US2329932A - Tool support - Google Patents

Description

mined 'irelationpto another element such Patented Sept. 21,1

, .TOOLSUPPORT Edward'F. Nelsomvallejo, Calif; Original application May :1, 1940, Serial No.

.. 338,179, now Patent No. 2,287,818, dated June V30, 1942. Divided and this application. September v13, 1941, Serial No. 410,793

. :Cla'Lms.' (CL 248-125) This invention relatesxto supports for holdin an element, .such as a .tool, in a certain predeter- :.as the =worktorbeoperatedupon the tool.

The "disclosure :of invention herein originally formed part of, and was divided irom, myprior applicatiomserial No.- 338,179, filed May 31, 1940,-

now"Patent.No. 2,287,818, datedJune 30, 1942.

Itis an obi'ector .the invention tolprovidea quick-acting support by meansiof which a tool -may "be'rapidly positioned'in operative relationv shiptothe workto be'operatedupon.

- Another-objector .theinvention is toprovide an improved-clutch iorsecuring together a'pair Poirelativelynadiustablemembers of a work support. Y

inventionpossesses other objects and teaturesot advantage which, together withthe foregoing, will .be specifically brought out inthe detailed :description. of the invention Jhereunto annexed. It is tobe understood thatthe invention .is not "to be limited to thespecific i'orm thereof herein .shown and described as variousother "embodiments thereof "may be "employed withinthe scope of theappended claims. Reierringtothedrawing: Figure .1 is. a vertical sectional view'oi' the tool support of my invention. The tool carried by the support is shown in dotted lines and the base structure, upon which the tool support may rest and upon which the tool may operate, is also shown in verticalsection.

bolt nuts would permit water to seep through v the bolt holes thus .rusting the --steelsubstruc hire or hastening rotting of. the wood in .con-

tact with; the steel. 'Inalater andimpro'vedconstruction a series of threaded studs were butt welded directly itothe surface or the steel substructure thuseliminating the through bolt. holes and dispensing with th services oi the holder-on vfor. securing the hold-down bolt against tuming. This procedure however required that the wood overlay, .aite'r-thehol'd-down studs were placed, .be properly, positioned over the studs, tappedso as toim'press .the ends or the. studs.

. into the underside oithe wood. beremo'ved and bored at the .impressionseto :provide the stud apertures, and then .be replaced on the studs. hold-down nuts werezthen threade on the studs thus securing the wood and 'thesubstructure together. .This series of operations co sumed nearly as muchconstruction time as did the older throuahe'bolt system. .Inymy prior Pat; .entiNo. 2,191,494,.issuedFebruaryQ'l, 1940, it is pointed out how considerable time-oanqbe saved in overlaying steel structures witliwood or other covering material by preiormingin the coverlng the desired number of stud apertures, then placing the covering in its ultimateposition on the steel substructure and then electrically butt weldingthe studs to the underlying steel' through and concentrically oi the apertures in the covering. ,Thus, immediately..aiter the studs areiweld- "Figure2 is a transversesectional view, to an enlarged scale, of the portion of the support lying in the plane indicated by'the line 1- of Fi ure 1.

Figure 3 is a transverse sectionalvie'w .oi' the portion of the support lying in. the plane indicatedby the 1inei:3--3 of Figure 1.

In building construction, and inshipbuilding,

where steel plates or bars are to be sheathed or overlaid with-wood, it hasbeenthe practice heretofore to..flrst ;posltion'the wood over-thesteel substructure, drill holes'through the wood and steel. andlthen .place in these drilled holes suit- .able bolts for permanently securing the wood .to thesteel. The placement or removal of such retaining bolts required the services of twowork ..men sinceonehadvtohold the boltagainst turning. from the underside of the substructure while.

the other, from .above,.- app'1i ed and vcinched the nut. Such procedure consumed considerabletilne andseriously sloweddownproduction. Further! more, if .thewood was'exposed to theweather,

only a slight loosening of one or more of the edv in place, the hold-down nuts maybe applied to the studs and tightened. u c

