US960789A - Air-pump. - Google Patents

Description

U. H. BELDEN.

AIR PUMP.

APPLICATION FILED JUNE 22, 1909.

960,789, Patented June '7, 1910.

ANDREW B. GRAHAM cu. PHOTO-UTHOCRAFNERS WASHINGTON. DA:

CHARLES H. BELDEN, 0F CLIFTON SPRINGS, NEW YORK,

AIR-PUMP.

Specification of Letters Patent.

Patented June 7, 1910.

Application filed June 22, 1909. Serial No. 503,738.

To all whom it may concern:

Be it known that I, OHARLns H. BELDEN, of Clifton Springs, in the county of Ontario and State of New York, have'invented a new and useful Improvement in Air lPumps, which improvement is fully set forth in the following specification and shown in the accompanying drawings.

This invention relates to certain new and useful improvements in air pumps, and more particularly to that class designed primarily for inflating pneumatic tires.

In this class of pumps as heretofore constructed, the operating handle is liable to become loose from use, and the construction of the pump has been such that this looseness of the handle and the parts immediately associated therewith has caused a leak at the upper end of the barrel which has been annoying.

One of the objects of the present invention is to overcome this objection. In my present improvement the construction is such that if the handle gets loose, it has no effect whatever upon the joint at the handleend of the pump.

Another object of the invention is to simplify and improve the construction of the pump, making it practically a two-barrel pump, yet capable of doing the same work as has been done by the known forms of triple-barrel pump designed for this purose.

p Other objects and advantages of the invention will hereinafter appear and the novel features thereof will be particularly pointed out in the appended claims.

The invention is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which Figure l is a side elevation of my improved pump with portions broken away ancl parts in section. Fig. 2 is a side elevation, on an enlarged scale, with portions omitted, parts broken away and various parts shown in section. Fig. 3 is a cross section of the main barrel on the dotted line a in Fig. 2, the upper portions being omitted and the plunger rod shown in cross section, as on the dotted line b in Fig. 4:, looking in the direction of the arrows. Fig. 4 is a side elevation of parts at the upper end of the inner barrel, parts being broken away and portions shown in section. Fig. 5 is a plan of parts at the upper end of the inner barrel, the cap being omitted and the plunger rod being transversely sectioned, as on the dotted line 0 in Fig. 41, looking in the direction of the arrow, a portion of the cage being broken away. Fig. 6 is a side elevation of the cage, detached. Fig. 7 is a substantially central longitudinal section of the cage and some of the associated parts, showing the disk valves and the actuating spring therefor, the plunger rod being shown in elevation.

Like numerals of reference indicate like parts throughout the several views.

Referring to the drawings, 1 is the main barrel of the pump.

2 is a head secured rigidly to the upper end of said barrel in any suitable manner, being pierced centrally for the passage of the upper reduced threaded end 8 of the plunger rod 4. This rod is formed with an inclined or conical shoulder 5, seen clearly in Figs. 2, 3 and 4, which meets the inner surface of the closing cap or head 2, as seen clearly in Fig. 2, when the parts are together. A screw nut 6 on the threaded end 3 of the rod 4: is turned down tightly against the raised central portion 7 of the cap 2, as seen in Figs. 1 and 2. When thus screwed down rigidly to place, the barrel 1 and the rod 4, with connected parts, all move as a single body when the pump is being operated. This beveled shoulder 5,fitting as it does tightly against the inner circular cornor 8 of the cap 2 when the nut is tightened, forms an air-tight joint, which is an important feature of the construction, as will be hereinafter more fully set forth.

9 is the handle. It is of the form usual in such devices, being slipped on the outer end of the rod 4 after the nut 6 has been tightened firmly to place so as to make the joint between the rod and the cap perpetually tight independent of the handle, the handle then being secured by means of a nut 10,- as seen in Fig. 1, the handle being held down against the nut 6 but entirely independent of the latter so far as loosening its hold upon the cap 2 is concerned. Suitable washers, as 11 and 12, may sometimes be employed if desired between the handle and the nuts 6 and 10, although this is not' considered essential.

13 is a stirrup at the lower end of the pump, the pump being designed for use in a vertical position with the foot upon the stirrup to hold the pump rigidly in place while operating the same, the upward and downward motions of the handle 9 carrying the outer barrel 1 and the plunger rod 4 upward and downward as a single element.

14 is the inner barrel. It is provided near its upper end with a base ring 15 threaded thereon and holding a fibrous or leather cup 16, of any well-known or preferred construction, a ca ring 17 being threaded on its extreme end. ithin the upper end of the barrel 14 is inserted a cage 18, seen detached in Fig. 6, the same being provided with a flange 19 resting directly upon the upper end of the barrel and immediately closing the same, the flange and the barrel having the same diameter. This cage is further formed with an annular band or portion 20 immediately beneath the flange 19 which also fits closely to the interior of the inner barrel 14. Below this portion 20, the cage is reduced in external diameter, as seen at 21 in Figs. 6 and 7, leaving a narrow space all around the same between it and the inner surface of the barrel, as seen clearly at 22 in Fig. 4. This cage is also formed with openings 23, as seen in Figs. 4 and 6, for the passage of air into the barrel, as will be explained as the description proceeds. ithin this cage is placed a disk valve or the like 24 of suitable material, preferably soft yielding leather saturated with oil or other lubricant, beneath which is a slender spring 25 normally holding the packing material upward at the mouth of the cage. The lower end of this spring bears against the inner wall of the bottom of the cage, as will be readily understood upon reference to Fig. 7. As seen in Fig. 7, the valve may comprise a plurality of rings or layers, if found desirable.- The upper end of the cage is directly pressed by the cap or part 17, the latter being screwed down firmly against the cage. The part 17 is formed slightly concave within, as shown at 26, against which the valve 24 is normally mildly pressed by the slender spring 25, as seen in Figs. 4 and 7.

