Title:
Hangar door operating mechanism
United States Patent 2425016


Abstract:
The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon. This invention relates to closure operators and particularly to power operators for large hangar doors and the like, and among other...



Inventors:
Weaver, Edgar R.
Application Number:
US56890944A
Publication Date:
08/05/1947
Filing Date:
12/19/1944
Assignee:
Weaver, Edgar R.
Primary Class:
Other Classes:
49/118
International Classes:
E05F15/14; E05F17/00
View Patent Images:
US Patent References:
1960860Sliding door1934-05-29
1534210Operating mechanism for elevator doors1925-04-21
1085071N/A1914-01-20
1082129N/A1913-12-23
0832010N/A1906-09-25



Description:

The invention described herein may be manufactured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

This invention relates to closure operators and particularly to power operators for large hangar doors and the like, and among other objects, aims to provide a simple, practicable, and dependable power-actuated mechanism for closing and opening the panels or sections of hangar doors, the arrangement being such that the door sections reach the fully open or fully closed positions simultaneously, although each door section travels a different distance. Particular objects are to provide a door-operating mechanism which has a very easy action and is so made that it is accessible for maintenance and repairs, with no parts projecting externally of the door sections to be exposed to the weather, and all parts being above the floor level so that damage from passing vehicles, etc., is improbable. Other objects will be understood from the following description of the preferred embodiment of the invention shown in the accompanying drawings forming a part of this specification.

In said drawings: Fig. 1 is a fragmentary diagrammatic view, in perspective, of a three-section hangar door and the operating means therefor; Pig. 2 is an elevation, on a greatly reduced scale, of two hangar doors of three sections each, shown in closed position; Fig. 3 is a fragmentary plan view showing the operating mechanism in the hangar alcove and its connections with the door sections, which are shown only fragmentarily; Fig. 4 is a vertical section substantially on line 4-4 of Fig. 3; Fig. 5 is a vertical section substantially on line 5-5 of Fig. 3; Fig. 6 is a detail elevation showing a typical adjustable connection between a sprocket chain and a door section; Fig. 7 is a detail in vertical cross section showing the preferred way of guiding the door sections; and Fig. 8 is a detail in vertical cross section showing the preferred way of supporting the door sections.

The prior art contains a number of suggestions for operating rolling doors in such a way that the door sections or panels all reach the fully open or fully closed positions at the same time. J. F.

Murphy in Patent No. 1,005,281, dated October 10, 1911, discloses an elevator door composed of two rolling sections, one of which is pushed open or shut by hand and which has a rack and pinion connection with the other door section to effect simultaneous movement of the latter in the same direction. The Griffith and Dodds Patent No.

1,534,210, dated April 21, 1925, discloses another hand-operated elevator door, this time of three sections, all of which travel together though at appropriately different speeds. K. R. Nisbet in Patent No. 2,174,524, dated October 3, 1939, shows a hangar closed by two doors each consisting of four rolling door panels, 'with a single motor drive for a plurality of cables and differential sheaves to effect simultaneous and differential movement of the eight door panels; but there are many objections to this construction arising from operational difficulties inherent in employing cables to move heavy masses located considerable distances from the motor drive. These patents and others in the prior art fail to show how to solve satisfactorily the problem of moving very heavy and large door sections, for example around 18-20 tons, approximately 60 ft. tall and 28-30 ft. wide, through varying distances up to 85 ft. or more, in such a way as to effect simultaneous opening and closing of all the door sections.

Referring particularly to the drawings, as shown in Figs. 2 and 3, the doors are each of three disalined sections, leaves or panels I , 12, and 13, each section being upright and parallel to the others. To distinguish between the door panels, the one which is outermost, designated I1, may be called the "jamb leaf," the intermediate one, designated 12, may be termed the "intermediate leaf," and the innermost panel 13 may be called the "remaining" or "innermost leaf." These door sections are preferably built principally from standard channels, angles, and I-beams in a manner unnecessary to disclose, and may contain windows 14 at intervals. An emergency door 15 may be provided in one of the door sections 12 to permit personnel to pass in and out of the hangar without moving the large door sections.

