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Grand Piano Mechanics
Upright Mechanics
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Upright Piano Action Mechanism Diagram




NUMERICAL KEY

1 String

2 Damper fell

3 Damper head

4 Damper block

5 Hammer

6 Damper wire 1 Spring rail felt a Spring rail

9 Hammer shank

10 Hammer rail dolh

11 Hammer rail

12 Damper lever

13 Damper spring

14 Hammer bun spring

15 Damper flange

16 Hammer butt fell

17 Hammer butt buckskin IB Hammer butt

19 Catcher shank

20 Catcher

21 Catcher buckskin

22 Backcheck felt

23 Backcheck

24 Damper Mil rod

25 Hammer butt flange

26 Main aciion rail

27 jack

28 Letoff regulating screw

29 Letoffrail

30 Letoff buiion

31 Bridle tape

32 Letoff bulton punching

33 Backcheck wire

34 Damper spoon

35 lack flange

36 Bridle wire

37 lack spring

18 Whippen ftange

39 Whippen

40 Sustaining pedal connecting rod

41 Lower action rjil or slicker rail 41 Slicker

43 Sticker flange

44 Slicker tongue

45 Slickerclolh

46 Capstan screw

47 Back rail cloth

48 Key

49 Key lead

50 Balance rail

51 Key button

52 Balance rail key pin

53 Balance rail punching

54 Key frame

55 Front rail

56 Front rail punching

57 Front rail key pin

Upright action
Upright action
ALPHABETICAL KEY

Back rail cloth 47

Backcheck 23

Backcheck tell 22

Backcheck wire 33

Balance rail 50
Balance rail key pin . 52

Balance rail punching S3

Bridle tape 31

Bridle wire 36

Capslan screw 46
Catcher ' 20

Catcher buckskin 21

Catcher shank 19

Damper block 4

Damper fell 2

Damper flange 15

Damper head 3

Damper [ever 12

Damper lift rod 24

Damper spoon 34

Damper spring 13

Damper wire 6

Front rail 55

Front rait key pm 57

Front rail punching 56

Hammer 5


Hammer butt 13
Hammer butt buckskin 17

Hammer butt felt 16

Hammer butt flange 25

Hammer bull spring 14

Hammer rail 11

Hammer rail cloth 10

Hammer shank 9

lack 27

lack flange 35

lack spring 37

Key 48

KeybulTon 51

Kev frame 54

Key lead 49

Letoff buiion 30
Letoff button punching 32

Letoff rail 29
Letoff regulating screw 28

Lower aciion rail ^41

Main action rail 26

Spring rail 8

Spring rail felt 7

Slicker 42

Sticker cloth. 45

Slicker flange 43

Sticker rail 41

Sticker tongue 44

String 1
Su st a i n i n g peda I conneclin g rod 40

Whippen