×

Method for cleaning concrete delivery trucks

  • US 5,507,875 A
  • Filed: 07/29/1994
  • Issued: 04/16/1996
  • Est. Priority Date: 07/29/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. A process for removing hardened concrete from an interior wall surface of a truck-mounted concrete drum defined by said interior wall surface and an exterior wall surface and rotatable so as to cause said interior and exterior wail surfaces to pass through an upwardly directed top position, said process comprising applying to said exterior wall surface of said drum at said top position vibratory energy having a frequency of 2 blows per second to 20 blows per second, and a force between 10 pounds and 40 pounds, said vibratory energy being applied by a vibration-producing device pendently secured to an adjustable laterally directed holding arm in a manner permitting said device to contact said exterior wall surface at said top position.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×