Compressor having easily installed check valves

Details Compressor having easily installed check valves Compressor having easily installed check valves

1999-06-14

2001-02-20

Freay, Charles G. (Department: 3746)

Pumps

Expansible chamber type

Having pumping chamber pressure responsive distributor

C137S512000, C137S454400

Reexamination Certificate

active

06190144

ABSTRACT:

The present invention relates to a compressor, preferably, but not exclusively, a low-power compressor normally suitable for domestic, as opposed to professional, use.
BACKGROUND OF THE INVENTION
Known compressors normally comprise at least one cylinder, in which is defined a compression chamber in turn defined, at the bottom, by a piston movable along the cylinder, and, at the top, by a wall having a suction opening and an exhaust opening, each of which is connected to a respective conduit by a respective valve.
The valves of known low-power compressors are normally blade types, i.e. each defined by a respective elastic metal blade contacting a flat seat formed in a metal valve-holder plate about a respective conduit to normally close the conduit, and which is deformed elastically by the suction or compression pressure to open the conduit.
Blade valves have several drawbacks, and in particular generate a high noise level on account of the blade metal continually striking the metal of the valve-holder plate.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a compressor designed to eliminate the aforementioned drawback, and which is also straightforward and cheap to produce.
According to the present invention, there is provided a compressor comprising at least one cylinder having an end wall in turn having a suction opening and an exhaust opening; a piston movable along said cylinder; a suction conduit and an exhaust conduit connected respectively to said suction opening and said exhaust opening; a compression chamber defined in said cylinder, and which is defined at the bottom by said piston and at the top by said end wall; and a suction valve and an exhaust valve for respectively controlling said suction conduit and said exhaust conduit; characterized in that each said valve comprises a tubular body housed in sealed manner inside the respective said conduit; a valve seat formed in said tubular body; a sealing member sliding along said tubular body to and from a contact and closed position contacting in sealed manner said valve seat and closing said tubular body; and elastic means for normally maintaining said sealing member in said contact and closed position with a force of a predetermined value.


REFERENCES:
patent: 2800142 (1957-07-01), Champion
patent: 3250225 (1966-05-01), Taplin
patent: 3354830 (1967-11-01), Mortara
patent: 3679333 (1972-07-01), Zoppi
patent: 5520522 (1996-05-01), Rathore et al.
patent: 5839468 (1998-11-01), Allred
patent: 2107830 (1983-05-01), None

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