Counter-pendulum Bell Drive with Linear Motor
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Solution Overview
Problem
Existing bell ringing systems generate significant lateral thrust forces that can lead to structural vibrations, resonance, and potential destruction of bell towers, while also compromising acoustic performance due to the introduction of mechanical noise and imprecise clapper stops.
Innovation Solution
A compact bell ringing system incorporating a counter-pendulum with a linear motor, where the stator or rotor is mounted on the counter-pendulum, and the bell's axis carries the associated rotor or stator, allowing for direct drive without a reduction gear, with counter-pendulums designed to match the bell's mass distribution and adjustable for precise alignment, eliminating lateral thrust forces and mechanical noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a bell is hung with full mass below its pivot point for optimal acoustic ringing, then ideal acoustic performance is achieved, but considerable lateral thrust forces are generated that can cause structural vibrations and potential tower destruction
Solution Approach 1:
The patent introduces a counter-pendulum with mass equal to the bell's mass that oscillates in opposite phase to the bell. This counter-pendulum generates counterbalancing forces that completely compensate for the lateral thrust forces generated by the bell during oscillation, eliminating the harmful forces from the tower structure while preserving the bell's full mass configuration for optimal acoustic performance
2Reliability
If counter-pendulums are added to compensate for lateral thrust forces, then structural safety is improved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines the counter-pendulum drive mechanism with the bell's existing suspension system by mounting the counter-pendulum on the same pivot axis and integrating the drive mechanism into the existing belfry structure. This merging approach reduces overall system complexity and space requirements compared to separate counter-pendulum systems, while still achieving complete compensation of lateral thrust forces
3Productivity
If traditional mechanical drives are used for bell ringing, then driving function is achieved, but mechanical noise and imprecise clapper stops are introduced
Solution Approach 1:
The patent replaces traditional mechanical drive systems (such as cable wheels, gears, and pulleys) with a linear motor that directly acts on the counter-pendulum. This substitution eliminates mechanical transmission components that generate noise and imprecision, achieving clean electromagnetic actuation that provides precise control of the bell's oscillation without mechanical interference
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 system achieves ideal acoustic ringing with complete compensation of lateral thrust forces, preventing structural damage and noise transmission, while maintaining precise clapper stops and optimal sound quality without introducing supporting moments into the tower structure.
Implementation Method 1
at least one counter-pendulum (16, 17) is equipped with a linear motor (12, 13) as a drive
Implementation Method 2
the linear motor (12, 13) works without power transmission via cables to the bell by being a linear motor Drive torque is transmitted to the bell via a reaction rail
Implementation Method 3
arrangements for canceling the lateral forces of swinging bells by means of counter-oscillation
Implementation Method 4
the counter-pendulum oscillating against the bell, the mass of which is around the center of oscillation should be so crowded together
Implementation Method 5
During the pendulum movement, horizontal and vertical bearing forces are generated, which are transferred to the bell tower via the bell bearing
Implementation Method 6
the bell is hung with full mass, ready for operation, below its pivot point
Implementation Method 7
a clapper, which is suspended in the middle of the bell, strikes the brass knuckles of the bell rib
Implementation Method 8
which ideally leads to a tonal excitation of the bell with a rising, freely swinging bell at full ringing pitch
Data Source
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AI summary
An arrangement equipped with a counterpendulum device for ringing a bell (1) suspended on a bell axis (5) is characterized in that the counterpendulum device comprises at least one counterpendulum (16, 17) which is mounted to swing freely relative to the bell axis (5), and that the at least one counterpendulum (16, 17) is driven by at least one linear motor (12, 13).