US1881939A - Pumping mechanism - Google Patents

Description

Oct. 11, 1932. F. PURDY PUMPING MECHANISM Filed Aug. 8, 1928 Patented @cto 11 1932 STATES asset FREDERICK PURDY, OF FLINT, MICHIGAN, ASSIGNOR TO MARVEL CABBURETER COMPANY, OF FLINT, MTGHIGAN, A GORPGRATION OF ILLINOIS EUMPING MECHANISM Application filed August 8, 1928. Serial No. 298,370..

This invention relates to pumping mechanism and more particularly to novel means for feeding fuel from an automobile supply tank to the carbureter.

The primary object of'the invention is to provide fuel pumping means of simple, inexpensive and durable construction designed to be automatically controlled by pressure conditions existing in a passageway through which the fluid is pumped;

A further object is to furnish fuel pumping. means including an actuating member or device designed to be automatically placed in an inoperative position due to pressure condilt tions in a, passageway. through which the pumped fluid flows.

Another object is to provide a fuel pump of the diaphragm type combined with a diaphragm control which automatically throws the pump out of operation when pressure is built up sufliciently on one side of the control diaphragm.

A still further object is to provide a diaphragm pump having a cam actuated member designed to continuously operate the pump so long as the actuating member is permitted free movement; and regulating means combined with a member for automatically throwing the same into an inoperative position when the pressure in a fluid passageway rises to a predetermined degree.

Another object is to furnish a control mechanism including a piston or diaphragm urged in one direction by adjustable sprin means and adapted to move in the opposite direction under fluid pressure built up in a passageway.

With the foregoing objects outlined and with other objects in view, which will appear as the description proceeds, the invention con sists in the novel features hereinafter described in detail, illustrated in the accompanying drawing and more particularly pointed out in the appended claims.

The accompanying drawing shows avertical sectional view of the mechanism forming the subject matter of the present 'inventionl In the drawing 1 designates any suitable frame or casing, such as the cylinder block of an internal combustion engine. This frame is provided with an aperture 2 to permit a pump lever 3 to be moved in one direction by a cam or excentric 4 on a rotatable shaft 5. If the structure is employed with an internal combustion engine, the shaft 5 may be a part of the engineer an additional shaft driven by the engine, but to satisfy the demands of the present invention, the shaft should rotate or oscillate continuously while the engine is running.

Mounted on the exterior of the frame is a pump housing 6 having a neck 7 which abuts against a packing washer 8 that is interposed between the neck and a flange 9 surrounding the opening 2. It will be understood that the housing 6 is secured to the frame 1 by any suitable means (not shown). A passageway 10 in the neck of the housing allows the pump actuating member or lever 3 to extend into the housing.

The housing may be -formed of sections to permit the parts to be readily assembled or dismantled and a chamber 11 is arranged within the housing. This chamber accommodates a main intermediate ring 12 and end rings 13 and 14, and the, piston of the pump is formed by a diaphragm 15 made of some suitable flexible material which has its edge clamped between the rings 12 and 13 by any suitable means, such as screws 16.. so

For the purpose of protecting the dia phragm and preventing too great distortion of the same, metallic guard disks 17 and 18 are mounted on opposite sides ofthe diaphragm and are secured to the latter by any preferred means, such as rivets 19 These guards are of less diameterthan the bore of the rings in order that the diaphragm'may not be interfered with while reciprocating and each guard has a flared edge or periphery 20 for reinforcing purposes and if desired, to limit the movements of the diaphragm.

An abutment 21 is secured to the diaphragm by any suitable means, such as a screw 22 and is designed to constantly contact with the head 23 of the actuating lever. At

' this point, it will be noted that as the shaft 5 turns, the lever will be forced in a clockwise direction as indicated by the arrows and consequently, the diaphragm 15 will be moved in 1 one direction. spring 24 of the coil type,

moves the diaphragm in the opposite direcagalnst the guard 18. This guard has a central projection 26 which centers the actuating spring. p

Whenever the pump is in operation, fluid will be drawn intothe chamber 25 through a pipe 27 that leads to the pump from the storage or supply tank and the'fluid entering the pump will pass a suitable check valve 28 that may be seated by a spring 29. Fluid drawn into the pump will be forced out through a passageway 30 controlled by a ball check valve 31 that is seated by a spring 32, which may be adjusted or reached by the manipulation of a screw 33. After the fluid asses the check valve, it enters a duct 34 w ich communicates with a pipe 35 that leads, for instance, to the float chamber of a carbureter.

As such float chambers are usually provided with float-operated valves, I make use of such valves for automatically controlling the operation of the pump. or instance, when the float chamber valveis closed, the fluid pumped cannot pass through the pipe 35 and consequently I force it throu h the in the figure of the drawing,

duct 34 into an automatic control, an

' sufiiciently by the pump,

when the pressure in this control has been built up the lever 3 will be the position shown and at such times the lever will cease to function, even though the shaft 5 continues to turn.

