US2785852A

US2785852A - Pump for pressure burner

Info

Publication number: US2785852A
Application number: US476987A
Authority: US
Inventors: Bramming Carl
Original assignee: Aladdin Industries LLC
Current assignee: Aladdin Industries LLC
Priority date: 1954-12-22
Filing date: 1954-12-22
Publication date: 1957-03-19
Anticipated expiration: 1974-03-19

Description

March 19, 1957 c. BRAMMING PUMP FOR PRESSURE BURNER Filed Dec. 22, 1954 11y VEN TOR.-

United States Patent PUNIP FOR PRESSURE BURNER Carl Brammiug, Nashviile, Tenu., assignor to Aladdin Industries, Incorporated, Nashville, Tenn., a corpora tion of Illinois Application December 22, 1954, Serial No. 47 6,987

6 Claims. (Cl. 230-160) This invention relates to a new and improved pump which is particularly, although not necessarily exclusively, useful in connection with a pressure burner and the like.

An object of the invention is to provide a new and improved pump adapted to compress air in a tank for a pressure burner or the like.

A further object of the invention is to provide a pump of the foregoing character which is operable by force exerted by a single finger or thumb of the operator.

It is another object of the invention to provide an improved burner or" the foregoing character in which the single finger or thumb, employed by the operator to operate the pump, cooperates with elements of the pump to form an air intake valve.

A further object is to provide an improved pump which is easily operated yet is effective and extremely dependable.

It is another object to provide an improved pump which is extremely simple in construction and low in cost, yet is durable and trouble-free.

Further objects and advantages of the invention will appear from the following description, taken with the accompanying drawings, in which:

Fig. 1 is an enlarged longitudinal sectional view of an exemplary pump, constituting an illustrative embodiment of the invention;

Fig. 2 is a cut-away perspective view of the pump;

Fig. 3 is an enlarged perspective view of a resilient bellows element embodied in the exemplary pump; and

Fig. 4 is a perspective view of a liner for the bellows of Fig. 3.

If the drawings are considered in greater detail, it will be seen that they illustrate an air pump 11 adapted to pressurize a tank 12, which may be the fuel tank for a pressure burner or the like (not shown). To define an expansible and contractible pump chamber 13, the pump 11 is provided with a resilient generally tubular bellows member 14 made of natural or synthetic rubber, or some other resilient rubber-like material. The expansible and contractible pump chamber 13 is further defined by a rigid member 15 serving as a valve housing, as will shortly be explained in detail. The valve housing 15 is mounted, in this instance, in a pump casing 16 which itself is mounted on the tank 12.

To receive the pump 11, an aperture 17 is formed in the upper wall portion of the tank 12. A bushing 18 is rigidly mounted in the aperture 17 to receive the pump casing 16, which is of generally cup-shaped form in the present case. Thus the casing 16 comprises a cylindrical side wall portion 19 provided with an integral lower wall or end flange 20. An axial aperture 21 is formed in the lower wall 26 to receive the valve housing 15.

To form a seal between the pump casing 16 and the bushing 18, an annular gasket 22 is mounted in a groove or channel 23 defined by a flange 24 which is provided at the upper end of the cylindrical side wall 19. In this instance, the flange 24 is of inverted L-shaped form and hence is provided with a radial portion 25 and a depend- 2,785,852 Patented Mar. 19, 1957 'ice ing portion 26. The gasket 22 is of generally rectangular cross section to fit between the L-shaped flange and the side wall 19. A rounded upper edge 27 is formed on the bushing 18 to seat against the lower face of the gasket 22.

The pump casing 16 is retained in the bushing 18, in the illustrated construction, by means of a cup-shaped collar or cap 23 having a generally cylindrical skirt portion 29 which is provided with internal threads 30 adapted to mate with an externally threaded portion 31 on the bushing. By tightening the collar 28, the casing 16 is clamped downwardly with the gasket 22 seated against the upper end of the bushing 18. It will be seen that the collar 28 is formed with a top wall or flange 32 having an axial aperture 33 to admit the upper end of the bellows member 14.

