Piano Damper with Convex Attaching Surface for Felt Shape Retention
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Solution Overview
Problem
Conventional piano dampers experience degradation of damper felt shape retention over time, leading to narrowing of the space between protrusions, which disrupts the proper sounding stop operation of strings, especially for three-string configurations.
Innovation Solution
A damper design featuring a damper head with a convex attaching surface and bifurcated damper felt protrusions that resist deformation, ensuring the space between protrusions remains stable, allowing for effective vibration stopping over a long term without increasing manufacturing costs by using existing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flat damper felt attachment is used, then manufacturing is simple, but the space between protrusions narrows over time due to deformation
Solution Approach 1:
The attaching surface of the damper head is formed with a convex shape instead of a flat surface. This curvature causes the damper felt to be deformed in a controlled manner during attachment, creating internal stress that resists narrowing of the space between protrusions. The convex shape is specifically designed to maintain the bifurcated structure of the damper felt over time.
Solution Approach 2:
The invention changes the geometric parameter of the attaching surface from flat to convex. This parameter change fundamentally alters how the damper felt is stressed and deformed during attachment, transforming the felt into a state that actively resists the narrowing deformation that would otherwise occur during use.
2Reliability
If damper felt is allowed to deform naturally, then attachment is easy, but the sounding stop operation becomes unstable over time
Solution Approach 1:
The convex attaching surface creates a specific deformation pattern in the damper felt during attachment. This controlled deformation is built into the manufacturing process, ensuring that the felt maintains its proper shape and spacing throughout the product's lifetime, thereby stabilizing the sounding stop operation.
Solution Approach 2:
The convex shape is pre-formed on the damper head before the damper felt is attached. This preliminary action ensures that when the felt is attached, it is immediately deformed into the correct configuration that resists future narrowing, rather than requiring adjustment or correction during the product's use.
3Reliability
If the space between protrusions is allowed to narrow, then manufacturing is simpler, but the damper cannot properly stop all three strings
Solution Approach 1:
The convex attaching surface prevents the bifurcated shape of the damper felt from deforming into a narrowed configuration. By maintaining the proper spacing between the two protrusions, the damper can simultaneously contact all three strings (left, middle, and right) and effectively stop their vibration when the key is released.
Solution Approach 2:
The convex attaching surface creates different stress distributions in different regions of the damper felt. The deformation is localized in a way that specifically protects the space between the protrusions, ensuring that this critical dimension maintains its proper size while other areas of the felt can flex as needed.
Data Source
AI summary
A damper for a piano, which has a bifurcated damper felt of which a space between two protrusions is difficult to be narrowed. A damper head extends along three strings in a lengthwise direction thereof and is movable in directions in which the damper moves into and out of contact with the three strings. Damper felt is attached to a string-side surface of the damper head such that it extends in a lengthwise direction of the damper head, and includes two protrusions formed to protrude toward the strings in a bifurcated manner such that they can be brought into contact with the three strings in a state inserted into respective spaces therebetween. The damper felt is attached to the damper head such that deformation of the damper felt in which a space between the two protrusions is narrowed is resisted.