Oct. l., 1946. / R. A. MILLER -ETAL FOLDING DOOR Filed July l5, 1944 i. / 35é n=0n=u 2/6 4Wi l 2,408,525 ' 6 Sheets-Sheet l Oct; l, 1946.» I R. A. MILLER ET AL - ¿408,525 AFOLDING DOOR Boagëï 12 Afl/_LER á‘( (2n/2201. l. ?/o wann @M I Oct. 1, 194,6. R. A'. MILLER ET AL 2,408,525 FOLDING DOOR Filed July 13,- 1944 «Il » wìOS , 6 Sheets-Sheet> 5 O _ Qct. l, 1946. R. A. MILLER ET AL 2,408,525 FOLDING DOOR Fiieq July 13, 1944 e 'sheets-sheet 4 Oct.y 1, 1946. R. A. MILLER ET AL v _ 2,408,525 tFOLDING DOOR Filed'July 13, 1944 ' l /z 6 Sheets-Sheet 5 _ "òáfi "1946. " 2,408,525 Rf A. MILLER ET AL ' FOLDING DOOR Filed July is, 1944 __m _ __ _k L“ _ \\ _ www@vwnw@___._ _ ë_ _l |I/\l.)„ e sheets-sheet 6 _ _ ____ _, _ m ___ _ _Qä. __ @0 \ v_ LMW\.D 3mm l : I c / m w N . í „w ¿Siwa @ma _Eo_l E_ _n ß#,w w Patented Oct. 1, 1946 2,408,525 ' UNITED STATES PATENT OFFICE FOLDING DÚOR Robert A. Miller, Tarentum, and Carroll Howard, ~ Rochester',~ Pa., assignors4 to Pittsburgh >Plate Glass Company, a. corporation of Pennsylvania Application July 13, 1944-, Serial No; 544,800 12 Claims.. (Cl. 160--36)l . 1 Thisl invention relates to» fold-ing- door struc-~ tu~re~ and it has particular relation to folding door units adapted to carry platel glass as the principal body portion of each door unit. . 2 Y therefor; Fig. 2 is- a combined diagrammatic plan andy horizon-ta1 section of compartment structure and door units in folded relation; Fig. 3 is a frag mentary diagrammatic horizontal section of fold One object of the invention is to provide a fold» Oi ing door structure taken substantial-ly along ther ing door structure capable of serving as a barrier lin-e III-_III of Fig.. 1;v Fig. 4 is a horizontal sec-~ across a relatively large space and adapted to» be tion, on a larger scale, also taken substantially transferred as a unit to a storage compartment ` along thev line III-LII of Fig. l=,.but with portions when not iny use. of the structure` omitted;V Fig.I 5 is. 2,. confiloinedv Another object of: the invention, is to-provide _ fragmentary side elevation. and vertical section an improved fold-ing door structure adapted to illustrating in detail an end portion of the. door lse installed in conjunction> with- particular struc~~ structure; Fig.. 6 is a fragmentary side elevation. ture of deck houses and otherk superstructureV of: combined with a vertical section of acentralpor ships. ' tion ofthe folding door structure and including. Another object of the invention is'> tof provide a trolley assembly, all on a larger scale; Fig... 7 is an improved door structure and- hinged; connec-y tions between a~ seri-esì of foldingÍ door: units and a bottom plan` of. a. portion.. of a lower door hinge and. roller arrangen'ient;l Fig. 8 is` o, fragmentary vertical section, on a. _l'argerscale taken substan tially along thev line VIII-VIII of Fig. 1.; Fig. 9 supports for movably carrying and shifting; the position of the entire door structure. I-n onel form of the invention a series of glass ~ _ is. a cross-.section of a channel guide and cover mounted in a floor or deck; Fig.v 10. is a fragmen doorV units are- supported upon overhead» tracks by means of spaced trolleys'. Certain of thedoor units are connectedtogether- adiaeent-their edges in! hinged relation: remote from» the location` of the trolleys and: others are- connected directly tary side elevation. of trolleyy and door structure together with aÍ vertical section of a. portion of. a lower channel- guide; Fig. l1 isa fragmentary side elevation- of adjacent. door units. together with hinging connections. therefor; Fig.4 12 is a bottom.. plan. of vthe central portion of the struc ture shown in Fig.. 11; Fis’.` I3 is a fragmentary below the trolleys. In this arrangement the doors are hinged: either to. trolley extensions or torin termediate posts so arranged that each door can he swung bod-ily» outwardly fromêthe vertical plane of» the overl'iead,` trolleys.i The severaiV doorI units thus connected can be moved as a unit onto an ' auxiliary support which i-s-v itself hinged so that turesare independently hinged upon. part. of the movable. structure. to provide.. swinging. double doors for passage- from` onev side. to thel other. of the structure.. i 1 y Y ~ When this type of structure isapplied to. a sloping deck the door hinges are so arranged that the. door whenffolded, swing. ont` over the downwardly sloping portion of the deck which will oii‘er no.interference;totheoperation of the doors. lin. the drawingsz. ‘ Fig.. 1` is a. fragmentary diagrammatic side¢ ele- 1 vation; of folding. door structures and supports ~ . In practicing theV invention a pair of. folding door structures 20 and> 2L are carried between overhead superstructure. 