Concrete Vibrator Backpack Hose Guide for Load Transfer
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Solution Overview
Problem
Hand-held concrete vibrators are heavy, causing user discomfort and health issues, and their protective hoses can damage compacted concrete, requiring rectification work.
Innovation Solution
A backpack device with a hose guide that transfers the vertical load of the concrete vibrator to the user's shoulder, allowing the hose to be movable and reducing contact damage, featuring a housing with a convex surface and an extension rail for secure guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the protective hose is guided rigidly over the shoulder, then load transfer to the user is improved, but the hose cannot move along its longitudinal direction causing operational restrictions
Solution Approach 1:
The hose guide is designed with a movable contact point that can shift along the hose's longitudinal direction. This dynamic element allows the hose to move freely while maintaining load transfer capability, as the contact point adapts its position based on hose movement rather than restricting it.
Solution Approach 2:
The hose guide acts as an intermediary element between the hose and the user's shoulder. It features a contact point that can move along the hose, serving as a flexible mediator that transfers load while accommodating hose movement, thus resolving the contradiction between rigid load transfer and flexible hose movement.
2Stability of the object's composition
If the hose guide provides strong friction to prevent lateral slipping, then stability is improved, but the hose cannot be movable in horizontal direction
Solution Approach 1:
The hose guide features a sliding surface with specific friction characteristics localized at the contact point. This sliding surface provides sufficient friction to prevent unwanted lateral slipping while allowing controlled horizontal movement. The local quality of the sliding surface creates different friction zones that simultaneously provide stability and movability.
3Strength
If the housing is made rigid to provide structural support, then load bearing capacity is improved, but the hose guide cannot accommodate hose movement
Solution Approach 1:
The housing is segmented into a rigid outer structure and a movable internal contact point. The rigid housing provides structural support and load bearing capacity, while the movable contact point inside the housing accommodates hose movement. This segmentation allows the system to simultaneously achieve structural strength and guidance flexibility.
4Ease of operation
If the base plate is positioned centrally to distribute load evenly, then user comfort is improved, but the hose guide cannot be positioned optimally for load transfer
Solution Approach 1:
The hose guide is positioned in a different spatial dimension relative to the base plate. While the base plate remains centrally positioned for load distribution and user comfort, the hose guide is arranged at a distance from the shoulder straps in a vertical direction, creating an optimized load transfer path. This dimensional separation allows both central load distribution and optimal hose guide positioning.
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
Enhances user safety by distributing the weight of the concrete vibrator, reducing long-term health risks and minimizing damage to compacted concrete through effective load transfer and hose guidance.
Implementation Method 1
the sliding surface has a coefficient of sliding friction of rubber (protective hose) on plastic (hose guide) in a dry state of between 0.2 and 0.4 according to DIN EN ISO 8295
Data Source
AI summary
A backpack device having a harness unit and a battery pack receptacle for receiving a battery pack for supplying a hand-held concrete vibrator with energy, wherein the concrete vibrator has an elastically deformable protective hose, and wherein the backpack device has a hose guide via which the protective hose can be guided with a load-transferring effect over a shoulder of a user of the backpack device.