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Publication numberUS2423720 A
Publication typeGrant
Publication dateJul 8, 1947
Filing dateNov 12, 1941
Priority dateNov 29, 1940
Publication numberUS 2423720 A, US 2423720A, US-A-2423720, US2423720 A, US2423720A
InventorsFranz Neugebauer, Paul Mullejans
Original AssigneeFranz Neugebauer, Paul Mullejans
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Starter for free piston motor compressors
US 2423720 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

July 3, 1947. P. MOLLEJANS ETAL [2,423,720

' swzm: FonvFRma rrsron MOTOR, courmassons Filed Nov. 12. 1941 2 sheets-sheet 1 J2 g 4/0 I ,Ivenzs PazzZ MZZeJzns and) Ii'anz Jl/ugebauer Jy MJ Am'ney l Jilly 3, l947- n P. MULLEJANs ETAL `2,423,720

STARTER FOR FREE PISTON MOTOR COIIPRESSORS Filed Nov. l2, 1941 2 Sheets-Sheet 2 l J5 J 4/0 I Y T" ,Ill llllllllll l 33 Hull' Z'nvenbrs fana Maag/12ms and, l ZW/'nmz Nealgeauz' the motorpart by a Patented July 8, 1947 STARTER. Fon FREE ris'roN Moron coMPm-:ssons l Paul Mllejans, Lindau,

Munich-Allach, Germany;

and Franz Neugebauer,

vested in the .littor-l ney General of the United States Application November 12, 1941, Serial No. 418,666 In Germany November 29, 1940 10 Claims. (Cl. 2210-56) This invention relates to a device for startla piston forming part of the flying mass operates, is filled with the starting fluid under pressure. Then the locking device is released. Now the fluid under pressure is capable of displacing the ilying mass, whereby it expands, doing Work, thus eiecting the compression of the cylinder charge immediately or after reversal ,ofV

:the'direction of motion.

Furthermore, it is well -known in free piston motor compressors with multistage compression to l.utilize all or one of the working spaces of the .stages of compression as starting spaces.

The upper and lower limits of the pressure of the starting iluid, existing in the starting space immediately before setting the flying mass going are positively controlled.

The lower limit is determined by the fact that the motor cylinder charge is to be subjected to the compression required for regular ignition, i. e. for initiating the first motor-working stroke (which is especially important when the motor part as in the usual case 'works according to the Diesel process). The lower` limit of pressure is further determined by the fact that the spaces used for starting must be able to intercept the energy" produced in the first Working stroke of suiliciently strong cushion of compressed fluid. tant when separate spaces are used for starting, asin .th case oi multistage compressors, because then the outlet pressure corresponding to other hand this upper limit is also determined bythe fact that the compression of the motor cylinder charge must not exceed a certain value, as otherwise the pressures of combustion would become so high that the motor part could be damaged.

The importance to be imputed to the right adjustment of the pressure of the starting fluid in the starting spaces, as regards safe starting as Well as avoiding detrimental disturbances, makes it desirable to provide eillcient safety guards for maintaining'the right pressure in the starting spaces.

Therefore an object of this invention is to provide means for automatically maintaining the right starting pressure so that the pressure of the fluid existing in thestarting spaces im-y mediately before setting in motion the flying mass does not surpass a predetern'iinedv upper or lower limit. These limits are generally re-` mote from each other, but may also coincide.

i AsA means to prevent exceeding the upper limit of pressure there are considered: j

(l) A `pressure controlling device (pressure reducing valve) inserted into the line for admitting fluid under pressure from a container .to the starting space which device throttles an KK optional pressure of compressed fluid automati- This is especially impornormal operation in these compression spaces is only gradually established in the course of a. p1u rality of strokes.

The upper limit of pressure is of course determined. on the one hand. by the strength of the walls confining these spaces (for instance, in case that a compressor space Working with low outlet pressure in the normal operation is used, this pressure cannot be chosen higher or essentially higher than this outlet pressure). On the cally down to a pressure corresponding to the upper limit of pressure in the starting space;

(2) An overflow valve inserted into the line connecting the starting space with a space of lower pressure and opening as soon as a predetermined pressure in the starting space is attained thereby allowing fluid under pressure to enter the space of lower pressure:

(3) A safety valve inserted into an outlet of y the starting space or behind the overow valve and opening a passage to the open air as soon as a predetermined pressure in the starting space, or in the spme behind the overow valve respectively, is attained.