2d and. a door or deck are guided by meansof- rollerstravelling between track members formed by upper' andflower. rails. In order to traverse a relatively large space be tween deck house walls of a shipor’loetween» other or similar walls, two folding. door structures are employed., each Vto be operated asy a- unit. and ex vertical sectiony taken' substantially along. the line XIV-XIV. of Fig. 1.. the structure can be shifted into' a compartment. 'I’he upper and lower portions ot the structure tended from. opposite- directions soA as to meet at. acer-_trai location between the deck houses. The inne-r or adjacent. units of each` of. these struc vertical lsection.taken.substantially along the line XIII-XIII of Fig. l.; andFig. 1dx isafragmentary 24-Í of a ship. The surface. of the latter in certain instances may slope es. indicated in Figs. 1_3. and 14. In this particular description the folding 40 door structures are. applied to a deck ofia ship. A« relatively long metal guide. 25 of channel form opening upwardly is rig-idly anchored in thel deck by mea-ns of fasteners 26. (Fig. 9) inf such man ner that itl is. disposed slightly below the deck surface. A- cover railI or strip 29., having. a. hinge connection.Y Si). along one edge by which it is con. nected to an. adjacent edge of. the channel guide, coversthe latter or leavesit open depending upon thicker the. position portici-for ot the. ribfolding 3|- projecting.` door structures’. from one. side of’ the taillis» adapted toi’it-intoethe channel guide so’ that the' rail may- lie substantially ñushl with the surface of the deck. as' indicated. in: Fig. 9. The ship superstructure includes. deck houses 2d between which theê folding door structures Opera-lief.. Each; of. the structures- includes a. series 2,408,525 3 of door units 35, 33, 31, 38, and 33. Each of these units >includes upper and lower metal channel frame members 40 and 4| for receiving upper and lower marginal portions of door panels 42 which can be in the form of relatively heavy tempered glass plates transparent or semi-transparent, or opaque. 4 |00 formed on the shaft. This roller is disposed in the channel guide 25 and cooperates with the rollers 10 in maintaining the door unit in proper The upper channel frames 4t include upwardly-extending flanges 45 and downwardly extending flanges 45 which define oppositely fac ing double channel structure. Likewise, the bot, tom channel frames 4| include upwardly and downwardly-extending flanges 48 and 43. An overhead track 50 carried by the ship super structure by means of suitable hangers 5| sup ports the folding door structures in suspended relation by means of trolleys 52, 53, and 54, which travel upon inwardly turned and spaced flanges movable relation along the track. , The second trolley 53 (Figs. 1 and 6) is located immediately above the junction of the door units 35 and 31, >the latter of which arespaced along their adjacent edges. A vertical post |02 is dis posed between these adjacent edges. This post which is somewhat similar to the post 80 is bolted rigidly as indicated at |03 to the lower mid por tion of the yoke plate 18 of the second or central trolley 53 and is thus suspended from the latter. Upper stud shafts |04 having lower heads |05 are rigidly mounted by screw-threading or other wise in spaced relation in the plate 'i8 of the second or central trolley 53, and they have bearing relation respectively with blocks |05, the latter 5E of the track. Since the trolleys are all sub of which are rigidly secured by means of screws stantially the same in structure only one of them |00 in the frame members 40 between the flanges 20 will be described in detail. 45. These blocks are located at the upper inner Each trolley includes a substantially horizontal corners of the door units 35 and 31 and the con frame 60 having transverse horizontal axles 6| struction for mounting them corresponds sub extending therethrough to support ,rotatably two stantially to that described above in connection pairs of wheels 52 which- roll upon the track with the hinging of the door unit 35. 