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Nov. 19, 1946.
2,41 1,369 '
Filed Aug. 12. 1943
2 Sheets-She'et 1
Nov. 19, 1946.
_ Filed Aug. '12. 194:5
2 Sheets-Sheet 2
36 39
I- 19
Iraven/Z01" '
Patented Nov. 19, 1946
' 2,411,369
Victor E. Forrest, Minneapolis, Minn.
I Application August 12, 1943, Serial No. 498,308
5 Claims. (CI. 20-19)
This invention relates to door constructions
and more particularly to vertically movable doors
which are especially adapted for use to close wide
door openings on buildings such as aircraft
Difficulty has been encountered with large
-ramp 1. Fig. -1 shows a pair of hangar side. walls
8 and-9 and front wall portions Ill and II,
A door panel l2 extends entirely across the-door
opening'between the front wall portions; l0 and
i I. The upper end of the door I2 is provided with
a plurality of spaced brackets l3, as shown in Fig.‘
5. The brackets I3 carry rollers it which ride in
doors such as hangar doors, since their size makes
it difficult to apply equalized forces thereto at
trackways I5, said trackways extending between
numerous points for smooth and even opening
a. transversely disposed member’l? adjacent the
and closing operations. As a result these doors io upper edge of the door and a r'earwardly disposed
are frequently made in sections with each section
horizontal anchoring member H which is sus
" operable separate from the others.
pended from a plurality of rearwardly extending
It is a general object of my invention to provide
I beams l8.
, a door construction particularly adaptable for
Rearwardly of the trackway anchoring mem
use on aircraft hangars wherein the entire door 15 ber ii is an anchoring strap it which has ‘sus
can be made in one piece and it can be readily
pended therefrom a plurality of spaced pairs of
swung up to an open position adjacent the top
brackets 20. Pivotally secured between each pair
‘ of the door opening without binding or twisting.
Another object of the invention is to provide
of brackets 29 is one end of a strut member 2|
which extends forwardly and downwardly to ply.
improved bracing means for the door which will 20 otally connect with a bracket 22 secured to the
hold it rigidly against high ‘winds and which is . inner side of the door it?_ at a point vertically in
so arranged that a relatively light door panel can '
be substituted for the. comparatively heavy and
cumbersome panels which have heretofore been
found necessary.
A more speci?c object of the invention is to
provide a collapsible door bracing structure which
is made up of a plurality of collapsible units con
nected along the door in horizontally spaced rela
tionship together with means for simultaneously
collapsing the bracingtunits so that there are no
unequal stresses placed upon the door or the
bracing structure.
termediate the ends of said door and approxi
mately at the center thereof. Intermediate the
ends of each strut 2! is a bearing 21’! which ro
tatably supports a rod 2d, said rod extending par
allel to said door and rearwardly thereof. Keyed
, to the rod as by a key member 25 shown in Fig. 4
' is a pair of brace arms 26 whose opposite ends
are pivotally connected to a brace arm 21, said
30 arms‘ 26 and 21 providing a jointed brace unit.
The arm 21 is pivotally connected to a bracket
28 which is mounted on the door I2 near the
upper edge thereof. ‘Where the brace arms 26
pivotally connect with the brace arm 21 is a stop
These and other objects and advantages of the
invention will more fully appear from the follow 35 member 29 permitting the brace unit to break
ing description madein connection with the ac
only in one direction. It is, of course, understood
companying drawings, wherein like reference
characters refer to the same parts throughout the
that there is a brace unit made up of the arms
25 and 21 for each of the strut members‘Zl and
that these units are positioned at spaced intervals
Fig. 1 is a fragmentary rear elevation of a door 40 across the width of thedoor It‘.
views, and, in which:
equipped with my ‘bracing and operating appa
Fig. 2 is a fragmentary plan view or the'brac
The shaft 2i carries a, pulley 30 around which
is extended a belt or chain 3| which runs to a
pulley 32 on the stub shaft 33 of the strut 2|.
The shaft 33 also accommodates a. hand oper
. of the power actuating mechanism;
45 ated chain 34 which can be used to rotate shaft
Fig. 3 is a transverse vertical section through
33 and pulley 30 to partially rotate the shaft 24
the door showing one bracing unit and the Power - ' and break the joint of the brace unit 26, 21.
ing structure at one end of the door and
mechanism in side elevation;
Fig. 4 is an enlarged fragmentary detailQof a
Mounted above and lateraliy of the right-hand .
side of the door as viewed in Fig. 1 is a motor
_ portion of the collapsible bracing structure; and 50 35 having a worm shaft 36 meshing with a worm
r Fig. 5 is a fragmentary view partially in section
gear 31 on a shaft 38. The shaft 38 carries a'
of a portion of the door and one of the
winding drum 39 and uponthis drum is wound a
we .
' trackways.
' In Fig. 3 there is shown a hanger floor 6, the
forward edge of which Joins an inclined entran'ce
cable 40. . The cable extends from the drum 39
" about ya pulley 4| which is mounted on a vertical
axis, and the cable then extends across the width
The entire structure is relatively simple, but
of the door and above the upper edge thereof on
a series of pulleys 42. As shown in Fig. 1, the
cable 40 extends entirely across the door and at
intermediate points along the door are branch
- cables 43 which connect with the main cable 40
so that when said cable 40 is wound on the drum
39 the branch‘ cables 43 ,will also be drawn to
ward the drum 39. The end of the cable 40 and
the lower ends of the branch cables 43 are con-.
it is so synchronized that there is uniform force
applied at all points along the door but at the
same time the bracing structure is such ‘that a
relatively light door panel can be used with safety.