Means to prevent exceeding the lower limit of pressure are:

(fa) A releasing member charged 'with the pressure of the fluid under pressure coming from the starting space and releasing a locking `member retaining the flying mass only after this the pressure required for releasing the locking member.

(b) An overilow valve in the line between the' starting space and a space of lower pressure, for instance, the working space of a releasing member, the effective pressure of which is lower than the opening-pressure of the overilow valve. This valve prevents the iluid under pressure from flowing oi to a space of lower pressure or to the releasing member, before the starting space is lled with the fluid under pressure up to the lower limit of pressure.

By the indicated means even a double safety guard may be obtainedagalnst an excessively high or low starting pressure.' safety guard a disturbance can only occur when both safety members fail to operate at the same time. The probability of such a disturbance is very remote in case of a simple safety guard. This is especially true when both safety members are of diierent kind, as safety members f the same kind may in certain cases be liable to the same defect and therefore may fail simultaneously more easily than' two members of diierent kind.

As a double safety guard against excessive pressure, a pressure-reducing valve in the supply pipe and an overow valve in an outlet of the starting space, may be provided iny combination with a safety valve. 4

A double safety guard against too low pressure is formed by a releasing member connected over an overflow valve with the starting space, the effective pressure of said member approximating the opening pressurey of the overilow valve.

'Ihe invention proves very valuable also in case that a plurality of starting spaces is provided in an engine, which spaces are to be lled with starting iluids of different pressure. In this case, the starting spaces are connected with one an# other, that is, the last starting space which con# tains the gas of the lowest pressure is connected with the releasing member by pipes having over? cally ll with uid under pressure up to the lower .limit of pressure adjoined to each of the starting spaces and determined by its overow valve.

Also in this case a double safety guard against excessive pressure is possible for each starting space by inserting, into the pipe between the overflow valve ofv the one starting space to the next one, a pressure controlling deviceadjusted' to the highest starting pressure admissible for the subsequent starting space.

The invention is illustrated in the annexed drawings, of which With such double v Fig. 1 is a vertical, axial cross-section of a starter constructed in accordance with the invention comprising two working spaces, a pressure reducing valve, an overilow valve, a safety* valve and a locking and releasing device;

Fig. 2 is a similar cross-section of a starter in which the engine is formed as a multistage com- Fig. 4 illustrates a simplification in case the lower limit of pressure in the starting` space having the lowest pressure is equal towzero.Y

The drawings show diagrammatically several modifications ofthe invention, in each. case the left half of a free piston motor compressor provided with oppositely moving flying masses. Corresponding parts of the figures are denoted by the same reference letters.

In the arrangement shown in Fig. 1 a compression cylinder 2 is connected-on the one hand with a motor cylinder I and on the `other hand with a cylinder 3. 'I'he flying mass is composed of the motor piston 3 the compression piston I and a. piston 6 operating in the cylinder 3. The compression cylinder 2 comprises two working spaces: the compression space proper 3 and the working space 3 turned toward the motor cylinder and working as a scavenging pump. The

scavenging air iiows from the space 9 to a, con-y instance,` as a cushion or as a higher stage of compression. The compressed iluid for starting is stored under high pressure in a container 2l which may be refilled through a pipe 2I coming from a source of compressed fluid, for instance. a compressor and including a shut-off member 22. A second'shut-oif member 23 connects the container 20 with a.withdrawal line 24 leading to a reducing valve 25 which throttles the pressure ofthe container down to the maximum pressure admissible in the starting space I2. `From the reducing valve 25 a pipe 26 including a handoperated starting valve 21 leads to the starting space I2. A pipe 28 branching oil? behind the hand-operated starting valve 21 leads to a similar starting space of the other half of the engine.

A rod 30 is rmly secured to the compression piston and conducted outwards, which rod may simultaneously form part of the connecting gear compelling the oppositely moving ilying masses to synchronous motion. A tooth or catch 3| is lixed on the rod 30 which may engage a pawl 33 swingable abut a stationary fulcrum 32. This pawl is connected with a piston 4I sliding in a stationary cylinder 40. Fluid under pressure may be supplied through the pipe 36 to the space 42 above the piston 4I. A pressure spring 43 acts upon the back side of the piston. An auxiliary pawl 38 is further connected with the paw1,33 arranged to engage a .stationary abutment 3l when pawl 33 is released from the tooth 3l against the action of the spring 43. whereby pawl 33 isprevented from catching again after being released. By means of a handle ll provided on the auxiliary pawl 38 the latter may be released from the abutment 33 to initiate a new starting operation. From the starting space I2 a duct 3| leads to an overiiow valve 45 connected with the pipe 36 from which a duct 31 is branched oif which leads tothe open air over a safety valve 48. l

