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![[Search a list of Patent Appplications for class 212]](../as.gif) Class 212 | TRAVERSING HOISTS |
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![[List of Patents for class 212 subclass 272]](../ps.gif) | 272 | HAVING MEANS TO PREVENT OR DAMPEN LOAD OSCILLATIONS |
| | 276 | HAVING RANDOM CONDITION SENSOR COMBINED WITH AN INDICATOR OR ALARM OR CONTROLLING MEANS OR DISABLING MEANS |
| | 277 |  Senses crane tilt (e.g., outrigger sensors) |
| | 278 | Means determining overloading produced by load (e.g., strain gauges) |
| | 279 | Sensor regulates counterweight or counterbalancing means |
| | 280 | Boom movement stops responsive to overtravel or proximity to powerline |
| | 281 | Hoisting stops upon load being raised to a predetermined position (e.g., anti-two blocking) |
| | 282 | WITH MECHANICAL INDICATOR |
| | 284 | WITH MOTOR CONTROL |
| | 285 | Remote control or at dual control positions |
| | 286 | Cyclic operation |
| | 287 | Manual fluid valve actuator |
| | 290 | In control cab |
| | 291 | HAVING OPERATOR SUPPORT OR CAB |
| | 292 | BOOM POSITION LOCK |
| | 293 | HAVING SNUBBER OR BOOM BACKSWING STOP |
| | 166 | CLOSURE REMOVER |
| | 167 | WITH HAUL-IN LINE |
| | 168 | WITH MEANS TO PROJECT LOAD ENGAGER BEYOND END OF BOOM |
| | 169 | GROUND WHEEL OPERATED |
| | 170 | HAVING CLUTCH OR VARIABLE SPEED TRANSMISSION |
| | 171 | Traveling bridge |
| | 172 | Power takeoff |
| | 173 | Variable speed transmission |
| | 174 | Including means to selectively couple plural hoist functions to common power shaft |
| | 175 | HAVING MEANS FACILITATING ASSEMBLY OR DISASSEMBLY |
| | 176 | Of sectional vertical support from boom |
| | 177 | Of boom sections |
| | 178 | Of counterweight from hoist |
| | 179 | Of traversing hoist from support |
| | 294 | ADJUSTABLE TO TRANSPORT OR NONUSE POSITION (E.G., COLLAPSIBLE) |
| | 295 | Crane boom supported by foldable or collapsible tower |
| | 296 |  Extensible tower of relatively sliding sections |
| | 297 | Hydraulically pivoted tower or tower sections |
| | 298 | Collapsible inverted "V" frame supports boom rigging |
| | 299 | Collapsible or foldable boom |
| | 301 | Vehicle stablizing means |
| | 307 | SHIP MOUNTED OR FLOATING (E.G., A CRANE FIXED TO A PLATFORM ADAPTED TO FLOAT) |
| | 308 | Including counterweight or means to compensate for list, trim or skew of vessel |
| | 309 | Having horizontally and vertically swinging boom |
| | 195 | HAVING COUNTERWEIGHT OR COUNTERBALANCING MEANS |
| | 199 | HAVING BOOM SHIFTABLE VERTICALLY ALONG A LINEAR PATH |
| | 200 | Movable along nonvertical rectilinear path |
| | 201 | Length of hoisting cable between boom and load decreases automatically as boom is raised |
| | 202 | Vertically spaced fastening means along boom support |
| | 203 | Fluid actuated |
| | 204 | By mounting on vertically extensible support |
| | 312 | TRAVELING BRIDGE |
| | 313 | Flexible |
| | 314 | Having vertically adjustable track |
| | 315 | Supporting second traveling bridge |
| | 316 | Having plural trolleys |
| | 317 | Having vertically or horizontally swinging boom on bridge or trolley |
| | 318 | Having horizontally swingable track- or load-rotating means on trolley |
| | 319 | Having load engager mounted for guided vertical movement beneath trolley |
| | 320 | Motor fixed to bridge-supporting structure |
| | 321 | Trolley mounted motor for trolley traversal via cable means |
| | 322 | Bridge mounted motor for trolley traversal via cable means |
| | 323 | Bridge mounted motor for load lifting |
| | 324 | Having vertical supporting legs (e.g., gantry) |
| | 327 | Having specific engager for load |
| | 223 | HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE |
| | 224 | Boom mounted for guided horizontal translation (e.g., trolley mounted) |
| | 225 | Having trolley thereon |
| | 226 | Having vertical support remote from pivot (i.e., swinging bridge) |
| | 227 | And vertically swinging |
| | 228 | And means acting independently of hoist mechanism to shift trolley |
| | 230 | Extensible by movement of boom or boom segment along longitudinal axis thereof |
| | 232 | And vertically swinging |
| | 233 | Plural booms |
| | 234 | With adjacent load-supporting rack |
| | 235 | Including means for sluing boom as it is swung vertically |
| | 236 | Including plural actuating means converging toward boom tip to effect both horizontal and vertical swinging |
| | 237 | Including means to swing boom vertically |
| | 242 | Having specific engager for load |
| | 245 | And means to swing boom horizontally |
| | 246 | Including flexible member driving gear or pulley having axis collinear with boom pivot |
| | 247 | Gear drive |
| | 249 | Human or animal powered |
| | 250 | Having fluid ram directly actuating load cable or sheave therefor |
| | 251 | Having specific engager for load |
| | 252 | Having passage for hoist cable through boom supporting member |
