Door Closer Spring Force Adjustment Mechanism
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Solution Overview
Problem
The existing floor hinge door closer configuration does not allow for external adjustment of spring force without disassembly, leading to potential issues with door opening and closing forces being either excessively large or insufficient based on door size and weight.
Innovation Solution
A door closer design that includes a spring force adjustment mechanism allowing the position of the spring retaining member to be changed externally, using a connecting rod and adjustment shaft to modify the spring force by altering the position of the spring retaining member along the axial direction of the piston, thereby enabling easy adjustment of the return spring force without increasing the size of the main body housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring force is increased to ensure proper door closing, then the door closing reliability is improved, but the door opening force becomes excessively large
Solution Approach 1:
The patent enables adjustment of the spring force parameter through the spring force adjustment mechanism. By changing the position of the spring retaining member along the axial direction of the piston, the spring force can be optimized to match the specific door weight and size, thereby achieving proper door closing reliability without requiring excessively large opening force.
2Ease of operation
If the spring force is decreased to reduce door opening force, then the door opening ease is improved, but the door may not be fully closed
Solution Approach 1:
The spring force adjustment mechanism allows optimization of the spring force parameter to find the appropriate balance between door opening ease and door closing completeness. By adjusting the spring retaining member position, the system can be tuned to provide sufficient closing force to ensure full door closure while maintaining acceptable opening effort.
3Adaptability or versatility
If the spring force is adjusted by disassembly, then the spring force can be modified, but the adjustment complexity increases
Solution Approach 1:
The spring force adjustment mechanism is designed to be operable from the outside of the main body housing without requiring disassembly. The adjustment shaft with its operation section allows users to directly adjust the spring force by rotating the operation section, which transmits movement through the transmission section to reposition the spring retaining member. This self-service design eliminates the need for complex disassembly procedures.
Solution Approach 2:
The adjustment shaft serves as an intermediary mechanism that translates external rotational input into axial movement of the spring retaining member. The operation section on the adjustment shaft receives external input and transmits it through the transmission section (including the tubular connecting rod) to reposition the spring retaining member, providing a simple interface for spring force adjustment without requiring direct access to internal components.
4Adaptability or versatility
If the spring retaining member position is changed, then the spring force is adjusted, but the main body housing size may increase
Solution Approach 1:
The adjustment shaft and transmission section are nested within the existing main body housing structure. The adjustment shaft is inserted through the tubular connecting rod, and the transmission section utilizes the internal space of the connecting rod to transmit movement. This nested arrangement allows spring force adjustment functionality to be integrated into the existing housing volume without significant increase in overall size.
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 easy adjustment of the spring force to match the size and weight of the door, preventing hydraulic oil leakage and ensuring proper door operation by allowing external modification of the spring force without disassembly, thus ensuring optimal door closing and opening forces.
Implementation Method 1
a return spring located on an identical line to the piston and interposed between a spring retaining seat on a fixed side close to the main shaft and a spring retaining seat on a moving side distant from the main shaft, the return spring storing a closing force upon being compressed
Implementation Method 2
an oil chamber filled with hydraulic oil; a piston that partitions the oil chamber into a first oil chamber on a side close to the main shaft and a second oil chamber on a side opposite to the main shaft
Data Source
AI summary
Disclosed is a door closer that can easily adjust the spring force of a return spring. A piston 2 moves toward a first oil chamber 15 upon a door opening operation and moves toward a second oil chamber 16 upon a door closing operation. A return spring 50 is located on the same line as the piston 2. The return spring 50 is interposed between a spring retaining seat on a fixed side close to a main shaft 3 and a spring retaining seat on a moving side distant from the main shaft 3. The return spring 50 is compressed by the spring retaining seat on the moving side moving closer to the spring retaining seat on the fixed side upon the door opening operation and then stores the closing force. The door closer includes a spring force adjustment mechanism configured to change the position of a spring retaining member 40, which has the spring retaining seat on the fixed side, in the axial direction of the piston 2 with respect to the main body housing 1, and configured to adjust the spring force of the return spring 50 by changing the position of the spring retaining member 40 through an operation from the outside of the main body housing 1.