In order to make the operation of the contrivance as clear as possible, the following nupressures:

merical values may be assumed for the single Superatmospheric pressure,

atmospheres Highest admissible pressure in starting space 25 I dmissible pressure instarting space The safety valve 46 may be adjusted to 5 The releasing member 4I may be adjusted The resulting operation is as follows:

The flying mass e, 5, Is is at first shifted to the stage compressor, so that the cylinder 2 and the piston 5 with'the working space 8 form the iirst stage oi' compression, and the cy1inder'3 and the piston -Ii with the working space I2 form the a /second stage of compression. In this case` the working spaces 8 and I2 areto be used as start-` ing spaces at the inner dead center position of the compressorv pistons, the pressure of starting uid' to be admitted to these spaces correspondl ing to the outlet pressures of the stages of compression obtained in the normal operation. Therefore the space -8 is to be charged with compressed starting gas of an essentially lower pressure than the space I2. The .pressure valves I and 52 are so -arranged that the ducts leading from the compression working spaceto the ducts in which these valves are located kare closed by the pistons 50116, respectively, in the starting position,of said'pistons, as shown in Fig. 2. In

left by means of rod 30 until the pawl 33 under zo order to prevent thebompressed starting as from the action of the spring 43 can engage the catch 3l.. The shut-off member I4 controlling the starting space I2 is closed and the shut-off valve on the container of compressed fluid 2l) is opened.

ilowing off at the subsequent starting stroke from the working spaces through these pressure valves into the discharge pipes yet free from pressure on starting, a so-called pressure maintaining NOW the hand'operated Starting Valve 21 is 25 valve 53 "or 54 respectively is arranged behind the opened for a short time and thereby the ustarting space I2 is lled with uid under pressure. lAs soon as the pressure inthe space I2 has reached atmospheres superatmospheric pressure, the overflow valve 45 opens, so that now fluid under pressure may .enter the working space 42 of the releasing device 4I. When the pressure in the space -42 has reached 2 atmospheres superatmos` pheric pressure, the piston 4I overcomes the action of the spring 43 and draws the pawl 33 away 35 mains closed on starting but in the normal Op from the catch 3l. The pressure now existing in the 'starting space I2 is able to'displace the flying mass 4, 5, 6. The starting operation is vthereby initiated. The pressure in the starting space I2 cannot surpass in this case the pressure of 20 atn mospheres superatmospheric pressure, to 'whichg the overflow valve 45 is adjusted, becausethis valve vopens as soon as this pressure is reached,

and the excess of fluid will ow off to the releas-v ing device or Should this valve d5 fail to open, the pressure in space I2 would increase at most to the pressure of atmospheres superatmospheric pressure, established by the reduction Valve 25. This in- Volves a double safety device against the forma- 5 tion of an excessive pressure in the starting space I2. A safety guard preventing the pressure in the space i2 from becoming too low is warranted by the fact that the releasing device 'di acts only when it is charged with a pressure of 2 atmos- 55 pheres superatmospherie pressure, required for overcoming the pressure of the spring 43. This pressure, however, can only take place when the overow valve 45 opens, that is when the starting through the safety valve 46.45

- pressure valves of each compression stage. Each 80 the valve side with the pressure of the discharge pipe and on the other side by a spring 59. The action of the spring is greater than the pressure v of the starting gas acting 'on the valve disk. Consequently the pressure-maintaining valve reeration during which the full iinal pressure of the corresponding compression stage permanently prevails this valve is continuously kept open by this pressure.

The means for supplying fluid under pressurev to the space I2 are similar to those shown in Fig. 1. The space I2 is again connected to the `duct leading to the overflow valve 45. From the latter a pipe 60 leads to the workingspace 8. This space is connected by a duct G2 to an overow valve di, from which a pipe 36 leads to the releasing space 42. Furthermore a pipe 3l is branched oli from pipe 36 leading to the safety o valve which opens into the open air.