The automatic control means includes parts which are quite similar to the pumping means in order to facilitate manufacture and permit interchanging of the parts. For instance, the diaphragm 36 ma be secured in place in the same manner as t e diaphragm 15 and it may be of the same size as the latter and proautomatically forced into vided with similar guards and a similar abutment 37. In this instance, however, the projection 38 of one of the guards willbe engaged by one end of a tension spring 39 so that the spring in this instance will tend to pull the d1aphragm36 away from the head 23 of the lever, instead of to force the diaphragm toward the lever. The other end of the spring 39 is connectedby a swivel fastening 40 to an adjusting member 41, which may be screw threaded at 42 into a sleeve 43 w ich forms part of the casing. The chamber 44 of the control means communicates with the duct 34-by a conduit 45 so that some of the fluid pumped will always occupy the control chamber.

quired of t 'wall in one direction, and en nesneea is used for feeding gasoline, for instance, from the supply tank to the carbureter float chamber of a motor vehicle or the like,.the shaft 5 turned by the engine, will move the lever 3 in a clockwise direction whenever the float controlled valve is opened and this will cause any fluid in the chamber 25 to be forced through 30, 34 and 35 to the float chamber. As soon as the diaphragm has reached the limit of its pressure stroke, the spring 24 will immediately move it on its suction stroke and the abutment 21 will cause the lever to move in a counterclockwise direction. Of course, when the piston is on its suction stroke, fuel from the supply tank will be drawn into the chamber 25 through the pipe 27. 4

Such operation will continue as long as the float-controlled valve is open, but as soon as it closes, the liquid being no longer able to pass through the duct 45 into chamber 44 and as soon as the pressure is built up suificiently in chamber 44, the diaphragm 36 will be moved toward the right a sufiicient distance to cause the abutment 37 to bring the head 23 into the position shown in the drawing and consequently the right end of the lever will be held in such position that the cam 4 may continue to operate without actuating the lever.

It will be obvious to those skilled in the the details disclosed without departing from' through the pipe 35 will be forced the spirit of the invention as expressed in" the claims.

What I claim is:

1. In pumping mechanism, a pump having a dia hragm, resilient means for moving the diap ragm in one direction, an engine operated member for moving the diaphragm in the opposite direction, a chamber having a distortable wall, and means to permit, the fluid forced by the pump to enter said chamber and move the distortable wall into engagement with said engine operated member to hold the engine operated member in an inoperative position.

2. In pumping mechanism, a pair of opposed chambers, each having a distortable wall and said walls arranged opposite each other, valve coptrolled ducts for leading fuel into and discharging fuel from one of said chambers, a conduit placing one of said ducts in communication with the other chamber, resilient means for moving each distortable 'ne operated means having a part engagea le with said distortable walls and arranged to move one of said walls in one direction.

3. In pumping mechanism, a pair of opposed chambers, one chamber forming a pumping chamber and the other a control chamber, each chamber having a distortable wall and said walls opposing one another, inlet and outlet, means for the pumping chamber, means placing the outlet means in communication with the control chamber, and actuating means for the pump having a part arranged between the distortable walls for actuating the distortable wall of the pumping chamber and to be actuated by the distortable wall of the control chamber.

4. In a pumping mechanism, opposed pumping and control chambers, each of said chambers having a distortable wall, a duct placing the chambers in communication, means for leadin fluid to the pumping chamber and for lea ing the pumped fluid to a point of disposal, resilient means for moving the distortable wall of the pumping chamber in one direction, resilient means for moving the distortable wall of the control chamber in one direction, and operatingmeans including a part engageable with both of said distortable walls.

5. In pumping mechanism, a pump housing having a compartment therein, detachably connected rings located in the compartment,

diaphragms having their edges clamped between the rings, opposed pumpingand control chambers arranged in the housing, said diaphragms forming distortable walls for said chambers, means for admitting fluid into the pumping chamber and for discharging fluid from said chamber, means to permit pumped fluid to enter the control chamber,

and means for actuating the diaphragm of the pumping chamber, the diaphragm of the control chamber beingmovable under fluid pressure to engage the lastmentioned means for discontinuing the pumping operation.

6. In a pumping mechanism, a diaphragm pump, a member for actuating said diaphragm, a control diaphragm arranged to one side of'said member,vsaid control dia hragm being adapted to engage said mem er for holding said member in inoperative position, i

said control diaphragm being actuafd directly by the pressure exerted by the fluid of tne pump.

7. In combination with a diaphragm pump, means arranged to one side of said diaphragm for flexing said diaphragm in one direction, means for oscillating said means, a control diaphragm arranged on the other side of said diaphragm and means whereby the pressure of the fluid created directly by the pump is permitted to move the control diaphragm in position to stop the oscillation of said means.

8. Ina pumping mechanism, a pump having a diaphragm, resilient means fersmoving the diaphragm in one direction, an engine operated rocking member for moving the diaphra trol iaphragm moved b the ressure created directly by the pum a apte to engage said engine operated roc ing member for holding said member in inoperative position in the opposite direction, and a con- 9. In a pumping mechanism for feeding signature. Y

' FREDERICK PURDY.

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