Lifting Switch Toggle Structure Without Shaft-Hole Jamming
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Solution Overview
Problem
Conventional control apparatuses for lifting mechanisms rely on a shaft-hole fit structure that demands high precision and smoothness, leading to potential jamming and looseness issues, and are inconvenient to assemble.
Innovation Solution
A control apparatus with a toggle assembly featuring a stop portion-limit portion cooperating structure between sidewalls of the toggle assembly and mount box, allowing for a free and pushed state with an elastically auto-reset lift switch, and utilizing snap-fits and snap grooves for precise vertical limitation, eliminating the need for a rotating shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shaft-hole fit structure is used for the toggle assembly, then the toggle can rotate to implement actuation, but the structure requires high fitting precision and polishing treatment to avoid jam or looseness
Solution Approach 1:
The patent removes the rotary shaft component entirely from the toggle assembly. Instead of having a shaft that rotates within a hole, the toggle assembly directly engages with the switch through a push-button mechanism where the toggle lever pivots on a fixed axis without requiring a separate rotating shaft, thereby eliminating the fitting precision issues between shaft and hole
Solution Approach 2:
Instead of making the shaft rotate within a stationary hole, the invention inverts the approach by having the toggle lever pivot on a fixed axis while the button and switch mechanism remain stationary. The actuation is achieved by pushing the button which rotates the toggle lever about a fixed pivot point, reversing the traditional rotation paradigm
2Reliability
If a shaft-hole fit structure is used for the toggle assembly, then the toggle can rotate to implement actuation, but the assembly becomes inconvenient and complex
Solution Approach 1:
The patent merges the functions of the rotary shaft, toggle lever, and actuation mechanism into a single integrated toggle assembly. The toggle lever itself serves as both the actuating lever and the rotating element, eliminating the need for separate shaft and hole components, thereby simplifying the overall structure while maintaining reliable actuation
Solution Approach 2:
The toggle lever in the invention serves multiple functions simultaneously: it acts as the actuating lever, the rotating element, and the mechanical linkage to the switch. This multi-functional design eliminates the need for separate dedicated shaft and toggle components, reducing structural complexity while ensuring reliable operation
3Manufacturing precision
If the limit portion is staggered with the lift switch in the depth direction, then the three points form a plane with determined position to limit rotation and vertical movement, but the structure becomes more complex
Solution Approach 1:
The patent addresses the limiting function by transitioning from a single-plane constraint to a three-dimensional constraint system. The stop portion and limit portion are positioned at different depths along the Z-axis, creating a spatial plane that simultaneously constrains both rotation and vertical movement. This dimensional approach provides precise limiting through geometric configuration rather than complex mechanical components
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 provides enhanced limit strength, reduces assembly complexity, and improves stability and precision while simplifying manufacturing, enabling automatic obstacle avoidance and reducing costs.
Implementation Method 1
the circuit board comprising a lift switch which is elastically auto-reset and configured to control lifting
Data Source
AI summary
A control apparatus for a lifting mechanism, including: a mount box, a circuit board, and a toggle assembly, the circuit board including a lift switch which is elastically auto-reset and configured to control lifting, the toggle assembly being operable by pushing to close the lift switch. a limit portion is provided on each of two sidewalls of the toggle assembly, the limit portion being staggered with the lift switch along a depth direction of the toggle assembly and vertically movable with the toggle assembly; and a stop portion is provided on each of two sidewalls of the mount box; the toggle assembly includes a free state in which the stop portion vertically stops the limit portion and a pushed state in which the toggle assembly rotates about a pivot point which is a contact point between the stop portion and the limit portion.