US1890212A

US1890212A - Whistle and the like

Info

Publication number: US1890212A
Application number: US606138A
Authority: US
Inventors: Arthur L Bridgham
Original assignee: CHARLES H SHERBURNE
Current assignee: CHARLES H SHERBURNE
Priority date: 1932-04-19
Filing date: 1932-04-19
Publication date: 1932-12-06
Anticipated expiration: 1949-12-06

Description

Dec. 6, 1932'. A. l.. smoel-IAM WHISTLE AND THE LIKE Filed April 19. 1932 q MQW MQW.. v AT-FERNE Patented Dec. 6, 1932 UNITED STATES PATENT GFFICE ARTHUR L. BRIDGHAM, F BOSTON, MASSACHUSETTS, ASSIGNOR T0 CHARLES H.' SHERBURNE, OF BOSTON, MASSACHUSETTS WHISTLE AND THE LIKE Application :filed April 19,

The invention relates to an improvement in whistles or like instruments in which sound is produced by the vibration of a contained column or body of air and which vibration is generated by the application of a gaseous fluid such as air or steam under what may be termed a sounding pressure.

The object of the invention is to provide means whereby a proper sounding` pressure l0 upon the instrument may be obtained with a very small amount of air or steam relatively to the size of the instrument.

The invention can best be seen and understood by reference to the drawing in which an embodiment thereof is shown applied to a whistle, and in which- Figure 1 is a front elevation of the whistle.

Fig. 2 is a cross section on the line 2-2 of Fig. 1, and

Fig. 3 shows partly in vertical cross section and partly in front elevation a slightly modified form of the whistle applied to a valve casing incidental to: an air brake system, in connection with which a whistle is commonly employed.

Referring to the drawing 1 represents the body of the whistle preterably tubular in form. The top end of said body is closed by a snugly tting block 2.

The opposite or lower end of the body 1 is leit open. Arranged opposite this end and separated therefrom by a suitable air space 3 is a casing 4 preferably tubular in form the same as the body 1. Contained within this casing is a block 5 which is joined to the block 2 by a connecting rod 6. The two blocks and connecting rod are preferably integral. The lower end portion 7 of the block 5 tits snugly within the casing while the upper end portion S thereof is of less diameter than the interior of the casing leaving between it and the casing an annular space 9 which communicates with the air space 3 and opposite end of the body 1 by way of an annular port 10.

Communicating with the annular space 9 are intersecting cross passages 11 extending through the block 5. Entrance is had to these passages by way of a passage 12 which extends through a bushing 13 screw-threaded to fit within the lower end portion 7 of the 1932. Serial No. 606,138.

blocl; 5. The bushing 13 is lborne by an inject-or block 14. Extending laterally through this block is a passage 15 connecting at its ends with the outer air. Screw-threaded to t within the lower end portion of the block 1e is a nozzle 16 with tip preferably contained within the passage 15 below the entrance to the passage 12, the passage 17 thro-ugh the nozzle being in alignment with the passage 12. The nozzle is borne by a block 18 of which it forms preferably an integral part. This block is interiorly threaded to receive a connection (not shown) from any suitable source of gaseous pressure.

The operation is as follows: Gaseous pressure induced to pass through the nozzle will induce a iow ot' atmospheric air entering by way of the passage 15 to flow upwardly through the passage 12 into the passages 11 and space 9 forming a compression chamber, and thence through the port 10 across the air space 3 to impinge upon the end of the body 1 :tor vibrating the air column within it.

In as far as the objective result is concerned the operation is the same as in the case of an ordinary whistle or similar instrument such as an organ pipe. T he means for accomplishing the objective result, is, however, diiierent in the sense that an iniiow of atmospheric air is caused by the operation of the injector to constitute the essential sounding pressure upon the body of the instrument. rlhis can perhaps be better appreciated by a consideration of the fact that if the amount oi' air or steam under pressure induced to 85 pass through the nozzle was alone relied upon and all atmospheric air shut off, the sounding pressure on the body of the instrument would be entirely inadequate and no appreciable sound, if any, would result. Under the same conditions, however, with the same amount of air or steam passing through the nozzle, it then atmospheric air is admitted the sounding pressure upon the instrument will be entirely adequate to provide sound of great volume and intensity.

lith a whistle of about the vsame general size as that shown in the drawing and with an opening through the nozzlel of one sixteenth of an inch and under an entering pressimilar instrument with as little applied pressure as possible. An instance of such is an air brake system having a whistle and where there is great need of conserving the-air in the system and dissipating it as little as possible when the Whistle is blown. The result has been the use ofV a very wealr whistle for the reason that so little air could be used. IVith a less amount of air than ordinarily used for blowing the whistle in an air brake system one is enabled by admittingr an inflow of atmospheric air to obtain a sounding pressure suiicient to provide'a whistle .that can be heard at a very'long distance, and will lmeet all demands brought to bear upon it.

An example of the application of the present invention to the brake system is shown in Fig. 3. Here for purposes of expediency the whistle is made a little different frointhe rwhistle shown in Figs. l and 2 although the pressure obtained from air within the brake system. The same casing is retained, and mounted upon this casing to form practically an integral part thereof is the block 20 bearing the injector nozzle 21. Screw-threaded `to iit upon the base of the nozzle is the injector block 22 and upon this block the body 28 of the whistle is mounted, the block fitting snugly within the lower end of said body. 24 represents the entering passage for atmospheric air, the passage extending through the block 22 and that portion of the body of the whistle within which the block fits. The outer or top end of the body of the whistle is open. s

Arranged above this end and'separated from .it by a suitable air space 25 is a casing 26.

Contained within this casing is a block 27 Y which is joined to the injector'block 22 by a connecting rod 28. The upper end portion of the block 2T lits snugly within the casing. AThe lower portion thereof is of less diameter than `the interior of the casing leaving be- Even tween it and the casing an annular space 29 which communicates with the air space 25 and end of the body 23 by Way of an annular port 30. Communicating with the annular space 28 are intersecting cross passages 31, extending through the block 27. Entrance is had to these passages by way of a passage 32 which extends through the rod 28 from the chamber of the injector block 22 where atmospheric air is admitted.

The construction is substantially the same as-irst described, although the arrangement is quite different especially in the fact that the entering air passing through the rod 28 is at a point some little distance removed from the point where the soundingvpressure is ap- A plied to the body ofthe instrument. The operation is the same as before. Pressure in duced to pass through the nozzle will cause a iiow of' atmospheric-air'- entering by way of the passage 24. to flow upwardly by way of the passage 32 into the passages 8l and space 29 and thence through the port 30 across the air space25 to impinge upon the end of the body 23 for vibrating the air column within it. Ilavingthus fully described my invention, I claim and desire to secure by Letters Patent of the United States l In an instrument of the type specified, in

combination, spaced. casing portions, one of :1li

said casing portions having an air chamber, the other of said casing portions having an opening to the atmosphere and a compression chamber, said other casing portion having a passage connecting said opening and 1@- compression chamber, and anozzle adapted to direct fluid under pressure into said passage and cause air to be drawn through said opening int-o said passage, said other casing portion having means for directing iuid unjf-l der pressure from said compression'chamber toward said air chamber.

ARTHUR L. BRIDGHAM.l