Lawn Mower Handle Interlock for Brake-Linked Control Locking
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Solution Overview
Problem
Existing lawn mowers face challenges in design efficiency, accessibility, and ergonomics, particularly in stand-on models, with issues related to fuel tank access, hydraulic hose routing, vibration reduction, and maneuverability.
Innovation Solution
The lawn mower incorporates features such as recessed channels for hydraulic hoses, removable thigh pads, angled footplate supports, and improved interlock designs to enhance accessibility and maneuverability, along with dampening washers to reduce vibration, and a zero-radius turning capability through independent wheel control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional interlock design is used for locking mower hand controls, then the interlock function is provided, but the design complexity increases and accessibility is reduced
Solution Approach 1:
The interlock system is segmented into modular components: a parking brake lever assembly and a separate handle control interlock assembly. The interlock assembly includes a pivotable arm with a locking surface that independently engages with the handle control flange, separating the braking function from the steering lock function while maintaining reliable interlocking
Solution Approach 2:
The interlock function is extracted from the main brake mechanism and implemented as a separate pivotable arm assembly. This extracted interlock mechanism engages independently with the handle control flange, simplifying the overall design by removing complex integrated mechanisms while maintaining the safety interlock function
2Reliability
If a traditional interlock design is used for locking mower hand controls, then the interlock function is provided, but ease of operation is reduced
Solution Approach 1:
The pivotable interlock arm is designed to automatically engage and disengage based on the position of the parking brake lever. When the brake lever is pulled, the interlock arm pivotably engages the handle control flange automatically without requiring manual intervention, making the system self-regulating and easy to operate
Solution Approach 2:
The interlock mechanism uses a pivotable arm that can dynamically move between engaged and disengaged positions. This dynamic design allows the interlock to automatically adapt to the brake lever position, improving ease of operation compared to fixed or manually-adjusted interlock mechanisms
3Ease of operation
If hydraulic hoses are routed on the exterior of the fuel tank, then ease of access is provided, but the mower外观设计 is compromised and protection is reduced
Solution Approach 1:
The hydraulic hoses are nested within recessed channels that are formed directly in the fuel tank structure. This nesting approach allows the hoses to be protected within the tank body while still providing access points, maintaining the external appearance of the fuel tank while accommodating the hydraulic routing needs
4Ease of operation
If hydraulic hoses are routed on the exterior of the fuel tank, then ease of access is provided, but protection is reduced
Solution Approach 1:
The hydraulic hoses are nested within recessed channels that are formed directly in the fuel tank structure. This nesting approach allows the hoses to be protected within the tank body while still providing access points, maintaining the external appearance of the fuel tank while accommodating the hydraulic routing needs
Solution Approach 2:
The fuel tank structure itself acts as a flexible protective shell that encloses and protects the hydraulic hoses within its recessed channels. This shell approach provides inherent protection against damage while allowing for thermal expansion and contraction of the hoses
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
These features improve the mower's design efficiency, facilitate easy maintenance, enhance ergonomics, and provide better curb clearance and maneuverability, resulting in a safer and more reliable operating environment.
Implementation Method 1
at least one dampening washer (e.g., felt washer) and bearing structure positioned and configured to reduce vibration and/or oscillation/movement of pivotal mower hand controls
Data Source
AI summary
A lawn mower may include at least one of: (a) recessed channel(s) in a fuel tank configured for receiving hydraulic hose(s); (b) hydraulic reservoirs, for hydraulic fluid for corresponding transmissions, mounted on a plate and configured to be easily removable for fuel tank access; (c) a fuel tank including a protruding tower including a fuel gauge, where the fuel gauge is configured to be viewable through a hole in a dash panel of the mower and mounted substantially flush with the hole in the dash panel plate; (d) a pivotable and removable thigh pad for stand-on applications where the thigh pad is configured to be easily removable by hand without the need for any tool; (e) a pivotal footplate with angle portions for receiving respective feet of a mower operator; (f) a support under the footplate, where cross members of the support are angled upwardly in order to increase clearance at bottom sides of the mower inside rear drive wheels, such as for improved curb clearance during mower operations and/or to provide for more efficient use of space; (g) an improved interlock design for selectively locking mower pivotal hand controls upon pulling of a parking brake lever/handle; and/or (h) at least one dampening washer (e.g., felt washer) and bearing structure positioned and configured to reduce vibration and/or oscillation/movement of pivotal mower hand controls.