US1660812A - Broach mechanism - Google Patents

Description

Feb. 28,1928. 1,660,812

J. L. PERKINS ET AL BROACH MECHANISM Filed April '7, 192? ALL w. 7 1 am,

.A TTORNE Y.

' mechanisms Patented Feb. 28,1928.

. om n Ter- JULIAN L. rnaxms'on wns SPRINGFIELD, as]: HIIR'AM D. oRorT, or SPRINGFIELD,

MASSACHUSETTS, ASSIGNORS To PERKINS MACHINE AND GEA-R- COMPANYyOF.

$PRINGFIELD, MASSACHUSETTS, A CORPORATION 01E MASSACHUSETTS.

enema MEoHenIsM,

Application filed April 7,

Our invention relates to improvements in for carrying and holding breaches and moving them into and out of cutting position, and resides in a carrier adapted to be attached to the reciprocat ng element of a broaching machine, a holder for a line or lines of broaches, links pivotally connected with said holder and pivotally mounted on eccentric members With which said carrier is provided, means to adjust s'a'id eccentric members, on their axes, an abutment or abutments for said holder, actuating means for said holder, and means to secure the breaches to the holder, together with such other parts and' members as may be necessary or desirable in order to render they-mechanism complete and serviceable in every respect, all as hereinafter set forth."

.The primary object'of our invention to provide comparatively simple, yet-highly efs fici'ent, means forholdin'g and presenting a broachor broaches for action'on the Work, andfor giving to said qbroach or' broaches, when desired, a lead or leadsthat can be varied at will and with great minuteness,-

whereby it is possible to obtain the utmost accuracy and the greatest efiiciency With the broach or broaches with which this mechanism is, equipped. I Another object is to provide simple and entirely practical, means for moving the breach or broaches into the cutting field and removing them therefrom, such means being operated to move the breaches into the cut ting fieldbefore theyarrive at the Work, and

to remove them from said field after they have passed completely through the Work;

A further object eisvto supply'mechanism of this character with strong and entirely adequate means for securing the breaches or breach sections so fir'mlyand rigidly to the holder that any displacement of the same, except when released for removal is pre vented. V

Other objects and advantages will appear spindl'e2 i rovidedt with a r c l a o @1 i vents Fi -.12 a front elevatlon of an intermediate portlon 1927. Serial -i 1"o. 181,842.

of said mechanism, which-includes the actu-" ating means for the broach holder, parts being broken away and aportionoftheoperating lever being broken out; Fi 3, an enlarged, fragmentary port on nsectijon of the carrier, SllOWEIlg one of the eccentric membersmounted therein; Fig. 4, an e11larg'ted,-

top plan of the holder, one of the broach sections, and the clamping means therefor, and, F 1g. 5, a side elevation of parts 'correspending-with those shown in the} preceding view.

similar parts throughout the several views,

Similar reference characters designate We have illustrated in connection hreith, and willde'scribe, breach mechanism which is designed to be equipped with both roughingand finishing broaches,'fbut it'is to be understood that the number of breaches orlines of breaches is not material, so far as the present invention concerned, inasmuch as there may be one breach or one line of breaches, or

I ore than two breaches or two lines offbr' "ches.

7 Our mechanisf includes a ehanneledcaras an intermediate,v cylindrical portion Which forms an eccentric 3. Each spindle 2 has at oneend a protruding angular projection 4 to receive thereon a sector 5 inwhich is a segmental slot, 6. Each sector 5 extends forzwardly from the p'rojectionjt on which itis mounted, alongside of the flange of the car rierv l which is on the same side with said sector, and a, bolt]? is passed through said,

fiangefr'om the inside and through thes'lo't 6 inthe sector tojrecei ve on its outer te'rm'ie nal a nut 8. vAlthoughbut one of these sectorsf, with its boltand nut, shovvniinthe" drawingaic is, .to be unde'rs old and {clampin insane therefor ,U on loosening the nut .8 1 a v case,

associated sec or an'dlth'e spindle ape said sector is mounted can be rotated in either direction to, Chan eccentric 3 on; ax1's, ;of said eccentric Qe .tli'

h pa t al of he die, and lo a' j tethe rearwardly as desiredan'ditowniatver e i teeth of these breaches being arranged and constructed to cut' on the down stroke, and

the finishing breaches being above the roughingbroaches, For these lines or sets of cutters 9 and 10 we provide a holder comprising a long section 11 for the roughing cutters, a

