US2644226A - Textile roll assembling and disassembling apparatus - Google Patents

Description

y 7, 1953 R. R. ELLIOTT, SR 2,644,226

TEXTILE ROLL ASSEMBLING AND DISASSEMBLING APPARATUS Filed Dec. 30. 1948 2 Sheets-Sheet 1 'INVENTOR. RoberfREfliot'iJ/r:

ATTORME'I July 7, 1953 R. R. ELLIOTT, SR 2,644,

TEXTILE ROLL ASSEMBLING AND DISASSEMBLING APPARATUS Filed Dec. so. 1948 2 She ets-Sheet 2 r- 1 HI L INVENTOR.

5 Aj'TOHEY Patented July 7, 19 53 TEXTILE ROLL ASSEMBLING AND DISASSEMBLING APPARATUS Robert R. Elliott, Sr., Pawtucket, R. Lya'ssignor, I

by mesne assignments, to

Whitin Machine Works, a corporation of Massachusetts Application December 30, 1948, Serial No. 68,358 1 Claim. (01. 29238) This invention relates to a portable apparatus and to a method for assembling and disassembling lengthy sectional textile rolls, and especially has to do with that form of rolls which are known as fluted rolls used in the drawing mechanisms of such textile machines as roving frames and spinning frames. The present invention has particular application to the roll coupling organization disclosed and claimed in my copending application, Serial No. 763,589, filed July 25, 1947, nowabandoned.

Textile rolls of this class customarily are arranged as the lower drawing rolls and as the back feed rolls in the drawing mechanisms of the aforementioned textile machines, in which instances they are positively driven, usually from one end, for rotation in' open top bearings formed in a series of spaced roll stands which are fixedly mounted upon the usual roller beam at one or both sides of the machine. In the majority of cases, these rolls are small in diameter and they form parallel lines extending longitudinally for substantially the entire length of such machines; the length of the individual rolls of each line varying from ten to forty-eight feet, or longer, depending uponthe length of the particular machine upon which they are installed. In making up each line of these long, slender rolls, the present practice is to connect end-to-end a number of relatively short roll sections to form a continuous and complete roll assembly. Each section of' the short roll components of these lengthy rolls is formed throughout its length with a series of alternate cylindrical neck portions and enlarged longitudinally fiuted strand engaging portions in which some of the cylindrical neck portions may be of greater or' less diameter.

than the others to serve as .the bearing surfaces or journals for these rolls intheir respective bearing stands.

Various coupling devices have been proposed for uniting the adjoining roll sections end-toend in rotation-transmitting relationship, one common practice being to provide one roll section on one end beyond the journal bearing with a square shank or tang of .a size adapted to have adriving fit within a square socket'formed in the opposing end of thenext adjacent roll-section. Another arrangement in current use is to provide in the opposing ends of two adjacent roll sections cylindrical holes drilled in axial alignment with each other and with therollsecticns',

and to press into these holes with an. extremely tight-forced lit 'a cylindrical, journal member which unites the roll sections'to form an integral roll assembly. Another textile roll coupling arrangement is that shown in my copending application, Serial No. 763,589, filed July 25, 1947, which is an improvement over the joint structures above described in that the opposing ends of adjacent roll sections are formed with precision square shanks or tangs in axial alignment witheach other and with the roll sections and pressed into a precision broached square hole extending axially through a sleeve-like coupling member which carries upon its exterior a fluted boss, the shanks being machined to make an extremely tight pressed fit with the sides of the squre hole in the coupling and forced home there-' in from opposite ends thereof.

Considerable pressure, naturally, is required to secure these tight-forced fits and assemble the parts; Where multiple sections of the rolls are assembled for the first time such as, for example, during building of the textile machine, this is a comparatively simple matter because large, heavy presses can be used without special diificulty but such presses due to their size and weight obviously cannot be used in the field for joining sections of rolls in situ upon the textile machine when installations of such rolls are made thereon during erection or repair operations.

The present invention, therefore, has for one of its objects the provision of an improved roll assembling and disassembling apparatus which will be sufiiciently powerful to force together tightly or to spread apart the interengaging forced-fitted coupling parts of adjacent roll sections and which, at the same time, will be small enough and light enough to be readily portable.

and moved about' from machine to machine to be readily handled thereon by the fitter in making or separating roll joints.

