US1292457A

US1292457A - Pump-operating mechanism.

Info

Publication number: US1292457A
Application number: US17723617A
Authority: US
Inventors: Louis Bennet Hall
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-06-27
Filing date: 1917-06-27
Publication date: 1919-01-28
Anticipated expiration: 1936-01-28

Description

L. B. HALL. PUMP OPERATING MECHANISM. APPLICATION FILED JUNE 2?. 1917.

1,292,457. Patented Jan. 28, 1919.

' anism for varying ram R comprise LOUIS BENNET HALL, OF LONDON, ENGLAND.

PUMP-OPERATING- MECHANISM.

Specification of Letters Patent.

Application filed June 27, 1917. Serial No. 177,236.

To all whom it may concern:

Be it known that I, LOUIS BENNET HALL, a subject of the King of England, residing in London, England, have invented certain new anduseful Improvements in Pump-Opcrating Mechanisms, of which the following is a full, clear, and exact description, re'n erence being had to the accompanying drawing, forming part of this specification, in which I have illustrated in section and partially in elevation one form of pump and operating mechanism therefor which is arranged to feed liquid fuel to an internalcombustion engine, and in which the operating'mechanism for actuating the pumpp1ston is controlled by a pressure-governor, which is in turn controlled by the charge fed to the engine.

This invention relates to an improvement in pump-operating mechanisms, and is designed to provide a cheap and efficient mechthe throw of the piston without varying the throw of the driving motor or actuating member.

The precise nature of my invention will be best understood by reference to the accompanying drawings which will now be described, it being premised, however, that various changes may be made in the details of construction and the general arrangement of the various parts, without departing from the spirit and scope of my invention, as defined in the appended. claims.

Referring to the structure shown in the figure, the reference characters DP designate the fuel delivery passage to the engine and OP the fuel pump. IV is an inlet valve to the pump chamber and 0V is an outlet valve therefrom, opening into the fuel'deliv-ery passage. Mounted for reciprocation in the pump casing is a ram or piston R, which is arranged to be reciprocated by an eccentric E connected to a shaft which may be either the engine crank shaft or a shaft driven therefrom. The driving connections between the eccentric E and the a slide block S mounted in a guide SB, and pivotally connected to this slide block S and the ram R is a walking beam, which is connected at one end to the eccentric and the slide block by a pin S, the other end B of the walking beam being connected to the ram R by means of a block V. This block V is pivoted to the end of theram and is provided with an opening through which the end B of the walking beam is having a movable piston PP therein,

adapted to slide. The central portion of the walking beam extends through an opening in a floating block FP, which is connected by means of a pin P, with one end of a 16 Ver X connected to a shaft Y. This shaft Y is journaled in bearings in a casing K- whlch incloses the ram operating mechanism, and is arranged to rock in its bearings when the floating block is moved as hereinafter described, along the walking beam to vary the throw of the ram R. The osition of the floating block on the wal 'ng beam i arranged to be controlled by a controlling lever RR which is pivotally connected to the floatin block by the pin P which connects said block to the lever X. One end of this controlling lever ER is provided with a fork having pins therein which engage a groove between flanges C on a sleeve SL, which is arranged to be controlled by the pulsator as hereinafter described. The other end of the lever RR extends through a pivoted sleeve PC", which is supported by links AL and L. The link AL is pivotally connected to the casing K at AP, while the link L is pivotally connected to a crank M on a shaft M. This shaft M may be rocked by any suitable controlling mechanism, or may be rocked by hand through the medium of the lever connections shown in the figure to adjust the position of the sleeve PC", which constitute a shiftable pivot for the right-hand end of the controlling lever RR. V

The controlling or governing mechanism for the variable pump actuating mechanism just described, comprises a compensating cylinder CS which contains a column of air, gas or any other compressible fluid and which will hereinafter be termed the air column. Movably mounted in the lower end of this cylinderGS is a piston CP having a piston rod which extends downwardly thererom and connected to this piston (rod is the sleeve SL. Located within the sleeve SL and surrounding a hollow-stem D is a spring SP which is arranged to be compressed by the column of .air

The piston rod in the piston OP extends downwardly to the hollow stem head PO on the end thereof. Connected to the lower end of the rod CP is a wire or cable W through which the piston may be moved downwardly by hand, if desired. The pulsator comprises a cylinder P91 Patented Jan. 28, 1919.

and has a inclosed within a casing CC is a cam M", which is connected to a shaft SH. This shaft SH is arranged to be actuated by the engine to be supplied, and the cam is provided with a groove which engages a roller will only be opened by the piston PP when it is at the extreme end of its stroke. Jonnected to the cylinder PO and communlcating therewith by means of a port is a valve casing having a puppet valve RV mounted therein, which is arranged to open and close communication between the cylinder PC and the pipe Q which is in communication with the compensating cylinder CS. The valve RV is maintained on, its seat by a spring VS, held in position by a hollow nut VC. This valve is provided with a downwardly extending stem ST which extends into the-casing CC. T is a tappet within the casing CC which is arranged to be raised by a cam VC on a shaft rotatably mounted in bearings on the casing CC. This shaft is arranged to be rotated by means of gears connecting it with the shaft SH.

