US2200012A - Pneumatic pump - Google Patents

Description

y 7, 1940- L. E. RUSSELL ET AL 2,200,012

PNEUMATIC PUMP Filed April 6, 1959 2 Sheets-Sheet 1 May 7, 1940- 1.. E. RUSSELL El AL PNEUMATIC PUMP Filed Apri1'6, 1939 2 Sheets-Sheet 2 Patented May 7,1040 7 v UNITED, STATES PNEUMATIC PUMP Linus E. Russell and George E. Peters, Springfield, Ohio, assignors to Peters and Russell, Inc., Springfield, Ohio, a corporation of Ohio Application April 6, 1939, Serial No. 266,320

Claims.

This invention pertains to air or gas pumps, and more particularly to a foot operated pump especially adapted for automobile tire inflation purposes.

For convenience of storage and transportation, the pump unit is completely enclosed in a housing, which also forms the pump mount and operating means. The object of the invention is to provide a foot operated pump which may not 10 only be economically manufactured, but which will be more eiflcient in use, easily operated, uniform in action, having relatively few parts and unlikely to get out of repair.

A further and important feature of the inven- 16 tion is toprovide a pump of compact form which will be completely enclosed and wherein the enclosing housing may be utilized for operating purposes.

A further object of the invention is to provide an improved housing for the pump unit.

A further object of the invention is to provide an improved mode of mounting the pump unit.

A further object of the invention is to provide an improved mode of reciprocating the pump plunger. p

' A further object is to provide improved check valve and hose connection, and to provide hose storage when the pump is not in use;

With the above primary and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, or their equivalents, as hereinafter described or illustrated in the accompanying drawings.

Referring to the drawings, wherein is shown the preferred but obviously not necessarily the only form of embodiment of the invention, Fig.

1 is a perspective view of an assembled foot operated pump embodying the present invention growing the structure open in operating condi- Fig. 2 is a fragmentary view of a portion of the apparatus in closed condition.

' Fig. 3 is a longitudinal sectional view of the apparatus in operative condition. I V Fig. 4 is a longitudinal sectional view of the v pump cylindenpiston and hose connection.

Fig. 5 is a detail perspective view of the wrist The'present pump structure embodies a reciprocato 'y pump unit enclosed within a housing,- having a hinged closure section spring actu ated into open or-upright position, to which the pump piston is connected and which serves as a foot pedal foractuating ,the pump. Fortire inflation purposes it is desirable that the pump be compact and completely enclosed for convenient storage in the automobile when not in use. 4

As illustrated in the accompanying drawings, the pump housing comprises a pan-like base portion I formed from sheet metal, having supporting feet 2, sidewalls 3, and a bottom I. Hinged to one end of the base I is a. vertically swinging dome cover 5, preferably stamped from a single sheet metal blank. At each side contiguous to its pivotal connection the dome 5 is interiorly provided with fixedly secured angle bar reinforcements 6 which project beyond the marginal edges of the dome 5 into interior overlapping relation with the base I. Such reinforcement angle bars are preferably attached by spot welding. The rearward ends of these reinforcement bars 5 have pivotal engagement with a transverse tubular shaft I mounted in the side walls 3 of the base i. Coiled springs 8 surround each end of the shaft 1 and exert their influence to raise the cover dome away from the base I to the open position shown in Figs. 1 and 3. When in retracted position the cover dome is held against the influence of the coiled springs I by a pivotal locking bail 9 pivoted to the base I and having ofiset portions III which engage over the marginal. flange ll of' the cover' dome to lock it in closed relation.

At its front end the base I is provided with an oscillatory wall or leaf i2 hinged upon a transverse tubular shaft It for free' swinging movement. Attached to the swinging end wall i2 of the'base portion l is a pump cylinder H having therein a reciprocatory piston l5. Projecting from the cylinder I4 is a piston rod I connected with a crosshead l1 journale'd on a wrist pin I8 mounted in the sidewalls of the cover dome at mid-length thereof. The wrist ,pin is of tubular form. The crosshead I1 is formed of sheet metal, the medial portion of which is enlarged and marginally, flanged, while the extremities thereof are reduced to tubular form and enclose and have journal bearings upon the wrist pin. The construction is such that the swinging cover dome 5 comprises the operating lever or pedal for actuating the reciprocatory piston rod iii of the pump. To facilitate its use for foot operation the forward free end of the cover dome is roughened, preferably, although not necessarily, by providing therein a multiplicity of small sharp embossed points aifordinga friction area l9. g

The pump piston includes a cup leather 20 interposed between a disc 2 l and a recessed head 22. The latter has, therein an annular channel 23 of relatively large capacity which affords a reservoir for a generous supply ofj grease. -,This

til

the head of the cylinder.

grease supply will keep the cup leather in good condition over a long period of time.

