GB469102A - Piano action - Google Patents

Abstract

469,102. Pianofortes. FINHOLM, W. S. Dec. 13, 1935, No. 34660. [Class 88 (ii)] In a repetition action for a pianoforte, the jack 35, Fig. 1, acts on the hammer 22 through a knuckle 39 on the repetition lever 32 which lever is pivoted on the flinge 25 at a point 33 spaced from the pivot 30 of the wippen 31 so that the wippen and the repetition lever move through eccentric arcs. A spring 45 carried by the repetition lever maintains the contact both of the repetition lever with the hammer and of the wippen with the key. In this construction, as the parts are raised on key actuation, the spring 45 bows, and by its turned over end 47, Fig. 6, causes the escapement of the jack 35 from the knuckle 39. On release of the key, the spring 45 restores the jack by acting on its tail 37, and a hook member 60 on the wippen assists to draw the repetition lever down. A second spring 50 is carried by the repetition lever 32 and held at the other end by an adjusting screw 51 so as also to tend to lift the repetition lever. The two springs 45, 50 may be made integral, passing through the repetition lever, Fig. 7 (not shown). In Fig. 8, a "set-off " button 146 is provided for the jack, the spring 135, of which the tension is adjusted by a screw 138, sliding on the tail 130 of the jack and assisting in the return movement thereof only. The balance pin 70, Fig. 3, for the key 11 has a key-supporting collar 76 of felt and is screwed into or out of the key-frame 10 by a squared end 12 in levelling the keys.