U.S. patent number 3,878,879 [Application Number 05/388,211] was granted by the patent office on 1975-04-22 for roll-up door.
This patent grant is currently assigned to Nordiska Maskinfilt Aktiebolaget. Invention is credited to Bernt Hugo Manns.
United States Patent |
3,878,879 |
Manns |
April 22, 1975 |
Roll-up door
Abstract
In a roll-up door having a flexible door-leaf arranged to be
wound about a roller for closing and opening the door, means for
maintaining said door-leaf in a stretched condition laterally, said
means including trolleys running in guide rails provided in
vertical side frames, and means for maintaining said door-leaf in a
stretched condition vertically, said means including a movable
pulley loaded by a weight, said weight being divided into two
opposing load components by a wire running from the trolley around
two stationary pulleys and over said loaded movable pulley to a
winding drum supported on the shaft of said roll-up roller.
Inventors: |
Manns; Bernt Hugo (Halmstad,
SW) |
Assignee: |
Nordiska Maskinfilt
Aktiebolaget (Halmstad, SW)
|
Family
ID: |
20292806 |
Appl.
No.: |
05/388,211 |
Filed: |
August 14, 1973 |
Foreign Application Priority Data
|
|
|
|
|
Aug 18, 1972 [SW] |
|
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10759/72 |
|
Current U.S.
Class: |
160/273.1;
160/133; 160/23.1; 160/285 |
Current CPC
Class: |
E06B
9/62 (20130101); E06B 9/58 (20130101) |
Current International
Class: |
E06B
9/58 (20060101); E06B 9/62 (20060101); E06B
9/56 (20060101); E06b 009/08 () |
Field of
Search: |
;160/23-26,133,238,266-273,284-287 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Bell; J. Karl
Claims
What I claim is:
1. An improved roll-up door including a flexible door-leaf, a
roller onto which said door is wound, first and second vertical
side frames, guide means supported by said side frames for guiding
said door during vertical movement, trolleys in said frames for
maintaining said door in stretched condition laterally, the
improvement comprising first and second pulleys, arranged in said
vertical side frames respectively, first and second weights
respectively secured to said pulleys for maintaining said flexible
door in stretched condition in the vertical direction and
simultaneously balancing said door, a groove in each of said
pulleys, first and second ropes running in said respective grooves
in each of said pulleys, first and second winding drums
respectively at the ends of said roll-up roller, and first and
second stationary pulleys in said frames, each of said ropes
arranged to divide said respective weight into two opposing load
components, one through the connection of one of the rope ends to
said respective winding drum and the other one through the
connection of the remaining rope end to said trolley via said first
and second stationary pulleys, each of said ropes being
respectively wound onto and off its respective winding drum in a
direction opposite to the winding-on and winding-off directions of
the door-leaf onto and off said roll-up roller.
2. An improved roll-up door as claimed in claim 1, wherein said
door-leaf is made from a fabric.
3. An improved roll up door as claimed in claim 2, wherein said
fabric is coated with polyvinyl chloride.
4. An improved roll-up door as claimed in claim 2, wherein said
fabric is coated with an epoxy resin.
Description
BACKGROUND OF THE INVENTION
To avoid disturbances such as air currents, noise, etc. between two
premises, e.g. factory halls, or between an indoor room and an
outdoor room, it is necessary that the interconnecting opening is
blocked off by a door or gate. The doors available on the market
are manufactured in the shape of
A. CONTINUOUS, RIGID DOOR-PANELS,
B. DIVIDED, RIGID DOOR-PANELS, THE DIVISIONS BEING HINGEDLY
INTERCONNECTED,
C. DOOR-PANELS CONSISTING OF STEEL LAMELLAE, AND
D. DOORS MADE FROM ALUMINIUM PROFILES ARRANGED TO BE TELESCOPICALLY
NESTED IN ONE ANOTHER.
A feature common to all types of doors mentioned above is that in
open condition they are collected above the door opening and
several of them require considerable headroom space vertically or
in plane above the opening. The speed of opening up the doors is
for all the door types mentioned very low and in consequence
thereof considerable hold-up time is required for internal
transports, particularly in case double doors are used including an
air lock where one door has to be shut before the second one
opens.
SUMMARY OF THE INVENTION
The roll-up door in accordance with the present invention is of the
type where the door-leaf is flexible and arranged to be wound about
a roller into open position. It is characterised in that the
door-leaf is maintained in a stretched condition laterally by means
of trolleys having preferably grooved wheels running in contact
with guide rails provided in vertical side frames. The opening and
closing movements of the door in accordance with the invention may
be performed rapidly, the door is noiseless and the space required
to accommodate the door-leaf in open positions minimal. In
accordance with one embodiment of the invention the weight of the
door-leaf may be completely balanced, making it possible to easily
operate the door manually, should this be required.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described more in detail in the following
with reference to the accompanying drawings wherein,
FIG. 1 is a front view of a roll-up door in accordance with the
invention, the door being in a semi-open position,
FIG. 2 is a side view of the door, and
FIG. 3 is a horizontal section along line III--III of FIG. 1.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
The door-leaf 1 consists of a flexible material, such as a fabric
which may be coated with polyvinyl chloride, an epoxy resin or
similar substance. The fabric must be of a kind that is
dimensionally stable laterally. Above the door opening is rotatably
mounted a roll-up roller 2 onto which the flexible door-leaf 1 may
be wound. At each one of the two lower corners of the door-leaf 1
is provided a trolley 3 having grooved wheels 4 running in contact
with guide rails 5 provided in the vertically positioned side
frames 6 of the door. These trolleys maintain the door-leaf 1 in a
stretched condition in the lateral direction. To each trolley 3 is
attached one end of a wire 7. Each wire 7 runs around stationary
pulleys 8 and 9 and over a movable pulley 11 loaded by a weight 10.
The opposite end of each wire 7 is attached to a winding drum 12
which is rigidly secured to the same shaft as in the roll-up roller
2 and onto which the respective one of the wires 7 is wound.
The wires 7 are wound off and on its respective winding drum 12 in
the opposite direction to the unwinding and rolling-on of the
door-leaf 1 onto and off the roll-up roller 2 which means that when
the door-leaf 1 is wound off (the door closes), the wires 7 will be
wound on, and the reverse for opening the door. On account of the
heaviness of the weight 10, the wires 7 will exert a downwards
pulling effect on the trolleys 3 and in doing so will maintain the
door-leaf in a stretched condition in the vertical direction. The
weight of the trolleys 3 and that of the door-leaf 1 may be
balanced through a suitable choice of diameter relations between
the roller 2 and the winding drum 12. This balancing may be carried
out in such a manner that the door, when released, may be brought
to a standstill in the position desired.
The door is driven in the conventional manner by means of a motor
13 which is coupled to the roll-up roller 2. The operation may be
effected electrically from a position which is convenient for
instance for the truck drivers, and may be effected either manually
or automatically with the aid of e.g. photoelectric cells. Owing to
the balancing a rather small power is required for the motor 13 to
effect the closing and opening movements.
* * * * *