Door Closer Intermediate Part Segments Force Paths
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Solution Overview
Problem
Existing door closers experience significant wear and sluggishness due to the high stress on components, particularly the closer shaft and cam disc, as they transmit both closing force and damping forces, leading to inefficient door closure movements.
Innovation Solution
The introduction of an intermediate part between the drive piston and the damping piston allows the damping piston to receive the closing force directly, bypassing the closer shaft and cam disc, thereby reducing wear on door closer components and ensuring a smooth closing movement by facilitating power transmission between the drive and damping pistons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the closer shaft and cam disc transmit both closing force and damping forces, then the door closer can perform both closing and damping functions, but the components experience significant wear and become sluggish
Solution Approach 1:
The force transmission path is segmented into two separate paths: one for closing force (through the cam disc and closer shaft) and one for damping force (through the intermediate part and damping piston). This segmentation allows each component to handle only its designated force type, reducing overall wear and improving reliability while maintaining both closing and damping functionalities.
2Adaptability or versatility
If the closer shaft transmits both closing force and damping forces, then the door closer can perform both functions, but the closing movement becomes sluggish
Solution Approach 1:
By segmenting the force transmission paths, the closing force can act directly on the cam disc without being burdened by damping forces. This separation eliminates the sluggishness in closing movement while preserving the damping function through the intermediate part and damping piston.
3Manufacturing precision
If the drive piston is supported on the cam disc without backlash, then the door closer ensures precise force transmission, but the closer shaft and cam disc experience high stress
Solution Approach 1:
The stress is segmented by introducing an intermediate part that carries the damping force separately. This allows the cam disc and closer shaft to maintain precise backlash-free contact for closing force transmission while the intermediate part absorbs the additional stress from damping forces, reducing overall stress on the shaft and cam disc.
Solution Approach 2:
The intermediate part acts as a mediator between the drive piston and damping piston, providing a separate force transmission path for damping forces. This intermediary structure protects the closer shaft and cam disc from excessive stress while maintaining their precise backlash-free contact for closing operations.
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
This design significantly reduces wear on door closer components and enhances the smoothness of the door closure movement, making the door closer suitable for free-swing applications with reduced user effort required for closing the door.
Implementation Method 1
a closing spring (10) arranged in the door closer housing (2) on the side of the drive piston (8) furthest from the closer shaft (3), which acts on the drive piston (8) with a closing force (10F) in the direction of the closer shaft (3)
Implementation Method 2
a cylinder chamber (17) arranged in the door closer housing (2) on the side of the damping piston (9) furthest from the closer shaft (3), which is filled with a hydraulic damping medium, wherein the damping piston (9) can be driven by a damping piston closing movement against the effect of a counterforce delaying the drive piston closing movement
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A door closer (1) comprises a door closer housing (2) with a housing axis (7), a closer shaft (3) rotatably mounted about a shaft axis (4) with a cam disc (5), a drive piston (8) acted upon by a closing force generator (10), and a damping piston (9). The drive piston (8), acted upon by the closing force generator (10), is movable along the housing axis (7) with a drive piston closing movement directed towards the shaft axis (4) of the closer shaft (3) and is supported by the cam disc (5) of the closer shaft (3). Due to the drive piston closing movement, the damping piston (9) is driven against the effect of a counterforce that delays the drive piston closing movement with a damping piston closing movement.An intermediate part (18) extending along the housing axis (7) on the closing shaft (3) is provided between the drive piston (8) and the damping piston (9), by means of which the drive piston (8) is supported on the damping piston (9) in the direction of movement during the drive piston closing movement and thereby drives the damping piston (9) with the damping piston closing movement.