Compact Door Actuator with Dual-Slider Stabilization
Solution Overview
Problem
Conventional door opening and closing devices face issues with size, as they tend to be upsized when using rack and pinion mechanisms, making them unsuitable for embedding in doors, and the operation of crank arm-connected helical extension springs is unstable, limiting the device's width and aesthetic appeal.
Innovation Solution
The solution involves arranging first and second sliders on either side of the rotational axis of the retractable arm, allowing it to move linearly with rotation, thereby reducing the device's width and stabilizing its operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rack and pinion mechanism is used in the door opening and closing device, then the door can be opened and closed with assistance, but the device becomes upsized and cannot be embedded in the door
Solution Approach 1:
The patent replaces the rack and pinion mechanism with a different mechanical system that achieves the same door opening and closing assistance function while reducing device size. The new mechanism allows the door to be assisted in opening and closing without requiring the bulky rack and pinion components, enabling compact integration into the door structure.
Solution Approach 2:
The patent designs the door opening and closing device to be nested within the door structure, with components arranged in a compact, space-efficient configuration. The mechanism is integrated into the door's existing structure, allowing it to fit within the available space without protruding or requiring additional external mounting space.
2Force
If the helical extension spring is directly connected to the crank arm, then the spring force can be directly applied, but the operation of the crank arm becomes unstable and the spring rotates around its end
Solution Approach 1:
The patent introduces an intermediary component between the helical extension spring and the crank arm that prevents the spring from rotating around its end while still transmitting the spring force effectively. This intermediary element acts as a mediator that stabilizes the crank arm operation by constraining the spring's movement path, eliminating the rotational instability without compromising the force transmission.
3Ease of manufacture
If the door opening and closing device is mounted in an exposed manner on the door, then it can be installed without embedding, but it looks bad and is not aesthetically pleasing
Solution Approach 1:
The patent designs the door opening and closing device to be nested within the door structure, with all components contained within the door's thickness. The mechanism is integrated into the door's existing structure, allowing it to fit within the available space without protruding or requiring additional external mounting space, thus achieving a clean, flush-mounted appearance that is aesthetically pleasing while maintaining relatively simple installation procedures.
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
This configuration enables a compact and stable door opening and closing device that can be embedded in doors while ensuring smooth operation and aesthetic integration.
Implementation Method 1
A force for the catcher member retracting the catch results from a spring force of a helical extension spring
Implementation Method 2
a retractable arm (4) which is supported so as to be rotatable around an arm axis (5)
Implementation Method 3
as the first and second sliders move linearly in one direction with rotation of the retractable arm
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3~4
AI summary
Provided is a door opening and closing device which is small in width and capable of stabilizing the operation of a retractable arm. The door opening and closing device has an arm block 121 of a retractable arm 104 which is provided in a body case 102 elongated in one direction and rotates from an open state to a closed state. At one side of the body case 102, a first slider 134 is provided which moves linearly in one direction in conjunction with rotation of the arm block 121. At an opposite side of the body case 102, a second slider 131 is provided to sandwich an arm axis 105 as a rotational center of the arm block 121 between the first slider 134 and the second slider 131. The second slider 131 moves linearly in the one direction in conjunction with rotation of the arm block 121. At the one side of the body case 102, a biasing member 128 is provided for biasing the first slider 134 in one direction, and at the opposite side of the body case 102, a damper is provided for resisting linear movement of the second slider 131.