. short section 12 for the finishing cutters,

and a connecting bar 13 between said sections,'theo'1: posite end portions of saidbar being attached to ad acent ends'ot said sectionsbypins 141l. The end portions of the bar 13 are let into 'rec'esses'in the adjacent end portions of the sections Hand 12',

with the hacker inner side-of said bar flush with the corresponding sides of said sections. The aforesaid recesses produce lugs 15 and .15, respectively, at adjacent ends of the holder sections 11 and 12. The lugs 15 and 15 extend onto the front side of the bar 13,

and it is through said lugs that the pins 14 extend. C

A link 16 is mounted at the rear end on .BflCli of the eccentrics 3, and is pivotally connected atthe, opposite end with either the holder section 11 or the holder section 12, as represented a't- 17, the carrienl and both holder sections being recessed at 18 and '19, respectively, to accommodate said link and a ifordample spaces forwhatever movementon the part of the link is required.

An abutment block 20 issecured by bolts or other means in the top of the channel in the carrier 1, above the holder section 12,

and an abutment block 21 is similarly secured in said channel, in i rontof the bar 13 and abovethe holder section 11. The blocks or abutments 2O and21 are arranged to limit the upward movement ot the holder sections,

and receive the thrust imparted to said sec tions by the cutters when making their ac-' arm 28 is rocked downwardly. The holder section 12 is formed with an "inset 22 to receive the finishing cutters 10 ti've stroke.

and position them approximately in the lon gitudinal center, laterally, of said section, with their teeth projecting beyond the front edge of the'section, andeach of-said cutters is secured to the section by means of a clamp 23 and a bolt 24. The'inner and outer major! planes of the clamp 23 are in angular relationship to each other, and the bolt2-i'passes through an opening in said clamp which is at right-angles to the outer face thereof, and

is tapped intoan opening in the holder section12 at an angle which corresponds with the anglefof said opening in said clamp for the passage of said bolt. There, must also be an'oblique' opening in each cutter 10 to receive the bolt after it passes through the clamp 23 and before entering the holder section. hen the bolt 24:, after being passed through the clamp 23 and cutter 10 into the holder section 12, is tightened, it not only forces said clamp hard against said cutter,

so that the latter is tightly grasped between the contiguous surface of the inset 22 and that of said clamp, but also tends to force said cutter rearwardly or inwardly against the back end of said inset, and thus to retain the cutter securely 1n. place with its rear edge against said back end.

The individual roughing cutters 9 are longer than the individualfinishingcutters 10, and theformer are secured to the holder section 11' by means of clamps 23 and bolts 24- in a similar manner as the latter are secured to the holder section 12, exceptlthat less clamps and bolts are needed for the longer individual cutters.-

Journaled in a horizontal bearing-25, supported from a bracket 26 securedby bolts orother means to one side of the carrier 1, on the outside thereof, 1s a rock shaft 27..

Mounted on and secured to the outer end 0' y the rock shaft 27'is an operating arm28, and

- mounted on andsecured to the innerv end of said shaft is an actuating arm 29. The arm I 28' atits outer end is designed to be connected with mechanism (not shown) for intermittently rocking said arm and with it the shaft 27 and the arm 29, first in one andthen in the v other direction. through a slot 30, in the side oi the channel in the carrier 1 to which the bracket 26 is fastened, into a recess 31 in the holder bar 13.

When the arm 28 is actuated in one direction, the arm 29 is actuatedin the opposite direction and carries with'itthe bar 13 and the connected holder sections 11 and 12, and when said first-named arm is rocked in the other direction, said second-named arm is rocked in the opposite direction ag'ain'and carries with'it said bar and sections. The abutments 20 and 21 limit the movement imparted to the breach holder at-the time the Means to limit the movement of the holder in the opposite direction is not-needed, because the breaches orcutt'ers are then out of operative position andno end support for the parts is required, as is the casewhen said cutters are in operative position andmaking their cutQ In practice, theholder 'sections 11 and12 areadjustedto cause the cutters 9 and 10,

when in the cutting field to be projected a proper distance therein, and either or both cutters to be 'provided'witha lead orleads ifand as necessary,'by loosening the locking means for the spindles 2, partially rotating said'spindlesto the e'x'ten't required to ad- Vance or retract, by means of the eccentrics 3, and through the mediums of the links 16,

the sections 11 and 12, and then relocking,

said" spindles against further rotation: By this meansand in this manner the holder The arm 29 extends sectionia can be set sothat the broaches 10 have a lead over the broaches 9; or both sets of breaches can be set so that the upper end has a lead over the lower end of each; and, in any event, thesection's l1 and 12 are set to enable the broach teeth to be located exactlyin the cutting plane, when the cutters are in advanced and bioachii'ig position.

