Vehicular Seat Back Interference Lever for Slippage Prevention
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Solution Overview
Problem
Existing vehicular seats face issues with maintaining the seat back in a forward inclining attitude due to variations in pressure angles between the stopper and switch lever, leading to potential slippage or excessive engagement force, which affects the stability of the seat back's position.
Innovation Solution
A vehicular seat with a restricting falling down mechanism featuring an interference lever that adjusts the pressure angle between the seat back and the switch lever, ensuring the seat back remains in a forward inclining attitude by being squeezed between members of the seat back and cushion, thereby maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stopper and switch lever are used to restrict the seat back from falling down, then the seat back can be maintained in a forward inclining attitude, but the pressure angle between the stopper and switch lever varies due to shape dispersion, causing slippage or excessive engagement force
Solution Approach 1:
The interference lever is introduced as an intermediary component between the stopper and the switch lever. When the seat back falls forward, the stopper contacts the interference lever, which then contacts the switch lever. This intermediary mechanism ensures that the pressure angle between the interference lever and switch lever is substantially zero, eliminating the problem of pressure angle variation caused by shape dispersion of the stopper and switch lever, and preventing both slippage and excessive engagement force
Solution Approach 2:
The invention changes the pressure angle parameter by introducing the interference lever. The interference lever is designed to contact the switch lever at a point where the pressure angle is substantially zero, regardless of the shape variations of other components. This parameter change ensures consistent and reliable engagement without slippage or excessive force
2Ease of operation
If the pressure angle between stopper and switch lever is larger than design value, then slippage occurs and seat back cannot be maintained, but if the pressure angle is smaller than design value, then excessive engagement force is required to release the switch lever
Solution Approach 1:
The interference lever serves as a mediator that controls the engagement force between the stopper and switch lever system. By positioning the interference lever to contact the switch lever at a pressure angle of substantially zero, the engagement force is optimized to be sufficient for maintaining the seat back position but not excessive for releasing the switch lever, improving ease of operation
3Adaptability or versatility
If multiple connection methods are used for seat back to seat cushion, then adaptability is improved, but the pressure angle dispersion increases leading to unreliable seat back restriction
Solution Approach 1:
The interference lever acts as a standardized intermediary component in the connection between the seat back and seat cushion. Regardless of the specific connection method used, the interference lever ensures that the pressure angle between it and the switch lever is substantially zero, maintaining reliable seat back restriction while allowing adaptability in connection methods
Data Source
AI summary
One aspect of the present invention can include a vehicular seat including a seat cushion, a seat back inclinably attached to the seat cushion, and a restricting falling down mechanism. The restricting falling down mechanism restricts the seat back from falling down forward when the seat back falls down from a substantially erected state so that the seat back is maintained in a forward inclining attitude. The restricting falling down mechanism comprises an interference lever pivotably attached to the seat cushion. When the seat back falls down forward from the substantially erected state, the interference lever is squeezed between a member on a side of the seat back and a member on a side of the seat cushion. And the seat back is restricted from falling down forward by the member on the side of the seat cushion via the interference lever.