US1399151A - Air-compressor - Google Patents

Description

D. M. PUTNAM AND H. M. DUNLAP.

AIR COMPRESSOR.

APPLICATION FILED JUNE 10. 1919.

1,399,151, Patented Dec. 6, 1921.

2 SHEETS-SHEET 1.

7 3mm Definer H. Putnam Harley nbunlap @Vflmaw D. M. PUTNAM AND H M. DUNLAP.

AIR COMPRESSOR.

APPLICATION FILED JUNE 10. 1919.

1 399, 1 5 1 Pat nted Dec- 6, 1921.

- 2 SHEETS-SHEET 2.

3mm Del mer' M, PuTnam ewumm Hurley 1"]. .Dun lgp UNITED, STATES,

PATENT ()FFICE.

DELMER M. PUTNAM Ann HARLEY DUNLAP, or BATTLE CREEK, MICHIGAN.

AIR-GODEIPR-ESSOR.

T 0 all 20 71cm it 172 ag concern Be it known that we, Dnminr. M. PUTNAM and Hana-Er M. DUNLAP, citizens of the United States, residing at Battle Creek, Michigan, have invented certain new and useful Improvements in Air-Compressors, of which the following is a specification.

This invention relates to improvements in air compressors.

The main objects of this invention are:

First, to provide an improveo multi-stage air compressor of the piston type which is of large capacity.

Second, to provide an improved multistage air compressor of the piston type in which rod packings are eliminated.

Third, to provide an improved multi-stage air compressor of the piston type which is simple in its parts and very durable.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

o accomplish the objects of our invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of our invention is clearly illustratec in the accompanying drawing, forming a part of this specification, in which:

Figure I is a side elevation of an air cornpressor embodying features of our invention, a portion of the base being broken away.

Fig. II is a detail view mainly 'in'vertical section, on a line corresponding to line 22 of Fig. III.

Fig. III is a detail view mainly in horizontal section on a line corresponding to line 33 of Figs. I and II.

Fig. IV is a detail view mainly in vertical section corresponding to section of Fig. II showing certain modifications in the compression chamber and discharge connections.

In the drawing, similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawing, 1 represents the base, 2 the crank case and 3 the cylinder of our improved pump. The cylinder 3 is stepped or shouldered at 4 to provide bores of different diameter, the larger bore 5 being at the outer end of the cylinder and the smaller bore 6 at its inner end. The cylin- Specification of Letters Patent. Patented D 6 1921 Application filed. June 10, 1919.

Serial No. 303,227.

der head 7 is in the preferred embodiment a fiat plate. The crank shaft 8 and piston rod 9 are shown conventionally. The piston, designated generally by the numeral 10, has a head portion 11 coacting with the larger bore of the cylinder and a barrel portion 12 coacting with the smaller bore thereof of the cylinder.

The head portion 11 of the piston is provided with piston rings 13 while the barrel portion 12 has piston rings 14 at itsinner end. The outer end of the cylinder constitutes the primary compression chamber, while the portion ofthe larger bore at the rear of the head portion of the piston and surrounding its barrel portion constitutes the secondary compression chamber.

In the embodimentof our improvement shown Fi s. 1, II and III, the primary compression chamber is provided with a dis charge passage opening centrally through the head of the piston to the secondary compression chamber and delivering to the secondary compression chamber at the rear of the head of the piston. See Fig. II.

The piston is provided with a valve chamber 16 for valve 17. This valve is held yield ingly to its seat 18 by the spring 19. These parts are also shown mainly in conventional form, as they form no part of our present in-, vention. The inlet port 20 is provided with a check valve 21. To lessen the noise, the inlet pipe 22 is connected to the crank case 2. The discharge port 23 of the secondary compression chamber is located at the rear of the chamber adjacent the shoulder 4. A check valve 24 is provided for this discharge port, and the pipe 25 leads to the pressure tank or other delivery, as may be desired.

In the modification shown in Fig. IV,

the head 26 is provided with an inlet port 27 provided with the valve 21. The dis-- charge for the primary compression chamber is through port 28 in the cylinder head, pipe 29 and passages 30 and 31, the passage 31 serving both as an inlet and an outlet for the secondary compression chamber. The port 32 connecting the ports 30 and 31 is controlled by check valve 33. The passage 31 connects with the discharge pipe through the check valve 35.

With the parts thus arranged, the air is forced under pressure from the primary compression chamber into the secondary compression chamber as described, which is of much less capacity than the primary compression chamber, owingto the space occu pied by the barrel of the piston.

The packings are of the piston rin type, so the are simple in form and very c urable V and e ective in use, the use of rod packings being entirely avoided by our improvements. The piston rmgslQ are disposed at the rear of the piston pin so that the full stroke of the piston may be utilized.

To providean air tight jointjfor the piston pin and also to effectively support and retain the pin, we provide the piston with opposed.b 0res.36 having inwardly projecting flanges37 about them providing supports for the tubular piston pin 38. Thus the piston pinlisiretained and tight joints provided by means of plug-like retaining o1 adapt same asimaybe desired.

Having thus described our invention, what we claim as new and desire to secure by Lettflrs Patent is V 1. In a multi-sta e air compressor, the combinationof a cyhnder stepped to provide boresof different diameters with the larger bore at thecouter end of the cylinder, a pistonhaving a head portion coacting with said larger boreand a barrel portion-coactingwith the smaller bore, the outer end of the cylinder constituting 'the primary compression chamber and the portion of the larger bore at the rear of the head portion of the piston and surrounding its barrel portion 'constitut'ingthe secondary compression chamber, the head and barrel portions of thejpiston being provided with piston rings, the piston rings of the barrel portion being at its inner end, a discharge passage for'gthe primary compression chamber through the head of the piston opening at the rear thereof, a check valve for said passage, an inlet valve for the primary compression chamber at the outer end of said cylindenand a valved discharge connection for saidsecondary compression chamber at a ber, and the portion of the larger bore at the rear of the head portion of the piston and surrounding its barrel portion constituting a second compression chamber, said chambers being connected for delivery from one to the other, the head and barrel portions of the piston being provided with pis ton rings, the piston rings of the barrel portion being at its inner end, a piston rod, a piston pin therefor disposed between the piston ringsoi' said piston and so that it passes from the reduced portion of the cylinder 'on I the outstroke of the piston, and means .for sealing the ends of the piston pin whereby leakage from the said.secondmoinpression chamber through the-piston is prevented,

In witness whereof we vhave hereunto set our hands and seals."

DELMER ML PUTNAM 'L. s] HARLEY MFDUNLAP 1a. 3.

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