Garage Door Installation with Adjustable Tension Spring Preload
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Solution Overview
Problem
The installation of garage doors with tension spring weight compensation units is labor-intensive and requires significant manual effort to lift the heavy door leaf into the open position, often necessitating multiple operators due to the need to apply a force equal to the door's weight.
Innovation Solution
A method where the factory-preloaded tension spring is initially mounted with a preload force less than the door's weight, allowing the door to be easily moved into the closed position and then manually lifted into the open position with reduced effort, with the preload force adjusted to balance the door's weight during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tension spring is pre-loaded with a force equal to the door weight during installation, then the door becomes balanced for operation, but the operator cannot manually move the door into the open position without excessive force
Solution Approach 1:
The tension spring is pre-assembled on the profile with an initial pre-tension force that is deliberately set lower than the door weight during installation. This preliminary configuration allows the door to be easily moved into position. After the door is installed and positioned, the pre-tension force is then adjusted to the final value equal to the door weight, achieving proper balancing for operation.
Solution Approach 2:
The pre-tension force of the tension spring is made dynamically adjustable during the installation process. It starts at a lower value to facilitate manual door movement and positioning, then is increased to the final value equal to the door weight for operational balancing. This dynamic adjustment resolves the contradiction between ease of installation and proper door balancing.
2Ease of manufacture
If the door leaf is pushed into the open position against full weight, then the tension spring can be properly installed and pre-tensioned, but multiple operators are required exerting significant force
Solution Approach 1:
The tension spring is pre-assembled on the profile structure before the door leaf is installed. The initial pre-tension is set to a value lower than the door weight, which allows the door to be easily positioned without requiring multiple operators. This preliminary setup eliminates the need to push the heavy door against full weight during installation.
Solution Approach 2:
The pre-tension force is dynamically adjusted during installation: initially set lower to enable easy door positioning by a single operator, then increased to the final value equal to the door weight once the door is properly installed. This dynamic adjustment reduces installation labor and time while ensuring proper door balancing.
3Reliability
If the pre-tension force is set equal to the door weight from the beginning, then the door is balanced for operation, but the door cannot be easily moved into the closed position during installation
Solution Approach 1:
The tension spring is initially assembled with a pre-tension force that is deliberately set lower than the door weight. This preliminary configuration allows the door to be easily moved into the closed position during installation. After the door is positioned, the pre-tension force is then adjusted to equal the door weight, achieving proper operational balancing.
Solution Approach 2:
The pre-tension force is made dynamically adjustable: initially set lower than the door weight to facilitate easy positioning during installation, then increased to equal the door weight for operational balancing. This dynamic adjustment resolves the contradiction between ease of positioning and proper door balancing.
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
Simplifies the installation process, allowing a single operator to easily move the door from the closed to the open position with minimal effort, reducing the number of steps and required force, and ensuring the door is balanced for operation.
Implementation Method 1
The pre-tension force generated by the tension spring counteracts the weight of the door leaf, with the pre-tension force and the weight force being at least approximately equal
Implementation Method 2
the pre-tension force generated by the tension spring counteracts the weight of the door leaf
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a garage door (1) with a door leaf (2) movable between an open position and a closed position, with at least one counterweight unit comprising a tension spring (7), wherein the door leaf (2) has several panels (3a - d) pivotally connected and guided between two profiles (4). A receiving unit (12) is provided on one profile (4) and is fixedly connected to it. This receiving unit has several receptacles (13) arranged one behind the other in the longitudinal direction of the profile (4). By fastening one end of the tension spring (7) in different receptacles (13), the tension spring (7) is mounted with different preload forces. A locking element (16) is arranged on the receiving unit (12). During the assembly of panels (3a - d) on the profiles (4), a tensioning element connected to the tension spring (7) and a first panel (3a) is fixed in a locking position of the locking element (16).When the mounted door leaf (2) is moved in the direction of the closing position, the pulling element is automatically released from the locking element (16). The invention further relates to a method for installing a garage door.