Pivoting Strap Buckle for Adjustable Reversible Bag Straps
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Solution Overview
Problem
Conventional bag straps, particularly reversible ones, lack adjustability in length and cannot display different looks on both sides simultaneously.
Innovation Solution
A strap buckle with a pivotable bar and locking mechanism allows for adjustable length and reversible display of different faces on a bag strap, featuring a planar frame with slots and a bar that can rotate around a pivot axis, along with a pin and housing for locking, made of materials like brass, steel, or silver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional strap buckle design is used, then the structure is simple, but the strap cannot be adjusted in length and cannot display different looks on both sides
Solution Approach 1:
The bar is made pivotable around a rotation axis perpendicular to the frame plane, allowing it to rotate between locked and unlocked positions. This dynamic element enables the strap to be adjustable in length and reversible in appearance, transforming a static buckle into a multi-functional device without requiring multiple separate components
Solution Approach 2:
The single buckle structure performs multiple functions: it secures the strap (locking function), allows length adjustment (pivotable bar), and enables reversible display (full turn rotation). The pin and housing mechanism provides both locking and unlocking capabilities, making one component serve several purposes that would traditionally require separate mechanisms
2Ease of operation
If the bar is made pivotable for adjustability, then length adjustment and reversible display are enabled, but the locking mechanism must be more complex
Solution Approach 1:
The pin is elastically constrained to automatically engage with the housing when the bar is in the extended position, providing self-locking functionality. The elastic constraint ensures the pin remains in the received position without requiring additional locking actions, allowing the strap to maintain its adjusted state automatically
Solution Approach 2:
The pin acts as an intermediary element between the bar and frame, transferring the locking function. When the bar is extended, the pin engages with the housing to lock the position; when retracted, it releases the lock. This intermediary mechanism simplifies the overall system by using a single movable component to control the locking state
Data Source
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AI summary
A strap buckle (26) for bag strap (14), in particular for a shoulder strap, comprises: - a substantially planar frame (32), surrounding an opening (34), the frame (32) having two opposite slots (421, 422); - a bar (44), extending through the opening (34) along a main direction of extension (A1), the main direction of extension (A1) being parallel to the two opposite slots (421, 422), the bar (44) being mounted on the frame (32), so as to be pivotable around a rotation axis (A2), out of the plane of the frame (32); - means (50, 52) for selectively locking the bar (44) in the position where it extends through the opening (34).