Door Retaining Mechanism With Threaded Holding Arm
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Solution Overview
Problem
Existing door retaining mechanisms in vehicles fail to control the door's position at desired steps and angles, leading to issues like undesired hitting, jamming, friction, scratches, and noise during opening and closing.
Innovation Solution
A door retaining mechanism featuring a holding arm with rotational freedom, threaded and non-threaded parts, and guide extensions that allow the door to be fixed at any position by engaging the threaded part between the upper and lower hubs, preventing rotation and allowing controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a door retaining mechanism stops the door only at delimited specific angles, then the structure is simple, but the door cannot be fixed at desired positions between steps, causing hitting, jamming, friction, scratches, and noise
Solution Approach 1:
The holding arm is segmented into a threaded part and a non-threaded part. The threaded part engages with the upper and lower hubs to provide continuous position control, while the non-threaded part allows for smooth movement between positions. This segmentation enables the door to be fixed at any desired angle rather than only at delimited steps.
Solution Approach 2:
The holding arm is designed to rotate freely about its own axis, transitioning between different functional states. When the threaded part engages with the hubs, the door is fixed at a desired position. When the non-threaded part is between the hubs, the door can move smoothly. This dynamic behavior allows the mechanism to adapt between continuous control and free movement.
2Ease of operation
If the holding arm rotates freely in its own axis, then the door can be easily moved when the non-threaded part is between hubs, but the door cannot stay fixed at desired positions
Solution Approach 1:
The holding arm's ability to rotate freely about its own axis is combined with the threaded engagement mechanism. The free rotation enables easy movement when the non-threaded part is between hubs, while the threaded part's engagement with the upper and lower hubs provides stability and fixes the door at desired positions. This dynamic system switches between mobility and stability based on the holding arm's rotational position.
3Stability of the object's composition
If threads are provided on the surfaces of the upper and lower hubs pressing the holding arm, then the door stays fixed at any position, but friction and noise increase during movement
Solution Approach 1:
The holding arm is divided into threaded and non-threaded parts to separate the functions of fixation and movement. The threaded part engages with the hubs to provide stable position fixation with minimal friction, while the non-threaded part facilitates smooth movement between positions, reducing noise and harmful friction during transitions.
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 mechanism ensures the door stays fixed at desired positions, reducing friction and noise, and allows for controlled opening and closing, addressing the limitations of existing systems.
Implementation Method 1
at least one thread is provided on the surfaces of the lower hub and the upper hub pressing the holding arm in a compliant manner to the threaded part
Implementation Method 2
a check spring for biasing the movable shoe in the direction of engagement with the pinion. The door is held at an arbitrary opening degree by an engaging force of the movable shoe with the pinion due to a biasing force of the check spring
Implementation Method 3
improvements in door checks and has for its object to provide a simple, practical and effective device for checking a door in its closing -movement without the -use of air- or liquid for a checking medium
Data Source
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AI summary
The present invention relates to a door retaining mechanism (1) having a holding arm (90), an upper hub (70a) and a lower hub (70b) provided in a manner tightening the holding arm (90) in between and which controls opening of the door in vehicles. As an improvement, the holding arm (90), provided at least partially in cylindrical form, is configured to have rotational freedom in its own axis, the holding arm (90) comprises at least one threaded part (92) which extends partially thereon and a non-threaded part (93) which extends at the continuation of the threaded part (92), and at least one thread (74) is provided on the surfaces of the lower hub (70b) and the upper hub (70a) pressing the holding arm (90) in a compliant manner to the threaded part (92).