US1762114A

US1762114A - Axbbbt b

Info

Publication number: US1762114A
Authority: US
Publication date: 1930-06-03
Anticipated expiration: 1947-06-03

Description

June 3, 1930. BERDON 1,762,114

LIQUID FUEL PUMP Original Filed April 12, 1927 ;A r. g $45.2.

r 1 WW 6 U 10 l 11 9 f/ f I 2 i 30 k j INVENTOR. 4 29 flaw/1J6 5523M Patented June 3, 1930 UNITED STATES PATENT, OFFICE Anna E. BER-DON, OF DETROIT, MICHIGAN, ASSIGNOB TO A. SPARK PLUG COMPANY,

OI FLINT, MICHIGAN, A COMPANY OF MICHIGAN LIQUID-FUEL PUMP Original application flied April 18, 1927, Serial No. 188,103. Divided and this application filed February 4, 1928. Serial No. 251,802.

This invention relates to fluid pumps and particularly to pumps for supplying liquid el to internal combustion engines and other fuel consuming and receiving devices. The present application is a division of application 183,103, issued asPatent 1,647,768, November 1st, 1927. r

The special objects of this invention are to provide a fuel pump,capable of delivering the liquid at an appreciable pressure, which will be self-regulating in its operation and which will be of relatively simple, inexpensive, durable construction.

These and further desirable objects are attained by certain novel features of construction, combinations and relations of parts as hereinafter described, illustrated and broadly claimed.

The drawing accom anying and forming part of the specificati illustrates a practical embodiment of the invention, this structure exemplifying, however, rather than limiting the precise orm in which the invention ma be embodied. as igure 1 is a vertical sectional view of the Figure 2 1s a broken part sectional view taken at the left of Figure 1, the sectional portion as on line 22 of that figure. I so The body of the pump shown comprises a base structure 3 havin a valved inlet 4 and a valved outlet 5, said iase carrying a pump cylinder 6 with which the valved inletand outlet ports communicate by passages 7 8.

The pumping element is made up of two relativel movable portions, a piston 9 and a surroun ing sleeve 10 having an annular lower face 11 exposed to the pressure in the 1 pump chamber. This main and supplementary piston have close fitting oversliding enagement, one relative to the other and with- 111 the cyhnder, piston rings such as indicated at 12 being usually provided to effect a pro er seal between these parts.

tuated by a screw rod 13 engaged atits outer end with a screw seat 14 in the yoke 15 which is ivoted at 16 to an intermediate portion of ever 17, which lever has a fulcrum 18 at 80 one end supported from the pump base and e main piston is shown as positively achas a fork'19 at its opposite end engaged by a cam or eccentric 20 on an actuating shaft 'Assuming the main piston to be the positively actuated piston, the sleeve or supplementary or auxiliary piston 10 has an impositive movement, the stroke of which is governed by the pressure in the pump chamber. This impositive connection may be provided by the

springs

22, 23, surrounding the pump rod 13 and bearing against Washers 31 32, which engage the outer and inner faces of the head of the sleeve piston. The

washers

31, 32 are positioned by bearing against a stop collar 24 fixed on the pump rod and the tensions of the two springs are independentlfy adjustable by

nuts

25, 26 on the rod which orm the outer abutments for the springs.

The head or top portion of the outer piston element is shown as left open as by providing perforations 27 therein for escape and entrance of air during relative movements of the

piston parts

9 and 10 and to provide ac Bass for adjustment of the lower abutment nut The valves for the inlet and discharge ports may be constructed after the manner shown in Fi re 2, consisting in each instance simply o a light disc 28 held to its seat 29 by a spring 30 the

passages

7 and 8 of the inlet and outlet being arranged in back of and in front of the valve respectively so that the valves will properly control the inlet and outlet functions.

The recipiocation of the main or central piston mem r is positive and constant while that of the supplementary piston member is impositive and variable in accordance with pressure in the pump chamber. The tension of the

springs

22, 23 governs the extent to which the sleeve piston will follow the main piston and the pressure at which it will assert its own inde endence of movement. These springs may e adjusted without disassembly of any of the parts and hence the action ofthe pump may be accurately regulated or altered to suit existing conditions at any time. Usually the sleeve piston may be tensioned to travel in unison with the main piston while conditions are normal so as to get the benefit of the full combined pumpin area of both piston elements. Then, under a normal conditions, with change of pressure from the normal, the piston elements will not travel in unison, but one will yield relative to the other to accommodate for the change in pressure.

