Four-Point Seat Belt Damping for Controlled Chest Advance
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Solution Overview
Problem
Four-point seat belts in high-performance vehicles provide integral anchoring, which is necessary for stability but poses risks during crashes as the head is not anchored, leading to uncontrolled acceleration and potential injuries.
Innovation Solution
Incorporation of a damping device in the seat belt that activates upon exceeding a predetermined tension force, allowing controlled advancement of the chest and reducing head acceleration through strategically placed and designed seams that gradually extend the seat belt length, thereby mitigating the risk of injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If integral anchoring is used to maintain stability during high-performance driving, then the driver remains steady in the driving position, but the head is not anchored and is entirely subjected to negative acceleration during crashes, leading to uncontrolled forward movement and potential injuries
Solution Approach 1:
The patent incorporates energy-absorbing elements (such as deformable sections, crushable foam, or progressive deformation mechanisms) into the seat belt system that are designed to activate during high-impact events. These elements provide beforehand cushioning by gradually absorbing the kinetic energy of the head and chest during crashes, reducing the peak forces transmitted to the user's body while maintaining the integral anchoring stability during normal high-performance driving
2Ease of operation
If elastic adaptation bands are used to allow user position adjustment, then the driver can change position on the seat based on preferences, but uncontrolled movement occurs during strong longitudinal and lateral accelerations, compromising vehicle performance
Solution Approach 1:
The patent employs dynamic restraint mechanisms that adapt the seat belt's restraining characteristics based on the driving conditions. During normal operation, the system allows controlled movement and position adjustment. During high-g maneuvers or crashes, the system automatically increases restraint force through mechanisms such as pre-tensioners, load limiters, or progressive engagement of anchoring points, thereby maintaining driver stability without completely eliminating adjustability
3Reliability
If four-point seat belts with integral trunk anchoring are used, then the driver is securely anchored to the seat, but the complexity of the seat belt system increases compared to three-point seat belts
Solution Approach 1:
The patent integrates multiple functions into a unified seat belt system that combines the four-point anchoring configuration with energy-absorbing elements and dynamic restraint mechanisms in a coordinated manner. By merging the integral trunk anchoring with progressive energy absorption and adaptive tensioning in a single integrated system, the patent achieves high reliability without proportionally increasing complexity, as the various functions work together synergistically rather than as separate additive components
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
The solution ensures the safety of users by controlling head movement during accidents while maintaining the stability provided by traditional four-point seat belts, reducing the risk of injuries and maximizing performance without compromising manufacturing simplicity or cost-effectiveness.
Implementation Method 1
a damping device (19) which is configured to be activated upon exceeding a first predetermined value (TS') of a tension force (F) imparted by the user (U) to the seat belt (5)
Data Source
AI summary
Four-point seat belt comprising two thoracic branches configured to anchor the chest of a user to a backrest of a vehicular seat; two abdominal branches configured to girdle and anchor the waist of the user to the vehicular seat; at least one damping device configured to be activated upon exceeding a first predetermined value of a tension force imparted by the user to the belt; wherein the damping device is configured to cause, upon its activation, a controlled advancement of the chest of the user while limiting the acceleration of the head of the user.