US1502984A - Percussion pump - Google Patents

Description

July 29, 1924. 1,502,984 R. ESNAULT-PELTERIE PERCUSSI 0N PUMF Filed Oct. 22, 1923 Y 5 Sheets-Sheet 2 ROBERT ESNAULT-PELTERIB mvsm'ron ru m c ATTORNEYQ.

Jufiy 29, 1924. 1,502,984

' R. ESNAULT-PELTERIE PERCUSS ION PUMP Filed Oct. 22 1923 5 Sheets-Sheet 3 5 m Ill 7 Roman": Emma-Panama,

INVENTOQ- July 29, 1924. r 1,502,984

R. ESNAULT-PELTERIE PERCUSS ION PUML Filed Oct-22', 1923 5 sheets-sheet 4 Ho an-r Bsmwn- PELTERIB INVBNTOR July 29, 1924. 1,s0 ,9s4 R- ESNAULT-PELTERIE PERCUSSION PUMP Filed Oct. 22. 1923 5 Sheets-Sheet 5 ROBERT ESNAULT- PELTERIE,

INVENTOR Patented July 29, 1924.

warren stares sezssa ROBERT ESNAUL T-PELTERIE, OF PARIS. FRANCE.

rnacnssron ruins.

Application filed October 22, 1923. Serial No. 669,932.

T 0 all whom it may concern:

Be it known that I, ROBERT ESNAULT- PELTERIE, a citizen of France, and a resident of Paris, France, have invented new and useful Improvements in Percussion Pumps, which is fully set forth in the following specification.

My invention relates to a percussion pump for liquids which is chiefly intended for the supply of fuel to internal combustion engines and more particularly for the supply of gasoline. In this type of pump, some difiiculties are to be overcome, for on the one hand itis necessary to provide for a very small cylinder full in a very regular manner in spite of great variations of speed, (the term cylinder-full being herein employed to designate the volume of liquid discharged at each stroke of the pump although in fact the latter has neither piston nor cylinder), and on the other hand it is required to obviate all gripping, for inasmuch as the gasoline possesses anti-lubricating properties, no friction (for instance between a cylinder and piston) can be allowed .within the liquid, while its great fluidity would make'it necessary toprovide for a very close adjustment of the parts and the use of tight packing.

In order to obviate these drawbacks, l dispense with the use of a cylinder with piston as the operative element of the pump and employ a percussion device which is so disposed as to strike against a stationary element at each stroke of the pump, for in stance by the action of a spring.

The following description and appended drawings which are given by way of example set forth the present invention.

Figs. 1 to 16 show various forms of the percussion element or striker and its stoppiece.

Fig. 17 is a sectional View pump wherein the striker is the one shown in Fig. 1.

Fig. 18 is a view one-half in section and one-half in elevation of a pumpof this con struction mounted in vertical position within thebody of the liquid to be pumped.

Fig. 19 represents a modification of the control. I

- Fig. 20 represents another modification of the same.

Fig. 21 shews a special arrangement for use upon aviation engines especially for of theentire analogous to those using a carburetter subjected to extra pressure by means of a turbo-compressor.

Fig. 22 relates to 'a modification com-- prising an elongated conduit.

Fig. 23 shews a modification comprising a chamber serving to obtain a regular output.

Fig. 24 is a general View of an improved form of the pump.

Fig. 24 is a view on a larger scale of the central portion of Fig. 24 with modifications.

Figs. 25, 26, 27, 28 are detail views of various constructional forms of an element which is hereinafter termed difiuser.

Figs. 29 and 30 show two improved forms of the reaction spring used with the ball or valve serving for the discharge.

The percussion element or striker a, Fig. 1, has a flat shape and is so disposed that at each stroke of the pump it will strike against a fixed element 7), for instance under the action of a spring. At the centre of the element b is formed the aperture 0 which is controlled by a ball or valve d urged by a spring 6 in such manner that when the striker disc (4 comes into contact with the surface I) the impact will not only expel a considerable part of the liquid outwardly of the striker but will also oblige a certain part of the liquid to lift the valve or ball d, the latter being then brought back upon its seat by the action ofthe spring 6.

