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Valve lock

  • US 6,009,897 A
  • Filed: 07/29/1998
  • Issued: 01/04/2000
  • Est. Priority Date: 07/29/1998
  • Status: Expired due to Fees
First Claim
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1. A valve lock for removably blocking an access pipe to an underground valve, comprising:

  • a cylindrical hollow pipe;

    a plurality of closure wedges at the ends thereof having first and second wedge surfaces, said closure wedges each having a semi-cylindrical outer surface;

    a base wedge fixed to an end of said pipe, the base wedge having a first closure wedge-engaging surface facing said first wedge surface;

    a thrust wedge longitudinally spaced from said base wedge by said plurality of closure wedges, said thrust wedge having a second closure wedge-engaging surface facing said second wedge surface;

    an actuation device engaged to said thrust wedge driving said second closure wedge-engaging surface against said second surface and said first surface against said first closure wedge engaging-surface forcing said plurality of closure wedges radially outwardly,whereby said semi-cylindrical outer surfaces of said closure wedges engage an inner wall surface of the access pipe over a significant circumferential extent of the inner wall surface.

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