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公开(公告)号：US20240334119A1
公开(公告)日：2024-10-03
申请号：US18618764
申请日：2024-03-27
摘要： A diffuser capable of evenly and widely diffusing sound emitted from a speaker, thereby making it possible to obtain excellent acoustic radiation characteristics. The diffuser includes a base portion formed into a plate shape and including a through hole having approximately the same shape and size as a diaphragm of the speaker, a center reflection portion formed into a predetermined size corresponding to the through hole and supported by the base portion, and an edge reflection portion that is formed into an arcuate shape protruding at least either forward or rearward of the base portion from a peripheral edge of the through hole of the base portion and having a recessed inner surface, for further reflecting sound reflected from the center reflection portion.
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公开(公告)号：US20240331662A1
公开(公告)日：2024-10-03
申请号：US18618744
申请日：2024-03-27
发明人： Mitsuo YAMASHITA
摘要： A piano including a drop action is provided with an upper first key pivotally movable and a lower second key pivotally supported by a support member and having a front end contacted by the first key. In accordance with depression of the first key, the second key pivotally moves to lift up a wippen of the action via a connection member (wire member), whereby a string is struck by a hammer. The support member has a plurality of support walls formed with bearing grooves which extend obliquely with respect to a vertical direction. The second key includes a pair of shafts protruding toward opposite lateral sides and is pivotally supported by the support member in a state in which the shafts are engaged with bottoms of the bearing grooves formed in each adjacent two support walls.
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公开(公告)号：US20240306810A1
公开(公告)日：2024-09-19
申请号：US18599035
申请日：2024-03-07
发明人： Yasushi TERAI
CPC分类号： A47B23/004 , G10C1/04 , G10C3/00 , G10G7/00
摘要： A music rack unit-mounting structure of a grand piano, for removably mounting a music rack unit on a piano body of the grand piano. Rear ends of a left-side engagement portion and a right-side engagement portion are configured to be capable of being placed on front ends of a left-side guide portion and a right-side guide portion from above, respectively, when the music rack unit is mounted on the piano body from the front. By sliding the music rack unit rearward from the placed state, the music rack unit is mounted on the piano body, while the left-side engagement portion and the right-side engagement portion are fitted on or in the left-side guide portion and the right-side guide portion, respectively.
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公开(公告)号：US20240112657A1
公开(公告)日：2024-04-04
申请号：US18473937
申请日：2023-09-25
发明人： Takuma MURAI
IPC分类号： G10H1/34
CPC分类号： G10H1/346 , G10H2220/221 , G10H2220/265
摘要： A key weight capable of being easily mounted in a key for a keyboard instrument and being positively prevented from falling off the key. The key weight is mounted in the key by being inserted from outside into a weight-accommodating portion of the key, and includes a block-shaped weight body portion, protrusions that are formed on an insertion leading end of the weight body portion into the weight-accommodating portion and are elastically deformed by a reaction force from a far-side wall surface of the weight-accommodating portion when the weight body portion in a state in contact with the far-side wall surface during mounting of the key weight is pushed into the weight-accommodating portion, and latched portions that are formed on side surfaces of the weight body portion and are latched with side walls of the weight-accommodating portion.
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公开(公告)号：US20230317041A1
公开(公告)日：2023-10-05
申请号：US18189143
申请日：2023-03-23
发明人： Satoshi KITO
IPC分类号： G10H1/34
CPC分类号： G10H1/346 , G10H2220/221 , G10H2220/265
摘要： A keyboard device for a keyboard includes a hammer vertically pivotally moved in a manner interlocked with a key having been depressed, and a cushion provided below the hammer, the hammer contacting the cushion from above when the hammer having been pivotally moved upward in accordance with depression of the key returns to an original position in accordance with release of the key. The hammer includes a plurality of protrusions formed at respective spaced location in a rearward sequence from a hammer support shaft, such that they each extend downward. The cushion is formed by a plurality of cushions sequentially contacted by the plurality of protrusions, when the hammer contacts the cushion from above, in order from a protrusion closest to the hammer support shaft toward a protrusion remotest from the hammer support shaft.
