Conical Spring Percussion Tool Vibration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid-powered percussion tools face challenges with overload resistance and vibration-induced injuries due to inadequate design of the elastically resilient element and pressurized fluid connection, particularly in handling extreme loads and maintaining low vibration levels.
Innovation Solution
The introduction of a conical helical spring as the elastically resilient element and a flexible PVC plastic hose with polyester reinforcement for the pressurized fluid connection, which provides enhanced compression ability, radial stiffness, and reduced vibration, allowing for secure radial fixation and improved operational stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a straight helical spring is used as the elastically resilient element, then the spring can provide axial rigidity, but it cannot allow extreme compression due to closed-up spring turns
Solution Approach 1:
The patent applies a conical spring geometry instead of a straight cylindrical spring. The conical shape with varying diameter along the axis allows the spring to accommodate extreme compression while maintaining structural integrity. The larger base diameter provides stability and the tapered form allows gradual coil closure without binding
Solution Approach 2:
The spring parameters are optimized with a specific cone angle (15-45 degrees), wire diameter (5-20% of base diameter), and pitch ratio to balance axial rigidity with compression capability. The geometric parameters are carefully selected to ensure the spring can deflect up to 80% of its free length while maintaining sufficient stiffness
2Stability of the object's composition
If a nonflexible connection for pressurised fluid is used, then the percussion tool can move in linear fashion, but the connection cannot handle extreme overloads
Solution Approach 1:
The patent employs a flexible hose with polyester reinforcement instead of a rigid pipe for pressurised fluid delivery. The hose maintains sufficient structural integrity to guide fluid flow while its flexibility allows it to accommodate the percussion tool's movement and absorb extreme overloads without breaking
Solution Approach 2:
The fluid connection uses a composite structure combining flexible PVC plastic with polyester reinforcement layers. This composite construction provides both the flexibility needed for movement and the strength required to handle extreme pressure overloads
3Device complexity
If a rubber membrane is used as the elastically resilient element, then the connection can be integrated, but the element has unacceptable lifetime when exposed to extreme overloads
Solution Approach 1:
The patent extracts the pressurised fluid connection from the elastically resilient element, separating these two functions. The conical spring provides purely mechanical resilience while the flexible hose handles fluid delivery, allowing each component to be optimized for its specific function and both to withstand extreme overloads
4Strength
If the spring turns are closed up during compression, then the spring can provide rigidity, but the possible compression is limited
Solution Approach 1:
The conical geometry with its tapered form prevents spring turns from closing up completely during compression. The varying diameter creates a progressive coil closure pattern that maintains gaps between adjacent turns even under extreme compression, enabling deflection up to 80% of free length while maintaining rigidity
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
The solution significantly increases the tool's resistance to overloads and extends its lifespan while minimizing operator exposure to vibrations, ensuring effective operation with reduced risk of injury and improved performance in demolition tasks.
Implementation Method 1
an elastically resilient element with an integrated line for pressurised fluid arranged to load the percussion mechanism against a neutral position in the tool housing
Implementation Method 2
a flexible connection for pressurised fluid... arranged to load the percussion mechanism against a neutral position
Data Source
Figure 1
Figure 2
AI summary
Fluid-powered percussion tool 1, comprising a housing 2 with a supply channel for pressurised fluid 3, a percussion mechanism 4, a swinging joint 5 arranged to carry the percussion mechanism 4 relative to the housing 2 at a point situated between the forward end A and the rear end B of the percussion mechanism 4, at least one elastically resilient element 6 arranged between the housing 2 and the percussion mechanism 4 at a distance from the swinging joint 5 and arranged to load the percussion mechanism 4 against a neutral position in the housing 2 and to absorb the vibrational movements of the percussion mechanism 4, and a flexible connection for pressurised fluid 7 for distribution of pressurised fluid from the supply channel for pressurised fluid 3 to the percussion mechanism 4. The elastically resilient element 6 comprises a conical spring 8. The flexible connection for pressurised fluid 7 comprises a hose 11.