US1727399A

US1727399A - feldman

Info

Publication number: US1727399A
Authority: US
Publication date: 1929-09-10
Anticipated expiration: 1946-09-10

Description

Sept. 10, 1929. FELDMAN 1,727,399

PASS TYPE ELEVATOR DOOR Filed Oct. 10, 1927 2 Sheets-Sheet 1 ATTORNEY Sept. 10, 1929 H. FELDMAN PASS TYPE ELEVATOR DOOR Filed Oct. 10 1927 2 Sheets-Sheet 2 w// I 7 v A.

. lvlllrllllalrllrl/lfltfi Willi/III INVENTOR I /K%ORNEY Patented Sept. 10, 1929.

tJNlTEl) STATES PATENT OFFICE.

HARRY FELDMAN, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE PEELE COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF-NEW YORK.

PASS-TYPE ELEVATOR DOOR.

Application filed October 10, 1927.

My invention relates to pass type elevator doors, and more particularly to the novel construction and arrangement of the guide rail structure and the parts co-operating therewith.

In elevator doors of the so-called pass type there are two general constructions, in both of which the door is composed of two sections, movable vertically toward and away from each other in a manner corresponding to the ordinary counterbalanced elevator doors. It is essential, in pass type doors, that the arrangement of the parts be such that as one door in a shaft is opened, either or both panels thereof, usually both, will be brought to a plane parallel with the section of a closed door at an adjacent door opening. Of the two constructions of pass type doors herein referred to, and heretofore extensively used, one has the upper sections of the different doors in a shaft mounted upon vertically extending guides arranged in the same vertical plane, the lower sections of such doors being each mounted upon guides all in the same vertical plane which is parallel with the guides for the other sections of each door. The other type of bypass door is one in which a substantially continuous rail structure is used and the section of each door, during the opening and closing movement thereof, will have vertical movement with a horizontal component so as to bring each section in its entirety, in the same plane but parallel with the doors at adjacent door openings.

My present invention has to do with a construction of door in which each of the sections has only a vertical movement and in which one of the sections of each door, usually the upper section, is spaced inwardly of the shaft as compared with the lower section, so as to afford a pocket between the upper section and the wall of the shaft adapted to receive the lower section of the door at an upper opening, so that with the opening of a door at a lower opening, the upper section thereof may pass the lower section of a door closing an upper door opening, and with the opening of a door at an upper door opening, its lower section may pass between the upper section Serial No. 225,178.

of the door at a lower door opening and the wall of the shaft.

Heretofore, in this construction of door, it has been the common practice to provide guide rail structures employing a wall angle, the flange of which extending inwardly of the shaft had a depth approximating the aggregate thickness of bothdoor sections and the necessary clearances between these sections and between the lower section and'the wall of a shaft, the guide shoes being upon the edge of the section as in ordinary counterbalanced elevator doors. This wide wall angle not only involved a guide structure, the weight of which was such as to increase the difficulty and hazard of installing it in an elevator shaft, but involved the spacing of the sheaves over which the flexible connections between the door sections pass, a distance within the shaft sufiiciently great to necessitate extreme care in the mounting of the guide rails in order to ensure a proper support for the door structure from these sheaves; The doors of the general construction herein referred to, possess considerable weight, ranging from four hundred pounds upward per door, and the instability of the guide rail structure is, and always has been, a factor of great importance in such installations.

ldurtherlnore, it was a common practice, in pass type doors as Well as in counterbalanced doors, to so construct the top bar of the lower section that it engaged stops upon the guide rails when the upper surface of this top bar was substantially flush with the floor of the building, and thus afford what is known as a truckable sill, for the purpose of relieving the connecting chains passing about the sheaves from loads passing from or to an elevator car, and transmitting such stresses to the wall of the building through the guide rail structure.

\Vith the use of wide wall angles, the stops co-operatingwith this trucking bar were of necessity carried by and projected from the inwardly projecting flange of the wall angle, so that the support for the truck bar was so spaced from the wall of the shaft as to subject the wall angle to excessive stresses, particularly when heavy loads were passing over said trucking sill. Furthermore, when such stops were positioned a distance substantially equal to the thickness of a door from the inner surface of a lower door section, it was nec essary to provide a special construction of hanger bar so ofi'set as to project beyond and across the edge of the wall angle so as to be in engaging relation with the stops, and with a reverse offset to bring the bar in proper relation to the sheave. It was also necessary to provide openings in the wall angle, through which the sheave projected, in order to permit a proper running of the connections, although even with this construction, there was a deflection, inwardly of the shaft, of that portion of the chains running from the sheave to the lower portion of the upper door section.

