US921977A - Tool-holder. - Google Patents

Description

C. L. GOODRIUH.

TOOL HOLDER.

APPLIUATVION rum) APB. 1a, 190s.

92 1 ,977. Patented May 1s, 1909.

W56 ess es: [lave/war:

T L Wd/ich y/n'sdttorn ey, j 4 f d UNITED STATES -i'ATEisiT OEEICE.

eLmEN CE LEON coooiiicn, or HARTFORD, CONNECTICUT, AssIGN on To PRATT a WHITNEY COMPANY, or HARTFORD, CONNECTICUT, A UOETOEATIO'N or NEW JERSEY.

Toom-HOLDER.

Specification of Lettera Patent.

rammed nay is, reos.

. 'Appiieanon mea'aprii 1s, iene. i serial No. 312,426.

To allwhom it mtl/y concern: ,-.1 Beitknovm 4that I, .CLARENCE L. GOOD- 111011,, citizen of the United States, residin .at Hartford, in the county of Hartford an 5..Sta.te of Connecticut, vhave invented certain 'newand useful Im rovenients in Tool- Holders, of which the ol'lowing is especifica- ,.ttion.- j v This linvention relates to devices for'lioldl ,dies Vand taps, or other screw-cutting tools, and -isl the nature of an improve# rient on thev ool-holder covered byU. S.

Patent No. 803,981, dated January 2nd,

1906, and to which reference may be had.

15. Inaid patent, guides for permitting al vieldungmovement 1n a spiral ,path of the device in which the tool islield are set forth, and the Present invention comprises improveinei. ts

. m the construction of, and in the manner of .mounting saidl guides, whereby improved results alle obtained .Other improvements relate to means'car-I 'ried .by the tool-holder proper for engagingV e the uides just mentioned, and to means for causin'g the tool to engage the work under yield' plaine In the accompanying drawings, Figure 1 is a longitudinal, vertical section of a. toolholder embodying the features of tlie'inven,

tion, saidsection bein takenon line 1,1 of 2. 2 is a si eelevation. Fig. 3 a front end view; and Fig. 4 a section on line 4-4 .of iFig. 2; v Qn., i Like numerals. designate similar parts `vthi-ou hout! the several views.

Refining to the drawings, the numeral designates a tubular shank `adapted to be received in the socket of a turret or other car- 110A Tier, and 2 a head rigid with sii-id shank a'iid provided .with ears or projections 3 and with Sockets 4 at its opposite ends. Clutching guide-arms 5y are pivoted o ii bolts .6 passin through Vthe ears or rojections 3, and eac 4 5' rarmgproj ects beyond aid ears, and isprov-ided lwith an inclined side 6" and vvitli Va forward end inclined at 7 for a .described A socket 8 is orinediin each arm 3 hack of its ivot, each socket being in alinement with tie. socket 4 of the head 2, and

`1tliese sockets 4are for the reception of coiled spnings 9 which normally force the guides 5 to -.the position illustrated in Fig.. 1 and against stop-pins 10, .passing -t ugh the ears; i f Y pressure, as will be hereinafter eas-- urpose hereinafter Fitted in the bore of shank 1 'and passing through the head 2-is the stem 11 of a dieor tap-holder 12 provided with a socket 13 .in which the tool is secured by a screw 14, or other device l(see Fig. 3). This stein is ,piro vided With a chamber 15, in which is placed a coiled spring 16, and at the .outer end .of said s ring is a plunger 17 fui-cated at 1S to `strad le adpin 19`passin `through the rear end of' vsai stem, and t 'ough -a Collarf20 upon the reduc'ed rear end thereof. An iin"- lterna] thread 21 is formed in the tubular shank 1, and engaging said thread is a plug 2:2,grooved at 22 to receive a screw-driver. Surrounding the'stem 1-1 and located within the tubular shank 1 is aV coiled-sprinU-QB, the Vinner head of which ahuts against the head .2, and its op osite end against the collar 2.0,

as illustratedpin Fig. 1.

