Wristwatch Strap Attaching Member with Rotating Elastic Shafts
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Solution Overview
Problem
Existing wristwatch strap attachment systems require significant time and labor for attachment and detachment, and pose challenges during storage due to protruding spring bar ends that can get caught by other objects.
Innovation Solution
A wristwatch strap system featuring an end-piece with a recessed area and an attaching member with fold-back portions that can be rotated to project or retract attaching shafts, allowing for easy attachment and detachment without tools and minimizing storage interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spring bar end portions are always projected from the end-piece, then the strap can be easily attached to the case body, but the strap may be caught by other members during storage and handling
Solution Approach 1:
The attaching member is designed to rotate between a first position (where shaft portions are projected) and a second position (where shaft portions are retracted). This dynamic positioning allows the system to adapt between attachment mode and storage mode, eliminating the harmful effect of protruding ends during storage while maintaining ease of operation during attachment.
2Reliability
If the handle is rotated to erect position to contract the spring bar, then the end portion can be immersed into the curl portion, but significant time and labor are required for attachment and detachment operations
Solution Approach 1:
The attaching member is pre-loaded with elastic force in the fold back portion. When the attaching member is rotated to the first position, the elastic force automatically projects the shaft portions outward, eliminating the need for manual insertion operations and significantly reducing the time and labor required for attachment.
Solution Approach 2:
The elastic fold back portion automatically projects the shaft portions when the attaching member is rotated to the first position, and automatically retracts them when rotated to the second position. This self-service mechanism eliminates the need for manual manipulation of the spring bar ends, reducing operational time and labor.
3Ease of operation
If the attaching shaft portions are always projected from the end-piece, then attachment to rod legs is facilitated, but the protruding portions create storage and handling problems
Solution Approach 1:
The attaching member rotates between two positions: first position where shaft portions are projected for attachment, and second position where shaft portions are retracted for storage. This dynamic transformation allows the system to exhibit different functional states, facilitating attachment operations while eliminating storage interference.
4Adaptability or versatility
If a traditional spring bar mechanism is used with inclined faces and taper faces, then the strap can be attached without special tools, but the mechanism is complex and requires multiple operational steps
Solution Approach 1:
The attaching member is segmented into distinct functional portions: the fold back portion providing elastic force, the attaching shaft portions for engagement, and the rotating connection to the end-piece. This segmentation allows each portion to perform its specific function independently, simplifying the overall mechanism while maintaining tool-free attachment capability.
Solution Approach 2:
The attaching member serves multiple functions: it provides elastic force through the fold back portion, projects shaft portions for attachment, secures the strap in the attached state, and retracts shaft portions for storage. This multi-functionality eliminates the need for separate components and operational steps, reducing mechanism complexity.
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 operational efficiency in attaching and detaching the strap and improves handling during storage by preventing the strap from being caught by other objects, ensuring a smooth and hassle-free user experience.
Implementation Method 1
capable of being deformed elastically in a direction of widening and a direction of narrowing an interval between the pinching portions
Implementation Method 2
movably between a first position and a second position by rotating the attaching member
Data Source
AI summary
To provide a wristwatch capable of promoting operability of attaching and detaching an end-piece to and from a rod leg and capable of promoting handling performance in being brought to and from a storing place. A recess portion is formed at a back face of an end-piece of a strap. Through holes opposed to attaching holes of rod legs are respectively provided at side walls of the piece in a state of receiving the piece at a rod crotch between the rod leg of a case body continuous to each other. An attaching member including a fold back portion having pinching portions and capable of being elastically deformed in directions of increasing and reducing an interval therebetween and attaching shaft portions folded to bend from the two portions to be rotatably inserted into the holes is contained in a recess portion movably between a first position and a second position. A fixed shaft pinched by the portion when the member is arranged at the first position is provided at the recess portion to be shifted from a linear line connecting the through holes. The shaft portions are projected to outside of the piece by widening an interval between the portions by the shaft at the first position, and the shaft portions are immersed into the piece when the member is arranged at the second position by detaching the fold back portion from the shaft.