Theatre Solution Prima Auditorium Seating - Manual (Page 31)

30 Specifications Prima Auditorium Seating
2.6 UPHOLSTERED SEATS/BACKS
A. General: Fabricate theater seating with padding and fabric covering. Equip each seat with a gravity self-
rising mechanism so that unoccupied seats return to an upright position perpendicular to the base line of
floor of auditorium. Spring compensating mechanism will not be acceptable. Chair profile with the seat in
the upright position cannot exceed 20-1/4”.
B. Seat Construction: The inner seat panel shall be an assembly of 3/4” thick Birch plywood with 3/4” thick
seasoned hardwood side supports and 12 gauge 9” x 1-3/4” cold-rolled steel reinforcement brackets. The
polyurethane foam padding material shall be two-ply and shall consist of 2” thick 55 lb. ILD and 1” thick
45 lb. ILD, shall be glued to the inner panel, and shall conform to the California Bureau of Home
Furnishings Technical Bulletin 117. The seat shall be upholstered on all surfaces and enclosed at the
rear/bottom with a zipper allowing for easier on-site reupholstery. The complete seat assembly shall be
supported by two 7 gauge formed steel mounting brackets which will attach the seat assembly to the
hinges on the leg panels. The seat shall have a built-in counterweight to insure automatic self-rising
without the aid of springs. Arch-spring seat construction will not be acceptable.
C. Back Construction: The back assembly shall consist of one inner lumbar panel and one inner shoulder
panel which shall each be constructed of 1/2” thick Birch plywood, and one outer back panel which shall be
constructed of 3/4” thick Birch plywood. The padding material on the shoulder cushion shall be 1-1/2” thick
polyurethane foam; the padding material on the lumbar cushion shall be 2” thick. All padding shall be glued
to the inner panels, and shall conform to the California Bureau of Home Furnishings Technical Bulletin 117.
The outer panel shall contain six 1/4-20 threaded inserts and shall be assembled to the leg panels with two
11 gauge steel angle brackets. The inner back panels shall be attached to the outer panel by means of (4)
bayonet hanging brackets and (4) 16 gauge flat steel attachment brackets in a manner resulting in a rigid
connection with no visible fasteners. The inner and outer back panels shall be upholstered on all surfaces.
D. Hinge: The seat hinge shall be a weldment consisting of a 7 gauge hot-rolled pickled-in-oil steel component
and shall be formed and punched to receive a 0.56” id x 0.75” od x 0.5” long steel bushing. A self-
lubricating nylon sleeve shall be fitted between the seat hinge and the standard seat hinge pin. The hinge
shall be machined to provide a positive stop location for the seat in both occupied and unoccupied
positions. The hinge shall be fitted with a plastic cover to eliminate all pinch points and shall include a
3/16” thick urethane rubber pad to dampen noise upon the seat return to the vertical position.