Top Pin Door Assembly with Integral Hold Open Mechanism
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Solution Overview
Problem
Existing traffic door hinge assemblies do not effectively maintain the door in open positions without external devices, particularly for high-traffic areas where bulky or heavy loads are involved, and they lack the ability to restrain the door in positions oriented at right angles relative to the closed position.
Innovation Solution
A top pin assembly that includes a hinge bracket with rollers and a support plate with centering notches and restraining slots, allowing the door to be positively restrained in both closed and open positions, including 90-degree orientations, eliminating the need for external devices to maintain the door open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hinge assemblies are used, then the door can swing freely, but the door cannot be maintained in open positions without external devices
Solution Approach 1:
The patent combines the hinge assembly and door restraining function into a single integrated top pin assembly. The support plate with restraining slots is integrated into the hinge mechanism, eliminating the need for separate external restraining devices. This merging resolves the contradiction by providing both free swinging motion and automatic position maintenance within one unified structure.
Solution Approach 2:
The top pin assembly automatically maintains the door in open positions through its own integrated restraining slots and rollers, without requiring external devices or additional mechanisms. The assembly serves itself by using gravity and its own structural features to hold the door at desired positions, resolving the contradiction between ease of operation and device complexity.
2Reliability
If external restraining devices are added to maintain door open, then the door can be held in open positions, but the device complexity increases
Solution Approach 1:
The restraining function is merged into the hinge assembly itself through the integrated support plate with restraining slots. This eliminates the need for separate external restraining devices while maintaining reliable door position control. The contradiction is resolved by achieving both reliability and simplicity through integration.
3Productivity
If the door is designed for high-traffic flow, then traffic movement is facilitated, but the door cannot restrain positions for bulky or heavy loads
Solution Approach 1:
The top pin assembly performs multiple functions: it allows free swinging for high-traffic flow and simultaneously provides automatic position maintenance for doors with bulky or heavy loads. The restraining slots are positioned to accommodate both rapid passage and stable holding, resolving the contradiction between productivity and reliability.
4Reliability
If separate external restraining devices are used, then the door can be held open, but the overall system complexity and installation requirements increase
Solution Approach 1:
The restraining mechanism is combined with the hinge assembly into a single integrated unit. This eliminates the need for separate external devices and simplifies installation, as only one assembly needs to be installed rather than multiple separate components. The contradiction between reliability and ease of manufacture is resolved through integration.
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 top pin assembly ensures free traffic flow by automatically holding the door in fully open positions until manually closed, providing integral restraint without additional devices and facilitating easy return to the closed position with minimal resistance.
Implementation Method 1
the hinge assemblies disclosed in these patents use a roller assembly which generates a closing action on the doors by gravity acting upon the door itself
Data Source
AI summary
An improved top pin assembly is provided for a traffic door which integrally is provided with a hold open device for maintaining the door in either one of opposite fully open positions.