US1779035A - Lewis - Google Patents

Description

ln/wanton v Oct. 21, 1930.

H. H. DUTTON LEWIS F'il'ed June 14, 1926 Jamld JY. am/

Patented Oct; 21, 1930i.: p y 'i i' i. l Y Y! n vEn si. re ATENT f' HAROLD H. DUTTON,1OF -WASHINGTON. DISTRICT OF ,COLUMBIA LnwIs i l Application filed June 14, 1926. Serial No. 115,894.

This invention relates toa lewis designed ing fashioned into a loop or eye 4 thru which for luse in a single hole drilled. in the vcenter kpasses av-ligt'ting ring 5, preferably ofthe l ot the top of the stone in place of the two shape shown, which is freely movable lin the hole pin type lewises or other hoisting means loop 4. The sleeve l consists of a solid piece 5 which require more preparation and inconof metal', preferably grooved as shown at k6 55' venience in their employment. to ali'ord a -better grip orfthe hands of the The object or the invention is to vprovide a operator, bored out to allow the insertion of lewis which may be generally inserted into the rod2 and reduced in section toits lower and removed from a single hole formed in part to form the eXpansible leaves7 by being v10 thetop of the stone, and one which will be slotted by a plurality of cuts 8. Theleaves 60jV i automatically tightened under the action of 7 are tapered on their inner surfaces asfshown the weight of the stone itself, the construcat V9, the particular degree of slope chosen `be-` tion being such that an increasing pull on ing one of the importantteaturesof the de-y thel lifting ring will Vcause an increasingly Vice, as will be shownlater. On the extehigherV pressure of the'jsides of the device rlorof the leaves 7 Aat the lower end isl formed 4k65 against the walls offthe hole so that thel a'circumferential projection or ridge 10, 011 possibility of slippage or dropping `the stone being shown here, although a plurality of the is'entirely eliminated, and further so to consame may well be employed. `Thisridge or struct the lewis thatit may contain within projection is made a certain ysize correspond,- y

itself the means'necessary vfor its immediate lng t0 the diameter Of'th hole intended t0 70 releasey from the stone into which it isvin-` be. drilled in the stone, the purpose of this serted after the said stone has been hoisted `appearing later. The SIQBVG l S freely IlflOV.- y into place, i n, v ablev vertically .on the rod'2 within-conven- The invention also consists in the novel ient limits, depending on the 'desired' dimen- 725 features of construction and combinations oitl SOIl Of the PrS'vWh the IGSIC'UOD that it 75 i v parts hereinafter set forth, pointed out in the must be capable of entire separation '"trom the claims, and set forth in the accompanying @Xpaldeljnut 3. i l drawings toriningja part oflthisspecication .The rool 2 has its lower end threaded or and infwhich: i I otherwise arranged to jmale possible the at- Y '30 Fig. l is a verticalelevat-ionjof the device, tachment of the eXpIldoI hut '3; This 111113 8,0

the parts beingshown in the unexpanded po- 3 is of conical shape asshown, the inclination Y sition vready for insertion in the stone, the of the sides beingY suitably chosen With' 18- y position of the lifting ring whenused as a Spect to the tapervof the leaves-7 in CCOrClhammer being indicated bydotted lines, ance with an importantl featureV of this deil Fig. 2 is a vertical elevation'andrpartial Vicetobe later described'. l section showing the arrangement of the parts In use the lewis is inserted inv a hole drilled whenrthe lewis is inserted in the hole in the in the center Vof the top of the stone to be stone but prior to the lift being made, Y litted,"it then being positionedy as in Fig. '2, g Fig. 3 is a vertical section thruthe sleeve the projection or ridge lOnow being in Lconi 40 and expander nut showingthe positions of tact-with the sides ofthe hole and the `rod 2 90 the several pieces when the lewis has been held up by thevring 5 atv the topofthe loop tightened and is readyfto littthe stone, and 4 so that the expander nutf3 i'sjustentered Fig. 4 is a sectional view on the line 4 4, within the leaves 7. By holding the sleeve of Fig. l looking in .the vdirection of the arl 'with one hand 'and pullingv upward on rows. the ringf with the'other hand' witha hori- 95 In the drawings, the lewis comprises a z'ontaltwStiIl'g motion the operator `Will slidable slotted sleeve, designated generally cause the leaves -7 to be forced outwardly l, thru which passes a rod 2, to the lower end by the further introduction' of the nut 3 into of which is attached an expander nut 3, of the sleeve l and the ridge l0 will either press 5@ conical shape, the upper end of the rod 2 beincreasing firmly against the side walls of 100 Y the hole, or may be actually forced into the stone if it berelativelysoft. The lewis will then appear as in Fig. 3 and the liftmay iiow be-made by theY hook of the hoisting tackle engaging the ring, 5 and drawing it upward, it being easily seen that the greater the pull on thering4 5 thruthe tackle, the more tightly' will the nut-B wedgeitself Vbetween the leaves 7 and there exert more and .a more pressure against the sides of the' holes 1 and Vthus further Vassure thefpositiive holding action of the device. l

