Lawn Mower Robot Blade Height Display With Flexible Ruler
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Solution Overview
Problem
Existing lawn mower robots have limitations in displaying blade height, as the scale indicating the height is restricted to a narrow range of 0° to 360°, making it difficult to accurately display heights beyond 60 mm.
Innovation Solution
A lawn mower robot equipped with a flexible ruler that can be bent and coupled to an elevating frame, allowing the ruler to move up and down and back and forth, enabling the display of blade height in a wider range (2 cm to 9 cm) through a display window, without marking scales on the height adjustment knob.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scales are displayed on the height adjustment lever along the circumferential direction (0° to 360°), then the blade height can be displayed within a limited range (20 mm to 60 mm), but it becomes difficult to display heights beyond 60 mm
Solution Approach 1:
The patent transitions from displaying height scales on a two-dimensional circumferential surface of the adjustment lever to using a flexible ruler that can be bent into a three-dimensional arc shape. This ruler is mounted on the elevating frame and passes through a guide hole in the cover, allowing the display surface to extend beyond the limited 360° circumferential space while maintaining visual accessibility through the cover's opening.
Solution Approach 2:
The flexible ruler is designed to move dynamically with the elevating frame. As the frame moves up and down to adjust blade height, the ruler moves accordingly, with its upper end bending along a curved path guided by the guide hole. This dynamic movement allows the ruler to maintain proper orientation and visibility throughout the adjustment range while accommodating the mechanical motion of the system.
2Measurement precision
If a flexible ruler is used to display blade height in a wider range, then heights beyond 60 mm can be displayed (2 cm to 9 cm range), but the ruler must be bent and guided to minimize friction and noise
Solution Approach 1:
The guide hole acts as an intermediary element between the flexible ruler and the cover. It provides a controlled path for the ruler to bend and move, reducing direct contact and friction between the ruler and the cover structure. The guide hole's curved geometry is specifically designed to match the ruler's bending path, minimizing resistance and noise while ensuring smooth operation throughout the height adjustment range.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate and visible display of blade height in a wider range, improving user recognition and facilitating adjustments, while minimizing friction and noise during movement.
Implementation Method 1
a rotating cylindrical portion having male threaded portions on an outer circumferential surface thereof, and an elevating frame provided with spiral protrusions on an inner circumferential surface thereof to be engaged with the male threaded portions, so as to be movable up and down in response to rotation of the rotating cylindrical portion
Data Source
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AI summary
The present invention relates to a lawn mower robot, including: an outer cover (100); an inner body (110) accommodated inside the outer cover and having a plurality of wheels (113) on both side surfaces for traveling; a rotating plate (133) rotatably mounted on a bottom surface of the inner body; a plurality of blades (131) rotatably mounted on the rotating plate to cut grass; a height adjustment unit (140) to adjust the height of the blades; and a height display unit (150) to display the blade height, wherein the height display unit includes: an inner cover (104) mounted on an upper portion of the outer cover; a display window (156) formed through one side of the inner cover; and a ruler (151) having numerals on an upper surface to display the height of the blades, and mounted inside the inner body to be movable up and down and back and forth in correspondence to movement of the height adjustment unit.