US2483611A - Car door and lock therefor - Google Patents

Description

w. A. BEAUCHAMP E-r AL 2,483,611

CAR DOOR AND LOCK THEREFOR Oct. 4, 1949.

3 Shee'ts-Sheet 1 Original Filed Sept. 1B, 1941 Oct. 4, 1949.

W. A. BEAUCHAMP ET Al. 2,483,611 l CAR DooR AND Loox THEREFOR l 5 sheets-sheet 2 Original Filed Sept. 18, 1941 47 Jg G4 4 "o 44 i 24 5/ .is

THOR VHL D /VHDL HND w. A. BEAUCHAMP ETAL 2,483,611

Det. 4, 1949.

CAR'DOOR AND LOCK THEREFOR 3 Sheets-Sheet 5 v original Filedsept. 18, 1941 "f//V VEN TOE5- Q l MQ MD 5D EL mw MT Patented Oct. 4, 1949 CAR DOOR AND LOCK THEREFOR Wilfred A. Beauchamp and Thorvald Madland, Chicago, Ill., assignors to The Youngstown Steel Door Company, Cleveland, Ohio, a corporation of Ohio Original application September 18, 1941, Serial No. 411,356, now Patent No. 2,387,109, dated October 16, 1945. Divided and this application June 30, 1945, Serial No. 602,557

17 Claims. (Cl. 292--283) This invention relates to car doors and to locks for said doors.

The urgent need for freight car capacity in the present emergency is recognized. To meet this need the railroads have let orders for a large number oi cars. The ability of the railroads to meet the great demand for freight car capacity is materially aided also by the production of house cars of ever increasing width.

There are, however, certain prescribed limitations upon the width of railway house cars. This width is determined by a tunnel clearance diagram established by the Association of American Railroads. The overall Width of these cars cannot exceed the maximum width indicated by this diagram.

It is the usual practice to secure various door xtures for railway house cars upon the outside of the doors of the cars. These xtures, such as door locks, opening and closing mechanisms, and the like, project measurable distances beyond the cars and to the extent of their projection limit the effective inside width and consequently the capacity of the cars. Conversely a reduction in the extent of projection of these iixtures permits an increase in theinside width and hence in the capacity of the cars.

It is the main object of this invention to provide door locks for sliding doors of railway house cars so constructed and arranged that a, reduction in the projection of the locks beyond the cars and an increase in the inside width of such cars are obtained without the necessity of altering the car construction.

A further object is to provide locks for sliding doors of railway house cars capable of imparting opening and closing movements to the doors and limiting their outward projection to the outermost plane of the doors.

A further object is to provide locks for sliding doors of railway house cars embodying levers carrying locking elements to which the levers impart movement for opening and closing the doors wherein all elements of the locks are so constructed and disposed as not to increase the overall width of the cars.

Other objects of the invention will become clear as the description thereof proceeds.

In the drawings forming part of this specication:

Fig. 1 isa partial elevation of a railway house car illustrating one embodiment of the instant invention.

Fig. 2 is a horizontal section taken on line 2-2 of Fig. 1.

Fig. 3 is a horizontal section taken on line 3-3 of Fig. 1.

Y Fig. 4 is a partial elevation of the embodiment of the invention shown in Fig. 1, the door being in partly open position.

Fig. 5 is a horizontal section taken on line 5-5 of Fig. 4.

Fig. 6 is a vertical section taken on line 6-6 of Fig. l.

Fig. 7 is a horizontal section taken on line I--I of Fig. 4.

Fig. 8 is a horizontal section similar to Fig. 2 showing the invention in relation to the doors of an automobile car, and

Fig. 9 is a horizontal section similar to Fig. 8 showing the doors in open position.

Referring to the drawings and more particularly to the embodiment of the invention illustrated in Figs. 1 to 7, inclusive, numeral It designates a side wall of a railway house car. A portion of this wall adjacent to the forward margin of a door opening II provided therein is shown.

As illustrated, the side wall ID includes a front door post I2 having a relatively long forwardly extending ange I3, an inwardly directed flange I4 and a short forwardly extending flange I5. Nailing blocks IS and I'I are fastened to the door post I2 as by means of bolts (not shown) and the inside of the wall is nished by means of wooden sheathing I8 secured to the nailing blocks. It will be understood that metallic sheathing is fastened to the flange I3 of the door post as is customary in metallic car construction.

