US2327316A - Door construction - Google Patents

Description

W 943. N. MICHELE/IAN 2,327,316

' DOOR CONSTRUCTION Filed Aug. 11, 1942 5 SheetQs- -Sheet 1 ATTORNEY Aug. 17, 1943. N. MICHELMAN DOOR CONSTRUCTION 3 Sheets-Sheei 2 Filed. Aug. 11, 1942 INVENTOR.

ATTORNE Aug. 17, 1943; N. MICHELMAN 2,327,316

DOOR CONS TRUCT ION Filed Aug. 11, 1942 3 Sheets-Sheet 3 M IgVENTOR.

l ATTORNEY industrial buildings.

constructions.

Patented Aug. 17, 1943 UNITED STATES PATENT OFFICE noon CONSTRUCTION Nathan Michelman, Brooklyn, N. Y. 1 Application August 11, 1942, Serial No. 454,473

which are elevated to open position abovethe doorway, as employed in wharves and other industrial buildings, where maximum clearance for afiording ready access to loading'platforms and storage space is essential. v While my invention, as will be manifest from the description thereof, may be advantageously employed in various other constructions, in-- cluding'garages and similar structuresyI have elected to present it as it may be practiced in the construction and operation offwh'arves and However, this is merely illustrative and is not to be construed, in any sense, as a limitation 'of the scope of utility ofmy invention, i

Doors of the general type of my invention are largely used in industrial structures, especially in conjunction with the operation of loading platforms and other freight handlinginstallations and the general object of this invention is to provide a jack-knife typ'e'of door of a simple and ruggedconstruction which may be readily installed at a minimum of cost in existing as well as new structures, with accruing operational and security advantages which; heretofore, have not been obtainable in folding doors or the same general character.

More specifically, it is'the primary object of this invention'to provide a door construction of the bi-fold or so-called jack-knife type, comprising cooperatingdoor sections hinged for elevation from a vertical closed position to anopen position above the doorway, for storage in superimposed relation to project outwardly of-the doorway, in the manner of a canopy, wherein the door sections in the termination of their descending movement will be impelled inwardly from a canted position relative to the doorway, into vertical alinement within the doorway jambs, in closure-forming position, thereby insuring dependability in operation and obviating any possibility ofthe door sections jamming or coming to'rest within the doorway in a tilted position, so that they must be manually urged into alinement, as is of frequent occurrence in existing An important object of my invention is to provide a sectional door construction, as aforesaid,

, wherein the door sections in their movement to closure-forming position, will'be automatically locked or secured in such position, thereby elimi- 14 Claims. (01. 160-190) nating supplemental manual or other locking operations now required in doors of similar types, and adding materially to the security of the closure against tampering from without.

Another important object of my invention isto provide a sectional door. construction having the aforesaid characteristics and advantages, in which the door sections are automatically unlocked in the movement of one ofv the door secabout the doorway, cleared, to afford access to the locking media, for locking and releasing the door, a

It is also an object of this invention to provide a jack-knife type of door, as aforesaid, which may be readily operated to open and closed posi-- tions, the lower door section, in the initiation of theimovement of the door. to open position, being struction.

impelled outwardly in a radial movement from its vertical closed position, thereby contributing to the overcoming of the forces of inertia and facilitating the operation of the door-sections to open position.

Further, it is an object of this invention to increase the safety factor in the operation of doors of the jack-knife type, by providing a simple and efficient means adapted to function to arrest uncontrolled downward movement-of the door sections, such as would result from the accidental release of the door sections from control of the operating mechanism, as would occur in the breaking of a cable or other mishap.

Other objects and advantages flowing from the practicing of my invention will become apparent as the description proceeds.

In the accompanying drawings, I have shown a preferred and practicalembodiment of my invention, as it may be employed in industrial con- However, my invention may take other forms, to meet different production and installation requirements, as will be evident, within the spirit and scope of this disclosure.

In the drawings:

Figure 1 is'a rear elevation of a sectional door construction. conforminz to my invention.

Figure 2 is a side elevation of the structurev of nisrn.

Aguideway or track Figure is an enlarged longitudinal sectional iew, taken on the line 5-5 of Figure 1.

