Lockable Safety Switch Plunger with Offset Linkage
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Solution Overview
Problem
Existing safety switches with lockable mechanisms are restricted in shape and face challenges in manufacturing due to the complex arrangement of numerous co-operating elements, requiring tight tolerances that are difficult to consistently meet, leading to potential operational issues.
Innovation Solution
A safety switch mechanism with a lockable switch plunger and a simplified locking mechanism, where the second locking member is attached to the contact block plunger via a linking member, allowing for easier construction and flexibility in design, reducing the need for precise tolerances and elongated shape constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lockable switch mechanism with multiple co-operating elements is used, then the switching function is reliable, but the manufacturing tolerances required are very small and the overall shape is restricted
Solution Approach 1:
The patent combines the locking mechanism and switch actuation into a single integrated assembly where the plunger serves dual functions. The locking elements (locking cam, locking lugs) are merged with the switch plunger structure itself, eliminating the need for separate locking components and reducing the number of tolerance-critical interfaces between parts.
Solution Approach 2:
The switch plunger serves multiple functions simultaneously: it acts as the locking element, the actuating element, and the mechanical linkage. The profiled surface of the plunger performs both locking engagement and switch activation, reducing the need for precisely fitted separate components.
2Reliability
If multiple co-operating elements are used in the locking mechanism, then the locking function is secure, but the number of elements increases complexity
Solution Approach 1:
The patent merges multiple functions into fewer elements. The plunger integrates locking, actuating, and linkage functions. The locking cam and locking lugs are formed as integral parts of the plunger assembly rather than separate components, reducing overall complexity while maintaining secure locking.
3Reliability
If the safety switch uses a traditional locking arrangement, then the switching mechanism is reliable, but the overall shape is restricted to elongated forms
Solution Approach 1:
The patent repositions the contact block laterally adjacent to the plunger rather than in-line, allowing the mechanism to accommodate non-elongated shapes. The locking elements engage radially or laterally rather than purely axially, enabling more flexible housing geometries while maintaining reliable switching.
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 enhances the reliability and ease of construction of safety switches by reducing the complexity of the locking mechanism, allowing for a more flexible design and improved operational performance without the need for precise tolerances, thus addressing the limitations of prior art.
Implementation Method 1
a first locking member which is biased against a surface of the switch plunger
Data Source
AI summary
A lockable safety switch mechanism having a lockable switch mechanism that cooperates in an offset or skewed manner with an electrical switch. The lockable switch mechanism includes a switch plunger that is displaceable along a predetermined axis between a first position and a second position. A contour is formed along the switch plunger and cooperates with one or more locking mechanisms. A fork cooperates with the locking mechanism so as to selectively interfere with free movement of the switch plunger depending on the interaction between the contour and the locking mechanism. A link extends from one of the locking mechanism and the fork and interacts with a plunger of an electrical switch contact carrier so that an axis of movement of the switch plunger can be offset or skewed relative to an axis of movement of the electrical switch plunger.