1 For the pressures the following numerical values may be assumed:

Atmospheres space 'I2 is lled with iiuid under pressure up to 60 Highest 'admissible pressure in the starting the lower limit of pressure (20 atmospheres superatmospheric pressure). Should the device di fail to release (for instance, by getting jammed or for pressure. This means' that also in this vcase an ,m

effective safeguard against the formation of an excessive pressure in the releasing space d2 is established.

Fig. 2 shows a modification in which the comsuperatmospheric pressure Highest admissible pressure in the starting v space I2 25 Lowest admissible pressure inthe starting space i2 20 space l6 Lowest'admissible pressure in the starting space 2 4 {lorrespondinglyu The reduction valve 25 is adjusted to 25 The overilow valve d5 is adjusted to 20 The overow valve al is adjusted'to 4 Furthermore i The safety valve d5 may be adjusted to-- 2 The releasing 'member 4I may be adjustedto 1 When the pressure in the high-pressure starting space i2 on supplying the uid under prespresser part of the engine is formed as a multies sure has attained 20 atmospheres superatmospheric pressure, the overilow valve EB opens and pressure in pipe 38 has attained 1 atmosphere superatmospneric pressure. At this moment the high-pressure starting spaceI I 2 is lied with compressed rluid under a pressure o! 20 atmospheres superatmospheric pressure, the low-pressure starting space s with compressed fluid under a pressure of 4 atmospheres superatmospheric pressure. This lling of the two starting spaces with compressed iluid under the pressure intended for them, respectively, automatically takes place on opening the hand-operated starting valve 2'I. Depending upon the pressure-reducing valve 25, the maximum pressure inthe starting space l2 cannot exceed the value of 26 atmospheres superatmospheric pressure, in case the overilow valve its should fail to open. Likewise the pressure in the low-pressure starting space e cannot assume an excessive value should the releasing device 4I fail to operate, because it'is allowed to drop owing to the overilow valve 4l and the safety valve 46; 'moreover the upper limit ofthe pressure in the releasing space t2 is also determined by the safety valve 45.

If it is desired to doubly safeguard the lowpressure starting space against excessive pressure, the arrangement shown inFig. 3 may be adopted. Again the overflow valve 45 is connected to the outlet 34 of the high-pressure starting space I2. Into the pipe 50 coming therefrom a pressurecontrolling device 65 is inserted, which is ad- 'justed in such a' manner that in its outlet 5I connected with the low-pressure starting space 8 only the highest pressure admissible in this space can occur. Further, a safety valve 65 communicating with the open air is connected to a pipe 68 branched oi from pipe 60. At the point where the pipe el communicates with the space 8, advantageously a check-valve 64 may be provided in order to keep away the variations in pressure occurring in space 8 during the normal operation from the pressure-controlling device 65. The numerical example `given in connectionwith Fig. 2 is therefore to be completed as follows:

Atmospheres superatmospheric pressure The pressure-controlling device 65 between the two starting spaces is adjusted to 6 The safety valve 6.6 before the device B may be adjusted fn 18 diilerent working spaces that are lled with fluid under diileren'tpressures are used for starting,

a simplification is possible in some cases, for example, if the lower limit of pressure in the starting space having the lowest pressure is equal to zero, i. e., if the engine scarcely starts at a presfsure ot 0 atmospheres superatmospheric pressure,

existing Yin this starting space, but-it is desired that this working space also participate inthe starting operation. p

In this case the arrangement shown in Fig. 4 may be adopted which differs from that shown in Fig. 2 by the space Il working with the lower lstarting pressure being immediately connected with the releasing space 42 over the pipe $5, without the intermediary of an overflow valve. 'Ic this pipe 36 merely the safety valve 6I leading to the open air is connected over the branchpipe S1.

For this example the following numerical values The overow valve 45 is adjusted to-- 20 The safety valve 46' behind the low-pressure starting space is adjusted tos---" 6 Further the releasing member 4I may be ad- Justed to In this case the operation of the device is as follows:

In the normal casethe pawl 33 is released when the pressure inuencing the releasing member II has attained the value of 4 atmospheres superatmospheric pressure. The same pressure then acts in the low-pressure starting space 8, whereas in the high-pressurestarting space I2 a pressure of 20 atmospheres superatmospheric pressure, is acting. Should it now occur that due to a defect of the releasing member as, for instance, relaxation in force of the spring the releasing of the catch 33 takes place at a pressure essentially lower than the pressure of 4 atmospheres superatmospheric pressure, provided for this releasing operation, for instance, at V2 atmosphere superatmospheric pressure, it is true that likewise only a pressure of Vgfatmosphere superatmospheric pressure, assists in starting, but the engine is nevertheless set in motion,'because the starting pressure of 20 atmospheres superatmospheric pressure, existing in the high-pressure starting space 12 just sumces for starting.

