Door Lock Control Device with Epicyclic Transmission
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Solution Overview
Problem
Conventional door locking mechanisms require a complete turn of the manual actuation button, which is cumbersome and difficult for weakened or disabled individuals, and poses a risk of incomplete actuation and mechanical damage.
Innovation Solution
A control device with a manual actuation button that can be rotated between 0° to 180°, utilizing an epicyclic transmission device to drive the locking mechanism through one or two revolutions, reducing the risk of overtravel and jamming, and enhancing user comfort and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete turn of the manual actuation button is required to operate the locking mechanism, then the locking mechanism can be fully locked or unlocked, but the operation becomes cumbersome and difficult for weakened or disabled individuals
Solution Approach 1:
The button's rotation range is segmented into a limited 0° to 180° stroke, divided into two extreme angular positions corresponding to locked and unlocked states. This segmentation allows the button to be operated within a comfortable angular range while still achieving complete locking/unlocking through the transmission device's mechanical advantage
Solution Approach 2:
The epicyclic transmission device acts as an intermediary between the manual actuation button and the control shaft. It converts the button's limited 180° rotation into one or two complete revolutions of the control shaft, enabling the button to operate within a comfortable range while still driving the locking mechanism through its full cycle
2Ease of operation
If the button stroke is reduced to less than or equal to 180°, then ease of operation is improved for disabled individuals, but the transmission device must multiply the rotation to achieve full locking mechanism operation
Solution Approach 1:
The epicyclic transmission device changes the rotational parameter by providing a multiplication effect. The button's limited rotation angle (≤180°) is transformed into one or two complete revolutions of the control shaft through the gear ratio of the planetary gear train, allowing reduced button stroke while maintaining full operational range of the locking mechanism
Solution Approach 2:
The planetary gear train serves as a compact intermediary mechanism that bridges the gap between the button's reduced stroke and the control shaft's required rotation. Its epicyclic configuration provides efficient torque multiplication and rotation conversion within a small volume compatible with door knob dimensions
3Reliability
If multiple successive movements are required to turn the button completely, then the full rotation can be achieved, but the risk of incomplete actuation and mechanical damage increases
Solution Approach 1:
The transmission device is configured to automatically complete the full rotation of the control shaft within a single button stroke (≤180°). The mechanical advantage of the epicyclic gear train ensures that one continuous button movement is sufficient to drive the locking mechanism through its complete cycle, eliminating the need for multiple successive movements and reducing the risk of incomplete actuation
Solution Approach 2:
The button is designed to perform a partial rotation (≤180°) that is sufficient when combined with the transmission device's multiplication effect. This partial action, amplified by the gear ratio, achieves the equivalent of a complete or double complete turn of the control shaft, ensuring full locking/unlocking without requiring the button to rotate through a potentially harmful excessive range
4Ease of operation
If the button can be manipulated within a limited angular range, then comfort of use is improved, but the transmission device must be compact to fit within door knob dimensions
Solution Approach 1:
The epicyclic transmission device changes the spatial parameters by providing rotation multiplication within a compact volume. The planetary gear configuration achieves high gear ratios in a small space, allowing the button to operate within a limited angular range (≤180°) while still driving the control shaft through one or two complete revolutions, all within door knob-compatible dimensions
Solution Approach 2:
The planetary gear train employs a nested configuration where planet gears are arranged around a sun gear, with the ring gear enclosing the entire assembly. This nested structure maximizes the gear ratio and torque multiplication within the minimum possible volume, making the transmission device compact enough to be integrated into door knob dimensions while maintaining ease of button manipulation
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 and quick locking or unlocking with reduced wrist movement, minimizing the risk of panic in emergencies and preventing mechanical damage, while ensuring the button's correct operation and reducing the risk of it being left in an intermediate position.
Implementation Method 1
the transmission device comprises an epicyclic train
Implementation Method 2
Such an epicyclic train makes it possible to ensure the desired multiplication in a particularly compact volume
Data Source
Figure 1~2
AI summary
Control device for a door locking mechanism comprising a control shaft (21), suitable for driving an axial rotary input (11) of a locking mechanism (10), a manual actuation button (28), configured to be operable between two extreme angular positions defining a button stroke less than or equal to 180°, and a transmission device (30) coupled between the manual actuation button (28) and the control shaft (21), configured such that actuation of the button (28) from one to the other of its extreme angular positions drives the control shaft (21) by at least one revolution.