It is vitally. important, since the weld which adjoins the stud to the steel substructure is being made in the bolt aperture; and :i's .thereforeob scuredi'rom ,theview of, the operator, that the distance the stud is drawn away from/the steel, in creating the welding arc be very accurately and uniformly maintained for each' successive weldii uniiormlyflstrong unions are tobe'had' between the studs and the f'steel substructure. In prior devices, thewelding head, in which the stud forming one 'electzlodeoi the welding circuit washeld, was supported -;on a stand or "tripod which rested on the upper surface oi-thewobd- "overlav'withthe stud projecting downwardly into the stud aperture. "Suitable stops on guides in the weldingheadpermittedathe stud. aiter' contact- .ing the surface of the steel substructure, to be Idrawnupwardly a predetermined distance seas to establish. thear'c gap between theend of the stud and the substructure. fThe adjustment oi ;.the su rt or tripod, when once set, did not re- .quire' variation provided the thickness oi the E; provided withapertured'lugs rehearin a clamp Thegrip 21 provides a handle for the operator 2 assacsa wood overlay was uniionn at the'points where Means is provided ior securing the tool in a the successive welds were made. However, it has selected elevated position. Secured at its upper been found that the thickness of the wood varies end in the-recess II, by the clamp bolt 28, and considerably more or less so thatthe positioning 7 v positioned withinithe' tube I1, is acollet sleeve of the'end of the stud relative to-the surface of: 5 3i, Whichextends downwardly in axial concenthe steel substructure also varies thereby caustricity with thetube ll, terminates adjacent the ing variationsin the arc gap and adversely af-A ,lower end of the latter, and telescopes within testing the quality of the resulting weld. I have 1 Y the post H. The lower end ,ofthe 'collet sleeve provided a quick-acting support for such a weldisprovijded with a plurality. of circumferentially ns head, or any verti alee o ary or reciprol spaced, axially extending slots 32;" and with a eating tool whose operation is to be started from tapered countersink 33 forming a continuation a predetermining position relative to the work or the'internalbore 34 ot'thesleeve- This conto e op ted p m which permits practically struction providesaplurality of'radially flexible instantaneous adjustment of the starting-posh; flngers at the lower end .of'th'e collet sleeve. tion 01' the tool regardless of variations in the 1 Positioned concentrically withiiithe collet sleeve thickness of the wood overlay thus insuring that is a controlrod 36 secured'to'the lower threaded each weld or other operation is uniformly-sinnend 31 or which is a irustoeconical plug 38 comlartothepreceding one. plementary with and engaged in the tapered In detail,- I have shown in Figure 1 a steel; f countersink 33 of the colletzsleeve, The upper p a or stru tural ar 1 ov rlyi w c end 39 of the control" rod '3' passes slidably wooden plank or other such member Shaving an thr h a, e tral gpertur rormed in a washer aperture 1 e tending therethroucn into-w ll which rests in anxed' ositienj paced from the threaded stud 8, which is to bebuttrwelded the upper end oi- .the*collet si'eevej',flagainst a to t e. upn rsu face oi the plate {may lie-in shoulder iormedwithin the bore otthe collet serted. Asuitable shouldered nut,'not sh0wn, jsleeve. A nut .42 ithteadecl on the'extreme is adapted-t0 be fl d y ns ywithh upper end of the control'rod 38 and interposed pper end oi the stud 8, after the l'att -h -s between the nutjiiihd thewasher H is anexwelded in position concentricallyohthe ten ion springfla Th m su i'orthe'purture I, for securing the wooden plankl' {pose of urgingth -controlrod 3i' iipwardly"in a plate 4 together. The plate 4 forms on I elece direction x allybi" thez colle t sleeve 3| so as-to trade of the welding circuit WIIHG ithBf -StUdf B drawthe'pluglldfinto'theforms the other electrode jthjereot audit lathe by radiallyfv urging th exible fingers of the function'of mechanism termedthe'weldii g head colletiisleeveinto 'tlg rltitional enga ement and generally indicatedby'the numeralfilof Fig.- with {the irmer perip "ery o f 'the post II. This ure 1, to, 'first, hold*th'e. stud lgin contactwith' 5 looks tl' fiii'r'n ojrableLtu and the post i4 against the Surface sp fl 'l ljhdwelding cur-g; relative ongitudi'ii' displacement and also holds rent is turned-on, secondly, toj draw the "stud gdflmio'r other tool carried by the away from the plate to create an=arc gap, a nd iir n'l'y .in the desired elevated pothirdly, alter the end of the stud and the cop theevent that a tool of considerable fronting surface or the plate have beenbro'ught to the fusion poi t y the arc flame, to q k y lthefingerscontacting the post 14 may be knurled .1 11 the melting members so as to efiect a union V's-"so" as to bite into the surface of the post and thereof. e g 1 g obtain maximum grip between the en- During the welding cycle the welding head 8, h ,p'arts. with the exception of the reciprocatin 'l'fim 1 Means is provided for releasing the frictionally thereof and the stud 8, are rigidly supported in onn'e'cted'pos't H and tube [1, to permit raising a fixed position. This is accomplished by la. .and'lowering of the tool 9, and means is further supporting structure comprising s are- 2, whic rof'v'ided for partially counterbalancing the rests on the upper surface of the woodemovc jeightof the tool to lessen the force required to lay 6, having therein an opening li pthrblllg the latter. Positioned within the recess 2 which the stud 8 may be raised and lowered, and "and" between the concentric tube l1 and collet an upwardly rising tubular post ll whic is se sleeve 3|, is a short tubular filler l4 and the ascured, at its lower end, to the base byja -screw" 'sembled tubular members areeach provided with It. --Telescoping over and slidable axially of? 'ialined apertures which form, as shown in Figthe post I is a tube 11 having thereon apair- .011 5 ures 1 and 2, an opening .45 through which passes spaced brackets, each comprising a split collar a release lever 41. A pin 48, having its opposite It secured to the tube by means or a clamp screw ends seated in holes drilled into the tube l1 and I! and having extensions 2i suitably termed to the filler tube ,extends transversely across the accommodate] and engage the particular .tool to opening 46 and through a journal aperture bored be supported. A key 22, projecting through a in the release lever so that the latter is pivotally suitable opening formed in; and adjacent the mounted on the pin. The inner end or the relower end of the tube l1 and enteringa kfeyway lease lever is bifurcated to provide a pair of 28 cut longitudinally in the periphery of the post fingers J9 which bear against a washer 51, sell,-serves to prevent ,relative rotationi -between cured to the control rod 36, and the outer end the tube and post and thereby-tomaintain the 52 0f the release-lever is extended substantially tool or welding head 9 in axial concentricitywith parallel to and outwardly substantially equal to the base opening it. The upper end of the tube the extent or the grip or handle 21. When the i1 extends into a bored recess 24 formed in a operator desires to raise or lower the tool 9, he hubji having a radially projecting grip 21, and extends one or' more of the fingers 01' his hand the hub 28 is split axially or therecess 24 and resting on the grip 21 to engage the outer end 52 of the release lever and draws the said outer end of the lever towards the grip. This causes the fingers 49 to movethecontrol rod 38 downwardly so as to move the plug 38 out 01! the 'l tion '--bolt 29 for clamping the tube I! in the recess 24.

