US2792170A

US2792170A - Compressor

Info

Publication number: US2792170A
Application number: US364726A
Authority: US
Inventors: Robert C Hudson; John E Oys; August H Pinke
Original assignee: HD Hudson Manufacturing Co
Current assignee: HD Hudson Manufacturing Co
Priority date: 1953-06-29
Filing date: 1953-06-29
Publication date: 1957-05-14
Anticipated expiration: 1974-05-14

Description

May 14, 1957 R. C. HUDSON ET AL 2,792,170

COMPRESSOR Filed June 29, 1955 werf 052%@ n @45.

6 Claims. (Cl. 2330-196) The present invention relates to a compressor comprising a pump barrel and a plunger for supplying air under pressure, and more particularly to a novel plunger and cup-like packing assembly adapted to be reciprocated in the pump barrel and when the plunger reaches the limit of its forward movement the packing is expanded in such manner as to maintain the leather or composition of the packing supple and to prolong its life or period of usefulness, as well as assure optimum effectiveness in operation.

Among the objects of 'the present invention is the provision of a novel cup-like packing mounted on the end of a plunger or piston rod in such manner as to be springbiased toward expanded position.

A further object of the present invention is the provision of a novel means and manner of detachably mounting a cup-like packing on the end of a plunger or piston rod whereby the packing may be quickly and easily assembled, removed or replaced, all without the necessity or use of any tools.

The present invention further comprehends the provision in a compressor or pump assembly of a detachable cup-like packing and a resilient mounting for retaining the cup-like packing in assembled relation, and when assembled this mounting functioning also to expand or spring-bias the annular ange of the packing in such manner as to maintain it in continuous wiping and sealing Contact with the interior of the pump barrel.

ln the present embodiment, the forward or discharge end of the barrel or pump cylinder is flared or enlarged to receive and maintain the liange of the packing expanded beyond the normal internal diameter of the barrel by a plurality of spring fingers or resilient projections arranged in spaced relation on the retaining member or mounting.

Further objects are to provide a construction of maximum simplicity, efiiciency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

In the drawings:

Figure l is a view iu side elevation of one form of compression sprayer in which is shown embodied the present novel compressor, a portion of the tank or container of the sprayer being broken away to show the lower end of the pump barrel or cylinder of the compressor and in dotted outline its plunger rod and pump packing.

Fig. 2 is a fragmentary enlarged View in 'vertical cross section through the lower end of the pump barrel and the novel plunger or piston assembly, including the novel means and manner of detachably mounting the cup-like packing on the lower or inner end of the plunger or piston rod and maintaining the sealing flange of this cup-like packing expanded in conformity with the internal diameter of the pump barrel or cylinder, the view showing the end of the plunger rod and the cup-like packing near the end of the compression stroke and spaced from the discharge end of the pump.

Fig. 3 is a fragmentary enlarged View similar to Fig. 2

l 2,792,170 Patented May lll, E?

but showing the cup-like packing moved to approximately the limit of its forward or compression stroke, or when the pump is not in operation, at which time the flanged end of the packing is expanded in conformity with the enlarged diameter of the pump barrel.

Fig. 4 is a View in horizontal cross section taken in a plane represented by the line 4-4 of Fig. 2 and viewed in the direction of the arrows.

Fig. 5 is a view in horizontal cross section taken in a plane represented by the line 5 5 of Fig. 2 and viewed in the direction of the arrows.

Fig. 6 is a bottom plan view of the detachable mounting for the cup-like packing and showing its circumferentially spaced spring lingers or projections for spring-loading or spring-biasing the flanged end of the cup-like packing toward expanded position.

Referring to the detailed disclosure in the various views of the drawing in which the present invention is embodied in a compression sprayer 10, it is to be understood that the present novel compressor is not limited thereto but is adapted to and comprehends employment in various types of sprayers or wherever a compressor or pump is required or adaptable for use.