A front door stop I9 is secured in any desired manner to the iiange I3 of the door post. The door stop I9 has an attaching flange 29, an outwardly extending flange ZI substantially aligned with the inwardly extending flange Ill of the door post, a forwardly directed flange 22 spaced from the attaching flange 20,`an outwardly directed ange 23 and a rearwardly and outwardly eX- tending flange 2d spaced from the' flange 22 and cooperating therewith and lwith the flange 23 to provide a pocket for the reception of the front vertical margin of a sliding door adapted to control the door opening II.

Locking means is provided for the door and is of such construction that without modification of the structure of the car an increase in the effective inside width thereof is obtained. The locking means illustrated embodies a lock bracket 25 secured as by means of riveting or the like to the car side I0 adjacent to the forward margin of the door opening. The lock bracket carries a .flange 26 which abuts the outwardly extending ner of the locking bracket a wall 32 is provided" spaced from the lock bracket bynrean'sof ther` horizontal and vertical walls, 33. and 3L. A

pocket 35 is thus formed witliirrwhich aile'verv' is pivoted upon pin 31.

The portion of the lever 36 lying above the pin 31 is formed with an outwardly extending cylindrical extension 38 which'is'extendediupwardly'15 in spaced relation to the lockzbra'cket 25ias indicated at 39. slightly as indicated at 40 and terminates in an inwardly directed cylindrical portion l 4lf which stops short of the lockibracket. The cylindrical formation of the. lever isutilized tocarryfalocking element 42. Engagement between ther/cylindrica-l' formation fof the lever and the-locking; element 42 is. obtained by'meansiofan-eye 43 formed in one end of the locking elementthrough which the cylindrical.I formationl of. thel levert extends. Engagement between the cylindrical formation of ther lever.y andthe locking: element is effected prior to the securement of the lever upon the lock bracketby means. of. the. pin 3,1 andlafter such securement it will be apparent that:y the inwardly extending cylindrical extension 4|` by reason; of. its. relationship w-itlrthe lock. bracket will prevent loss of the locking. elemer-i-t.`

The locking elementv 42;, illustrated l irl/.greater detail in Figs. 1. to 5J` inclusive,A includesk abody portion 44 which lies.- in. the outermost. plane .thereof and., defines the.4 limitof outward. projectionof theA lockingelement; Downwardly converging vertical. walls W1 and W2, extend. inwardly from. the. body portion-,Mito avv/al1` W3 to provide a housir-igor.y pocket P adapted .toreceive the locking. pin. 3 lwhich lies in. front. of the.v wall Ws. A reinforcingrib 45. extendsfrom thepocket I?. to the. adjacent'endof the locking element and locking lugslland 47- extend frometherside `of.the.reinforcingrib 45.V This rib together with the lockinglugs present in, ef't'ectasection substantially inthe formrof. a Tv in which the1rib may be consideredas. the sternof `the T and` the locking lu-gs as the flanges of the T. Thelockinglugs 452 and .74T are.. formed with projections or lobes 48 and ds'forthereason hereinaftendescribed. Thel portion ofthev lockingelement 4'2 which isreinforcedby the rib'fl is provided with flanges 5d? and'. 5| extendingv from either side of saidV portion` of".V the lockingelement for apur- .pose which willlhereinafter appear..

From a consideration of'Figs. 2 and 3` of' the drawings it will' appear that the outer face of the locking element 42" which lies the. greatest distance4 fromt'heside wall l0 does not project outwardly beyond'V the outermost. plane of', the sIidi-'ng door 52.' This door, which` is chosen ymerely to. illustrate theinventi'om embodies a metallic panel 53 providedwith a plurality of outwardly extending horizontal corrugations, one of which isshown at, 5Lv Adjacent its-fore ward edge the panel 53=is flanged Aoutwardly and forwardly as. indicated at. 55 andA terminates in a. vertical flange 56. lying. substantially in the plane of the crest of-.the horizontal corrugation 54. Thefront vertical margin. ofthe panel is reinforced' by; means of a stiiening'member 57i formed with alia-nge soverlying;V andfastened The upward` extension 35i/isf bent.

to the flange 56 of the door panel. The stiiening member 57 extends inwardly from the flange 58 in a web 59 and then forwardly in a flange 60 lying. substantially in the main plane. of the door panell 532. A backing plate: 'l is secured to the flange 60 and extends therefrom to the panel 53 to which it is fastened beyond the forwardly and outwardly flanged portion 55 of the panel..