so that new raise and lower the tool 8 with respect to the base I2. 76 countersink 33 thereby releasing the radial prescounters'ink 33 there flweightisybeing used; the'peripheralsurfaces of sure of the collet fingers against the inner wall of the post. With the base I 2 maintained in contact with the surface of the wood overlay I, the tube l1 and the various parts, including the tool 9, carried thereby may be shiftedlongitudinaily of the post to any desired position; Re

lease of the lever extension m sgam set the friction lock to secure the tools in fixed relation to the base l2. An axially expansiblespring 54, positioned within the tube I1 and'ir'iterposed between the ends of the post and the filler tube 44, respectively, 'serves, when the friction lock is released, to urge the tube i1 and its-connected parts upwardly thereby partially counterbalancing the weightof the tool 9 and 'fac'ilitating its vertical adjustment with greater ease,

, a As was stated above, a uniform arc gap should be maintainedin' successive welds if eachweld is Wise the maximum or strength; As many described in my above-mentioned prior patent, the, mechanismof the welding head sis pre -set so that the lower endjof'the stud 8 rests on the upper surface of the steel substructure 8. Whe'n sleeve, pressure means interposed betweensaid the welding current is turned on, action takes place within the welding head,and 'while'the latter is held rigidly fixed with relation tothe steel substructure 4, whichirnoves the stud-l=to a position elevated above'the substructurelqfto create the arcv gap betweenthe stud andsubstructure 4. The length of this arc gap is usually only a small fraction of an inch and is chosen to produce the desiredarc flame depending upon the collet sleeve being concentric with the upper tubular section and telescopically engaged with the lower tubular section, said collet sleeve, further, 'atits'jf lower end, being provided with a taperedbore and a plurality of longitudinally ex tendingslots"circumferentially dividing the collet sleeve intofaifpluralityoi radially flexible fingers, a complementarily taperedplug in said tapered sleeve bore, a control rod connected with said plug and" extending axially along said collet control rod and said collet sleeve for urging said control rod in one direction axially of the sleeve,

to pr ess said plug into the said tapered bore of thei-sl'eeve and to expand said fiexiblefingers ti'on, manually operable means carried by said per tubular section-and connected with said ontrol rod for urging the control rod'in an oppote direction to radially contract said flexible rangers, and an apertured base on aid lower support section for engaging a surface to support aid tool in position above said surface.

telescopically engaged with said upper tubular section and slidable axially thereof, a collet sleeve amount of welding current available." -;lt will be seen that ifthe distance"betweenfitl i liupperx of raised seams, protuberances o "depressions in the surface of the substruc coincide with one or -mo the depths of all of the, pe will not be alike. Using previouslyfkn equipment, work was s riously retarded by- 'the'n' iiirement that the workman, before makingeach weld, measure the depth of each hole and set the welding head support accordingly to 'fprovide the desired arc gap. With the support-of-{my invention, it is only necessary to place the base I! in position on the planking 8 over theape'rture 'I and release the friction lock betweenthepost l4 and the tube I! so: as toallow tneg v aperture I I ,until it 'j ust. touches the upper surface ofthe substructure "4. f'The lock may be then reengaged, since, the. stud is now positioned to provide the correct length of arc gap when it is drawn away from the substructure bythe lifting mechanism within the welding head. It will be therefore'seen that a workman may quickly set the apparatus for each individual hole in which a stud is tobe mounted; without appreciably cutting down his production speed. 7

