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All windows as indicated on drawings and marked
"mechanically operated" shall be equipped with Dayton torsion lever
arm
operators as manufactured by the Dayton Metal Products Co. (937)-849-0071.
OIL ENCLOSED POWERS
Powers shall be of the oil enclosed, worm and gear
type. Worms shall be machine cut steel. Gears shall be machine cut iron. Ball
thrust bearings shall be mounted at each end of the worm stem. Housings shall
be grey iron carefully machined and fitted with gasket between lid and box to
assure a grease tight box. All powers shall be packed with sufficient grease
at the factory at the time of assembly with brackets for mounting powers to
the building construction.
OPERATING LINE
Horizontal line shall consist of steel pipe shaft to
which shall be attached malleable iron lever arms. Steel connecting arms, 1/4"
x 1", shall be provided between the ends of lever arms and clips
attached to the ventilators.
Steel pipe shaft shall be not less than 1-5/16" O.D.
standard pipe. Provide steel, roller-bearing type bracket hangers at window
mullions and at intervals not to exceed 8'-0" on centers, for the full length
of each horizontal shaft.
CONTROLS - Specify only one of the following types of control
CHAIN WHEEL CONTROL - Powers shall be fitted with chain wheels and
guards. Power shall be exerted by heavy steel, continuous chain extending from
chain wheel to within 2'-0" from floor level of the control station. Furnish
double or single idlers as may be necessary for chain to clean building
construction.
OIL ENCLOSED MITRE GEAR AND VERTICAL SHAFT CONTROL - Provide oil
enclosed type mitre gear box and vertical shaft control as indicated on the
drawings. Bevel gears shall be machine cut steel and mounted in grey iron
housing of grease tight design for direct attachment to the building
construction, approximately 4'-0" above floor level. Gear boxes shall be
packed with sufficient grease at the factory and shall be provided with
handwheels or removable cranks as directed by the architect. Vertical shaft
shall not be less than 1-5/16" O.D. standard steel pipe and shall be supported
with steel roller-bearing brackets. Provide universal joints as required to
change direction of vertical line to clear building construction. Change in
direction of vertical line shall not exceed 35 degrees at any universal joint.
DIRECT HANDWHEEL CONTROL - Provide direct handwheel control where the
powers are within easy reach from the floor or as indicated on the drawings.
Handwheel shall be attached direct to the worm stem of the power.
SHOP FINISH - All operators shall receive one shop coat of grey iron
primer at the factory.
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