Anchor Position Adjustment Device Lock Pin Inhibition Surface
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Solution Overview
Problem
Existing anchor position adjustment devices may disengage during significant vehicle vibrations due to inertial forces overcoming the biasing force of a compression coil spring, leading to unintended movement of the moving member with respect to the guide rail.
Innovation Solution
The anchor position adjustment device incorporates a guide rail with engagement recess portions, a moving member with a lock pin biased by a spring, a release pin, and an operation member with a release inclination surface and inhibition surface. The lock pin engages with recess portions due to spring bias, restricting movement, and the release pin guides the lock pin out upon sliding, while the inhibition surface prevents disengagement during vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock pin is biased by a compression coil spring to engage with a recess portion, then the moving member is restrained from moving, but during significant vibration the lock pin may be pulled out due to inertial force
Solution Approach 1:
The operation frame applies preliminary anti-action by using the inclined surface to actively push the lock pin into the recess portion during normal operation, counteracting the biasing force of the compression coil spring. This preliminary engagement action ensures positive locking before vibration occurs, creating a pre-engaged state that resists subsequent vibration-induced disengagement attempts.
Solution Approach 2:
The inclined surface of the operation frame creates a curved geometric path for the lock pin during engagement. This curvature allows the lock pin to be gradually guided into the recess portion, ensuring smooth and reliable engagement that can withstand subsequent vibrational forces. The geometric shape transforms the engagement process into a controlled mechanical action.
2Ease of operation
If the lock pin is easily engaged with the recess portion, then the moving member can be readily restrained, but the lock pin may be accidentally pulled out during vibration
Solution Approach 1:
The engagement mechanism is segmented into distinct functional components: the operation frame with inclined surface for engagement, the compression coil spring for maintaining force, and the T-shaped structure with perpendicular surfaces for directional control. This segmentation allows each component to specialize in its function, ensuring easy engagement through the inclined surface while reliability is maintained through the combined action of all segments.
Solution Approach 2:
The T-shaped structure introduces asymmetry with its perpendicular surfaces, creating different engagement characteristics for different directions. The asymmetric geometry ensures that the lock pin can be easily pushed into the recess portion along the inclined surface direction, while accidental pull-out in opposite directions is prevented by the perpendicular blocking surfaces.
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 configuration effectively prevents the moving member from moving with respect to the guide rail during significant vibrations, ensuring the anchor position remains stable and secure.
Implementation Method 1
a biasing member biasing the lock pin in an inserting direction of the lock pin with respect to the engagement recess portions
Implementation Method 2
a release pin extending in a direction intersecting with the inserting/pulling direction from the lock pin
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An anchor position adjustment device 1 includes a guide rail 2 having a plurality of engagement recess portions 26 formed to be arranged in a first direction D1, a moving member 3 attached to the guide rail 2 in a slidable manner in the first direction D1, a lock pin 5 provided in the moving member 3 such that the lock pin 5 is able to move in an inserting/pulling direction D2, a first biasing member 7 biasing the lock pin 5 in an inserting direction of the lock pin 5 with respect to the engagement recess portions 26, a release pin 8 extending from the lock pin 5, and an operation member 9 attached to the moving member 3 in a slidable manner. The operation member 9 has a release inclination surface 95 guiding the release pin 8 in a pulling direction of the lock pin 5 with respect to the engagement recess portions 26 in accordance with sliding of the operation member 9, and a release inhibition surface 97 inhibiting the lock pin 5 from being pulled out from the engagement recess portion 26 in a pre-slide state.