25 flanges 55. End portions of the frame between A lower bar ||0 is also rigidly fastened to the the wheels of the respective pairs extend down post by means of a screw ||2 which is vertically wardly to form bosses B4 having vertically tapped threaded into the lower end of the post. This openings 55 in which vertical stud shafts 61 are bar extends horizontally beyond opposite sides screw-threaded to receive sleeve-like rollers 10 of the post and underlies the plate 18 for the that are held in place by means of heads 1| on purpose of receiving vertical stud shafts | I4 which the lower ends of the shafts 51. A set-screw 12 extend rotatably into blocks ||5, set between the which is screw-threaded into each boss 64 bears lower flanges 49 of the channel frames 4| of the against the threaded stud shaft to prevent acci door units 36 and 31. These blocks are held in dental displacement thereof. These rollers 10 fit place rigidly by means of screws H5 passing between opposed edges of the track flanges 53 through the flanges 4S. The stud shafts l |4 have (Fig. 8), to assist in guiding the trolley linearly upon the tracks and to prevent the trolley from intermediate screw-threaded 'portions rigidly turning about a vertical axis. the bar ||0 and are provided with integral lower Y mounted in oppositely extending end portions of A yoke 14, having an upwardly bowed bearing heads ||9 which support rollers |26 in the same portion 15, extends freely between edges of the 40 manner as the stud shaft 92 supports the ’roller track iianges and is suspended from the central 98 and for the same purpose of guiding the door portion of each trolley frame upon a bolt 15 ex structure in the lower channel guide 25. tending therethrough. The lower portion of the From this description it will be apparent that yoke includes an integral horizontal plate 18. l a' the yoke plate 18, post |02 and bar ||0 consti The inner or first trolley 52 directly suspending the door unit 35 has its yoke 14 connected to an upright post 80 (Fig. 5) in which a plug 8| is Welded for the purpose of carrying an upright bolt 82 rigidly secured thereon and which rigidly secures the yoke 14 to the post 80. An upper stud shaft 04 having a lower head 85 is rigidly mounted by screw-threading or otherwise in the yoke _plate 18 of the end trolley 52, and has a bearing mounting in a block 85, the latter being rigidly secured by means of screws 09 in the frame member 45 between its flanges 45. This block is located at the upper inner corner of the door unit 35. The lower portion of the post 80 has a metal bar 90 rigidly mounted thereon by means of suit able fasteners 9| and projects horizontally below and parallel to the plate 18. A stud shaft 02 of screw form is threaded through the bar 90 in axial vertical alignment with the upper stud shaft 84 and has an upper unthreaded bearing portion 94 which rotatably receives a lowerv block 95 mounted rigidly by means of screws 95between the downwardly-extending flanges 40 of the lower channel member 4|. The door unit 35 is thus hinged'adiacent its rear edge upon the stud shafts 84 and 02 for pivotal movement relative to the post 80 and about a vertical axis. ' ` The lower end of the stud shaft 32 has a roller 08 mounted thereon and is maintained against displacement therefrom by means of a lower head. tute a unitary support for the adjacent door units and all of these are suspended primarily from the trolley 53. Linear spacing of the upper rollers 10 and like spacing of the lower rollers |20 is such thatthis unitary support is maintained in predetermined relationship and held against turning about a vertical axis while carrying the hinge connections |04 and ||4 for pivotal action of the door units 35 and 31 about vertical axes adjacent their opposing edges. The third or inner end trolley 54 (Fig. l0) is constructed in substantially the same manner as those previously described with the exception that one horizontal endl portion of the yoke plate 13 is omitted, Therefore, reference characters em ployed in defining corresponding elements of the trolleys 52 and 53 are applied in the same man ner to the trolley 54. In this, arrangement an upright support |30 for the opposed marginal - portions of the door units 38 and 39 is sectional and includes upright post sections |3| and |32 which are joined by a so-called piano hinge |34 along one side of the post for pivotal action about a vertical axis. The hinge |34 is secured to the sections |3| and |32 by means of bolts |33 pass ing therethrough. The yoke plate 18 of the trolley 54 is provided with an integral downwardly-extending arm |35 which is rigidly mounted in the upper end of the post section |3| by means of fasteners |36, such 2,408,525 45 6 as bolts orl screws. `The upwardly-extending are adapted to swing outwardly when >the'door units are folded and that the "vertical hinging flanges 45 of the door unit 38 receives between them a lblock v|30 in which a vertical stud shaft n axes are adjacent their marginal portions. That |40 is mounted. The block |38 is anchored by means of screws |4| passing through the block and fianges. The upper end of the studfshaft is is, substantially the