FlangeF of an angular sealing strip S is rivetedtoflangeliof the panel stiffening member 5F17.; AAange-Fi extends outwardly from the forward end of'- the flange F and carries a rearwardly and outwardly directed ange F2. The sealing strip. S cooperates with the door stop i9 to weatherproof the front edge of the door.

To permitil'ockihg of the door 52 while limiting extension of the locking element 42 to the outer piane'of` the door the latter is provided with a locking detent 62. This detent, which is preferably' in the form of. a casting, is formed with a suitably reinforced attaching portionv 63 `secured tofthe'V crest.vr of the: horizontal. corrugation 524i as indicated' ait-'54 andto' the panel flange tfasein-f dicated at 65: The attaching portion is'flanged inward-lyas indicated'i at 66,1 the,- latterA ila/nge abuttingzf theimvard-lyy extend-ing flange' 5e of the'sbiffen-ing membert El; The Webf59l issapertured as indicated at' Stand aange 58y extending fromrthe-flangeA 5510i the locking, detent/.52pmjects through this-aperture.

The' ange Sf carries vertically spaced: outwardly extending; locking lugs? 691 an'd'llllfwhich aref-spaced: forwardlyv of the: flange 63. so. as to present in effect. a:V substantiallyv 'lf-shaped slot adapted for the reception of a portion oftthezree intorcing rib l5 of thelockingrelementM and-.the locking lugsy 461 and 4l. Locking: engagementv of theflockinglugs is thereby secured. The flange illrris lformedv adjacent to the. locking lugs- S3 and 10f with.' verticallyy spaced! recesses 'Il and 7X2 adapted: to receive the projections 48l and. 49 formed on-the-locking lugs; 46 and 4l;` thereby in'- creasingy the degree ofV locking relationship be.-

' tween.4 theflockingelement andl the: locking, de-

tent' and;` preventing unauthorized disengagement between these parts.

rEhe door` is-YillustratedI inf its closedandy locked position in- Figs.- 1 to,- 3, inclusive, of the. draw'- irrgsl.. Init-his position of therdoor al portion. of the reinforcing rib 45er thelocking element is disposed between. the locking.v lugs 89: and; i8 foi-med onY thedoor detent 62 and' between the flanges 21 and 28 formed on the: lock bracket 2-5-` To. permit thisvdispositi'on-fof the reinforcing rib-fthe outwardly extending. flange- 23 and the. rearwardly and outwardly extending ange 24 of.v thel front' doorstep arecoped as` indicated at 13. The ends of the frontstop lll formed by the cope are overlappedy and. reinforced, by theanges v2J' and28 of the lock bracket 25.V

Interlocking engagement between the locking lugs.- 46 and 41 provided: onthe locking element Bland-the locking lugs -5'9 and 'lll formed on the lockingr detent` S2 is thereby permitted and at the same time the desired-limitation. of the extension of the locking element to the. outer. plane of the door 52 is secured.,- An, increase. inl the effective-.inside width of the' car is accordingly obtained. v The flanges Eid-.anda 5l provided onthe locking element 42 overlap the portion of the*z front stop which is coped to prevent the entry or rain; dust and the .like-intoI the car..

The locking lugs are maintained in engage of the panel section 16.

ment by means of the pin 3l which-projects through the alined housings 29, 36 and P.

As hereinabove described the locking element 42 is carried by the cylindrical formation Provided on the lever 36. By reason of this construction the locking element 42 serves under the action of the lever to impart initial opening movement and iinal closing movement to the door 52. The position of the lever and the locking element when the door is partially open is illustrated in Figs. 4 and 5 of the drawings. The locking element is illustrated in Fig. 1 of the drawings in its unlocked position in dot and dash lines.

The instant invention has been described hereinabove in connection with a railway house car having a single door in each side of the car. The invention, however, is applicable as well to railway house cars having door openings of extraordinary width which are closed by two doors sliding in opposite directions. These doors are commonly referred to as main and auxiliary doors. One embodiment of the invention relating to double door construction is illustrated in Figs. 8 and 9.

