In order to avoid in the repeater mechanism pianos the friction between the tongue and the hammer

• 1. 一种加强弹奏断连感的立式钢琴击弦机构 [P] . 中国专利： CN201707886U . 2011.01.12
• 2. 一种电钢琴弹奏机构 [P] . 中国专利： CN202034026U . 2011.11.09
• 3. Hammer mechanism for grand piano, includes pair of magnets for reducing friction between repetition lever and hammer stem [P] . NL1022822C1 . 2004-09-06

  机译： 三角钢琴的锤击机构，包括一对磁铁，用于减少重复杆和锤柄之间的摩擦

• 4. Piano keyboard hammer mechanism repeater lever - has pivotally mounted support carrying setting screw and made of PTFE and fitted with slot for bias spring [P] . 德国专利： DE3017136A1 . 1980-11-27

  机译： 钢琴键盘锤机制中继器杆-具有可枢转安装的支撑架，该支撑架带有定位螺丝，由PTFE制成，并配有用于偏置弹簧的插槽

• 5. HAMMER FOR UPRIGHT PIANO, STRING STRIKING MECHANISM USING THE SAME AND UPRIGHT PIANO LOADED WITH STRING STRIKING MECHANISM [P] . 日本专利： JP2015014661A . 2015-01-22

  机译： 立式钢琴的弦槌，使用相同的弦击机制立式钢琴的弦槌机制

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• 4. Generalized water hammer algorithm for piping systems with unsteady friction. [D] . Suarez, Acuna, Jaime. 2006
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• 6. Labor Reducing Piano Regulating Mechanism Using Precise Voice Coil Motor with No Friction [O] . Boehmer David, Eklem Phil, Venkataraman Vijay, 2010

• 1. Failure Mechanisms and Structural Optimization of Shredder Hammer for Metal Scraps [J] . ZHOU Xianyan ,HU Zhili ,TAO Yijun . 中国机械工程学报 . 2016,第004期
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• 5. 断奏 连奏 跳奏——钢琴基础教学中的三种基本弹奏法 [A] . 庄吟新 . 2008