US1353645A - Pianissimo device for upright-piano actions - Google Patents

Description

F; LLGEORGE. PIANISSIMO DEVICE FOR UPRIGHT PIANO ACTIONS.

APPLICATION FILED SEPT. 9; I9I9.

1335?),645. PatentedSept. 21, 1920.

['7 6; I. '1 Fl 6. 2. E 42 24 I 3 38 o 37 r v A A 44 l I I I I l 0 r 45 O I I I c p I ll /4- /Z I 20 9 19 L -2 f1i 7 3 FRANK L. GEO/P65 TTORNEYS.

UNITED STATES PATENT OFFICE] FRANK L. GEORGE, OF LOS ANGELES, CALIFORNIA.

PIANISSIMO DEVICE FOR- UPRIGHT-PIANO ACTIONS.

T 0 all whom it may concern Be it known that I, FRANK L. GEORGE, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Pianissimo Devices for Upright-Piano Actions, of which the following is a specification.

My invention relates to pianissimo mechanism for actions for upright pianos and consists of the novel features herein shown, described and claimed.

The pianissimo pedal, generally known as the soft pedal, in all upr'ght actions has for so many years been an imperfect quantity, and all attempts on the part of inventors throughout the world to perfect it has for so many years met with dire failure, that the entire piano world from manufacturer down through the gamut of commercialism clear on to the home of the final purchaser has long since been resigned to its fate and accepted with a sigh the inevitable. Some of the greatest inventive genius in the piano world during the past forty years has been devotedto solving the problem of the lost motion in the upright soft pedal, and while some few have met with slight success none have worked out a thoroughly practical device, so that during the past few years the world has come to look upon this imperfection as one to be endured as it could not be cured. My object is to produce a construction which will overcome the above and other objections.

Aftermany years of close application and experiments. attended by repeated failure, I have succeeded far beyond my most sanguine hopes and have at last produced a device closely approaching perfection yet extremely simple in its design, which not only absolutely controls the 10st motion in this pedal but also furnishes the means of immediately controlling, within the space of three minutes, the permanent hammer stroke. To accomplish this piece of regulation under the present forms of action construction it re quires practically a whole day, as the entire action must be re-regulated, and at best it would require several hours for an expert regulator to accomplish it. I have named my invention the to-nom-e-ter, meaning tone measurer.

Figure 1 is a side elevation of a piano action having a tonometer or soft pedal construction embodying the principles of my in;

Specification of Letters Patent. Patented Sept. 21, 1920. Application filed September 9, 1919.

Serial NO. 322729.

vention, the supporting parts being shown in cross section and showing the parts in their normal positions as when the soft pedal is not operated and when the key is at rest.

Fig. 2 is a view analogous to Fig. 1 and showing the parts in their positions as when the soft pedal is operated.

Fig. 3 is a fragmentary side elevation showing a modified form of the capstan screw or adjusting screw connection between the key and the action.

The rear end of the key 1 normally rests upon the felt 2 supported by the key-frame 3. The action bracket 4 is rigidly mounted upon the key-bed 3. The lower abutment 5 extends backwardly from the lower end of the bracket i and a felt 6 is mounted upon the lower abutment An arm 7 extends forwardly from the lower end of the bracket 4: and an upper abutment 8 extends backwardly from the bracket 1 some distance above the abutment 5.

The small action rail 9 has a capstan screw l0 tapped upwardly from the lower face and the head of the screw 10 rests upon the felt 6. An expansive coil spring 11 is placed between the rail 9 and the abutment 8. A swinging arm 12 is rigidly connected against the front side of the rail 9 and is connected to the forward end of the arm 7 by a pin 13.

The brackets 4 carrying the abutments 5 and 8 and the arms 7 are at the outer sides of the collection of actions and the capstan screws 10 are near the ends of the small action rail 9. Flanges 14 are secured to the small action rail 9 one for each action. The lower swing 15 is connected to the flange 14 by a pin 16 and extends forwardly in a horizontal position. An abstract 17 is connected to the forward end of the lower swing 15 by a pin 18. The lower swing 15 has an extension 19 offset upwardly in front of the pin 18. An adjusting screw 20 is screw-seated through the extension 19 and rests upon the rocker 21 fixed upon the key 1.

The intermediate action rail 22 is fixed in the bracket 4. above the small action rail 9 and the main action rail 23 is fixed in the bracket 4 some distance above the intermediate rail 22. The action 24 is mounted upon the main action rail 23 and the details of this action are shown, described and claimed in a. companion application. Serial No. 322728.

