DE1547554A1 - Stop mechanism for concert grand piano - Google Patents

Description

PATENT ENGINEERS F.W. HEMMERICH ■ GERD MOILER-D. SIZE 21

4DOSSEIDORFIO-HOMBERGERSTRASSES £ .H · 19

i _{P / rlPr /} bh.bi

NIPPON GAKKI SEIZO KABUSHIKI KAISHA, HAMAMATSU-SHI, JAPAN Stop mechanism for concert grand pianos

The present invention relates to a stop mechanism for concert grand pianos, which has to transmit the movements of the keys to the hammers} However, this invention is particularly concerned with such a notification mechanism * which with regard to his announcement conditions set as desired or can be adjusted

With a stop mechanism for Concert grand piano showing the movement of a key on a Little hammer has to transfer »so this little hammer against can strike the strings, such a movement is brought about by the upward movement of a Button is transferred to a lever and this one too Upward movement granted · The one who moved so upward Lever hits a roller on the hammer, which is so arranged "that it - with the upper end of the mentioned lever is in connection, against a hammer at. Such a release mechanism is constructed like this » that the spits "or the" upper "end of the lever are no longer included is related to the role on the Haoerchen, when the striking mechanism once to strike the strings has been operated *** »» ο that the Htamerchen also then returns to the initial position can fall back if the key is still is depressed. If the button moves a little towards the exit position, only to be depressed again, then the mother is pushed up again under the action of the return lever · and the return spring »

909843/0169. _u .

BATH ORIGINAL ATENTING ENGINEERS FW HEMMERICH GERD MÖLLER D. GROSSE 21 15U DÜSSELDORF 10 ■ HOMBERGER STRASSES

5.H.1967

so that the tip or the upper end of the already mentioned Lever can move back under the roller, which is arranged on the lower surface of the hammer. Usually the return spring is at one end so attached under the reset lever that it is with this end © in a recess, which in the lower surface of the reset lever © is worked in, can slide. To ensure that the stop mechanism functions properly As obtained below, the restoring force can be adjusted by bending part of the spring.

One such adjustment of the restoring force, soft on the springs while d ^ s · manufacture of flights), or · pianos wirä performed _s for Anschlagsbeüirsgungen and data also für'die playing conditions wv of. «, Relsr k ^! ; ighness.

Is the. The restoring force is not sufficiently large , so the return lever cannot transfer enough force to move the Roll® on the combing line forward. This results dsnn _e that during the brief period in which the button - "- is depressed again, is impossible" the aforementioned lever return to the starting position was even before they return to their original position. But on the other hand, is stored in the spring restoring force so great, then you could _t because the lever can quickly get to striking the strings back to its starting position under the available on the Hammers Chan role "aas re-striking the strings be accomplished quickly. However, because the hammer is pushed strongly upwards by the return lever, bypassing the return spring, it is feared that the hammer? ::. :: hen can strike the strings with too much force.

Even if the little hammer does not strike the strings, the effect of the rebound "Ilsto3cf" leads to an unpleasant

90984 3/0169 -E3-

BATH ORIGINAL

PATENT ENGINEERS F.W. HEMMERICH GERD MDUtR. D. LARGE 21

DDS5EIDORF 10 · HOMBERGER SIRASSEJ R U 1 9 ß7

take effect on the pianist's fingers. But so there is a need that the spring within a

narrow-range-can-be-adjusted-or "readjusted", which then ensures that the strike mechanism can track the movement of the key, too when that key is depressed again within a short period of time, which then continues it is ensured that there can be no reaction from the hammer to the key.

However, it is not easy to find one made of elastic material - e.g. piano wire or phosphor bronze wire Spring, which is also inserted into small gaps (usually about 8 mm) is used to deform plastically. Even if there is a possibility of constant springs To use shape and constant restoring force, it is impossible to measure the weight of the keys and the frictional resistance for all the stroke mechanisms assigned to the 8 8 keys All moving or sliding parts should be designed in a uniform manner «In order to have a uniform To obtain operating behavior or a uniform stop behavior, each individual spring - how previously mentioned, carefully and precisely what should be set by well-trained specialist engineers and technicians of course, a great deal of work and time required. lent.

The present invention aims to create a new stop _{mechanism t} a stop mechanism for concert grand pianos, the stop and operating behavior of which can be set and readjusted easily and precisely.