The main door 14 of the double door construction is essentially the same as the door 52 of the single door construction and therefore no further description of the main door is necessary. The auxiliary door 15 embodies a metallic panel section 16 provided with a plurality of spaced horizontal corrugations, one of which is shown at 11. Adjacent to its forward edge the panel section 16 is anged outwardly and Aforwardly from the main plane thereof as indicated at 18. The forwardly and outwardly flanged portion of the panel terminates in a flange 19 lying substantially in the plane of the crest of the horizontal corrugations.

A panel section 86, preferably thicker than the panel section 16, is fastened to the latter and extends forwardly thereof. The panel section .89 embodies a flange 8| overlying and secured to the flange 19 as by means of rivets 82. A flange 83 extends inwardly and forwardly from the ange 8l and merges into a flange 84 lying substantially in the main plane of the panel section 16. The panel section 88 is flanged inwardly from the flange 8'4 as indicated at 85 and then forwardly to provide a relatively Wide flange 86 disposed inwardly of the main plane The flange 86 is in turn anged outwardly as indicated at 81 and terminates in a forwardly and outwardly extending flange 88 which is adapted to overlap the forward margin of the main door.

A metallic post 89 of substantially Z-shape in section is secured as by means of rivets to the relatively wide flange of the panel section 80. The outer ange 96 of the auxiliary door post 69 is flanged outwardly as shown at 9| and then rearwardly and outwardly as shown at 92.

The flange 92 cooperates with a portion of the flange 81 and the flange 88 to provide a pocket for the reception of the forward margin of the main door. The securement between the panel section 80 and the panel section 16 is reinforced by means of a backing plate 93 lying substantially in the main plane of the panel section 16. The backing plate 93 is fastened to the panel section 16 rearwardly of the outwardly and forwardly extending flange 18 and to the flange 84 of the panel section 80 thereby providing a sturdy tubular reinforcement for the auxiliary door.

Y6 y The lock bracket 25 hereinabove described is secured to the inwardly offset ange 86 of the panel section 86. The lock bracket 25 carries 'a pivoted lever 94 which differs somewhat in its shape from the lever 36. The lever 94 in turn carries the locking element 42 as heretofore described. The structure of the locking element 42 is the same as the similar locking element utilized with the single sliding door construction illustrated in Figs. 1 to "l, inclusive, of the drawings.

The main door 1-4 is provided with the locking detent 62 previously described which is associated in locking relationship with the locking element 42 as noted herein. This locking relationship is obtained in the instant embodiment of the invention by coping the iiange 81 and 88 of the panel section 86 as indicated at 95.

The main and auxiliary doors are shown in closed and locked position in Fig. 8 of the drawings. In Fig. 9 these doors are shown in their open position. With respect to the auxiliary door it will be apparent that the inwardly directed 11a-nge 85 of the panel section 86 abuts the outwardly extending flange 96 of an angle member 91 secured to the flange I3 of the door post I2 whereby the ilange 85 serves to limit the opening movement of the auxiliary door. The back stops normally used for this purpose are thereby eliminated. The ange 96 not only serves as an abutment for the auxiliary door but carries as well spark strip 98.

In the considered embodiment of the invention it will be apparent that the inset construction of the auxiliary doors provides for the attachment of the lock bracket, locking element and lever and for the disposition of the locking element when in locking position inwardly of a plane corresponding substantially to the outer plane of the main door. In this manner applicants invention is carried out in a double door construction for railway house cars as well as in a single door construction.

The instant application is a division of applicants co-pending application, Serial No. 411,356, filed September 18, 1941, which has issued as Patent No. 2,387,109, on October 16, 1945.

It will be apparent that numerous changes and modifications in the details of the invention will be clear to those skilled in the art. It is intended, therefore, that all such modifications and changes be comprehended within this invention which is to be limited only by the scope of the claims appended hereto.

We claim:

1. In a lock for sliding doors of railway house cars, a lock bracket, a lever swingably mounted on said lock bracket, a locking member swingably carried by said lever, said locking member having a reinforcing rib adjacent to the free end thereof, hook-shaped locking lugs projecting transversely of said locking member on opposite sides of said rib and means on said lock bracket cooperating with said locking member for securing the latter in locking position.