WVith the above conditions in mind, the main object of my invention is to provide an elevator door of the pass type in which the wall angle has an inwardly directed flange of a depth substantially equalling the thickness of a single door section, so as to not only re duce the weight and bulk of the guide rail structure and thus facilitate its installation in an elevator shaft, but to bring the bearing point of all loads upon this rail structure sufficiently close to the wall of the shaft to minimize the effect of these loads upon the bolts or screws securing the wall angles to the wall of the shaft. ll ith the use of a guide structure embodying the invention, the sheave may be so supported that each of the door sections may be provided with means for securing the chains thereto in a manner which will ensure a substantially vertical run of these chains upon opposite sides of the sheave, notwithstanding the offset relation of the two door sections one to the other.

ii rail structure in a door construction embodying the invention permits the utilization of an angle or 'T-bar, incorporated in, and forming a part of, the top bar structure of the lower door section, in a manner to secure great strength and rigidity in this top bar structure and the firm support thereof, and of the door section in its entirety therefrom, when the door is in a fully opened position. In this construction the support necessary to the truckable sill feature is close to the shaft side of the door section.

The invention consists primarily in a pass type elevator door embodying therein two sections movable in parallel vertical planes and in opposite directions, guide rail struc tures adapted to be secured to the wall of an elevator shaft, each including therein two guides both of which are contained within a space of substantially the thickness of one of. said door sections, means carried by one of said door sections closely adjacent the wall of the shaft co-operating with one of said guides, means carried by the other door section and offset toward the wall of the shaft co-operating with the other guide, whereby said last nameo section substantially in its entirety, is positioned beyond said guide rail structure within the shaft, a sheave carried by said guide rail structure, and flexible connections passing over said sheave and connected with said sections respectively; and in such other novel features of construction and combinaion of parts as are h reinafter set forth and described, and more particularly pointed out in the claims hereto appended.

Referring to the drawings,

Fig. 1 is a condensed View, from the shaft side, of an elevator door embodying the invention;

Fig. 2 is a condensed vertical section through said door upon a larger scale;

Fig. 3 is a horizontal section through one side of the door shown in Fig. 2 while in the open position showing the lower section of one door in cross section, and the upper section of a lower door while in the closed position also in cross section; and

Fig. 4.- is a new similar to Fig. 3 showing the upper section of the door shown in Fig. 2 while in the open position in cross section, and the lower section of the door above while in the closed position also in cross section.

Like numerals refer to like parts througho the several views.

In the accompanying drawings the invention is illustrated in connection with a single door opening of an elevator shaft, the wall. of this shaft being shown at 10 and the metal buck about the opening therein, at 11. It will be understood that there a series of such openings in a shaft, one above the other, and that the construction herein described is duplicated at each door opening wl erein the conditions are such that the suace between the lintel of one door opening and the sill of the opening immediately above, is insul'licient to accommodate the door section which must move within this space during the opening movement of either the upper or lower door section. In new buildings there is ordinarily uniformity as to all the door openings in the shaft, except on the ground floor. in older buildings there is sometimes a variance in such door openings, some of them permitting the use of ordinary counterbalanced doors, and others requiring the use of pass type doors. It is to be noted that a pass type door may be used in conjunction with other pass type doors or with ordinary counterbalanced doors,

The door proper comprises an upper section 12 and a lower section 13, the details of construction of each of which, except as to the portion co-operating with the guide rail structure and the flexible connections between the door sections, are old and well known in the art, a metal sheathed wooden panel door section being il ustrated in the drawings.

While the guide rail structure extends substantially continuously adjacent all doors in a shaft, the invention can be more clearly understood by considering that the door in each opening has its own guide construction, which construct-ion laps the guide construction at an adjacent door opening, no part of the guide structures at adjacent openings being common to a door section at each of these open ings.

It is the common practice to have the lower section 13 of a door close to the wall of the shaft so as to avoid a gap between it and the sill, and to have the upper door section spaced within the shaft a distance greater than the thickness of the lower door section, thus forming a pocket between this section 12 and the wall of the shaft of SllfllClQlli) capacity to accommodate the lower section 13" of a door at an opening above that closed by the

sec tions

12 and 13, and to afford space inwardly of the shaft throughout the same area of the section 13 to accommodate the upper door section 12 of the door below.

