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| Number | Title | Issue Date |
| 7293668 | Manual boom lift method and apparatus Manual boom lift apparatus and method involve a base having three support legs, a fulcrum configured to fixedly mount the legs, a boom member detachably mounted on the fulcrum, the boom member including on either end a counterbalance arm configured for detachably mo... | 11/13/2007 |
| 6442439 | Pendulation control system and method for rotary boom cranes A command shaping control system and method for rotary boom cranes provides a way to reduce payload pendulation caused by real-time input signals, from either operator command or automated crane maneuvers. The method can take input commands and can apply ... | 08/27/2002 |
| 5265742 | Portable, collapsible hoist apparatus A hoist apparatus for lifting objects up the side of a building or the like and swinging the objects onto the roof or other surface. The hoist can be erected and operated by one person and can be folded into a compact, easily moved, package. A pair of spa... | 11/30/1993 |
| 5135119 | Rescue frame A rescue frame to pivot about footings supported adjacent to an upper edge of a vertical incline. The rescue frame comprises a primary tubular member passing through the footings and having attached thereto a number of secondary tubular members so as to f... | 08/04/1992 |
| 5022489 | Hoisting apparatus for a manhole A hoisting apparatus for a manhole adapted to be fastened to a guardrail of a manhole. The hoisting apparatus is vertically spaced above and extends across the manhole. The hoisting apparatus has two operating positions enabling it to raise an object out ... | 06/11/1991 |
| 4957207 | Extensible hoist for a natero vessel A relocating apparatus having a pivot connector for removably pivotally connecting the apparatus to a mast of a sailing vessel. The relocating apparatus also includes a telescoping sleeve assembly which supports a cable which can be connected to a load su... | 09/18/1990 |
| 4782962 | Back packable portable unit A portable, backpackable crane lift involving a retractable boom, boom cable, winch and winch cable mounted to a wheeled frame with extendable axles all which fold into a compact unit. A shoulder harness apparatus which attaches to the folded unit for car... | 11/08/1988 |
| 4582206 | Mobile aerial hoist A hoist for controllably lifting, holding or lowering an object from a mobile aerial device having an articulated or extendable boom supporting a man-lifting platform. The hoist has an adjustably positioned housing and positioning plate mounted to a shaft... | 04/15/1986 |
| 4529064 | Gravity crane A gravity crane which is manually operated by an operator who is harnessed to one end of a cantilevered balance beam. Clockwise moments are furnished by a fixed counterweight and by a adjustable ballast for coarse balancing. Counterclockwise moment is pro... | 07/16/1985 |
| 4437573 | Boom rack for handling and positioning cargo tie down equipment A boom rack assembly pivotally mounted upon a wall or ceiling, warehouse stacker or the like, either a fixed or movable apparatus, for handling and positioning a cargo net or tie down over palletized cargo. The device includes a pair of vertically dispose... | 03/20/1984 |
