Swiveling Draft Shield Door for Compact Precision Balances
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Solution Overview
Problem
Existing draft shields for high precision balances face challenges such as increased size due to sliding side doors, difficulty in cleaning guideways, and air agitation during door movement, which affect measurement precision.
Innovation Solution
A draft shield with swiveling doors that swivel perpendicular to their face, minimizing the need for large spaces and reducing air agitation, and incorporating a drive mechanism with tensioned springs for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sliding side doors are used in the draft shield, then the door can be opened for transferring weighing goods, but the draft shield width must be at least as large as the balance housing width, increasing the enclosed volume
Solution Approach 1:
Instead of sliding the door horizontally along the front face of the draft shield, the invention inverts the opening direction by sliding the door along the side walls towards the back of the draft shield. This allows the door to open without increasing the front width of the draft shield, enabling the draft shield to be narrower than the balance housing while still providing access for transferring weighing goods.
Solution Approach 2:
The door opening movement is shifted from the horizontal dimension (front to back along the front face) to the lateral dimension (along the side walls towards the back). This dimensional change allows the door to be opened without increasing the front width requirement, resolving the contradiction between door opening capability and compact draft shield width.
2Reliability
If sliding doors with guideways are used, then the door can be guided during movement, but the guideways are difficult to clean and prone to contamination
Solution Approach 1:
The invention extracts the door from the guideway system entirely. Instead of the door sliding within enclosed guideways, the door slides along the outer side walls of the draft shield and is supported by rollers that run along the top and bottom edges. This eliminates the enclosed guideway structure that is difficult to clean, while still providing reliable door movement guidance through the roller-supported sliding mechanism.
3Ease of operation
If hinged doors are used, then the door can be opened for access, but the door movement perpendicular to its face agitates air inside the draft shield, affecting measurement precision
Solution Approach 1:
Instead of hinging the door to open perpendicular to its face (which agitates air), the invention inverts the opening mechanism to a sliding motion along the side walls. The door moves parallel to its face during opening and closing, maintaining a more stable air environment inside the draft shield and reducing air agitation that could affect measurement precision.
Solution Approach 2:
The hinged mechanical system (which causes air agitation) is replaced with a sliding mechanical system guided by rollers along the side walls. This substitution changes the door's movement characteristics from perpendicular face motion to parallel face motion, reducing air disturbance inside the draft shield while maintaining ease of operation.
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 swiveling doors allow for a compact design and improved measurement precision by minimizing air agitation and simplifying cleaning, while maintaining a small enclosed volume.
Implementation Method 1
a bearing assembly with a coil spring drive mechanism
Implementation Method 2
rotation brake to minimize space requirements and reduce air agitation
Data Source
AI summary
A draft shield for a balance is disclosed. The draft shield includes a first wall, a second wall, and at least a first door. The first wall and the second wall adjoin each other perpendicularly and the first door is provided perpendicular to each of the first wall and the second wall. The first door is arranged and configured to swivel between a closed position and an open position. When in the closed position, the first door adjoins a first edge of the first wall and a first edge of the second wall. A swivel axis of the first door extends perpendicular to a face of the first door such that the first door is configured to swivel in the plane of the first door.