We claim:

1. In a device for starting a free piston motor compressor by means of uid under pressure, said compressor having a flying mass formed by pistons displaceable in stationary cylinders and forming with said cylinders a plurality of working spaces, the combination oi.' a locking device for holding said flying mass in its dead center position; a container illled with said fluid under pressure; a pipe line connectingsaid container with a, selected one of said working spaces: a

` releasing device `adapted to be infiuencedby said fluid under pressure and to release said locking device; a second pipe line connecting -said sereleasing device when the pressure in said space exceeds a predetermined limit.

2. In a device for starting a iree'piston' motor .sure of said fluid in compressor by means of fluid under pressure; said compressor having a iiying mass formed by pistons displaceable in stationaryv cylinders and forming with said cylinders a plurality of worklng spaces, the combination of a, locking device for holding said flying mass in its dead center position; a container filled with said fluid under pressure; a pipe line connecting said container with a selected one of said working spaces; a releasing device adapted to be iniiuenced by said uid under pressure and to release said locking device; a second pipe line connecting said selected working space with' said releasing device; means in said second pipe line for releasing fluid pressure from said selected space to said releasing device when the pressure in said space exceeds a determined upper limit; and means for maintaining said released pressure below a second determined pressure limit lower than said rst limit.

with a selected one of said working spaces; a pressure-controlling valve in said pipe line, adjusted to maintain the pressure of said fluid in said selected working space below a determined upper limit; a releasing device; a vsecond pipe line connecting saidselected working space with said releasing device, and pressure controlling means in said second pipe for releasing pressure from said selected space into said releasing -device at a pressure below said upper limit.

4. In a device for starting a free piston motor compressor by means of uld under pressure, said compressor having a flying mass formed by pistons displaceable in forming with said cylinders a plurality of working spaces, the combination of a. locking device for holding said iiying mass in its dead center position; a, container filled with said fluid under pressure; a pipe line connecting said container with a selected one of said working spaces; a releasing device adapted to be inuenced by said fluid under pressure and to release said locking device; a second pipeline connecting said selected working space with said releasing device;

and an over-flow valve in said second pipe line, i

adjusted to maintain the pressure of said uid in said selected working space below a predetermined limit.

5.- In a device for starting-a. free piston motor compressor by means of uid under pressure, said compressor having a flying mass formed by pistons displaceable in stationary cylinders and forming with said cylinders a plurality of working spaces, the combination of a locking device for holding said flying mass in its dead center position; a container filled with said fluid under pressure; a pipe line connecting said container with a selected one of said working spaces; an adjustable releasing device adapted to be influenced by said uid under pressure and to release said locking device; a second pipe line connecting said selected working space with said releasing device; and an over-flow valve in said second pipe line, adjusted to maintain the pressaid selected working space below a predetermined limit, said releasing dea pipe line connecting said container -stationary cylinders and w 10 vice being adjusted to release said vice when inuenced by the fluid under a pressure above said predetermined limit. v

6. In a devicer for starting a free piston motor compressor by means of fluid under pressure, said compressor having` a flying mass formed by pistons displaceable in stationary cylinders and, forming with said cylinders a plurality of working spaces, Athe combination of for holding said flying mass in its dead center position; a container filled with said fluid under pressure; a pipe line connecting said container with a selected one of said working spaces; an adjustable releasing device adapted to be inuenced by said iiuid under pressure and to release said locking device; a second pipe line connecting said selected working space with said releasing device; an over-now valve in said second pipe line, adjusted to maintain the pressure of said fluid in said selected working space below a predetermined limit, said releasing device being adjusted to release said locking device'when inuenced by the fluid under a pressure above said predetermined limit; and a -safety valve in said second pipe line, between and said releasing device, and adapted to permit escape of said fluid from said second pipe line when the pressure of said fluid in said line is above the pressure actuating said releasing device and above the said predetermined limit of pressure in the selected working space.

'7. In a device for starting a free piston' motor compressor by means of fluid under pressure, said compressor having a flying mass formed by pistons displaceable in stationary cylinders and forming with said cylinders a plurality of Working spaces, the combination of a locking device for holding said flying mass in its dead center position; a container pressure; a pipe line connecting said container with a selectedone of said Working spaces; a second pipe line connecting said selected one of said working spaces with a second selected one of said working spaces; a releasing device adapted to be influenced by said fluid under pressure and to release said locking device; and a third pipe line connecting said second selected Working space with said releasing device.

