Compact Handle With Nested Gear Multiplier
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Solution Overview
Problem
Existing casement handles with gear multipliers are bulky, aesthetically unappealing, and have an inconvenient user experience due to a decentralized operating pin position, leading to uncomfortable operation and ineffective closure mechanisms.
Innovation Solution
A compact handle design with a gear multiplier mechanism where the axis of rotation of the operating pin is aligned with the handle's axis, allowing for a reduced volume and comfortable user experience, utilizing a multiplier gear mechanism that transmits motion from a 15°-30° handle rotation to achieve a 90° pin movement, with a centralized pin position for standard operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gear multiplier mechanism is used to reduce handle rotation angle to 15°-30°, then the handle rotation angle is reduced, but the device volume increases due to bulky mechanism
Solution Approach 1:
The patent implements nesting by placing the gear multiplier mechanism inside the handle body cavity. The gear mechanism components (gear, pinion, shafts) are arranged concentrically and nested within the handle's internal space, allowing the mechanism to occupy minimal volume while maintaining full functionality. This resolves the contradiction by achieving the required motion multiplication without increasing external handle dimensions.
Solution Approach 2:
The patent transitions from a decentralized pin arrangement to a centralized pin arrangement aligned with the handle rotation axis. This dimensional reorganization allows the gear mechanism to be compactly arranged around the central axis rather than extending outward, reducing the mechanism's radial footprint and overall handle volume while maintaining the 15°-30° rotation angle benefit.
2Ease of operation
If the operating pin is positioned centrally on the handle axis, then the user experience is improved, but the device complexity increases due to alignment requirements
Solution Approach 1:
The patent employs asymmetric gear tooth profiles and non-uniform pitch distributions on the gear and pinion. This asymmetric design allows the centralized pin arrangement to achieve proper motion transmission without requiring complex precision alignment mechanisms. The asymmetric geometry inherently guides the components into correct relative positions during assembly, reducing the actual complexity despite the centralized configuration.
3Volume of moving object
If the gear multiplier transmits movement to a centralized pin, then the handle volume is reduced, but rotation reversal occurs affecting closure effectiveness
Solution Approach 1:
The patent inverts the traditional gear engagement arrangement by positioning the pinion on the handle shaft and having it drive the gear on the pin shaft, rather than the conventional configuration. This inverted arrangement, combined with the centralized pin position, eliminates the rotation reversal problem while maintaining the compact volume. The inversion changes the direction of force transmission so that handle rotation directly translates to pin movement without reversal.
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 provides a comfortable and effective user experience by aligning the operating pin with the handle's axis, resulting in a compact and aesthetically pleasing handle that maintains the standard operation feel while ensuring efficient casement closure.
Implementation Method 1
multiplier mechanisms are used, which make it possible to obtain a complete movement of the pin in case of a rotation of the handle by only 15° - 30°. The complete movement of the pin is obtained with a rotation of the operating pin by 90°, hence the need for the multiplier gear mechanism.
Data Source
Figure 1~4b
Figure 2
Figure 3
AI summary
This invention relates to a handle for sliding doors and windows and, more precisely, a handle with its own rotation between 15°-30°, i.e. a handle equipped with a gear multiplier.