GB355816A - Improvements in or relating to pianofortes - Google Patents

Abstract

355,816. Pianofortes. AXTENS, R. A., 38, Beaconsfield Street, Princes Avenue, Liverpool. May 30, 1930, No. 16695. [Class 88 (ii).] Relates to a vertically strung pianoforte in which the frame is built up of angle-irons or the like, the ends taking the main strain of the strings, which pass over a single soundboard bridge arranged as near the centre of the soundboard as possible, the strike line A, B, C, Fig. IV, being broken to permit this. Diagonal belly-bars 38 are preferably glued to both sides of the soundboard, either opposite one another or alternating. The bridge may overhang on either side over the whole or part of its length, as indicated at 37. D, E, F are the upper bridges. The ends of the frame consist of pairs of angle-irons 1, 1<1> and 4, 4<1>, Fig. I, riveted together, or of plates, united by horizontal angle-irons 11, 12, 14, which in turn are united by vertical angle-irons 16, 18, 20. Other vertical angle-irons or the like are arranged at the back and secured to horizontal and oblique plates 22, 21 taking the hitch-pins. The ends are stiffened by horizontal and oblique stays 5 .. 10, to which are attached bars 28 .. 32 forming the key-bottom. The wrest-plank fits between the angle-irons 11, 12. The case-work is screwed direct to the metal frame. The action, Fig. VI, of under-damper type, is made in sections to correspond with the different strike lines, and is carried on independent rails 42, 43, 44. The damper pivots 41 are lower than the hammer pivots 45, and the damper spoon 48 contacts with the damper arm 47, which is pressed by a spring 63, at a point 46 between the damper pivot 41 and the wippen pivot 50. The damper lift-rail 49, operated through an arm 49a, contacts at a point between the pivots of the damper and the lift-rail. The hammer-butt 54 is pressed by a recoil spring 56 and has a balance hammer 57 which contacts with a check 58 loosely pivoted at 59 and moved by a button 60 carried by the wippen 51. The fall of the wippen is assisted by a spring 51a. The soft (half-blow) pedal raises a rail 65 supported on links 67a, 69a and contacting with the wippens in horizontal line with their pivots 50. Specifications 3724/80, 5859/85, 506/92, 9373/93, 24646/98, [all in Class 88, Music &c.], 17075/14, 237,022, 267,194, and 287,652, [all in Class 88 (ii), Music &c.], are referred to.