2. In a lock for sliding doors of railway house cars, a lock bracket, vertically spaced housing members on said lock bracket, a pin slidable in said housing members, a lever swingably mounted on said lock bracket, and a locking member swingably carried by said lever, said locking member having a portion adapted to lie between said housing members, said portion having an abutmnt adapted to engage a vertical edge of said p massacri 3.- Inrailock'for sliding doors ofy raiiway house cars', a .lock bracket; a lever swingably mounted onlsaid lockbracketa locking member swingably carri-'edby said lever', saidlocking member having 'alocking lug projecting transversely thereof, and

4.' In a lock' for sliding doors otlrailwa'yfhouse cars, al lock bracket, a lever swingably mounted on said lock bracket, a locking member. swingably carried by said lever, said lockingmember having a'hook-shaped locking lug 'proj ecting transversely thereof, and vmeans on said lock bracketlcooperatingwithv said locking member for securing' the latter in locking position.

5T. In a lock for sliding doorsof railway house cars, a lock bracket, a lever' swingablymounted on said lock bracket, a locking member swingably carried by said lever, said locking member having a' locking lug projecting transversely thereof, said locking lug having a lobe projecting transversely therefrom, and means on said lock bracket cooperating withV said locking member' for securing thelatter in locking position.

6. In a lock for sliding doors of railway house cars, a lock bracket,a lever swingably mounted on said lock bracket, a. supporting` member extending outwardly from the upper end of said lever,.,then upwardly and then rearwardly, a locking member having an eye through which said supporting member extends for swingably mounting said Vlocking member, the end of said rearwardlyextending portion of said supportingmember. lying in proximate relationship. to said lock bracket` to prevent disengagement of said locking member.

7'. In a railway house car having a relatively fixed member andi an outside slidingdoor the .Combination comprising a lock bracket secured to said'member in inwardly offset relationship to the outer plane of said door, a locking member. swingably supported'. on said lock bracket, saidzlocking member having a section of` substantially T-shapa: said l'shaped section embodying flanges constituting locking lugs, va de.- tent secured' to said door substantially within the outer plane thereof, saidV detent having a substantially T-shaped slot, lockingY lugs adjao cent to said slot, said' section of said locking member extending into. said slot and' said locking. lugs being engaged to locklsaid door, and-means for preventing disengagement of said klocking lugs', said locking member and said means being disposed substantially within the outer plane oi? said door. 8. In. a railway house car havingY a relatively rlxedl member andan outside sliding door, the combination comprising a lock bracket securedv to saidrelatively xed'member in4 inwardlyl offset relationship to the outer plane of said door a locking member swingably supported onsaid lock bracket, saidV locking memberv having a transf versely extending locking lug, adetent secured to said door substantially'within the outer plane thereof and havinga transversely extending locking' lugr said locking lugs being engaged. to lock said door, and means on saidlock bracket cooperating with said locking member for maintaining, said lugs in locking position,l said. locking` member and'said means lying substantially within' the outer plane of said, door when. in locking, position.

'9T In a railway house car having a relatively;

ilxed-A memberl and an outside sliding door, the combination comprising a lock. bracket secured to said relatively xedrmember in inwardly offset relationship to the outer plane: of said door,v a lever swingably carried by saidv lock bracket, a locking memberl swingably carried by said lever, allccking lug projecting transversely from said locking member; adetent secured to sai'di door substantially withinzthe: outer plane thereof havL ing' afi transversely extending locking lug, said lockinglugs-being engaged.: to lock saidl door, and means for` maintaining said locking member in locking position, said locking member and said means lying substantially within the outer plane ofsaid door when in locking position.

10. In aV railway house car having a relatively nxedr member and an outside sliding door', the combination comprising a lock bracket secured to said relatively fixed member inf inwardly offset relationship to the outer plane of said door, a lever swingably carried b'ysaidlock bracket, a locking member swingably carriedby said lever,a locking lug projecting transversely from said locking member, a lobe extending transversely fromv said locking lug, a detent secured to said doorfsubstan: tially within the outer` plane thereof" having a transversely Vextending'l'ocking lug, a r'e'cessl'in said detent, said locking lugs being engaged' tov lock saidf door, said'lobe extending into said'recess, and means for maintaining said locking member in locking position, said locking' memberand said means lying substantially within the outer' plane of said door when lin locking position.

