EP 0229746 A3 19890308 - RETURN MECHANISM FOR AN UPRIGHT PIANO AND MEANS FOR ITS APPLICATION
Title (en)
RETURN MECHANISM FOR AN UPRIGHT PIANO AND MEANS FOR ITS APPLICATION
Publication
Application
Priority
CH 17586 A 19860117
Abstract (en)
[origin: EP0229746A2] This device for an upright piano has a second escapement jack (14). This jack is fixed to the check (9). It can swing about a pivot (16). At one end (15) it extends towards the hammer shank (3) and in the other direction has an end (21). A trigger stop (22), in the form of a button, is fixed to a bar (23) above the second jack. After the first jack (2) has thrown the hammer towards the string (4), it leaves its point of support beneath the butt, through the action of the set-off button (8) on the escapement lever (7). If after striking the string the hammer falls back faster than the key (1) rises, the first jack does not move back under the butt (11). The shank of the hammer then falls onto the end (15) of the second jack. It is then possible, even if the key is allowed to rise only very slightly, to throw the hammer back again by means of the second jack, even if the first jack has not moved back under the butt. At its end of travel, the end (21) of the second jack, which rises with the check, meets the stop (22), and the end (15) rises sharply and lets the hammer reach the end of its travel under its own momentum. A spring (24) restores the second jack to position as soon as pressure on the key is relaxed. <IMAGE>
IPC 1-7
IPC 8 full level
G10C 3/16 (2006.01)
CPC (source: EP US)
G10C 3/161 (2013.01 - EP US); G10C 3/18 (2013.01 - EP); G10C 9/00 (2013.01 - EP)
Citation (search report)
- [A] DE 123696 C
- [A] DE 51541 C
- [A] US 1599743 A 19260914 - WILSON CARNES JOHN
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0229746 A2 19870722; EP 0229746 A3 19890308; EP 0229746 B1 19930505; AT E89093 T1 19930515; DE 229746 T1 19900906; DE 3785680 D1 19930609; DE 3785680 T2 19931111; ES 2014214 A4 19900701; GR 900300103 T1 19910927
DOCDB simple family (application)
EP 87810035 A 19870119; AT 87810035 T 19870119; DE 3785680 T 19870119; DE 87810035 T 19870119; ES 87810035 T 19870119; GR 900300103 T 19910927