Adjustable Slide Knob Safety Lock Against Backing Off
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Solution Overview
Problem
Conventional adjustable slide knobs with partially threaded nuts are prone to misalignment, self-disassembly, and 'backing off' due to lack of internal security mechanisms, leading to instability and potential disengagement under vibrations or cyclic loads, necessitating external methods for reassembly and safety.
Innovation Solution
An adjustable slide knob with a locking tab, locking tab spring, primary spring, and retention pin, which includes a key-way on the threaded rod and a shelf on the nut for secure engagement, preventing complete disengagement by actively locking the nut onto the rod, ensuring alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional partially threaded nut is used in an adjustable slide knob, then the device allows quick adjustment and easy operation, but the nut can rotate out of alignment with the insertion point and the assembly can fall apart when the device is prone
Solution Approach 1:
The insertion point is pre-configured with alignment features (ridges or guide surfaces) that automatically align the partially threaded nut with the insertion point as the nut is depressed, eliminating the need for manual realignment and ensuring proper orientation before the threaded rod is inserted
Solution Approach 2:
The partially threaded nut is nested within the housing in a recess that provides geometric constraints, preventing the nut from rotating out of alignment and securing it in the correct position relative to the insertion point when the device is in its prone state
2Ease of manufacture
If the partially threaded nut and spring are free-floating in the housing, then the device allows easy assembly and disassembly, but the assembly can fall apart with the spring launching the nut and itself out of the housing when not in use
Solution Approach 1:
The device incorporates self-retaining features where the housing structure itself provides geometric constraints and retention mechanisms for the nut and spring, eliminating the need for external fasteners or complex assembly procedures while preventing accidental disassembly
Solution Approach 2:
The housing design incorporates asymmetric retention features such as one-way clips, directional springs, or asymmetric recesses that allow easy assembly in one direction but prevent disassembly in the opposite direction, securing the nut and spring when the device is prone
3Ease of operation
If a conventional nut without full 360° thread coverage is used, then the device allows quick adjustment and easy operation, but the nut can experience excessive translation and backing off under vibrations or cyclic loads
Solution Approach 1:
A safety lock mechanism is pre-positioned within the housing that automatically engages with a corresponding feature on the partially threaded nut when the device is assembled, providing preliminary prevention against backing off before any vibration or cyclic load is applied
Solution Approach 2:
The safety lock mechanism applies a preliminary counteracting force or mechanical constraint that opposes the direction of potential backing off, preventing the nut from translating excessively under vibrations or cyclic loads while maintaining the quick adjustment capability
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 solution provides a secure, self-contained adjustable slide knob that maintains alignment and prevents 'backing off' through the active safety lock mechanism, ensuring reliable operation and stability against vibrations, and reduces surface damage with a low-friction ring.
Implementation Method 1
a locking tab spring positioned to apply a load to the locking tab
Implementation Method 2
a primary spring positioned to apply a radial load to an engaged threaded rod
Implementation Method 3
The partially threaded nut rests on a compression spring that applies force between the internal 'floor' of the housing and the 'bottom' of the nut
Data Source
AI summary
The presently disclosed adjustable slide knob addresses the ‘Backing-Off’ problem present with various conventional nuts. The adjustable slide knobs can be quickly positioned along a threaded rod by applying pressure to an exposed surface of a partially threaded nut. When the knob is placed against a work surface and the user releases pressure from the partially threaded nut, the thread pattern on the partially threaded nut meshes with the matching thread pattern on the threaded rod. The device can then be twisted, which will translate the device along the threaded rod, to apply a larger load to the work surface. The threaded rod may include one or more key-ways shaped to allow a locking tab housed within the knob to stop the device from freely disengaging the threaded rod to protect a user from potential injury caused by the fastener unexpectedly backing off and disengaging.