This offsetting of the door sections has led to the use of a projecting astragal 14 carried by the upper door section, and the use of a movable lintel 15 which in the past has, in some instances, been n'iounted adjacent the lintel of the door opening and, in other instances, as shown in the drawings, on top of the door section 12. This construction, however, is old and well known in the art. 2

The offsetting of the section. 12 inwardly of the shaft in relation to the section 13 when a truckable sill is used, necessitates the employment of a top bar for the lower section 13 of a length substantiallytwice the thickness of a door section to avoid the presence of a wide gap between the shaft and the platform of an elevator car, which extended sill has usually been secured by means of a T-angle 16 secure- 1y bolted to the top angle of the frame of the lower door section, which angle 16 serves as a rigid support for a wide flange of the angle of the top bar proper of the door. This con struction forms a highly effective truckable sill, and one of the purposes of the present invention is to more effectively utilize the strength of this construction for supporting the lower section from the guide rail structure and transmitting the loads upon the sill to the walls of the shaft therethrough. The manner of accomplishing this will more fully appear hereinafter, as it results from the particular construction of the guide rail structure and the co-operating guide means carried by the respective door sections.

The guide structure comprises what is known as a wall angle 12', made up of lengths thereof which, when secured in position in a shaft, extends throughout all portions of the shaft where the doors are to be installed.

Those portions of the wall angle 17 adjacent each door opening, when a door buck is used,

have a deep flange 18 secured to the buck 11 by means of screw bolts. If desired, this flange 18, instead of extending'toward the jamb of the door opening, may extend away from this amb, it being a common practice, where the wall angle has to be secured to the masonry of the wall instead of to a metallic reinforcement thereof, to have the flange e2:- tend away from the jamb where it is more readily accessible for the purpose of running bolts entirely through the wall of a building, or using expansion bolts as a means of attachment of the angle to the wall.

In the accompanying drawings the use of a buck is illustrated, the flange 18 of the wall angle adjacent the buck bearing against same and being secured thereto, and a short wall angle or knee being used above the lunch as indicated at 19. The manner of securing the wall angle in place, however, is immaterial to the invention, it being merely necessary that the flange 20 of this angle shall be of a depth approximating the width of the lower section 13 so that the footof the T-bar 16 may extend beyond the side edges of the door section and across the inner edge of said flange 20 without bending the projecting end of said T-bar 16. The wall angle 17 is common to all door openings in a shaft.

Secured thereto are

rail angles

21 and 21, the former of which extends from substantially midway of the height of one door opening, to substantially midway of the height of the door opening immediately below, and the other of which extends from substantial- 1y midway of the height of said door opening to substantially midway of the height of the door opening above. This guide rail 21 or 21 co-operates solely with the

lower section

13 or 13 of a door, the guide rail 21 co-open ating with the door section 13 at one floor, and the guide rail 21 co-operating with the, lower section 13 of the door immediately above. Each

rail

21 or 21 et seq., is so located upon the wall angle 17 as to be suffciently close to the wall of the shaft to afford merely sufiioient clearance for the free running of the door.

Carried upon one edge of the door section 13 are guide members 22, such as ordinary guide shoes or other similar devices commonly used, which co-operate with the guide rail section 21. The lower section 13 of the door immediately above the opening closed by the sections 12 and 13is provided with like guiding means 22 co-operating with the guide 21.

It is customary, with vertically sliding doors, to so construct the door sections that they will lap the door jamb to a certain extent, the amount of this lap varying in different localities. In the present invention, the sections 13-43 are each provided at the vertical edges thereof with an angle bar known as a flame angle and indicated at 2323 in the drawings. The

guide shoes

22 and 22 are mounted upon this flame angle, suitable spacers 2d and 2% being used to properly locate the

guide shoes

22 or 22 with relation to the guide rail. This, however, is a more detail of construction and forms no part of my present invention, being merely for the purpose of permitting the standardization of the guide shoes in both the upper and lower door sections.

The flame angles and the shoes carried thereby are upon one side of the vertical center of the door section carrying same, one flange of the flame angle being substantially flush with the side of the door presented towards the elevator shaft. This arrangement leaves a space of substantially one-half the thickness of the door section 13, and permits the utilization of an inwardly directed flange 20 of a depth to be contained entirely within a space less than the thickness of said door section.