Another object of the invention is to provide a portable apparatus including a hydraulic press which shall be adapted to be applied to the usual metal angle roller beams or rails which support the roll stands inwhich are journaled the relatively long sectional textile rolls of the machine.

The present invention has for another of its aims to provide a demountable hydraulic apparatus which can be selectively positioned upon the longitudinal framework of the textile machine' relative to any two adjacent roll stands and will be so arranged as to establish pressuretransmitting relationships with some of the necks and fluted portions of the roll sections associated with these roll stands to press together or force apart the joint. structure of said roll sections by "means of hydraulic action applied thereto in 9.

3 manner to produce axial movement of one of the roll sections bodily relative to the adjoining roll section in an appropriate direction to effect either union or separation of such forced-fit joint structures of the type above described.

The nature of the invention will be readily understood from the following description, when read in connection withthe accompanying draw--- ings, and the novel features will be particularly pointed out in the appended claim.

In the drawings:

Fig. 1 is an exploded view of sufficient of the drawing roll joint structure of my copending application, Serial No. 763,589, above. referred. to, to illustrate the purpose of theapparatusof the present invention;

Fig. 2 is a plan view of aportablehydraulic apparatus embodying the present invention applied to the roller beam of a spinning frame for carrying out a roll assembling operation;

Fig. 3 is a sectional view.taken substantially onthe line. 3-3 of Fig; 2 but on. largerscale,-

to the usual roller beam 21 of the spinning frame and to support the press 25 in one of several selected elevated positions above the roller beam 21, the purpose of these diiierent vertically adjusted positions being more fully set forth in the subsequent pages of the present specification.

The brackets- 26; and 26" are ofv identical construction so that the description of one will suflice which the complete long sectional rolls, after showing a side elevation of the portable roll' assembling and. disassembling apparatus illustratedin Fig. 2, in which portions of one of, the support brackets. for t'hepress is broken. away to-expose details of the mechanism, and with oneof: the roll clamping devices being shownin an opened position;

Fig. 4-'is' a front view ofs'one of the adjustable platform brackets shown-in Figs. 2 andB for supporting the portable hydraulic press during roll assembling and disassembling operations;

Fig. S lsa-plan view of one of the roll clamping devices shown in Fig. 2, and

Fig. 6 is a longitudinal sectional. view. of the roll clamping device shown inFig. 3 shown in aclosedpositiori when gripping a roll section during use of the hydraulic apparatus. of the present-invention.

Referring to Fig. 1, this figure illustrates por-. tionsoftwo-roll sections to be joined or separated, asthe case may be,- the joint structure: of theserolls embodying theinvention disclosed and claimed" in -my 7 copending application, Serial No.- 763,589'filed July 25,- 1947. As-illustrated, this joint arrangementcomprises two roll-sec-- tions l0 and I2 and an intermediate-tubular or sleeve-like coupling member I 3', the opposed ends" of the roll sections I0-and I2 being provided-with the square shank-portions l4- and" l5respectivel-y. Theron-sections ID and'l2 areotsmalldiameterand'carrya seriesof alternateenlarged-longiand l 'i respectively; The coupling "sleeve l3 isprovided intermediate'its-ends with-an enlarged fluted strand engaged-fluted bossl8-ateither-- tudinally strand engagingflutedbosses l6 and 16" respectively and reduced-neck-portions l1 side of which are the reduced cylindrical end portions 23" and 2| respectively. Extending axially through'the coupling member 13 as abroached hole or bore 22 into which is pressed tightly fromeach end the-square shanks M'and I5 onthe roll sections Ill and I2 respectively. Fig. 2 illustrates the portable roll assembling and disassembling apparatus of the present in--- ventionin its normal operatingposition applied. to theroller beamof a conventional spinning-- frame and readied forcarrying out a roll as-- sembling; operation. As illustrated, this roll as sembl-ingand disassembling apparatus comprises a portable hydraulic press mechanism per-se andgenerally designated by thenumeral'25, and

a pair of vertically adjustable platform brackets 26 and- 26' which are arranged for attachment assembly, are installed for rotation on the spinning machine. The two; roll sections to be joined are here shown detached and with the intermediate fiuted couplingsleeve. I3 previouslypressed; onto the square shank: l5'of the roll section 12:.