The equalizing damper 2.5 is mounted pon t main t n rail 23 up n the intermediate action rail 22, and the details of the equalizing damper are shown, described and claimed in the companion application above mentioned. I

The lifter bar 26 is connected to the cen tral portion of the swinging arm 12 by a pin 27. The hammer rest rail 28 is connected to the upper end of thelifter bar 26 by a pinv 29, and to the action bracket 4 by an arm 28 The soft pedal rod 30 is slidingly mounted through the'key-frame 3 and has a pin 31 extending from its upper end and engaging in a socket opening 32 formed from the lower face 33 of the hammer rest rail 28 so as to hold the soft pedal rod 30 from slipping out of connection with the hammer rest rail 28. The soft pedal rod 30 is mounted through the key-frame 3 and the rod is connected to the soft pedal.

The regulating rail 34 is connected to'the main action rail 23 by arms 35 and the regulating rail 3% is "cut short enough to pass between the vertical swings 26 and between i the soft pedal rods 30, the links 26 and pedal rods 30 being duplicated at either'end of the piano. v 7

An abutment 36 extends forwardly from the bracket 4. A felt 37 is mounted upon the abutment 36. A. capstan screw 38 is tapped upwardly into the hammer rest rail 28 from its lower face 33 and rests upon the felt37, there being acapstan screw 38 .and

4 cooperating parts at each end of the, collectionof actions. Instead of the regulating screw 20 bearing upon the key rocker 21, as shown in Fig. 1,

' the capstan screw 39 may be tapped into the V key and engage a felt 4L0v secured to the extension 19 as shown in Fig. 3, but the construction shown in Fig. 1 is preferred. The preferred construction is easier to regulate, is much more quickly operated and reduces the cost to the piano maker, as he does not have,tobuy and set the capstan screws with the regulating screw.

The smallaction rail o flange rail 9 may be provided with seve al of the metal swings wise secured to the abutments The purpose of the springs is to exert a flexible pressure on the flange rail. Theverticalswings 26 serve as lifter bars for raising the flange rail 9 when the soft pedal is operated.

The capstan screws 38 serve to adjust the hammer rest rail 28 to its proper normal position to regulate the normal Striking disin' the keys.v The action comes a ready fitted and placeproper tension upon. the parts.

Through the lifting motion of the pedal rod 30 when the soft pedalis operated the hammer rest rail 28 is moved upwardly and forwardly on the swing 28 and this movement carries the'hammer 42 forwardly to the correct striking distance from the wire etl,.as shown in Fig. 2. This motion of the hammer-rail28 through the lifter link 26 raises the rear end of the swing 12 thereby raising the flange rail 9 therebylifting the rear, end of the swing 15 which is fulcrumed upon the rocker 21 of the key, andthis movement raises the abstract 17 thereby raising the jack 43 in proportion to the upward movement of the hammer butt 4A thereby keeping the upper end of the jack 43 at all times accurately adjusted to the back stop 15 ofthe hammer butt and at this time this entire movement causes the jack extension or heel 46 to be automatically adjusted with perfect accuracy to the escapement or regulating screw d7. 7

The contactpoint between the jack heel 46 andthe regulating screw 47 has always been the one great stumbling block in the gives to the world an absolutely practical and reliable tonometer. w

So far as thenormal action isconcerned,

the two capstan screws 10 and 3'8'areiof great importance. Simplyby properly operating these two screws the action is instantly, accurately and. permanently adjusted to regulate the normal'hammer throw p or striking distance, and when the soft pedal is properly connected no further adjustment is necessary, and the adjustment when 'prop-s erly made is permanent.

.Thus I have produced soft pedal construction for upright pianos the leading fe'a tures of which areas follows: Action brack et's having, flange rail abutments extending backwardly from their lower ends and swing supporting arms extending forwardly from their lower ends, a lower actionrail having rigid swings extending forwardly and pivotally connected; to the swing supporting arms and capstan screws extendingdownwardly and supported by-the flange rail abutments, upper flange rail abutmentsex-v tending backwardly from the action brackets, springs inserted between the upper. flange rail abutments and the flange rail. hamineinrest rail abutments extending forwardly from the upper parts of the action brackets, hammer rest rails having capstan screws supported by' the hammer rest rail abutments, vertical swings connecting the hammer rest rails to the central portions of the action rail swings, lower action swings connected to the lower action rail andsupported by the rear ends of the keys, actions having stickers pivotally connected to the lower action swings, and soft pedal rods engaging the hammer rest rails.

