Untitled record

Application filed October 7,1892. Serial No. 448,100. (No model.;

To all whom it may concern;

Be it known that I, Sidney P. Hasey, a citizen of the United States, and a resident of New York, in the county of New York and 5 State of New York, have invented a certain new and. useful Improved Pneumatic Alarm Device, of which the following is a specification.

My invention relates to improved devices io for giving alarms or sounding calls: in other tvords, improvements in devices known as alarm or call gongs or bells; and the special feature of my invention consists in the fact that it is adapted to be operated by pneu15 matic pressure. Heretofore such apparatus so far as I am aware have been operated by electricity, by hand or by clock work. I am aware, however, that there have been attempts made to operate alarms by pneumatic appa20 ratus, but so far as I am informed there has never been any practically operative device of this class made.

By my invention I combine mechanical elements in such manner that air under press25 ure acts automatically to reciprocate a piston or pair of pistons, as the case may be, to the rod of which the hammer or striking device whatever it may be is attached or engaged, and my apparatus is so constructed that it is 30 practically indestructible as much so I mean as any piece of mechanism of this class can be and it is exceedingly sure in operation. In these respects my apparatus is as I think much more desirable because it is entirely 35 free from electrical connections, springs, clock work, and all the other features of the old forms which being exceedingly liable to get out of order, injuriously affected the durability and the accuracy and durability of op40 eration of the device.

In the drawings hereof, Figure 1, illustrates an elevation partly in section of the invention. Fig. 2, is a like view showing the parts in their reciprocated positions. Fig. 3, is a plan 45 partly in section on the line x, x, of Fig. 1, taken on the line of the arrows. Fig. 4, is an elevation partly in section of an alternative construction. Fig. 5, is an elevation, the gong only being in section, viewed from the left 50 as shown by the arrows in Fig. 4. Fig. 6. is an elevation taken from the right of Fig. 4. Fig. 7. is a cross-section taken on the line Y,

Y, of Fig. 4, and in the direction of the arrows. Fig. 8, is an elevation of a modified construction. .55

Referring first to Figs. 1, 2 and 3,—A is a base preferably of metal, whereby the apparatus may be screwed or otherwise fastened to a wall or other suitable support. B is a standard fastened to the base and which sup- 60 ports the gong C. by screw D or other suitable means as already well understood. E is the air inlet pipe, it connects with any suitable reservoir of compressed air, or its equivalent, gas of any kind or any expansive fluid 65 may be used. In fact water may be employed instead of air, although I prefer air as indicated by the words pneumatic alarm device. F is a castingcomprising two cylinders Gand Η. 1,1' are pistons moving through the cyl- 70 inders; they are composed of three sections; an upper section J, J', a middle section, K, K' and a lower section L, 1/. They being connected by the piston rods K² as shown. L²are extensions of the piston rods which pro- 75 ject through the ends of the cylinders as usual and may be provided with such stuffingboxes as desired, although ordinarily none will be necessary, especially for pneumatic apparatus. Μ, M' are two links pivoted at 80 one end to the easting F as shown, and at the other end they are respectively pivoted to short arms N and N^z of the hammers O, O'. P, P' are the hammers on the ends of the hammer arms O and O'. The sections of the pis· 85 tons J, K and L and J', K' and L' are separated by two chambers Q and Q' and R and R', and these chambers and also the spaces at each end of the pistons between them and the ends of the cylinders are connected by 90 certain ports which it will be more convenient to describe during the explanation of the operation of the device.

The operation of the apparatus as thus far explained isasfollows:—The air or other fluid 95 enters the pipe E, the parts being in the position shown in Fig. 1. It enters first the compartment Q' of the left hand cylinder. It then passes through the unoccupied space between the sections of the pistons J'and K' 100 and passes through a port a into the space Q in the right hand cylinder. Then it passes through the port b up into the space between the section J' of the left hand piston and the s

493,365 the hammers actuated by them are caused to act rapidlj⁷ and forcibly upon the gong C and it will be observed also that in my apparatus 7 3 the most simple mechanical parts are employed. There is no great nicety in the.construction and they are free from springs, electrical connections, clock work, or any other sensitive or easily deranged mechani- 75 cal features.

In Figs. 4, 5, 6 and 7,1 show a modified.construction of my apparatus in which a single hammer only is used, and. which is. not only considerably less expensive, but is also or 80 may be more compact than the form shown in Figs. 1, 2 and 3. In these figures, i. e. 4, 5, 6 and 7, A is the base piece, Bis the post, C is the gong and E is the inlet pipe. All of these parts are or may be the same as those referred 85 to in the preceding figures and consequently are given the same letters, a' is a casting attached in any suitable manner to the base A, in it are two cylinders b' and c'.

d' e'f' and g' are all of them ports through 90 which the fluid passes and h' and i' are two exhaust ports;./ is the piston rod for the left hand piston which alone actuates the hammer, Id, which is attached to the hammer arm V which is in turn attached to a pivoted or 95 rocking lever or arm m’ it being pivoted, at n' to a post on the frame the free end of which engages with the piston j', bj⁷ ordinary rolling joint, there being a head o' on the arm m which rolls or slides between the end of the 100 piston p’ and a head or disk q' on the end of the piston rod j'. r' is a stop which determines the movement of the piston ,7 _ outwardly and s' is another stop which determines the movement of the other piston t up- 105

I wardly. u’ is a projecting piece on the base I a! to which a piece of metal v' is screwed as by bolt or screw w', and at the other end of it a bolt or screw x' passes down through it, the stem of the screw x' acting as a pivot no 71' of the rocking arm m'.

