UL 14B:2008 pdf download – Sliding Hardware for Standard, Horizontally Mounted Tin-Clad Fire Doors.
9 Stay Rolls
9.1 A stay roll, Type No. 1, for a three-ply tin-clad door shall be a U-shaped member and shall be made
ot flat-rolled steel, 2.1/2 in (64 mm) wide and 1/2 in (127 mm) thick, as shown in Figures 9.1 and 9.2 or
9.5-
9.2 The side next to the wall shall be 6-3/4 in (172 mm) long above the sill, the upper 2-1/2 in (64 mm) being offset 1/2 in (12.7 mm) to receive the angle-shaped strap for fastening it to the wall.
9.3 The side bearing the roller shall be long enough so that the center of the roller is 7.1/2 in (191 mm) above the sill. The inside distance between the sides 01 the guide shall be 3-318 In (86 mm).
9.4 A guide shall be fastened against the wall by an angle piece made of 2-112 by 1/2 in (64 by 12.7 mm) steel. The side of the angle on the face of the wall shall be 8-1/2 in (216 mm) long, the end being offset 3/4 In (19.1 mm) and provided with a 13/16 in (20.6 mm) hole 6 In (152 mm) from the end of the angle. The opposite side shall be 10 in (254 mm) long, a 9116 in (14.3 mm) hole for a 1/2 in (12.7 mm) eye-bolt being provided 8-1/4 in (210 mm) back from the face of the wall. The angle piece shall be drilled and countersunk for a 1/2 in (12.7 mm) countersunk machine screw with which it Is fastened to the guide. A 1/2 in (12.7 mm) eye-bolt, 7 in (178 mm) long, shall be provided for attaching the end of the angle in the door opening to the 3/4 in (19.1 mm) wall bolt.
9.5 When roller guides are bolted together through the wall, a U-shaped strap shall be provided.
9.6 A roller shall be of cast iron or malleable iron. 3-1/2 in (89 mm) in diameter, 1 in (25.4 mm) wide, and rounded slightly at the rim. It shall have an adjustment of 34 in (19.1 mm) and shall be fastened in position by a 112 in (12.7 mm) bolt and shall turn on a finished bushing around this boll. Washers, as shown in Figure 9.1, shall be placed on each side of the bushing. The roller shall turn freely when clamped in position.
9.7 A 3/4 in (19.1 mm) finished pin, bearing against a shoulder and washer so that the roller Is not bound and prevented from turning, shall be used in place of the bolt and bushing specified above.
10 Chafing Strips
10.1 A chafing strip for the back of the door shall be made of 14 in (6.4 mm) thick halt oval steel not less
than 3i4 in (19.1 mm) and not more than I in (25.4 mm) wide. A strip shall be drilled and countersunk for
1/4 In (6.4 mm) bolts, spaced not to exceed 9 in (229 mm) apart. Ends shall be chamfered. Details are
shown in Figure 10.1.
10.2 A chafing strip for the front of the door shall be made of 1 by 1/8 in (25.4 by 3.2 mm) flat steel, drilled
to correspond with the half-oval strips on the back of the door.
10.3 The length of a chafing strip shall be 4 in (102 mm) less than the Width of the wall opening.
104 A chafing strip to take the wear of the roller guide shall be made of 1.1/2 by 1/8 in (38 by 3.2 mm) flat steel having a length of 5 in (127 mm) less than the width of the door and shall be drilled and countersunk for No. 9 (4.5 mm diameter) wood screws spaced not to exceed 12 in (305 mm) apart.
10.5 A rear-binder pocket strip shall be made of not less than 0.093 in (2.36 mm) flat steel not less than 1-112 in (38 mm) Wide. A strip shall be drilled and countersunk for 1/4 in (6.4 mm) bolts spaced not to exceed 9 in (229 mm) apart. Ends of rear-binder pocket strip shall be chamfered.
10.6 The length of a rear-binder pocket strip shall be 4 in (102 mm) less than the wall opening. The strip shall butt against the rear-binder pocket.
10.7 Bolts sized 1/4 in (6.4 mm). with countersunk heads, 3-1/4 in (83 mm) long, and No. 9 (4.5 mm diameter) flat-head wood screws. 1-1/4 in (32 mm) long, shall be provided for each countersunk hole in the provided chafing strip.
10.8 Chafing strips for two-ply tin-dad doors are constructed the same as for 2-1/2 in (64 mm) three-ply doors, except that the bolts are 2-112 in (64 mm) long.