In order that the bellows member 14 may be collapsed longitudinally to contract the pump chamber 13, the bellows member is formed with a lower generally cylindrical side wall portion 34 having a plurality of annular convolutions or corrugations 35. An inturned annular mounting flange 36 is provided at the lower end of. the bellows member 14. This mounting flange 36 is adapted to be clamped between the lower wall 20 of the pump casing 16 and a downwardly facing shoulder 37 formed on the generally tubular valve housing 15, which is re-' ceived within the lower corrugated portion of the bellows member. In this instance the shoulder 37 is provided by an external flange 38 formed on the valve housing 15. Below the flange 38, the valve housing 15 has a cylindrical portion 39 extending through an axial aperture 40, defined by the flange 36 on the bellows member 14. Below the flange 36, the cylindrical portion 39 extend into the aperture 21 in the lower wall 20 of the casing 16.

The valve housing 15 is drawn downwardly against the flange 36 on the bellows member 14 by means of a tubular retaining element 41. A head or flange 42 is formed on the lower end of the retaining element 41 for engagement with the underside of the lower wall 20. External threads 43 on the tubular retaining member 41 are adapted to mate with internal threads 44 formed in the valve housing 15. An axial air outlet passage 45 extends through the retainer 41.

At the upper end of the bellows element 14, the corrugated lower wall portion 34 is surmounted by a substantially cylindrical upper wall portion 46 which projects through the cap 28 and thus acts a a manually operable piston or plunger. An external shoulder 47 is formed on the cylindrical wall portion 46 to engage the lower side of the cap 28 and thereby limit upward expansion of the bellows member 14. It will be understood that the inherent resiliency of the corrugated lower wall portion 34 tends to bias the bellows member upwardly.

Within the bellows member 14, the upper cylindrical wall portion 46 is reinforced by a rigid, generally cylindrical liner 46 which may be made of metal. An integral external flange 49 is formed on the lower end of the liner to retain the liner within the bellows 14 against longitudinal movement. It will be seen that an internal annular groove 50 is formed in the bellows member 14 just below the shoulder 47 to receive the flange 49. The liner 48 fits snugly within the cylindrical side wall portion 46 of the bellows member 14.

At the upper end of the bellows member 14, the cylindrical side wall portion 46 is surmounted by an end wall 51 engageable by a single digit of the operator. The cup-shaped depression or recess 52 is formed in the top of the end wall 51 to receive the digit.

To admit air to the expansible and contractible pump chamber 13, an inlet port 53 is arranged to extend through the top wall 51 of the bellows member 14, the port being axially disposed in the top wall in this instance. It will be understood that the port 53 is adapted to be closed by the operators digit when the bellows member 14 is engaged and pushed downwardly by the operator. Thus the operators digit prevents escape of air through the inlet port 53, with the result that the digit cooperates with the port and the end wall 51 to form an inlet valve. When the bellows member 14 has been fully depressed and the digit is withdrawn from the end wall 51, the inlet port 53 is opened so that air may enter the pump chamber 13. The bellows member 14 returns upwardly by virtue of the inherent resiliency of the corrugated lower wall portion 34.

It will be seen that the liner 48 is adapted to be loosely received over a cylindrical surface 54 on the outside of the valve housing 15. Thus the action of the liner and the valve housing guides the bellows member 14 in its upward and downward movement.

Compressed air passes out of the pump chamber 13 through an air outlet port 55 defined by an internal fiange 56 at the upper end of the valve housing 15. The air passes through the hollow valve housing and the air passage 45 in the retainer 41 and thence into the tank 12.

To prevent return of air from the tank into the pump chamber 13, a check valve 57 is provided within the valve housing 15. It will be seen that the illustrated check valve is cylindrical in shape and is provided with a discshaped sealing member 58 seated in a recess 59 formed in the upper end of the valve 57. The sealing member 58 is adapted to seat against a conically shaped valve seat 59 formed on the lower side of the flange 56. The check valve 57 is biased upwardly toward the seat 59 by means of a compression spring 60 disposed between the valve 57 and the retaining element 41.

When the operator applies his finger or thumb to the upper end of the bellows member 14 and pushes downwardly, the inlet port 53 is closed by the digit and the outlet valve 57 is unseated by the pressure developed in the chamber 13 as the bellows is collapsed longitudinally. At the bottom of the stroke, the operator releases his finger or thumb from the bellows member 14 so as to open the inlet port 53 and permit the bellows member to return upwardly by its own resiliency. It will be recognized that the arrangement of the inlet port is such as to eliminate any need for an inlet valve.

