Electric Switch Assembly Kinematic Chain Locking
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Solution Overview
Problem
Existing electrical switching arrangements face difficulties in simplified and safe operation of the blocking device, requiring coordination of the electrically insulating handle and locking pin, and can only secure two predetermined relative positions of switching contact pieces.
Innovation Solution
The blocking element secures the relative position of switching contact pieces in either the on or off state by locking at least one machine element of the kinematic chain in different positions, using a blocking device with a blocking element that can engage multiple positions, and is actuated using a tool for enhanced safety and ease of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking element is used to secure relative positions of switching contact pieces, then reliability of position securing is improved, but ease of operation deteriorates due to coordination requirements between handle and locking pin
Solution Approach 1:
The patent combines the blocking element and the handle into a single integrated component. The blocking element is formed as an extension of the handle itself, eliminating the need for separate coordination between handle operation and locking pin insertion. When the handle is moved to a switching position, the blocking element automatically engages with the corresponding blocking surface on the kinematic chain, providing both the securing function and the operational simplicity in one action.
2Manufacturing precision
If a blocking device with fixed blocking element geometry is used, then manufacturing precision is improved, but adaptability deteriorates as only two predetermined positions can be secured
Solution Approach 1:
The patent makes the blocking element geometrically dynamic by forming it as a curved surface extension of the handle rather than a fixed-point pin. This curved blocking surface can engage with multiple discrete blocking surfaces at different angular positions on the kinematic chain. The same blocking element structure adapts to multiple positions through its geometry, allowing the system to secure various switching positions without requiring multiple specialized blocking components.
Data Source
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AI summary
An electrical switching arrangement comprises a first and a second switching contact (7, 8). The switching contacts (7, 8) are movable relative to each other. A movement can be coupled to at least one of the switching contacts (7, 8) via a kinematic chain (11, 12, 13, 14). A locking element (26) of a locking device (25) is capable of locking at least one machine element (12) of the kinematic chain in different positions, whereby the switching state of the electrical switching arrangement remains essentially unchanged.