Each

upper door section

12, 12 etc., is guided in its movements by means of a

rail angle

25 or 25 one

flange

26 or 26 of which is secured to the flange 20 of the wall angle, and the

other flange

27 or 27 of which e2;- tends parallel with the

rail angle

21 or 21. This angle 25 is spaced from the wall of the shaft 10 a distance so as to be contained, in its entirety, within a space of substantially the thickness of the door section 13.

The

door sections

12 and 12 are each provided with a

flame angle

28 or 28" which pro jects from the

section

12 or 12 toward the wall of the shaft to an extent to pass the plane of the

door section

13 or 13 and permit guiding means, such as guide shoes 29 or 29 carried thereby, to co-operate with the

guide rail

25 or 25. A

suitable spacer

30 or 30 is provided to properly locate said guiding means 2929 with relation to the guide rail 25*25.

By the construction above described, the guide rail structure and the co-operating guiding means of both door sections of ach door, and of the corresponding sections of adjacent doors, are all contained within a space substantially that of the thickness of the door section which is located adjacent the wall of the shaft, thus affording necessary clearance for the projecting end of the hanger bar 16 beyond the guide rail structure within the shaft, and permitting the location of a sheave 31 upon the guide rail structure in a manner which will permit the flexible connection 32, co-operating with said guide sheave and with the two

door sections

12 and 13, to have a run substantially parallel with the wall 10 of the shaft, since the wheel of the sheave will be positioned upon the guide rail structure substantially vertically above the fitting 33 to which one end of the flexible connection 32 is connected, and with a portion of the head of the T-bar 16 nected with the chain 32, is connected. The narrow flange 20 and the guide rail 2525 ensure the proper locating of the sheave and at the same time afford a support therefor closely adjacent the wall 10 of the shaft.

Secured to the guide structure and project-7 ing inwardly of the shaft beyond the end of the flange 27 and the guide angle 25 in a position to be engaged by the foot of the T-bar 16 when the door section 12 is in its fully opened position, is the usual stop This stop is engaged by the foot of the bar 16 which projects beyond the side of the door, one face of this foot, that toward the wall 10 of the shaft, coming fairly close to the flange 27 of the guide angle 25. In order to utilize as much of the strength of the T-bar 16 as is practicable and to afford the necessary clearance for the projecting ends thereof to pass the gu W rail structure, one side of the head of said T-bar is cut away beyond the side edge of the door, thus leaving an angular portion of the l bar only. he remaining portion of the head is pierced, as shown more parrlv in Figs. 3 and l, to permit the pa ;r the turn buckle rod 3 1 therethrough, 4 lispensing with the use of special litor a c evis at this point.

The part marked 36 in the drawings is a fragmentary portion of a car of an elevator door.

From the foregoing description it will be noted that the construction and arrangement of parts is such to permit the utilization of a guide rail structure, the total projection of which, within the shaft, is no greater than the rail structure of the ordinary counterbalanced door, and the truckable sill of the lower door section is not only as rigid throughout as that of the truckable sill of a counterbalanced door, but is supported by the rail structure under exactly the same conditions as are present in the old type of counterbalanced door, a condition which heretofore in pass type doors has not been attained.

By reference to 2 of the drawings it will be noted that with the opening of the door therein shown in full lines, the upper section 12 will have movement in a plane parallel with the lower door section 13 of the door immediately above, and that the lower section will have downward movement in a plane corresponding with that occupied by said door section 13, and will pass between the section 12 of the door below and the wall of the shaft, as shown in Fig. 3. The narrow guide rail structure affords clearance for the projecting ends of the T-bar 16 within the plane of movement of the door section 12, as shown clearly in Fig. l of the drawings.

It will also be noted that the sheave 31 is located in the plane of movement of the door section 12, but on one side of the door, and that the chain 32 hangs plumb. This sheave with which the turn buckle bar 34 also conis only a few inches above the lintel of the door opening so that in no case is there any interference by same to the movements of the T-bar 16. In fact these sheaves are located below the steps 35 on the floor above so as to be protected by these stops.

The operation of the auxiliary or movable lintel does not differ from that in prior art pass type doors.

In the foregoing description, I have referred only to the construction at one side of the elevator door openings and ofthe door sections, it being understood that this construction is duplicated as to the other side 0 said opening and said sections.

It is desired to emphasize that with the construction herein described, the rail structure and all parts carried thereby, are within the plane of the inner surface of the door section 12, and that the space occupied by both sections of the door within the wall 10 of the elevator shaft, is but little more than that required for counterbalanced doors of the type using a T-bar as a part of the top bar structure of the lower door section in which one-half of the head projects beyond the surface of the door.