Figure 6 is a vertical sectional view.c-n the line E% of Figure 5. v

Figure 7 is a'sectional elevation on the line 'i'-'l of Figure 5; and

Figure 8 is a fragmentary view in elevation, partly in section, of the two door, sections and one of the interconnecting hinges.

Referring now: to the drawings in detail, in which like characters of reference are employed to designate similar parts in the several views, the door or closure comprises an upper section illand a lower section 1 l, the upper section being hinged, as at 12, to the head of t -e doorway 13 for rotative movement upwardly and out- The hinge connections.

wardly relative thereto. l2 may be of any preferred type. is herei shown, each hinge comprises a supporting member 12a, fixed to the headof the doorway i which embodies 'a dependent bearing portion 21) adapted to be entered in the bifurcated bearing 12 of the hinge element iild secured, to the top edge of the upper door section It, the two bearings being interconnected for relative arcuate "movement by a pin l2e.

The lower door sectionv ii is hinged along its top edge to thebottorn edge of teupper door section, as generally indicated at M, for rctative movement upwardly and inwardly relative to the upper door section, so that when the'two door sections are conjointly elevated to extreme open 1 .position, they will-'be'disposed outwardly of the v doorway frame,inSuperimposedrelation, in the manner of a canopy, as shown in Figure 2.

."Ihev aforesaid hinges i2 constitute, the sole connection between the upper door section and the doorway frame, the'movem'ent of the upper section to and from open position beingefiected in responseto the actuation of the lowerdoor section, connected thereto, by the functioning of the door. operating mechanism which, as herein shown and generally indicated at m is or. a conventional type, utilizing a counterweightw for 'counterbalancing the variable load, of the door sections in their movement to and from closureforming-position, in which latter position they are disposed in vertical alinement parallel to the side members 530; of the jamb ofthe doorway.

Inlieu of the counterweight'type of operating mechanism illustrated, the door sections may be counterbalanced and theircperation controlledby spring my co-pending application, Serial No. 421,272,

means, .suchas are shownin filed December 2, 1941, or other suitable mecha- 55 is disposed in parallelism'with each side memberof the doorway frame, which is adapted to be traversed by a roller it mounted on a shaft ll fixed to and projecting laterally fronr the bottom of the; lower means of connection between the cable and the lower door section, the lifting effort, as will be obvious, being transmitted therethrough. The camelement it, as shown, embodies a serrated .nose loo; and an offset counterbalance portion 18b, tending to rotate said element, to reverse the-position of said nose relative to the axis of said element, the cable it? being connected to said'cam element in alinement with the axis of rotation thereof, as aforesaid, so that normally,

. when the cable isin tension,.the nose of said element is ina dependent position substantially in-alinement with the axis of rotation of said element. Should the cable i9. snap or any. other breakdown of the. operatingflmechanism occur, that would release the door sections for uncontrolled descentfsuchdescending movement will be arrested at its inception, as the cam element 13 is freed from'the. cable tension and rotates on the shaft ll, uhder'theinfiuence of its counterbalance portion 2.82), to dispose the 11059 .811 thereof for engagement with a fixed. surfaceof the door. jamb, as the opposed flange or" he guidewayi, in a jamming action, induced by the downwardly applied impulse effectl'v'e thereon, to

; arrest the uncontrolled movement of the door sections and retain them in arrested position, un-

til the cam element is released from braking position by the restorationof the cable or operating'me'chanism to ajcondition whereby the cable again functions .to support the load through said cam element.

' able,as shown in Figure 1.

From the'description thus far, it will be manifest that the door sections are operable from their vertical closure-forming position; in response to "the actuation of the operating mechanism inone direction, to open position, the lower door section swinging inwardly n the hinge line l4, beneath I the upper door ection, as therollers l6 traverse the guideway l5,'the axis of rotative movement of the lower door. section relative .to thedoor frame'and to the upper door section being defined by the shafts l'latieach endv thereof. When the door sections are ineXtreme open. position, as shown in Figure 2, the load is counterbalanced rbyithe counterweightw, the operating mechanism, preferably, being lockedagainst accidental operation by any suitable device In the. present showing, this takes the form of a so c'alled latch Z, with which the operating chain c is. engage- The actuationof the operating mechanism: in the opposite direction, controls the movement of e the door sections to closedposition, the lower-section swinging away from the upper door section in a downward movemennas the rollers lfi traverse the guideway l5, producing a concurrent in- -ward movement-ofthe upper doorsectionon its hinge line Hi, this opposite arcuate movement of the hingedly connected door sectionscontinuing until the lower door section reaches its limit of downward movement, when it is impelled.- indoor-section ll, as-shown in Figures 1 ,andb, in

