Switch Contact Unit Angled Actuation for Window Sealing
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Solution Overview
Problem
Existing switching contact units for windows and doors face challenges in easy installation, reliability under wind loads, and precise sealing detection, with existing solutions either being time-consuming to assemble or prone to false triggering due to wind and temperature changes.
Innovation Solution
A switching contact unit with a movably mounted switching contact bolt approximately at right angles to the window frame profile, where the microswitch scans the circumference of the bolt, and a spring element displaces the bolt to trigger the microswitch, with a conical transition to prevent catching and an angled actuation direction for improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a microswitch is directly actuated by an edge of the window sash, then the switching contact unit can detect the opening status, but the direct actuation is difficult to adjust and prone to false triggering under wind loads
Solution Approach 1:
A switching contact bolt serves as an intermediary between the sash edge and the microswitch actuating element. The bolt is movably mounted and can be displaced by the sash edge, but transfers this motion to the microswitch through a controlled interaction where the bolt's end face acts on the microswitch plunger. This intermediary mechanism allows indirect actuation that is easier to adjust and less sensitive to wind load variations.
Solution Approach 2:
The switching contact bolt is oriented approximately at right angles to the longitudinal extension of the window frame profile, creating a different spatial dimension for the actuation mechanism. This perpendicular mounting arrangement allows the bolt to scan the circumference of the sash edge, providing a more stable geometric relationship that reduces false triggering.
2Device complexity
If the actuating element is exactly perpendicular to the switching contact bolt with a short conical shoulder, then the structure is simple, but considerable transverse forces act on the plunger
Solution Approach 1:
The actuation geometry is made asymmetric by angling the actuating element relative to the switching contact bolt rather than maintaining exact perpendicularity. This asymmetric arrangement, with the actuating element inclined at an angle between 45° and 60°, creates a more favorable force distribution that reduces transverse forces on the plunger while maintaining structural simplicity.
3Ease of operation
If reed relays are attached to the window frame with permanent magnets on the sash, then concealed attachment is achieved, but assembly is time-consuming and adhesives are not permanently durable
Solution Approach 1:
The switching contact unit is segmented into separate functional components: a mounting component that attaches to the window frame, and a switching contact bolt that can be separately assembled. This segmentation allows the mounting component to be pre-installed in a concealed manner, while the switching contact bolt can be independently positioned and adjusted, reducing overall assembly time and complexity.
4Ease of manufacture
If the switching contact unit is mounted on the window frame, then cable connections are simplified, but the actuating element must reliably scan the sash edge under various conditions
Solution Approach 1:
The switching contact bolt is designed to be movably mounted rather than fixed, allowing it to dynamically adjust its position as the sash moves. The bolt can scan the circumference of the sash edge and maintain reliable contact throughout the opening and closing cycle. This dynamic capability ensures sensing reliability while the frame mounting simplifies cable connections.
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 solution enables easy and reliable detection of the sealing closed position, enhances service life, and prevents false triggering, ensuring accurate switching even under wind loads and temperature variations.
Implementation Method 1
The switching contact pin is pressed against the sash by a spring element and is displaced when the sash is moved away from the frame
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Switching contact unit (10) for mounting on a rebate (22, 32) between a frame and a window or door sash, comprising at least: - a base housing (11) with fastening means (12) for attachment to the frame or sash; - a switching contact bolt (14) designed to bear against the frame or sash, which is slidably mounted in a bolt guide recess (11.3) in the base housing (11) against the force of at least one spring element; - an electrical microswitch element (15) arranged in the base housing (11) with an actuating element (16) movable relative to a microswitch housing; The switching contact bolt (14) is provided in the area of its length swept by the actuating element (16) of the microswitch element (15) with a switching section (14.4) which has a diameter different from that of a base section (14.2), at which the microswitch element (15) can be switched.The actuation direction (B) of the actuating element (16) is oriented at an angle between 60° and 85° to the displacement direction (V) of the switching contact bolt (14). A conical transition is formed between the base section (14.2) and the switching section (14.4).