Strike Plate Ramp Spring for Bolt Pretensioning
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Solution Overview
Problem
Existing strike plates for window or door sashes face challenges in achieving high frictional resistance, precise pretensioning force, and stability due to high frictional resistance, lack of preload, and low stability in supporting forces.
Innovation Solution
A strike plate design featuring a spring element in the shape of a ramp, directly supporting the bolt within a recess, with the spring element supported on a holding element connected to the cover plate, allowing precise pretensioning and high stability by minimizing friction and enabling uniform preload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cup-shaped guide element is adjusted relative to the cover plate via an eccentric supported on spring elements, then tolerance compensation is enabled, but the strike plate has very high frictional resistance
Solution Approach 1:
The harmful frictional interface between the guide element and spring elements is eliminated by extracting the guide function from the spring element arrangement. The new design uses a separate guide element that guides the bolt directly, while the spring element acts only as a preload generator, removing the source of high friction.
Solution Approach 2:
The strike plate is divided into distinct functional components: a guide element for precise bolt positioning, a spring element for preload generation, and a separate mounting structure. This segmentation allows each component to perform its function optimally without interfering with others, reducing friction while maintaining tolerance compensation.
2Force
If a spring element is arranged between the guide element and base body, then pretensioning force is provided, but the mounting has frictional resistance that prevents precise pretensioning
Solution Approach 1:
A new intermediate structure (the guide element with integrated spring mounting) is introduced to mediate between the spring element and the base body. This intermediary provides a low-friction interface that allows the spring element to transmit its preload force precisely to the bolt without the friction that previously contaminated the force transmission path.
3Force
If a cylinder or roller protrudes as the only component in the direction of movement, then the latch forces are supported, but the strike plate has only low stability
Solution Approach 1:
The guide element and spring element are merged into a single integrated component that performs both guidance and preload functions simultaneously. This combination creates a more stable structure that can support latch forces effectively while maintaining high positional stability, eliminating the need for a separate roller component.
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
This design ensures precise pretensioning force application, high stability, and easy assembly, with the ability to compensate for installation tolerances and provide robust protection against forced entry.
Implementation Method 1
a spring element which biases the guide element against the bolt in the closed position
Implementation Method 2
the spring element has the shape of a ramp which guides the bolt, that the ramp protrudes directly into the recess
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
In a strike plate (8) for a locking rod fitting (3), a spring element (12) for supporting a bolt (7) in the locked position is formed by a leaf spring. The spring element (12) has the shape of a ramp (13) and thus forms a guide element (14) for the bolt (7). The spring element (12) is clamped between a cover plate (10) and a base body (9).