Riser Hinge With Removable Strap Bearings
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Solution Overview
Problem
Heavy-duty door hinges, especially riser type hinges, face premature wear due to caroming components, leading to operational issues and the need for entire hinge replacement when internal bearings wear out.
Innovation Solution
A hinge design featuring a mounting flange with upper and lower hinge arms, a strap assembly with a cylinder portion having an elongated slot and asymmetrical cam and cam follower components made of low-frictional materials, allowing for removable and replaceable strap bearings to mitigate wear and maintain functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire hinge is replaced when internal bearings wear out, then the hinge reliability is restored, but the cost and complexity of maintenance increases
Solution Approach 1:
The hinge is divided into separable components: the mounting flange assembly and the strap assembly connected by a pin. The strap bearings are further segmented as removable components within the strap assembly. This segmentation allows individual replacement of worn strap bearings without replacing the entire hinge, reducing maintenance complexity while restoring reliability.
Solution Approach 2:
The strap bearings are extracted as removable components from the strap assembly. The locking flange mechanism allows the strap bearing to be removed from the cylinder portion through the elongated slot. This extraction enables selective replacement of only the worn bearing component rather than the entire hinge assembly.
2Reliability
If the entire hinge is replaced when internal bearings wear out, then the hinge reliability is restored, but the time and resource consumption increases
Solution Approach 1:
The hinge is divided into separable components with the strap bearing as a removable element. This segmentation enables quick replacement of only the worn bearing component, significantly reducing maintenance time compared to replacing the entire hinge assembly.
Solution Approach 2:
The worn strap bearing is discarded and replaced with a new one, while the rest of the hinge assembly (mounting flange, strap, cylinder portion) is recovered and reused. This selective replacement minimizes waste and reduces maintenance time and resources.
3Ease of operation
If riser type hinge with caroming components is used to lift the door, then the door can be lifted when swung open, but the wear on internal bearings increases due to forced rising
Solution Approach 1:
The caroming mechanism is segmented into a cam component and a cam follower component with replaceable strap bearings. This segmentation allows the caroming function to be maintained while enabling easy replacement of worn bearings, thus preserving bearing durability through maintainability.
Solution Approach 2:
The cam profile parameters are optimized to provide the desired door lifting motion while reducing impact forces and wear on the strap bearings. The elongated slot geometry is also parameterized to allow bearing replacement without changing the overall hinge dimensions.
4Duration of action of moving object
If strap bearings are made removable and replaceable, then the lifespan of the hinge is extended, but the device complexity increases
Solution Approach 1:
The strap bearing is segmented as a removable component with a locking flange that interfaces with the cylinder portion's elongated slot. This segmentation enables replacement while keeping the overall assembly relatively simple through standardized interfaces.
Solution Approach 2:
The locking flange acts as an intermediary component between the strap bearing and the cylinder portion. It provides a simple mechanical interface (narrow portion fitting in narrowed slot, enlarged portion in enlarged slot) that enables removable connection without complex fastening mechanisms.
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 design extends the lifespan of heavy-duty hinges by allowing for easy replacement of worn components, preventing premature failure and maintaining smooth door operation, while the asymmetrical cam and cam follower configuration ensures proper door alignment and extended contact surfaces for enhanced rotation.
Implementation Method 1
asymmetrical cam and cam follower components made of low-frictional materials
Data Source
AI summary
A riser hinge (10) is disclosed which includes a mounting flange assembly (12) pivotally coupled to a strap assembly (15). The cylindrical portion (52) includes an upper strap bearing (54) and a lower strap bearing (55) which are each mounted partially within the cylindrical portion. The strap cylinder portion has a space (82) which includes an enlarged portion (83) flanked by narrowed portions (84) at stop ledges (85). The upper strap bearing and lower strap bearing each have a vertically oriented, elongated, locking tongue or flange (87) with a narrowed portion (88) extending to an enlarged portion or stop (89), which enables them to be removably mounted within the space.