entire body of each door unit is swingable away from the vertical> plane of the . track 50. - threaded into the yoke plate 18 and the lower end 4In maintaining the door units in extended po- v thereof is provided with 'a head |42 to prevent sition as shown in Figures l and 3 the units of displacement of the block therefrom, each door structure are held in aligned relation A lower'bar |45 at the lower portion of the door 10 along their upper portions by means of a rail unit is formed with an angular portion |40 rigidly |94 (Fig. 8) which is hinged, as indicated at |95, ' mounted in the postsection ' to the overhead track structure and by means of screws |40. A stud- shaft |50 has an intermediate bolts |06 which extend Vthrough these rails and portion screw-.threaded into the bar |45 in are screwethreaded into openings |93 (Fig. 11) vertical and axial alignment with the stud shaft in the swingable posts |80 and ISI. A resilient |40, and its upper end extends in bearing rela tube 20.0 of rubber, or the like, is mounted,V as tion into a block |5| .that is rigidly mounted be* indicated at 20|, upon a ñange 202 of the rail tween the lower flanges 40 Vof the door frame by and is pressed against the upper marginal por means of screws |52 passing through the block and ñanges. These stud shafts |40 and |50 con 20 stitute hinging> members for the door unit 3’8. An upper plate |54 is formed with an angular tions of the doorY units in response to the fasten ing of the bolts |96.V After the door units have been folded the rail |94 can be swung upwardly «until a spring 204 mounted thereon snaps over the edge of -one'of the track ñanges 50. This arm .|156 that is rigidly mounted by means of screws |58 in the upper post section |32 and re spring'is’secured` as indicated at 205, upon the outer portion of the rail and is sufficiently strong to hold the rail releasably in the position indi ceives a stud shaft |60 vertically screw-threaded therein. . The lower portion of this shaft has a bearing connection in a block |6| that is mounted rigidly between the upper flanges 45 of the door cated. - ~ Likewise, when the door units are extended, unit 39 by means of screws |52- passing through the iianges and block. A lower head portion |54 bolts 206 canbe'secured through the flange or thicker portion 3| of the hinged cover rail 20 and threaded into the lower portions _of the posts i811 and |8| to vanchor the lower portions of the 4door structure to the deck.' In order to fold the on this stud shaft prevents the latter from being f displaced from the block. A lower portion of the door unit 30 is provided with a block |65 rigidly mounted between the lower ñanges 49 thereof by means ofV screws |61 door units, the bolts |96Í and y206 are removed and the rails 29 and |04 are swung to one side. After theV door units'ha've been folded the rail rigidly a vertical stud shaft |10 which can be 28 can be closed' o-ver the channel guide 25Y sub more firmly .anchored by means of a set-screw stantially ilush with the surface of the deck as |1-| also passing through one of the flanges 49. , The lower end of the shaft |10 extends down 40 `indicated in Fig. 9. If desired, the rail 29 can be secured in its flush relation to the deck sur wardly into a horizontal -casing |12 which con face by means of suitable demountable fasteners tains conventional spring controlled hinging 201, such as screws, which can be applied as mechanism. Gusset plate structure |14 forms a shown in Fig. 9. ` . ‘ ì connection between the casing and post section InV order to provide a sealing connection be |32 and is rigidly secured thereto by means of tween `the lvertical edges of the door units and screws |15. The shafts |60 and |10 are vertical passing through the block yand ñanges to receive the several upright posts and supports (Fig. 4), channel >members 2li) of plastic:y rubber, or the and axially aligned and the door unit 39y is swing able thereabout while` the post sections |3|-|32 remain stationary. In order to maintain these like, are mounted in grooves 2|2 formed in. these members and `the channel membersA are held in post sccsons in ri idly assembled relation whenv .Y place by means of Screws ¿M_ The Outer edges n ?. l . „_T. _ . í. l ì the door structin‘e is in its extended position, of the channel members i’it closely against the edges of the door units in sealing relation. ’It bolts |15` (Fig. 4) are mounted therein to secure them rigidly together, while also maintaining the casing 422 in parallel .alignment with the lower channel guide 25 immediately above the latter, » f Bodily swingable posts |80 and |8| are disposed between the trollcys~52 and 53 and