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公开(公告)号：US20230098045A1
公开(公告)日：2023-03-30
申请号：US17949960
申请日：2022-09-21
发明人： Tsutomu YAMAGUCHI
IPC分类号： G10H1/34
摘要： A key for a keyboard device includes a resin key body and one or a plurality of woody boards attached along at least part of a side surface of the key body. The key body includes an upper convex part which extends along an upper end of the side surface and is formed continuous with on upper surface of the key body such that it protrudes in a lateral direction of the key body, and a lower supporting protrusion which is disposed in the vicinity of a central portion or a lower end of the side surface such that it protrudes in a lateral direction of the key body and is opposed to the upper convex part. The woody board is sandwiched by the upper convex part and the lower supporting protrusion.
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公开(公告)号：US20220293068A1
公开(公告)日：2022-09-15
申请号：US17653574
申请日：2022-03-04
发明人： Akihiro SUZUKI
摘要： A keyboard device for a keyboard instrument, capable of obtaining excellent touch feeling and stable key stroke without giving sponge feeling or unpleasant vibration during key depression. The keyboard device includes a keyboard chassis, keys pivotally supported on the chassis, hammers swingably supported on the chassis and swinging along with key depression, a hammer upper limit stopper provided on a chassis rear end and contacted by a hammer rear end from below during key depression, and a key lower limit stopper provided on a chassis front end and contacted by front ends of the keys from above during key depression. The hammer upper limit stopper has predetermined flexibility that allows deformation of the hammer upper limit stopper such that after contact of a hammer during key depression, an associated key reaches its lowest position in a state in contact with the key lower limit stopper.
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公开(公告)号：US10410610B1
公开(公告)日：2019-09-10
申请号：US16289337
申请日：2019-02-28
发明人： Yasushi Terai
IPC分类号： G10C3/166
摘要： A damper for a piano, which has a bifurcated damper felt of which a space between two protrusions is difficult to be narrowed. A damper head extends along three strings in a lengthwise direction thereof and is movable in directions in which the damper moves into and out of contact with the three strings. Damper felt is attached to a string-side surface of the damper head such that it extends in a lengthwise direction of the damper head, and includes two protrusions formed to protrude toward the strings in a bifurcated manner such that they can be brought into contact with the three strings in a state inserted into respective spaces therebetween. The damper felt is attached to the damper head such that deformation of the damper felt in which a space between the two protrusions is narrowed is resisted.
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9.发明授权公开(公告)号：US10170086B2
公开(公告)日：2019-01-01
申请号：US15478044
申请日：2017-04-03
发明人： Takaaki Taguchi
摘要： A support device for a pivotal member of a keyboard instrument, in which opposite ends of a pivotal pin fixed to a pivotal member can be each properly positioned in the center of a pin hole, to thereby enable the pivotal member to perform efficient and stable pivotal motion. The support device that pivotally supports the pivotal member pivotally moved by key depression includes a flange body including two support walls opposed to each other with a predetermined spacing therebetween, and two pin holes which are formed in the respective support walls and in which opposite ends of the pivotal pin are inserted, respectively, and two bearings fixed in the pin holes in an inserted state and having opposite ends of the pivotal pin inserted therein, for pivotally supporting the pivotal. Each bearing is formed by a braid formed in a hollow cylindrical shape.
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公开(公告)号：US20170278498A1
公开(公告)日：2017-09-28
申请号：US15459359
申请日：2017-03-15
发明人： Akihiro SUZUKI
IPC分类号： G10H1/34
CPC分类号： G10H1/34 , G10H1/346 , G10H2220/265
摘要： A key guide structure for a keyboard instrument, which is capable of stably and appropriately guiding a key pivotally moved by key depression without generating noise. The key guide structure has guide holders each erected below a guide recess of each key, and guide members mounted to tops of the guide holders, respectively, each for sliding contact with lateral inner side surfaces of the recess. Each guide member includes a body disposed between the lateral inner side surfaces of the recess with a predetermined clearance, two lateral flexible portions laterally flexible and extending from lateral ends of a front or rear surface of the body in a manner protruding in a front-rear direction, and two lateral contact portions which are provided at front ends of the flexible portions in a manner protruding sideward and are in contact with the lateral inner side surfaces of the recess.
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