The head 22 performs a further function of I increasing the volumetric displacement of the piston head, thereby increasing the compression ratio. The margin of the head 22 makes hermetically sealed contact withthe interior of the cup leather 2d and excludes air from the interior of the head or lay-passing of air under compression past the piston. The head element 22 substantially fills the recess of the cup leather and upon compression stroke of the piston serves to expel from the cylinder the residue of air which would otherwise remain in the recess of the piston head cup leather at completion of the stroke. Theresulting increase of compression ratio is quite desirable and increases the emciency of the At the outer end of the cylinder is a hose coupling for detachable engagement of the hose 24. The coupling which. also serves to attach the pump cylinder to the swing end section of the base i comprises a peripherally flanged nipple 25, both interiorly and exteriorly screw threaded, in-

, sertedthrough an opening in the head of the cylinder and through a corresponding openingv in the swinging end wall l2, exteriorly of which it is engaged by a clamp nut 26. Suitable packing 2? is interposed between the nipple flange and Detachably engaging interiorly of the nipple is a hose coupling member 28 secured to the hose 24 and having a reduced screw threaded extension. This coupling member is counterbored at 29 and receives therein a ball valve 38, an actuating spring 3| therefor, and a suitable valve seat bushing 32. The latter is preferably formed of rubber or of Duprene", but may be metal fiber or other material. The terminal end of the coupling 28 is inturned by spinning or swedging toretain the several parts therein. V

When not in use the air hose 24, after detachment from the pump, may be conveniently stored within the cover dome above the inturned flanges of the reinforcement angle bars 6.

The structure is compact, strong and con- .venient, as well as of pleasing appearance.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement'of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprise the preferred form of'several modes of putting the invention into efl'ect, and the invention istherefore claimed in any of its forms or modifications within the legitimate and valid scope of the appended clalms. V 1

Having thus described our invention, we claim: 1.- In a fluid pressure pump, a two part housing including a pan like base portion and a dome shaped cover portion hinged one to the otheradjacent one end, spring means for automatlcally retracting the dome shaped cover to open position, a pump cylinder pivotally connected to the base portion at the end opposite the hinge connection, a reciprocatory piston within the cylinder, a piston rod connected thereto and projecting beyond the cylinder, a cross-head pivotally connected at mid-length of the dome shaped cover interiorly thereof to which the piston rod is connected, the construction and arrangement being such that the piston is actuated within the cylinder by the to and fro swinging motion of the dome shaped cover and the pump is completely enclosed within the housing when the dome shaped cover is swung to closed relation with the base portion, and means for locking the dome shaped cover in its closed relation with the base portion.

2. A fluid pressure pump, including a two part housing hinged one to the other adjacent one end thereof, a spring tending to relatively move said housing parts one away from the other about their hinge .connection, a re'ciprocatory pump unit including a cylinder pivotally connected to one of the housing membersin spaced relation with the hinge connection thereof, a reciprocatory piston within the cylinder, and a piston rod connected thereto and pivotally connected with the other of the housing members in spaced relation'with the hinge connection thereof, theing members in their approach relation, said housing then completely, enclosing the pump.

3. A pump housing, including a one piece elongated dome formed from sheet material, a pan like base, a pair of reinforcement angle bars attached to the inner sides of the dome in downwardly inglined relation therewith intooverlap- I ping relation interiorly of the pan like base, a. trunnion shaft transfixing the downwardly projected ends of the angle bars and the sidewalls of the -base and, pivotally connecting the dome and base for relative swinging motion, and a retracting spring against the tension of which the dome is movable toward the base and adapted to elevate the free end of the dome relative there- 4. A pump housing, including a pan like'base, a recessed cover therefor, a pivotal connection therebetween enabling swinging motion of the cover toward and from the base, and an oscillatory end wall on said base for engagement of a pump element therewith, the construction and arrangement being such that said end wall will yield to and fro coincident with the swinging movement of the .cover to accommodate a reciprocatory pump unit interconnecting said members with each other.

5. A pump including a two part interpivoted housing, a reciprocatory pump unit comprising a pump cylinder pivotally mounted on one of said parts, and a reciprocatory piston within the cylinder and operatively connected with the other of said parts, said housing of greater length than the pump unit completely enclosing the pump unit when closed, and adapted to actuate thepump unit by the to and frojmovement of the housing parts toward and from each other.