As, shown byFigs. 1 and 4 the ste-iii 11 of liead'i12 is of cani-shape as at 24. In'other Words, said stein is concentric for a ortioii of its periphery, and terminates ina s oulder 25, following which is a curve 26 of less radius. Mounted in a boi-e of one of the ariiis 3 of the head 2 is a plug 2.7, rabbeted at its top to foi-In a shoulder 28 with an inclined surface 29 to pernii t clearance, the end of the shoulder 28 bei-ng in contact with the caIn- A shaped part of the steinll'. At its end op- 85 posite the shoulder plug27 is rabbeted at 30 to rovide a seat for the end .of a flat spring 31 lield to the arm byscrews 32, as illustrated in Fig-4, and serving to for/cetlieplug inward While permitting it toyield'in an outward directa'on when the screw or other object luis been threaded and the holder rotates idlv with sadobject. In 4the head1?, or toolholder proper, are seated )lugs 33, cach hsving r 1i inclined Wall 34 at its Outer 4end termina. .ig in a Hat surface 35, and each also having' an Iinclined wall 36 .located substantially at right angles tothe incline 34. Inthe operation of the improvement the tool-holder is advanced until the threadingtool engages the Work, carried -b the usual revolving chuck (not shown) um er yielding pressure. On contact of the .tool with the WO1-k, the head 1,2 and its stem 11 are foi-Led slightly backward, .the stem sliding over the ful-cated plunger, 17 and compressing the spring 15, thuslcausmg -the .tool 'to make proper contact the work and avoid Iriarring or of the thread- .thereon at the cetof-theevatting-.action. When 1`10 the screw-cutting tool engages the work the lead of the thread being cut causes the toolclined wa ls of the arms 5 the tool-holder 12 will remain substantially stationary except as regards the slight rotary and longitudinal movements mentionedpand that when the thread has been completed the plugsSS will leave the ends of the arms 5 and the head 12 will rotate idly with the screw being formed. When this` action occurs, the tool-holder and its shank will rotate in the same direction as the chuci: carrying the work, and the camshaped ortion 24 of the stem will then move b v the p ug 27, or to the right, as illustrated in F ig. 4, said plug snapping behind the shoulder 28 during4 such rotation. When the thread of the Work has been completed a backward movement will be imparted to the turret slide, in the socket ofthe turret of which said tool-holder is mountedkand the rotation of the work will also be reversed. When this action takes place the spring 23, which was compressed by collar 20 during the forward movement of the tool-holder toward the work, is free to expand and force the same bacluvard by its action against said collar 20, and the shoulders 25 and 28 of the stem 11 and the plug 27 being in contact will prevent rotation of the tool-holder, and thus permit the rotary work-holder to withdraw the screw from the threading-tool. It fre-- quently hap ens-in thecommon construction's that wlien the holder A12 starts to recede, contact will be made with the endsl of the arms 5, thereby arresting the rearward movementof said holder and causing damage to the thread. To prevent this action the ends of the arms 5 are beveled or inclined as at '7, and the plugs 33 are also 'beveled or inclined as at 34, so that when the inclines meet on the.- return action ofr said tool-holder, the arms 5 will be raised on theirpivots 6, against the stress ofthe springs 9, thus enabling the plu s to slip by them and avoiding all danger of the arrest of the movement of the retreatinv tool-holder. l

n thejillustration given the shank 1, its head and the inclined and pivoted guidearms carried by said head may be termed the stationary member", while the tool-holder and. its stem may be designated as the movable member. It is obvious, however, that the relation of the parts may be changed in various wag's without departure from theinvention. o too while the means for holding the tool-holder under yieldingr pressure when the tool carried thereby engages the work are preferable, such means may1 be variousiy modified without departure from the invention.

lt will be apparent from the foregoing description taken in connection with the annexed drawings that my tool holder comprises a tool-carrying member and a head cooperative with each other each of said parts having a projectionwhich projections cooperate to secure a coupling relation between said two parts on the advancing movement of said tool-carrying member. One of these projections is yieldingly mounted radially of the tool holder and is en'gageabl'e by the other rojection on the backward movement of said) tool-carrying member during which action said yieldable projection is caused to positively retract by the companion projection so as to avoid injury to the parts as hereinbeore stated. While said projections are shown as du lieated this is not essential nor is it essentialpon which part of the holder the yieldable projection or projections be mounted although they are shown as carried bv the head of the im lement and consist of what l. have hereinbe ore termed guide arms. It is conceivable that in some cases the beveled tips ofthe yieldable members might be `omitted although their presence is very useful. So also these beveled portions might be otherwise dis osed within 'the spirit of my invention the atter contemplating broadly a member which yields or is retracted on the back-` ward movement of the tool-carrying member.

