Rotating Locking Ring for Tool-Free Screwdriver Reaction Arm
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Solution Overview
Problem
Existing screwdrivers require complex work steps to attach or remove reaction arms, as the previously known locking rings necessitate tool-assisted fastening or removal, complicating the handling of reaction force transmission elements.
Innovation Solution
A locking ring system comprising a retaining ring and a locking ring, arranged coaxially with the locking ring being rotatable relative to the retaining ring, which can be easily pushed onto a housing section and rotated into a locking position to secure the reaction force transmission element without tools, utilizing a groove and locking sections for axial stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional retaining ring with circumferential groove is used to secure the reaction arm, then the reaction arm can be secured to the housing, but the attachment and removal process requires tool-assisted complex work steps
Solution Approach 1:
The locking ring is designed to be rotatable relative to the retaining ring, transforming a static connection into a dynamic one. The locking ring can rotate between a basic position (for easy attachment/detachment) and a locking position (for secure fixation), allowing the user to switch between ease of operation and securing reliability as needed
Solution Approach 2:
The fastening system is divided into two independent functional components: a retaining ring that provides the basic securing function and a locking ring that provides the locking function. This segmentation allows each component to be optimized independently and simplifies the attachment process as the locking ring can be independently rotated into position
2Ease of operation
If a locking mechanism with multiple components is introduced to simplify handling, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The locking ring and retaining ring are designed to be coaxially arranged and can be attached together as a unit. The locking ring integrates multiple functions: it provides the locking surface, engages with the groove, and maintains coaxial alignment. This merging reduces the number of separate components needed and simplifies the overall assembly process despite the added locking functionality
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A retaining ring (10) for securing a reaction force transmission element to a housing (102) of a screwdriving device (100), wherein the screwdriving device (100) has an axially extending housing section (108) with a housing profile to which the reaction force transmission element can be positively attached, and wherein the housing section (108) has an at least partially circumferential groove (112), with a retaining ring (12) and with a locking ring (14), wherein the retaining ring (12) has a retaining ring hole (12a) with an inner profile adapted to the housing profile of the housing section (108), wherein the locking ring (14) has a locking ring hole (14a) with an inner profile adapted to the housing profile of the housing section (108) and a thickness adapted to the groove (112), wherein the retaining ring (12) and the locking ring (14) are arranged coaxially to each other and are held axially to each other.wherein in a basic position the retaining ring hole (12a) and the locking ring hole (14a) at least partially overlap, wherein the locking ring (14) is rotatably arranged about a central axis (M) common with the retaining ring (12) relative to the retaining ring (12) and, in the state arranged on the housing section (108), the locking ring (14) is rotatable from the basic position relative to the retaining ring (12) into a locking position in which the locking ring (14) engages in the groove (112) at least with a locking section.