Underfloor Device Box Height Adjustment Mechanism
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Solution Overview
Problem
Conventional underfloor device boxes require tedious and time-consuming height adjustments, especially when large differences in height need to be overcome, and the process of decoupling the housing parts after screed hardening is cumbersome, risking cracks due to rigid connections.
Innovation Solution
The underfloor device box features a lower and upper housing part connected by threaded rods with a radially displaceable engagement part having an internal thread, allowing for quick height adjustments via linear displacement and fine adjustments through rotary movement, along with a decoupling mechanism using a pin and chamfers to prevent screed cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If height adjustment is performed by rotating threaded rods at all four corners, then the underfloor device box can be adjusted to the planned screed level, but the adjustment process becomes time-consuming and tedious
Solution Approach 1:
The height adjustment mechanism is segmented into two independent systems: a quick adjustment mechanism using a movable clamping shoe that can be rapidly positioned along the threaded rod, and a fine adjustment mechanism using the threaded rod rotation. This segmentation allows the majority of height adjustment to be performed quickly by the clamping shoe, reserving the time-consuming threaded rod rotation only for precise final positioning.
Solution Approach 2:
The clamping shoe is pre-equipped with a clamping mechanism that can be quickly activated to grip the threaded rod at any position. This preliminary preparation of the clamping shoe allows for rapid height adjustment without requiring manual threading or complex operations, significantly reducing the overall adjustment time.
2Stability of the object's composition
If the upper housing part is rigidly connected to the lower housing part through threaded rods, then structural stability is maintained, but thermal expansion and moisture fluctuations of the screed cause cracking
Solution Approach 1:
The connection between the upper and lower housing parts is made dynamic rather than static. The clamping shoe can be decoupled from the threaded rod after height adjustment, transforming the rigid connection into a movable one. This allows the housing to adapt to screed movements caused by thermal expansion and moisture fluctuations, preventing cracks while maintaining structural integrity.
Solution Approach 2:
The connection state parameter is changed from fixed (clamped) to movable (decoupled) after the height adjustment is complete. This parameter change allows the system to transition from a rigid structure suitable for adjustment to a flexible structure that can accommodate screed movements, eliminating the cracking problem.
3Reliability
If a decoupling mechanism is implemented by removing clamping shoes, then the housing can adapt to screed fluctuations, but the decoupling process becomes cumbersome
Solution Approach 1:
The clamping shoe is designed with a self-release mechanism that allows automatic decoupling from the threaded rod. After the screed hardens and the housing needs to be freed from rigid constraints, the clamping shoe can be easily released without requiring complex tools or procedures, making the decoupling process simple and user-friendly.
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
Enables rapid and precise height adjustments and decoupling of the housing parts, facilitating quicker installation and preventing screed cracking during thermal or moisture expansion.
Implementation Method 1
means for adjusting the height of the upper housing part relative to the lower housing part by means of a rotary movement relative to the upper housing part along a thread of the threaded rod
Data Source
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AI summary
The box has a housing lower part (12) fitted on a building base, and a housing upper part supported by thread bars (26) against the lower part. A height adjuster (22a) adjusts height of the upper part relative to the lower part by rotary movement relative to the upper part along a thread pitch of the thread bars. The thread bars are held in a longitudinal guide (34), and an engagement part (30) is radially moved to the thread bars and provided in an area of the guide. The engagement part is provided with an internal thread (56) at an end turned towards the thread bars.