shall be vertically adjustable. Construct wheel assemblies to permit
removal of the wheel without removing the door leaf from its position on
the rail.
a.
Treads: Machine wheel treads concentric with bearing seats. The
clear distance between flanges shall not exceed the width of the
rail by more than 3 mm 1/8 inch at the tread nor more than 6 mm
1/4 inch at the edge of the flange. Machine internal bearing
seats accurately for a press fit. Heat treat wheels 450 mm 18
inches or greater in diameter to obtain a rim hardness of 320
Brinnel.
b.
Wheel bearings: Provide tapered roller or spherical bearings,
either internal or cartridge type, arranged so that both
horizontal and vertical loads shall be transferred to the rail
only through the bearing. Bearings shall be tightly sealed and
equipped with high-pressure grease fittings.
2.1.8.2
Fixed Pancake Top Guide Rollers
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NOTE: Specify stainless steel rollers only if local
experience indicates that steel rollers will rust
and interfere with door operation.
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Horizontal type; each with single or double steel rollers of a suitable
diameter and thickness for satisfactory performance under the designated
load conditions and top guide system used. Provide permanently lubricated
bearings. [Rollers shall be stainless steel.]
2.1.8.3
Vertical Floating Head Top Guide Rollers
Provide top-roller assemblies to:
a.
Move up and down within the specified live load positive and
negative deflection of the roof in the vicinity of the door
opening;
b.
Allow easy removal through the top of the guide system; and
c.
Include both horizontal and vertical rollers built into a frame
which is connected in such a manner as to transmit the specified
wind loads from the door to the hangar structure and to prevent
disengagement of the door from the top guide.
[Rollers shall be stainless steel.]
2.1.9
Personnel Doors
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NOTE: Personnel doors, their frames, and hardware
shall be specified in the respective sections of the
project specification. Provide self closing door
hardware.
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The hangar door manufacturer shall provide structural frames and electrical
interlock for personnel doors.
SECTION 08342
Page 12
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