The other figures from 2 to 16 indicate other forms of the striker and of its seat; the. said ball or valve and spring shown in Figsfl and 2 are not further illustrated, for the sake of simplicity.

In the constructional formof the apparatus shown in Fig.17, the valve d consists of a ball, and the striker a mounted upon the. rod 7 is impelled upon its seat by the spring 9 adapted to bear upon a nut with hemispherical boss 7L through the medium of the cap 2'; the other end of the said spring bears upon an adjustable end-piece At the end of the rod is mounted a fork is which is pivoted upon an axle Z disposed on the end of a rocker m pivoted on a stationary axle a and whose pointed end 0 co-operates with a cam 79 which is rotated by the shaft q in the direction of the arrow.

The gasoline is supplied from the fuel tank to the device through the tube 9 which should be suiiiciently large, and it enters the chamber 3. In order to prevent the liquid in the said chamber from entering the space occupied by the spring 9 (should this prove necessary) a bronze nut t forming a stuliing box compresses the plastic substance M which is of variable nature according to the fluid to be delivered by the pump. For gasoline, it will be advantageous to employ for this purpose a mass of tow impregnated with a paste consisting of a mixture of black soft soap (or a soap paste formed with water) and graphite, or preferably with a paste consisting of castor oil and graphite.

The rod 7" which is guided in the bronze nut t should not be subject to friction in the portion situated outwardly of the packing i. e. the part situated in the gasoline, and for this reason all the figures indicate a considerable play between the rod and the end a of the stufling box.

The spring a of the ball or valve d can be more or less compressed by means of a screwthreaded rod 7) controlled by the handwheel to and traversing a stuffing box 00 analogous to the preceding.

The said pump is operated in the following manner hen the shaft g rotates in the direction of the arrow, the inclined part of the cam 79 will lower the end 0 of the rocker m which by means of the axle Z will draw upon the fork is, the rod f and the striker a, thus compressing the spring 9 In these conditions, the liquid will evidently occupy a large space between the said striker and its seat 6.

lVhen the cam attains the position shown in Fig. 17, the end 0 of the rocker becomes free and the said rocker, which is thus released, will be acted upon by the spring 9, and the latter, operating through the medi um of the cap 2', the nut h and the rod 7, will impel the said striker upon its seat Z) with great force.

The major part of the liquid situated between the striker and its seat will thus be forced out into the chamber 8, but calculation and experiment show that the impact produces a suflicient pressure at the middle part of the liquid in order to expel a certain portion of the liquid into the aperture 0, so that the said liquid will raise the valve (Z and will enter the chamber y. After the said chamber is completely filled the liquid thus discharged will drive before it at each stroke a corresponding volume of liquid and the latter will issue through the conduit 2.

t is evident that, at each discharge stroke, the same speed will be imparted to the striker avby the said spring, and this irrespectively of the speed of rotation of the shaft 9, since the end 0 of the rocker as well as the corresponding portion of the said cam are formed with a sharp angle so as to provide for the abrupt dropping of the rocker. ln'these conditions the volume of liquid discharged at each stroke through the valve 63 will be theoretically independent of the speed of rotation of the cam shaft 9 and will depend solely upon the tension of the spring 9 and the total massmoved by the latter, and also upon the tension of the spring 0 of the valve d.

Experiments proved however that this condition of pendence cannot be obtained in all cases. For instance with the simple form shown in Fig. 1, the cylinder-full will increase with the speed of the cam shaft, ay in the proportion of 2 to 1, between 0 and 4000 revolutions per minute. But the cylinder-full will remain constant between these speeds if use is made of a striker having the shapes analogous to those indicated in Figs. i and 17. v

Shapes analogous to that of Fig. 6 will obviously afford intermediate results, i. e. an augmentation of the cylinder-full with increased speed of. the cam shaft, but to a less degree than with the flat striker.

