Forward-Reverse Switching Lever Grip Design
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Solution Overview
Problem
Conventional traveling vehicles with forward-reverse switching levers suffer from inadequate grip force and unfavorable operability due to the need for a two-step operation, making reliable switching between forward, neutral, and reverse positions difficult and cumbersome.
Innovation Solution
The design incorporates a grip with a protruding portion that allows two-finger operation, featuring side faces that gradually approach each other downward, enabling natural upward and rearward forces to facilitate lever movement without a conscious pulling-up operation, enhancing operability and grip force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a convex portion is provided on the edge of the bottom face of the grip for finger hooking, then the grip can be held, but sufficient holding force cannot be obtained
Solution Approach 1:
The protruding portion is designed with curved side faces that gradually approach each other downward, forming a V-shaped or wedge-like curved surface. This curvature allows the operator's finger to naturally apply force along the inclined surface, generating both upward pulling force and rearward swinging force components, thereby achieving sufficient holding force and operational force multiplication.
2Reliability
If a two-step operation (pulling up and swinging) is required for lever switching, then position control can be achieved, but operability becomes unfavorable
Solution Approach 1:
The protruding portion's inclined side faces merge the pulling-up motion and swinging motion into a single integrated finger action. When the operator presses the inclined surface with their finger, the force is naturally decomposed into upward and rearward components, simultaneously achieving both the pulling-up and swinging operations in one continuous motion, thereby improving operability while maintaining reliable position control.
Solution Approach 2:
The inclined geometry of the protruding portion automatically generates the necessary force components without requiring conscious control from the operator. The finger pressure on the inclined surface self-generates both the upward pulling force and the rearward swinging force, making the two-step operation occur naturally through a single intuitive action, thus enhancing ease of operation.
3Ease of manufacture
If the grip structure is simplified to improve manufacturing, then operational reliability may be compromised
Solution Approach 1:
The grip is segmented into a base portion and a protruding portion that protrudes downward from the base. This segmentation allows the protruding portion to be designed with the specific inclined geometry needed for reliable operation, while the base portion maintains structural integrity. The protruding portion can be manufactured as an integrated feature or added component without significantly increasing overall manufacturing complexity.
Data Source
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AI summary
A traveling vehicle (1) is provided with a body (2) that can travel, a steering wheel (19) that is provided to the body and can rotate, and a forward-reverse switching lever (21) that can switch to forward, neutral, and reverse positions, wherein the forward-reverse switching lever has a lever main body (30) that can be pulled up at the neutral position and can swing forward or rearward in a pulled-up state and a grip (31) mounted to an upper portion of the lever main body; the grip has a base portion (40) having an upper face (47) and a protruding portion (41) protruding downward from the base portion; and the protruding portion has a distal face (42) provided on an opposite side of a rotating-shaft side of the steering wheel, one side face (44) that is provided on one side in a swinging direction and is continuous with the distal face, and another side face (45) that is provided on another side in the swinging direction and is continuous with the distal face, the one side face and the other side face being formed so as to gradually approach each other in heading downward. This provides a traveling vehicle provided with a forward- reverse switching lever that can reliably perform a switching operation of forward, neutral, and reverse positions and has excellent operability.