;wardly in an arcuate inovement'from an outwardly canted-positionrelative to the doorway,

to-its ultimate vertical position therewithin, in ducing a corresponding movement of the upper door section to complete the closure-forming operation, bothdoor sections being then vertically alined between the door jambs, as shown in Figure 1. The door-alining impulse is generated in a lever-like inward movement of the canted lower door section on a fulcrum formed by the impinging engagement of the rollers 60 with fixed stops 6i disposed on the respective door jambs [3a, in the path of movement of said rollers, as the door section descends, as clearly shown in Figures 5 and 6. The rollers'60, as herein shown, are mounted on arms 62 fixed to the lower door section H and projecting forwardly and laterally of each end thereof, the stops 6| taking the form v of angle pieces or brackets welded or otherwise rigidly secured to the door jambs in suitably spaced relation to the floor line to attain the desired result,

For preventing manipulation of the door sections from without, when they are in closureforming position, means are provided for automatically locking the lower door section in engagement with the door frame, as it is impelled into its final vertical position between the jambs, the lower door section when thus locked in closure-forming position, serving to retain the upper door ection in similarly functioning position, in alinement therewith. The aforesaid locking means are also automatically displaceable from engagement with the door frame, in the initiation of the upward movement of the lower door section toward open position, means being provided in cooperation therewith to impel the lower door section outwardly on its axis of rotation, this outward movement being communicated to the upper section to cant the latter from its vertical position and facilitate the continued movement of both door sections to storage position, at the head of the doorway, in the manner heretofore described. V I

In the present embodiment, the-meansrfor locking the lower door section in engagement with the doorway jamb I311, comprises a latch plate 2i disposed transversely of the end-forming channel member Ha of the frame of said lower door section, one end ofsaidplate extending through the outer flange of said channel mem ber, which may be slotted or cut away for-the purpose, for pivotal connection, as at 22 to the bracket 23 mounted on the'anterior surface of said flange. The other end of-said latch plate embodies a nose E l, undercut as at 25; whichsimilarly extends beyond the opposite flange of said channel member lid, for engagement with the base of a slot I31) provided in'the jamb l3a of the doorway, in the relative rotative movement of said plate, parallel to the web of the channel member, on its fulcrum 22, as hereinafter described. The bracket 23 and the associated end of the latch plate 2|, preferably are enclosed in a housing 26 fixed to the-outer flange of the channel member I la to protect the latch against tampering from without.

Slidably mounted between the flanges of the channel member I la, in juxtaposition to the bot tom of the lower door section, is a plate 21 slotted as at 28 for the reception of the aforesaid shaft ii which is fixedly supported from said channel member I id for movement therewith, in the functioning of the roller 56 and said camelement l8, mounted thereon, as heretofore described. A pin 29, likewise fixed to the channel member I la, projects within a second slot in said plate 21, in

vertical alinement with the slot 28 therein, the upper end of said plate embodying a clevis3l for the reception of a pin 32 connecting it to the lower end of the turnbuckle 33, the upper end 5 of which is similarly connected, as at 34, to the rod 35. The rod 35 is reciprocable in a bearing provided by the bracket 36, a compression spring 3'! embracing said rod being interposed between and connected to said bracket and the collar 38 at the lower end of the rod 35.

Pivotally mounted on the web of the channel member Ha as at 39, adjacent the top edge of the lower door section, is a lever or so-called impulse arm iil which is connected by a link 4| to the upper end of the rod 35for rocking movement on its fulcrum 39, said rod 35, adjacent the upper clevis end 4-2 thereof, to which said link 4| is pivoted, embodying an offset'or lateral projection 43, the upper end of which is slotted for the reception of the latch plate 2|, the actuation of which is controlled thereby, in response to reciprocatory movement of the rod 35 as hereinafter explained.

