Lock Swing Bolt Housing Edge Anti-Pushback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lock designs with pivot bolts face issues with bearing play and wear, leading to incomplete pivoting and reduced security against push-back attacks.
Innovation Solution
A housing edge is integrated perpendicular to the faceplate, projecting into the lock's interior in the locking position, which collides with the swivel bolt's body edge when pushed back, preventing further pivoting and enhancing security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting rod engages behind the bolt to prevent pivoting back, then security against push-back attacks is improved, but the bolt cannot pivot completely due to bearing play and wear
Solution Approach 1:
The solution segments the anti-push-back mechanism into two independent parts: the hook-shaped bolt that provides security, and the L-shaped control cam that prevents pivoting back. This segmentation allows the bolt to pivot freely without being constrained by the anti-push-back mechanism, resolving the contradiction between complete pivoting capability and push-back protection.
Solution Approach 2:
The L-shaped control cam acts as an intermediary element between the connecting rod and the bolt. Instead of the connecting rod directly engaging behind the bolt, the control cam mediates this interaction. The control pin engages the control cam, which then controls the bolt's movement, allowing the bolt to pivot completely while still preventing push-back attacks.
2Reliability
If the control pin engages both in the slotted guide and in the driving recess, then the swivel bolt is secured against pushing back, but precise coordination of multiple components is required
Solution Approach 1:
The solution extracts the anti-push-back function from the complex coordinated system of slotted guides and drive rods. By using the L-shaped control cam with its control pin, the anti-push-back mechanism is simplified to a single component that does not require precise coordination with other moving parts, reducing device complexity while maintaining security.
3Strength
If the pivot bolt is pushed back with brute force, then the bolt may be forced into unlocked position, but the hook-shaped bolt prevents distance increase between rebates
Solution Approach 1:
The L-shaped control cam provides preliminary anti-action by preventing the bolt from pivoting back into the unlocked position. The control pin engages the control cam in such a way that any attempt to push the bolt back is counteracted before it can succeed, neutralizing the direct attack force and protecting the locking engagement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively counters push-back attacks by ensuring the swivel bolt's hook jaw engages securely, maintaining the lock's integrity despite wear and bearing play.
Implementation Method 1
a lock with a pivot bolt that pivots forward from a lock housing in its locked position under the influence of a spring
Implementation Method 2
which collides with the swivel bolt's body edge when pushed back, preventing further pivoting
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a lock for a window or a door, comprising a pivot bolt (6) which can be pivoted out of a housing (11) into a locking position about an axis (9) through a bolt passage opening of a faceplate (2) and which engages into a bolt engagement which is stationary with respect to the leaf, wherein, in a locking position of the lock, a hook mouth (15) engages behind a locking edge of the bolt engagement. In order to provide a simply constructed and effective push-back lock, a housing edge (16) is provided which runs perpendicular to the faceplate (2) of the housing (11). This edge, relative to the axis (9) of the pivot bolt (6), lies in the return pivoting direction (R) of the pivot bolt (6) and, in the locking position, projects into the interior of the housing (11) at a short distance (17) from a body edge (18) of the pivot bolt (6).