Compact Switching Device Jump-Off Mechanism
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Solution Overview
Problem
Existing compact switching devices with manual control buttons face issues with safe disconnection at higher voltages and currents, as slow contact separation can lead to electric arcs and potential device failure or fire, and known jump-switch off functions are not suitable for compact designs due to space constraints and potential malfunctions.
Innovation Solution
A compact switching device with a jump-switch off function that activates contact separation regardless of the actuation speed or manner, featuring a switch lock with a latch and latch support, and a connecting rod that releases the latching mechanism when the hand switching lever oversteps a predefined position, ensuring safe separation of contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the contacts are separated slowly during manual opening, then the user can maintain control and avoid sudden movements, but an electric arc occurs between the contacts leading to device damage or fire
Solution Approach 1:
The patent implements a jump-switch off function that rapidly separates the contacts during manual opening, skipping the dangerous intermediate position where an electric arc could occur. The connecting rod mechanism enables the contacts to jump from the closed position directly to the open position, bypassing the arc-prone zone entirely.
Solution Approach 2:
The latch support and latch mechanism are pre-positioned to engage with the hand switching lever at a predefined position before complete opening. This preliminary engagement ensures that once the lever is actuated, the jump-switch off function is automatically triggered, preventing the user from inadvertently maintaining an intermediate position that could cause arcing.
2Speed
If a jump-switch off function is implemented in compact switching devices, then contact separation speed is improved to prevent electric arcs, but the device complexity increases due to additional components
Solution Approach 1:
The patent merges the jump-switch off function components (connecting rod, latch support, latch) with the existing manual control button structure. The hand switching lever serves dual purposes: as the manual control element and as the actuator that triggers the jump-switch off function. This integration minimizes additional complexity while achieving rapid contact separation.
Solution Approach 2:
The connecting rod is designed to serve multiple functions: it connects the hand switching lever to the contact arm, provides the mechanical leverage for rapid separation, and engages with the latch support to enable the jump-switch off function. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity.
3Ease of operation
If the hand switching lever is moved incompletely in the closing direction, then the user can avoid full engagement, but the contacts remain in an intermediate position causing continuous electric arc
Solution Approach 1:
The latch support is pre-positioned to engage with the hand switching lever at a specific point in the closing motion. Once the lever reaches this predefined position, the latch mechanism automatically engages, locking the contacts in either the fully closed or fully open position. This prevents the contacts from remaining in an unstable intermediate position where arcing could occur continuously.
Solution Approach 2:
The latch mechanism provides mechanical feedback to the hand switching lever, creating distinct stable positions for closed and open states. When the lever is actuated, the latch engages or disengages, providing tactile and positional feedback that confirms the contacts are in a stable, non-arcing position. This feedback mechanism eliminates the possibility of the system remaining in an unstable intermediate state.
Data Source
Figure 1~2
Figure 3~5
Figure 6~9
AI summary
A switching device (1) has a housing-mounted contact (6), a movable contact (4), and a switch lock (2) with a latch (20), a latch support (22) and a latching location, wherein the switching device (1) furthermore has a switching lever (7) and a connecting rod (10) is mounted movably on the latch support (22), the connecting rod (10) comprises an end portion bearing against a first projection (11) of the switching lever (7) when the switching lever (7) is arranged in a stationary ON-position, the connecting rod (10) further comprises an actuating shoulder (29) bearing against a second projection (30) of the switching lever (7) when the hand switching lever (7) is in a non-stationary ON-position, with an actuation of the switching lever (7) for separating the contacts (4, 6) moves the connecting rod (10) and thereby releases the latching of the latching support (22) to the latch (20).