Limit Switch Projection for Lead Wire Routing
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Solution Overview
Problem
Conventional limit switches face inefficiencies in connecting lead wires to upper stage fixed contact terminals, particularly for thick wires in narrow spaces, requiring complex folding and reducing work efficiency.
Innovation Solution
The limit switch design includes a projection that facilitates wiring by allowing lead wires to be routed through it, with upper stage fixed contact terminals arranged to project towards the lower stage, creating a step and using insulating walls to prevent direct contact with the housing, and crimped terminals connected via screws for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lead wires are connected to upper stage fixed contact terminals in conventional limit switches, then connection is achieved, but routing work becomes complex and work efficiency deteriorates
Solution Approach 1:
The patent introduces a projection structure that extends from the upper stage housing toward the lower stage, creating a new spatial dimension for wire routing. This projection provides a dedicated pathway that guides lead wires from the lower stage connection holes to the upper stage contact terminals, transforming a complex 3D routing problem into a simpler guided path along the projection surface.
Solution Approach 2:
The projection acts as an intermediary structure between the lower stage connection points and upper stage contact terminals. It provides a intermediate routing surface that facilitates wire transition between stages, eliminating the need for complex folding and routing maneuvers in the narrow space between stages.
2Ease of operation
If thick lead wires are routed in narrow spaces, then connection is achieved, but complicated folding is required which degrades work efficiency
Solution Approach 1:
The projection creates an additional routing dimension that accommodates thick lead wires without requiring them to fold within the narrow horizontal space between stages. Wire can travel along the projection's extended surface, providing sufficient space for thick wire bending radius while maintaining efficient routing.
3Device complexity
If fixed contact terminals are arranged vertically in two stages, then compact design is achieved, but insulating characteristics may deteriorate
Solution Approach 1:
The patent segments the housing into distinct upper and lower stages using a projection structure. This projection acts as a physical partition that electrically isolates the upper stage contact terminals from the lower stage, maintaining insulating characteristics while enabling the compact two-stage vertical arrangement.
Solution Approach 2:
The projection serves as an insulating intermediary between the upper and lower stages. It physically separates the conductive elements of different stages while maintaining the compact vertical structure, preventing electrical breakdown between stages.
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3
AI summary
The purpose of the invention is to provide a limit switch that facilitates lead wire connection work and has good work efficiency. To achieve said purpose, the invention is the limit switch, which: affixes a switch body (20) within a housing (10) having an opening (11) on the front surface thereof; on the bottom surface of the housing (10), has connection holes admitting lead wires (70-73); partitions the front surface of the switch body (20) into multiple upper/lower sections; embeds a pair of fixed contact terminals (25, 26, 27, 28) in each section; and opens/closes a contact by driving an operation shaft (30) exposed from the top surface of the switch body (20), said operation shaft (30) being driven in an axial direction. A first projection (22) is extendingly provided between fixed contact terminals (25, 26), and a second projection (23) is extendingly provided between fixed contact terminals (27, 28), said fixed contact terminals (25, 26, 27, 28) being embedded in the sections of the front surface of the switch body (20).