Upright Piano - Action Diagram and Nomenclature

The Inner Workings of One Note
in an Upright Piano

1. String
2. Damper felt
3. Damper head
4. Damper block
5. Hammer
6. Damper wire
7. Damper spring rail felt
8. Damper spring rail
9. Hammer shank
10. Hammer rail cloth

11. Hammer rail
12. Damper lever
13. Damper spring
14. Hammer butt spring
15. Damper flange
16. Hammer butt felt
17. Hammer butt buckskin
18. Hammer butt
19. Catcher shank
20. Catcher

21. Catcher buckskin
22. Backcheck felt
23. Backcheck
24. Damper lift rod
25. Hammer butt flange
26. Main action rail
27. Jack
28. Let-off regulating screw
29. Let-off rail
30. Let-off button

31. Bridle strap
32. Let-off button punching
33. Backcheck wire
34. Damper spoon
35. Jack flange
36. Bridle wire
37. Jack spring
38. Wippen flange
39. Wippen
40. Sustain pedal rod

41. Sticker rail
42. Sticker
43. Sticker flange
44. Sticker tongue
45. Sticker cloth
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

Click here to see the action in motion