Belay Descender with Guide Ramp for Automatic Rope Locking
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Solution Overview
Problem
Conventional belay descender devices lack an effective anti-panic function that automatically relocks the rope in case of uncontrolled descent, compromising user safety.
Innovation Solution
The belay descender device incorporates transmission means, such as a drive rod or pivot-pin, that collaborate with a guide ramp to interrupt the mechanical link with the cam, enabling automatic relocking beyond a specific unlocking position, and allows manual re-establishment of the mechanical link for direct unlocking without gearing-down.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operating lever maintains a permanent mechanical link with the cam through the bearing pin pressing on the cam wall, then direct and rapid movement of the cam is achieved for complete unlocking, but the device loses automatic relocking capability in panic situations
Solution Approach 1:
The patent applies dynamics by making the mechanical link between the lever and cam conditional rather than permanent. The bearing pin dynamically transitions between two states: pressed against the cam wall for direct unlocking, and disengaged from the cam wall for automatic relocking. This dynamic switching resolves the contradiction by allowing both rapid unlocking and panic protection depending on the operational phase.
Solution Approach 2:
The bearing pin serves as an intermediary element that mediates the interaction between the lever and cam. By positioning the bearing pin between these two components and allowing it to press against the cam wall only in specific zones, it enables direct unlocking when needed while permitting automatic relocking when the pin disengages from the cam wall, thus resolving the contradiction between unlocking speed and safety.
2Strength
If the bearing pin presses continuously on the cam wall, then complete mechanical linkage is maintained for direct cam movement, but the device cannot provide anti-panic automatic relocking
Solution Approach 1:
The patent segments the interaction zone between the bearing pin and cam wall into distinct areas: a first area where the pin presses on the cam wall for strong mechanical linkage and direct cam movement, and a second area where the pin is disengaged from the cam wall to allow automatic relocking. This spatial segmentation resolves the contradiction between maintaining strong mechanical linkage and enabling panic protection.
Solution Approach 2:
The patent applies local quality by giving different functional characteristics to different zones of the cam wall. The first zone provides a pressing surface for strong mechanical coupling, while the second zone provides a disengaged state for automatic relocking. This local differentiation allows the same bearing pin-cam interface to provide both strong linkage and panic protection depending on the operational zone.
3Productivity
If the cam is fully unlocked for fluid descent, then rope movement is unrestricted for speed, but the device loses automatic relocking capability
Solution Approach 1:
The patent uses dynamics to create a conditional mechanical link that adapts to the operational state. During controlled descent, the bearing pin presses on the cam wall allowing full unlocking and fluid rope movement. In panic situations, the pin disengages from the cam wall enabling automatic relocking. This dynamic adaptation resolves the contradiction between descent fluidity and automatic relocking.
Data Source
AI summary
A belay descender device for a rope comprising a cam mounted rotating on a fixed flange to perform locking of the rope when said rope is under tension, and a lever articulated on the cam to perform progressive unlocking of the rope with a geared-down effect at the beginning of unlocking travel of the lever. The operating lever comprises transmission means collaborating with a guide ramp of the flange to interrupt the mechanical link with the cam after an intermediate position of the lever has been passed resulting in freeing from said ramp outside the gearing-down area. The end of the guide ramp of the flange corresponds to the anti-panic position of the transmission means, enabling automatic locking of the cam as soon as the gearing-down area has been passed.