byfreason. ofthe latter engaging the inner wallpa at one point only, l have provideda certainslzope on the interior of the leaves as shawn at 9 and' a slightly-divergent slope for the sides of the nut 3 based on calculated observations of the relative positions of the partsi. and 7 .when under load, the ldiiferent inclinations of the two Vfaces inalringV possible the exact coincidenceand extended con- Sil tactv ofthe interior facet) of the sleeve 7 and the sides of the nut ,3 when in the expanded condition..t This exact coincidence of the contaettnrg surface will provide adequate entended. Contact `betweenV the parts under all conditifonfs.j of lifting whethersniall ,orlarge loads are to `be handled, thus providing against distortion or iiijnry to the lewis when `in use.

lin practical work ithas been found desirahletohave a. 2 Vtaperonthe interna-l surfacev of the sleeve 9V anda 8? taper on the surface of the` expander nut 3 these particular proportions-.accomplishing the intended purpose of providing the extended contact between the internal surface vof theV sleeve 9 and the-expanderv. nut 3., lt is conceivable that other Yan sets of tapers might well be employed, the abovefmentioned lguresmerely being noted asfione practical combination.. p ,Y y Having moved VVthe'nstoneto its required position and the tackle being unhoolred, the lewis may. beinstantly'removed by using the lifterring- 5- as. a hammer to tap upon the lowerend. of theloopV l inthe rod 2, thereby caus- Y ing the expander nut 3 toloose itselfl from they leaves 17 Vwhich will then return yto their nermalv position `and: allow the sleeve Vto be' remowied Vfromthe hole. a tothe 'novel means by whichthe lifting itself is accomplished, :I havealso incorporated an arrangement of parts which eliminates the necessary ofeinploying a hammer or: other @tools to remove the lewis `after use. i Whilel. have illustrated and describedone preferred formi of my invention, it will be evi-dent that` numerous variations in form and. proportions may be made wit-houtV de-V parting from the scopeof the `invention as" defined. inthe .following claims. l Thus, the ridgeorv rib 10 may beei-thenpontinuous or Thus, in addition Y inve-,oet

interrupted A'and the complementary faces of fthe leaves and expander nut may have a crosssectional form other than thecircular form shown in` Fig. 4., As above indicated the slopes given these; faces maybe increased where found desirable so long as the degree :freedom frein-distorting" leaves and at v flthe same time an increasefofpressure ap- Now, in order that the leaves 7 may not be'Y bent or otherwise distended.v when spread1` apart thru the entrance ofthe expander nut onY one end. and loop on the other end of said I rod; .a sleevel slidable on Lthere-d, said sleeve being slottedy at. one end and having an internal taper in extendedAV contact -with'` the conical. expander nut, and a ring held in said loopsaidV ring being movable longitudinally of thelloop into'striking engagement with either end thereof. f

, 2.. In. a lewis,. arod having an elongated eye formed at. one .end`,ran expander nut thereon, a sleeveA slidabl'efonfthe"rod, said sleeve being slotted at one end and having anV internal taper in extended contact with the expander'nut, an outer engaging means consisting of a circumferential ridge, and a lifting ring in the eye on saidrod. i

3. Y fnl a lewis,.a rod, ,a'tapering` nut thereon, a sleeve slidable on` the rodand over the nut, said sleeve beingslotted `at* one endtthe said'end havingV a taper slightly less than that of thenut. v p j a 4. In a lewis,- a rod, an Vexpandernut therely carriedby the rod and movable longitudinally withrespectto therod to cause theV nut to travel out of the sleeve.

on., an eXpansible-sleeve carried on the rod v and sli'da-ble over the nut?V lifting means looseon,A a 'sleeve slida'ble on the rod and 'over the i nut`,said` sleeve being expansible at one end,

the said end havinga taper slightly less than A1:

engaging ridge. Y

that of the nut `and-'a'relatively narrow outer 6. In: a lewis; a rod', a tapering nut thereon, an expansible s'leevegislidableion the rod and over thefnut, andthe sleevel having an internal taper suiiicientlylless than that'fof the nut to bring their epposing surfaces into eX- tended coincidence 'when the sleeve is expanded over the nut. e v

In witness whereof l have hereunto affixed my signature. 1 a

j 'Y'HVAROLD H. BUTTON.'

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