Patents Assigned to Maruyama Corporation
  • Crusher of chunks of concrete or masonry
    Patent number: 5887810
    Abstract: The present invention relates to a crusher capable of efficiently crushing chunks of concrete or masonry waste, which crusher is attached to a crusher body such as a bucket which is disposed at a distal end of a movable arm or other predetermined place of a civil engineering machine, into small pieces. A pair of toothed crushing plates each having a plurality of radially extending teeth are attached to eccentric shafts mounted on the crusher body.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: March 30, 1999
    Assignee: Maruyama Corporation
    Inventor: Mitsuru Maruyama
  • Metallic waste disposal device for industrial machinery
    Patent number: 5628611
    Abstract: A metallic waste disposal device for industrial machinery, wherein a working unit attached to the distal end of a movable arm of a construction machine is provided with a permanent magnet assembly which attracts and disposes of metallic wastes produced when tearing down a building.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: May 13, 1997
    Assignee: Maruyama Corporation
    Inventors: Yoshiyuki Ito, Hiroshi Aoki