Patents Assigned to Knud W. Petersen
  • Crane grab
    Patent number: 4127298
    Abstract: A crane grab suspended by a single crane wire includes an operator-activated control means shiftable between a first position, in which open grab halves will be closed for digging in response to the crane wire being hoisted, and a second position, in which the grab halves are allowed to open themselves when placed on the ground and thereafter hoisted again.
    Type: Grant
    Filed: January 31, 1977
    Date of Patent: November 28, 1978
    Assignee: Knud W. Petersen
    Inventor: Poul V. Egholm