Tiller Arm Holding Device for Industrial Truck Speed Control
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Solution Overview
Problem
Existing tiller guided industrial trucks face discomfort during transitions from coasting operation to high speed operation due to the tiller arm being released even for short high speed operations, which compromises safety and operational efficiency.
Innovation Solution
A holding device for the tiller arm is activated via an actuation element, allowing the tiller arm to remain in a snap-in position between horizontal and vertical positions, with a dead man's switch activated only when both the travel speed controller and high speed travel button are actuated, ensuring safety and comfort during high speed operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tiller arm is released during high speed operation, then the dead man's switch can be activated for safety, but the tiller arm cannot be held in position causing operational discomfort and reduced efficiency
Solution Approach 1:
The holding device dynamically adjusts the tiller arm positioning based on operational mode. During coasting operation, the device holds the tiller arm in a non-vertical position to enable smooth transitions. During high speed operation, the device releases the tiller arm to allow dead man's switch activation while maintaining operational comfort through controlled positioning.
Solution Approach 2:
The system changes the state of the holding device based on operational parameters. When transitioning from coasting to high speed mode, the holding device changes from an engaged state (holding tiller arm) to a disengaged state (releasing tiller arm), allowing the dead man's switch to function while maintaining operational efficiency.
2Productivity
If the tiller arm is held in position during high speed operation, then operational efficiency is improved, but the dead man's switch cannot be activated compromising safety
Solution Approach 1:
The holding device dynamically responds to operational mode changes. During high speed operation, it releases the tiller arm to enable dead man's switch activation, ensuring safety while maintaining operational efficiency through controlled positioning and smooth transitions between modes.
Solution Approach 2:
The system utilizes parameter changes in operational mode to control the holding device state. When high speed mode is activated, the holding device transitions from engaged to disengaged, allowing both safety requirements and operational efficiency to be satisfied simultaneously.
3Reliability
If the tiller arm is released for short duration high speed operations, then safety is maintained, but operational comfort and efficiency are reduced due to repeated releasing and re-engaging
Solution Approach 1:
The holding device is pre-configured to respond automatically to high speed operation activation. When high speed mode is initiated, the device preliminarily prepares by releasing the tiller arm in advance, avoiding repeated releasing and re-engaging cycles, thus reducing transition time and improving operational smoothness.
Solution Approach 2:
The holding device maintains continuous useful action by smoothly transitioning between engaged and disengaged states based on operational mode. During short duration high speed operations, the device remains disengaged throughout the operation, eliminating repeated transitions and maintaining operational continuity and efficiency.
Data Source
AI summary
A tiller guided industrial truck having a steered wheel, a tiller arm, a travel speed controller, an actuating unit, a hold device, and a high speed travel switch. The tiller arm is pretensioned toward a vertical or near vertical position. The hold device limits a maximum travel speed to a walk along speed when activated and provides a snap-in position for the tiller arm in which the tiller arm is held. Further, the industrial truck has a circuit that initializes a braking process when the travel speed controller is not actuated while the high speed travel switch is activated.