Consideringnow Fig. 3 the bracket'zfiis show-m as comprising an angle clamp 30 having abody portion 3|, the upper part ofwhich'is; provided. with a transverse projection 32,.adaptedzto seat; firmly on the top face of the roller beam; 21;. when the clamp 30 is appliedthereto withits;

body portion 3! in contact with the'dependingleg;

33 of the beam. The lower part of thebodyiporgea tion 3! has an inwardly directedoblique-iootfl in which is mounted a clamp screw 35 which;

has screw-threaded engagement in a boss 363at; the outer end of the footv 34. The screw 3511s" provided at its outer endwith'a hand knob: 3.1. whereby the screw 35 maybe rotated to bring:

its rounded inner end to bear against the filleted:

an upstanding standard when the clamp 30'is; applied to the roller beam 21.. When thus-mount? ed, the platform 40 maybe selectively positioned;

by being raised or lowered into-any of various:

vertically adjusted positions A, B, or.-C'." (see Fig. 3), and secured by pin 43 inanyof: these positions with its top surface substantially; coincident with a horizontal plane tangentwith the bottom of theusual roll stand bearings.,45;. 46 and 41 respectively. Pin 43 is positionable;

selectively in any one of a series of transverse.

holes 48, 48' and 48" in therod 4|.and thepin 43 is arranged to be manually retractable axially of};

the tubular extension 50 on the standard 42:.- against the compression-of the spring 5| housed:

within the tube 50.. The holes 48 arespaced: at such positions along th rod 4| whereby the; top? surface of the flat platformflfl ineach of its yertically adjusted positions will lie in a horizontally extended position and will. be substantially tan-l gent to'the bottomof the bearing recesses inqthe": several roll stands 28 and 28 in-which rotates.

the particular roll being assembled or-separated., The pin has secured at its outer end a-knurledv. knob 53 wherebythepin-43 may be retractedby': the operator from anyof-the holes-48, 48.. or 481' when it is desired to raise or lower the platform 40 after completion of the roll coupling or separating operations of a, completed roll and preparatory to performing subsequent coupling or disassembling operations upon another line of long rolls which are to be journaled in the same roll stands. In use, the portable press 25 is transported bodily by the fitter to the roller beam 21 and laid in a bridging relationshipupon the forward extensions of the fiat platform members 40 of th stands 26 and 26, the'top surfaces of the respective platform members being pre-set so as to lie in horizontal planes which are substantially coincident with the bottoms of the respective bearings 45 or 46 or 41, as the case may be, of a pair of spaced roll stands 28 and 29' in which the particular line of roll sections thus assembled or to be parted rotates.

Referring to Figs. 2 and 3, the hydraulic press organization 25 of the roll assembling and disassembling apparatus of the present invention consists of a portable hydraulic ram unit generally designated 55 and a pressure-transmitting mechanism comprising a rail structure to which is fixed an abutment 58, and three roll clamping devices 59, 59 and 59 of identical construction, the clamp 59 being fixed to the rail structure 51 and the clamp 59being adjustably clamped at various ositions along the rail structure to suit the neck spacing of the roll section to be held, the clamps 59 and 59' acting to secure in a fixed position one of the two sections of rolls to b joined or separated, viz., roll ID in this instance. The roll clamp 59" for gripping the second roll section I2 is slidable along the rail structure 51 and when impelled therealong by pressure from the ram unit 55 will force either square [4 or l6 into or out of the square hole of the coupling l3 depending upon whether the roll sections are being coupled or separated. As illustrated, the clamp 59 is positioned between the abutment 58 and the stationary clamp 59 and movable along the rail structure 51 when pushed towards the clamp 59 or in the direction of the abutment 58 by the ram unit 55 when the latter is placed at either side of the fixed clamp 59 to force the roll sections l6 and I2 either together or spread them apart: by pressure reaction between the clamp 59" and either the abutment 59 or the fixed clamp 59.