between the - will he observed that the edges of the door units are `round-ed kso as to have vertical edges all points o_f which are equidistant from the vertical axes of the adjacent door hinges. Thus the yieldable >trolleys 53 and 54 respectively. Since the posts channel 242 members fit uniformly against the |80 and |8| are the same in structure and con.V nections to the pairs of door units 35-36 and 31-38, respectively, the same »description of their mountings sufûces for both. Upper and lower edges of the door units. bars |il2'bolted., as indicated at |84, transverselyy upon upper and lower portions of each of the posts I8@ and |8| receive pairs of upper and lower lstud shafts |85 and |85 that constitute ' ' y In connection with the folding of the door units, inciuding the hinging movement of the central or entrance unit 319y about the piano hinge | 34, these units can be folded and ‘moved to the position indicated in full lines in Fig. 2.> Each deck house . 34 includes a compartment 2|5 into which the tracks and channel guides extend. A door 2i 6 hinges for ti'ie edge portions of the adjacent door of the compartment has a vertical hinge 2| 9 sup units S51-Stand the adjacent door units 31-30. ported» upon the ship superstructure and can be Upper and lower pairs of blocks |90 and |8| are mounted rigidly between upper and lower ñanges 45 and 49, respectively, by means of screws |02 swungt to theY position indicated in broken lines. An upper auxiliary track section 220. forms in' tov form bearing members for receiving the. stud eii’ect a continuation of the primary overhead track 50, and a lower channel guide section 22| shafts |85 and |85- in .the articulated connections is likewise a continuation of the channel guide » between the door units and posts. 25. rI'he guide section 22|> (Fig. 13') is rigidly It willbe observed that the vposts |00 and |8| 75 mounted upon a channel .arm 223 by welding, 2,408,525 8 right position, hinges connecting adjacent doors or the‘like; as indicated at 224. Both of these sections 22S and 22| are rigidly secured to an upright support 225 by means of upper and lower and carrying them for folding movements on vertical axes, one of said doors having an ad ditional pivotal _support movable with the door gusset plates 226 and 221. structure along the track means and supporting said door for opening and closing action inde As shown in Fig. 14, the upper end of the post 225 has a plug 235 welded therein. as indicated at 23|, and has an upright integral shaft section pendently of said hinges. 232 upon which race rings 234 are mounted to 2. In a folding door structure, a series of door and anchoring the outer race ring against a, shoulder 245 of the sleeve. Horizontal flanges 246 on the sleeve receive vertical bolts 241 which are adjustably mounted by means of pairs of nuts 249 and 25|! secured upon structural members 25| carried |by the ship superstructure and on the series of units thereon, an upright support car rying said track section pivotally on a vertical flanges 246, respectively. It will be observed that the race-way 252 of the bearing structure cluding upright supporting means carried by units having means connecting adjacent units receive roller bearings 235. The inner portion of in articulated foldable relation on substantially 10 the race ring structure is held in place by means vertical axes, each unit including a glass panel, of a nut 236 on an upper shouldered end portion track means for guiding the units in movements of the shaft section. ' from a position of extended aligned relation to a A sleeve 245 surrounds the bearing elements, position of folded relation, a track section align the outer portion of which is firmly secured there able with said track means for receiving the on by means of a cap 24| threaded into the sleeve 15 axis forI swinging the track section with the folded units thereon away from its aligned rela tion with said track means. 3. In a door structure, a door supporting frame work, master track means, said framework in said track means for travel thereon, auxiliary track means alignable in juxtaposition with the ment of support 225 while the bearings carry the 25 master track means for receiving the door sup load of the support in thrust relation. porting framework from the master track means, The lower portion of the support 225 has a supporting means carrying the auxiliary track plug 26!! rigidly mounted therein by means of means on a vertical axis toswing said auxiliary welding, as indicated at 26|. This plug has an track means with the framework thereon to and axial recess 262 for receiving a roller bearing 30 Áfrom a position of