909843/0169

PATENT ENGINEERS FW HEMMERiCH GERD MOLLER D. GROSSE 21

4 DÜSSELDORF 10 -HOMBERGE * STRASSE 5

"...___. 5.4.1967

-EH-

The present invention provides a concert grand piano with one arranged for pushing up a reset lever Spring before, one end of which is mounted in a spring capsule connected to a threaded bolt. Of the The threaded bolt is arranged under the reset lever and screwed into this reset lever. Will now be the set screw set in rotation, then the position of the spring capsule is changed, which then also the restoring force the spring is adjusted or readjusted. By means of this device mentioned above, it is possible to reduce the restoring force to bring quickly and precisely to the best value, which s s the stop conditions of the assigned stop mechanism - namely the frictional resistance of the various rotatable or tiltable parts or the weight of the hammer - corresponds.

Another object of the present invention is to provide an improved fence mechanism for Concert grand piano, by means of which such changes in the touch characteristics can be avoided, which arise after prolonged use of the spring or from changes result in the weather · Such an improvement is achieved by the use of such materials, which have great abrasion resistance and their coefficient of friction themselves under the influence of those in the atmosphere only change the moisture contained in it very slightly. These materials are for the spring capsule.

-Gl- 909843/0169

BAD ORfGlNAL

PATENT ENGINEERS F. W. HEMMEIICH · GEiD MDlLEI-D. SIZE 21 154 DDSS EL DO RF 10 H OMSE RGER S TR A SS ES Tn ~ η

5 · H »lab /

The present invention may be better understood after reading the following detailed description and the drawings attached to this patent specification are used as an aid »In detail:

Figure 1 is a side view of an embodiment of a stop "

mechanism'üsses for concert grand piano »whereby this execution the principles associated with this invention have properties.

Figure 2 is a partially sectioned side view the important part of the figure i ge

showed Asisehllagmechanismueses.

Figure 3 "ine partially iir. Sectional side view the essential part of a modified one falling within the scope of this present invention Execution of the stop mechanism.

Kit the drawings attached to this patent specification, in particular with Figures 1 and 2, a stop mechanism is shown, "richer between the piano key 1 and a Hflmmerchen 2 is arranged · This stop mechanism nism consists of a support t, which is rotatably mounted with one end in the bracket 3 * a back part lever 6, the center point of which is rotatably mounted in a bearing block S connected to the support "H " and a lever 8 which is connected to that of the bracket 3 opposite End of the support H is rotatably connected and for hitting of the hammer 2, the roll 7 located on the ridge of the sky has to be pushed upwards "The upper or free" end of the lever 8 is set by a lever in one end of the reverse lever 6.

SOf043 / 01tt ~ ^G2 "

BATH ORIGINAL

PATTNTING ENGINEERS F. W. HEMMERICH -GERD MÖLLER. D. SIZE 21 15 H. DDSSEIDORF 10 · HOMBERGE «STRASS E 5

- G 2 -

Machined bore 9 so that, when the stop mechanism is actuated once to strike the string, the lever 8 can move clockwise in the bore 9 until its tip or its upper end has reached a position in which it is the lower surface seconded the heme JnsrchfeiTE roller 7 does not touch, the Rücketelliväbei 6 and the lever 8 are seen with the ent · "spx ¹ · before ^ AEEN stop devices 10 and 11 /, which" determine the Anschlagepositionen the two aforementioned lever ·

■ Mi U9P underside of the back-up lever S a® ederkapsel 13 is arranged. This F- ^ cpkapsel is connected to a threaded bolt 12, which is screwed through a lever 6, as can be seen best from Figure 2, is one end of the Eückst <sllf @ dea? Inserted into a recess IH arranged in the vein capsule 13 in order to keep the aforementioned lever under pretension. In order to be able to turn the threaded bolt, a recess is provided at the upper end, which is located above the upper edge of the lever 6 * At its lower end, the threaded bolt has a disk-shaped head 17 »which is located in the recess 16 of the Spring capsule 13 is located and in this way holds the spring seat in a rotatable manner. By turning the threaded bolt, the between the spring capsule 13 and the lower edge of the lever

2δ located distance either reduced or increased « Corresponding to the movement of the spring capsule, however, the bending angle 6 of the return spring 15 also becomes smaller or smaller larger, in which case the reset lever to caen pressing force is set or readjusted.

If by means of the threaded bolt, the spring capsule 13 in a appropriate position is set and, if under these conditions button 1 is pressed to strike the string

909843/0160

BATHROOM ORIGINAL - S 3 -

PATENT ENGINEERS F. W, HEMMERICH · GERD MSLIp · D. G8OSSE 21 IBM

DDSSELDORF 1, BERLINER ALLEE 3 <-3i _c .

will} then the movement of the key is like that on the. Transfer support U that this - as can be seen from the drawing - rotates counterclockwise about the bracket 3. If the support rotates in this direction, the lever 8 sitting on one end of this support and the roller 9 on the hammer are given an upward movement so that the hammer 2 is rotated and the strings are struck.

