Adjustable Hinge Assembly for Low-Wear Sash Removal
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Solution Overview
Problem
Existing hinge assemblies face challenges with difficult installation and removal of sashes, potential damage from bending stress, and accelerated wear of pin and screw surfaces due to friction, particularly in three-member designs.
Innovation Solution
A hinge assembly design featuring a transverse adjustment screw, eccentric bushings, and polymer sliding caps to facilitate easy and safe installation and removal, with minimal components, and improved thermal performance and tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-member hinge assembly with polymer bushings is used to reduce friction, then wear resistance is improved, but installation and removal difficulty increases
Solution Approach 1:
The hinge assembly is divided into three distinct members (first hinge member, second hinge member, and third hinge member) that can be independently assembled and disassembled. Each member contains specific components (bushings, pins, locking elements) that can be separately installed, allowing the sash to be removed by detaching individual members rather than the entire assembly, thereby reducing installation complexity while maintaining wear resistance through the polymer bushings in each segment.
2Ease of operation
If longitudinal adjustment screws are used to enable pin retraction, then ease of operation is improved, but frictional wear accelerates
Solution Approach 1:
A polymer bushing is introduced as an intermediary component between the longitudinal adjustment screw and the hinge pin. This bushing acts as a mediator that transfers the adjustment force while protecting the screw threads and pin surface from direct frictional contact. The bushing's self-lubricating properties reduce wear on the screw and pin, allowing repeated pin retraction operations without accelerating wear, thus maintaining both ease of operation and reliability.
3Reliability
If bottomed bushings are used to eliminate friction, then wear resistance is improved, but pin movement capability is lost
Solution Approach 1:
Different types of bushings are used in different locations within the hinge assembly. Bottomed bushings (with closed ends) are installed in the first and third hinge members where friction reduction is needed but pin insertion/removal does not occur. In the second hinge member, where pin movement is required, a through-bushing (with open ends) is used instead, allowing the pin to pass through freely. This localized differentiation allows the system to simultaneously achieve wear resistance where needed and maintain pin movement capability where required.
4Device complexity
If sash removal requires lifting and sliding vertically upward, then manufacturing simplicity is maintained, but safety and ease of operation worsen
Solution Approach 1:
The hinge assembly incorporates a dynamic pin retraction mechanism using longitudinal adjustment screws that can move the pin along its axis. During installation or removal, the operator can retract the pin horizontally using the adjustment screws, allowing the sash to be detached without vertical lifting. This dynamic adjustment capability transforms the static pin position into a movable one, enabling safe and easy sash removal while maintaining relatively simple manufacturing processes.
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
Enables easy, quick, and safe installation and removal of sashes, reduces wear on pin and screw surfaces, and enhances thermal performance and tightness.
Implementation Method 1
A polymer sliding cap is disposed between the front surface of the hinge pin and said longitudinal adjustment screw
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3
AI summary
The invention relates to a hinge assembly (1a, 1b) comprising a first hinge member (2) having a hinge housing (21), within which a longitudinal cylindrical hinge pin (22) defining a longitudinal axis (A) is mounted, and a mounting housing (23) connected with the hinge housing (21) by means of at least one fixing screw (232), and at least one second hinge member (3a, 3b) having a housing (31) in which a hinge pin (22) is rotatably mounted. In order to ensure an easy, quick, and safe installation and removal of the sash using the fewest possible distinct components, a transverse adjustment screw (212), perpendicular to the longitudinal axis (A), is disposed in a recess (231) of the mounting housing (23) of the first hinge member (2) and is threaded into a positioning protrusion (211) of the hinge housing (21), the hinge pin (22) is rotatably mounted in a through-bushing (32) of the second hinge member (3a, 3b) and rests on a longitudinal adjustment screw (33) threaded into the housing (31) of the second hinge member (3a), and a polymer sliding cap (222) is disposed between the front surface of the hinge pin (22) and said longitudinal adjustment screw (33).