Lawn Mower Control Arm Latch for Operational and Stored Positions
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Solution Overview
Problem
Existing lawn mower steering mechanisms lack efficient mechanisms for securing the steering components in operational and stored positions, leading to potential wear and inefficiencies in maneuvering and fuel consumption.
Innovation Solution
A control arm mechanism with a latch system that includes a rod biased by members into recesses for securing the upper arm in operational or stored positions, featuring a journal bearing for smooth movement and a brake actuation system to lock wheels in the stored position, allowing the engine to remain running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch mechanism is added to secure the upper arm in operational and stored positions, then wear on steering components is reduced and maneuverability is enhanced, but device complexity increases
Solution Approach 1:
The control arm assembly is divided into distinct functional components: upper arm, lower arm, latch mechanism with rod and biasing member, journal bearing, and brake actuation system. Each component performs a specific function, allowing the complex system to be managed through modular segmentation while achieving reliable position securing and reduced wear through the journal bearing's specialized role.
2Loss of energy
If a brake actuation system is integrated to lock wheels in stored position, then fuel consumption is conserved by keeping engine running, but device complexity increases
Solution Approach 1:
The brake actuation system is merged with the existing latch mechanism and control arm assembly. The upper arm's movement between operational and stored positions simultaneously engages the latch mechanism for position securing and actuates the brake system through integrated cable linkage. This combination achieves fuel conservation by allowing the engine to remain running while minimizing additional complexity through shared structural elements.
3Ease of operation
If a journal bearing is added for smooth movement between positions, then maneuverability is improved and wear is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The journal bearing serves as an intermediary element between the upper arm and lower arm connection point. It mediates the movement between operational and stored positions by providing a low-friction rotational interface, thereby improving maneuverability and reducing wear on the control arm components. The bearing is integrated into the existing pivot connection, minimizing additional manufacturing complexity while achieving smooth operation.
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
Enhances maneuverability and reduces wear by securing the steering components efficiently, enabling the engine to remain on without restarting, thus conserving fuel.
Implementation Method 1
a biasing member configured to bias the rod into engagement with the first recess to secure the upper arm in the operational position or the second recess to secure the upper arm in the stored position
Implementation Method 2
The journal bearing and the rod are configured to rotate relative to each other when the upper arm is moved between the operational and stored positions
Data Source
AI summary
A control arm for a lawn mower, the control arm including a lower arm having a slot defined therein, an upper arm pivotably coupled to the lower arm, the upper arm having a cam surface defining a first recess and a second recess, and a latch mechanism formed between the upper and lower arms to selectively secure the upper arm in an operational position or a stored position. The latch mechanism includes a rod supported and movable within the slot, and a biasing member configured to bias the rod into engagement with the first recess to secure the upper arm in the operational position or the second recess to secure the upper arm in the stored position.