The rail structure 51 comprises a pair ofpar allel support rods 6| and 62 for supporting the clamps 59, 59' and 59" and are disposed above and extend longitudinally of the roller beam 27 when the apparatus is in use.' The rods 6| and 62 are secured at one end in suitably spacedbores in the abutment member 58 and are held fixed therein by means of suitable pins 64 and 65 respectively. The abutment member 58 as thus arranged, forms a cross-tie connecting and supporting the parallel rods Bi and 62 of the rail structure 51 in spaced relation and, in addition,

serves as a pressure plate when engaged by one end of the ram unit 55'; p 7

As shown in Figs. 2 and 6, the clamp 59 is fixedly secured by pins 66 and 61 to the rods M and 62 respectively, the clamp 59 being affixed to the rods at a position therealong approximately five-ninths of their overall length as measured from the pressure plate or fixed abutment 58. For example,.in on press unit built and tested, the rods 6| and 62 were made approximately 36 inches long and the distance between the centers of stationary clamp 59 and the pressure plate 58 measured approximately-twenty-inchesq 59' and 59", these comp-rise individual clamp units arranged as above mentioned upon the rail structure 51,.the fixed clamp 59 being pinned to the rod 6| and 62 by pins 66 and 61, the second clamp 59 being. arranged to be adjustably positioned in desired adjusted positions on the rods 6! and 62 and there secured by a clamp screw 68 suitably arranged on this clamp, and thethird clamp 59 being'freely slidable on the rods 6| and 62 either towards or away from the fixed clamp 59 depending upon which side of the clamp 59 the the ram unit-55 is placed for. engaging and imparting the propelling force thereto to .push the clamp 59". Otherwise, the

three clamps are of similar construction so that the description of one. will suffice forthe others. As illustrated in Figs. 3 and 6, it will be seen that these clamps have agenerally rectangular blocklike base member 10 formed at'the lower portion of one end with a V-shaped roll-receiving opening H which forms the fixed or stationary jaw of th clamp. The opposite side faces of the block 70 proximate to the V-opening H are recessed inwardly as indicated at '12 to provide the fiat sided shoulders 73 and 14 which engage behind and in pressure-transmitting relation with the end of a roll boss of the particular roll sections being held-by the clamps during a roll.

assembling or disassembling operation, as indicated at a or at b in'Fig. 2. In effect, the stationary jaw presents a V-shaped opening. H bounded by a pair of vertically opposed plate-like projections formed by the recess 12 and the shoulders 13 and I4 and these projections are of narrower width than that of the end of the block in which they have been formed. The opposite side faces of the shoulders or projections 79 and 14 are flat and lie in parallel vertical planes. the projections 13 and M respectively defining the V-opening ll also are flat surfaces and make preferably 'a 45 angl with a horizontal plane bisecting the V-opening H, and thus bear a' right angular relationship to each other;

The top of the block 19 is provided with a reltively deep groove 15 which extends longitudinally of the block across its entire top face, as illustrated in Figs. 5 and 6. Mounted within this groove is the shank member 16 of the movable jaw 11 having at its outer end an enlarged depending L-shaped flange 18 the lengthof which is such that it will lie opposite the mouth of the V-shaped opening H of the fixed jaw in all extended or retracted positions of the'movable jaw 11 relative to the block 19. The shank 16 of the movable jaw 11 is confined within the groove 15 by means'of a plate 86 which is suitably secured to the top of the block 16, as by screws 8|, and positioned across the end of the groove 15 closest to the fiange 18 of the movable jaw.

To retract or to expand the movable jaw "IT with respect to the V-opening H there is provided a screw threaded rod 83 one end of which has threading engagement within a threaded opening 94 at the inner end of the shank 16 and secured therein by a pin 85 extending transversely of the rod 83 and the shank 16. The intermediate portion of the rod'83 is" positioned within the open section of the groove 15 while the forward end portion ofthe rod .93 passes through a suitable hole in a plate 86 terminating the forward end of the groove 15. and suitably secured to'theblock 16. The 'rod 83 has The opposing bottom and top faces of.

