Casement Lock Cage Tilting Mechanism for Axial Adjustment

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Solution Overview

Problem

Existing casement locks face issues with unintentional shifting of the closure element along the locking shaft, leading to inadequate door sealing in the closed state due to the design's reliance on nuts for height adjustment and potential unintentional actuation.

Innovation Solution

A casement lock design where the locking element secures the cage against tilting in the locking position and allows tilting in the release position, with axial movement only when tilted, utilizing holding sections with negative profiling to prevent axial displacement, and a pin mechanism to control the locking and release positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a nut is used to adjust the height of the closure element on the locking shaft, then the axial position can be changed, but the closure element can be unintentionally displaced

Engineering Contradiction:

Improveadjustability of closure element heightVSAvoidstability of closure element position

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The locking element is designed to be movable between a locking position (where it prevents tilting and axial movement) and a release position (where it allows tilting and axial adjustment). This dynamic state change enables intentional repositioning while preventing unintentional displacement during normal operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The locking element proactively prevents unwanted axial movement by maintaining the cage in a locked state against the profiling of the locking shaft. The design anticipates potential unintentional displacement and counteracts it through the constant engagement of the locking element in its locked position.

Inventive Principle:

Principle #9Preliminary anti-action

2Ease of operation

If the locking element allows the cage to be tilted relative to the locking shaft, then axial movement can occur, but unintentional rotation may occur when the locking element gets into the release position

Engineering Contradiction:

Improveease of axial adjustmentVSAvoidsecure fixation of closure element

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The locking element transitions between two distinct states: locked (preventing tilting and rotation) and released (allowing controlled tilting for axial adjustment). This dynamic design enables intentional repositioning while preventing unintentional displacement during normal operation.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the cage is fixed securely to the locking shaft, then axial displacement is prevented, but intentional repositioning becomes difficult

Engineering Contradiction:

Improvesecure fixation of cageVSAvoidease of height adjustment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10604966B2Cam lock with a closure element which can be fixed to a locking shaft at different heights

Publication Date: 2020.03.31 EMKA BESCHLAGTAILE GMBH & CO KG

AI summary

A casement lock (1) includes an actuation lug (2); a locking shaft (3) coupled to the actuation lug (2) and having two opposite flattened axial regions (5) at a free end (4) of the locking shaft and a circumferential profiling (6) between the flattened axial regions (5); and a cage (8) supporting a closure element (7) configured to be placed with an opening (9) on the free end (4) of the locking shaft (3) and fixed to the locking shaft (3). A locking element (14) is provided on the cage (8), which, in a locking position, secures the cage (8) on the locking shaft (3) against tilting. In a release position of the locking element (14), the cage (8) can be tilted relative to the locking shaft (3) and is moveable in an axial direction along the locking shaft (3) only in a state when tilted relative to the locking shaft (3).