Cable Drum Inclined Axis Ground Clearance
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Solution Overview
Problem
Existing cable drums with a horizontal axis of rotation suffer from low ground clearance, increased risk of accidents, poor visibility of socket inserts, water ingress leading to short circuits, and limited bearing lifespan due to uneven weight distribution.
Innovation Solution
The cable drum is designed with an inclined drum axis, typically between 3 to 10°, which increases ground clearance, improves visibility of socket inserts, and shifts the bearing load to reduce wear and enhance drainage, ensuring better weight distribution and reduced risk of tipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drum axis is oriented horizontally parallel to the installation level, then the cable drum structure is simple and compact, but the ground clearance at the front flange is very small causing safety risks
Solution Approach 1:
The patent changes the orientation of the drum axis from horizontal to inclined at an angle of 5-15 degrees relative to the horizontal plane. This dimensional change in orientation increases the ground clearance at the front flange, allowing the rotary handle to be operated without risk of hand injury while maintaining structural simplicity.
2Device complexity
If the drum axis is oriented horizontally, then the cable drum is compact, but raindrops flow into the socket insert causing short circuits
Solution Approach 1:
By inclining the drum axis at 5-15 degrees, the front flange and socket insert are positioned at an elevated angle. This dimensional change creates a natural drainage path that prevents raindrops from flowing directly into the socket insert, eliminating the short circuit risk while maintaining structural compactness.
3Device complexity
If the drum axis is oriented horizontally, then the cable drum is compact, but visibility of socket inserts is poor requiring user to kneel or bend down
Solution Approach 1:
The inclined orientation of the drum axis at 5-15 degrees elevates the socket insert position and changes its angular orientation relative to the user. This dimensional change improves visibility and accessibility of the socket insert, allowing users to operate it in a standing position without kneeling or bending down.
4Device complexity
If the winding drum is mounted on one side at the rear flange, then the cable drum structure is simple, but weight distribution is poor causing tipping risk
Solution Approach 1:
By inclining the drum axis at 5-15 degrees, the weight distribution along the drum is optimized. The inclination creates a more favorable center of gravity position that reduces the tipping moment, improving stability on inclined planes while maintaining the simple one-sided rear flange mounting structure.
5Device complexity
If the drum axis is oriented horizontally, then the cable drum is compact, but wear on the pivot bearing is high limiting service life
Solution Approach 1:
The inclined orientation of the drum axis at 5-15 degrees changes the load distribution pattern on the pivot bearing. This dimensional change reduces concentrated stress and friction at the bearing contact points, thereby reducing wear and extending the service life of the bearing while maintaining structural simplicity.
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 inclined axis design significantly reduces the risk of injury, improves usability, extends bearing lifespan, and prevents water ingress, providing enhanced safety and operational efficiency.
Implementation Method 1
there is also poor weight distribution. Since in most cases the winding drum is mounted on one side at its rear flange on an associated pivot bearing on a pedestal that only offers support on one side, there is therefore the disadvantage that winding drums with high loads in particular tend to tip over forwards or cannot be set up on inclined planes, because then an unfavorable weight shift in the direction of the front flange of the winding drum and the socket inserts arranged there takes place
Implementation Method 2
raindrops acting on the cable drum from above flow into the socket insert built into the front flange, which can lead to dangerous short circuits
Data Source
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AI summary
Cable drum (1) with a base (2) having one or more support legs (5, 6) and a bearing plate (18) on which a rotary bearing (42, 44, 45) is formed for the support of a winding drum (10), wherein the winding drum (10) is rotatably mounted on a drum axis (42) inclined upwards at an angle (37) to the horizontal (38).