As shown in Figs. 3, 4 and 7, there is an annular space 27 between the rod 4 and the opposing inner portion of the part 17 down through which air may pass. Also the valve 24 is less in diameter than the interior of the cage, leaving an annular space 28 all around through which air may flow to the interior of the cage, see Figs. 5 and 7. The valve 24, being very soft and yielding, takes the form of a small cone 31, shown in Figs.

4, 5 and 7, fitting the slightly conical form' 26 on the interior of the part 17 this conical part 31 being at the top of the valve, and a mere ring, as shown. The lower part or section 32, Fig. 7, with the valve 24, is an ordinary metal or iron washer against which the spring 25 directly presses, the valve 24 being between this ring or washer and the inner surface of the part 17.

\Vhen into the interior of the cage, the air may flow freely outward through the two openings 23, thence downward along the outside of the cage into the barrel 14, as indicated by numerous arrows in Fig. 4.

Now it remains only to describe the working of the parts within the barrel 14. The lower end of the rod 4 is provided with a cup-leather 33, Fig. 2, in principle the same as the cup-leather 16 at the top end of the barrel 14, which, when the handle 9 is pulled upward, passes idly upward through the compressed air in the barrel 14, the air passing readily downward by and past the yielding cup-leather 33. But, when the handle is pressed downward, the air in the barrel 14 below the cup-leather 33, not being able to escape'upward by or past the cupleather 33, will be forced downward into the chamber 34 of the stirrup 13 and so outward through the short bent tube 35. This delivery tube is of common construction, a hose being attached to it and connected with the tire to be inflated, all in the lsual manner.

There is a check valve in the bent tube of usual construction (not shown) to prevent the air from passing backward into the pump when the handle 9 is again drawn upward. A spring 36, Fig. 2, is shown on the rod above the cup-leather 33, which acts as a sort of a buffing spring to strike the lower end of the cage when the rod is pulled upward. A closing head 37 is threaded upon the lower end of the barrel 1 which, when the pump is worked, glides smoothly along the outer surface of the tube 14, the latter being rigid and stationary.

From the above, it will be understood that, (assuming the pump in the position shown in Fig. 1) when the handle 9 is drawn upward, the space 29 in the barrel 14 above the cup-leather 16 of the barrel 14, will fill with air drawn inward through openings near the bottom end of the barrel 1, one being shown at 30, Fig. 1, and passing upward by the cup-leather16 which, in this action of the parts, yields inwardly to allow the air to pass into the upper end of the barrel 1 above the cup-leather 16.

When the handle is pressed downward, the air in the barrel 1 above the cup-leather 16, not being permitted to pass downward by the cup-leather 16, will be forced through the circular opening 27 of the part 17 around the rod 4. This pressure of the air against the valve 24 will force that slightly down ward away from the concavity 26 against the action of the spring 25 and so open a continuous air passage into the cage and thence into the barrel 14, as above described and indicated in Fig. 4. Thus, the interior of the barrel 14 will be filled with air compressed by the forcing downward of the again drawn upward, the air in the barrel 14 cannot escape back through the cage as the spring 25 immediately forces the valve 24 snugly against the concave seat thereof against the part 17 The lower end of the barrel 14 is threaded into the chamber 34, in the head of the base piece or stirrup 13, leaving space beneath for the outflow of the forced air into the tube 35. When the operator of the pump gets his weight onto the handle 9 to force the outer barrel 1 and the rod 4 downward, he is simultaneously operating two pumps, as it were, the outer pump forcing air into the inner barrel, and the cup-1eather 38 forcing air already compressed in said barrel into the tire.

Modifications in detail may be resorted to without departing from the spirit of the invention or sacrificing any of its advantages.

IVhat is claimed as new is 1. In a pump of the class described, the combination with the inner barrel and the plun er rod, of a cage having openings and annu ar portions of different diameters, a valve within the cage, and a cap on the upper end of the cage, there being a space provided between the cage and barrel and a space between said valve and cage and a space surrounding said rod for the passage of air.

2. In a pump of the character described, the combination with the inner barrel and the plunger rod, of a cage having annular portions of different diameters and openings, a valve, a spring within the same acting on the valve, and a cap at the upper end of the cage having a concaved portion receiving said valve, there being an annular space between said rod and the opposing inner portion of said cap and a space between the valve and cage.

8. In a pump of the character described, the combination with the inner barrel and the plunger rod, of a cage having openings, a valve, a spring w1th1n the same acting on the valve, and a cap at the upper end of the cage having a concaved portion receiving said valve, said valve being elastic and having a conical upper end there being an annular space between said rod and the opposing inner portion of said cap, said valve being of less diameter than the interior of the cage.

4:. In a pump of the character described, the combination with the inner barrel and the plunger rod, of a cage having openings and annular portions of different diameters, a cap over the upper end of the cage, and a spring-pressed valve within the cage, there being a space between the cage and barrel and a space between the valve and cage and a further space between the rod and the walls of the cap through which it passes, for the passage of air.

In witness whereof, I have hereunto set my hand this 18th day of June, 1909, in the presence of two subscribing witnesses.

CHARLES H. BELDEN.

IVitnesses .AL'rA E. KnLLocc, EMBUKY J. BEAL.

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