Various changes may be made without departing from the spirit of my invention as claimed.

I claim:

1. A pianissimo device for upright piano actions comprising in combination, action brackets having lower rail abutments extending backwardly from the lower ends thereof and swing supporting arms extending forwardly and opposite to the lower rail abutments, a lower action rail having rigid swing arms extending forwardly and pivotally connected to the swing supporting arms and having capstan screws extending downwardly from the rail and adapted to bear upon the lower rail abutments, upper rail abutments extending backwardly from the action brackets and in vertical aline ment with the lower rail abutments, springs inserted between the upper abutments and the lower action rail, hammer rest rail abutments extending forwardly from the upper part of the action brackets, ahammer rest rail having capstan screws extending downwardly from the rail and adapted to bear upon the hammer rest rail abutment, links connecting the hammer rest rail to the rigid swings of the lower action rail and intermediate of their ends, lower action swings connected to the lower action rail and ex tending forwardly and bearing with their outer ends upon the piano keys, abstract members connecting with the swings carried by the lower action rail and at a proper distance backwardly of the point of bearing upon the piano keys, and jacks connected to the abstracts for operating the hammers.

2. In a pianissimo device for upright piano actions, in combination with a hammer and a key and mechanism connected with the key for operating the hammer, a hammer rest rail mounted to swing toward the strings of the piano, a support for carrying the hammer rest rail in a normal position, means for raising the hammer rest rail off its support thereby advancing the hammers toward the strings, and means for raising the mechanism for operating the hammers properly in unison with the movement of the hammer rest rail without changing the point of contact of the hammer mechanism with the piano keys.

3. In a pianissimo device for upright pianos, in combination with a hammer, a key and mechanism connected with thekey for actuating the hammer; a hammer rest rail mounted to swing toward the strings of the piano, a support adapted to carry the-rest rail in a normal position, means for adjusting the rest rail relative to its position on thesupport, means for raising the hammer rest rail off its support, means for raising the hammer actuating mecha nism in unison with the movement of the hammer rest rail without disturbing its opmounted to move toward the piano strings,

a lower action rail mounted to move toward the hammer rest rail, a link connecting the hammer rest rail with the mounting of the lower action rail, a swing pivotally mounted to the lower action rail and extending forwardly therefrom its forward end resting upon a piano key, means for operating the hammer connected with the swing adjacent to its forward end, and a piano key havin a bearing adapted to receive the forward end of the swing.

5. A pianissimo device for upright piano actions comprising, in combination with a hammer, a key and means operatively disposed relative to the key for actuating the hammer; a hammer rest rail mounted to move toward the piano strings, a lower action rail mounted to move toward the hammer rest rail, a link connecting the hammer rest rail with the mounting of the lower action rail, a swing pivotally mounted to the lower action rail and extending forwardly therefrom, means connected with the swing adjacent to its forward end for actuating the hammer, and an adjustable hearing fixed to the forward end adapted to contact with the piano keys, the bearing being adjustable vertically and thereby adapted to raise and lower the actuating means through a short range of adjustment.

6. A pianissimo device for upright piano actions comprising, in combination with the action, a hammer rest rail mounted to move in an are closely related to the arc of movement of the hammers, a lower action rail mounted to move toward the hammer rest rail, a link connecting the hammer rest rail with the lower action rail, a swing pivotally mounted on the lower action rail and extending forwardly therefrom, the swing being for carrying the piano action operatively, a bearing mounted on the forward end. of the swing adapted to be adjusted of the swing vertically, a piano keyhaving a rbunde'd bearing surface at its rear end adapted to receive and support the adjustable bearing in the forward end of the swing, and means fer moving the hammer rest rail.

7-. In a pianissimo device for upright piano actions, in coinbination with the-haltimen and a, key and mechanism connected with the key for operating the hammer; a

hammer rest rail mounted to swing toward the strings of the piano; a support for ear-- rying the hammer rest rail in a normal positiOn; means for raising the hainmer rest fail fofl? its supp'0rt thereby advancing the hammer toward the strings; and means for raising the 'mechanism fdi' operating the.

hammers properly in unison with the movie- FRANK L; GEORGE.

Images