Vertical Lift Mobile

Vertical Lift
Flexibility:
Our vertical lift hangar door systems are
available in many configurations to meet
your specific requirements. Having built
vertical lift door systems over 30' tall and
over 130 feet in width, with wind loads
(while closed) up to 200mph, we are
confident that we can build a system that
will meet your requirements or your
imagination.

Design:
Doors are designed using CAD and
structural engineering sotware. Door
frame structure and connection designs
are certified by an independant engineer.
Door frames are engineered using
structural steel and cold formed memebrs
per AISC and AISI codes. Wind loads are
calculated using your location and
building size for the most accurate
structural loading possible. We don't
make an assumption on the wind load by
using an arbitrary standard, we check
every time.

Construction:
Door components are manufactured to
the highest standards and designed to be
completely bolt together, avoiding costly
delays due to welding inspections and
the availability of certified welders in the
field. Door components are also
designed to have as few connections as
possible, simplifying and increasing
assembly speed on the job. This lowers
the total installed cost for your door
system.

Lift System:
There are three systems available for
lifting. The premiere design we use for
lifting doors is the hydraulic lifting unit. By
utilizing a hydraulic cylinder to control
door movement a large safety factor is
gained. Hydraulic fail safe valves are
used to lock the cylinder in place if a
control valve should fail or a hydraulic line
is ruptured or damaged. (We became
real believers in this system and the
components we use after another
company's careless employee ran a
piece of equipment into the hydraulic
lines of a large canopy door while the
door was open and construction
personnel were working directly
underneath it. Other than some hydraulic
oil that spilled out of the broken pipe
there was no further damage to the door
system and more imporantly the door
didn't fall. So no one got hurt, or worse.
This particular door weighs over 14,000
lbs. After settling about 1", which is the
fluid volume necessary to activate the fail
safe valve, the door maintained it's
position for over a week before we were
contacted and repairs could be made).
The closing speed can be easily tuned by
adjusting the factory installed speed
control valve. The lifting winch system
offers simplicity in design and installation.
The lifting winches are directly mounted
to the door frame, so no lift unit is
necessary. No pulleys need to be added
to the building and no compressive force
is exterted on the header. All this adds up
to very few moving parts, which equates
to lower maintenance costs over the life
of the door. The third lift system available
is the tried and true counterweight
system. The counterweight system has
been used on countless doors for as long
as doors have been built. The main
drawback with this system is the space
required for the counterweight tower and
the cost of the counterweight material.

Supporting Cables:
Vertical Lift doors are supported by
galvanized cables using a safety factor of
at least 5-1, stainless steel cables
available upon request.

Fall Restraint Safety System:
We install our fall restraint safety system
on every vertical lift door we manufacture.
This sytem uses a spring loaded pin to
arrest door movement if the lifting
cable(s) lose tension. The pins are rated
for 1.5 times the weight of the door panel
to account for the increased energy of the
door panel as it begins to fall. The
maximum amount the door can fall under
complete lifting cable failure is 12". This
spacing can be reduced if required, 12"
from support block to support block is
standard. This design was submitted and
approved by the Army Corp of Engineers
for use on a large vertical lift doors we
built for the U.S. Airforce. A
demonstration video was made at our
facility with the engineers present while
we disconnected the lifting cables on our
vertical lift door in the rear of our shop.

Door Supporting System:
The cables are supported by solid steel
pulleys that are machined in house and
installed with roller bearings for a long
service life. Pulley axles are drilled and
tapped for grease fittings for ease of
maintenance.

Weatherstrip:
Weatherstrip is 1/8" cloth inserted epdm.
Weatherstrip meets military
specifications for durometer, UV
resistance and incidental exposure to
paint thinners. Retainer bar is fastened by
zinc coated self drilling screws every 8"
for a secure seal without oil canning of
retainer bar. Retainer bar is easily
removed for replacement of
weatherstripping if it becomes
necessary. Leading edge bubble seals
alow for 4" of compression.

Electrical Controls:
Door control panels are manufactured in
house using only the highest quality UL
listed components. Door control systems
utilize electromechanical relays that are
highly resistant to electrical interference
and have no programming that can
become corrupted requiring service.
Door control systems also utilize solid
state proximity sensors for limiting door
travel. These sensors are water proof and
have no moving parts to wear out. Door
control systems can be supplied ranging
from 12VDC to 600VAC. Variable
frequency drives are available for custom
tuning or varying of door operating
speed. Variable frequency drives come
with variable speed buttons with 3
adjustable speed settings standard, 5
speeds as an option.

Standard options:
Timer delay with safety noisemaker
and/or strobe light, safety edge with delay
and/or auto reverse, personnel door
frames and safety interlock sensors,
explosion proof drive system, air drive
operating system, hydraulic drive
operating system, 12VDC backup
hydraulic pump system, engine driven
backup hydraulic pump system. Door
drive motors and control panels are fully
assembled, wired and tested at our
facility prior to shipping.

Please call with your custom option
requirements, we are here to create the
system that meets your needs and your
imagination.