Each door section is preferably supported by means of flanged rollers 16 (Fig. 8) rolling over a level rail 17 embedded in a solid concrete foundation 18, and is guided during its travel by a pair of horizontal rollers 19 (Fig. 7) engageable with the vertical web 20 of one of two beams 21 which extend across the top of the opening in the building which is to be closed by the door sections. Flexible weather strips 22 at the bottom of each door section niay engage the floor to shut out drafts, etc., and similar strips 23 at the top of each door section may engage one of the webs 20 to perform the same function at the top of the opening. Weather strips (not shown) are also at the inner and outer edges of each door section. No claim is made to the construction as so far described.

The preferred motor drive for each door consisting of two or more sections is located in an alcove 24 of the hangar adjacent the entrance which is closed by the doors, and comprises a reversible 2-speed electric motor 25 driving a shaft 26 which is coupled to a fluid drive or hydraulic coupling unit 2-1. A speed reducing unit Z8 is driven by the fluid unit, and slowly drives a sprocket wheel 29 about which a horizontal sprocket chain 30 is trained. Chain 30 also passes, around an idler sprocket 31 supported on a bearing fixed to a wall and is supported for the greater part of its length on a bracket 31a, fixed to a wall or other support. A bracket 32 is secured by means of a tension take-up or adjusting. device 33 to both ends of chain 30, (upper length) and is fixed to the end of door panel I I so that the latter is rolled back and.forth as the motor is driven in opposite directions. If desired: a solenoid brake 34 may be employed to effect quick stopping of sprocket wheel 29,and chain 30.

A hand-operated gear shift lever 35 operates a gear (not shown) for connecting a hand crank 37, working through spur gears 38 (which are then in mesh) to permit manual operation of the doors in case of power failure. Push button control, limit switches, and safety switches are preferably employed, but these control devices are, so well known in various arts that illustration thereof is omitted, except that one limit switch 39 is shown in Figs. 3 and 4 by way of example.

Rigidly supported adjacent the floor of the alcove is a horizontal rack 40 whose length is about equal the width of a door. section. Rack 40 lies between door section II and the wall of the alcove. A pinion 41 is fixed to a stub shaft 42 journalled in a bracket 43 fixed to and projecting from door section I, and said pinion meshes with rack 40, so that as door section 11 travels, pinion 41 is rotated by engagement with the stationary rack, causing stub shaft 42 to be rotated. Stub shaft 42 carries a sprocket wheel 43' on the opposite side of door section II, and the pitch of said sprocket wheel equals the pitch of pinion 41. A sprocket chain 44 engages with sprocket 43- to be driven thereby, and is carried on horizontal supports 44a which are secured:to door section I on the inside thereof near the bottom. The ends of sprocket chain 44Ware secured to the inner end of door section 12 by means of a bracket 45. Chain 44-also is trained about an idler sprocket 46 supported on door section II on the inside, near the bottom. A second rack 47 is fixed to door section II on the inside, perhaps 8 ft. above the floor level, and extends.hprizontally. A pinion 48, on a stub shaft 49 (journalled in bracket 50 on the inner end: o:fdoor section 12) meshes with rack 47, so as to-be erotated when there is relative movement between the door sections I1 and 12. Stub shaft:49-carries a sprocket wheel 51 at its opposite, end, and here again, the pitch of sprocket wheel 5J equals. the pitch of pinion 48. A third sprocket chain 52 is trained about sprocket wheel 51 and is sup:ported horizontally on supports 53 fixed to doorsection 12 on the inside, the third chain- 52 having an idler sprocket 54 rotatably mounted adjacent the outer end of door section 12. The ends of the third sprocket chain are secured to opposite sides of a bracket 55 fixed to door section 13 on the inner end thereof.