_ With the construction wide hangar doors can be
constructed in a single unit, thus greatly simpli
. fying door actuation as compared to doors which
are formed in a multiplicity of. units which are
nected to the outer side of the door l2 as-shown 10 actuated separately, although ‘of course, the
structure can be articulatedif such an arrange- 3
at 44 in Fig. 3, this point of connection being a
ment is desired.
considerable distance down from the upper edge
It will, of course, be understood that various
of said door l2 and preferably at a point near
changes may be made in the form, details, ar
the vertical center of said door l2.
'In the event of failure of the motor 35 and the 15 rangement and proportions of the various parts
without departing from the scope of my inven
cables 40 and 43 can be drawn toward the drum
“by means of a hand operated endless chain
What I claim is:
45 which extends about a sprocket 46 on the end
l._ In a vertically movable door construction,
of the motor driven shaft 38 upon which the drum
20 a door panel, a stationary‘memb'er spaced from,
39 is also mounted.
an upper side of said door, a strut having its ends
‘ In order to counterbalance the weight of the
pivotally connected to a vertically intermediate Q
.door l2 and relieve the motor 35 of excessive
portion of said door and to ‘said stationarymem
loads I'provide a counterweight 41 which is sus
» pended from a cable 48, said cable also being
_ her, a jointed brace connected to said door and
is raised and lowered the counterweight 4'!v moves
vertically and oppositely to the door l2 to pro
jointed brace having a locked position and a
wound about the drum 39. Thus when the door 25 to an intermediate portionof said strut, said
vide substantial balance therefor.
When the door is closed the bracing structurev
is in the full line position shown in Fig. 3. In 30
this position the strut 2| in combination with
the joint brace unit 26, 21 provides rigid bracing
broken position, and means connected to said
brace for breaking the same from its“ locked po
2. In a vertically movable door construction, a
door panel,.a stationary anchoring means spaced ,
from an upper side of said door,'a plurality of
struts having their ends pivotally connected to
means for said door against any forces tending
to push the door inwardly. Furthermore, vthe . vertically intermediate portions of said door and
lower edge of the door is positioned against the 35 to said stationary anchoring means, said points
of connection with said door and said anchoring
edge of the floor 6 where it meets the ramp 1.
means being in alignment, a plurality of jointed
Thus any strong winds directed against the door
braces connected to.said door and to intermediate 3
cannot injure. it or push it inwardly. When the
portions of said struts, and a common joint break
door is to be opened the endless chain 34 is pulled
to rotate shaft 33 and pulley 30 with the resulting 49 ing means connected to said jointed braces and
operable to break said joints simultaneously.
rotation or partial rotation of the shaft 24 which
is keyed to the arm 28 of the jointed brace unit
breaking means comprising a shaft connected/to
26, 21. Rotation of the shaft 33 and pulley 30
a portion of each of said jointed braces for move
in a clockwise direction and the brace unit 26, 21
will, therefore, break with its central pivot mov 45 ment therewith, wherebyrotation of said shaft
ing upwardly. This draws the top of the door
inwardly or to the right, as shown in Fig. 3. The
will break all of said joints together.
4. In a vertically movable door construction, a
door panel, a stationary member spaced from
rollers I4 move to the right in the trackways IS.
an upper side of said door, a strut having its ends
The motor 35 is then operated to rotate the drum
39 and partially wind the cable 40 on said drum. 50 pivotally connected to a vertically intermediate
portion of said door and said stationary member,
This also, of course, creates a pull on the branch
a collapsible brace connected to said door and
' cables 43 and the door will be raised, the ‘top
to an intermediate portion of said strut, and a
edge of the door moving rearwardlyt and the bot
pair of spaced, substantially horizontally disposed
tom edge of the door swinging upwardly and out
wardly until the door reaches the dotted line po 55 trackways extending laterally relative to the
upper edge of said door, and track followers se
sition shown in Fig. 3. The dooris then in an
cured to said door at its upper edge and movable
overhead position entirely out of the way and the
in said trackways.
entire door opening is free. ‘At the same time
5. In a vertically movable door construction, a
the cables 40 and 43 exert an upward pull on the
panel movable to ‘open and closed positions,
door from an intermediate portion thereof the 60
a stationary member spaced horizontally from
counterweight '41 moves downwardly as its sup
the plane of said door. a strut having its ends
porting cable 49 unwinds from the drum 39. The
pivotally connected to said door‘and said station,
counterweight, therefore, substantially balances
ary member, a jointed brace having ?xed pivotal
the weight of the door l2 so that the motor 35 is
not subjected to any great load. Of course, When 65 connections with said door and an intermediate
portion of said strut, and said ‘strut being posi
the door is lowered the counterweight similarly
tioned to swing said door from one plane to an
balances the door I! so the door will not drop
other and toward a horizontal position when said’
too fast.
door is moved from its closed to its open position.
By having the jointed brace arms 26 keyed to
the shaft 24 which extends across in back of the 70
vrc'ron E. FORREST.
‘door all of'the joints are broken simultaneously
and there is no undue twisting strain on said
shaft 24 nor upon opposite ends of the door I2.
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