During the operation of the engine the piston PP is reciprocated, and at the lower end of each stroke the pressure in the cylinder PC is equalized with the pressure in the pipe p, and as the piston is moved up- 7 wardly toward the other end of its stroke,

I end to permit the equalization sure within the cylinde and at the other end to equalize the presthe valve RV will be openedby its mechanism to equalize the pressure in the cylinder PC and the pressure in the compensate ing cylinder CS, and if there is any variation of the conditions, the piston GP inthe compensating cylinder will be moved in accordance therewith. This movement of the piston CP will shift the controlling lever RR and accordingly vary the stroke of the plunger R.

The device just described, the cam M is provided with dwells to maintain the piston CP stationary for a short period of time at both ends of its stroke; at the one of the presand the pipe 39 sure in the cylinder PO withthe pressure in the compensating cylinder CS by opening the valve RV which is open when the piston PP is stationary, which will avoid the fluctuation of the piston CP except when changes in conditions occur. If the valve were omitted the piston CP would be fluctuated in accordance with the pulsation of the piston PP. 'The cam M may be one which is a simple circular eccentric. Even with such a cam the fluctuations of pressure transmitted to the column in Q, from PC are only those which occur during the fraction of the stroke of PP during which the valve RV is open, and they are therefore much less than the whole range of the fluctuations in PC. If desired I may use another form of pulsator than that shown in the drawings, with which Imay use a valve structure such as shown in Fig. 2, and in which the valve RV is arranged to be moved at the endof the up stroke of the piston PP to equalize the pressure in the cylinder and an auxiliary chamber between the valve 'RV and a second valve SV which is normally held to its seat by a spring, and to then equalize the pressure between the auxiliary chamber and the pipe Q by opening the valve SV after the valve RV has been closed. By means of a plurality of valves and an auxiliary chamber between the compensating cylinder and the pulsating cylinder, I am enabled to overcome the pulsations of the pulsator even when using a continuously moving piston.

In the operation of the device, the pump is continuously operated by the eccentric E and the shaft SH is also continuously rotated to operate the pulsator and its valves. The crank shaft M may be adjusted to adjust one end of the controlling lever RR, either automatically or by hand, while the other end of said ,lever is automatically adjusted by the pressure in the compensating cylinder OS to meet the various atmospheric conditions.

The advantages of my invention result from the provision of a pump operating mechanism, in which the throw of the iston of the pump may be readily varied by two different sets of adjusting mechanisms without varying the throw of the actuating member for the pump.

In the foregoing description, I have described the mechanism for operating a pump adapted to be used in connection with fuel supply devices for internal combustion englnes, such as shown in my co-pending a plication Serial No. 177,237, filed June 2 1917, but it will be readlly understood that the mechanism is applicable to plungers which are to be reciprocated and in which the movement of the plunger is to be varied without varying the throw of the actuating member.

I claim: Y

luPump operating mechanism, comprising a walking beam connected at one end to the piston of the pump, means for actuating the other end of the walking beam, a floating sets of adjusting mechanisms for ad usting.

the walking beam fulcrum for varying. the movement of the reciprocating member without varying the throw of the actuating means; substantially as described.

3. Pump operating mechanism, comprising a Walking beam connected at one end to the piston of the pump, means for actuating the other end of the walking beam, a floating fulcrum for the walking beam, a movable support for the fulcrum, a controlling lever pivotally connected to the fulcrum and the supporting shaft, link mechanism for adjusting one end of the controlling lever, and means for adjusting the other end of the controlling lever to vary the movement of the pump piston without affecting the throw of the actuating mechanism; substantially as described.

4. Pump operating mechanism, comprising a walking beam connected at one en to an actuating member, a floating fulcrum for the walking beam through which the walking beam is adapted to slide, a second floating fulcrum connecting the other end of the walking beam to the pump piston, a movable support for the floating fulcrum, and means for adjusting the position of the floating fulcrum to vary the throw of the pump piston without changing the throw of the actuating means; substantially as described.

5. Pump operating mechanism, comprising a walking beam connected at one end to an actuating member, a floating fulcrum for the walking beam through which the walkslide, a second floatthe other end of the a movable and a controlling lever PlVOttLllY connected to the movable support for the floating fulcrum, a sleeve slidably mounted on one end of the controlling lever, toggle levers connected to said sleeve, and lever mechanism connected to one of said toggle members for shifting the controlling lever; substantially as described.

6. Pump operating mechanism, comprising a walking beam connected at one end to an actuating member, a floating fulcrum for the walking beam through which the walking beam is adapted to slide, a second floating fulcrum connecting the other end of the walking beam to the pump piston, a movable support for the floating fulcrum, a controlling lever pivotally connected to the movable support for the floating fulcrum, a sleeve slidably mounted on one end of the controlling lever, toggle levers connected to said sleeve, and lever mechanism connected to one of said toggle members for shifting the controlling lever, together with a second adjusting means for adjusting the position 0 stantially as described.

f the other end of the controlling lever; su'b- 7. Pump operating mechanism, comprisbeam connected at one end of the piston of the pump, a floating fulcrum for the walln'ng beam, a slide block connected to the other end of the walking beam, an eccentric for reciprocating the slide block, a supporting lever for the floating fulcrum, a controlling lever pivotally connected to the supporting lever arranged to oscillate about the axis of the floating fulcrum, link mechanism for adjusting one end of the controlling lever, and a pressure governor for adjusting the other end of the controlling lever; substantially as described.

In testimony whereof I have signed my ing a walking name to this specification.

LOUIS BENNET HALL.