The operation of this modified form of the invention is as follows. The fluid enters the pipe E in the same manner as in the apparatus heretofore described; it passes through 115 the port e' but making no connections results in nothing. It also passes through the port d' through the vacant space b', through the port/' beneath the right hand piston t' and lifts that piston, the upper end whereof is ar- 12c rested bv the stop s', but in the shifted position of the right hand piston, the vacant space c' comes coincident with both of the ports g' and e', consequently the fluid passing through the vacant space c' and the port g’ exerts 125 pressure on the top of the upper portion of the left hand piston p' whereby that piston is depressed, the rocking arm m' is rotated and the hammer carried against the gong or bell. Also entrance of the fluids through the port 130 d' is cut off by the descent of the left hand piston, and the port i' is exposed by reason of the vacant space V coinciding with the exhaust port i' and with the port /'. Conseencl of the left hand cylinder. It also passes through a port c into the space between the section L of the right hand piston and the end of the right hand cylinder. It will thus 5 be seen that there is pressure above the section J in the piston in the left hand cylinder and also in the unoccupied space Q in the right hand cylinder and below the section L of the right hand cylinder, but the left hand io piston cannot move since it is already at the end of its down stroke, also the pressure in the section Q nullifies itself against the opposing faces of the sections J and L·. of that piston, but the pressure below the section L 15 of the right hand piston does exert moving power upon that piston and it is lifted; thereby drawing the right hand hammer inwardly as shown in Fig. 2. As soon as the right hand piston reaches the limit of its up stroke, then 20 the section K of that piston has traversed from the underside to the upperside of the admission port a and the exhaust port e in the right hand cylinder is exposed, consequently the fluid which was above the section 25 J' of the left hand cylinder can now return through the port b, the unoccupied space Q and out at the exhaust port e. Meantime the fluid under pressure has now entered the vacant space R between the opposing faces of the sections K and L of the right hand piston, and from that space passes through a port f into the space between the section L' of the left hand piston and the end of that cylinder, and since the pressure in the cylinder above 35 the section J' of the left hand piston has as stated been removed, consequently the left hand piston is in turn lifted which draws in the left hand hammer P' in the same manner that the hammer P had previously been drawn 40 in. During the described movement of the left hand piston, the section K' of it is transferred to the other side of the inlet port from the pipe E, consequently the fluid entering the unoccupied space R' of the left hand pis45 ton, passes through the admission port a into the right hand cylinder the same as before, and it also passes through a port g which connects the space R' with the space above the section J of the right hand piston. Conse50 quently there is pressure applied above the right hand piston the pressure between the sections K and L of that piston escaping through the exhaust port h. Thus the parts are returned to their original position. i,j 55 are two exhaust ports for the left hand cylinder which coincide in location and function with the exhaust ports e and h of the right hand cylinder which have already been described.

From the foregoing it will be seen that by the simple admission at one point, that is to say at the end of the tube E of any suitable fluid under pressure, the pistons are caused to automatically admit, cut off and exhaust 05 the fluid into their respective cylinders in such manner as to effect a very rapid reciprocation of the two pistons whereby of course,

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3J fluently the pressure under the lower section of the right hand piston t' being released through the exhaust i', the right hand piston drops by action of gravity, returning that pis5 ton to its normal position and exposing the exhaust port 7/, whereupon pressure on the upper section p' of the left hand piston is in turn released through the exhaust 7i', and the weight of the hammer, in other words gravity, io again lifts the left hand piston p' returning it to its normal or initial position; thus securing a reciprocation of the parts.

It will be seen that this form of my invention is even more simple than that already 15 described, and that its continued bperation, its accuracy and reliability is as well assured as anything well can be in devices of this construction, and I wish here to state that the parts composing my apparatus should be 20 made of suitable material, i. e. materials which are not liable to atmospheric or other action of a kind calculated to interfere with their continued operation; that is to say, brass or copper are very good materials but hard rub25 ber or aluminium or Babbitt metal will in certain places be superior.

In .Fig.. 8,1 show still another form of my invention, in which the ends of the pistons themselves act as the hammers, which strike 30 against the gong. In this case, as in the others, A is the base plate, B is the post upon which the gong C is supported by a screw or other suitable device which enters a threaded hole D. in the post B. a² is the casting in 35 which there are two cylinders having ports which may be substantially the same as that shown in Fig. 1. That is to say, b² and c² are the connecting ports and cZ²and e² are the inletports. E is the main inlet pipe correspond40 ing to the pipe E in the other figures. /² and g² are the two pistons upon the ends of which are two heads or strikers h², i². The piston rods respectively pass through a guide / which steadies and supports them. The 45 heads h² and i² being reciprocated as before described, alternately strike the gong C.

It will be apparent to those who are familiar with this art that various modifications may be made in the details of construction of my apparatus, and still the essential features of 50 my invention be embodied. I therefore do not limit myself to the exact details.