A diminution of the cylinder-full for increasing speeds may be obtained with strikers as shown in Figs. 7, 8, 9, 10, 11, 12, provided the filling ofthe space between striker and seat shall be hindered when operating at high speeds, and for this purpose the cylindrical parts when at the end of the stroke are but little (or not) disengaged from one another in the lateral direction; however a slight diametral play must be allowed between these parts in order to prevent gripping.

Precautions must be taken in order that the chambers s or 3 shall not form acoustic resonators acting at certain speeds in accordance with the frequency of the pump, and to this end the chamber 7 is preferably filled upwith balls which will give a complex form to this space so as to break up the elastic waves; the diameter of the balls can only be determined by experiment for each particular case. Balls may also be employed in the space 8, provided the striker is surrounded by projections 8 which prevent all contact with such balls, Fig. Suitable metallic filling pieces of different shapes may also be employed in order to render this space non-syminetrical, and Fig. 21 indicates a filling piece 7 which consists of an obliquely cut ring.

Should the said pump be used for the engines of motor vehicles for elevating the gasoline from the tank to the carburetting apparatus, it is preferable to employ the arrangement shewn in Fig. 18 wherein the pump is vertically disposed upon the bottom of the fuel tank itself; the reference letters in Fig. 18 correspond to those of F 1'7, and no further description will be necessary, except that by reason of the total immersion of the de ice in the gasoline, the bronze bearing 2? is herein disposed between two packing members a and a analogous to the above described member at (Fig. 17) the whole being maintained by the nut In this manner, the hearing will always be supplied with castor oil and graphite.

It is observed inFig. 18 that the releasing mechanism has been still further sim' plified; the rocker is eliminated and the nut h co operates directly with the cam p mounted on the shaft g which is driven by the engine.

Some difliculty may be found in disposing the shaft '9 upon a motor vehicle, and for this reason it may be replaced by the arrangement shown in Fig. 19 wherein the end of the rocker m instead of being directly actuated by the release device, is controlled by means of steel wire, piano cord or cable a attached to a rocker arm 6 whose end 0 forms a pawl co-operating with a ratchet wheel or releasing cam d mounted upon any of the rotating parts of the engine, the number of teeth being exaggerated in the figure for greater clearness. But in this form of control device, the wire or cable a is subjected to the same abrupt motion as the striker, itself, and this may be prejudicial to its duration.

This drawback can be obviated by controlling the said wire or cable not by the ratchet teeth as in Fig. 19 but by a cam or link which imparts to the wire an alternate motion without jerks. In order to provide for the release action which is necessary for the operation of the pump, I may (Fig. 20) control by the wire or cable a and a fork p apertured at f, a rod 2' which is slidable in a stationary portion 9 of the main frame of the pump and is provided at the other end with an axle 72 having pivoted thereto the arm (Z which is urged at the outer end by an obliquely disposed spring 1. The arm d comprises a projection 72 co-operating with a like portion 0 of the rocker m and also a ramp 6 co-operating with the roller .9 mounted on the stationary axle F.

The operation of the said device is as follows:

In the position shown in Fig. 20, the said steel wire or cable and the part which it controls are indicated by the full lines repre senting the upper position into which these parts are brought by the said spring. As the said wire or cable descends,-it draws with it the slidable rod i and also the arm (Z which moves the end 0 of the rocker m hen the said ramp comes into contact with the said roller having afixed axle, the arm (Z will be moved away from the said rocker in its rotation upon the axle h, and at a given moment the projection 19 will release the end of the rocker 0 as shown in the broken lines, Fig. 20, thereby releasing the rocker m and the striker connected therewith as shown in Fig. 17.. This connection has been omitted in Fig. 20.

The whole of the sliding members may therefore descend as far as the end of the stroke under the action of the said wire whose movement is now terminated, and upon returning to the upper position, the inclined rear part of the projection 22 will gradually mount upon the inclined part of the end of the rocker 0 which has now resumed its position as shown in the full lines, until these portions of the two projections become disengaged and the latter now assumes the position shown in Fig. 2.0, by reason of the inclined position of the spring; the parts are now in position for the succeeding release movement, and so on.

