Surfacing Machine Throttle Return Mechanism for Clutch Slip Prevention
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Solution Overview
Problem
Surfacing machines, such as floor grinders, often experience clutch slippage due to improper engagement, leading to frictional heat and potential damage, and operators tend to maintain engine speeds in undesirable ranges, affecting machine longevity and efficiency.
Innovation Solution
A throttle control mechanism with configurable throttle positions and resilient biasing members, including extension springs and a dead-man switch, that automatically reverts to an idle position when released, preventing prolonged operation in undesired engine speed ranges and reducing clutch slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a clutch arrangement is used to connect the engine to the work tool, then the machine can operate flexibly, but clutch slippage occurs generating frictional heat that may damage the clutch arrangement permanently
Solution Approach 1:
The throttle control mechanism is configured to automatically revert to idle position when released, preventing the engine speed from entering the harmful range before clutch slippage can occur. This preliminary protective action eliminates the need for operator intervention and prevents cumulative damage to the clutch arrangement over time
Solution Approach 2:
The resilient biasing member provides self-acting protection by automatically returning the control member to the idle position when released. The system serves itself by using the spring's stored energy to prevent harmful operation conditions without requiring external control or monitoring systems
2Ease of operation
If the operator can freely control the throttle, then operational flexibility is improved, but the operator may maintain engine speeds in undesired ranges affecting machine longevity
Solution Approach 1:
The resilient biasing member creates a preliminary counteracting force that automatically pushes the control member away from the harmful engine speed range toward the idle position. This built-in anti-action prevents prolonged operation in undesired ranges while still allowing temporary operator control when the throttle is actively held
3Device complexity
If a simple throttle control is used, then device complexity is reduced, but the control mechanism may not effectively prevent operation in undesired engine speed ranges
Solution Approach 1:
The resilient biasing member creates a self-acting system that automatically returns the control member to the safe idle position when released. This simple yet effective mechanism provides reliable protection against harmful operation without requiring complex electronics, sensors, or control systems
Solution Approach 2:
The spring-loaded biasing member acts as a protective cushion that continuously exerts force to keep the control member in the safe idle position. This beforehand cushioning ensures that even if the operator releases the throttle unintentionally or the machine is dropped, the control member will return to the protected position
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
The throttle control mechanism prolongs machine life, enhances operational efficiency, and prevents clutch damage by discouraging operation in undesirable engine speed ranges, while being robust, durable, and cost-effective.
Implementation Method 1
The control member is arranged biased towards an idle throttle position when released from the first throttle position
Implementation Method 2
the resilient biasing member may, e.g., comprise a primary extension spring configured to pull the control member towards the idle throttle position
Implementation Method 3
the control member is arranged to be tensely attached to a throttle actuator of the surfacing machine via a tensile engagement member
Implementation Method 4
This slippage generates frictional heat which may damage the clutch arrangement permanently
Data Source
AI summary
A throttle control mechanism for a surfacing machine, the control mechanism comprising a control member (310) arranged movable (M, D) in a support structure (320), wherein the control member (310) is arranged to be tensely attached to a throttle actuator (330) of the surfacing machine via a tensile engagement member (340), wherein the control member (310) is arranged to be held fixed in the support structure in at least a first throttle position (350), where the control member is arranged biased towards an idle throttle position (370) when released from the first throttle position (350), and wherein the first throttle position (350) and the idle throttle position (370) are configurable to provide an engine speed margin with respect to a clutch engagement engine speed range of the surfacing machine.