Patent ID: 8001754
Filing Date: 2011-08-23
Classification: A01D

Abstract:
1. A height adjuster mechanism for mounting on a frame of a ground treatment machine, and connectable to a ground-engaging roller assembly of the machine, in which the mechanism is adjustable in order to vary the height of the frame relative to the roller assembly and thereby adjust the height setting of different types of ground treatment modules mounted on the frame, and the mechanism comprising: an elongate height adjuster connectable at a lower end to the roller assembly, and which is mounted on the frame to carry out up and down movement lengthwise of an axis of the elongate height adjuster in order to adjust the height setting of a particular treatment module of the different types of treatment modules; an external thread provided on at least part of the elongate adjuster; a rotary adjuster having an internally threaded socket portion rotatably mounted on the external thread of the elongate height adjuster, such that rotation of the rotary adjuster can cause lengthwise adjustment of the elongate adjuster; an open-topped housing provided on the rotary adjuster and having an upper surface which defines a height adjustment reference datum level; an insert mounted on the upper end of the elongate adjuster and which is movable up and down within the open-topped housing as a consequence of lengthwise adjustment of the elongate adjuster, and in which the upper surface of the insert can be adjusted to be substantially flush or coplanar with an upper surface of the open-topped housing so as to set a datum level of a particular treatment module of the different types of treatment modules and, wherein the insert is stepped for determining the extent of angular adjustment of the rotary adjuster from the datum level position; and wherein the different types of ground treatment module each have a requirement for a different datum level, such that each step, when adjusted to be flush with the reference datum level, provides a required height adjustment corresponding to each particular treatment module.