Theatre Solution Prima Auditorium Seating - Manual (Page 27)

26 Specifications Prima Auditorium Seating
D. All leg panels shall include a plinth base of seasoned maple hardwood fitted with 1/4-20 threaded inserts
for assembly of floor attachment hardware.
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 20-13/16”.
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: Solid back construction comprised of a plywood veneer outer panel, one inner lumbar
plywood panel, and one inner shoulder plywood panel. The outer panel shall be 3/4” thick, faced one side
with Grade A veneer centered across the width of the panel, and exposed plywood laminations along all
edges. The inner panels shall be 1/2” thick. Plywood panels shall be electronically glued hardwood
plywood. Inner panels shall be fastened to the outer panel with four bayonet hanging brackets at the top
and four 16 gauge flat steel brackets using four #8 x 1/2” pan head sheet metal screws at the bottom,
resulting in a rigid connection with no visible fasteners. The veneer face and edges of the outer panel shall
be stained to match the architect’s sample. 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 panel, 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.
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.