If the hammer moves down again after striking the strings, then there is a connection of Stop mechanism and the roller 7 located on the hammer, because at this time, however, the lever 8 in the bore 9 of the reset lever 6 has brought itself into a position in which it is no longer with the hammer attached roller is in connection, the hammer with its roller 7 the reset lever 6 down slightly Press, whereupon the rotary movement of the hammer is finally activated by a button 1 on the rear part / tier upright stop device comes to a standstill.

If the button 1 can now move slightly to its starting position during successive strikes on the strings, then the reset lever 6 presses the roller 7 on the hammer upwards under the action of the return spring 15, whereby the lever B can return to its starting position and thus with it its tip or its upper end is again with the hammers attached to the roller 7 in combination, characterized the stop mechanism is returned to the location, the next from the button 1 up caused

-64- 909843/0169

BATH ORIGINAL

PATENT ENGINEERS F. W. HEMMERICH. GERD MÖLLER D. GROSSE 21 l & if DOSSELDORF 1, BERLINER ALLEE 34-36 ~~~

5.4.1967

upward movement for the purpose of plucking the string again to be transferred to the hammer 2

The operating and stop conditions of the stop mechanism are influenced by the magnitude of the restoring force stored in the restoring spring. The one in the The scope of the present invention covered improved stop mechanism, the size of the the spring to be stored restoring force by turning the threaded bolt 12, which with a displacement of the , the spring capsule 13 seated on the bolt can be reached · If the restoring force stored by the spring 15 is too small to use the restoring lever 6 to achieve the To push the roller located in the hammer so far upwards, that the upper end of the lever 8 again correctly under the the roller located on the hammer comes, then the threaded bolt 12 is rotated so that the distance between the upper Area of the spring capsule 13 and the reset lever 6 becomes larger. By doing this, the angle becomes the curved The spring 15 is reduced in size, which means that a force that is sufficiently strong to move the reset lever 6 upward from now on is present · This is then something other than bringing about a plastic deformation of a spring. Is on the other Page the restoring force stored in the spring 15 big, then the hammer falls after striking the string down and presses on the reset lever 6, whereupon the excessive resetting force stored by the spring tries to make the hammer bounce. This can the string struck without the key being effective borrowed has been depressed.

by the effect of the impact, a shock will be transmitted to the button. In the illustrated and erl & uterten ^ construction, however, the threaded bolt 12 in its can

809843/0169

SAD

PATENT ENGINEERS FW HEMMERICH GERD MÖLLER D. GROSSE 21 DOSSELDORF 1, BERLINER ALLEE 34.3 « _c .

- over

Direction of rotation are rotated so that the restoring force to be stored by the spring is reduced. In any case, however, turning the threaded _{bolt results in a small (} but inevitable change in the distance between the spring capsule 13 and the reset lever 6) In other words: the reset force can be set or readjusted very precisely within a desired narrow range.

As can be seen from Figure 3, the contact of spring

capsule and spring are improved in that a concave and spherical recess on the underside of a spring seat 21 is provided. In this recess the one end of the spring, which is bent with a small radius, is pressed in · This arrangement is therefore selects because with her the contact area between spring 23 and spring seat 21 is very small and almost one point equals, whereby the friction between these two components is reduced to a great extent, In addition is a free rotation of the reset lever through this Measure ensures · The other structural elements that make up an embodiment according to Figure 3 is composed, but which correspond to those from Figure 1 and Figure ί, will also listed with the reference numbers given for you in these figures! so it is not necessary to have them here to describe again

The spring capsule shown in FIGS. 1, 2 and 3 is made of a material whose mechanical strength is so great that it does not cause excessive deformation or even breakage due to the the spring caused contact pressure, the abrasion resistance of which was so great that the rubbing action

$ 08843/810 »-:« ■ * -

ORIGlNAL BATHROOM

PATENT ENGINEERS F. W. HEMMERICH. GERD MDLLERD. SIZE 21 154

4 DDSSELDORF 1, BERLINER ALLEE 34-30

5.4.1967,

1 ©

the spring cannot damage the spring seat. Because the The friction and pressure transferred from the spring to the spring capsule are not so great, metals, e.g. steel ■ or aluminum or many plastics are used for this purpose. What the weight of the spring capsule and their economical production is concerned, it would be advisable to manufacture the spring capsule from a material which can be easily molded by injection molding, e.g., a synthetic resin such as a polyamide plastic or a Polyacetate plastic. The threaded bolt can also made of a similar material. In this case, the spring capsule is manufactured so that it is according to Figure 3 can accommodate the bent end of the spring, then the spring capsule can be tilted or rotated without some damage to the spring occurs, so that the spring capsule and threaded bolts are manufactured as a single part can what should happen when they are connected to each other without a relative rotational movement between them should arise.

