Dual-Door Assembly With Hand-Release Safety Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing door assemblies in waste disposal industry, particularly those resembling guillotines, pose a significant safety risk as they can pinch users' hands, leading to potential injury or damage due to continuous downward movement even after hand entrapment.
Innovation Solution
A door assembly design featuring a guide frame unit with parallel guide tracks, an inner door with a locking part, and an outer door with a second locking part, allowing the outer door to move freely in response to external forces opposite to its movement direction, enabling easy hand removal and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single door is used to open and close the inlet/outlet of the tunnel unit, then the device complexity is reduced, but the safety is compromised because the door cannot respond to external forces opposite to its movement direction
Solution Approach 1:
The single door is divided into two separate doors: an inner door that blocks the inlet/outlet and an outer door that provides safety protection. The inner door is driven by the drive unit to open and close the tunnel, while the outer door is positioned above the inner door and can move independently in response to external forces, allowing users to free their hands without requiring complex sensors or emergency mechanisms
Solution Approach 2:
The outer door acts as an intermediary safety mechanism between the user and the inner door. When a user's hand is pinched, they can apply force to the outer door to move it upward, freeing their hand, while the inner door continues its operation. This intermediary structure resolves the contradiction by adding safety functionality without requiring complex control systems
2Ease of operation
If the door is designed to move freely in response to external forces, then the ease of operation is improved for hand removal, but the reliability of the door's positioning may be compromised
Solution Approach 1:
The door system is segmented into an inner door for positioning and an outer door for safety operations. The inner door maintains reliable positioning through the drive unit and locking parts, while the outer door is designed to move freely in response to external forces applied by users, allowing easy hand removal without compromising the inner door's positioning reliability
Solution Approach 2:
The outer door is designed with dynamic characteristics, allowing it to move upward in response to external forces applied by users. This dynamic design enables easy hand removal while the inner door maintains its positioning through the drive unit and locking mechanism, resolving the contradiction between ease of operation and positioning reliability
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A door assembly is provided. The door assembly includes: a guide frame unit including a first guide track and a second guide track spaced apart from and disposed in parallel with the first guide track; an inner door disposed to be upwardly and downwardly movable along the first guide track and provided with a first locking part protruding in a first direction at a lower end; an outer door disposed to be upwardly and downwardly movable along the second guide track and provided with a second locking part protruding in a second direction from above a point at which the first locking part is formed; and a drive unit configured to move the inner door upwardly and downwardly, wherein the second locking part is formed to contact the first locking part as the inner door moves upwardly.