Experiments proved that the said pump will operate even when the pressure in the chamber 8 becomes reduced to onetenth of an atmosphere, so that it is especially adapted for aeroplane use, for elevating fuel from the gasoline tank (which is at atmospheric pressure) to the carburetting apparatus, and chiefly when the aeroplane is flyingat very high altitudes and the carburetting apparatus is subjected to extra pressure by means of a turbo-compressor.

In these conditions, in order that the cylinder-full shall be independent of the inlet pressure of the pump, it is preferable that the pressure required for lifting the discharge valve cZ should be as uniform as possible. But in the arrangement Fig. 17 if the pressure in the chamber 3 is considered as constant, it is obvious that when the pressure is reduced in the chamber 8 the valve (Z will be urged upon its seat not only by the spring 6 but also by the excess of pressure in the space y compared to the pressure in the space 8.

To compensate this action, the spring 6, Fig. 21, acts no longer in a direct manner upon the valve d but through the medium of a rod 7 mounted upon a diaphragm g 4 analogous to the type employed in aneroid barometers, and the atmospheric pressure will act upon the left hand side of the diaphragm;

The cross-section of said diaphragm can be readily determined so that the excess of pressure in 3 over atmospheric pressure will diminish the action of the spring 6 upon the valve d according as the action of the pressure is 8* upon the valve becomes reduced.

Adjustment of the cylinder-full can be eifected by modifying the tension of the spring 9 or of the spring 6. For an increased tension of the spring 9 the cylinderfull will be greater, but an increased tension on the spring 6 will cause a diminution of the cylinder full. w l g In the arrangement shown in Fig. 23, the spring 9 acts directly or through the me dium of a ball-joint upon the striker itself, and this will have the advantage of reducresented in the vertical position so as to provide for the escape of air-bubbles to the top. In the modification shown in Fig. 24 (as I compared to Fig. 17) the spring 9 acting Ill) upon the striker a is now disposed within the full supply chamber .9, this arrangement serving to obviate the excessive stress upon the rod 7 due to the impact in the case in which the spring acts upon the said rod and not directly upon the striker.

To allow the axle Z to describe an arc of a circle as determined by the arm of the rocker m, the portion f of said rod which is adjacent the axle- Z is flattened so that this part will be more flexible.

During the impact, the rod 7 is to be freed not only from the effect of the inertia of the head of the spring but also from that of the said rocker, so that the axle Z, Fig. 24:, instead of being disposed within an aperture in the arm m of the rocker, is simply engaged at either endin corresponding notch in the arm, and hence during the in pact of the striker, the said rocker will continueto move in an independent manner until its pointed end m drops upon the lower portion 22 of the said cam (or otherwise until any desired part of the rocker comes against a suitable stop-piece).

It is observed by experiment that in this position of the spring, which is most advantageous as concerns the stresses upon the parts, a drawback may be incurred from the fact that the said spring might during its compression produce an effort which is greater on one side than on the other whereby a torsional effect is produced upon the rod f at the point of junction 2' with the head of the striker a, so that the latter would fall obliquely upon its seat 6.

To obviate any such unequal action. the spring is disposed. Fig. 2-l, between two Cardan joints 2 .2 each consisting of three rings, the two outer rings each having two knife-edges in diametral position and in line with one another; the middle ring has in like manner two recesses in diametral position and in line with one another upon each face, co-operatitng with the said knifeedges, the recesses on each face of the middle ring being disposed at right angles to those on the other face, in order to form a Cardan oint.

The portion of the conduit situated between the orifice c of the striker seat 6 and the discharge valve d performs a very important part in the obtainment of regularity in the amount of liquid discharged at each stroke irrespectively of the variablerotation of the shaft 9.

If for example this portion of the conduit should simply have the form of a long and narrow tube, it is found by experiment that by reason of the inertia of the column of liquid projected by the striker at each impact, the amount of liquid discharged at eachstroke will increase with the operating speed.

