Slider Pull Tab Stability via Shaft and Spring
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Solution Overview
Problem
Conventional sliders for slide fasteners with a stop mechanism are unstable when the pull tab is raised, due to separate parts and attachment methods that lead to wobbling.
Innovation Solution
A slider design featuring a body with a guide post and guide groove, a pull tab with a rotatable base and claw portion, and a coil spring to stabilize the pull tab, including restricting portions to prevent excessive rotation, ensuring the pull tab remains stable when raised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pull tab and locking claw are formed as separate bodies, then the structure is more flexible, but the pull tab becomes unstable and wobbles when raised
Solution Approach 1:
The pull tab and locking claw are merged into a single integrated body, eliminating the separate components that caused instability. This integration ensures that when the pull tab is raised, it remains stable and does not wobble, as the claw portion is fixed relative to the pull tab body.
2Strength
If the pull tab is attached to the body by crimping, then the attachment is secure, but the pull tab rotates while serving as a shaft and becomes unstable when raised
Solution Approach 1:
The rotational function is extracted from the pull tab by introducing a dedicated shaft member. The pull tab is attached to the body via the shaft member, which serves as the rotational shaft, allowing the pull tab to remain stable while still enabling rotation through the shaft member mechanism.
3Stability of the object's composition
If a shaft member is introduced to support the pull tab, then the pull tab stability improves, but the device complexity increases
Solution Approach 1:
The shaft member serves multiple functions: it acts as the rotational shaft for the pull tab, provides structural support to prevent wobbling, and enables the pull tab to be securely attached to the body. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device 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
The design effectively stabilizes the pull tab when raised, preventing wobbling and ensuring smooth operation by utilizing a coil spring to urge the pull tab down and restricting mechanisms to control rotation, enhancing user experience and functionality.
Implementation Method 1
a coil spring attached around the shaft member so as to urge the gripper of the pull tab to be laid down toward the body
Data Source
AI summary
There is provided a slider for a slide fastener. The slider includes a body, a pull tab, a shaft member, and a coil spring. The pull tab has a base portion, a gripper and a claw portion protruding from the base portion. The shaft member is configured to rotatably support the pull tab relative to the body. The coil spring is attached around the shaft member to urge the gripper to be laid down toward the body. A claw guide portion allows a tip end of the claw portion to protrude into the guide groove. A restricting portion of the body restricts rotation of the pull tab when the pull tab is raised by a predetermined angle from the body. A restricted portion of the pull tab comes in contact with the restricting portion when the pull tab is raised by the predetermined angle from the body.