Bi-directional Clutch Lock with Segmented Pawls
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Solution Overview
Problem
Conventional clutch locks are large, not robust, and lack fine locking increments, with most operating unidirectionally, which is inadequate for applications requiring bi-directional locking and compact designs.
Innovation Solution
A bi-directional clutch lock system comprising a rack and pivotably mounted clutching links and pawls, with a spring-loaded plunger and backlash adjustment, allowing for engagement and restraint of linear or rotary motion in both directions, enabling fine locking increments and high strength within a small space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional clutch locks are used, then locking function is provided, but the device occupies large envelope and is not robust
Solution Approach 1:
The clutch lock mechanism is segmented into multiple independent components including first and second clutching links, first and second pawls, and a rack system. Each component performs a specific function, allowing the overall mechanism to achieve high strength through distributed load paths while maintaining a compact configuration. The segmentation enables the device to be robust without requiring a large envelope.
2Manufacturing precision
If conventional clutch locks are used, then locking function is provided, but fine locking increments are not allowed
Solution Approach 1:
The mechanism incorporates a rack system with teeth that engages with the clutching links, introducing a dimensional element for fine adjustment. The rack can move linearly while the clutching links pivot, creating a two-degree-of-freedom system that enables fine locking increments through the interaction of translational and rotational motions without significantly increasing overall complexity.
3Adaptability or versatility
If conventional clutch locks are used, then single direction locking is achieved, but bi-directional locking capability is lacking
Solution Approach 1:
The mechanism employs asymmetric pawl designs where the first pawl and second pawl have different engagement geometries with the rack teeth. The first pawl is configured to engage teeth in one direction while the second pawl engages teeth in the opposite direction. This asymmetric configuration enables bi-directional locking capability while maintaining relatively simple mechanism architecture through purposeful geometric differentiation rather than duplicating entire subsystems.
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 bi-directional clutch lock system provides robust, compact, and precise locking capabilities in both linear and rotary directions, suitable for applications like aircraft seating, offering fine locking increments and high locking strength.
Implementation Method 1
The moveable housing may comprise a spring loaded plunger. Movement of the spring loaded plunger may cause movement of the moveable housing towards the rack.
Data Source
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AI summary
A bi-directional linear clutch lock (100) is provided that may selectively restrain a rack (102) from translating. Alternatively, a bi-directional rotary clutch lock (500) is provided that may selectively restrain a rotary rack from (502) rotating.