Should .it be desired to maintain a constant value for this amount in spite of variations in speed, it will be advantageous to F enlarge the said conduit so. that it will form a chamber wherein may be disposed one: or more elements whose aggregate will be. termed diffuser.

Fhe said elements are intendedto. annul by a braking or damping action the effects of the inertia of the liquid, andthis result. can be. obtained by three different methods which may be approximately grouped in. three principal classes, or may be. employed in combination:

1. Damping of the liquid. properly so. called upon large surfaces.

2. The stream of liquid is broken up by one or more successive sharp angles.

The liquid is caused to flow at high speed through one or more orifices followed by enlarged spaces wherein the speed becomes reduced; should a plurality of orifices be employed, these may be disposed in series, with an enlargedspace between each.

a. Combinations or modifications. of. said. means.

The elementsor diffusers for damping the. liquid pertaining to. the first class as above. mentioned may have theform of a. simple, cylinder, preferably with a roughened.sur.- face, which is centered at each .end .by'means. of three small studs, Fig. 25, allowing, an small space between the cylinden and theuio chamber in which it is mounted.

A very large friction surface may be ob tained by replacing the solid cylinder shewn in Fig. 25 by a coil of thin metallic strips which are either smooth or have: a raised surface.

The diffusers of the second class may be. formed with baflies of a simple character, Fig. 26, or of battles disposed. upon an apertured diametral partition, Fig. 27, orfur ther, of wire gauze in various arrangements.

A diffuser of the third class may be formed as indicated in F ig. 2%.

In order to form the orifice c of the striker seat, a diaphragm 00 is employed having a central aperture with sharp edges and the angle between the faces constitutin the sharp edge may be varied at will provided a. sufliciently sharp edge is maintained.

The said diaphragm may be held in place 1 (Fig. 2 by a removable member .having the form of a ring 3 which is traversed mid way upon its height and according to a diameter by a round pin a serving to break up the stream of fluid issuing from the diaphragm 00,- at the rear of the ring y and forwardly of the seat d? of the ball valve d may be disposed a second diaphragm 03 resembling a: or difiering therefrom either by the diameter of the aperture or by the angle between the faces forming the same. The whole device is maintained for instance by the seat d of the valve (Z, which may have the form of a nut. Vith this arrangement the diaphragms 0e and x may be renewed or may be replaced by others wherein diflerent diameters of aperture or a different angular disposition of the faces forming the sharp edges may be employed, thus obtaining-a very close adjustment for each particular case.

It is obvious that one might eliminate the second diaphragm m or the first-mentioned diaphragm 00 (while retaining 90 as desired, and the most advantageous arrangement is to be determined by experiment for each particular case.

The number of combinations and varied arrangements of the means for obtaining a regular output will be thus considerable. As shewn in Fig. 28, these may comprise for example a cylinder analogous to the one shewn in Fig. 25 disposed between two end caps or diaphragms separated from the flat ends of the cylinder by a very small space which is regulated for each particular case and which forms two throttling portions in the path of the liquid, or the device may comprise a plurality of cylinders of the kind shewn in Fig. 28 which are disposed in series and separated by a like number of caps or diaphragms, so as to augment the surface friction of the liquid as well as to increase the number of the breaking points for the stream, or in other cases, use may be made of a cylinder or of coiled strips disposed between two orifices formed in thin walls, or like dispositions can be adopted.

Obviously, the preceding description of the diffusers is in no wise of a limitative nature, but serves solely to indicate various forms of construction.

I have made experiments with numerous forms of this device, but it will be evidently impossible to enumerate the whole of these forms in detail, it being obvious that the invention comprises all devices which are 'capable of damping the liquid stream (as above indicated) by. friction or by the successive breaking up or throttling of the same. I a

In all the methods adopted for securing the regular output of the pump irrespectivelv f t e variablespeed. of the cam shaft,

the best regulation can only be determined by experiment for each particular case.

An important improvement further consists in the arrangement of the spring 6 acting upon the ball d. Should the spring be too small it becomes diflicult to manufacture it to a very exact size, so that it may slip upon the ball and become jammed in its guide, and thus the operation will be irregular.

