Side Tarpaulin Tensioner Spring Clip Latching Mechanism
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Solution Overview
Problem
Side curtain tensioners for commercial vehicle bodies face issues with difficult release of snap-in connections and fatigue of spring tongues, leading to a risk of automatic opening.
Innovation Solution
A side curtain tensioner with a spring clip latching element on the clamping bracket that can be latched into a receptacle on the base body, providing a reliable locking mechanism and allowing for easy replacement of worn-out parts, combined with a U-shaped formation and angled detent wing for enhanced prestressing and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring tongues are formed onto the base body to create a snap-in connection for preventing unintentional opening, then protection against automatic opening is improved, but the spring tongues are subject to fatigue and difficult release over time
Solution Approach 1:
The latching mechanism is divided into separate components: the spring clip is detachably connected to the clamping bracket, allowing it to be replaced independently from the base body. This segmentation enables the spring clip to be maintained or replaced without replacing the entire tensioner assembly, thus extending the overall service life while maintaining reliable latching function.
Solution Approach 2:
The spring clip is designed with adjustable prestressing characteristics through its U-shaped formations and bend angles (15°-25°). By optimizing these geometric parameters, the spring clip provides sufficient latching force to prevent automatic opening while reducing stress concentrations that would lead to fatigue failure of the spring tongues.
2Reliability
If a reliable latching connection is ensured using spring clips with U-shaped formations, then protection against automatic opening is improved, but the complexity of the latching mechanism increases
Solution Approach 1:
The spring clip combines multiple functions into a single component: it provides the latching action through its legs engaging with latching receptacles, provides prestressing through its U-shaped formations, and enables easy replacement through its detachable connection to the clamping bracket. This merging reduces the number of separate parts needed while maintaining reliable latching.
Solution Approach 2:
The spring clip design with its outwardly curved crossbar protruding over the clamping bar allows for self-release functionality. When force is applied to the crossbar, the U-shaped formations are prestressed and can be easily disengaged from the latching receptacles, enabling simple manual operation without requiring additional tools or complex release mechanisms.
3Ease of manufacture
If the spring clip is made from spring wire by forming to achieve cost-effective production, then manufacturing cost is reduced, but the precision of the latching geometry may be affected
Solution Approach 1:
The spring clip is designed with specific geometric parameters that accommodate forming processes: the bend angles are specified within ranges (15°-25°) to allow for forming tolerances while maintaining functional performance. The U-shaped formations and leg geometries are optimized to provide sufficient latching force and engagement even with variations introduced by forming processes.
Solution Approach 2:
Different regions of the spring clip are designed with different quality requirements: the latching surfaces and engagement points are precision-formed to ensure proper mating with the latching receptacles, while other regions can tolerate broader tolerances. This localized quality approach ensures reliable latching geometry while maintaining cost-effective production through forming processes.
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 ensures improved protection against automatic opening, simplifies assembly and production, and allows for cost-effective production using spring wire, while maintaining a high level of prestressing and reliability.
Implementation Method 1
the spring clip has a U-shaped formation on its two legs, which can be locked in each case with a snap-in receptacle arranged on the base body. This achieves a prestressing effect in the direction of the locking receptacle.
Data Source
Figure 1a~2b
Figure 2c~3b
Figure 4
AI summary
The invention relates to a side tarpaulin tensioner comprising a base body (1) having two parallel side cheeks (12), a tensioning bracket (2) designed as a single-armed lever which is pivotably mounted about a first pivot axis extending orthogonally to the side cheeks (12) of the base body (1), and a hook part (3) for engaging behind a stationary holding element which serves as an abutment against the tarpaulin to be tensioned and which is pivotably mounted about a second pivot axis extending parallel to the first pivot axis between the side cheeks (12), wherein at least one first locking element is arranged on the tensioning bracket (2) which, in the closed position of the tensioning bracket (2), can be locked with a second locking element arranged on the base body (1), wherein at least one locking element is formed by a spring clip (8) arranged on the tensioning bracket (2).which can be engaged in at least one locking receptacle arranged on the base body (1).