Vehicle Walk-In Seat Double-Locking Mechanism for Collision Restraint
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Solution Overview
Problem
Existing walk-in seat locking devices in vehicles are vulnerable to unlocking due to external forces, such as rear-end collisions, which can lead to sudden movement of the seat and potential injury to passengers.
Innovation Solution
A walk-in seat locking device with a double-locking mechanism using sector gears, locking cams, and springs to prevent unlocking under external impact, ensuring the locked state is maintained during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single locking device is used to lock the rear link, then the device complexity is reduced, but the reliability of the locking mechanism deteriorates under external force such as rear-end collision
Solution Approach 1:
The locking mechanism is divided into two independent locking devices (first locking device and second locking device) that separately engage with the rear link. Each locking device operates independently through its own cam and locking member, providing redundant protection against external forces while maintaining manageable structural complexity
Solution Approach 2:
The patent implements a dual locking system that provides beforehand protection against external forces such as rear-end collisions. By having two independent locking mechanisms engaged with the rear link, the system pre-establishes redundant safety measures that prevent accidental unlocking under impact conditions
2Reliability
If the locking device is made more robust to prevent unlocking under external force, then the reliability improves, but the device complexity increases
Solution Approach 1:
The robust locking mechanism is achieved by segmenting the system into two independent locking devices rather than creating one complex oversized locking mechanism. Each locking device consists of a cam, locking member, and spring assembly that independently secures the rear link, providing enhanced reliability through redundancy while keeping individual component complexity manageable
Solution Approach 2:
The patent applies local quality by providing locking protection at two distinct locations along the rear link. Each locking device engages with a separate portion of the rear link structure, creating localized securement points that collectively enhance overall system reliability without requiring a uniformly complex design throughout the entire mechanism
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
Prevents the unlocking of the seat locking mechanism during collisions, thereby preventing injury to passengers by maintaining the locked state and allowing safe operation of the seat mechanism.
Implementation Method 1
a rear link having a structure including a first sector gear, with one end portion thereof being hinge-fastened to a rear portion of a seat cushion frame and the other end thereof being hinge-fastened to a rear portion of a seat rail, a locking link including a second sector gear engageable with the first sector gear
Implementation Method 2
a lever having one end portion to which a cable is connected and the other end portion hinge-fastened to the seat cushion frame, a first locking cam having one end portion coaxially connected to the lever and including a first locking end provided on the other end portion to restrain the locking link, and a second locking cam having one end portion coaxially connected to the lever and the first locking cam
Implementation Method 3
The walk-in seat locking device may further include a spiral spring having one end portion connected to a predetermined position of the rear link and the other end portion connected to the seat cushion frame in order to provide elastic restoring force to tilt the seat cushion frame with respect to the rear link
Implementation Method 4
The first locking cam may include a pivot restraining pin on the first locking end, and the second locking cam includes a pivot restraining slot in the second locking end, the slot being configured such that the pin is inserted thereinto
Data Source
AI summary
An embodiment walk-in seat locking device for a vehicle includes a rear link including a first sector gear, the rear link having a first end portion hinge-fastened to a rear portion of a seat cushion frame and a second end portion hinge-fastened to a rear portion of a seat rail, a locking link including a second sector gear engageable with the first sector gear, wherein the second sector gear is on a rear portion of the locking link and is hinge-fastened to the seat cushion frame, a lever having a first end portion to which a cable is connected and a second end portion hinge-fastened to the seat cushion frame, a first locking cam having a first end portion coaxially connected to the lever, and a second locking cam having a first end portion coaxially connected to the lever and the first locking cam.