专利检索_ .膨胀室;加重音的装置专利检索_ .膨胀室;加重音的装置专利检索查询

序号	专利名	申请号	申请日	公开（公告）号	公开（公告）日	发明人
1	Swell expression engine	US66147433	1933-03-18	US2072844A	1937-03-09	AUSTIN JOHN T

2	Swell shutter	US34482529	1929-03-06	US1770260A	1930-07-08	AUSTIN BASIL G

3	Piano action	US29227728	1928-07-12	US1729528A	1929-09-24	TODD HAROLD B

4	Piano-bridle-strap fastener	US1729725	1925-03-21	US1685001A	1928-09-18	JEFFERSON MALCOLM THOMAS

5	Shutter for sound-proof boxes.	US1910575630	1910-08-05	US1110441A	1914-09-15	HOPE-JONES ROBERT

6	Electropneumatic swell-pedal action for pipe-organs.	US1911648547	1911-09-09	US1076069A	1913-10-21	SKINNER ERNEST M

7	Autopneumatic organ.	US1913740276	1913-01-06	US1070739A	1913-08-19	RUSSELL CHARLES C

8	Automatic playing apparatus.	US1034520D		US1034520A	1912-08-06	SCHWERTNER JOSEPH

9	Mechanical musical instrument.	US1903161261	1903-06-13	US984257A	1911-02-14	BALL HENRY PRICE

10	Musical instrument	US614886D		US614886A	1898-11-29

11	Pneumatic musical instrument	US576032D		US576032A	1897-01-26

12	Mechanical musical instrument	US563415D		US563415A	1896-07-07

13	parker	US368164D		US368164A	1887-08-09

14	Heeve d	US361562D		US361562A	1887-04-19

15	Merritt g ally	US351173D		US351173A	1886-10-19

16	Pneumatic action for organs	US271606D		US271606A	1883-02-06

17	Improvement in mechanical musical instruments	US213442D		US213442A	1879-03-18

18	Improvement in swells for pipe-organs	US133531D		US133531A	1872-12-03

19	Electronically controlled swell shutter operator for pipe organs	US189999	1980-09-23	US4361069A	1982-11-30	Richard H. Peterson; James A. Mornar
An electronically controlled swell shutter operator for pipe organs includes an electric motor driving a speed reducer whose output is connected to move the shutters of a pipe organ swell chamber, in order to control the volume of sound heard by the listeners. A swell pedal controlled by the organ player operates a first potentiometer and establishes a first voltage of a given polarity, the magnitude of which represents the exact position that the shutters should be in. The output of the speed reducer operates a second potentiometer which establishes a second voltage of a polarity opposite to that of the swell pedal potentiometer, the magnitude of this second voltage being dependent on the position of the swell shutters. A system of integrated circuit comparators compares the above-mentioned first and second voltages to produce an error signal. A logic system responds to the comparison result to cause the shutters to move in a desired direction and at a suitable speed to reduce the error and to achieve a balance, whereby the swell shutters assume a position corresponding to the position of the swell pedal. Dynamic braking and a system of automatically adjustable dead bands prevents overshoot and hunting.
20	Vibrato producing means for musical instruments	US55522144	1944-09-22	US2412212A	1946-12-10	GERLAT ERVING F

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