8. In a device for starting a free piston motor compressor by means of iiuid under pressure, said compressor having a flying mass formed by. pistons displaceable in' stationary cylinders and forming with said cylinders a plurality of working spaces, the combination of a locking device for holding said flying mass in its dead center position; a container filled with said fluid under pressure; a pipe line connecting said container with a selected one of said working spaces; a secondpipe line connecting said selected one of said working spaces with a second selected onev of said Working spaces; areleasing device adapted to be influenced by said fluid under pressure and to release said locking device; a third pipe line connecting said second selected working space with said releasing device; and means for maintaining the pressure of said uid in each of said two selected Working spaces within determined limits. i

9. In a device for starting a free piston motor compressor by means of fluid under pressure, said compressor having a flying mass formed by pistons displaceable in stationary cylinders and forming with said cylinders a. plurality of working spaces,V the combination of a locking device for holding said fiying mass in its dead center locking dea locking device said over-now valve filled with said fluid under assenso upper limit; a second pipe line connecting said selected one of said working` spaces with a second selected one of said working spaces an over-flow valve in said second pipe line, adjusted to maintain the pressure of said :duid in said first 'selected working space above a determinedlower lmit: a releasing device adapted to be influenced by said iiuid under pressure and to release said locking device; a third pipe line connecting said second selected working space with said releasing device; and an over-now valveA in said third pipe line, adjusted to'maintain the pressure of said iiuid in said second selected working space above a determined lower limit.

10. In a device for starting a free piston motor compressor by means of uid under pressure,

said compressor having a dying mass formed by pistons displaceable in stationary cylinders and forming with said cylinders a plurality of working spaces, the combination oi' a locking device for holding said iiying mass inits dead center position; a container filled with said fluid under pressure: 'a pipe line connecting said container with a selected one of said working spaces; a pressure-controlling valve in said pipe line, adusted to -maintain the pressure of said :fluid in said selected working space below a determined upper limit: a second pipe line connecting said selected one of said working spaces with a second selected one of said working spaces; an over-flow valve in said second pipe line, adjusted to 1nainl tain the pressure of said iluid in said iirst selected working space above a determined lower' limit; a pressure-controlling valve in' said second pipe line,

between said over-flow valve and said second selected working space, adjusted to maintain the pressure of said fluid in said second selected working space below a determined upper` limit:

a releasing device adapted to bev influenced by v said fluid under pressure and to release said locking device; s. third pipe line connecting said second selected working space with said releasing device; and an over-flow valve in said third pipe line, adjusted to maintain the pressure of said uid'in said second selected working space above a determined lower limit.

PAUL MILEJANS. FRANZ NEUGEBAUER.

anrEnENcEs CITED The following references are of record in the i'ile oi this patent:

,UNITED STATES PATENTS Number Name Date 2,112,368 Janicke Mar. 29, 1938 2,222,260 Janicke Nov. 19, 1940 2,086,228 Janicke July 6, 1937 2,038,442 Pescara Apr. 21, 1936 2,064,976 Janicke Dec. 22, 1936 2,086,162 Janicke July 6, 1937 1,757,215 Pescara May 6, 1930 2,168,828 Pescara Aug. 8, 1939 2,215,326 Janicke Sept. 17, 1940 2,282,297 Keller May 5, 1942 FOREIGN PATENTS Number Country Date 623,039 Germany 1935 623,038 Germany 1935 496,022 Great Britain Nov. 23, 1938 497,999 Great Britain Jan. 2, 1939

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2462745 *Apr 11, 1945Feb 22, 1949Participations Soc EtFree piston machine provided with pneumatic starting means
US2496805 *Jan 30, 1945Feb 7, 1950United Aircraft CorpStarting series of compressors
US2557982 *Nov 20, 1946Jun 26, 1951Baldwin Lima Hamilton CorpStarting means for free piston machines
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US5094595 *Aug 15, 1989Mar 10, 1992Labrador Gaudencio ALabrador water-wave energy converter
Classifications
U.S. Classification60/596, 123/46.00R, 417/268, 417/324
International ClassificationF02B71/02
Cooperative ClassificationF02B71/02
European ClassificationF02B71/02