Lawnmower Push Rod Telescopic Control with Safety Interlock
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Solution Overview
Problem
Existing push rod mechanisms for lawnmowers are either too complex in structure or have low reliability and potential safety hazards, particularly during the folding or telescopic process, which can lead to accidents.
Innovation Solution
A push rod mechanism with a telescopic control assembly that includes a limiting member and an operating handle, allowing the upper push rod to be restricted from stretching or retracting relative to the lower push rod when the handle is in a first position, and enabling telescopic movement when in a second position, integrated with a safety switch to prevent accidental start-ups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety switch mechanism is added to the operating rod to ensure safety during folding or telescopic process, then safety reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the safety switch mechanism with the telescopic control assembly into an integrated unit. The safety switch is incorporated within the telescopic control assembly, allowing the safety function to be achieved without adding a separate, independent safety switch mechanism. This merging approach reduces overall device complexity while maintaining safety reliability.
Solution Approach 2:
The telescopic control assembly serves multiple functions: it controls the telescopic movement of the operating rod, provides safety switching functionality, and integrates the limiting member and operating member mechanisms. By making the telescopic control assembly multi-functional, the patent avoids adding dedicated separate components for safety, thus reducing complexity while improving reliability.
2Volume of moving object
If the operating rod is designed to be foldable or telescopic for storage purposes, then storage efficiency is improved, but safety hazards increase during folding or telescopic process
Solution Approach 1:
The patent implements a safety switch that prevents the lawnmower from starting when the operating rod is in a folded or telescopic state. This preliminary anti-action mechanism detects the unsafe state and blocks operation before any harmful action can occur, thereby reducing safety hazards associated with the foldable telescopic design.
Solution Approach 2:
The safety switch mechanism provides feedback about the state of the operating rod (extended vs. folded/telescopic) to the lawnmower's control system. When the rod is in an unsafe state, the safety switch sends a signal to prevent engine start, creating a feedback loop that continuously monitors and ensures safe operating conditions.
3Reliability
If existing safety switch mechanisms are added to reduce the possibility of accidents, then safety is improved, but structure becomes too complex
Solution Approach 1:
The patent merges the safety switch with the telescopic control assembly, integrating the safety function into the existing control mechanism. This consolidation eliminates the need for separate safety switch components and reduces structural complexity while maintaining safety functionality.
Solution Approach 2:
The telescopic control assembly inherently provides safety functionality through its design. The limiting member and operating member mechanism automatically control the telescopic movement and provide safety switching without requiring additional external safety components. The system serves its own safety needs through its intrinsic design.
Data Source
AI summary
A push rod mechanism includes a lower push rod and an upper push rod relatively stretchable and retractable, and a telescopic control assembly. The lower push rod is provided with a through hole passing through a side wall. The telescopic control assembly includes a limiting member. The limiting member abuts against a side wall of the upper push rod and has a position-limiting state for limiting movement of the upper push rod relative to the lower push rod. The telescopic control assembly includes an operating member capable of pressing against the limiting member, and an operating member for controlling the movement of the operating member. The operating member defines a first position and a second position. In the first position, the operating member keeps the limiting member in the limiting state. In the second position, the operating member allows the limiting member to be released from the position-limiting state.