Theatre Design & Technology - Summer 1986 - 19

......................................................

Sealing Mechanism
A manually operated crank handle,
three feet above floor level, is used to
seal and unseal the huge door. The
handle fits into a right angle, linear
screw "jack" which engages a bell
crank. This rotates the torque tubes, or
tubular columns, causing the cam rollers to engage the front face of the door.
That action pushes the door against the
frame to provide the desired compression seal. The hand crank is simply reversed to disengage the door from the
frame. A few revolutions of the handle
will seal or unseal the door.
De pite its weight of nearly 4.5 tons
and its sealing mechanism, the door can
be opened and closed by one person. It
travels smoothly, suspended by lowfriction roller bearing trolleys from an
overhead I-beam track. Two parallel
handles on the face of the door, located
at a height of 36 inches from floor level,
allow anyone to open or close the door
at comfortable walking speed. After
the door is unsealed, a force of less than
50 Ibs. is required to push the door open
or closed. A buffer is positioned at both
ends of door travel. Mounted on the
left side of the wall, is a rubber bumper
to stop the door when it is opened.
Another bumper on the right cushions
the door when it is closed.
For both strength and sound sealing
purposes, the wood casing door frame
is clad with 26 gao galvanized steel at the
head and both sides. These casing are
mounted on 6", 8.2 Ibs.-per-linear-ft.
steel channel frame. All door hardware
has a corrosion protected finish. Special care was exercised by the contractor
to make sure that the entire header assembly, sill, channel and casings were
installed plumb, true, and square since
the slightest discrepancy in installation
could ad\usely affect the sound seal.
Since its installation in 1983, the
sound reduction door has performed
\\·ell. and \\'ith minimum maintenance.
Set hop per onnel do nothing more
than clean the shop dust out of the trolley track.

Frederick Jerant is a public relations
writer.

*

WALL LINE

DOOR HANGER
ASSEMBLY

6C8-2

CHANNEL FRAME

@
HEAD CASING

STC47
DOOR PANEL ..

DOUBLE ROW GASKETING

The soulld door is suspellded from a trolle.l· that glides slllOoth/l"
lI'hell the door is opelled alld closed.
CSITT

011

steel/-beam track

ummer Il)~(i Thratrr Dr,ign & Trchnolog)

II



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1986

Contents
Theatre Design & Technology - Summer 1986 - 1
Theatre Design & Technology - Summer 1986 - 2
Theatre Design & Technology - Summer 1986 - 3
Theatre Design & Technology - Summer 1986 - Contents
Theatre Design & Technology - Summer 1986 - 5
Theatre Design & Technology - Summer 1986 - 6
Theatre Design & Technology - Summer 1986 - 7
Theatre Design & Technology - Summer 1986 - 8
Theatre Design & Technology - Summer 1986 - 9
Theatre Design & Technology - Summer 1986 - 10
Theatre Design & Technology - Summer 1986 - 11
Theatre Design & Technology - Summer 1986 - 12
Theatre Design & Technology - Summer 1986 - 13
Theatre Design & Technology - Summer 1986 - 14
Theatre Design & Technology - Summer 1986 - 15
Theatre Design & Technology - Summer 1986 - 16
Theatre Design & Technology - Summer 1986 - 17
Theatre Design & Technology - Summer 1986 - 18
Theatre Design & Technology - Summer 1986 - 19
Theatre Design & Technology - Summer 1986 - 20
Theatre Design & Technology - Summer 1986 - 21
Theatre Design & Technology - Summer 1986 - 22
Theatre Design & Technology - Summer 1986 - 23
Theatre Design & Technology - Summer 1986 - 24
Theatre Design & Technology - Summer 1986 - 25
Theatre Design & Technology - Summer 1986 - 26
Theatre Design & Technology - Summer 1986 - 27
Theatre Design & Technology - Summer 1986 - 28
Theatre Design & Technology - Summer 1986 - 29
Theatre Design & Technology - Summer 1986 - 30
Theatre Design & Technology - Summer 1986 - 31
Theatre Design & Technology - Summer 1986 - 32
Theatre Design & Technology - Summer 1986 - 33
Theatre Design & Technology - Summer 1986 - 34
Theatre Design & Technology - Summer 1986 - 35
Theatre Design & Technology - Summer 1986 - 36
Theatre Design & Technology - Summer 1986 - 37
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Theatre Design & Technology - Summer 1986 - 60
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