Thermoplastic applicator including a removable filter

Claim 1

A system for dispensing molten thermoplastic material comprising a source of molten material, a pump having an inlet port and an outlet port, said inlet port being in fluid communication with said source of molten material, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, means defining a flow path connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said flow path, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means, said cartridge comprising a generally tubular body having a combination check valve-relief valve mounted in one end and a removable plug mounted in the opposite end, said cartridge further including a filter removably attached to said plug and removable from said cartridge only by removal of said plug, and means supporting said plug and filter in said body so that said plug and filter are removable from said cartridge body while said combination check valve-relief valve is retained in said tubular body.

Claim 2

A system for dispensing molten thermoplastic material comprising a source of molten material, a pump having an inlet port and an outlet port, said inlet port being in fluid communication with said source of molten material, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, means defining a flow path connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said flow path, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means, said cartridge comprising a generally tubular body having a combination check valve-relief valve mounted in one end and a removable plug mounted in the opposite end, said cartridge further including a filter removably attached to said plug and removable from said cartridge only by removal of said plug, and means supporting said plug and filter in said body so that said plug and filter are removable from said cartridge body while said combination check valve-relief valve is retained in said tubular body.

Claim 5

A system for dispensing molten thermoplastic material comprising a heated reservoir for holding and maintaining said material in a molten state, said reservoir having bottom, side and top walls, a cylinder secured to one of said walls of said reservoir and having an axial bore therein, a motor piston movable within said cylinder bore and having a piston rod projecting into said reservoir, a pump secured to said motor piston rod, said pump having an outlet port, said pump being operable upon reciprocation of said motor piston to eject molten material from said reservoir through said pump outlet port, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, conduit means connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said conduit means, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means in the flow path of said conduit means, said cartridge comprising a generally tubular body having a combination check valve-pressure relief valve mounted in one end and a removable plug mounted in the opposite end, said cartridge further including a filter removably attached to said plug and removable from said cartridge only by removal of said plug, and means supporting said plug and filter in said body so that said plug and filter are removable together as a unit from said cartridge body while said combination check valve-relief valve is retained in said tubular body.

Claim 6

A system for dispensing molten thermoplastic material comprising a heated reservoir for holding and maintaining said material in a molten state, said reservoir having bottom, side and top walls, a cylinder secured to one of said walls of said reservoir and having an axial bore therein, a motor piston movable within said cylinder bore and having a piston rod projecting into said reservoir, a pump secured to said motor piston rod, said pump having an outlet port, said pump being operable upon reciprocation of said motor piston to eject molten material from said reservoir through said pump outlet port, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, conduit means connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said conduit means, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means in the flow path of said conduit means, said cartridge comprising a generally tubular body having a combination check valve-pressure relief valve mounted in one end and a removable plug mounted in the opposite end, said cartridge further including a filter removably attached to said plug and removable from said cartridge only by removal of said plug, and means supporting said plug and filter in said body so that said plug and filter are removable together as a unit from said cartridge body while said combination check valve-relief valve is retained in said tubular body.

Claim 10

A system for dispensing molten thermoplastic material comprising a source of molten material, a pump having an inlet port and an outlet port, said inlet port being in fluid communication with said source of molten material, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, means defining a flow path connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said flow path, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means, said cartridge comprising a body having a combination check valve-pressure relief valve mounted in said body, a plug mounted in said body, said cartridge further including a filter attached to said plug, and said plug and filter being separately removable from said cartridge body while said combination check valve-relief valve is retained in said body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 11

A system for dispensing molten thermoplastic material comprising a source of molten material, a pump having an inlet port and an outlet port, said inlet port being in fluid communication with said source of molten material, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, means defining a flow path connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said flow path, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means, said cartridge comprising a body having a combination check valve-pressure relief valve mounted in said body, a plug mounted in said body, said cartridge further including a filter attached to said plug, and said plug and filter being separately removable from said cartridge body while said combination check valve-relief valve is retained in said body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 12

A system for dispensing molten thermoplastic material comprising a source of molten material, a pump having an inlet port and an outlet port, said inlet port being in fluid communication with said source of molten material, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, means defining a flow path connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said flow path, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means, said cartridge comprising a generally tubular body having a combination check valve-relief valve mounted in one end and a plug mounted in the opposite end, said cartridge further including a filter attached to said plug, means supporting said plug and filter in said body so that said plug and filter are separately removable from said cartridge body while said combination check valve-relief valve is retained in said tubular body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 13

