Adjustable Corner Hinge Anti-Rotation Lock
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Solution Overview
Problem
Existing corner bearings for windows and doors experience unwanted sash displacement due to unintentional rotation of the threaded pin, which can lead to misalignment and operational issues, and current solutions that increase friction to prevent this often result in unwanted twisting.
Innovation Solution
A form-locking anti-rotation mechanism using a projection and recess with a ramp design on the threaded pin and bearing block, combined with spring preload from the inherent elasticity of the material, ensures the threaded pin is fixed in a specific rotational position, preventing unintentional rotation but allowing deliberate adjustment with increased torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the threaded pin is held stiffly in the bearing block to prevent rotation, then unwanted sash displacement is prevented, but the frictional force required to rotate the threaded pin increases excessively
Solution Approach 1:
The patent changes the friction parameter by introducing a lubricated surface at the bearing block-threaded pin interface. The lubrication reduces the coefficient of friction, allowing the threaded pin to rotate more easily for adjustment while still maintaining positional stability when not being adjusted. This resolves the contradiction by decoupling the stiffness needed for stability from the friction that hinders adjustment.
2Reliability
If a form-locking anti-rotation mechanism with projection and recess is used, then the threaded pin is fixed in rotational position preventing unwanted displacement, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating a form-locking connection only at the specific location where the projection on the threaded pin engages with the recess in the bearing block. This localized anti-rotation feature is implemented only where needed, rather than requiring a complex mechanism throughout the entire assembly. The simple geometric interlocking at this specific point provides reliable rotational fixation while minimizing overall device complexity.
3Ease of operation
If increased torque application is required to overcome the form-lock, then deliberate adjustment is enabled, but the ease of operation decreases
Solution Approach 1:
The patent employs dynamics by making the anti-rotation mechanism temporarily disengageable under sufficient torque. The form-locking connection is designed to be overcome when a threshold torque is applied, allowing the threaded pin to rotate freely for adjustment. Once the adjustment is complete and torque is released, the projection automatically re-engages with the recess to maintain the new position. This dynamic behavior enables easy deliberate adjustment while preventing unwanted rotation during normal operation.
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 solution effectively prevents unwanted sash displacement by maintaining the axial position of the hinge pin relative to the bearing block, allowing for precise adjustment only with deliberate torque application, thus ensuring smooth operation and maintaining alignment during sash movement.
Implementation Method 1
The spring preload is generated by the inherent elasticity of the material of the bearing block. In this respect, it is conceivable that areas of the bearing block give way due to their own elasticity when pressure is exerted by the projection.
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The invention relates to an adjustable corner hinge (1) for a leaf of a window, a door or the like, comprising a hinge block (10) and a hinge pin (5) for supporting the leaf, said hinge pin being adjustably fastened to the hinge block (10) by means of a grub screw (15), the grub screw, which can be rotated for the purpose of adjustment, being screwed into a threaded bore (19) of the hinge pin (5). A form-locking rotational lock (39) fixes the grub screw (15) on the hinge block (10) in at least one defined rotational position and can only be released when applying more torque.