The operator presses the button for the desired direction of movement and the motor is energized,; starting at slow speed and automatically rising, to high speed. The main drive shaft 26 starts to rotate, which drives sprocket chain 30tin one direction or the other, moving door section- i in the same direction. As door section I I rolls,pinion 41 at the inner edge of door section II rolls over fixed rack 40 in the alcove, which rotates stub shaft 42, which in turn rotates sprocket 41. Sprocket 43 drives, sprocket chain 44 in the. same direction that sprocket chain' 30 moves, and at the same speed. Now sprocket chain 44 5. is secured at its ends to door section 12, and the latter must travel with chain 44. Since door section- 12 moves- relative to door section II, pinion 48 rotates as it travels over rack 47 on door section II, thereby rotating stub shaft 49, L@. which- in- turn drives sprocket wheel 51. Hence sprocket:chain 52 is driven in one direction or the other, and as its ends are secured to door section I3i the, latter is: rolled open or shut as the case may be, Because- the door sections are mechanically connected together, if one moves, all three move, and all three door sections attain, their final positions (whether open or closed) simultaneously; The first door section need only move a distance equal to its own width- (preferably slightly less), the- second door section moves a distance: practically double its own width, and the third: door section moves nearly three- times its own width; all in.the same time interval. The extent of- movement:of the first door section determines the total travel of each of the other doors,, and: the several movements will always be in the ratio of 1:2:3.

It: will be appreciated that door section II rolls at.a speed-which-equals the:linear speed:of sprocket chain 30, which for the sake of the discussion may be.: said, to. be 50: ft; per, min. As door section 11 - travels;. it: carries sprocket chain 44- and rack 4-7 with it;. But-sprocket chain 44; besides traveling- as- an entirety on door section- 11, is forced toe move about- its- sprockets- because stub shaft-. 42 is rotated: during. travel of pinion 41 over rack: 40: Now-the linear speed of pinion 41 is added t to:thespeed. of travel of sprocket chain 44:imparted by the door section-which supports.it; thus sprocket chain: 44- travels twice as fast' as door section 1I, or 100 ft. per;min. Door section 12 is attached.to: sprocket chain 44, hence the ground speed: of door: section 12; will be 100 ft. per min. Sprocket chain 52:is-carried on door sec4tion 12, and- will likewise- have a ground speed of 10.0cft p.er min. As pinion 48:meshes with rack 47 on door section I, the relative -speed of doors II and. I- is .imparted, to stub shaft 498 which drives, sprocket- chain. 52. Therefore sprocket chain 52: has the linear velocity of door II plus that of door section, 12-or. 150 ft: per min., and as door:section. 13 is secured to sprocket chain 52, door section 13 has a ground speed of 150'ft. per mi . In an. actual. installation which has..been found satisfactory, door section I :has a ground speed of about 17 ft. per min., moving from. fully open to: fully: closed position in: 1 min. 40::sec: Movement of the door sections .ceases when the oper.aor- removes his: finger: from. the: push button::or-when. a Jlimit switch has been tripped.

The foregoing description will make it clear that.the-invention-amay be:used on doors having almost any number of. panels or sections. A particular advantage of the invention is that the dooaqrdoQnot get out of time relative to each other, becaeuse, the, driveýis: positive. Once the drive mechanism :is;;adjuated, practically no more atten.tion.is.:,nedededas there care no; cables whichwill ncotinueJto, stretch.. Furthermore the dead Weights :of, the-: doors- arei not :imposed.on any part,) of.:th: operatixngi mechanism.; The invention:-is notýonlyLuseful for -hangar doors,. but may have-other:applications,. for instance, at motor freight termimals,;-at garages and in auditoriums, gymnasiums and-:public halls where the interior. is subdivided by movable panels or doors. Therefore I do not wish to be limited to the details described herein but only as required by the appended claims.

What I claim is: 1. A door including a pair of disalined leaves slidable in their planes between doorway-opening positions in overlying retracted relationship to each other and doorway-closing positions in projected relationship to each other, a fixed rack, a pinion on one of said leaves engaged with said rack, a sprocket wheel fixed with respect to said pinion for rotation therewith, an idler sprocket wheel on the same leaf, an endless chain engaged with said sprocket wheels, and a connection between said chain and said second mentioned leaf whereby said leaves are shifted between retracted and projected positions relative to each other by shifting of either leaf between doorway-opening and doorway-closing positions.

