Door Actuating Linkage Cable Routing Offset
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Solution Overview
Problem
Existing door operator linkages face challenges in providing a simple, reliable, and low-maintenance solution for secure cable routing, especially when mounted on a door frame or wall, as they often compromise on stability and cable management due to the need for efficient force transmission and rotational movement.
Innovation Solution
A door operator linkage design featuring a lever and linkage head with an offset that creates a free space for cable routing, where the lever extends over the door leaf, forming a shoulder that allows cable passage, and includes a cable duct system for secure and stable routing, capable of rotational movement up to 180° with optimized bending radii and stability at the transition point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the door operator linkage uses a simple design for reliable and low-maintenance operation, then maintenance requirements are reduced, but cable routing security may be compromised
Solution Approach 1:
The patent combines the cable routing function with the structural components of the door operator linkage. The cable guide is integrated into the linkage head, and the cable routing path is formed by the natural geometry of the lever and linkage head assembly. This merging of functions allows secure cable routing without adding separate complex cable management systems, thereby maintaining simplicity and low maintenance requirements while ensuring cable security.
2Stability of the object's composition
If the lever extends over the door leaf to engage behind it, then force transmission stability is improved, but cable routing space may be limited
Solution Approach 1:
The patent utilizes the three-dimensional space created by the offset between the lever's longitudinal axis and the rod head. This offset creates a vertical and lateral clearance zone that would otherwise be unused space. The cable routing path is established within this offset-created clearance, allowing cables to be routed vertically and laterally without interfering with the horizontal extension of the lever over the door leaf. This dimensional utilization resolves the contradiction between stability and cable routing space.
3Stability of the object's composition
If the linkage head is rotationally fixed on the output shaft for stable mounting, then rotational stability is improved, but cable bending radius may be restricted during rotation
Solution Approach 1:
The patent pre-configures the cable routing path within the offset clearance before rotation occurs. The cable is positioned to run through the free space created by the offset, with sufficient clearance anticipated for the full 180° rotation range. This preliminary arrangement ensures that during rotation, the cable maintains an adequate bending radius without requiring dynamic adjustment, thereby preserving both rotational stability and cable flexibility throughout the motion range.
Data Source
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AI summary
The invention relates to a door actuator linkage (1) comprising a lever (2) extending along a longitudinal axis (11) which transitions into a linkage head (3) via a crank (6), wherein the linkage head (3) is designed for rotationally fixed mounting on an output shaft (102) of a door actuator (101), wherein the crank (6) forms a clearance (9) for cable routing, and the clearance (9) is limited by the linkage head (3) and by a crank surface (7) of the lever (2), wherein the lever (2) projects up to an imaginary boundary surface (10) defined perpendicular to the longitudinal axis (11), and wherein the crank surface (7) is partially recessed from this boundary surface (10) to enlarge the clearance (9).