The illustrated pump comprises a minimum number of parts and is extremely simple in construction. Accordingly, the entire pump may be manufactured at a minimum cost. Moreover, the pump may be made extremely small in size. Nevertheless, the pump is capable of developing several pounds per square inch of pressure in the tank 12 and hence is ideally suited for use on a pressure burner, Where even a few ounces of pressure will usually suflice. The pump is thoroughly dependable, leak-proof and trouble-free.

Various modifications, alternative constructions, and equivalents may be employed without departing from the true spirit and scope of the invention as exemplified in the foregoing description and defined in the following claims.

I claim:

1. A pump adapted to be mounted on an externally threaded bushing, said pump comprising a generally cupshaped pump casing adapted to be received within said bushing and having an outwardly and downwardly extending generally inverted L-shaped annular flange on the upper end of said casing defining a downwardly facing channel therearound, a gasket ring in said channel and adapted to engage the upper end of said bushing, an internally threaded cap adapted to be received on the upper end of said bushing for clamping said casing downwardly with said gasket against said bushing, a resilient rubberlike tubular bellows member received within said casing and having a lower side wall portion with a plurality of annular corrugations, said bellows member having an inturned annular flange at its lower end, a tubular valve housing received within said lower side wall portion and having an outwardly extending flange adjacent its lower end, said pump casing having a lower wall with an axial aperture, a tubular retaining member extending through said aperture in said pump casing and threaded into the lower end of said valve housing and having a head engaging the lower side of said lower wall to draw said valve housing downwardly and thereby clamp said inturned flange of said bellows member between said lower wail and said outwardly extending flange of said valve housing, said valve housing having an upper end wall with an axial outlet port therethrough, a check valve member within said valve housing and movable over the lower end of said port, a spring between said check valve member and said retaining member for biasing said check valve member toward its closed position over said port, said cap having a top wall with an axial aperture therethrough, said rubber-like bellows member having a generally cylindrical upper side wall portion extending through said aperture in said cap and surmounted by an upper end wall portion, said upper side wall portion having an external flange engageable with said cap to limit upward expansion of said bellows member, and a rigid tubular liner received within said upper side wall portion and receivable over said valve housing, said upper end wall portion of said bellows member having an axial valve aperture adapted to be closed by a digit of the operator in pushing said bellows member downwardly.

2. A pump, comprising a generally cylindrical pump casing, a resilient rubber-like tubular bellows member received within said casing and having a lower side wall portion with a plurality of annular corrugations, said bellows member having an inturned annular flange at its lower end, a tubular valve housing received within said lower side wall portion and having a downwardly facing shoulder adjacent its lower end, said pump casing having a lower wall with an axial aperture, said pump casing having upper wall means with an axial opening therein, a tubular retaining member extending through said axial aperture in said lower wall of said pump casing and threaded into the lower end of said valve housing and having a head engaging the lower side of said lower wall to draw said valve housing downwardly and thereby clamp said inturned flange of said bellows member between said lower wall and said shoulder, said valve housing having an upper end wall with an axial outlet port therethrough, a check valve member within said valve housing and movable over the lower end of said port, a spring between said check valve member and said retaining member for biasing said check valve member toward its closed position over said port, said rubber-like bellows member having a generally cylindrical upper side wall portion extending through said axial opening in said upper wall means and surmounted by an upper end wall portion, and a rigid tubular liner received within said upper side wall portion and receivable over said valve housing, said upper end wall portion of said bellows member having an axial valve aperture adapted to be closed by a human digit in pushing said bellows member downa wardly to actuate said pump.

3. A pump, comprising a resilient rubber-like tubular bellows member having a lower side wall portion with a plurality of annular corrugations, a tubular combined valve housing and guide received within said lower side wall portion in concentric closely spaced guiding relation thereto, means seeming the lower end of said bellows member to said combined valve housing and guide in sealing relation thereto, said combined valve housing and guide having an upper end wall with an axial outlet port therethrough, a check valve member within said combined valve housing and guide and movable over the lower end of said port, a spring in said combined valve housing and guide and biasing said check valve member toward its closed position over said port, said rubberlike bellows member having a generally cylindrical upper side wall portion, and a rigid tubular liner received within said upper side wall portion and receivable over said combined valve housing and guide, said upper end wall portion of said bellows member having an axial valve aperture adapted to be closed by a human digit in pushing said bellows member downwardly.

