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Locking system for extension members on portable lifts

  • US 5,667,352 A
  • Filed: 04/18/1994
  • Issued: 09/16/1997
  • Est. Priority Date: 04/18/1994
  • Status: Expired due to Fees
First Claim
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1. A locking system on a portable lift comprising:

  • a base for a mast comprising a generally horizontal elongated socket having an entry end, said base including a chamber exposed to said socket by a side opening adjacent said entry end, said chamber having a downwardly sloping wall facing toward said socket;

    an extension member slidably mounted in said socket; and

    a locking mechanism for said extension member including;

    a wedge block in said chamber having a tapered face complementing and normally engaging said sloping wall, and having a jaw face facing toward said socket, said wedge block being confined against horizontal movement parallel to the length of said socket;

    a spacer seated on said base above said chamber; and

    an adjustment bolt having an enlarged head engaging said spacer to prevent downward travel of said bolt, said bolt extending downwardly from its said head through an opening in said base into a threaded hole in said block such that turning of said bolt raises or lowers said block and responsively moves said tapered face on said sloping wall so as to responsively move said jaw face toward said socket for selectively engaging and locking said extension member relative to said base, said side opening being large enough to permit movement of said jaw face into locking engagement with said extension member.

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