With the door sections vertically disposed in closure-forming position, as shown in Figure 3, it will be observed that the shaft I! and the pin 29 are in engagement with the lower ends of the respective slots 28 and ihiof the plate 2?, the spring 3! being in tension, with the nose of the latch plate. 2| in door-locking engagement with the slot fifth of the doorway jamb lea; also that the free end of the impulse arm 4i: is in abutmentwith the opposed flange of the jamb, it being obvious that the flange of the channel memher iia is interrupted in the area of said arm,

to provide for such engagement with the doorway jamb.

When the upward movement of the lower door section is initiated, in response to the actuation of the operating mechanism, the shaft I? and the pin 29 are displaced upwardly within the respective slots of the plate 2?, the resultant reaction of the compression spring 3? efiecting longitudinal movement of the plate 2'! and con- ;nected rod 35, to lift the latch plate 2i bearing upon the offset actuator 13, on said rod, out of engagement with the cooperating slot E3?) of the doorway jamb. The continuing upward movement of said rod 35, under the impulse generated by the reaction of the spring 31, as aforesaid, thereupon becomes effective upon the arm 48, through the linki, to cant said arm on its pivot 39 in abutting engagement with the doorway jamb,the lower door section being impelled outwardly thereby, in a rotative movement on the axis of rotation of said rollers I 6, in traversing engagement with the guideway l5. As the lower door section is tilted outwardly, the upper door section Ii), hingedthereto, is likewise urged outwardly, the continuing upward travel of the rollers l5 along the guideways i5, conjointly actuating the two door sections to their extreme open position, as heretofore described.

When the door sections are lowered to assume aic lat t d p-inifo ow e.en a ementwith he u t r-pr ie ti n' s o l-said ro to ent r-the nose-of said latch plate inlocking-engagementwith theecooperating'slot i3b-o theideorway jamb, .the movements: of ther parts. being the-ree verse-of thosepreviously :describedin the eleva' tior v oi the doorsections-L esvrr vio s w po d o t. n: hal door-section is locked in closure-forming; -p9si: tion, the upper door section-is retained ini-its closure-forming position thereby; the hing-econnection between the two functioning as a virtual continuation of the two sectionswhen they are vertically disposed. in closed position;

A preferred'form of binge for connecting the two door sections for relative rotative movement, as-shown in detail inFigureg8, includes a bear-- ing member M adapted to be fixed to. the bottom'edge of theupper 'door section and asecond-bearing member i iesecured-to the top of the-lower door section;each-.ofathese members. embodying laterally sp-acedapertured lugs :35 be.- tween which a plate or leaf 4'! provided with bearings "58 at each end ismounted, the plate being connected to the respective members it and 45 by suitable pins (is entered in said aper- 4? and the respective-bearing members 3 3 and 45 are rotatable with relation to each. other; ro

tative movement of theplate or leaf it a directionoutwardlyiof the connected door section; however, being prevented by the abutment formed on the bearingmember with wh the plate 41 is engaged; when the plate and door sections are vertically disposed in the c sure-forming position of the assemb y.- limiting the direction of. movement, of the 4! with relation to the door sections, lost motion is eliminated between the connected Lions, in the operating, of the door, lifting effort appl' to the lower door section becoming immediat effective upon theupper door section; tr 1 insuring more rapid and eficient operat on obviating jamming which not in: e

the breaking out of the door sections.

other types of hinges are usedfor their interconnection.

