Upright Keyboard Instrument Pedal Rod Forward Arrangement
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Solution Overview
Problem
Conventional upright electronic pianos require increased depth due to the placement of the damper pedal rod behind the damper levers, which limits their compactness.
Innovation Solution
The upright keyboard instrument design positions the pedal rod forward of the damper levers and incorporates a damper lever drive mechanism that allows the damper rod to pivot rearward, eliminating the need for additional space behind the levers, thus reducing the overall depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pedal rod is disposed rearward of the damper levers to push up the rod lever, then the damper lever operation is achieved, but the depth dimension of the keyboard instrument is increased
Solution Approach 1:
The patent inverts the conventional arrangement by positioning the pedal rod forward of the damper levers instead of rearward. The pedal rod pushes forward on the damper rod, which then pivots to press the damper levers rearward, achieving the same operational effect while reducing depth dimension.
Solution Approach 2:
The patent changes the spatial arrangement from a rearward push configuration to a forward push configuration with pivoting action. The damper rod acts as a pivot point, converting the forward linear motion of the pedal rod into rearward motion of the damper levers, effectively utilizing rotational movement to solve the space constraint.
2Length of stationary object
If the pedal rod is disposed forward of the damper levers, then the depth dimension is reduced, but the mechanism complexity increases due to the damper lever drive mechanism
Solution Approach 1:
The patent introduces dynamic pivoting motion to the damper rod, which rotates about a pivot point during operation. This dynamic mechanism allows the simple forward push of the pedal rod to be transformed into the required rearward pressing motion of the damper levers, achieving compact design with acceptable mechanical complexity.
Solution Approach 2:
The damper rod serves as an intermediary element between the pedal rod and the damper levers. It receives the forward push from the pedal rod and transmits the motion as rearward pressure on the damper levers through pivoting, acting as a mechanical mediator that simplifies the overall force transmission path.
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 configuration enables the same operational functionality as traditional upright pianos while reducing the depth dimension, making the instrument more compact.
Implementation Method 1
a damper rod which extends in the left-right direction and is supported in a manner movable in a front-rear direction in a state brought into contact with lower portions of the respective damper levers from a front side
Implementation Method 2
a pedal rod which extends in the vertical direction and is disposed forward of the damper levers, the pedal rod being configured to be moved upward by depression of a pedal
Implementation Method 3
a damper lever drive mechanism which is provided between a longitudinal end of the damper rod and an upper end of the pedal rod and is configured to drive the lower portions of the respective damper levers such that the lower portions of the respective damper levers are pressed rearward by moving the damper rod rearward
Data Source
AI summary
An upright keyboard instrument reduced in depth dimension and compact as a whole. Damper levers each extend in a vertical direction and are pivotally movably supported at or in the vicinity of a longitudinal center thereof, in a side-by-side arrangement in a left-right direction at a location rearward of actions. A damper rod extends in a left-right direction. A pedal rod extends in the vertical direction and is disposed forward of the damper levers, so as to be moved upward by depression of a pedal. A damper lever drive mechanism is provided between a longitudinal end of the damper rod and an upper end of the pedal rod and drives lower portions of the damper levers such that the lower portions are pressed rearward by moving the damper rod rearward in accordance with upward movement of the pedal rod.