Operator shall be built into a compact unit mounted on a heavy steel base. Each unit shall consist of a right angle gearhead reversing motor, magnetic brake, safety disc clutch, NEMA rated starter with silver to silver contacts, and a chain driven, NEMA rated, geared type automatic limit switch. The gearhead motor and magnetic unibrake shall be assembled as one unit with one stage of reduction. The gear motor housing shall be of all cast iron construction. Worms shall be rolled from solid blanks of high alloy 8620 steel. Worms receive polishing treatment to maximize efficiency. Seal contact area is super finished. Output shafts of "stressproof" 1045 alloy, minimum 100,000 psi yield, shall be mounted on heavy duty tapered roller bearings. Double lip oil seals on the output shaft shall operate on super finished shaft areas to assure oil retention and contaminant exclusion. The magnetic brake with its easily adjustable feature shall be assembled to the motor to make a compact and efficient unit. The automatic limit switch, stops the doors in the fully open or closed position, shall be the precision built gear type which is to be operated with a chain drive from the counter shaft of the gearhead motor. The door shall be driven with high quality self-adjusting No. 52 roller chain with a minimum ultimate strength of 6100 lbs. attached with heavy brackets to the door. A simple releasing feature shall be supplied in case of power failure. The chain shall be driven from a heavy duty dependable safety friction disc clutch on the gearhead motor's counter shaft. This safety clutch shall protect equipment in case the door comes in contact with an obstruction. The door speed shall be 45 FPM. Current shall be 208/220/ 3 phase, 60 htz.
The operator shall be protected by a weather cover.
Guarantee: There shall be a warranty of 1 year after installation. THE WARRANTY DOES NOT LIMIT THE NUMBER OF GATE CYCLES PER HOUR.
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