Anti-loose Linking Unit for Door Opener Screw
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Solution Overview
Problem
Existing door openers with electric driving devices face issues with the connecting screw becoming loose over time due to repeated pivotal movements, leading to a failure in actuating the push rod, which affects the door's opening and closing functionality.
Innovation Solution
The door opener incorporates an anti-loose member with a polygonal hole and an anti-loose screw that prevents the connecting screw from rotating independently relative to the transmission member and push rod, ensuring it remains securely engaged and preventing loosening during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the connecting screw is used to couple the transmission member and push rod, then the structure is simple and easy to manufacture, but the screw becomes loose after repeated pivotal movement
Solution Approach 1:
The connecting screw is divided into two functional parts: a screw body for threading connection and a separate head with anti-loose structure. The head includes a polygonal inner hole that receives an anti-loose member, separating the fastening function from the anti-loose function. This segmentation allows the screw to maintain simple threading while adding reliability through the anti-loose mechanism.
Solution Approach 2:
An anti-loose member is introduced as an intermediary component between the connecting screw and the push rod/transmission member assembly. This anti-loose member fits into the polygonal hole of the screw head and prevents rotational loosening. The intermediary element solves the reliability problem without complicating the basic screw coupling structure.
2Device complexity
If the axes of the transmission member and screw are coincident with the pivoting axis, then the structure is compact, but the screw cannot prevent loosening during rotation
Solution Approach 1:
The head of the connecting screw features an asymmetric polygonal inner hole (e.g., hexagonal) instead of a circular hole. This asymmetric geometry prevents the anti-loose member from rotating freely, creating a mechanical interlock that resists loosening. The asymmetric design adds minimal complexity while effectively preventing rotational displacement during the coincident pivoting operation.
Solution Approach 2:
The anti-loose member is pre-installed into the polygonal hole of the screw head before assembly. This preliminary action ensures that the anti-loose mechanism is already in place to prevent loosening from the very first operation, rather than requiring additional corrective measures after loosening occurs.
3Ease of operation
If the connecting screw is allowed to pivot jointly with the transmission member, then the mechanism operates smoothly, but the screw gradually loosens over time
Solution Approach 1:
The anti-loose function is extracted from the basic screw structure and implemented through a separate anti-loose member that fits into the polygonal hole of the screw head. This extraction allows the screw to maintain its pivoting capability for smooth operation while the extracted anti-loose component specifically addresses the loosening problem without interfering with the rotational movement.
Data Source
AI summary
A door opener with an anti-loose linking unit includes a driving device and a linking unit disposed between the driving device and the door. The driving device includes a motor and a first transmission member operatively connected to the motor. The linking unit includes a first push rod connected via a connecting screw to the first transmission member, permitting joint pivotal movement. An anti-loose member is non-rotatably mounted on the first push rod. Ahead of the connecting screw is non-rotatably coupled with the anti-loose member. Thus, the connecting screw cannot rotate relative to the first transmission member and the first push rod, reliably preventing the first push rod from disengaging from the first transmission member.