Decelerating Device with Segmented Piston and Rod Springs
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Solution Overview
Problem
Existing decelerating devices for moving parts of cabinets are complex and costly due to the need for unidirectional valves and multiple springs, which complicate production and hinder smooth and silent operation, especially in bidirectional movements.
Innovation Solution
A decelerating device with a separate piston and piston rod, each actuated by independent elastic means, allowing for calibrated force control for fast return and slow movement, using viscous fluid for braking and a second spring for volume regulation, eliminating the need for unidirectional valves and simplifying production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If unidirectional valves are adopted on the piston to enable fast return and slow braking movement, then the bidirectional movement control is improved, but the device complexity and production cost increase
Solution Approach 1:
The device is segmented into two independent subsystems: a piston with first elastic means for controlled return movement, and a rod with second elastic means for fast return movement. This segmentation eliminates the need for unidirectional valves on a single piston, simplifying the overall device structure while maintaining bidirectional movement control capabilities
Solution Approach 2:
Two separate elastic means (springs) are introduced as intermediary elements to independently control the piston and rod movements. The first elastic means mediates the piston's controlled return, while the second elastic means mediates the rod's fast return, replacing the complex valve mechanism with simpler elastic force mediation
2Manufacturing precision
If multiple springs are used to actuate piston and rod separately, then the movement control precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The single-piston-spring design is segmented into two independent piston-rod assemblies, each with its own elastic means. This allows independent calibration of each spring for optimal performance while using standardized components that can be manufactured separately and assembled, actually simplifying the manufacturing process
Solution Approach 2:
The elastic characteristics of the two springs can be independently adjusted by changing parameters such as spring constant, coil diameter, and number of active coils. This allows precise control of movement characteristics while using standard spring manufacturing processes, maintaining ease of manufacture while achieving high precision
3Device complexity
If a single spring acts on both piston and rod, then the device simplicity is maintained, but the independent movement control is lost
Solution Approach 1:
The single spring system is segmented into two independent elastic means, each dedicated to controlling either the piston or the rod. This segmentation enables independent movement control while maintaining relative device simplicity through modular design and clear functional separation
Solution Approach 2:
The rod serves multiple functions: it acts as a pusher during the braking stroke and as an extractor during the return stroke. The separate elastic means on the rod enables it to independently perform these dual functions without being coupled to the piston's movement, providing versatility while maintaining simplicity
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 smooth, silent, and economical operation by allowing independent calibration of reset springs for fast return and slow movement, improving the deceleration and pushing functions, and facilitating easy production.
Implementation Method 1
the speed of the viscous fluid, which flows in the calibrated passage of the piston, is the element that determines the braking action
Implementation Method 2
each of them is actuated separately by their respective elastic means, for example a reset spring, which pushes them in their direction of extraction from the cylinder
Data Source
Figure 1
Figure 2~4
AI summary
A decelerating device (1) comprises a cylinder (2) filled with a fluid, a bushing (3) for the closure of the cylinder (2) traversed by a rod (4) sliding in the cylinder (2), and a piston (5) guided to slide inside the cylinder (2) and fitted with means (7) for the calibrated through passage of the fluid, the piston (5) is separate from the rod (4) and there are also first elastic means (8) for the movement of the piston (5) in the direction of extraction from the cylinder (2) and second elastic means (9) independent of the first elastic means (8} for the movement of the rod (4) in the direction of extraction from the cylinder (2).