Changes may be made in the form and proportions of the parts, and the vinclines on the )lugs and arms may be of various angles diflerefnt from thse shown, if desired.

Other stop-devices may 4also `be provided as substitutes for the cam-shaped stein and plug without departure from the invention,

which is not limited to the precise details` illustrated and described.

Having tl'ius'described the invention what l claim is: j

1. A tool holder comprising a pair of members one of which has a forward and backward movement with respect to the other, a swinging arm on one of said members and a projection on t'he other member said projection and swinging arm being cooperative to secure a working relation between said members on the advancing movement of that one which moves forward land bachward andsaid )rejection serving to swing said arm on the acward movement of said member which moves forward and backward.

2. A tool holder comprising a pair of` members one of which has a forward and backward movement with `respect to the companion member, 'swinging arms on the latter member,. and deviceson the other member for engaging said swinging arms to secure a working relation between the members on the advancing movement and to e'led surfaces on t swing` said arms on the bacliw'ard movcltcnt ofV said mem'ber which moves forward and backward.

3. A tool holder comprising a. tord-carrying member and a head the lormer having a forward and backward movement with respect to the latter, a spring actuatedswing'- ingr arm on said head, a device on the toolcarrylng member for englaoi'ine` said arm .on

the forward movement ot' sind tool-carrying member to secu-rc a working relation between said two irst-mentioned parts and said dex'ice serving' to engage and swing said arni on the backward movement. of said toolcarrj'ing member whereby said backward movement can be accomplished .without obstruction.

4.V A tool holder con ing,r member and a, h vieldingly carried by s lat'erall)- beveled surta on .the tool-carrying m ing .capable of forward nd backward mov-ements with respect to s I d head and said projections bearing aainst said laterally beve forward move-ment of ad, swingingn arms 1d head and having es, and projections w said tool-carrying member to thereb)v oper- 4land head and also p engaged by sai projections being said head; springs atively associate lsaid t 3l-carrying member rniit tali-ning movement yof the fornter nd said projections :being adapted to eng` ge the tips of said swinging arms on thellreaiward movement of said tool-carrving member said tips where beveled- 5. The eombinationJwith a tool-carrying member having a reeeslsed stem, of a plunger mounted in the recess of the stem; a spring bearing againstl the rear end of the plunger; a support inl which the stem is mounted;l means for lpreventing `rotation between the stem and sup iort; and a device on the snppor't, and withrw ich the outer end of the plunger engages. i

46.I The combination, with a head having,r a tubular shank, of lever-arms pivoted to for normall)v holding said vrisine a tool-cari' tree ends; stops mber the latter be-4 vtheir ends at'lapted to engage the lever-arms in position parallel to thc'hcad; a tool-holder having u stem mounted m the bore ol" tho head and shank; and inclined stops carried by said tool-holder7 and in cn- `saeement with the lever-arms.

1. The combination, with ahead provided with pairs of separated projections, and chambers located in the ends of said head, of lever-arms pivoted between the j wrojections of the head, and recessed back of their pivots to receive springs; said springs; an incline on the tip o each lever-arm; a toolholdcr movable with relation to the bead; and inclined projections carried b v said toolholde-r. 4

S. The combination,with a head having a tubular shank, and-jnovided with separated projections, of lever-arms pivoted between the projections and having inclined for limiting the movement of said lever-ar1ns;springs bearing against the lever-arms back ol' their pivots; a toolholderj having a stem fitted in thel tubular shank of the head; and plugs carried by said tool-holder,l and having inclined upper ends for engaging and swinging said leverarins. l

separated projections, of lever-arms pivoted between said projections, and each having an inclined forward end; yielding devices for engaging said lever-arms and head; stops for limiting the Swingin@ movement of the lever-arms; a tool-hol er movable with relation to the head; and ,plugs carried bv said tool holder, and having inclines atA inclined ends of the lever-arms.

In testimonv whereof l allx my signature in presence o two witnesses, at Hartford, Ct. this 24th day of March, 1906.

V(.ILARENGE LEON GOODRICH.

Witnesses l. F. GALYIN, R. T. GIFFORD.

9. The combination, with a head having`

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