With the construction. herein shown and described, the various parts are standardized in accord with ordinary counter-balanced doors, excepting the assembly of the guide rail structures, and the particular construction of

theflame angle

28 or 28.

It will also be noted that no cutting of the wall angle is required to accommodate the sheave 31 or bring it in a location which will ensure a substantially vertical run of the

connections

32 and 34.

It is not my intention to limit the invention to the precise details of construction shown in the accompanying drawings. I be lieve it to be broadly new to provide, in a pass type door structure, a guide rail construction extending within the shaft a distance approximating the thickness of one doorsection only, which guide structure co-operates with two door sections movable in parallel planes.

Having described the invention, what I claim as new and desire to have protected by LettersiPatent, is j H 1 1. A pass type elevator door embodying therein two sections movable in parallel-vertical planes andinopposite directions, guide rail structures adapted to .be secured to the wall of, an elevator shaft, each including therein two guides both of which are contained within a space'of substantially the thickness of one of said door sections, means carried by one of said door sections closely adjacent the wallof the shaft (to-operating with one of said guides, means carried, by the other door section and offset toward the wall of the shaft co-operating with the other guide, whereby said last named section substantially in its entirety, is positioned beyond said guide rail structure Within the shaft, a sheave carried by said guide rail structure, and flexible connections passing over said sheave and connected with said sections respectively. V

2. A pass type elevator door embodying therein two sections movable in parallel vertical planes and in opposite directions, guide rail structures each embodying therein awall angle, the inwardly directed flange of which is of a depth substantially equalling the thick ness of one of said sections, one guide extending parallel with the wall of a shaft from substantially midway of the height of one door opening to substantially midway of the height of an adjacent door opening, and a second guide positioned inwardly of the wall of the shaft as compared with said other guide and extending from substantially midway of the height of one door opening to substantially midway of the height of an adjacent door opening other than that adjacent which the other guide extends, shoes upon one section co-operating with said first named guide, shoes upon the other section offset in relation thereto toward the wall of a shaft into engaging relation with said second guide, whereby said last named section substantially in its entirety, is positioned beyond the guide rail structure within the shaft, a sheave carried by said guide rail structure, and flexible connections passing over said sheave and connected with said sections respectively.

3. A pass type elevator door embodying therein two sections movable in parallel Ver tical planes and in opposite directions, guide rail structures adapted to be secured to the wall of an elevator shaft, each including therein two guides both of which are contained within a space of substantially the thickness of one of said door sections, means carried by one of said door sections closely adjacent the wall of the shaft co-operating with one of said guides, flame angles carried by the other door section projecting therefrom toward the wall of the shaft to an extent to pass the plane of said first named door section, means-carried by said flame angle cooperating with said rail structures co-operating with the other guide, whereby said last named section substantially in its entirety, is positioned beyond said guide rail structure within the shaft, a sheave carried by said guide rail structure, and flexible connectionspassing oversaid sheave and connected with said sections respectively. 7

4. A pass type elevator door embodying therein two sections movable in parallel vertical planes and in opposite direct-ions, guide rail structures each embodying therein a wall 'angle,the inwardly directed flange of which is of a depth substantially equalling the thickness of one of said sections, one guide extending parallel with the wall of a shaft from substantially midway of the height of one door opening to substantially midway of the height of an adjacent door opening, and a second guide positioned inwardly of the wall of the shaft as compared with said other guide and extending from substantially midway of the height of one door opening to substantially midway of the height of an adj acent door opening other than that adjacent which the other guide extends, shoes upon one section co-operating with said first named guide, flame angles upon the opposite edges of the other of said door sections projecting therefrom toward the wall of a shaft to an extent to pass the plane of said first mentioned door section, shoes carried thereby co-operating with said second guide, whereby said last named section substantially in its entirety, is positioned beyond the guide rail structure within the shaft, a sheave carried by said guide rail structure, and flexible connections passing over said sheave and connected with said sections respectively.

