Lawn Mower Telescoping Shaft Control for Stationary Operation
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Solution Overview
Problem
Existing lawn mowing devices require the user to physically move the mower, which can be labor-intensive and limits control from a stationary position.
Innovation Solution
A lawn mowing device equipped with a mower and a controller that allows users to control movements from a stationary position using a telescoping shaft with a universal joint, enabling propulsion and direction control via two engines, one for rotating the blade and another for forward movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user physically moves the mower, then the mower can be operated, but user labor and physical exertion increase
Solution Approach 1:
The patent replaces the manual mechanical pushing and steering system with an automated propulsion system. A propulsion device with drive wheels and a control system substitute for human physical effort, allowing the mower to move autonomously while the user only needs to provide steering commands through the handle.
Solution Approach 2:
The mower is equipped with self-propulsion capabilities through an integrated propulsion device. The system can autonomously navigate and move forward without requiring the user to physically push or pull it, effectively making the mower serve itself in terms of locomotion while remaining controllable by the user.
2Measurement precision
If the user controls the mower from a stationary position using a telescoping shaft, then control precision improves, but device complexity increases
Solution Approach 1:
The handle assembly incorporates a telescoping shaft that can dynamically adjust its length during operation. This dynamic structure allows the user to optimize the control distance based on working conditions, providing precise control from a stationary position while maintaining operational flexibility.
Solution Approach 2:
The telescoping shaft acts as an intermediary control mechanism between the user and the mower's propulsion system. It transmits steering commands from the handle to the propulsion device, enabling precise directional control while isolating the user from the mechanical complexity of the propulsion system.
3Adaptability or versatility
If two engines are used (one for blade rotation, one for propulsion), then functional versatility improves, but device complexity increases
Solution Approach 1:
The power system is segmented into two independent functional units: a cutting mechanism with its own drive system for blade rotation, and a propulsion mechanism with its own drive system for movement. This segmentation allows each subsystem to be optimized independently for its specific function while working together as an integrated whole.
Solution Approach 2:
The mower is designed with multi-functionality by integrating both cutting and self-propulsion capabilities into a single device. The dual-engine configuration enables the machine to perform multiple functions (cutting grass and autonomous movement) that would otherwise require separate devices, increasing versatility despite the added complexity.
Data Source
AI summary
The lawn mowing device comprises a mower and a controller. The lawn mowing device may be adapted to be operated by a user from a stationary position. Movements of the mower may be controlled from the stationary position using the controller. The mower may comprise a first engine for rotating a blade located under a deck of the mower and a second engine for propelling the mower forward. The controller may comprise a control bracket coupled to the top of the deck and a telescoping shaft that is coupled to the top of the control bracket via a universal joint. The user may control the movements of the mower by manipulating a distal end of the telescoping shaft.