Midwest Transfold Choral Risers
Risers shall consist of three, 18" deep steps with tapered ends, 8", 16" and 24" high that are permanently joined with hinged mechanisms to enable the unit to open and fold in a unitized manner. A fourth level, 32" high, add-on step may be added if desired. Each unit shall be equipped with integral wheels to facilitate transportation when folded and to allow easy positioning after the unit has been set up for use.
Risers shall be supported by tubular steel frames of 1" x 1" - 16 gauge, zinc-plated steel. Individual frame sections shall be joined with 11-gauge, knuckle type hinges, secured with five, 5/16" bolts and locking nuts.
Riser decks are to be constructed of 3/4" thick plywood, surfaced with polyolefin carpet. Decks are encased and supported by 1 13/16" high, channels of 16-gauge, powder-coated steel.
HANDS-FREE GAS-SPRING ASSIST
Each unit shall be equipped with a gas-spring cylinder that provides sufficient lifting force to allow an adult of average size and weight to set up the unit by applying moderate foot pressure to the unit.
AUTOMATIC SAFETY LOCK
Each unit shall be equipped with a spring actuated locking device that automatically engages upon opening to prevent the unit from folding while in use. As an added safety measure, a horizontal force of approximately 48 lbs. shall be required, while simultaneously operating the lock release, to begin folding the unit.
Units are to be furnished with zinc plated, drop-in couplings, formed of 3/8" diameter round bar. Couplings shall provide a suitable handle for lifting and transporting the folded unit.
Backrails shall be constructed of powder coated tubular steel and shall be equipped with integral clamp-on attachments for fast installation without tools.
All stage components shall be free of defects in materials and workmanship for a period of five years. Any defects discovered and reported in writing within the warranty period shall be corrected by the manufacturer at no cost to the owner.