US1634927A - Percussive device - Google Patents

Description

July 5, 192 7.

A. I. WOODRING PERCUSSIVE DEVICE Filed Feb. 15, 1926 Inventor. A. W00d7"ir?g, 5g

Patented July 5, 1927.

I UNITED STATES PATENT OFFICE- SAFETY DE- VICES COMPANY, OF WATERLOO, IOWA.

PERCUSSIVE DEVICE.

Application fiIed'February 13, 1926. Serial No. 88,143.

My invention relates to improvements in percussive devlces, and the object. of my 1111- provement is to supply a simple, easily con' without departing from the spirit of the in vention.

In said drawings, Fig 1 is a full sized View of my percussive device, includingits manually and resiliently controlled. operating valve, parts being shown in side elevation and parts in medial vertical longitudinal section or broken away, the dotted lines in-' dicat-inga changed operative position of the percussor. Fig. 2 is a. plan view of the percussive device alone, the full and dotted outlines of the percussor indicating opposite limits of travel thereof with relation to the periphery of an apposed gong.

The device is particularly appropriate for employment as a sounding warning signal upon a vehicle, such as'a street-car or the like, and is intended and designed for using compressed air or other fluid under pressure for its motive power. I

The percussive device comprises a hollow cylinder I which is open at one end and closed at the other, but the closed end has a relatively small inlet-port 5 in the cylinder boss 4, ,and which communicates with a threaded socket of larger bore 6 in said boss, the latter receiving a threaded nipple 7 from an elbow-coupling 8 which communicates with a pipe 9, and the latter by an elbow coupling 10, pipe 11 and: threaded nipple 12' communicates with a supply-port or passage 36 leading from a central chamber 35 in a valve chamber 27. I

The operating valve-chamber 27, while included in the combination of thisinvention,

is not specifically claimed or particularly described herein, being otherwise patented in my United States Patent No. 1,511,554 of October 14, 192-1.

The cylinder 1 has and is supported de pendingly upon hangers 2 from any support. A cup-shaped plunger '13 is fitted within and to reciprocate within the interior hollow 30f the cylinder 1, and has a front closing wall 17 for the open end of the cylinder with an annular stop 18 which at one limit of reciprocation contacts with thefront end of the cylinder. This annular end part 18 terminates in a frustal part 19 which serves as an interior centering member for one end of a coiled compression spring21 which is mounted around a diminished hammer part 20 and engaged between said annular part 18 and the inner wall of a U-shaped bracketnnember 22, whose end parts embrace opposite sides of the cylinder body in fitting flattened bosses 25 thereon and is secured by set-screws 24. The hammer part 20 traverses a bearing-aperture 23 in the cross-part oft-he member 22 to project therebeyondtoward and ordinarily spaced from the edge ofa resonant gong 26. The interspace is such, that at its outer, limit of reciprocation, the hammer 20 contacts impactingly with said gong.

A number of radial holes 14 are made in the plunger wall 13 about midway of its length to the central hollow 16 of the plunger and terminate outwardly in a shallow annular groove 15 around the plunger at that location, and a narrow seepage passage 45- 16.

Referring now to the operating valvechamber 27, it has a passage 28, interiorly threaded, for communication with some conduit to a supply of air or other suitable fluid under compression but not shown. In the lower part of the valve-chamber is a lower against the lower part of the latter tending to keep the valve 31 closed. The upper part of the valve-body which traverses said passage 34 terminates upwardly in a short finger-or'boss 37 which when in its upper position is spaced'from the lower end of the loo bore 39- of a plunger 40whosenpper part is seated in a bearing opening in the upper part of the valve-chamber to project outwardly therefrom, the bore 39 turning laterally into communication with the atmosphere when the plunger is up. A pair of arched standards ll. have a pintle on which is pivoted a pedal sl t which has its lower edge shaped as a cam it to contact with the plunger Flt-l.