The construction described above offers good protection for the working conditions of the stop mechanism against the friction that occurs after a long period of time or against the moisture contained in the atmosphere and its fluctuations

Impact mechanisms in which the return spring is

is located directly in a recess of the wooden return lever, the effect of the friction caused by the stop mechanism gradually wears the lower surface of the recess; but with that the Attack conditions that were originally set to the desired conditions deteriorated.

- G 7 -

909843/0168

PATENT ENGINEERS FW HEMMERICH · GERD MDLLER-D. SIZE 21 15 ¹ I.

4DOSSELDORFIO-HOMIERGERSTITASSES t ^.

In addition, the wooden reset levers take due to of fluctuations in humidity - moisture on or dry out, which also leads to fluctuations in frictional resistance leads between lever and spring. But the concert grand piano or the upright piano cannot do this Maintain constant playing conditions. However, the aforementioned material, metal or plastic, is used for the spring capsule and its construction, then the fluctuations caused by moisture or changes in the friction and in the frictional resistance are avoided, so that the predetermined constant stop conditions can be maintained over a long period of time.

The increase in manufacturing costs, which is caused by the creation of the spring capsule, is of the Saving in labor and time that would otherwise be necessary to adjust the spring, perfectly balanced. The one for the fine adjustment of the return spring in the stop mechanism according to this invention could be reduced to only 20 minutes, compared to a period of 60 to 80 minutes required to adjust the stop conditions of a stop mechanism by the fact that, as it Up until now it was common practice to plastically deform a spring.

- A 1 -

90984 3/0169 _BAD

Claims (3)

PATENT ENGINEERS f. W. HEMMERtCH · OEHD MDUEK- D. GROSSE 21 15 ¹ I 4DOSSELOORFIO-HOMIEKeERSTRASSES -. 3 ¹ -Al- NIPPON GAKKI SEIZO KABUSHIKI KAISHA. HAMAMATSU-SHI. JAPAN Claims I) / A stop mechanism for concert grand pianos, consisting of from a support functionally connected to a button, a return lever rotatably mounted on this support, a lever rotatably connected to one end of this support, this lever extends through a recess provided for him, the aforementioned reset lever over a hammer a roller connected to this hammer has to push upwards} as well as from one of the aforementioned Return lever arranged return spring, which the Has to push the reset lever upwards so that the reset lever moves the roller on the hammer Above can press after striking the string the aforementioned lever, which is removed from the roller has to bring it back to the roller attached to the hammer, characterized in that on the aforementioned reset lever, namely below, a spring capsule is provided which has to accommodate one end of the return spring »on a threaded bolt sits on and with this threaded bolt, which is screwed continuously to the reset lever, with the Reset lever is in communication, so that by turning the threaded bolt, the distance between the Spring capsule and the reset lever can be reduced or enlarged » 909843/0169 - A 2 - BATH ORIGINAL PATENT ENGINEERS F. W. H E M-M E R I C H ■ G E R D M O L L K R · D. G R O S S E 21 15H ^ DDSSEIDORFJO-HOMBERGERSTRASSES ~ 5,4,1967 . 1B47554-A2-73 2) A stop mechanism for concert grand pianos according to claim 1, characterized in that the aforementioned spring seat with the threaded bolt is rotatably connected and a longitudinal slot for receiving the aforementioned return spring having, 3) a stop mechanism for concert grand pianos according to claim 1, characterized, that the already mentioned return spring is bent at one end, bend with a small radius, the surface the already mentioned spring capsule has a recess whose deepest point is in the middle and that the already mentioned spring is accommodated with its bent end in this recess. Ό A stop mechanism for concert grand pianos according to claim 3, thereby geke η η draws, dftA rush already mentioned spring capsule and the already mentioned threaded bolts are manufactured as a single piece, S) A Hetttigungsttechanistttts for a concert grand piano according to the preceding claims, characterized in that that the above-mentioned spring capsule is made of a durable material whose abrasion resistance does not change under the influence of temperature. '800 * 43/0168 - End «- ■■ '. "■ \ ■ BAD ORIGINAL ·