To cover the gap between the two-door sections,

as connected by thehingesqust described, an apron is fixed to the face of theupper door section, as by bolting or other means for-overlaps ping engagement. with the face of the lowerdoor sectionywhile a similar apron 52is-fiXedit-o the inner face of the-lowerdoor section i for abuttingengagement with th interior floor of the loading platform or the like. A- weathereproof bumper of resilient: material, preferably rubber, is disposed longitudinally ofthe bottom of-;the outside of. the lower doom-as. indicated at 53, suit. able Weatherstripping; (not shown) being: provided between the door sections. and-the doorway jambs to render'ithe construction stormtight. To insureastormtight seal at theheadlineof the doorway, the top edge forming member of the upper door section ifizis preferably L-shaped 1n cross section, the depth of the flange eifia'thereofwhich is disposed parallel to the inner'faceof the door section, approximatingthe height of the clearance between the top'of the-upper door section, as defined by the'fiange ifib'of said-member,- and-the opposed-surfaceof the head of thedoo; way, so that when the upper door sectionris in vertical closure-formin position, the edge of said fian elllwwill be disposedin-proximity to or. abut upon; the head?! 3 oi the doorway; behind or :in.-:- wardly iof' the hinges. I 2.: A 'weatherproofzplate i3 extends-across the 'top of, the upper door section l0, and is swingably suspendedzfromthe headi3 01 the doorway :on :the outer; side of the hinges I2, asby the U.-bolts Mfcr abuttingengagement with the exterior surface. of: the. .door: section, it bein obvious that; said; platev will .move in conformity with; the movement of; said. door section to, and from closure formingposition. I

While): have describedzbut one latch plate and cooperating -impulse arm-it: will-be understood that similar assemblies are associated :with-each ofgtheiend-formingchannelmembers of the lower door frame,- the doorsections being of any pre ferredconstruction,it=beingobvious thattheendforming membersoflthe upper doorneed not nece essarily be channel-sections. As herein shown, the door sectionsare of. a conventional sheet metal design, the frames of the sections being ;re-. inforced by the. customary idiagonal' bracing members, with lights. centra11y;located= in the upper doorfsection; asshown in-Figure 1.

, It will be manifest-that inpresentirr my invention, I have confined it more or less :to the specific embodiment herein shown. However; various changes in: the, structural detailsthereo! may be 'efiected, .as well as in the cooperationof the elements of the assembly, in attaining. ,my objectives, as .hereinbefore set forth, within the scope of the appended claims I claim:

1.:A door comprising-an upper section pivotally mounted-,at-its top for-upward and outward swinging -movement from avertically disposed closed: positionto an openpositio-n, a-lower sec.-v tion hinged atits top to saidv upper scctionfor upward and inward swinging movement relative to'said upper section .from a vertically disposed closed position .tolan-iopen position, means con-v nected. to said .lower doorsection forconjointly actuating both of said door sections to open and. closedpositions, means carried by said lower door section for automaticallylocking the-lower door section in vertically disposed closed position in l'eSDO s -the movement of said lower door secs tion-to closed. position, saidupper door :section being.retained-,-in :closed position thereby, said lockingmeans being rendered nomefiectiveinan initial upward; vertical movement of said lower; door section, and means automatically ;functi0n-, ingdn the. continuing upward-movement of said lower door'section .to. swing said-lower door sec-. tion outwardly and simultaneously, cant said .up-.. per door section for. conjoint-upward movement ofgthe two door sections to open position.

2.-. A door. comprising an upper section-pivotally mounted-at its top for :upward and outward swinging movement from a verticallyidisposed closedposition-to an open position, a lower sec.-. tion hinged-at its-topto said upper sectionzfor upward and inward swinging movement relative. to a said upper section from 1 a vertically disposed closed-,position toan open-position, means con-. nected to said lower door sectionafor; conjointly actuating both of said door sections. to open: and closed positions: means carried by said lower door. section automatically efifective inresponse to the movement. of said lower; door section: to closed position, tov retain both'of said door sections in i ent in werticallyr disposed: :closed position; said: retaining .;mean -,becoming1non-efiective' in a predetermined initial. upward vertical movc-' menial of said lower, door sectionand means. auto-e matically functioning when :said retaining means become non-effective to impe1 said lower door section outwardly and induce a like directional movement of said upper door section, in the continuing upward movement of said lower door section, for the ultimate disposition of both door sections in open position.

3. The combination with a doorway, of a closure therefor, comprising a door having an upper section hinged to the top of said doorway for upward and outward swinging movement from avertically disposed closed position to an open position, a lower door section hingedat its top to said upper door section for upward and inward swinging movement relative to said upper door section, from a vertically disposed closed position to an open position, operating mechanism for controlling the conjoint movement of both of said door sections to open and closed positions and fixed means on said lower door section engageable with said doorway in the termination of the downward movement of said lower door section to closed position, to retain both of said door sections in alinement in vertically disposed door-way closing position.