4. A pump, comprising a resilient rubber-like tubular bellows member having a lower side wall portion with a plurality of annular corrugations, a tubular combined valve housing and guide received within said lower side wall portion in concentric closely spaced guiding relation thereto, means securing the lower end of said bellows member to said combined valve housing and guide in sealing relation thereto, said combined valve housing and guide having an upper end wall with an axial outlet port therethrough, a check valve member within said combined valve housing and guide and movable over the lower end of said port, a spring in said combined valve housing and guide and biasing said check valve member toward its closed position over said port, said rubberlike bellows member having an upper end wall with a generally axial inlet port therethrough for closure by a human digit in pushing said bellows member downwardly.

5. A pump adapted to be mounted on an externally threaded bushing, said pump comprising a generally cupshaped pump casing adapted to be received within said bushing and having an external annular flange on the upper end thereof, a gasket ring under said flange and adapted to engage the upper end of said bushing, an internally threaded cap adapted to be received on the upper end of said bushing for clamping said casing downwardly with said gasket against said bushing, said casing having an apertured lower wall, a resilient rubber-like tubular bellows member received within said casing and having a longitudinally collapsible lower side wall portion with a plurality of annular corrugations, said bellows member having an inturned annular flange at its lower end, a hollow valve housing received within said lower side wall portion, means for mounting said valve housing on said lower casing wall with said inturned flange of said bellows member clamped between said valve housing and said lower casing wall, said valve housing having an upper end wall with an axial outlet port therethrough, a check valve member within said valve housing and movable over the lower end of said port, a spring in said valve member and biasing said check valve member toward its closed position over said port, said cap having a top wall with an axial aperture therethrough, said rubber-like bellows mem her having a generally cylindrical upper side wall portion extending through said aperture in said cap and surmounted by an upper end wall portion, said upper side wall portion having an external flange engageable with said cap to limit upward expansion of said bellows member, and a rigid tubular liner received within said upper side wall portion and receivable over said valve housing, said upper end wall portion of said bellows member having an axial inlet port therethrough adapted to be closed by a human digit in collapsing said bellows member.

6. A pump, comprising a generally cylindrical pump casing, a resilient rubber-like tubular bellows member received within said casing and having a lower side wall portion with a plurality of annular corrugations, said bellows member having an inturned annular flange at its lower end, a tubular valve housing received within said lower side wall portion and having a downwardly facing shoulder adjacent its lower end, said pump casing having a lower wall with an axial aperture, said pump casing having upper wall means with an axial opening therein, a tubular retaining member extending through said axial aperture in said lower wall of said pump casing and threaded into the lower end of said valve housing and having a head engaging the lower side of said lower wall to draw said valve housing downwardly and thereby clamp said inturned flange of said bellows member between said lower wall and said shoulder, said valve housing having an upper end wall with an axial outlet port therethrough, a check valve member within said valve housing and movable over the lower end of said port, a spring between said check valve member and said retaining member for biasing said check valve member toward its closed position over said port, said rubber-like bellows member having a generally cylindrical upper side wall portion extending through said axial opening in said upper wall means and surmounted by an upper end wall portion, and a rigid tubular liner received within said upper side wall portion and receivable over said valve housing, said liner having an external annular flange at its lower end, said bellows member having an internal annular groove for receiving said flange on said liner, said upper end wall portion of said bellows member having an axial valve aperture adapted to be closed by a human digit in pushing'said bellows member downwardly to actuate said pump.

References Cited in the file of this patent UNITED STATES PATENTS 105,890 Bennett Aug. 2, 1870 285,477 Garsed Sept. 25, 1883 330,221 Garsed Nov. 10, 1885 738,518 Bernz Sept. 8, 1903 1,030,465 Flitcroft June 25, 1912 2,701,672 Glasco Feb. 2, 1955