Compact Reel Tightening Device With Spring-Loaded Release Lock
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Solution Overview
Problem
Existing reel-based tightening devices require continuous user activation for quick release of the traction cable, which can be uncomfortable and inconvenient, especially during sports activities, and are prone to inadvertent release due to impacts.
Innovation Solution
A reel-based tightening device with selective release means that can be actuated by the user to enable quick release of the cable, featuring retaining means to maintain the release position even when the user stops acting on it, and optional safety means to prevent inadvertent release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If continuous user activation is required for quick release, then the release function can be controlled, but the device becomes uncomfortable and inconvenient to use
Solution Approach 1:
The device uses a spring-loaded plunger that automatically engages with a cam surface on the spool to maintain cable tension. The system serves itself by using the cable tension to compress the spring, which then provides the locking force through the plunger-cam interaction, eliminating the need for continuous user activation while preventing inadvertent release.
Solution Approach 2:
The locking mechanism is designed to preemptively counteract inadvertent release by using a spring-loaded plunger that continuously exerts locking force. The cam surface geometry ensures that any accidental movement or impact must overcome the pre-loaded spring force, providing preliminary protection against unintended cable release.
2Ease of operation
If a simple release mechanism is used, then the device is easier to operate, but it becomes prone to inadvertent release due to impacts
Solution Approach 1:
The locking mechanism is designed to preemptively counteract inadvertent release by using a spring-loaded plunger that continuously exerts locking force. The cam surface geometry ensures that any accidental movement or impact must overcome the pre-loaded spring force, providing preliminary protection against unintended cable release.
Solution Approach 2:
The cam surface is designed with a curved geometry that provides mechanical advantage. The curved cam surface converts the radial spring force into an axial locking force on the spool, creating a mechanically advantageous locking action that is both simple to operate and resistant to inadvertent release from impacts.
3Ease of operation
If the device structure is extended to accommodate release mechanisms, then the release function is improved, but the device profile becomes less compact
Solution Approach 1:
The plunger is received within a recess in the housing, and the spring is contained within the housing volume. The cam surface is integrated onto the spool itself rather than being a separate component. This nesting arrangement accommodates the quick release mechanism within the existing device footprint without extending the overall profile.
Solution Approach 2:
The spool serves multiple functions: it winds the cable, provides the cam surface for locking, and acts as the rotating element that releases the cable when the plunger is actuated. By making the spool multi-functional, the design eliminates the need for separate dedicated release mechanism components, maintaining a compact profile.
Data Source
AI summary
A reel-based tightening device includes a housing case defining a housing seat, a spool housed rotatable around a first rotation axis in said housing seat and provided with annular groove to allow the winding of a traction cable, a knob assembly rotatably mounted on said housing case around a second rotation axis parallel to said first rotation axis and operatively connected to said spool through drive means, locking means configured to lock the rotary position progressively achieved by the spool by rotating the knob assembly so as to obtain the gradual winding and unwinding of the cable around said spool, and selective release means which can be actuated by a user so as to free the rotation of said spool and allow the quick release of the cable.