Monolithic Piston Body for Door Closing Device
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Solution Overview
Problem
The high manufacturing effort and costs associated with locking devices for doors and windows due to the regular machining of inserts and subsequent plastic coating.
Innovation Solution
A locking device with a monolithic piston body made from plastic or liquid state materials, simplifying the structure and reducing manufacturing steps, where the damping piston is injection molded and the spring piston is die-cast, allowing for cost-effective production with sufficient stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inserts are machined and coated with plastic, then sufficiently high forces can be transmitted while retaining advantageous friction properties, but the manufacturing effort and costs increase
Solution Approach 1:
The invention merges the insert and piston body into a single monolithic component made of plastic or liquid state material. This eliminates the need for separate insert machining and plastic coating operations, directly resolving the contradiction by maintaining force transmission capability through the unified structure while dramatically reducing manufacturing complexity and costs.
Solution Approach 2:
The invention uses plastic or liquid state materials to create a monolithic piston body that replaces the traditional composite structure of metal insert plus plastic coating. This single material approach achieves the necessary mechanical properties and friction characteristics without requiring multiple materials and complex assembly processes.
2Reliability
If inserts are machined and coated with plastic, then the locking device can function properly, but the manufacturing costs increase
Solution Approach 1:
The invention combines the insert and piston body into one monolithic component, eliminating multiple manufacturing steps (machining, coating, assembly) while maintaining all necessary functional properties. This directly reduces manufacturing costs while preserving the reliability required for proper locking device operation.
3Device complexity
If the piston body is made monolithic from plastic or liquid state material, then the structure is simplified and manufacturing costs are reduced, but the force transmission capability must be maintained
Solution Approach 1:
The invention changes the material parameters by using plastic or liquid state materials with appropriate mechanical properties to create a monolithic piston body. This allows the structure to be simplified without compromising force transmission capability, as the material properties are selected to meet the strength requirements while enabling simpler manufacturing.
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 approach significantly reduces manufacturing complexity and costs while maintaining stability and functionality, enabling a cost-effective design for door and window closing devices.
Implementation Method 1
a spring piston (16) acted upon by a spring (14) for applying a closing force to a closer shaft (18)
Implementation Method 2
a damping piston (22) for damping the movement of the closer shaft (18)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a closing device (10) for closing a door or window leaf, comprising a spring piston (16) which is acted upon by a spring (14) for applying a closing force to a closing shaft (18) and a damping piston (22) for damping the movement of the closing shaft (18). In order to allow a closing device to be provided in an inexpensive manner using simple structural means, the closing device is designed and developed such that the damping piston (22) or the spring piston (16) has a piston body (32, 62) which is produced monolithically and is primary-shaped from the plastic or liquid state.