Telescopic Handle Traction Cable Mechanism for Cleaning Equipment
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Solution Overview
Problem
Telescopically extendable handles for cleaning devices face a short service life due to the risk of damage and tearing of steel strips when absorbing both tensile and compressive loads, especially with frequent length adjustments.
Innovation Solution
A three-part telescopic handle design using traction cables and deflection rollers to manage movement between the outer, middle, and inner tubes, ensuring that only tensile stress is applied, thereby reducing material strain and increasing the mechanism's longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If steel strips are used to transmit both tensile and compressive forces in the telescopic handle, then the handle can be extended and retracted, but the steel strip is at risk of damage and tearing, shortening the service life
Solution Approach 1:
The patent changes the force transmission parameter from bidirectional (tensile and compressive) to unidirectional (tensile only) by replacing steel strips with traction cables. This parameter change eliminates the risk of material damage associated with compressive loading while preserving the telescopic extension capability.
Solution Approach 2:
The patent substitutes the mechanical steel strip system with a cable-based traction system. This replacement eliminates the structural limitations of steel strips under compressive load while maintaining the required mechanical functionality of the telescopic handle.
2Adaptability or versatility
If frequent length adjustments are made to the telescopic handle, then the handle becomes more adaptable to different cleaning tasks, but the steel strip mechanism experiences increased wear and potential failure
Solution Approach 1:
The patent changes the force transmission mode from bidirectional steel strip loading to unidirectional cable tension, which dramatically improves durability under frequent adjustment conditions. Cables are inherently more resistant to fatigue from repeated loading cycles compared to steel strips subjected to alternating tensile and compressive forces.
3Ease of operation
If deflection rollers are built-in to the steel strip mechanism, then the handle can change direction during extension, but the steel strip is at risk of tearing at the edge, reducing service life
Solution Approach 1:
The patent replaces the steel strip with traction cables that are guided over deflection rollers. This substitution eliminates the edge tearing problem inherent in steel strip mechanisms while preserving the necessary deflection capability for handle operation.
Solution Approach 2:
The patent changes the force transmission medium from steel strip to cable, which fundamentally alters the stress distribution characteristics. Cables distributed stress more evenly when changing direction over rollers, eliminating the concentration of stress at edges that causes tearing in steel strip systems.
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 solution extends the service life of the telescopic handle by using traction cables that are more suitable to tensile stress, ensuring the mechanism can be pulled out and pushed together efficiently without risking material damage, leading to a longer-lasting mechanism.
Implementation Method 1
a first traction cable which is routed over the first deflection roller in such a way that it changes direction by approximately 180° and whose first traction cable end is attached to the inner tube and whose second traction cable end is attached to the outer tube
Implementation Method 2
a first deflection roller and an elongate fastening element are fastened to the first pipe end... a first traction cable which is routed over the first deflection roller in such a way that it changes direction by approximately 180°
Data Source
Figure 1~3
AI summary
A telescopic handle for cleaning equipment comprises an outer tube (13), a middle tube (14), and an inner tube (15), wherein the outer tube (13) is slidably guided around the middle tube (14), and the inner tube (15) is slidably guided in the middle tube (14); wherein the middle tube (14) has a first tube end in the outer tube (13) and a second tube end around the inner tube (15); a first deflection pulley (22) and an elongated fastening element (24) are attached to the first tube end, wherein the elongated fastening element (24) extends towards the second tube end and a second deflection pulley (28) is attached to the side of the elongated fastening element (24) facing away from the first tube end;a first pull rope (30) which is guided over the first deflection pulley (22) in such a way that it changes direction by approximately 180° and whose first pull rope end (32) is attached to the inner tube (15) and whose second pull rope end (34) is attached to the outer tube (13); and a second pull rope (36) which is guided over the second deflection pulley (28) in such a way that it changes direction by approximately 180° and whose first rope end (38) is attached to the inner tube (15) and whose second rope end (40) is attached to the outer tube (13), wherein the first pull rope (30) and the second pull rope (36) are arranged such that a manual displacement movement between the outer tube (13) and the middle tube (14) causes a corresponding, automatic displacement movement between the middle tube (14) and the inner tube (15).