4. The combination with a doorway, of a closure therefor, comprising a door having an upper section hinged to the top of said doorway for upward and outward swinging movement from a vertically disposed closed position to an .open position, a lower door section hinged at its top to said upper door section for upward and inward swinging movement relative to said upper door section, from a vertically disposed closed position to an open position, operating mechanism for controlling the conjoint movement of both of said door sections to open and closed positions and fixed means on said lower door section engageable with said doorway in the termination of the downward movement of said lower door section to closed position, to retain both of said door sections in alinement in vertically disposed door-way closing position, said retaining means being displaceable from engagement with said doorway in an initial upward movement of said lower door section, to permit of the conjoint movement of both of said door sections to open position.

5. The combination with a doorway, of a closure therefor, comprising a door having an upper section hinged to the top of said doorway for upward and outward swinging movement from a vertically disposed closed position to an open position, a lower door section hinged at its top to said upper door section for upward and'inward swinging movement relative to said upper door section, from a vertically disposed closed position to an open position, operating mechanism for controlling the conjoint movement of both of said door sections to open and closed positions, means in pivotal engagement with said lower door section engageable with said doorway in response to the impelled inward movement of said lower door section to vertical position, to retain both of said door sections in alinement in vertically disposed doorway closing position, said Closed to an open position, a lower door section hinged at its top to said upper door section for upward and inward rotative movement relative to said upper door section, froma vertically disposed closed position to an open position, a guide way incorporated in said doorway, means carried by said lower door section'formed to traverse said guideway in the movement .of said lower door section to open and closed positions, operating mechanism connected to said lower door section, for eifecting the conjoint movement of both of said door sections to open and closed positions, meanscarried by said lower door section engageable with said doorway in the terminal portion of its downward movement effective to retain both of said door sections in closed position, said retaining meansb'eing displaceable from engagement with said doorway in the initiation of the upward movement of said lower door section toward open position, and means operable in sequence to the displacement of said retaining means from doorway engaging position, to abut said doorway and tilt said lower door section outwardly on the axis' defined by said guideway-traversing means in engagement with said guideway, in the continuing'upward movement of said lower door section, the tilting of said lower door section effecting a like directional movement of said upper door section for the conjoint movement oi-the two door sections to open position, in the continuing; operation of said controlling mechanism.

7.The. combination with a doorway, of a closure therefor, comprising a door having an upper door section hinged at its top to the head of said doorway for relative upward and outward rotative movement from a vertically disposed closed to an open position, a lower door sectionhinged at its top to said upper door section for upward and inward rotative movement relative to said 7 upper door section, from a vertically disposed closed position to an open position, a'guideway incorporated in said doorway, means carried by said lower door section formed to traverse said guideway in the movement'of said lower door section to open and closed positions, operating mechanism connected to said lower door section, for effecting the conjoint movement of both of said door sections to open and closed positions, means carried by said lower door section engageable with said doorway in the terminal portion of its downward movement effective to retain both of said door sections in closed position, said retaining means being displaceable from engagement with'said doorway in the initiation of'the upward movement of said lower door sectiontoward open position, and means operable in 'sequence to the displacement. of said retaining means from doorway engaging position, to abut said doorway and tilt said lower door section outwardly on the aXis defined by said' guidewaytraversing means in engagement with said guideway, in the continuing upward movement of said lower door section, the tilting of said lower door section eiiecting a like directional movement of said upper door section for the conjoint movement of the two door sections to open position, in the continuing operation of'said controlling mechanism,& and: a Tidevicei carried. :by: said. lower door section and COI'lIlGIZtBd'LitO said operating -me'ch'anism5. adapted to fengagemsaidi doorway to arrest zdownward: movement. of. :said-v'door zse'ctions zupon vzs'aidt operating :mechanismi becoining non- .efiective Lin" controlling:thezmovem'entnof isaid door-sectionsto or'fnoni open position. v