bearing" in theplate. 86' while the outer-screw threaded. end' portion of the rod extends for wardly' beyond the plate 86 for asubstantial distance and. carries thereon a hand wheel 88 carrying a hub. 89. which has threading engagement on the threaded outer-end portioni of: the rod-.83. A coiled spring Bil-mounted upon. the intermediate portion f theirod. 83' .and' extends ingsbetween the innerbendzof. the movable jaw 11' and. theinner end .faceLof-the. plate186- nor.- mally tendsv to urge: the 'movable jaw 11 out? wardly of thergroovef'IB and'.aWay-'from' the:-V- opening "'I I forming. the flxedrj aw to obtain. an opened position of: the I jaws as. depicted inv Fig. 3.=when.the.hand wheel 88 is manually turned inia direction to. unscrew it. Turning of the hand wheel 88. in. the. opposite. direction to thread it further'onto' thev rod 83 will retract the movable jaw 11 and pull it: towards. the V -opening II to drawtheroll neckiinto theV- opening'll and establish. clamping engagement with the roll neck, asdpicted in Fig. 6,. whereby the roll neck will be. engaged behind .one end of the fluted boss bythe-shouldersIS and M; of the fixed jaw and by thefltmge I8 of themovable jaw and the;roll neck will be tightly. held'in the V.-opening II byth'elflange IB during a rollassembling 01' disassembling. operation. When roll sections having fluted I bosses. of difierent diametersare to-be assembled vor disassembled, thenif theboss diameter is greater than that of the rods 6| and62 which supportthe clamps 59, 59 and 59 the rail structure '51 will pivot about rod 6| on the platforms lfl. of the bracketsZS and 26' as indicated in Fig; 6 and the jaw end of the blocks 10 also will lift due to blocks. 1010f. all clamps being drawnltoward the: rollneoks. of their respective roll members .upon'continuedturning of thehand wheel 88..and further :retractive movementof the movable jaw 'I 'I. after the flange I8 ofi.each clamphas engaged the respective roll necks. This action; follows since theroll-bosses proximate'to the clamps .rest'against' an. abutment member.92;fixed.to thetop of the platform Ml so that theentire rail structure; thepress, and therollfclampst59, 59" and159f will be" drawn bodilyttowards. the roll sections. after the: flange 18 engages thelroll .neck.. The roll. neck upon entering the 'V-opening II :and. in. being; seated. and: clamped against the projectionstisiand I4 causesrtheblock Ill.to:tilti-upwardly;v No tilting of the block 70. will occur. when the-fluted..bossisv ofithetsame diameter or. smaller than that of the rods 6| and 62, otherwise the samepulling action of .the clamps. towards'tthea-roll necktwill take'pla'ce.

The'hydraulic ram unit 55 of the: roll. assem+- bling and di'sassemblingapparatus comprises: a ram cylinder: lflllwhich formsrthe base' porti'on of'the ramunit, and a piston. OI'TDIUI'IgGI flUI axially extensible from one endof theicylinder I00. The ram cylinder IOU is adapted tonreceive fluidunderpressure from a flexible. fluid'transmitting :conduit I 02' coupled as .at': I03 to the :cylinder Illfl :of thelram unit andcommunicateswith the interiorrof theiram cylinder. The flexiblecond-uit I02 at itsiopposite end,tis coupled by ahydraulic: fitting IM'tothe outlet port ofialpumpzunit I051 The hydraulic ramiunit 55 'andthe. pump unit I05 may bev of .any, of the well' knownitypes of portablehyclraulic equipment commercially available .on the. market, thedetailed. construction-of whichforms nopartof the present invention. For. example, the. ranrunit and. then-pump: unit may be ofithe general utility-type:manufactured by? the: Blackhawk Mfg. 00., Milwaukee; Wisconsin.

The pump unit I05 comprisesra: pump cylinder or reservoir lut-containinglthe fiuid to beforced under pressure into the interior-of the ram 'cylinder, and a rocking beam Idl adapted to be rocked about pivot IO'B by meansof an actuating lever I09 to produce reciprocation of a pressure plunger (notshown): within. the. head end of the-pump unit thereby drawing fluid fromthe reservoir of the pump unit andtransmittingit'under pres sure'i'tothe fiexibleconduit I02 through thev'outlet t'port fitting I04. The pump unit'is provided at its :end portions with". suitable :foot' rest members H0 and .2 each": presenting an upwardly-e disposed roughened surface upon which the ope erator'canstanditomaintain the pump unit in fixed position on. thelrflOOI' during reciprocation of theoperating lever I09.