alignment with said master structure 254 that is vertically and axially aligned track means. with the upper bearings 234-235. A vertical 4. In a door structure, a door supporting shaft section 265 is rigidly mounted in a bracket framework, master track means, said framework 251 that is bolted as indicated at 268 to the ship including upright supporting means carried by deck. The bearing structure 254 is mounted 35 said track means for travel thereon, a door is curved so as to provide for slight angular move upon this shaft section in such manner that the support 225 is held in a substantially vertical hinged upon the supporting means, means for re position and is prevented from moving laterally; work on said track means, a compartment dis such support is suspended from the upper bear ings 234-235. _ I leasably anchoring the door supporting frame 40 posed adjacent said track means and receiving one extremity thereof whereby the supporting After each door structure has been folded and framework with the door thereon is movable as moved to a position adjacent its deck-house the a unit upon the track means into the compart door 216 is opened and the folded group of units ment. is rolled on the trolleys from-the main track 5|) 5. In a door structure, a door supporting frame to the track section 220 aligned therewith. The 45 work including upright supporting means, a door rollers at the lower portion of the door units pass hinged upon the supporting means on a vertical to the channel guide section 22|, which is like axis, a compartment for confining the door sup wise aligned with the channel guide 25. This porting framework therein, a master track means action results in a complete transfer of the door extending to the compartment, means for riding structures to the support 225 which is then swung 50 the framework on said master track means to about a vertical axis in a counterclockwise direc the compartment, auxiliary track means in said tion (Fig. 2) to a position inside the compart compartment alignable in juxtaposition with the ment 2 | 5. Then the door 216 can be closed until master track means to receive said framework the folding door structure is again to be extended 55 with the door thereon, and means for supporting and placed in operative position between the deck houses in the position shown in Figs. 1 and 3. In performing this operation the support 225 is swung in a clockwise direction until the track section 220 and guide section 22| are aligned with the track 5B and guide channel 25, respec tively. ‘I‘he door units can then be extended and fastened in place in the manner indicated above and as shown in Figs. 1 and 3. Although only one form of the invention has lbeen shown and described in detail, it will be apparent to those skilled in the art that the in vention is not so limited. but that various changes can be made therein within the spirit of the in vention and within the scope of the appended claims. We claim: 1. A folding door structure comprising a plu rality of upright doors, track means having con nections with the doors for guiding them hori zontally while maintaining said doors in an up said auxiliary track means on a vertical axis for swinging the door supporting framework away from the master track means into the compart ment. 6. In a door structure for traversing an area of floor, a door supporting framework, primary overhead track means, said framework including upright supporting means carried by said track means for travel thereon, auxiliary track means 5 alignable in juxtaposition with the primary track means for receiving the door supporting frame work from the primary track means, supporting means carrying the auxiliary track means on a vertical axis to swing said auxiliary track means with the framework thereon away from a position of alignment with said primary track means, a channel guide member parallel to the primary track means for guiding the lower ex tremity of the framework along the floor, a 75 cover plate movable on the channel guide to a 2,408,525 position substantially flush with the surface of ulated relation on substantially vertical axes, the floor when the supporting framevis on the auxiliary track means and having means thereon engageable with said framework to anchor the latter in a predetermined position. track means for supporting the doors in move ments from a position of extended relation to a position of folded relation, said track means hav ing an extension beyond .the normal operative position of ‘the folding door structure and the ' 7. In a folding door structure, a series of »door units, upright supporting means disposed between adjacent door units and carrying the latter pivot ally on vertical axes, said upright means includ ing sealing members engaging the edges of the door units in yieldable relation when the door units are disposed in aligned relation, track means for supporting the door units in move ments from a position of extended relation to a position of folded relation, said track vmeans extending ybeyond the normal operative position of the folding door structure and the latter being movable as a folded assembly upon said extension beyond its normal operative position. 