Patents Assigned to Airmaster Sales Ltd.
  • Patent number: 4770252
    Abstract: A tine mounting arrangement for a harrow provides a transverse elongate support member with a plurality of stub shafts extending outwardly therefrom in the same horizontal plane at an angle of 45.degree.. Each stub shaft carries a pair of spring tines with the springs wrapped around the shaft and an inclined portion of the tine extending forwardly from the angled shaft and therefore at an angle to the transverse support member. Two such members can be mounted on pivot arms to provide a transverse reciprocating working action of the tines. This harrow element can be mounted upon support arms pivoted from a draw bar and carried on ground wheels which may be simple depth wheels or may form packer wheels. In an alternative arrangement the packer wheels and harrow element are mounted on a subframe which can be reversed so that the packers operate in advance of the harrow element.
    Type: Grant
    Filed: February 17, 1987
    Date of Patent: September 13, 1988
    Assignee: Airmaster Sales Ltd.
    Inventor: Wilfred G. Williamson
  • Patent number: 4685524
    Abstract: A tine mounting arrangement for a harrow provides a transverse elongate support member with a plurality of stub shafts extending outwardly therefrom in the same horizontal plane at an angle of 45.degree.. Each stub shaft carries a pair of spring tines with the springs wrapped around the shaft and an inclined portion of the tine extending forwardly from the angled shaft and therefore at an angle to the transverse support member. Two such members can be mounted on pivot arms to provide a transverse reciprocating working action of the tines. This harrow element can be mounted upon support arms pivoted from a draw bar and carried on ground wheels which may be simple depth wheels or may form packer wheels. In an alternative arrangement the packer wheels and harrow element are mounted on a subframe which can be reversed so that the packers operate in advance of the harrow element.
    Type: Grant
    Filed: November 19, 1985
    Date of Patent: August 11, 1987
    Assignee: Airmaster Sales Ltd.
    Inventor: Wilfred G. Williamson