Theportable ram unit, as shown in Fig, 2,;is laid by the operator'between the guide rods6I and 62 of the railistructure 51 of. thepress.-.25 whenia roll. assembling operation. is to beperformed. When thusarranged. it will be apparent that upon reciprocation of theactuatinglever l09 of the pump unit I05, fluidmnderpressure will be: forcedthrough thefiexible conduitv I62 into. the ram cylinder. I00 thereby producing movement ofthepistonor. plunger IIlI axially outwardly of. the ranrcylinder-n Since. the: distal ends 'of:the fluted portions Ifixand I6 of'theroll sections I0 and I2. respectively; willbeengaged by the sidesof the clamps.:59,-59' and .59", which previously are clamped touthe roll sections,.this axialoutward movement: of. thelpiston. llll will be transmitted to thelmova-ble clamp 59." andtov the fixed transverse pressure plate 58;bythe respective ends of..the':piston10l.and the ramcylina der I after-engagementtherewith. This re.- sultsin the clamps 59" and-.59. having relative movement towards each-other when pressureis continued to be appliedito. the ram unit byfurther. operation of the-pump which results in shortening. the distance between theclamp devices, and forcing the shank. M of the :rollsection I 0 completely into: the square bore. of the tubular coupling sleeve I3 attached'to the other rollsection !2-whereby the outer cylindrical end portion 20. of .the cou-. pling I3 :willbe brought into: engagement with the outer end of the shortneek portion I1 ofthe rollsection I0.

It will be evident. from the 'aboveedescribed construction of the foregoing .textileroll assembling and disassemblingapparatus the unionor the separation of, the. numerous roll. sections which make up a lengthydrawing or feedroll thus becomes simple; thereby eliminating. the slow' and expensive hand .Work hitherto employed involving hammering operations to connect or driving-to-fit the parts together as has been previously required. Inithe' operation of the textile machine, rolls assembled-in thismanner and by theapparatus of the present invention run with accuracy and perfect alignment-throughouttheir entire length and there is no wobbling or unevenness in the rotation of thersections.

While there hasbeen shoWnherein-and described a preferred embodiment of. the'invention, it will be evident that the invention is not limited to the form herein shown nor to being applied to a spinning frame only which use was for illustrative purposes only, but it may be applicable in other'forms" and to other classes of textile machines such as roving frames" and drawing frames; the scope of theinvention b'eing defined in the claim appended hereto? I claim:

Apparatus for use in joining or for separatin connection in end-to-end relation with each other, and for use in association with a small portable hydraulic ram unit having a cylinder with a movable plunger therein operated hydraulically by a pump unit, said apparatus comprising a frame including a pair of spaced elongated rod members, a cross bar and a stationary roll-clamp ing device each fixedly mounted on and extending between said rod members rigidly connecting the rod members in spaced parallel side-by-side relation providing a unitary rail structure, an intermediate movable roll-clamping device slidably mounted on and between said rod members for longitudinal adjustment bodily therealong between said cross bar and said stationary rollclamping device, said stationary and movable roll-clamping devices each including in its structure cooperating fixed and movable jaw members adapted to clampingly grip the cylindrical neck part between adjoining fluted bosses of a textile drawing roll section to support a single roll section during joining or separation of the two roll sections, both of said clamping jaws of each clamping device being situated on the outside of,

the associated clamping device in extended relation beyond and at one and the same side of said rail structure and projecting therebeyond in a direction transversely of the path normally containing the axes of the respective roll sections to be joined or separated ,for supporting both roll sections in axially aligned relation and in an outboard position with respect to said rail structure, said movable roll-clamping device being propelled by a ram unit to be positioned between and in engagement with said movable rollclamping device and either said cross bar or said stationary roll-clamping device when a pump unit connected hydraulically with the ram unit is actuated to effect either union or separation of the roll sections carried by the respective rollclamping devices.

ROBERT R. ELLIOTT, SR.

References Cited in the'file of this patent UNITED STATES PATENTS Number Name Date 1,398,269 Nelson- Nov. 29, 1921 1,410,866 Young Mar. 28, 1922 1,597,875 Ferrier Aug. 31, 1926 1,707,870 Morton Apr. 2, 1929 1,828,758 Zimmerman Oct. 27, 1931 1,907,961 Guillet May 9, 1933 1,989,642 King Jan. 29, 1935 2,158,433 Schultz May 16, 1939 2,161,013- Breza June 6,1939 2,165,285 Mandl July 11, 1939 2,183,842 Mandl Dec. 29, 1939 2,194,981 La Marsh Mar. 26, 1940 2,195,256 Palmer 1 Mar. 26, 1940 2,244,989 Geddings June 10, 1941 2,467,332 Monteith Apr. 12, 1949 2,505,108 Geddings Apr. 25, 1950 2,549,820 Kinzle Apr. 24, '195-1

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