Articulated Locking Members for Screwdriver Direction Switching
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Solution Overview
Problem
Existing screwing tools with direction-switchable freewheel locks lack efficient mechanisms for independent movement of locking members, leading to suboptimal engagement and disengagement of locking teeth, affecting rotational direction control.
Innovation Solution
The locking members are designed to move articulately relative to each other, with hook projections and L-shaped switching extensions, allowing for independent engagement with the peripheral toothing in different switching positions, and a spring-loaded mechanism for tensioning the switching elements, enabling seamless direction switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If locking members are connected using the same material as a single piece, then manufacturing is simplified, but the ability to independently engage and disengage locking teeth is reduced
Solution Approach 1:
The locking mechanism is divided into separate locking members (first locking member and second locking member) that can move independently relative to each other. Each locking member has its own locking teeth that can independently engage with the circumferential toothing, allowing for more efficient engagement and disengagement operations while maintaining manufacturing feasibility through modular construction
2Device complexity
If locking members move rigidly together, then structural simplicity is maintained, but precise control over rotational direction is compromised
Solution Approach 1:
The locking members are designed with relative movement capability through hinge connections and switching extensions. This dynamic configuration allows the locking members to independently position themselves for precise engagement with the circumferential toothing in different switching positions, enabling accurate control over the rotational direction of the output member while maintaining reasonable structural complexity
3Device complexity
If switching mechanism lacks spring-loaded tensioning, then device complexity is reduced, but seamless direction switching is compromised
Solution Approach 1:
A switching spring is pre-loaded to automatically tension the switching extensions when the switching element rotates. This preliminary action ensures that the locking members are properly positioned and engaged before the switching operation is complete, enabling seamless direction switching without requiring complex external actuation mechanisms
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
This design ensures precise control over rotational direction, allowing the output member to be freely rotatable in one direction while locked in the other, with enhanced engagement and disengagement of locking teeth, improving the tool's operational efficiency.
Implementation Method 1
A spring-loaded control flank can be arranged within the switching element. The switching spring can in turn be supported on a locking plunger
Implementation Method 2
The locking members can preferably move relative to one another in a hinge-like manner. For this purpose, hook projections which engage with one another are provided
Implementation Method 3
locking members located in a pocket of the drive member, each having a locking toothing for rotationally locking engagement in the circumferential toothing
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a screwdriver having a changeable direction freewheel lock, having a drive output member (2) that is mounted so as to be rotatable about an axis (a) in a bearing eye (6) of a drive input member (1) and has a circumferential toothing (5) and a drive-output profile portion (4), and locking members (10, 20) that are inserted in a pocket (17, 27) of the drive input member (1) and each have a locking toothing (11, 21) for engaging with the circumferential toothing (5) in a manner preventing rotation. What is essential is that the locking members (10, 20) are two bodies that are movable relative to one another, can be displaced in an articulated manner with respect to one another and each have a switching extension (13, 23) which project into the same switching recess (30) of a switching member (3).