The compression sprayer lil includes a tank or container il adapted to receive a substantial quantity of a liquid or spray solution to be sprayed or dispensed through a discharge tube or outlet i2. Mounted in the tank is a compressor or pump i3 including a pump barrel or cylinder i4 of substantially uniform diameter throughout the greater portion of its length and at its discharge end flared or expanded outwardly at l to provide a portion of somewhat greater diameter.

ln the illustrative embodiment, the pump barrel ld at its discharge end is provided with an end cap lo having a depressed central portion i7 provided with an opening or discharge passage for the air under pressure, and an outwardly and forwardly dared or tapered wall i8 having its flanged outer end i9 press-tted into and suitably anchored or secured within the end i5 of the pump barrel. A hollow and externally threaded plug Zi (Fig. 2) is secured in the opening in the depressed central portion i7 and adapted to receive a housing 22 for a pump valve 23 spring-biased toward closed position by a spring 24. This valve 23 carries a gasket 25 adapted to be moved into sealing engagement against a tapered lip of a valve seat 26. The valve housing 22 is provided with one or more discharge openings 27 for the passage therethrough of air on the compression stroke of the pump at which time the Valve 23 is opened against the expanding or compression spring 2d.

Mounted on the end of a plunger or piston rod 2S is a cup-like packing 29 having 'a depending or outwardly projecting dared portion or annular flange 31 adapted to be maintained in continuous wiping and sealing contact with the interior wall of the pump barrel or cylinder ifi as the plunger rod 28 is reciprocated by its handle 3l) for supplying air under pressure to the interior of the tank -or container l1. The cup-like packing 29 is provided with a relatively large, centrally disposed opening adapted to receive a central embossment on a washer 32 aixed to the plunger rod 28 at a point spaced from its lower or inner end $3 and also affixed to this end of the plunger rod but in spaced relation with the washer 32 is a substantially smaller washer 34.

To detachably mount the cup-like packing 2S onto the end of the plunger rod` 28 and also to retain the flange 3l thereof expanded against the encompassing internai wall of 'the pump barrel or container id is a substantially cup-shaped retainer 35 having a key slot 36 in the base thereof extending from the center of the retainer to adjacent its flanged periphery 37. This slot adjacent the center of the retainer is of a size and contour to conformably receive the portion of the plunger rod between the washers 32 and 34, and the enlarged offset portion 38 of the slot 36 being of a size or di-ameter as to conformably receive the washer 34, after which lateral move ment of the retainer 35 and the cup-like packing 29 carried thereby causes the smaller and centrally arranged opening of the slot 36 to be received about the plunger rod 23 and thereby locate the cup-like packing 29 in its proper centered position on the plunger rod 28 with the base or diaphragm 39 of the retainer 35 received and anchored between the spaced washers 32 and 34.

The anged periphery 37 of the retainer is formed or provided with spaced resilient tongues or projections 41 exerting a continuous expanding force `or pressure against the annular flange 31 of the cup-like packing 29 where by to spring-bias and maintain this flange in contact with the internal -cylindrical wall of the pump barrel or container lid. In order to most effectively prolong the life of the cup-like packing, which is generally of leather although it may be of `any exible material or composition suitable for the purpose, the cylinder is expanded at or adjacent its end to provide thereat yand between it and the flared wall of the end cap an annular and outwardly directed space adapted to conformably receive the llange 3i. of the cup-like packing 29 and expand it beyond the normal internal diameter of the cylindrical part of the pump barrel 14. Thus at the end of the compression stroke or when the plunger rod is moved to the position shown in Fig. 3, the cup-like packing is expanded beyond the normal internal diameter of the barrel.

Having thus disclosed the invention, we claim:

l. ln a :compressor having a pump cylinder, a plunger having a pair of spaced washers mounted adjacent an end of the plunger with the lowermost washer of smaller external size than the other, a cup-like packing having an opening therein, and a retainer mounted in the cup of the packing and provided with a key slot having an enlargement -ofset from the center thereof and of a size to receive the lowermost washer, whereby the opening in the packing and the offset enlargement in the slot of the retainer may be slipped over the smaller washer and when the retainer is moved laterally into the space between the washers they are automatically anchored onto the plunger.

2. In a compressor, a pump cylinder having an enlarged wall portion at its discharge end, a plunger and `a cup-like packing in said cylinder having a continuous ange in contact with the internal wall of the cylinder and a central opening through which said plunger projects, and retaining means for mounting the packing upon the end of the plunger, said means including an enlargement on the end of the plunger, a washer on said plunger spaced from said enlargement, and -a retainer provided with resilient means for maintaining the packing ange expanded into contact with the internal wall of the cylinder and with the enlarged wall portion as the plunger approaches the end of the compression stroke, said retainer having a key-hole slot with the enlarged portion of the slot offset from the center of the retainer and of a size to receive the enlargement on the end of the plunger whereby the retainer is slipped over the enlargement on the end of the plunger and moved laterally into detachable connection with the plunger.