A system for dispensing molten thermoplastic material comprising a source of molten material, a pump having an inlet port and an outlet port, said inlet port being in fluid communication with said source of molten material, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, means defining a flow path connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said flow path, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means, said cartridge comprising a generally tubular body having a combination check valve-relief valve mounted in one end and a plug mounted in the opposite end, said cartridge further including a filter attached to said plug, means supporting said plug and filter in said body so that said plug and filter are separately removable from said cartridge body while said combination check valve-relief valve is retained in said tubular body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 14

A system for dispensing molten thermoplastic material comprising a heated reservoir for holding and maintaining said material in a molten state, said reservoir having bottom, side and top walls, a cylinder secured to one of said walls of said reservoir and having an axial bore therein, a motor piston movable within said cylinder bore and having a piston rod projecting into said reservoir, a pump secured to said motor piston rod, said pump having an outlet port, said pump being operable upon reciprocation of said motor piston to eject molten material from said reservoir through said pump outlet port, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, conduit means connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said conduit means, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means in the flow path of said conduit means, said cartridge comprising a body having a combination check valve-pressure relief valve mounted in said body, a plug mounted in said body, said cartridge further including a filter attached to said plug, said plug and filter being separately removable from said cartridge body while said combination check valve-relief valve is retained in said body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 15

A system for dispensing molten thermoplastic material comprising a heated reservoir for holding and maintaining said material in a molten state, said reservoir having bottom, side and top walls, a cylinder secured to one of said walls of said reservoir and having an axial bore therein, a motor piston movable within said cylinder bore and having a piston rod projecting into said reservoir, a pump secured to said motor piston rod, said pump having an outlet port, said pump being operable upon reciprocation of said motor piston to eject molten material from said reservoir through said pump outlet port, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, conduit means connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said conduit means, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means in the flow path of said conduit means, said cartridge comprising a body having a combination check valve-pressure relief valve mounted in said body, a plug mounted in said body, said cartridge further including a filter attached to said plug, said plug and filter being separately removable from said cartridge body while said combination check valve-relief valve is retained in said body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 16

A system for dispensing molten thermoplastic material comprising a heated reservoir for holding and maintaining said material in a molten state, said reservoir having bottom, side and top walls, a cylinder secured to one of said walls of said reservoir and having an axial bore therein, a motor piston movable within said cylinder bore and having a piston rod projecting into said reservoir, a pump secured to said motor piston rod, said pump having an outlet port, said pump being operable upon reciprocation of said motor piston to eject molten material from said reservoir through said pump outlet port, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, conduit means connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said conduit means, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means in the flow path of said conduit means, said cartridge comprising a generally tubular body having a combination check valve-relief valve mounted in one end and a plug mounted in the opposite end, said cartridge further including a filter attached to said plug, and means supporting said plug and filter in said body so that said plug and filter are separately removable from said cartridge body while said combination check valve-relief valve is retained in said tubular body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.

Claim 17

A system for dispensing molten thermoplastic material comprising a heated reservoir for holding and maintaining said material in a molten state, said reservoir having bottom, side and top walls, a cylinder secured to one of said walls of said reservoir and having an axial bore therein, a motor piston movable within said cylinder bore and having a piston rod projecting into said reservoir, a pump secured to said motor piston rod, said pump having an outlet port, said pump being operable upon reciprocation of said motor piston to eject molten material from said reservoir through said pump outlet port, a dispenser gun including a gun inlet port, a flow control valve, and a gun outlet orifice, conduit means connecting the inlet port of said gun to the outlet port of said pump, cartridge mounting means located in said conduit means, a combination filter, check valve, relief valve cartridge mounted in said cartridge mounting means in the flow path of said conduit means, said cartridge comprising a generally tubular body having a combination check valve-relief valve mounted in one end and a plug mounted in the opposite end, said cartridge further including a filter attached to said plug, and means supporting said plug and filter in said body so that said plug and filter are separately removable from said cartridge body while said combination check valve-relief valve is retained in said tubular body, and said combination check valve-pressure relief valve comprising a pressure relief valve plunger slideably mounted in the end of said body, a check valve plate slideably mounted over said plunger, said plate having a first valve seat engageable with said cartridge supporting means and a second valve seat engageable with said plunger, first spring means for urging said plate into engagement with said first seat such that said plate, first spring means and first seat together form a one-way flow check valve, and second spring means for urging said plunger into engagement with said second seat such that said plunger, second spring means, and plate together form a pressure relief valve for relieving excessive pressure internally of said tubular body.