5. A pass type elevator door embodying therein an upper and a lower section movable in parallel. vertical planes in opposite directions, a guide rail structure extending within a shaft :1 distance substantially equalling the thickness of one of said sections, and including therein two guides, one of which extends from substantially midway of the height of a door opening to substantially midway of the height of a door opening below, and the other of which is positioned inwardly of the shaft in relation to said first named guide and extends from substantially midway of the height of said door opening to substantially midway of the height of a door opening above, means carried by said lower door section cooperating with said first named guide, means carried by the upper door section and offset toward the wall of the shaft co-operating with the other of said guides, whereby said last named section substantially in its entirety, is positioned beyond said guide rail structure within the shaft, a sheave carried by each guide rail structure, flexible connections passing over each sheave and connected with said sections respectively, a T-bar forming a portion of the top bar structure of the lower door section, the foot thereof extending across and closely adjacent the inner face of said door section, one portion of the head projecting within the shaft, and the other portion thereof across the top of the panel of said section, and the ends thereof projecting beyond the sides of the section. one side of the head beyond the section being cut away to permit the foot of the T-bar to come closely adjacent the inner edge of the guide rail structure, and stops upon said guide rail structures respectively in a position to be engaged by the foot of said T-.bar when the lower section is in position with the upper surface of the top bar of the lower section substantially flush with the sill of a door opening.

6. A pass type elevator door embodying therein an upper and a lower section movable in parallel vertical planes in opposite directions, a guide rail structure extending within a shaft a distance substantially equalling the thickness of one of said sections, and including therein two guides, one of which extends from substantially midway of the height of a door opening to substantially midway of the height of a door opening below, and the other of which is positioned inwardly of the shaft in relation to said first named guide and extends from substantially midway of the height of said door opening to substantially midway of the height of a door opening above, means carried by said lower door section co-operating with said first named guide, means carried by the upper door section and offset toward the wall of the shaft co-operating with the other of said guides, whereby said last named section substantially in. its entirety, is positioned beyond said guide rail structure within the shaft, a T-bar forming a portion of the top bar structure of the lower door section, the foot thereof extending across and closely adjacent the inner face of said door section, one portion of the head projecting within the shaft, and the other portion thereof across the top of the panel of said section, and the ends thereof projecting beyond the sides of the section, one side of the head beyond the section being cut away to permit the foot of the T-bar to come closely adjacent the inner edge of the guide rail structure, stops upon said guide rail structures respectively in a position to be engaged by the foot of said T-bar when the lower section is in position with the upper surface of the top bar of the lower section substantially flush with the sill of a door opening, sheaves supported by the guide rail structures within the shaft above the projecting ends of said T-bar, a fitting upon the upper door section, and a flexible connection passing over said sheave and extending in substantially vertical lines to the head of said T-bar and said fitting with its opposite ends connected respectively with said T-bar and said fitting.

7. A pass type elevator door embodying therein two sections movable in parallel vertical planes and in opposite directions, guide rail structures each embodying therein a wall angle, the inwardly directed flange of which is of a depth substantially equalling the thickness of one of said sections, one guide extending parallel with the wall of a shaft from substantially midway of the height of one door opening to substantially midway of the height of an adjacent door oneninsr, and a second guide positioned inwardly of the wall of the shaft as compared with said other guide and extending from substantially midway of the height of one door opening to substantially midway of the height of an adjacent door opening other than that adjacent which the other guide extends, shoes upon one section co-operating with said first named guide, flame angles upon the opposite edges of the other of said door sections projecting therefrom toward the wall of a shaft to an extent to pass the plane of said first mentioned door section, shoes carried thereby cooperating with said second guide, whereby said last named section substantially in its entirely, is positioned beyond the guide rail structure within the shaft, a T-bar forming a portion of the top bar structure of the lower door section, the foot thereof extending across and closely adjacent the inner face of said door section, one portion of the head projecting within the shaft, and the other portion thereof across the top of the panel of said section, and the ends thereof projecting beyond the sides of the section, one side of the head beyond the section being cut away to permit the foot of the T-bar to come closely adjacent the inner edge of the guide rail structure, stops upon said guide rail structures respectively in a position to be engaged by the foot of said T- bar when the lower section is in position with the upper surface of the top bar of the lower section substantially flush with the si 1 of a door opening, sheaves supported by the guide rail structures Within the shaft above the projecting ends of said T-bar, a fitting upon the upper door section, a flexible connection passing over said sheave and extending in sub stantially vertical lines to the head of said T-bar and said fitting with its opposite ends connected respectively with said T-bar and said fitting, and a movable lintcl carried by and movable with the top of said upper section.

In witness whereof I have hereunto affixed my signature this 7th day of October, 1927.

HARRY FELDMAN.