6. A pump, including a two part interpivoted housing, a.- reciprocatory pump unit comprising a pump cylinder pivotally mounted on one of said parts, and a reciprocatory piston and stem therefor pivotally connected with the other of said housing parts, said housing completely enclosing the pump unit when closed, and adapted to actucomprising .a. medially enlarged relatively fiat laterally flanged portion to which the piston stem is attached, and integral opposite terminal tubular extension into which the marginal flanges of the medial portion gradually merge.

7. In a fluid pressure pump, a housing comprising a base portion, a dome shaped cover portion formed from a single piece of sheet material and hinged at one end to the base, areciprocatory pump unit including a cylinder portion pivotally attached to the base and a piston and piston stem pivotally connected to the dome shaped cover at a mid-length point thereof for actuation by the to and fro swinging motion of the cover, the pump unit being completely enclosed upon the approach of the dome shaped cover to the base, and a compartment in the housing to contain a detachable discharge hose when disconnected from the pump. 1

8.In a fluid pressure pump, ahousing comprising a base and a cover section interpivoted one to the other at one end, a pump unit having one element connected to the base and another to the cover for actuation by the swinging motion of the cover relative to the base, said housing being of greater length than the pump unit adapted to completely enclose the pump unit upon approach of the cover to the base.

9. In a fluid pressure pump, a housing comprising a base portion and a one piece dome shaped cover section pivotally connected to the base at one end, apum'p unit including a cylinder pivotally connected to the base portion, a reciprocatory piston and stem therefor pivotally connected to the one piece dome shaped cover at a mid-length point theroef for actuation by the to and iro motion of the cover, the housing completely enclosing the pump unit when in closed condition, and a mount for connecting the cylinder with the base, including a peripherally flanged thimble exteriorly and interiorly screw threaded extending through the cylinder head and through a portion of the housing base, a clamp nut engaging the exterior threads of the thimble, a discharge hose, an exteriorly threaded and counterbored terminal therefor engageable interiorly of the thimble, a spring, a valve; and an annular valve seat'contained in the counterbore of the terminal in abutting relation one on another, the end of the terminal being contracted over the valve seat toretain the parts in assembled relation therein.

10. A fluid pressure pump housing, including a base, and a one piece deeply recessed dome shaped cover pivotallyconnected at one end to the base, for to and fro swinging motion for actuation of an attached pump unit and of greater length than the pump unit adapted upon approach to the base to completely enclose the pump unit therein, said dome shapedcover having an outwardly projecting marginalbead, and means' for locking the dome shaped cover in closed relation with the base.

11. A fluid pressure pump housing, including a base, and a one piece deeply recessed dome shaped cover pivotally connected at one end to the base, for to and fro swinging motion for actuation hinge joint.

of an attached pump unit and of greater length than the pump unit adapted upon approach to the base to completely enclose the pump unit therein, said dome shaped cover' having an outwardly projecting marginal bead, and a swinging detent pivoted to the base and having an offset portion thereon adapted to overlap the marginal flange of the dome shaped cover to lock the latter in closed relation with the base.

12. The combination with a reciprocatory pump unit, including a cylinder and a reciprocatory piston therein of a two-part mount of suflicient size to completely surround the pump unit when closed, comprising an elongated top section and a base of substantially equal length pivotally interconnected one to the other at one end 01' the mount for relative swinging motion, a flexible coupling connecting the cylinder with one of said mount members and an operative connec-' tion between the piston and the other of the mount members, the construction and arrangement being such that when the mount is closed the pump parts are completley surrounded therethe base and cover, and a spring resisting retractive motion of the dome shaped cover toward the base, the housing being oi! size and proportions to completely enclose and conceal a pump unit therein when closed, and coupling means for operatively connecting a pump unit with the of sufficient size and proportions to completely;

surround the pump unit when in retracted relation and adapted to actuate the pump .unit by their to and fro. swinging motion about their 15. A pump, including a two part housing of sufllcient size to completely enclose a pump unit,

the parts of which housing are pivotally connected one to the other at one end thereof for relative swinging motion, a reciprocatory pump therein comprising a cylinder operatively connected with one of the housing members, a re-,

ciprocatory piston in the cylinder and a piston rod operatively connecting the piston with the other of the housing members, the construction and arrangement being such that when the housing is closed said pump parts are completely enclosed therein and when'the housing isopen one ot'the housing parts is usable as an actuating lever for operating the pump.

LINUS E. RUSSELL. oaoaon a. Pit-mas.

' base and cover for actuation by the opening and

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