Stage Rigging Handbook, Third Edition

Index

283 Index abrasion, 74 abrasion resistance, 117–18 aircraft cable, 36–37, 39–40, 119–22 air currents, 162 allowable deflection, 34–35 allowable load limit (ALL), 38 allowable load (AL) bridle tension and, 28–29 design factors and, 38–41 allowable working load (AWL), 38 for rope, 73–75 angles fleet, 102–3, 173 and law of sines, 14–15 applied forces, 30–31, 85 arbors(racks),68,97–101,105,112 carpet hoist and, 157–58 counterweight rigging, 137–41, 163–64 guide systems, 139–40 inspection of, 235, 239, 240 attaching loads, 216–23 curtains, 216–17 drops, 217–18 hemp rigging, 104, 106–7 horizontal framed scenery, 221–24 vertical framed scenery, 218–20 See also loading procedure authority having jurisdiction (AHJ), 255–56 basket hitch, 46–47, 63, 125, 129 batten loading, 85–86 batten tie-down, 162 battens, 67, 152 double-purchase counterweight system and, 114–15 horizontal bracing and, 28–29 inspection of, 236, 237–38 installation checklists for, 242–43 lighting, 162 sandwich, 217–18 truss, 222–23 beams, 4 allowable deflection of, 34–35 continuous, 12–13 strength characteristics of, 2–3 using moments to calculate reactions on, 9–12 bearing-friction factors, 52–55 bearings, 43, 48, 55, 82 Becker value, 70–71 becket, 44 belaying, 92 belaying pin, 145–46 Bell curve, 33–34 block-and-tackle rigging, 42 anatomy of, 43–45 counterweight rigging, 151, 156–57, 162 dynamic load and, 47–49 four-line system, 50 friction and, 48–49 inertia and, 47–48 inspecting, 60–61 lacing and reeving of blocks, 59–60 loaddistributiononblock,45–49 mechanical advantage of, 49–59 metal blocks, 44–45 using, 62–64 wooden blocks, 44 blocks hemp-rigging, 82–91 wire-rope, 132–36 Blount, Wally, 230 boat, or line, eye, 220 body, defined, 3 bolts, 215, 232 border light cable, 162 Bo’sun’s chair, 81 brail curtains, 246–47, 257–59 brail winch, 258–59 breaking point, 33–34 breasting, 224–25 breech, 44 bridle analysis, 17–29 bridle tension, 21–23, 25–29 bridle-length calculation, 18–19 hanging points of different heights, 23–26 ratio of horizontal to vertical distance, 26–27 vertical and horizontal forces, 19–21 bridle tension, 21–23, 25–29 allowable loads and, 28–29 horizontal distance and, 26–27 bridling, 223–24 building codes, 254–55 bull line method, 151, 154–55 bull winch/capstan method, 151, 154–56 carpet hoist, 157–59, 163 center of moments, 7 chain-drive motorized counterweight set, 169 chain-drive wind-on-wind-off systems, 170 choker hitch, 46–47, 63 clove hitch, 127–29 communications, 152 components capacity of, 2 design factor of, 38–41 compression sleeves, 202–13 Locoloc tools, 210–13 Nicopress tools, 203–10 compressive forces, 30, 31 computer control, 182–83 computer-aided drafting system (CAD), 18 concentration, 1, 252 construction stretch, 118 corrosion, 233 counterweight rigging arbor, 137–41 double-purchase counterweight system, 114– 15, 141–42 hand line, 141–42 inspection checklist, 237–40 installation checklist, 242–44 introduction, 112–13 loading and unloading with a loading bridge, 144–53 loading and unloading without loading bridge, 153–59 loading bridge, 142–44 lock rails, 136–37 miscellaneous hardware, 114–15 operation summary, 164–65 showtime operation, 159–62 single-purchase counterweight system, 113–14, 141 special problems, 162–64 wire rope, 116–32 wire rope blocks, 132–36 crew communications, 152 flyman, 144 loading-bridge crew, 151–52 rail operator, 106–7, 144–51 runaway set, 152–53 stage crew, 152–53 cuing, 161 curtains, attaching, 216–17 See also fire curtains cut lines, 261 dashpot, 270–71 D/d ratio, 117 dead hanging, 226, 228 dead-haul winch types, 173–74, 187 dead-hung type grids, 45–46 284 285 deceleration devices, 270–71 deflection, allowable, 34–35 design factors (DF), 38–41, 75 for miscellaneous hardware, 116 of rope, 73–74 deus ex machina, 111 diagonal-force vector, 17 direction of force, 5 double-pin rail, 92, 93 double-purchase counterweight system, 114–15, 141–42 dressing, pin rail, 109 drops, 217–18 drum winch, 173 dynamic load, 52 elasticity, 32–33, 69 elastic range, 32–33 electric motorized winches, 168 electric motors, 175 electric-winch components, 177–83 brakes, 178, 241 controls, 179–83 drums, 179 gear reducer, 178, 240 electrothermal links (ETL), 263–64 emergency-stop button, 182, 241 engineers, 3–4...