US1968695A - Miniature upright piano - Google Patents

Description

July 31, 1934.

Filed June 8, 1932 liven/0r:

us/a/Wo/demor Z and/ro/m UNITED STATES PATENT OFFICE MINIATURE UPRIGHT PIANO Gustaf Waldemar Lundholm, Stockholm, Sweden Application June a, 1932, Serial No. 616,054 In Sweden June 16, 1931 2 Claims. (01. 84-174) The present invention relates to an improvement in miniature upright pianos in which the keyboard is located above the soundboard and the iron frame of the instrument, and the Strings 5 and the piano action or hammer mechanism are located behind said frame and below the keyboard. In instruments of this kind as hitherto constructed the mechanism is carried by the side walls of the piano. This arrangement has the disadvantage, however, that if the side walls warp,

as might easily happen, the mechanism is displaced from its proper position with relation to the strings.

The present invention has primarily for its purli pose to obviate this disadvantage, and it consists principally in that the iron frame is provided with rearwardlyv projecting brackets or arms which serve to support the mechanism which may thus be mounted in place independently of the side walls of the piano. In this way it is ensured that the mechanism is always retained in correct position relatively to the'strings. From the point of view of manufacture it is also a great advan tage that the entire instrument can be assembled before the side walls are fixed to the same.- The brackets may suitably be provided with. pivots or the like on which the mechanism is pivoted so that it may be swung rearwards for the purpose of facilitating intonation of the piano.

A constructional form of the invention is illustrated by way of example in the accompanying drawing. The drawing shows a vertical section of a piano constructed in accordance with the 3 invention.

Referring to the drawing, 1 denotes the keyboard, and 2 denotes the keyboard .bottom which is fixed by means of screws direct to the wrest plank 3, 4 denotes the soundboard which forms to facilitate the tuning. The pianoaction orv hammer mechanism 8, which is of the usual construction, is positioned behind the iron frame 5 below the keyboard and is actuated by the keys of the latter in a well-known maxmer by means so of metal wires 9 or other suitable connecting members. According to the invention the iron frame 5 is provided with two rearwardly projecting brackets 10, one at each side, said brackets being provided with pivots 11 on which the 56 frame 12 supporting the mechanism is pivoted.

' side of the same belowlsaid keyboard, said frame imam By this arrangement the entire mechanism may be swung rearwards, to the right in the drawing, on the pivots 11 when the piano is to beintoned so that this work is considerably facilitated. The provision of the brackets 10 for supporting the mechanism ensures that the mechanism is retained in its correct position relatively to the strings 6, and that the entire instrument can be assembled and intoned before theside walls 13 are aflixed. v

The constructional form above described and illustrated in the drawing is only to be regarded as an example and may, of course, be modified in several respects as regards its details without departing from the principle of the invention.

'Forinstance, instead of making the brackets 10 being provided with rearwardly projecting brackets, and a piano action supported by said brackets on the rear side of said frame below said keyboard.

2. In a miniature upright piano, the combination of a vertical iron frame, a soundboard, a keyboard above said iron frame and soundboard, strings attached to said iron frame on the rear side of the same below said keyboard, said frame being provided with rearwardly projecting brack-

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