To ring the gong 26, the pedal 4:3 deprea ed with the plunger il which pushes down the valve parts 237 231, and compressed air passes through the chamber 35 and conduit 9 to the cylinder 1. The plunger 13 is pushed outwardly to expose the annularly connected ports 14, while the spring 21 is comtircssed, and the hammer 2t rings the gong .26. The air escapes more rapidly through the ports l-l. than it enters through the inlet l, so that the cylinder is immediately emptied ot air to about atmospheric pres sure. The quick escape of the cylinder air through the ports 1st is expedited by the use ol the eircunt'tercntial groove it), as the ad vancing edge of the latter opens the groove all around at once with a wide delivery opening for the ports ll, which could not occur without some delay were the groove omitted. for in the latter case but a small area of each port would be opened instantly, the response of the plunger in reversing being delayed. The spring 21 returns the plunger closing the ports I l.

The narrow grooves do a n in the plunger 13 and its fillet 18 are provided to permit a slight seepage of air from the cylinder and is useful in case of a small leakage of air hrough the operating valve, n'evenling the building up in the cylinder oi air prc sure from such leakage between outward reciprocations or when the valve or any other type ol operating valve is leaky.

In the valve-chamber 27, the plunger eltl has an annular flange and between this l'lange and the bottom of the chamber 35 is mounted a coiled spring which, when the pedal L3 is released. lifts the plunge and by the bore 39 exhausts the air from the chan'iber 35. so that the lower spring 312 may return the valve 31 to its seat.

It should be noted, that no portion oi the outer atmosphere can enter the cylinder 1, becaure the ports 1-lcan pass only com pressed air from the cylinder out throtuzh the plunger, tor the quick closing of the ports on the return stroke prevents admission oi the outer air and thus no atmo pheric dust can pass into the cylinder as in some other kinds of like devices. to toul the cyl-v inder and gradually render it inoperative.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In a device of the character described, a cylinder having an open and a closed end,

nee r927 the latter having a relatively small inlet port in controlled communication with a source ol fluid under pressure, a cupshaped plunger titted within and to recipro ate in said cylinder and having an outer striket stem, a compression spring anchored to resiliently engage the outer end of said plunger, said plunger having a medial groove around it and having holes leading from said groove to the interior of the plunger, the open end of the plunger being in communication with the cavity oil the cylinder, said groove filling with fluid under compression to exhaust the tluid quickly when the groove is uncovered in the outward movement of the plunger, the spring reacting to return the plunger to close said groove upon partial exhaustion of the fluid under compression in the cylinder cavity, whereby the spring is kept in partial compression during the reciprocations of the plunger, and the reeiprocations of the plunger are limited in their length to approximately the width of said groove to produce rapid blows by the said striker stem upon a resonant device.

In a device of the character described, a cylinder having an open and a closed end, the latter having a relatively small inlet: port in controlled communication with a source of lluid under pressure, a cup-shaped plunger titted within and to reciprocate in said cylindcr and having an outer striker stem, a eon1- pression spring anchored to resiliently engage the outer end of the plunger, said plunger having a medial groove around it and having holes leading from said groove to the interior of the plunger, the open end of the plunger being in coinnniinication With the cavity of the cylinder and the plunger having a minute longitudinal groove leading from said medial groove outwardly for con stant communication with the atmosphere, said medial groove filling with fluid under compression to exhaust the fluid quickly when the groove is uncovered in the outward niovei'ncnt of the plunger, the spring reacting to return the plunger to close said groove upon partial exhaustion oi? the fluid under compression in the cylinder cavity, whereby the spring is kept under partial COYHPIGS- siou during the reciprocations of the plunger, and the reciproeationa of the plunger are limited in their length to t 'avel approxh mately the width of said groove in opening and closing it, to thereby produce rapid blows by the striker stem upon a resonant device.

In testimony whereof I aflix my signaturc.

ALBERTO I. VVOODRING.

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