Forklift Armrest Steering with Position Detection
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Solution Overview
Problem
Counterbalance type forklifts face challenges in improving front visibility, and when mini-steering is introduced, ensuring safety equivalent to or higher than with a steering wheel in front of the driver's seat is necessary.
Innovation Solution
A forklift design featuring an armrest with a movable mechanism, a steering member, a control unit, and detection units to manage the steering and cargo handling operations based on the armrest's position and operator presence, ensuring safe and controlled vehicle operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a steering wheel in front of the driver's seat is abolished and mini-steering is provided at a location other than the front, then front visibility is improved, but safety may be compromised
Solution Approach 1:
The patent introduces an armrest as an intermediary carrier for the mini-steering, positioning it at the driver's side rather than in front of the seat. This intermediary structure enables the steering function to be relocated while maintaining driver control and safety, resolving the contradiction between improved visibility and safety concerns.
Solution Approach 2:
The patent replaces the traditional mechanical steering wheel system with a by-wire mini-steering system mounted on the armrest. This substitution allows the steering function to be decoupled from the traditional front-positioned wheel, enabling improved visibility while maintaining safety through electronic control mechanisms.
2Ease of operation
If mini-steering is provided on a movable armrest, then ease of operation is improved, but device complexity increases due to detection units and control mechanisms
Solution Approach 1:
The armrest serves multiple functions: it acts as a structural support element, a positioning mechanism for the mini-steering, and incorporates detection units to monitor its position. This multi-functionality reduces the need for separate components, managing complexity while improving ease of operation.
Solution Approach 2:
The armrest detection unit automatically monitors the armrest position and provides feedback to the control unit, enabling the system to self-regulate steering operations based on armrest position. This self-service mechanism simplifies control while maintaining operational ease.
3Reliability
If the armrest detection unit detects non-operation position, then safety is improved by preventing unauthorized operations, but productivity decreases due to operational restrictions
Solution Approach 1:
The system preemptively prevents unauthorized or unsafe operations by detecting armrest position before allowing steering commands to execute. This preliminary safety check blocks operations when the armrest is in non-operation positions, ensuring safety while maintaining productivity during proper operation.
Solution Approach 2:
The armrest detection unit provides continuous feedback to the control unit about armrest position, enabling real-time adjustment of operational permissions. This feedback mechanism ensures safety restrictions are applied only when necessary, maintaining productivity during legitimate operations while preventing unsafe actions.
Data Source
AI summary
A forklift includes: an armrest that is provided at a driver's seat of a vehicle and is moved between a non-operation position and an operation position by a movable mechanism; a steering member that outputs an operation signal in response to a steering operation; a steering device that changes a steering angle of steering wheels of the vehicle; a control unit that changes the steering angle according to the operation signal; and an armrest detection unit that detects whether the armrest is at the non-operation position or at the operation position in which when the armrest detection unit detects that the armrest is at the non-operation position, the control unit controls the steering device or the steering member such that the steering device does not change the steering angle even if the steering member is operated.