1'1. In a railway house -car having a wallpr'ovided with a door opening, a front door stopadjacent to'said door opening and an outside sliding door, the combinationV comprising a lock bracket secured"v to said wall in inwardly oiset relationship to the outer planerof-y said door, a locking member swingably supported on 'said' lock bracket, said locking member having a transversely extending locking lug; a detent secured to said' door substantially within the outer plane of said door.' said detent havinga'transversely extending locking lug,l a portion of said front stop` being'removedto. provide a recess for receiving said lockingmember to permit engagement of said locking lugs, and means for releasably securing said lugs in locking engagement, said lockingvmember and said means lying substantially; within the outer plane of saidl door when in lockingv position.

12. In a railway house car having a wall provided with a door opening, a front'door stop adjacent to said door opening and an outside slidingdoor, the combinationcomprising a lock bracket secured to said wall infinwardlyfoiis'et relationship tothe outer plane of said' door, a locking mem-ber swingably supported on said lock bracket', said locking member having a transversely extending locking lug, a detent secured to said door substan-l tially within the outerplane'ofsaididoor, said detent having a transversely extending;lockinglug, a portion of said front stop-being removedltoprovidefa recessl for receiving said locking member to permit engagement' of said locking lug, and;

means for releasably securing said lugs .in locking engagement, said lockingl member and said: means lying substantially within theouter planeof. said door when in locking position, said locking meme ber having anges covering the portions of saidA front stop-adjacent to saidy recess.

13. Ina lock for sliding doors. of railway house' cars, a locking member, a pocket formed ingsaid:A locking member' adapted' toT receive afl'ocking.pintr saidpocket-lying inwardly oilthefouterface ofsaid'v member, a rib extending from said pocket to the free end of said locking member and locking lugs projecting transversely from the free end of said locking member on opposite sides of said rib, said lugs lying inwardly of the outer face of said member.

14. In a lock for sliding doors of railway house cars, a locking member, a pocket formed in said locking member adapted to receive a locking pin, said pocket lying inwardly of the outer face of said member, a rib extending from said pocket to the free end of said locking member, aligned flanges extending in opposite directions outwardly from said locking member, said flanges extending substantially from said pocket to the free end of said locking member, and locking lugs projecting transversely from the free end of said locking member on opposite sides of said rib, said lugs lying inwardly of the outer face of said member.

15. In a lock for sliding doors of railway cars, a locking member, said locking member having a body portion lying substantially within the outer plane of the door, an eye formed in said member inwardly of said plane adapted to mount said member for horizontal and Vertical swinging movement, a pocket formed in said member adapted to receive a locking pin, said pocket lying inwardly of said plane and embodying an inner wall adapted to lie behind the locking pin and downwardly converging side walls extending from said body portion to said inner wall, and a locking lug on said member adjacent to the free end thereof, said locking lug extending inwardly from said body portion of said locking member.

16. In a lock for sliding doors of railway cars, a locking member, said locking member having a body portion lying substantially within the outer plane of the door, an eye formed in said member inwardly of said plane adapted to mount said member for horizontal and vertical swinging movement, a pocket formed in said member adapted to receive a looking pin, said pocket lying CFI inwardly of said plane and embodying an inner wall adapted to lie behind the locking pin and downwardly converging side walls extending from said body portion to said inner wall, and a hookshaped locking lug on said member adjacent to the free end thereof, said locking lug extending inwardly from said body portion of said locking member.

17. In a lock for sliding doors of railway cars, a locking member, said locking member having a body portion lying substantially within the outer plane of the door, an eye formed in said member inwardly of said plane adapted to mount said member for horizontal and vertical swinging movement, a pocket formed in said member adapted to receive a locking pin, said pocket lying inwardly of said plane and embodying an inner wall adapted to lie behind the locking pin and downwardly converging side walls extending from said body portion to said inner wall, a looking lug on said member adjacent to the free end thereof, said locking lug extending inwardly from said body portion of said locking member, and a lobe projecting inwardly from said locking lug.

WILFRED A. BEAUCHAMP.y THORVALD MADLAND.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,571,158 Posson Jan. 26, 1926 1,946,714 Shafer Feb. 13, 1934 1,957,642 Hansen May 8, 1934 2,055,565 Vegren Sept. 29, 1936 2,158,336 Madland May 16, 1939 2,195,620 Ditoheld Apr. 2, 1940 2,284,099 Madland et al May 26, 1942 2,318,146 Erhardt May 4, 1943

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