Having thus described my invention in detail,

what I claim as new and desire to secure by Letters Patent is: i

1. steel support comprising an upper tubular section,-' means. on said upper tubular section for connecting a tool thereto, a lower tubular section telescopically engaged with saidupper tubular section, and slidable axially thereof, a collet sleeve; carried by said upper tubular section, said ud' t to descend into the carried by said uppertubular section, said collet sleeve being concentric with the upper tubular section and telescopically engaged with-the lower tubular section, said colletsleev'e, further, at its lower end, being provided with a taperedbor'and a plurality of longitudinally extending slots circumferentially dividing the collet sleeve intoa plurality 0f d llrgfl xible fin ers. a comples mentarily tapered plug in said tapered", sleeve bore, a control rod connected with 'saidplug andextending axially along said collet sleeve, pres sure means interposed between said control rod and said collet sleeve for urging said control rod in one direction axially of the sleeve to press said plug into the said-tapered bore of the sleeve and to expand'said flexible fingers radially into engagement with said lower support section, a hand grip connected with and extending radially from said upper support section, a release lever pivotally mounted on said upper support section ad- I iacent said hand grip and connected with and to move said control rod downwardly relative to the upper support section to move said tapered plug out of said tapered bore so as to radially contract said flexible ilngersfrom engagement with said lower support section, and a base carried by the lowersupport section for engaging a surface so as to support said tool in position above said surface.

'S A- tool support comprising upper and lower sections slidable one on the other, laterally extendingmeans ontheupper section for mounting a' tool at the side thereof, means for look-- section, and means for releasing the locking-- ;means disposed adjacent the handle.

4. A tool support comprising upper andlower sections slidable one ,on the other, laterally extending means on the upper section for mounting a tool at the side thereof, means for locking the two sections together, a handle by which.

radially into engagement with said lower support,

2. A tool support comprising an upper'tubular' section, means on said upper tubular section for connecting a tool thereto, a lower. tubular sectioneecti'on above the tool and adjacent the bandle.

5. A tool support comprising upper and lower sections slidable one on the other, means on the upper section for mounting a tool thereon, a spring interposed between the two sections to counterbalance the weight of the tool carrying section, means for locking the two sections together, a hand grip by which the support and attached tool may be carried disposed on one of the sections, a base disposed on the lower section, and digitally operated means adjacent the hand grip for releasing the locking means.

6. A tool support comprising a single tubular section, a second section comprising a pair of concentric spaced tubular members between which the single section is telescoped, a base fixed on one of the sections, a hand grip fixed on one of the sections, means on one of the sections for mounting a tool, spring pressed means for locking the two sections together, counterbalancing means for the tool carrying section interposed between the sections, and means for releasing the spring pressed locking means arranged -adjacent' the hand grip.

7. A tool support comprising a single tubular section, a second section comprising a pair of concentric spaced tubular members between which the single section is telescoped, a base fixed on one of the sections, a hand grip fixed on one of the sections, means on one of the sections for mounting a tool, spring pressed means for expanding the inner tubular member against the surrounding tubular section to lock the two sections together, a counterbalancing spring disposed between the concentric tubular members and interposed between them and the single tubular section, and a digitally operated lever adjacent the hand grip ior retracting the e:- panding means to release said lock.

8. A tool support comprising upper and lower sections slidabie one on the other, means on one of the sections for attaching a tool on the side thereof, a handy grip by which the support and attached 'tool may be carried, said hand grip "being fixed on the tool-holding section and extending laterally'thereirom over the center of gravity of the combined support and tool, a base arranged on the other section and extending laterally therefrom beyond said center or gravity, said base beingrecessed to permit passage therethrough oftool parts, spring pressed means for .lockingrsaid sections together, and means adjacent-the hand grip for releasing said locking means,

9. A tool support comprising upper and low.- er sections, a base fixed on the lower section, means on the upper section for mounting a tool, the upper section being slidable on the lower section to position part of the tool below the base, means for locking the two sections together, a hand grip by which the support and attached tool may be carried, and means for releasing the locking means disposed adjacent the hand grip.

10. A tool support comprising a lower tubular section, an upper tubular section slidable within the lower section, a base on the lower section, means for mounting a tool on the upper section, a hand grip on the upper section, a rod in the upper section and terminating in aconical plug arranged in. the lower end of the upper section, a spring interposed between the rod and the upper section to draw the plug into the section to expand it against the outer section, and

digitally perated lever adiacent the hand grip' free the plug.

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