Check valve assembly for glass forming machinery

Abstract: A check valve assembly which is to permit flow into a pneumatic cylinder is accessible without taking the cylinder apart. The check valve (44) is located within an insert (30) which is secured to the cylinder head at an exterior surface. Removal of the insert makes the check valve accessible.

Description: The present invention relates to individual section glassware forming machines which are utilized to make containers such as bottles and the like. In this machinery, system elements are pneumatically displaced and provision has to be made to locate check valves in some of the air lines to restrict air flow to a single direction. When this air flow direction is into the mechanism, the check valve is conventionally located in a bore defined in an interior surface of the mechanism. This makes replacement extremely difficult since the mechanism must be taken apart in a very hot and unpleasant environment to gain access to the check valve. It is accordingly an object of the present invention to provide a check valve assembly for glass forming machinery which will make check valve replacement quick and easy. The present invention provides a glass container manufacturing machine which comprises a pneumatic cylinder having a cylindrical housing and a head closing one end of the housing an operating air line for directing air through the head and including an inlet conduit leading from an exterior surface of the head and an inlet port communicating with the interior of the housing a check valve connecting the inlet conduit to the inlet port characterized in that the check valve is comprised in a check valve assembly further comprising an insert which secures the check valve in the head and comprises a head portion at one end, a threaded section adjacent the head portion and a reduced diameter cylindrical portion at the other end in which a bore extends axially, the check valve being accommodated in the bore securing means for securing the check valve in the bore and having a bore extending axially there through a passageway in the insert extending from the bore to the exterior surface of the reduced portion and in that the head comprises an insert receiving bore having a threaded portion adapted to engage the threaded portion and a portion in which the portion of the insert slidingly fits, a manifold defined by the bore and the reduced portion of the insert and connecting the passageway to the inlet conduit whereby the check valve and the insert can be removed as a unit from the head. There now follows a description with reference to the accompanying drawing of an embodiment of the invention chosen to illustrate the invention by way of example. The drawing shows a cross sectional elevational view of a portion including a check valve assembly of an individual section of an individual section glass container forming machine. An individual section receives a gob of molten glass, forms the gob into a parison in a blank mold, transfers the parison to a finish mold and then blows the parison into a container. Each mold has a plurality of parts which are displaced to and from a mold forming location by a pneumatic cylinder 10 having a cylindrical housing 12 and a head 14. A piston 16 is slidably displaceable axially along the cylindrical housing 12 and the integral rod 18 is connected to the movable mold parts (not shown) to effect the desired displacement of the molds. To displace the piston to the left, operating air is directed through an inlet air conduit 20 through a check valve assembly 22 and into an inlet port 24 communicating with the volume 26 defined between the piston 16 and the cylinder housing 12 and head 14. The check valve assembly 22 includes an insert 30 which has a large hex head 32, a threaded section 34 axially separated from the head by an annular groove 36 which receives an O-ring 38 and a reduced diameter cylindrical portion 40 which extends from the threaded section 34 to the end of the insert. Extending axially from the end 41 of the insert is a bore 42 which receives a check valve 44. The outer end of the bore is threaded 46 to receive a retaining screw 48 which has an axial thru hole 50. The inner end of the check valve bore communicates with a pair of diametral thru-bores 52 and an annular groove 54 in the cylindrical wall receives an O-ring 56. An insert receiving bore 58 in the head 14 has a threaded opening portion 60 to threadedly receive the threaded insert section 34 and has a reduced diameter bottom cylindrical portion 62 which slidingly receives the bottom of the cylindrical insert portion 40 (the O-ring 56 seals these surfaces). The portion of the insert receiving bore 58 between the threaded bore portion 60 and the reduced diameter portion 62 is spaced from the insert and thereby defines a manifold 64 connecting the operating air inlet 20 with the insert thru diametral bores 52 so that air can pass through the check valve and into the cylinder and not vice versa. To remove and replace a faulty check valve the insert is screwed out of the insert receiving bore and replaced with a new check valve assembly. The faulty check valve assembly can then be repaired remote from the I.S. machine by unscrewing the retaining screw 48 exposing the faulty check valve.

Claims: A glass container manufacturing machine which comprises a pneumatic cylinder (10) having a cylindrical housing (12) and a head (14) closing one end of the housing (12) an operating air line for directing air through the head (14) and including an inlet conduit (20) leading from an exterior surface of the head and an inlet port (24) communicating with the interior of the housing (12) a check valve (44) connecting the inlet conduit (20) to the inlet port (24) characterized in that the check valve (44) is comprised in a check valve assembly further comprising an insert (30) which secures the check valve in the head (14) and comprises a head portion (32) at one end, a threaded section (34) adjacent the head portion and a reduced diameter cylindrical portion (40) at the other end in which a bore (42) extends axially, the check valve being accommodated in the bore (42) securing means (48) for securing the check valve in the bore (42) and having a bore (50) extending axially there through a passageway (52) in the insert extending from the bore (42) to the exterior surface of the reduced portion (40) and in that the head (14) comprises an insert receiving bore (58,62) having a threaded portion (60) adapted to engage the threaded portion (34) and a portion (62) in which the portion (40) of the insert slidingly fits, a manifold (64) defined by the bore (58) and the reduced portion (40) of the insert (30) and connecting the passageway (52) to the inlet conduit (20) whereby the check valve and the insert (30) can be removed as a unit from the head (14) A machine according to claim 1 further characterized in that means (54,56) are provided for establishing a fluid seal between the internal surface of the bore (62) and the external surface of the cylindrical portion (42) of the insert

Inventors: GORSKI RICHARD ALAN, GORSKI, RICHARD ALAN
Applicants: EMHART GLASS MACH INVEST, EMHART GLASS MACHINERY INVESTMENTS INC.
Application year: 1990
Main classification: C03B9
IPC codes: C03B9