Casement Lock Axial Securing Hygiene Design
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Solution Overview
Problem
Casement locks with axial movement of the actuating element relative to the housing are problematic in applications requiring hygiene, as they can introduce impurities and dust, especially in sectors like medical and food industries.
Innovation Solution
A casement lock design where the actuating element is axially secured in the first angular range and released in the second, using a coupling shaft and mechanism to transmit movements without axial movement, ensuring the actuating element does not move relative to the housing in the first range, and indirect axial securing in the second range for simplified construction and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuating element is allowed to move axially with respect to the casement lock housing during actuation, then the user receives good feedback about the closing state of the casement lock, but impurities, dust, or dirt can be introduced into the casement lock housing from the outside
Solution Approach 1:
The actuation process is divided into two distinct angular ranges: the first angular range (90°) where the actuating element moves axially to provide user feedback, and the second angular range (90°) where the actuating element is axially secured to prevent contamination. This segmentation allows the system to achieve both good user feedback and protection against contamination at different stages of operation.
Solution Approach 2:
The securing means is designed to be dynamically engageable and disengageable based on the angular position of the actuating element. The securing contour on the actuating element interacts with the securing contour on the casement lock housing to provide axial securing only when needed (in the second angular range), while allowing axial movement in the first angular range for user feedback.
2Reliability
If multiple threads are used to connect the actuating element, casement lock housing and locking element, then the desired turn-and-brace functionality is achieved, but the construction becomes complex
Solution Approach 1:
The patent combines the functions of multiple threaded connections into a single, integrated securing means with securing contours. Instead of using separate threads to achieve axial securing, rotational coupling, and opening indication, the invention uses one securing means that performs all these functions simultaneously, significantly simplifying the construction while maintaining the turn-and-brace functionality.
Solution Approach 2:
The securing means is designed as a multi-functional component that simultaneously provides: (1) axial securing of the actuating element in the second angular range, (2) coupling between the actuating element and locking element, and (3) opening indication through axial movement in the first angular range. This multi-functionality eliminates the need for multiple separate components.
3Device complexity
If the actuating element is axially secured via a securing means in the second angular range, then construction is simplified and assembly is easier, but the actuating element cannot provide axial movement feedback to the user
Solution Approach 1:
The actuation angle is segmented into two distinct ranges with different securing states. In the first angular range (90°), the actuating element is axially released to provide movement feedback to the user. In the second angular range (90°), the actuating element is axially secured to simplify construction and prevent contamination. This temporal segmentation resolves the contradiction between simplicity and usability.
Solution Approach 2:
The securing means periodically engages and disengages during the actuation cycle, creating a rhythmic pattern of axial freedom and axial constraint. This periodic action allows the system to alternatingly provide user feedback and maintain construction simplicity/contamination prevention at different phases of operation.
Data Source
AI summary
A casement lock for locking a door, the casement lock having a casement lock housing, an actuation element rotatably mounted on the casement lock housing, and a locking element which is coupled with the actuation element and can be translationally moved in a first angular range of the actuation element and rotationally moved in a second angular range of the actuation element, the actuation element being axially secured by securing means in the first angular range and being axially released by the securing means in the second angular range.