Robotic mower with secured screw-nut interface for adjustable cutting height

A height adjustment assembly for a robotic mower comprising a chassis, a cutting motor mounted on a motor bracket, the cutting motor driving at least one cutting blade, the motor bracket providing structural support for the cutting motor at an adjustable level relative to the chassis, the height adjustment assembly comprising:

• a biasing element;
• a screw engagement nut;
• and
• a height adjustment screw,
• wherein the screw engagement nut is operably coupled to the motor bracket to enable adjustment of a height of the motor bracket via rotation of the height adjustment screw, the height adjustment screw rotates to translate the screw engagement nut vertically along the height adjustment screw based on an engagement of teeth on the screw engagement nut with threads of the height adjustment screw, and the teeth of the screw engagement nut are urged toward the threads of the height adjustment screw via the biasing element,
• wherein the height adjustment screw is arranged to extend along a first direction to enable adjustment of the height of the motor bracket responsive to translation of the screw engagement nut along the first direction in response to rotation of the height adjustment screw,
• wherein the biasing element is disposed to urge the screw engagement nut in a second direction that is substantially perpendicular to the first direction, and
• wherein the screw engagement nut is suspended from a pivot point disposed at a portion of a nut housing at least partially surrounding the screw engagement nut.

A height adjustment assembly for a robotic mower comprising a chassis, a cutting motor mounted on a motor bracket, the cutting motor driving at least one cutting blade, the motor bracket providing structural support for the cutting motor at an adjustable level relative to the chassis, the height adjustment assembly comprising:

• a biasing element;
• a screw engagement nut;
• and
• a height adjustment screw,
• wherein the screw engagement nut is operably coupled to the motor bracket to enable adjustment of a height of the motor bracket via rotation of the height adjustment screw, the height adjustment screw rotates to translate the screw engagement nut vertically along the height adjustment screw based on an engagement of teeth on the screw engagement nut with threads of the height adjustment screw, and the teeth of the screw engagement nut are urged toward the threads of the height adjustment screw via the biasing element,
• wherein the height adjustment screw is arranged to extend along a first direction to enable adjustment of the height of the motor bracket responsive to translation of the screw engagement nut along the first direction in response to rotation of the height adjustment screw,
• wherein the biasing element is disposed to urge the screw engagement nut in a second direction that is substantially perpendicular to the first direction, and
• wherein the teeth of the screw engagement nut comprise at least one top partial tooth disposed above, and at least one bottom partial tooth disposed below, a tooth that is wider than the top partial tooth and the bottom partial tooth.