3. in a compressor, a cylinder providing an air chamber with the wall of the cylinder flared outwardly at the discharge end, a plunger adapted to be reciprocated in said cylinder and carrying a cup-like packing having -an opening and an annular sealing ange in contact with the internal wall of the cylinder, and -a resilient mounting retaining the packing on the plunger and maintaining the ange of the packing expanded against the internal wall of the cylinder and against the lared end of the cylinder at the end of the compression stroke, said plunger having a washer provided with a depressed central portion adapted to be received in said opening in the cup-like packing and an enlargement on the inner end of the plunger spaced from said first mentioned washer to receive the packing and resilient mounting therebetween. the opening in said packing being adapted to be slipped over the enlargement on the yend of the plunger and located over the depressed portion of said washer, and said mounting having a key slot with the enlarged portion of the slot oliset from the center of the mounting and `of a size to receive the enlargement on the plunger whereby this mounting is slipped over the enlargement on the end of the plunger and moved manually into interlocking engagement with the plunger above said enlargement for detachably retaining the packing in xed position.

4. .Tn a compressor, a pump cylinder having an enlarged wall portion at its discharge end, a plunger and a cup-like packing in `said cylinder having a continuous annular flange in contact with the internal wall of the cylinder and a central opening through which said :plunger projects, a removable retainer for detachably 4mounting the packing on the plunger, said retainer having resilient projections for maintaining the packing iiange expanded into contact with the internal wall of the cylinder and with the enlarged wall portion as the plungerapproaches the end of the compression stroke, and means for detachably mounting the retainer on the end of the plunger including an enlargement on the end of the plunger and a member spaced from said enlarge- `ment for centering the packing on the plunger and a key-hole slot in the retainer with the enlarged portion of the slot offset from the center of the retainer and of a size whereby the retainer is slipped over the enlargement and moved laterally into interlocking engagement.

5. In a compressor, a cylinder providing a pump barrel and having an outwardly iiared wall pontion, a plunger adapted to be reciprocated in the cylinder, a cup-like packing detachably mounted on the end of the plunger having an opening to receive the end. of thc plunger and a flange in contact with the interior of the cylinder as t-he plunger' is operated, a retainer for detachably mounting the packing on the end of the plunger and provided with tension means for expanding the ange of the packing against the outwardly flared wall portion of the cylinder as the plunger approaches the end of its compression stroke and thereby prolonging the life of the packing, and means for detachably mounting the retainer on the end of the plunger including an enlargement on the end of the plunger, a washer on said plunger spaced from said enlargement with the packing mounted between said washer and said enlargement, and a key-hole slot in the retainer, the enlarged end of the key-hole slot being odset from the center of said re tainer and of a size -to receive the enlargement, whereby when the retainer is slipped over the enlargement on the plunger and the retainer moved laterally, the smaller end of the keyhcle slot conformably receives the plunger above said enlargement.

6. In a compressor, a pump cylinder of substantially uniform diameter through the greater portion of its length and adjacent its discharge end having its wall flared outwardly beyond the normal diameter of the cylinder, a plunger adapted to be reciprocated in the cylinder, a cup-like packing having an opening to receive the inner end of the plunger and having its peripheral .rim in contact with the cylinder, a re ainer for detachably mounting the packing on the inner end of the plunger and provided with resilient projections for expanding the peripheral rim of the packing against the flared portion of thewall and beyond the normal diameter of the cylinder as the plunger approaches the end of its compression stroke, and means for detachably mounting said retainer and packing centered on the inner end of said plunger, said means including an enlargement on the inner end of said plunger and an abutment spaced from said enlargement and between which the packing is mounted, and a key slot in said retainer having the enlarged p0rtion of the slot offset from the center of the retainer and of a size to =be slipped over said enlargement `and the retainer moved laterally into interlocking engagement with the plunger.

References Cited in the file of this patent UNITED STATES PATENTS Ingram Aug. 30, 1921 Andrews Oct. 10, 1922 Hallauer Aug. 14, 1923 Marks Aug. 7, 1928 Seyforth Sept. 17, 1935 Smith Feb. 7, 1950 FOREIGN PATENTS Switzerland Nov. 30, 1938 Germany Apr. 9, 1951