Adjustable Patents (Class 172/372)
Plural tools relatively adjustable (Class 172/373)
  • Tiller with automatically adjusted angle of attack
    Patent number: 4246970
    Abstract: The invention relates to a hand device for tilling the earth comprising a flat blade sharpened on all edges which is mounted on a side of a resilient, preferably trapezoidal shaped, frame, with the opposite side of the frame being mounted upon an elongated handle. The tilling device includes an automatic depth control including the resilient frame.
    Type: Grant
    Filed: October 30, 1978
    Date of Patent: January 27, 1981
    Inventor: Gordon R. Franke
  • Pendulum type hoe
    Patent number: 4093031
    Abstract: A pendulum type hoe has a stirrup-shaped blade mounted to the fork of a handle for limited articulation. Inturned flanges of the blade engage hourglass shaped openings in the fork arms, the flanges being retained between reinforcing bars which project through the openings and afford strength, wear resistance, and limited resilience to the blade. The fork is made in two separable parts whereby any component of the hoe may be replaced.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: June 6, 1978
    Assignee: True Temper Corporation
    Inventor: William E. Portz