BJA door 'rconstructioni;acomprising: an zupper doorsection'radapted: ItO-ibe hinged/along iits stop :edgei i lithe. head off .a a doorway fori relativermo- -tativeimovement upwardly; and outwardly :from awertically). disposed. closure-forming: position to anmopenn positiomza: lower door s'section, .vmeans for 'oonnectingz said: We1'i dO0I'f section to :said uppendoor section :for:upward and inwardirotative movement. relative ato issaidiupper; door :section :from a ozertically disposed closure-forming posi- -tioni:to= an open position and meansiat :the bot- :tom :ofrsaid lower-doorsection adapted J10 ztravierse a guideway associated with a doorway frame; said oonnectingz'm'eans comprising azp'luralityzof ;hinges,:.:eachdncluding adbearingfimemberi:fixed .to ztha-bottom ::edge: of the-upper: door: section, a; second: bearing member fixed tot-the top "edge ofr'saidalower dofor section in alinement with'. the ib'earing'memberlon :the'z upper-doorv section',i:and a:plate-like1element shaving bearings ;formed' at its opp'ositerends entered between. ithe respectiye bearing members and a pin connecting 1 said bear- :ing: member andqsaidtlplate;ioropivotalrmovement, ithe' respective ido'ore sections; sbeing. oppositely? rotatable .as aforesaid; relatively :to- :said platedike element; said lower door section being rotatable on the axis of said guideway'traversing 'means.

-:9.J A door construction comprising. an upper door section: adapted; to :be hinged l along; its top 'edge tonthe head of. a doorway for relative rotative movement upwardly and. outwardly from a vertically disposed closure-forming. position to an open: position, a alower door #s'e'ction, means :for oonne'cting said lower door section ;to isaidiupper door :section: for upward. and'inward rot'ative movement relat-ive to said upper door nsection lfromva vertically-disposed c llre'efo i 'p sition:to an=open position1and means atthebottom of said lower door section adapted 'toitravuse a" guidewayassociatedwitha doorway frame; 'said' connecting means: comprising a plurality. of hinges, reachxin'cluding a bearing :member fixed to-the bottoml-edge of the upper door se-ctionga second bearing member-fixed to the ztopeedge of said-lower door section in .alinement-wvithithe bearing :member on the upper door section; :and a plate-like element:havingibearings formed: at .itsxr-oppositeiendsrentered :between'it-he respective bearing members and apin eonnecting saidlbearring'imember-aandezsaidc plate for .:pivotal.i'movement, the:srespective door:sectionsubeing oppoisitely rotatablew;as aforesaid; relatively itorsaid p1ate=like selement ssaidi bearingrz'member'ifixed :tos's'aid upperrdoor. sectionvembodying: a "stop .for engagement: by said plate-liketazelement to limit outward rotative :imovement "of wsaid element, rwhereby in the initiation: :of the fmovementv of :the door sections to: :open :position, 1 an; outward -movement-ofsaid: lower door section on the axis oft-said guideway 'tIfiVGISiIlfllrHIEQHS; :will produce .a/correspondingr outward I movement of i said 2111)- zper. door. section, :canting :eiiortbeing transmitted from; said. lower door section through-said :elementnengagedwithlsaid stop to the/upper door section.

.1.0.. 'Ihe combination with a-doorway, of -.a closure therefore-comprising adoorhaving an upper door section hinged at its top to the head :ofi saiddoorway for relative upwardcand out- -ward-rotative movement from averticallynis- Y posed-closed to an open position, a. loweridoor "sectionhinged at its top to'said upper door sec tion for upward and inward rotative movement relative to said'upper doorsection, from a vereticallyadisposed closed position to an open, position, a guidewayincorporated in said doorway, -means carriedby said lower. door section formed to i-trav-erse"said -guideway in the movementof saidlower door section to open and :closedpo- :sitions," operating 'mechanism'connectedto said l'owendoorsection, for effecting the conjoint :movem'ent of'both of saiddoor sections to open 'andvclosedpositions; means carried by'said lower door section .engageable with'said' doorwayin the terminal portion of its. downward movement refate'ctive to retain both of said door sections in closed position, said retaining means beingdisplaceable from engagement with said doorwayzin the initiation of the'upward movement of :said lower door seotionntoward open position, and means operable in sequence to thedisplacement of said retaining m'cansfrom doorway engaging position, to abut-said doorway and tilt said lower door is ction outwardly on the axis defined'by said guideway-traversing means in engagement with said'guideway, inzthe continuing upward 'inovement'oi said :iower door section, the tilting of: said lower door section effectingolikedirec 'tionalmovement of saidupper door section for the conjointmovernent of the 'two door sections to open positiomin the continuing operation. of vsaid controlling'mechanism; andimeans for ar- -resting .the. downward'movement of said doorsecticns; when such movement is not "controlledbv said operating mechanism.

