Pole Strap Assembly Automatic Fall Braking via Elastic Loop
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Solution Overview
Problem
Conventional pole strap assemblies for linemen lack effective braking mechanisms that ensure secure engagement with the utility pole during falls, as biting elements only function when in contact with the pole surface, and existing solutions are not universally effective.
Innovation Solution
A pole strap assembly featuring a cross strap with slide members and bias members that form a closed loop around the pole, utilizing elastic tension to automatically engage the pole in case of a fall, along with adjustable strap assemblies and protective covers for the bias members, ensuring secure frictional engagement and user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biting elements are positioned to engage the pole surface, then braking effectiveness is improved, but the device complexity increases due to the need for cross-strap and closed loop mechanisms
Solution Approach 1:
The patent combines the outer strap and cross-strap into a unified closed loop structure that encircles the pole. The slide members with gaffs are integrated into this loop, allowing the braking elements to engage the pole surface automatically when the loop is tightened during a fall, eliminating the need for separate braking mechanisms.
Solution Approach 2:
The elastic tensile member is pre-configured within the closed loop structure, storing potential energy that automatically activates the braking mechanism when needed. The slide members are pre-positioned with gaffs oriented to engage the pole surface, so that upon tightening during a fall, the biting elements are immediately ready to engage without requiring additional activation steps.
2Reliability
If cross-strap is used to form closed loop for pole engagement, then safety during falls is improved, but the ease of operation deteriorates due to manual handling requirements
Solution Approach 1:
The closed loop structure with elastic tensile member is designed to automatically tighten and engage the pole surface during a fall without requiring manual intervention. The elastic member self-activates by converting its stored potential energy into kinetic energy that pulls the slide members with gaffs against the pole, creating automatic braking action.
3Extent of automation
If elastic tensile member is used to draw cross-strap into engagement, then automatic braking activation is improved, but the device complexity increases due to additional components
Solution Approach 1:
The elastic tensile member serves multiple functions: it provides the driving force for automatic braking activation, maintains tension within the closed loop structure during normal use, and stores potential energy for rapid deployment during falls. This multi-functionality reduces the need for separate components for each function.
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 described pole strap assembly provides enhanced safety by ensuring automatic engagement with the pole during falls, allowing linemen to regain footing securely, with adjustable features for improved usability and durability.
Implementation Method 1
at least one bias member mounted between the slides and the outer strap to urge translation of the slides toward each other along the outer strap
Implementation Method 2
the closed loop formed by the cross strap and the outer strap is tightened onto the pole to ensure that the integral gaffs on the slide members bite the pole and support the lineman
Data Source
AI summary
A pole strap assembly (10) is provided for use in climbing a utility pole (22), and includes an outer strap (12) including opposite end portions (32,34) connected by an intermediate portion (20); and an elongate wear member (30) attached to and extending over at least part of the intermediate portion (20) of the outer strap (12), wherein the wear member (30) does not extend over the end portions (32,34), and the outer strap (12) has a total length LO and the elongate wear member (30) has a length LI, with the length LO being no greater than twice the length LI.