The cutters 9'and 10, as disposed in the firstview, are in anintermediate or neutral position, from which position they are moved into active position when the arm. 28

is rocked downwardly, and into normal in active position when said arm is'rocked upwardly. The arm 28 is rocked downwardly to locate the holder sections 11 and 12 against the abutments 21 and 20, respectively,before the carrierl is caused to descend. During the descent ofthe carrier 1 the cuttersS) and 10 make their out. As soon as the cutters 10 clear the work, the arm 28 is actuated to carry the holder with said cutters downwardly in the carrier 1. This downward movement on the part of the holder and cutters is converted into a rearward movement through the medium of the links 16, and the 1 cutters are thus retracted from the cutting field, and they are not again advanced into said field until the carrier 1 has ascended and is about or commences to descend to make the next cut. Being retracted, at the,

of the parts of this broach mechanism may be made, without departing from the splrit' of our invention or exceeding the scope of what is claimed.

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

1. In mechanism of the class described, members, one of which is adaptedto hold broaches, in sliding relationship, adjustable pivotal means carried by one of said members, and connections mounted on said pivotal means and pivotally connected with the other of said members. i

'2. In mechanism of the class described, members, one of which is adapted to hold broaches, in sliding relationship, adjustable pivotal means carried by one of said members, means to lock and release said pivotal means, and connections mounted on said pivotal means and pivotally connected withthe other of said members.

3. The combination, in mechanism of the class described, with a carrier, a broach holderin sliding relationship to said carrier,

and pivotal connecting means between said holder and carrier, of means tomove said holder longitudinally on said pivotal means, the construction and arrangen'ientjof' parts bein such that the longitudinal movement of said holder is converted into a movement,

j in the'direction 01in transverse dimension of sa d holder.

4,, Thec inbinati'On, iirn'iechanism oi the class described, with a carr1er,-a broach holder in slid ng relatlonship to saIdQcar rier, and pivotal connecting means between" i said holder and carrier, of means to move said holder longitudinally OII saidpivotal means, the construction and arrangement of parts being such that thelongitudinal movementof said holder is converted intoanarcuate movement which positions the holder in different vertical planes.

5. The combination, in mechanismof the class described, with a carrier provided with an abutment, a broach holder in sliding relationship tosaid carrier, said abut: ment being in the path of said holder, and pivotal connectingmeans between said holder and carrier, of means to move saidholder longitudinally on said pivotal means, the

construction and arrangement of parts be: ing such that the'longitudinal movement of said holderis converted into a movement in the direction of a transverse dimension of said holden,

6. In mechanism of the class described, a carrier, spindles provided with eccentrics mounted insaid carrier, a broach holder slidingly arranged relative to said carrier, links mounted on said eccentrics and pivotally connectedwith said holder, and means to actuate said holder longitudinally.

7. In mechanism of the class described,

a carrier, spindles provided with eccentrics mounted in said carrier, means to lock said spindles against rotatlon and to release the same, a broachholder shdingly arranged relative to said. carrier, links mounted on said eccentrics and pivotally connected with said holder, and means to actuate said holder longitudinally.

8. The combination, in mechanism of the class described, with a carrier, spindles provided with eccentrics mounted in said carrier, sectors secured to saidspindles, means to hold said sectors against independent movement after the same with their spindles have been partially rotated. for the I proper adjustment of said eccentrics, av

broach holder slidinglyarranged relative to sa d carrier, and hnks mounted on said eccentrics and pivotally connectedwith'said holder, of means to actuate said holder lon-.

gitudi'nally. 7

9. The combination, in mechanism of the class described, with a carrier, a broach holder slidingly arranged relativeto said carrier, andlinks pivotally connected with said Carmel and with said holder, of a rock shai't mounted on said carrier, and provided with an arm in engagement with said holder, and with an operating arm.

10. The combination, in mechanism of the class described, with a carrier, a broach holder slidingly arranged relative to said carrier, said holder-comprising upper and under sections and a connecting bar, and

links pivotally connected'with said carrier and with said sections, of a bearing attached to said carrier, and a rock shaftjourna1ed in said bearing, and having an operating arm and an arm in engagement vwith said 7 bar.

- 11. The'combination', in mechanism ofthe class described, with a channeled and slotted carrier provided with abutments, spindles provided with eccentrics and mountedv in said carrier; locking and releasing means for said spindles, a broach holder slidingly arranged in the channel in said carrier, said holder comprising sections each located be} low one of said abutm ents, and a connecting bar,' and. links mounted on sald eccentr cs and plvotally connectlng with sald sections,

'of a bearing attached to said carrier, .a .rock shaft journaledin said bearing andi having one terminal adjacent to the: slot in said carrier, an arm secured to said shaft-

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