Door Lock Baffle Plate Prevents Unauthorized Turning Force
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door locks with split spindles can be vulnerable to unauthorized opening through abnormal operation, where excessive sideways pressure is applied to the handle, attempting to bypass the latch mechanism and create friction between the driver and follower to pull the bolt inside the lock without authorization.
Innovation Solution
Incorporating unturnable baffle plates with support surfaces fixed against the lock body between the follower and drivers, which prevent the transmission of turning force from the driver to the follower, thereby enhancing security and reducing wear between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch mechanism is used to control force transmission between driver and follower, then authorized operation is enabled, but the door lock remains vulnerable to unauthorized opening through abnormal handle operation
Solution Approach 1:
The patent introduces a baffle plate as an intermediary component between the driver and follower. This baffle plate has a support surface that contacts the lock body, preventing the baffle plate from rotating with the driver. By positioning this intermediary element, the patent blocks the abnormal force transmission path while allowing normal operation through the latch mechanism.
Solution Approach 2:
The patent segments the force transmission path by introducing the baffle plate that divides the direct contact area between driver and follower. The baffle plate creates a distinct separation, allowing normal force transmission through the latch while blocking abnormal direct friction-based transmission. This segmentation isolates the authorized and unauthorized operation paths.
2Duration of action of stationary object
If baffle plates are used between follower and drivers, then wear is reduced, but turning force can still be transmitted through friction during abnormal operation
Solution Approach 1:
The patent applies local quality by designing the baffle plate with a specific support surface configuration that contacts the lock body. This localized structural feature ensures the baffle plate remains stationary while other components rotate. The support surface is positioned and shaped to provide wear protection at the driver-baffle interface while simultaneously preventing rotation that would transmit turning force during abnormal operation.
Data Source
AI summary
The door lock according to the invention comprises a lock body, a bolt, a follower, a driver on both sides of the follower, and a latch solution to connect at least one of the drivers in force transmission connection and out of force transmission connection with the follower. The door lock further comprises a baffle plate between the follower and the driver at least on one side of the follower. The baffle plate comprises at least one support surface, which is set against the lock body or against a part which is connected to the lock body in a fixed manner. The baffle plate can thus not be rotated in relation to the lock body. A baffle plate which cannot be rotated prevents turning force from being transmitted from the driver to the follower.