Auxiliary Lock Hook Bolt Blocking Flank Security
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Solution Overview
Problem
Existing locks with hook bolts lack sufficient locking security, as they can be improperly displaced from the pre-closed to the re-closed position, compromising their locking integrity.
Innovation Solution
A secondary lock with two hook bolts, each having a blocking edge, is designed with a blocking element that pivots from a non-blocking to a blocking position, intersecting the movement path of the hook bolts, and is controlled by a drive slide with a cam mechanism, ensuring the hook bolts are locked in place until an idle stroke allows the locking element to pivot out of its blocking position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a lock with two hook bolts is used without a blocking element, then the structure is simple and ease of manufacture is improved, but locking security deteriorates because the hook bolts can be improperly displaced from the pre-closed to the re-closed position
Solution Approach 1:
The blocking element is rotatably mounted within the lock case, nesting a additional security mechanism inside the existing lock structure without requiring a separate external blocking device. This nested approach adds security while minimizing structural complexity and manufacturing requirements
Solution Approach 2:
The blocking element is positioned to preemptively prevent improper displacement of the hook bolts before such displacement can occur. By having the blocking element ready in the lock case, the system prevents unauthorized transitions from pre-closed to re-closed position rather than reacting after the fact
2Reliability
If a blocking element is added to prevent improper displacement of hook bolts, then locking security is improved, but device complexity increases
Solution Approach 1:
The blocking element is designed to be automatically actuated by the normal operation of the drive slide and hook bolts. During proper locking operation, the drive slide's movement automatically rotates the blocking element into and out of blocking positions without requiring separate control mechanisms, allowing the system to self-regulate its security state
Solution Approach 2:
The blocking element's function is merged with the existing drive slide mechanism. The same drive slide that moves the hook bolts also, through its idle stroke, actuates the blocking element. This combines two functions (moving hook bolts and controlling the blocking element) into a single mechanical action, reducing overall system complexity
3Reliability
If the blocking element is constantly in blocking position, then locking security is maximized, but ease of operation deteriorates because intentional release becomes difficult
Solution Approach 1:
The blocking element operates periodically, alternating between blocking and non-blocking states based on the drive slide's movement cycle. During normal operation, the drive slide's idle stroke periodically rotates the blocking element out of the blocking position to allow intentional release, then returns it to blocking position to maintain security, creating a rhythmic enable/disable cycle
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
Enhances locking security by preventing improper displacement of the hook bolts from the pre-closed to the re-closed position, ensuring the lock remains secure until intentionally released, thereby increasing the overall locking security of the system.
Implementation Method 1
The locking element is preferably cam-controlled and displaceable between its end positions
Implementation Method 2
For this purpose, the drive slide performs a free stroke without the hook bolts being rotated. During this free stroke, the locking element disengages from its locked blocking position and is pivoted, at least slightly, out of the blocking position
Implementation Method 3
a control section of the locking element slides along a control flank of the drive slide
Data Source
Figure 1~1a
Figure 2~3
Figure 4~5
AI summary
The invention relates to a lock, in particular a secondary lock, with two hook bolts (3, 4) rotatably mounted in a lock case (1) about a pivot axis, each having a hook section (3', 4') which, controlled by a drive slide (2), can be moved in opposite directions of rotation through a bolt passage opening (12) of a faceplate (5) from a closed position to a forward-locked position. To improve locking security, it is proposed that each of the two hook bolts (3, 4) has a blocking flank (6, 7) to which a locking flank (10) of a locking element (8) is opposite in the forward-locked position such that, when torque is applied to the hook sections (3', 4') in the closed position, the blocking flanks (6, 7) engage against the locking flanks (10) in a rotationally locking effect.