US1157398A - Pneumatic action. - Google Patents

Description

C. I. JOHNSON. FNEUMATIC ACTION. I APPLICATION FILED IAN.24l |914. 1,157,398. Patented 001.1111915.

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C. J. JOHNSON.

PNEUMATIC ACTION.. APPLICATION FILED IAN.24. I9I4.

Patented Oct. 915.

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CHARLES J. JGHNSON, GF CT-CLCTC,

PNEUMLTIC ATGN.

1,157,398 Specification of Letters Eats-nt.

Application filed anuary 555.-, 1314:. serial 11e.

To all 1li/tom t may concern.' against the top of the corresponding air Be it known that l, @Hann-ns J. lor-inscri, chamber by i eans of a plate 1S as india citizen of the United States, and a resident cated. arranged in board 1G inmiediately of the city of Chicago, county of Coolr, and in "iront of each of the chambers Ll is an in- 60 5 State of lllinois, have invented certain new termit'ent vacuum cnamcer 19 which is sepand useful Improvements in Pneumatic ricrated from chamber 8 by means of a flextions, of which the following is a specificaible diaphragm 20, each of the chambers 19 tion. being connected by a passage 21 in top board My invention relates to improvements in 13 with the flexible tube 22 leading to the 65 pneumatic actions especially adapted for usual tracker board of the player piano. use in player pianos and has for its object Arranged across he upper front portion of the provision of an improved construction board 1G is a bleeder vacuum chamber 23 of this character which is simple and etliwhich is in constant communication with cient in use. each of the chambers 19 through a minute 70 rlhe invention consists in the combinableeder opening 211. fr rod 25 is slidably tions and arangements of parts hereinafter mounted in a suitable bracket Q6 and condescribed and claimed. tacts with the corresponding diaphragm 2G The invention will be best understood by and the corresponding valve 15, so that inreference to the accompanying drawings ward movement of diaphragm 2G into cham- 75 20 forming a part of this specification, and in ber 8 will raise valve 11j from its seat and which swing valve 16 to its seat.

Figure 1 is a face view of a portion of the ln operation a vacuum is maintained in pneumatic action of a player piano shown each of the chambers 8 and Q3 in the usual with portions broken away and others in manner. l/hen air is admitted to any one 80 section, and Fig. 2 is a section taken on line of the chambers 19 through the correspondmof Fig. 1. ing tube 22 from the tracker board of the The preferred form of construction as piano, the vacuum normally maintained in illustrated in the drawings comprises a plusaid chamber 19 is wholly or partially derality of bellows 1, each having a movable stroyed and diaphragm 2O is drawn in- 85 side :2 connected. with a separate operating wardly in chamber S by the vacuum mainrod 3, each of the rods B being adapted to tained therein. rhis opens the correspondoperate one note of a piano tnot shown). ing valve 15 and closes the correspondingrlhe bellows 1 are preferably arranged in valve so that a vacuum is also formed in three rows, but connected to operate indethe corresponding chamber il causing col- 35 pendently of each other. An air chamber lapse of the bellows 1 and elevation of the 4e is arranged adjacent each of the bellows rod This upward movement of rod 3 1 and in open communication with the outis its operative stroke. l/Vhen the admisside atmosphere through a passage 6 and a sion of air through tube is discontinued,

port 7 as shown. A vacuum chamber 8 is the constant bleeding or passage of air 95 arranged across the front of the bellows 1 through minute opening 21 into chamber 2B ancL air chambers 4 and a port 9 leads from restablishes a vacuum in the corresponding chamber 8 into each of the air chamchamber 19 and as soon as the pressure in bers 4. The vacuum chamber 8 is formed chamber 19 falls below that of the outside rear board 11 which are spaced apart at the on valve 1G combined with gravity will open bottom by means, of astrip 12 and are said valve 1G and close valve 15 thus resecured together at the top by means of a storing the parts to original normal conditop board 13. An angular valve head 'lil is tion.

arranged in each of the chambers and carrlhe arrangement disclosed is a simple and ries two valves 15 and 16, valve 15 being efficient one for the purpose, very compact arranged to hold the corresponding port 9 in form, is practically unaffected by changes normally closed and valve 1G being arin temperature and therefore is highly etliranged to close port l when valve head 14 cient in use.

swings to open port 9. Valve head 1-1 is lhilel have illustrated and described the 110 mounted upon a piece of flexible fabric 17, preferred form of construction for carrysuch as rubber cloth, and secured in place ing my invention into effect, this is capable in a space between a front board 10 and a atmosphere the pressure of the atmosphere 100.

of variation and modification without Vdeparting from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myseli2 of such variations and modifications as come within the scope of the appended claim.

Iavino Vdescribed m invention what I claim as new and desire to secure by Letters Patent is:

pneumatic action comprising` an air chamber having` ports in adjacent walls thereof; a swinging` valve head carrying two valves in iiXed relation to Veach other and Copies of this patent may be obtained for five cents each, by addressing the Commissioner controlling said ports, said valve head being supported by a flexible member secured to a wall of said air Chamber by means of a removable plate; and means Vfor swinging said valve head to cause said valves to oontrol said ports to e'eot operation of said pneumatic, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' CHAR-LES J. JOHNSON.

Witnesses:

JOSHUA R. H. PoTTs, ARTHUR A. OLSON.

of Patents.

Washington, D. C.

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