar.'

- 16. Inapower-sl1ears,tl1e combination with a roller-table-for feeding the bar to the shears consisting of rollers geared together and rein the same direction, of a pressureroller 11 mounted over the terminal roller k of the roller-table, gearing for driving the,

plate, combihcdwit h a l1ai'id-levcrUf0r trip- I n a power-shears, the combination with contin no usl y-revolvin g of a clamp I consisting'of a fixed ve'r connected to said clamp by which theop- In a po wer-shears, the combination with rollers forfeedin g the bar to be operated upon to the shears, of a clamp'I consisting of a fixed.

travel-of thebar to grip the bar between them, and an operat- ICC part and connected at 4 roller 22, at the same speed asthe rollers of the table-but in the opposite direction, a movable frame 0 carrying said roller, a clamp I- for gripping the bar to retard its feed,. andan operati'n g-iever N connected'to said frame 0', and clamp I to simnltaneonsly lift the pressure-roller free from the bar'and to close-the clamp against the bar.

17. In a power-shears or analogous machine, the combination with the driving-shaft, c1utch and clutch-drum, of a brake for arrcstin g the latter when the clutch is released consisting of jaws g g carrying opposite sides of the rim of said drum,

brake shoes engaging and-left-threaded oscillatory shaft-h engaging'said nuts, and a connection between said said block, and a right and left nuts carried by said jaws, and a rig'htoscillating said shaft upon engaging or di s-.

engaging the cli1tch.-.

18. In a power-shears or analogous machine,

the combination with the driving-shaft and clutch, of a cint chbpera-tin'g mechanism comprisin'ga tripping device, a failing bar. K

formed with a block K, a lever-arm entering sliding block movable in a transverse recess in said blockK; and formed with a socket receiving the rounded end of said lever-arm.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

FRANK M. LEAVITT. I

Vitncsses:

GEORGE II. FRASER,

' CHARLES K. FRASER.

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