US441438A

US441438A - Piano-forte straining-pin

Info

Publication number: US441438A
Authority: US
Publication date: 1890-11-25
Anticipated expiration: 1907-11-25

Description

(No Model.) H. B. NIOKERSON.

PIANO FORTE STRAININ-G PIN.

No. 441,438. Patented'Nov. 25, 1890.

@(QUZW 7 UNITED STATES PATENT OFFICE.

IIIRAM B. NICKERSON, OF NEW BEDFORD, MASSACHUSETTS.

PIANO-FORTE STRAlNlNG-PIN.

SPECIFICATION forming part of Letters Patent No. 441,438, dated November 25, 1890.

Application filed February 26, 1889. Serial No. 301,292. (No model.)

To all whom it may concern.-

Be it known that I, HIRAM B. NICKERSON, a citizen of the United States, residing at New Bedford, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in Piano-Fortes, of which the following is a specification.

My invention relates to the string-plate of a piano-forteandthedevicefor givingthe proper tension to the strings which are stretched thereon; and it consists in the peculiar construction of that part of the string-plate in which the devices for straining the strings are located, and in the peculiar construction of the straining devices, by means of which the strings are brought to the proper degree of tension, and also in the peculiar construction of the string-plate. I

In the accompanying drawings, Figure 1 represents a view in perspective of a section of a string-plate of a piano-forte, showing my improved construction. Fig. 2 represents a plan view of a section of a device for preventing the string end of the straining devices from turning while tension is being given to the strings. Fig. 3 represents a view in crosssection of my improved straining device and the straining-abutment in which it is located. Fig. 4 represents a view of my improved straining device as it appears when removed from the straining-abutment and showing the manner of attaching the string to the same. Figs. 5, 6, 7, and 8 are views of a different construction of the string end of my improved straining device. Fig. 9 is a view in vertical cross-section of my improved string-plate, showing the strings passing through the plate.

In Fig. 1, arepresents a section of the stringplate of a piano-forte, the upper portion 1) of which is deflected to the rear, and'then brought forward to practically form the arc of a circle, as Z, whose center is the bridge 25. f represents the strings of the piano-forte. 6 represents a block, preferably of metal, having apertures g, provided with grooves 72, which loosely inclose the string ends of the straining devices. The strings of the piano are attached to the ends of the straining devices by passing the end through the perforation j and then coiling it about itself, as at s in Figs. 3, at, and 5. The wire which projects beyond the circumference of the straining device fits in the groove h, and thus the device is prevented fro m turning when tension is being given to the string.

In Fig. 3, m is a rod having head 0, chiselpoint p, and laterally-perforated at j. n is a tube having eXteriorly-squared top and interior shoulder 10, and screw-threaded on the outside to correspond with screw-threadin the strainingabutment l. The rod an is 1nserted in the tube n and the string f attached,

as shown in Fig. 4., and the tube n is then screwed into the straining-abutmentl from the under side, and then by a key or wrench is revolved to the left until the string has the proper tension.

In Figs. 5, 6, 7, and 8 is illustrated a diiferent construction of the string end of the straining device. Fig. 5 shows the string attached to the end of the straining device in the proper manner, while Figs. 6 and 7 show the manner in which the grooves in which the loop of the string lies are out, while Fig. 8 shows the direction and depth of the grooves on the end of the bar. The groove i is cut diagonally across the end of the bar and of such a depth that the pull of the string when it is attached, as in Fig. 5, will be from the center. The groove 10 is cut parallel with the length of the rod and directly in line with the perforation j, as is fully shown in Fig. 7.

In Fig. 9 the top of the string-plate is deflected to the front and then carried to the rear to form the arc of a circle whose center is the apertures q, through which the strings f pass to the front of the plate and over the bridge 75.

WVhatI claim, and desire to secure byLetters Patent, is-

1. In a piano-forte, the combination of a when the string is attached its thickness will lie outside of the circumference of said rod, with a bar of metal or other suitable material adapted to lie against the deflected portion of the string-plate and apertured to loosely 1), lateral aperturej, and head 0, and the tube n, exteriorly screw-threaded and provided with squared top 1' and having interior shoulder w, on which the head of the rod m rests, all as shown and described.

HIRAM B. NICKERSON.

Witnesses:

J. L. GILLINGHAM, HENRY W. MASON.