Eccentric Riveting Pin for Compact Seat Belt Buckle
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Solution Overview
Problem
Existing seat belt buckles are too large in the direction of push button displacement, compromising stability and safety while attempting to minimize size.
Innovation Solution
The riveting pin is offset eccentrically towards the apex of the arcuate contact surface, allowing for a smaller seat belt buckle design by optimizing the positioning of the riveting pin relative to the contact surface, incorporating a spring-loaded locking mechanism and lever system, and using a plate-shaped base body with a recess for assembly precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the riveting pin is positioned at the center of the contact projection, then the structural symmetry and manufacturing simplicity are improved, but the buckle dimension in the push button displacement direction increases
Solution Approach 1:
The riveting pin is positioned eccentrically relative to the contact projection, creating an asymmetric structure. This asymmetric positioning allows the buckle dimension in the push button displacement direction to be reduced while maintaining the functional integrity of the cable contact surface and the structural stability of the fastening device.
2Reliability
If the contact surface radius is increased to improve cable contact stability, then the cable contact stability is improved, but the buckle size increases
Solution Approach 1:
The solution moves the optimization from the radial dimension (contact surface radius) to the axial dimension (riveting pin offset distance). By positioning the riveting pin eccentrically along the axial direction, the cable contact stability is maintained through the unchanged contact surface geometry, while the overall buckle size is reduced by optimizing the axial positioning of the riveting pin.
3Length of stationary object
If the riveting pin is offset eccentrically to reduce buckle size, then the buckle dimension in push button direction is reduced, but the manufacturing precision requirement increases
Solution Approach 1:
The eccentric offset of the riveting pin creates a localized geometric feature with defined dimensions. By specifying the offset distance as a fixed dimensional parameter, the manufacturing precision requirement is localized to this specific feature, allowing other parts of the component to maintain standard manufacturing tolerances. This localized precision approach reduces the overall manufacturing complexity compared to requiring high precision throughout the entire component.
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
This design reduces the buckle's size in the push button direction while maintaining stability and safety, allowing for more compact seating and easier assembly with reduced weight and cost-effective manufacturing.
Implementation Method 1
a spring-loaded locking mechanism for locking a belt tongue inserted into a lock housing
Implementation Method 2
a spring-loaded lever that interacts with the locking pin... the lever is pivotably mounted on the ejector
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a belt buckle (1) for a safety belt system having a spring-loaded locking mechanism (2) for locking A belt tongue (4) pushed into a buckle housing (3), and having a push-button (5) displaceably guided under spring action in the buckle housing (3) for the loading of the locking mechanism (2) required to unlock the belt buckle (1), a cable (6) fastening the belt buckle (1) to a vehicle being fastened by means of a fastening device (7) riveted to the buckle housing (3), the fastening device (7) comprising a plate-like base (8), from the base surface (9) of which a contact projection (11) having a radial arcuate contact surface (12) for a loop (13) formed by the cable (6) protrudes in an axial direction, a riveting pin (14) protruding in the axial direction from the contact projection (11), characterized in that the riveting pin (14) is offset eccentrically in relation to a vertex (15) of the arcuate contact surface (12) of the contact projection (11) around which the cable (6) wraps, wherein a distance (16) of the vertex (15) of the contact surface (12) to a center (17) of the riveting pin (14) is smaller than a radius of curvature (18) of the contact surface (12) at the vertex (15). By means of the invention belt buckles (1) having a small extent in the displacement direction of the push-button button can be constructed due to the radial eccentric offset of the riveting pin (14) in the direction of the vertex (15) of the contact surface (12).