Oblique Limit Switch Mechanism for Reduced Wear
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Solution Overview
Problem
Conventional limit switch mechanisms experience reduced service life due to misaligned force components causing unnecessary stress and wear, and they often cannot accommodate the increased number of limit switches required for advanced control and monitoring functions within space limitations.
Innovation Solution
A limit switch mechanism featuring a base frame with oblique slits and punched-up portions that align control levers radially with switch actuators, reducing tangential force and allowing for increased switch actuator alignment, along with a latch mechanism for axial movement and adjustment, enabling longer service life and accommodating more switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control levers are positioned horizontally in the path of switch actuators, then the limit switch mechanism can control door stroke limits, but the misaligned force components cause unnecessary stress and wear on control levers and actuators, reducing service life
Solution Approach 1:
The control levers are repositioned from horizontal to oblique angles, creating an asymmetric arrangement where the lever deflection direction aligns with the actuator force direction. This asymmetric positioning eliminates the perpendicular force component that caused wear, while maintaining the limit control function.
Solution Approach 2:
The angular parameter of control lever positioning is changed from horizontal (0 degrees) to oblique angles. By adjusting this geometric parameter, the force alignment between actuators and levers is optimized, eliminating misaligned stress components and extending service life.
2Adaptability or versatility
If the number of limit switches is increased to meet advanced control and monitoring requirements, then more functions can be provided, but the space available in the conventional horizontal arrangement is limited
Solution Approach 1:
The control lever arrangement transitions from a two-dimensional horizontal plane to a three-dimensional oblique configuration. By utilizing the vertical and angular dimensions, the mechanism can accommodate more switches within the same footprint, as levers are stacked at different angles rather than spread horizontally.
Solution Approach 2:
Multiple limit switches are arranged in a nested configuration where levers are positioned at different oblique angles, allowing compact integration. The oblique arrangement enables levers to be stacked more efficiently, similar to nesting objects, maximizing the number of switches within limited space.
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 mechanism ensures positive actuation with reduced wear, extending the service life of limit switches and actuators, and allows for a higher number of switches to be integrated, enhancing reliability and meeting advanced control requirements.
Implementation Method 1
The switch actuator restraining edge 48a of a plate 48 of the latch means 46 is normally biased, by a torsion spring 52, to engage in one of the radially extending slots 32c and 34c formed on the switch actuator 32 and 34 to restrain relative rotation with respect to the shaft 28.
Implementation Method 2
A shaft 28 extending through the sidewall 12b of the frame 12 at a location where journal bearings are provided to mount the shaft 28 for rotation with point Or as the center, and having a threaded portion 28b, engages with two switch actuators 32 and 34 received thereon.
Data Source
AI summary
An improved limit switch mechanism is provided in which it includes a plurality of cassettes of limit switch subassembly, each cassette containing: a limit switch mounting bracket, a first limit switch and a second limit switch fastened onto said limit switch mounting bracket by screws; the deflection direction of the control lever of each limit switch being directed radially towards the center of the concerned switch actuator when each cassette of limit switch subassembly is inserted and fixed in a pair of slits, which is inclined at certain angle relative to horizontal direction and provided on opposite side walls of the base frame. Accordingly, positive actuation on control lever of each limit switch and long service life of each limit switch can be achieved.