Chuck Ratchet Locking Sleeve to Prevent Jaw Loosening
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Solution Overview
Problem
Existing chucks with ratchet mechanisms fail to reliably lock jaws in place during rotation in both directions, leading to potential loosening issues.
Innovation Solution
A chuck with a ratchet mechanism featuring a toothed ring, pivotally mounted pawl, and elastic element, operated by a control sleeve with a cantilevered distal portion and annular protrusion/recess, allowing for secure locking and releasing positions to prevent jaw loosening in either rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a control sleeve is added to operate the ratchet mechanism, then locking and releasing functions are achieved, but the device complexity increases
Solution Approach 1:
The control sleeve performs multiple functions: it engages with the pawl to release the ratchet lock, it guides the axial movement of the pawl, and it provides a user interface for operation. By combining these functions in a single component, the design avoids adding excessive complexity while achieving reliable locking and releasing control
Solution Approach 2:
The control sleeve merges the release mechanism and the axial guidance function into a single integrated component. This consolidation reduces the total number of parts compared to having separate release levers and guidance structures, thereby reducing device complexity while maintaining ease of operation
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 more reliable locking mechanism that uses fewer components and effectively blocks loosening rotation while allowing tightening rotation, ensuring the jaws remain securely gripped regardless of the chuck's rotation direction.
Implementation Method 1
an elastic element urging the pawl to engage the toothed ring
Data Source
AI summary
The chuck comprises a base body (1) having a central axis (12), an outer casing (2) axially fixed but rotatable about the central axis (12) outside the base body (1), the outer casing (2) having inner guides (15) and a plurality of jaws (3) movable along the inner guides (15), a fitting mechanism linking rotations of the outer casing (2) to movements of the jaws (3), and a locking device comprising a ratchet mechanism operated by an outer control sleeve (14). The ratchet mechanism comprises a toothed ring (5) fixed to the base body (1), a pawl fixed to a lever (10) pivotally mounted to the outer casing (2) about a pivot pin (9) parallel to the central axis (12), and an elastic element (28) urging the pawl (6) to engage 10 the toothed ring (5). The control sleeve (14) is rotatable and axially movable in cooperation with a cam (8).