Separable Slide Fastener Box Pin Protrusion Guide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional separable bottom end stops for slide fasteners face difficulties in smooth insertion and fitting of the insert pin due to collisions with the diamond of the reverse opening slider, leading to incomplete accommodation of the box pin and a compromised appearance.
Innovation Solution
A separable bottom end stop design featuring a box pin with a protrusion and side faces that guide the insert pin securely, avoiding diamond collisions, and incorporating projecting portions to prevent the reverse opening slider from dropping, along with a dented portion for smooth insertion and automatic locking mechanisms for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the insert pin is inserted with the upward opening slider kept in contact with the reverse opening slider, then the insert pin collides with the diamond of the reverse opening slider, but smooth insertion is achieved
Solution Approach 1:
The patent extracts the harmful collision between the insert pin and the diamond by providing a protrusion on the box pin that guides the insert pin to approach the diamond from the side rather than from the front. This extracts the harmful direct collision and replaces it with a guided lateral approach, eliminating the collision while maintaining smooth insertion.
Solution Approach 2:
The protrusion on the box pin acts as an intermediary element between the insert pin and the diamond. It mediates the interaction by guiding the insert pin's approach path, preventing direct contact between the insert pin and the diamond, while still enabling the insert pin to engage properly with the slider mechanism.
2Reliability
If the projecting portion is provided on the rear face at the corner of the front end of the box pin, then the reverse opening slider is prevented from escaping, but the box pin cannot be completely accommodated in the slider body
Solution Approach 1:
The patent applies asymmetry by providing projecting portions on both the front and rear faces of the box pin at different positions. The front projecting portion prevents the slider from escaping forward while the rear projecting portion prevents backward escape. This asymmetric arrangement on opposite faces allows complete accommodation in the slider body while maintaining security in both directions.
Solution Approach 2:
The patent moves the projecting portions from a single location to multiple locations on different faces of the box pin. By distributing the projecting portions across front and rear faces, the solution transitions from a single-point constraint to a multi-dimensional constraint system, enabling complete accommodation while preventing escape in multiple directions.
3Ease of operation
If the protrusion is positioned to guide the insert pin, then insertion is facilitated, but the protrusion may collide with the diamond
Solution Approach 1:
The patent applies local quality by designing the protrusion with specific geometric characteristics - the apex angle is set between 60-120 degrees, and the height is specifically controlled. This localized geometric optimization ensures the protrusion can guide the insert pin effectively while its specific dimensions prevent it from colliding with the diamond during the insertion process.
Data Source
AI summary
A slide fastener, wherein in the fastener chain openable and closable from both ends thereof, a box pin and the insert pin, which can join with or separate from each other, are provided at least on an end of the fastener chain; and a protrusion facing the insert pin and projecting from an opposing face is provided at a front end of the box pin; the protrusion has slopes inclined in a direction of approaching the insert pin on upper and lower sides of the protrusion; and the lower side of the protrusion makes contact with a diamond of the reverse opening slider, while the upper side of the protrusion can guide the insert pin smoothly when the pin is inserted.