US879190A - Sound-producing device. - Google Patents

Description

No. $79,190. Mmmm? im., w. um. J. Y. NQRTHEY. SOUND PRQDUGING Umm.,

APPLIUATIH FILED DBG. 2. 1995.

JOHN PELL NOETHEY, OF TORONTO, ONTARIO, CANADA.

SOUND-PRODUCING DEVICE.

Specification of Letters Patent..

.Patented Feb. 1e, 190s.

Application 'led December 2, 1905. Serial No. 290037.

To 'all whom it may concern: Be it known thatI, JOHN Prem. Nonrnnr, of the city ol' Toronto, in the countyof York, in the Province of Ontario, Canada, lavcigi; vented certain new and useful Improvements in Sound-ProducingDevices Suitable Jfor Sirens and Like Instruments, of which the following is the specification. e

My 'invention relates to improvements in sound producing devices suitable for sirens or like fog signaling or position locating der vices of the character having a cylinder with sound producing oriiices and an annular enlargement and a cover, and also a reciprocating piston having sound producing ori frees as shown for example in my Patent #736428 ot Aug. 18/03, and the object of. the

. present invention is to provide ia simple means for keeping separate the sound producing air from the air which eiiects the reciprocationy of the piston whereby a Apurer note is produced and further to produce at the end of each stroke 'of v'the piston, a cushioning eil'ect to limit the stroke of the piston which objects are attained in the present instance by a particular arrangement of the ports and passages and by providing separate inlets and outlets .for the sound producing air and for the in'ipelling air, in a manner clearly set forth hereafter and illustrated in the accompanying drawings in whichr Figure l, is a sectional elevation of a sound producing device or engine containing my improvements. tional detail. Fig. 3, is a pers ective detail showing the form of the annu ar ports and their communication .with the openings or holes in the peripheryand face of the enlargement oi the cylinder.

In the drawings like letters of referenceindicate correspondingr parts in each figure?` A .1s a casing having an entrance Afor the sound producmg air and the entrance A2 tpl' the irnpelling air.

` B is the cylinder having the annular enlargement B.

C is a piston having a head C and D is a cover, which is securely held in the casing and abuts one end thereof' and the end or face of oriiices B2, which are designed to c oa'ct with Fig. 2, Vis an enlarged secs the orifices C3 to produce thesound. The casing A is provided with an annular cham communicate. l kB'are apluralitygo radial holes extending annular enlargement B` B3 are a series oi holes formed in the an nular enlargement parallel to the axis ofthe cylinder.

2 is an annular port located in the annular enlargement and ,communicating with the mote from the end inner face of thelannular enlargements B.

3"is an annular `port in the annular en largement communicating with the holes B3. The annular port 3 is located at apoint slightly remote from the cover.

4 and 5 are annular orts in the internal periphery of the annu ar enlargement B., such ports communicating with the holes B3.

.6 and 7 are ports in the piston head, the port 7 being outside of the hollow portion and the port 6 communicating with the intcrior. l

it will be noticed that the cover D is provided with an opening D surrounded at the interior by an inwardly extending flange D2 and it will also be noted that the piston head C is provided with a flanged opening C4, which encircles the flange Dand has an easy i'it thereon.

The impelling air passes through the holes B'4 annular'ports 2 into the interior of the cylinder, thereby driving the piston towards the cover, thence through the ports 7 a'nd 5 next the'cover where the force oi the air causes the piston to pass away from the "cover the port` 6 of the piston comes opposite passes ont into the interior of the head of the piston and throughthe opening D. thus he seen that the exhaust air is sepa-` rated and diverted in my improvement away from'tle`sound producing air, which. is anv im@` portant desideraturn, the object being to obtain a pure note which will travel a much a note produced by air with which the "exhaust ofthe impelling air was permitted "to mix, since in the latter ease experiments show that the air waves would be disturbed on account ofthe exhaust, opening at a dit ber A3 with which the entrance orifices A? lholes 'Bl and locatedet a point slightly recover. As the plston passes away from the the YYporte and consequently the exhaust inwardly from the external periphery lof the and holes B to the annular port 3 to a point it will .v

greater distance than would be the case with Al sound producing device for sirens and like instruments'comprising acylinder with sound produving orifices and an annular enfor the c xjlinder, and n re- I largement, a cover ciproeating piston hr1-ving sound producing' i orlhes, sind Cyhnder and piston having Cop- 5 @rating ports for admitting and exhausting i the nir which effects the reciprocntion of the i piston, and means for separating: suid'ports froni the orilices which admit the nir that I produces the sound whereby the lutter is unaffected in its quality, substantiall \v as deg scribed.

JOH\T PELL NORTIIEY.

Witnesses:

B. Born, E. MCEACHENN.

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