8. In a folding door structure, a series of doors having means connecting adjacent doors in artic latter being movable as a folded assembly upon said extension beyond its normal operative posi tion, a cover- rail hinged lengthwise along the l0 side of the track means and swingable into cov ering relation thereto after the doors have been folded, and means for releasably holding the cover rail in covering relation to said ltrack means, said cover rail also being swingable to one side of the 15 track means, and means demountably engageable with the cover rail and with .the series of doors to hold the latter rigidly in extended relation. 11. In a folding door structure, a series of doors having means connecting adjacent doors in artic 20 ulated relation on substantially vertical axes, upper and lower track means for guiding upper yand lower extremities of the doors in movements ulated relation on substantially Vertical axes, track means for supporting the doors in move . from a position of extended relation to a position ments from a position of extended relation to a of folded relation, said track means having ex position of folded relation, said track means hav 25 tensions beyond the normal operative position of ing an extension beyond lthe normal operative the folding door structure and the latter being position of the folding door structure and the movable as a folded assembly upon said exten latter being movable as a folded assembly upon sions beyond its normal operative position, cover rails hinged lengthwise along one side of the upper and lower track means and swingable into covering relation thereto after the doors have been folded, and means for releasably holding at said extension beyond its normal operativeposi tion, a cover rail hinged lengthwise along one side of the track means and swingable to and from a position of covering relation thereto after the ' doors have been folded, yieldable sealing means least one of the cover rails in covering relation disposed longitudinally between the cover rail and to its track means. the adjacent door structure, and anchoring means 35 v12. In a folding door structure, a series of doors ~ engageable with the cover rail and door struc having means connecting adjacent doors in artic .ture for holding the doors rigidly in extended ulated relation on substantially vertical axes,` relation and for clamping the sealing means be upper and lower track means for guiding and tween .the rail and door structure. supporting the doors in movements from a posi 9. In a folding door structure, a seriesk of doors 40 tion of extended relation to a position of foldedV having means connecting adjacent doors in artic relation, said track means having an extension ulated relation on substantially vertical axes, track means forV supporting the doors in movements from a position of extended relation to a position of folded relation, said track means having an ex tension beyond the normal operative position of the folding door structure and the latter being movable as a folded assembly upon said extension> beyond its normal operative position, a cover rail hinged lengthwise along one side of the track means and swingable into covering relation there to after the doors have been folded, and means for releasably holding the cover rail in covering relation to said track means. ~ -beyond the normal operative position of the fold- ' ing door structure and the latter being movable» as a folded assembly upon said extension beyond its normal operative position, a cover rail hinged lengthwise along one side of the upper track means and swingable into .covering relation ' thereto after the doors have been folded, and means for releasablyA holding .the cover rail in 50 covering relation upon said track means, said lcover rail being swingable to one side of the track means, and means demountably engageable with the cover rail and the upper portions of doors DI 10. In a folding door structure, a series of doors 55 having means connecting adjacent doors in artic to `hold the latter rigidly in extended relation. . ROBERT A. MILLER. CARROLL HOWARD.