- '11. The combination with -a doorway, of a closure thereforgcomprising: a. door having: an upper sectionhinged to the top of'said' doorway fori upward andioutwardiswinging :movement fromi atverticallyidisposedclosed position to an open position, aflower' door section hinged at its .top to said upper. door section :for upward and :inward swinging movement-re1ative;to said upper door section, from a vertically disposedi'closed position to an open position, operating mechanisin for controllingthe conjoint movement :of 'bothxof said door sections to open and closedpo- .:sitions,v.andimeans movable-With said lower door isection, formed for engagement with said doorway'in the termination of the descending movement vof saiddoor section in canted relation to said doorway, to impel said lower door section inwardly into verticalposition within said doorwayand produce a concurrent like directional movement of said upper door section, to simultaneously dispose both of said door sections in vertical-valinement in closure-forming position, and means-carried by said lower door section antomatically engageable with said doorway in-rensponsetto the impelled movement of said lower door section to vertical position, to retain both of said doorsections in. closure-forming position. 12. The combination with a doorwam of'a closure therefor, comprising a doorw'having an upper section hinged to the top of said doorway for upward and outward swinging movement from a vertically disposed closed. position to an open position; a lower door section hinged at its top to said upper door section for upward and inward swinging movement relative to said upper doorsection, from a vertically disposed closed position to an open position, operating mechanism for controlling the conjoint movement of both of said door sections to open and closed positions, and means movable with said lower door section adapted for engagement with said doorway to impel said lower door section into vertical position within said doorway, at the termination of the movement of the two door sections from open to closed position and produce a concurrent like directional movement of the upper door section, to simultaneously locate both of said door sections in vertical alinement in closure-forming position.

13. The combination with a doorway, of a clocure therefor, comprising a door having an upper section hinged to the top of said doorway for upward and downward swinging l iovement from a vertically disposed closed position to an open position, a lower door section hinged at its top to said upper door section for upward and inward swinging movement relative to said upper door section, from a vertically disposed closed position to an open position, operating mechanism for controlling the conjoint movement of both of said door sections to open and closed positions, means movable with said lower door section formed for engagement with said doorway in the termination of its descending movement in outwardly canted relation to said doorway, to impel said lower door section inwardly into vertical position within said doorway and produce a concurrent like directional movement cfsaid upper door section to simultaneously dispose both of said door sections in vertical alinement in closureforming position, means in pivotal engagement with said lower door section engageabie with said doorway in response to the impelled inward movement of said lower door section to vertical position, to retain both of said door sections in alinement in vertically disposed doorway closing position, said retaining means being displaceable iii from engagement with said doorway in an initial upward movement of said lower door section, and means carried by said lower door section automatically operable in response to the continu ing upward movement of said lower door section to engage said doorway to impel said lower door section outwardly and cant said upper door section, for ultimate disposition of both or" said door sections in open position at the top of said doorway in the termination of the conjoint upward movement of the door sections,

14. The combination with a doorway, of a closure therefor, comprising a door having an upper section hinged to the top or said doorway for upward and outward swinging movement from a vertically disposed closed position to an open position, a lower door section hinged at its top to said upper door section for upward and inward swin' movement relative to said upper door section, from a vertically disposed closed position to an open position, operating mechanism for controlling the conjoint movement of both of said door sections to open and closed positions, a forwardly projecting arm fixed to said lower door section, at each end thereof and offset laterally therefrom, each of said arms having a roller mounted thereon, and a stop disposed at each side of said doorway in the path of movement of the respective roller in the descent of said lower door section in outwardly canted relation to the doorway, said rollers being adapted to impinge upon said stops to rock said lower door section inwardly from said canted position to a vertical position within said doorway, the inward arcuate movement of said lower door section producing a concurrent like directional movement of said upper door section, to effect the simultaneous vertical alinement of the two door sections in closure-forming position.

NATHAN MICHELMAN.

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