Fall Arrester Lever Cam Braking Mechanism
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Solution Overview
Problem
Existing fall arrester designs, particularly manual devices, pose a dropped objects hazard due to the need for detachment from the user's carabiner when attaching to a backup rope and lack efficient braking mechanisms, especially during rapid descents.
Innovation Solution
A fall arrester with a pivotally coupled lever and primary cam that engages upon user descent, featuring a secondary cam for maintaining contact and a tow cam for manual towing, along with an inertial cam for enhanced braking, and a mechanical fuse to prevent over-pulling, ensuring safe operation in both automatic and manual modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fall arrester uses a manual device design with detachable carabiner connection, then the device can be attached to backup rope, but it creates dropped objects hazard when detached
Solution Approach 1:
The patent combines the user connection (carabiner) and the backup rope connection (fall arrester) into a single integrated unit. The fall arrester remains permanently attached to the user's carabiner, eliminating the need for detachment operations that create dropped objects hazards, while still allowing proper engagement with the backup rope.
2Reliability
If the fall arrester uses rapid descent braking mechanism, then it can arrest fall effectively, but it requires complex cam and lever systems
Solution Approach 1:
The patent extracts the inertial cam mechanism as a separate, independently pivoting component from the main lever assembly. This inertial cam is specifically designed to engage during rapid descent conditions, providing automatic initiation of braking action without requiring complex control systems or multiple interconnected levers.
3Ease of operation
If the fall arrester allows manual towing during descent, then it provides operational flexibility, but it requires additional cam mechanisms
Solution Approach 1:
The patent implements a dynamically adjustable tow cam mechanism that can pivot between different positions. The tow cam is biased to maintain contact with the lever for normal operation, but can be manually overridden to disengage and allow towing operations, then automatically return to its biased position when towing is complete.
4Stability of the object's composition
If the secondary cam maintains constant contact with rope, then it holds fall arrester at required position, but it increases friction and energy loss
Solution Approach 1:
The secondary cam is designed with a biasing mechanism that allows it to self-adjust its contact pressure with the rope. It maintains just enough contact pressure to hold the fall arrester at the required position during normal descent, but automatically reduces this pressure when not actively engaged, minimizing unnecessary friction and energy loss.
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 fall arrester effectively brakes the rope during descents, eliminates dropped object hazards, allows for safe towing, and deactivates the tow cam to prevent over-pulling, providing reliable and user-friendly operation in various modes.
Implementation Method 1
the lever pivots to effect braking of rope passing through the fall arrester between the primary cam and the body
Implementation Method 2
an inertial cam pivotally coupled to the lever proximate the primary cam and configured on rapid descent of the user to pivot into contact with the rope to initiate pivotal movement of the lever
Implementation Method 3
a tow cam movably coupled to the body and configured to contact the lever to pivot it and release the primary cam from the rope to permit manual towing of the fall arrester along the rope
Implementation Method 4
a secondary cam and lever which connects to the user's carabiner so that rocking of the housing is promoted by the secondary cam which frictionally engages the backup rope
Data Source
AI summary
The present invention relates broadly to a fall arrester (10) attached to a user's harness via a coupling arrangement (6). The fall arrester (10) is designed to be attached to a backup rope or safety line (12). The fall arrester 10 ( )comprises a body (14), and a lever (16) pivotally coupled to the body (14). The lever (16) includes a primary cam (18) which is arranged to co-operate with the coupling arrangement (6). In operation, descent of the user urges the coupling arrangement (6) into contact with the lever 16 which pivots to effect braking of the safety line (12) between the body (14) and the primary cam (18). Some preferred embodiments include an inertial cam to initiate pivotal movement of the lever for braking of the rope with the primary cam; a tow cam connected to a tow line which includes a mechanical fuse; a secondary cam connected to the lever whereby panic gripping the rope and the coupling toward one another promotes braking of the rope between the primary cam and the body; an accelerator element to accelerate contact of the coupling with the lever; and an inverted cam to ensure correct orientation of the fall arrester.