With this construction it is possible that one piston element may move in a direction opposite to the direction of movement of the other part. The construction described enables the pump to supply the liquid at a desired pressure, to regulate itself automatically and to accommodate itself to extreme conditions such as the closing of the inlet or of the outlet. On the closing of the inlet, the sleeve piston, under external pressure, might remain stationary or actually travel inwardly while the positively actuated piston is on its outward stroke. The conditions would be reversed with the closing of the outlet and then the sleeve piston might remain stationary or actually move-outwardly while the positive piston is travelling inwardly. The osition where the stop collar 24 is secure on the pump rod fixes the normal relation of the sleeve piston to the inner iston and the adjustment of the pump rod in the screw seat 14 determines the innermost position of the two pistons and hence the minimum clearance in the pump chamber. By various adjustments of these parts and by adjustment of the tension of

springs

22, 23, the pum may be made to perform to suit many di erent requirements. The abutment washers 31, 32 for the inner ends of the springs are clear of the pump rod 13 so that they may freely leave the abutment or posi tioning collar 24 under abnormal pressure conditions. When the pump rod 13 is adjusted in the screw seat 14 to predetermine the terminus of the unitary movement of the pistons, the same may be secured in the desired adjustment by the lock nut 33.

What is claimed is:

1. In a pump of the character disclosed, a pump cylinder having valved inlet and outlet ports, a sleeve piston operating in the cylinder and a piston operable in said sleeve piston, said pistons having piston faces exposed in the chamber of the cylinder and ointly coo erative to provide a maximum pumping e ect and actuating means for said pistons operable to enable movement of said pistons relative to each other in opposite directions to reduce the resultant pumping effects of said pistons in both directions of the pumping strokes.

2. In a pump of the character disclosed, a pump cylinder having valved inlet and outlet ports, a sleeve piston operating in the cylinder, a piston operative in said sleeve piston, both pistons having pum faces exposed to the chamber of the cylin er, a positive actuating connection to one of said pistons and two opposed yielding impositive actuating connections to the other piston enabling said latter piston to follow in either direction to a greater or less extent the pumping strokes of the first piston.

3. A pump comprising a pump cylinder having valved inlet and outlet ports, a sleeve piston provided with a head and operating in said cylinder and having an exposed annular piston face, a piston operative in said sleeve piston, a constant stroke connecting means to one of said pistons, and resilient connecting means to the other of said pistons,one of said connecting means comprising springs which act oppositely upon said head, to permit one of said pistons to lag relatively to the other.

4. A pump comprising a pump cylinder having valved inlet and outlet ports, telescopically related pistons working in said cylinder, means including a plurality of oppositely acting springs for effecting a unitary and a differential operation of said pistons and means for variably predetermining the terminus of the stroke in the unitary movement of the two pistons.

5. A pump comprising a pump cylinder having valved inlet and outlet ports, pistons operating in telescopic relation in said cylinder, means for effecting a combined unitary and differential action of the pistons in the cylinder, including resilient coupling means between the pistons, said coupling means being adjustable in opposite directions to predetermine either way the initial positions of the pistons relative to each other.

6. A pump comprising a pump cylinder having valved inlet and outlet ports, a sleeve piston operating in the cylinder, a piston operating in said sleeve piston, a pump rod connected with said latter piston, a collar on said rod, loose washers on the rod at opposite sides of said collar and having engagement with the sleeve piston, springs surrounding the rod and hearing at their inner ends on said Washers, abutments on the rod for the outer ends of said springs and means for reciprocating the pump rod.

7. A pump comprising a pump cylinder having valved inlet and outlet, a sleeve piston operating in the cylinder, :1. piston operating in said sleeve piston, a pump rod having an adjustable positive drive connection with the latter piston and oppositely acting spring connections from the pump rod to the sleeve piston yieldable in the opposite directions of movement of the pump rod to enable the sleeve piston to lag behind the inside piston in the pumping action either way.

8. A pump comprising: a pump cylinder having a valved inlet and a valved outlet; a sleeve piston operating in the cylinder; an additional piston operating within said sleeve piston; a pump rod having an adjustable positive drive connection with one of said pistons; and oppositely acting spring connections therefrom to the other iston,said spring connections being yieldab e in opposite directions of movement of the pump rod to enable the last-mentioned piston to lag behind the positively driven piston and the said pump rod.

In testimony whereof I aflix my signature.

ALBERT E. BERDON.