Hook Bolt Door Lock Anti-Burglar Design
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Solution Overview
Problem
Existing hook bolt door locks face issues with uncertain operation due to gravity and friction, inadequate anti-burglar properties, especially under lateral tensile loads, and vulnerability to breaking attempts.
Innovation Solution
The design incorporates side elements and a widened body part with cutouts to enhance strength, blocking elements to prevent withdrawal, and a control mechanism for secure hook part operation, ensuring the hook bolt is securely engaged with the striker plate and resistant to breaking attempts by distributing loads across multiple corners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a simple hook bolt design is used, then the device complexity is low, but the anti-burglar properties and strength under tensile load are insufficient
Solution Approach 1:
The hook bolt is divided into distinct functional components: a body part, multiple hook parts (at least two), and blocking elements. This segmentation allows each component to perform its specific function - the body part provides structural strength, the hook parts engage with the striker plate, and the blocking elements prevent withdrawal - while collectively achieving superior anti-burglar properties without requiring a monolithic complex structure
Solution Approach 2:
The patent combines multiple functional elements into a single integrated hook bolt assembly. The body part, hook parts, and blocking elements are merged into one cohesive unit that operates together to provide both simplicity of operation and enhanced security. This merging achieves high strength properties without proportionally increasing device complexity
2Ease of operation
If hook parts are pivotally mounted to allow turning movement, then the ease of operation is improved, but friction forces may cause the hook bolt to become jammed
Solution Approach 1:
The patent extracts the turning guidance function from the pivot mechanism itself and relocates it to the striker plate opening. The top edge of the striker plate opening actively guides the hook parts during turning movement, while the pivot provides only the necessary support. This extraction reduces the pivot's frictional resistance and prevents jamming, while maintaining ease of operation through the guided turning motion
Solution Approach 2:
The striker plate opening acts as an intermediary element that mediates between the hook parts and the pivot. Instead of the hook parts directly interacting with the pivot in a high-friction relationship, the striker plate opening provides a low-friction guiding surface that facilitates smooth turning movement while maintaining reliable operation
3Stability of the object's composition
If the hook bolt is designed to be compact, then the device complexity is low, but it can be detached from the striker plate when locked
Solution Approach 1:
The patent extends the hook bolt in the longitudinal dimension, making the body part longer than conventional compact designs. This increased length allows the blocking elements to be positioned strategically to prevent withdrawal of the hook parts from the striker plate opening. The extended structure achieves superior locking stability without requiring complex multi-dimensional mechanisms
Solution Approach 2:
The blocking elements are pre-positioned on the body part to anticipate and prevent potential withdrawal of the hook parts. This preliminary arrangement of blocking elements ensures that even if the hook parts attempt to disengage, they are stopped by the blocking elements before detachment can occur, providing inherent locking stability without complex additional mechanisms
Data Source
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AI summary
A door lock (1) having a lock body (2) equipped with a front plate (3), said lock body including a hook bolt (4) movable between the locking and released position with a key, the hook bolt being arranged to cooperatewith a striker plate (11) in the door frame so that in its locking position, the hook bolt (4) is pushed into the striker plate opening (11a) and its hook part (6) is turned towards the inner surface of the striker plate (11). The hook bolt (4) comprises a plate-like body part (5) with hook parts (6) pivotably mounted on both sidesthereof, and in the locking position of the hook bolt (4), the body part (5) together with the hook parts (6) extends into the striker plate opening (11a). The body part (5) is furnished with side elements (8) arranged at the positions of the hook parts (6), and in the locking position of the hook bolt (4), the side elements (8) together with the body part (5) and the hook parts (6) are arranged to substantially fill the striker plate opening (11a). Furthermore, in the lengthwise direction of the front plate (3), the body part (5) is dimensioned so that in its locking position, it is wider at the front plateopening (3a) compared to other parts of the hook bolt (4), and the front plateopening (3a) has a separate cutout (3b) for thebody part (5) preferably at both the top edge and the bottom edge of the opening.