Portable hoisting system

{
  "publication_number": "US5797504A",
  "country": "US",
  "kind": "A",
  "title": "Portable hoisting system",
  "abstract": "A hoisting system for lifting construction items at a construction site that includes a base assembly, a telescoping pole assembly carried on the base assembly, a slidably positionable line guide assembly slidably mounted to the telescoping pole assembly, a hoisting line assembly having a hoisting line threaded through a guiding aperture of the line guide assembly, and a ratcheting winch assembly mounted onto the telescoping pole assembly and including a take up reel upon which a length of the hoisting line is wound.",
  "claims": [
    "1. A portable hoisting system comprising: a base assembly; a telescoping pole assembly carried on said base assembly; a slidably positionable line guide assembly slidably mounted to said telescoping pole assembly; a hoisting line assembly having a hoisting line threaded through a guiding aperture of said line guide assembly; and a winch assembly mounted onto said telescoping pole assembly and including a take up reel upon which a length of said hoisting line is wound; said base assembly including a base plate, four legs, each leg being coextensive along a different side of the base plate and extending from said base plate, and four swivel mounted rollers mounted to an underside surface of said base plate, each leg including a user adjustable leveling support; said telescoping pole assembly including a lower pole rigidly mounted to an upper side surface of said base plate and an upper pole telescopically positionable with respect to said lower pole, said upper pole being lockable in a fixed position with respect to said lower pole with at least one pole locking pin assembly; said slidably positionable line guide assembly including a tubular slide portion slidably positionable over an end of said upper pole, a U-shaped pulley housing rigidly secured to said tubular slide portion, a line guide including a pulley rotatably mounted within said U-shaped pulley housing, and at least one line guide assembly locking pin, said tubular slide portion having a rear assembly locking pin hole and a forward assembly locking pin hole formed through said sidewalls thereof, said line guide assembly locking pin being sized in a manner to be insertable through said rear assembly locking pin hole, said forward assembly locking pin hole and a pair of said number of concentrically aligned forward and rear pole locking pin holes; said ratcheting winch assembly including an elongated handle section attached to said take up reel and of a length sufficient to extend past said side edge of said lower pole of said telescoping pole assembly."
  ],
  "description_excerpt": "The present invention relates to mechanical hoisting devices and more particularly to a portable hoisting system that includes a base assembly, a telescoping pole assembly carried on the base assembly, a slidably positionable line guide assembly slidably mounted to the telescoping pole assembly, a hoisting line assembly having a hoisting line threaded through a guiding aperture of the line guide assembly, and a ratcheting winch assembly mounted onto the telescoping pole assembly and including a take up reel upon which a length of the hoisting line is wound; the base assembly including a base plate, four radiating legs extending from the base plate, and four swivel mounted rollers mounted to an underside surface of the base plate, each radiating leg including a user adjustable leveling support; the telescoping pole assembly including a lower pole rigidly mounted to an upper side surface of the base plate and an upper pole telescopically positionable with respect to the lower pole, the upper pole being lockable in a fixed position with respect to the lower pole with at least one pole locking pin assembly; the slidably positionable line guide assembly including a tubular slide portion slidably positionable over the end of the upper pole, a U-shaped pulley housing rigidly secured to the tubular slide portion, a line guide including a pulley rotatably mounted within the U-shaped pulley housing, and at least one line guide locking pin, the tubular slide portion having a rear ...",
  "cpc": [
    "B66C 23/166",
    "B66C 23/20",
    "Y10S 212/901"
  ],
  "ipc": [
    "B66C 23/20"
  ],
  "inventors": [
    "Burney Mangum"
  ],
  "filing_date": "1997-06-16",
  "publication_date": "1998-08-25",
  "grant_date": "1998-08-25",
  "priority_date": "1997-06-16",
  "application_number": "US-87686197-A",
  "family_id": "25368728",
  "cited_by_count": 25,
  "citations": [
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  ]
}