Fall Arrest Trigger Gear for Consistent Rope Blocking
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Solution Overview
Problem
Existing fall arrest devices are not fully reproducible and have a variable time lag for activation due to dependence on the position of centrifugal weights, leading to inconsistent performance in blocking ropes at a threshold speed.
Innovation Solution
The introduction of a release gear with an outer toothing that engages the activation lever, combined with a catch section and catch roll mechanism, allows for independent activation of the blocking mechanism from the angular position of the centrifugal weights, facilitated by a larger number of teeth and a spring-actuated centrifugal weight holder, ensuring fast and reliable triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centrifugal weights are arranged eccentrically on a centrifugal weight holder to engage an activation lever, then the blocking mechanism can be triggered when speed reaches threshold value, but the activation time varies depending on the angular position of the centrifugal weights
Solution Approach 1:
A release gear with toothing is introduced as an intermediary mechanism between the centrifugal weights and the activation lever. The actuator members of the centrifugal weights engage with the toothing of the release gear, which then translates the centrifugal force into consistent rotational movement regardless of the initial angular position of the weights. This mediator ensures that the activation lever is triggered at a consistent time after the threshold speed is reached, eliminating the variability caused by different starting positions of the centrifugal weights.
2Ease of operation
If the blocking mechanism activation depends on the angular position of centrifugal weights, then the mechanism can be triggered, but the activation is not reproducible across different positions
Solution Approach 1:
The release gear with toothing acts as a mediator that decouples the triggering action from the angular position of the centrifugal weights. When any of the actuator members engage the toothing, the gear rotates in a predictable manner to activate the blocking mechanism, ensuring reproducible behavior regardless of which weight or at what angular position the triggering begins.
Solution Approach 2:
The release gear is pre-configured with toothing that guides the activation process. Once any actuator member engages the toothing, the gear's rotational path is predetermined, ensuring that the blocking mechanism activates after a consistent angular displacement regardless of the initial position of the centrifugal weights.
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 ensures a consistent and rapid activation of the blocking mechanism, independent of the device's position, resulting in a highly reliable and reproducible fall arrest performance.
Implementation Method 1
the at least one centrifugal weight is held acting against a restoring force, the at least one centrifugal weight being movable between an inactive position and a trigger position for triggering the activation lever when the speed reaches the threshold value
Data Source
AI summary
A fall arrest device for blocking a rope when a relative speed between the rope and the device reaches a threshold value comprises a blocking mechanism for blocking the rope, and a trigger mechanism configured for triggering an activation lever of the blocking mechanism for activating the blocking mechanism for blocking the rope when the speed reaches the threshold value, wherein the trigger mechanism comprises a drive axis rotated by the rope upon relative movement between the rope and the fall arrest device, the drive axis carrying a centrifugal weight holder, wherein at least one centrifugal weight is held acting against a restoring force of a spring, wherein the at least one centrifugal weight is movable between an inactive position and a trigger position for triggering the activation lever when the speed reaches the threshold value. The centrifugal weight holder is arranged rotatably relative to a release gear that comprises a toothing engagable by an actuator member of the at least one centrifugal weight, when the at least one centrifugal weight is in the trigger position.