For this reason, I have been led to replace the said spring by flat springs with radial strips or tongues Figs. 29 and 30, these being punched out of thin sheet steel, and it is preferable that all the tongues should be made integral with a common ring-shaped portion is, so that the whole aggregate can be held in a suitable support t=, Figs. 24 and 246 the device being in concentric position so as to provide for an equal pressure of the ends of said tongues upon the ball (Z.

The proper vibrations of the said tongues shouldnot be allowedto affect the said ball, and to this end it may be preferable to form the sheet metal piece in such manner that the said tongues shall have unequal lengths while at the same time maintaining the symmetrical arrangement, as shown in Fig. 30.

Lastly, experience has proved that it is preferable to limit the amount of lift of the said ball (Z, so that I have provided it (Fig. 24) with an adjustable stop-rod e which may be moved either way by screwing or unscrewing a milled head Q02, whilst the aggregate of the support i containing the spring 6 and the stop-rod '0 can be displaced by the milled hand-wheel e0 Obviously, the above-mentioned arrangements are not of a limitative nature and are given solely by way of example, being susceptible of all necessary modifications without departing from the principle of the invention.

In particular, the arrangement may comprise a plurality of ball-valves or like valves (Z disposed rearwardly of a corresponding number of apertures 0, or otherwise a plurality of apertures c co-operating with a common valve d; the said release device may also be modified, as well as the control of the tension of the springs g and e.

What I claim is 1 1. A percussionpump comprising a pump body and a striker disposed therein a stationary member having a conduitformed therein, the said striker being adapted to ary member having a conduit formed therein, means enabling the said striker to strike abruptly against the said stationary member and to discharge the liquid abruptly compressed between the striker and the stationary member into thesaid conduit.

3. A percussion pump comprising a pump body, a striker disposed therein, a stationary member having a conduit formed therein, and a quick release device controlling the said striker whereby the same shall be impelled against the said stationary member.

4. A percussion pump comprising a pump body, a striker disposed therein, a stationary member having a conduit formed therein, a valve or ball disposed adjacent the said conduit and situated. on the opposite side of said stationary member from the striker, andmeans impelling the said strikeragainst the said stationary member.

5. A percussion pump comprising a pump body, a striker disposed therein, a stationary member having a conduit formed therein, a spring urging the said striker against the said stationary member, a rod :secured to the striker, a releasing element pivoted to the end of said rod, and means for controlling the said element in such manner that the striker shall be separated from the stationary member while at the same time compressing the said spring and shall be then abruptly brought back by said spring, thereby assuming a well-defined movement which is independent of the speed of the device controlling the release.

6. A percussion pump comprising a pump body, a striker disposed therein, a stationary member having a conduit formed therein, a spring urging the said striker against the said stationary member, a quick release element for compressing the said spring and for subsequently releasing the said striker, a valve disposed adjacent the conduit of the stationary member and situated on the opposite side of said member from the striker, spring urging the said valve against the outlet of the conduit, and means for regulating the tension of the striker spring and of the spring controlling the said ball.

7 A percussion pump for fuel injection into the cylinder of an internal combustion engine, comprising a pump body, a striker disposed therein, a stationary member having an aperture, formed therein against which't-he said striker is impelled, ;means for actuating the said striker, means for fuel feed to the interior of the said ,pump body, and suitable piping whereby the engine cylinder shall be supplied with the fuel which is discharged by the said striker at each stroke,

8. A percussion pump for elevating liquid fuel from a supply tank and for detwochambers, means causing the striker to strike against the said partition and todischarge the Qfiuid in the pump body through the "said conduit, .a valve disposed adjacent the said conduit and situated in the second chamber of the pump, a spring urging the said valve against the outlet of said conduit, means whereby the action of said striker and the tension upon the said ball can be regulated from the exterior, suitable packing members and stutfing boxes disposed within the pump body.

10. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein and disposed within thepump body in such manner as to divide the same into two chambers, a spring disposed in immediate proximity to the head of the striker and adapted to impel the saidstriker against the said partition, a ball disposed adjacent the said conduit and situated within the second chamber, means urging the said ball against the outlet of the said conduit, and aquic'k release device "for compressing the striker spring and subsequently releasing the said striker.

11. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein and disposed within the pump body in such manner as to divide the same into two chambers, a spring disposed in immediate proximity to the head of the striker and adapted to impel the said striker against the said partition, a Cardan device interposed between the end of the said spring and the striker head, a like Cardan device interposed between the end of the spring and the wall of the pump body upon which it is caused to bear, whereby all lack of symmetry in the action of the spring shall be 0bvi ated, a valve disposed adjacent the said con duit and situated Within the second chamber, means urging the said valve against the outlet of the said conduit, and a quick release device for compressing the striker spring and subsequently releasing the said trikr 12. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein cooperating with the head of the striker, a valve disposed adjacent the said conduit of i the stationary partition and situated on the opposite side of the latter from the said striker, means urging the said valve against the outlet of the said conduit, a spring adapted to impel the head of the said striker against the said partition, a rod secured to the head of the striker, a transverse axle mounted at the end of the said rod, a double-armed rocker, an open slot or notch formed in one arm of the said rocker and co-operating with the said transverse axle, a cam controlling the other arm of the said rocker and provided with an offset for the dropping of the said arm, and means for rotating the said cam.

13. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein, means for impelling the head of the said striker against the said partition, a quick release device controlling the striker, a valve disposed adjacent the said conduit and situated on the opposite side of the said partition, and means whereby the l quid stream which the striker tendsto produce at each stroke shall be broken up within the conduit formed in the stationary partition between the striker head and the said ball.

14. A percussion pump comprising a pump body, a striker disposed therein, a stat onary partition having a conduit formed therein, means for impelling the head of the said striker against the said partition, a quick release device controlling the striker, a valve disposed adjacent the outlet of said conduit and situated on the opposite side of the said partition, a member restricting the said conduit of the stationary partition at a given point, a coaxial member disposed withinthe said conduit, and a second member restricting the said conduit at another point, in order to break up the liquid streams which would tend to be formed within the said conduit, and a valve situated adjacent the outlet of the said conduit.

15. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein, and disposed within the pump body, means for impelling the head of the said striker against the said partition, a quick release device controlling the striker, a valve adapted to close the end of the said conduit on the side of the partition opposite the striker, an elastic member consisting of a cut-out metal disc forming radial tongues whose ends adjacent the centre of the disc co-operate with the said valve or ball in order to urge the same against the outlet of the said conduit, means whereby the liquid stream which the striker tends to produce at each stroke shall be broken up within the conduit formed in the stationary partition.

16. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein and disposed within the pump body, means for impelling the head of the said striker against the said partition, a quick release device controlling the striker, a valve adapted to close the end of the said conduit on the side of the partition, opposite the striker, an elastic member consisting of a cut-out metal disc forming unequal radial tongues whose ends adjacent the centre of the disc co-operate with the said valve in order to urge the same against the outlet of the said conduit, means whereby the liquid stream which the striker tends to produce at each stroke shall be broken up within the conduit formed in the stationary partition.

17. A percussion pump comprising a pump body, a striker disposed therein, a stationary partition having a conduit formed therein and disposed within the pump body, means for impelling the head of the said striker against the said partition, a quick release device controlling the striker, a valve adapted to close the end of the said conduit on the side of the partition opposite the striker, an

elastic member consisting of a cut-out metal disc forming rad al tongues whose ends adj acent the centre of the disc co-operate with the said ball in order to urge the same against the outlet of the said conduit, and an adjustable stop piece for limiting the amount of lift of the said ball, means whereby the liquid stream which the strike tends to produce at each stroke shall be broken up within the conduit formed in the stationary partition.

In testimony that I claim the foregoing as my invention, I have signed my name hereto.

ROBERT ESNAULT-PELTERIE.

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