2. A door including an outermost or jamb leaf and at least two other leaves all disalined and slidable in their planes between doorway-opening positions in overlying retracted relationship to each other and doorway-closing positions in projected relationship to each other, a fixed rack, a pinion on said jamb leaf engaged with said fixed rack, a sprocket wheel fixed with respect to said pinion for rotation therewith, an idler sprocket wheel carried by said jamb-leaf, an endless chain engaged with said sprocket wheels, a connection between said chain and said intermediate leaf whereby said intermediate leaf is shifted to projected and retracted positions relative to said jamb leaf by shifting of said jamb leaf to projected and retracted positions relative to the doorway, a rack fixed to said jamb leaf, a pinion on the intermediate leaf engaged with the rack on said jamb leaf, a sprocket wheel fixed with respect to said second mentioned pinion for rotation therewith, an idler sprocket on said intermediate leaf, an endless chain engaged with the sprockets on said intermediate leaf, and a connection between said last mentioned chain and said remaining leaf whereby said remaining leaf is projected and retracted relative to said intermediate leaf by projection and retraction of said intermediate leaf relative to said jamb leaf.

3. A hangar door comprising first and second hangar door sections, means supporting the door sections for rolling movement in adjacent parallel vertical planes between fully open and fully closed positions, means for simultaneously operating the door sections comprising a stationary horizontal rack disposed parallel to the direction of movement of the first door section, a pinion meshing with said stationary rack, a shaft supporting the pinion in driving relation thereto, means journalling said shaft on the first door section, a sprocket on the first door section driven by the shaft, a sprocket chain driven by the sprocket, means operatively supporting said sprocket chain on the first door section for relative movement in a direction parallel to the direction of movement of the first hangar door section, and means connecting the second door section to the sprocket chain, the mechanism being so proportioned, constructed and arranged that the first and second door sections reach their limits of rolling movement in either direction simultaneously.

4. Apparatus as claimed in claim 3, including a third hangar door section mounted to roll parallel to the first and second hangar door sections, a second horizontal rack rigidly supported on the first hangar door section at one side thereof adjacent the second hangar door section, a second shaft journalled on the second hangar door section, a pinion fixed on said second shaft in meshing relation with said second horizontal rack, a second sprocket fixed on said second shaft adjacent the third, hangar door, a second sprocket chain driven by the second sprocket, means supporting the second sprocket chain on the second hangar door section in adjacent parallel relation to the third hangar door section for relative movement in a direction parallel to the rolling movements of the second hangar door section, and means connecting the third hangar door section to the second sprocket chain, the pitch of each pinion being equal to the pitch of the sprocket which is directly driven by it.

5. A door operating mechanism for multi-section rolling doors comprising, a plurality of rolling door panels movable in adjacent parallel vertical planes, a shaft, means connecting the shaft with a first one of the door panels for opening and closing movements of that door panel, a pinion journalled on said first door panel to rotate about a horizontal axis disposed transverse to the plane of rolling movement of said first door panel, a stationary rack meshing with said pinion to rotate said pinion as said first panel is moved to open or closed positions, a sprocket connected to said pinion to rotate therewith, an endless sprocket chain supported on said first door panel for relative movement in a plane parallel and adjacent to the first and a second one of the door panels having an upper side disposed horizontally and parallel to the plane of the second door panel and in driving relation with said sprocket, means connecting the upper side of said sprocket chain with the second door panel, a second rack mounted horizontally on the first door panel, a second pinion journalled on the second door panel meshing with the second rack, a second sprocket connected to the second pinion to be rotated thereby, a second endless sprocket chain supported on the second door section in a plane parallel to the plane of rolling movement of the second and a third one of the door panels having an upper side disposed parallel and adjacent to the second and third door panels, and means securing the said upper side of the said second sprocket chain to the third door panel, whereby the first, second and third door panels move simultaneously between full open and closed positions and reach fully open or fully closed positions simultaneously. 60 EDGAR R. WEAVER.

REFERENCES CITED The following references are of record in the file of this patent: 65 UNITED STATES PATENTS Number 1,085,071 1,960,860 1,534,210 1,082,129 832,010 Name Date Voight -----------Jan. 20, 1914 Allen ----------- May 29, 1934 Griffith et al. ----- Apr. 21, 1925 McCabe _---_-- - Dec. 23, 1913 Cossey ------------ Sept. 25, 1906