Strike Plate Locking Bolt Latch Guide Design
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Solution Overview
Problem
Existing locking catches for electric door openers and striking plates often result in the latch bolt getting caught in gaps between the pawl and strike plate, leading to insecure door closure and opening due to varying rebate and sealing thicknesses.
Innovation Solution
A ratchet design with a locking shoulder featuring a latch guide web aligned with its front edge, which forms a support for the lock latch, preventing early penetration into gaps and ensuring snag-free interaction, combined with adjustable elongated holes for transverse adjustment of the locking pin to accommodate different dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the locking block is made laterally adjustable to compensate for varying rebate thicknesses and seal thicknesses, then the adaptability to different door configurations is improved, but the risk of the latch engaging in a gap between the locking block and strike plate increases
Solution Approach 1:
The patent introduces a latch guide as an intermediary element between the locking block and the strike plate. This latch guide actively guides the latch during its movement, ensuring it engages properly with the locking block even when the block is laterally adjusted. The latch guide prevents the latch from deviating into gaps, thus maintaining reliable engagement while preserving the lateral adjustability of the locking block.
2Reliability
If a latch guide is added to prevent latch jamming in gaps, then the reliability of latch engagement is improved, but the device complexity increases
Solution Approach 1:
The patent merges the latch guide functionality with the existing locking block structure. The latch guide is integrated into the locking block assembly rather than being a completely separate component, thereby reducing overall device complexity. This integration allows the latch guide to perform its guiding function while maintaining a compact and simplified structural arrangement.
3Adaptability or versatility
If the locking bolt is made adjustable with elongated holes for lateral adjustment, then the adaptability to different door dimensions is improved, but the mechanical stability may be compromised
Solution Approach 1:
The patent employs a dynamic adjustment mechanism where the locking block can be laterally positioned within elongated holes and secured at different positions. This dynamic design allows the locking block to adapt to various door dimensions while maintaining mechanical stability through secure fastening at the selected position. The elongated holes provide adjustment flexibility, and the fastening mechanism ensures stability once adjusted.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
The invention relates to a locking bolt (2) for a strike plate (1), wherein the locking bolt (2) is arranged in a receiving chamber (12) for a latch and comprises a base part (21) screwed into the receiving chamber and a locking shoulder (22) which forms a bearing surface for locking a latch. To prevent the latch from becoming entangled in a gap between the strike plate (1) and the locking shoulder (22), it is proposed that the locking shoulder (22) has a latch guide (3) on its outer surface (22a) which projects from the outer surface of the locking shoulder (22) in a plane parallel to the base part (21).