Retractable Bar Push Button Control Mechanism
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Solution Overview
Problem
Conventional retractable tool handles often experience loosening between the inner and outer tubes due to friction interference, leading to positioning inaccuracies, and existing solutions have complex structures that complicate length adjustment.
Innovation Solution
A push button-controlled retractable bar design featuring an inner tube with locating notches, a positioning spring leaf, a control device with a push button and linking mechanism, and an elastic member to accurately engage or disengage positioning protrusions with the notches, allowing for simple and precise length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction interference is used to achieve positioning between inner tube and outer tube, then positioning is achieved, but the tubes easily become loosened and positioning accuracy deteriorates
Solution Approach 1:
A positioning spring leaf is introduced as an intermediary component between the inner tube and outer tube. The spring leaf carries positioning protrusions that engage with locating notches on the inner tube, providing reliable positioning while avoiding direct friction interference between the tubes. This mediator resolves the contradiction by decoupling the positioning function from the friction-based mechanism.
Solution Approach 2:
The positioning function is segmented into discrete engagement points through multiple locating notches on the inner tube and corresponding positioning protrusions on the spring leaf. This segmentation allows for precise positioning at specific intervals while maintaining overall stability, resolving the contradiction between reliable continuous positioning and accurate discrete positioning.
2Ease of operation
If multi-step linking relationship is used among control button, link, control block and positioning post, then positioning control is achieved, but device complexity increases
Solution Approach 1:
Multiple control functions are merged into a single integrated control block that houses both the control button and the linking mechanism. The control block directly connects the button to the positioning spring leaf, eliminating the need for separate links and positioning posts. This merging maintains ease of operation while significantly reducing structural complexity.
Solution Approach 2:
The control block serves multiple functions simultaneously: it houses the control button, provides the linking mechanism for force transmission, and guides the movement of the positioning spring leaf. This multi-functionality reduces the number of separate components needed, resolving the contradiction between operational control and structural simplicity.
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 ensures high positioning accuracy and simplicity by using a push button to control the engagement and disengagement of positioning protrusions with the inner tube notches, facilitating easy length adjustment while maintaining structural integrity.
Implementation Method 1
an elastic member set between the slide seat and the movable member and adapted to push the movable member in a direction toward the positioning spring leaf
Data Source
AI summary
A retractable bar using a positioning spring leaf and a control device to control positioning between an inner tube and an outer tube is disclosed. The control device includes a movable member, a push button, and a linking device connected between the movable member and the push button. When the push button is not pushed by an external force, the positioning spring leaf will be pushed by the movable member to force its positioning protrusions into engagement with locating notches of the inner tube to lock the outer and inner tubes. When the push button is pushed by an external force, the linking device will be forced to move the movable member away from the positioning spring leaf, causing the positioning spring leaf to disengage the positioning protrusions from the locating notches of the inner tube.