No drip suck back units for glue or other liquids either separately installed with or incorporated into no drip suck back liquid applying and control apparatus

Claim 2

A no drip suck back unit for glue and other liquids to completely avoid any dripping after the stopping of the glue or other liquid being supplied through a discharge opening, comprising: a. a body; b. an interior chamber in the body; c. a liquid passageway continuing through the body entering and leaving the interior chamber; d. an air passageway entering the body and terminating in the interior chamber; and e. a diaphragm flexible from its mid position in the interior chamber to move one way to decrease the liquid volume of the chamber and to move the opposite way to decrease the air volume of the chamber, the latter movement creating a vacuum volume to suck back liquid increasing the overall liquid volume of the interior chamber.

Claim 3

A no drip suck back unit for glue and other liquids, as claimed in claim 1, wherein a compression spring is inserted in the interior chamber in the liquid volume to urge the diaphragm to its mid position and beyond.

Claim 4

an interior chamber in the body;

Claim 5

an interior chamber in the body;

Claim 6

an interior chamber in the body;

Claim 7

an interior chamber in the body;

Claim 8

an air passageway entering the body and terminating in the interior chamber;

Claim 9

an air passageway entering the body and terminating in the interior chamber;

Claim 10

a liquid passageway continuing through the body entering and leaving the interior chamber;

Claim 11

a liquid passageway continuing through the body entering and leaving the interior chamber;

Claim 12

A no drip suck back unit for glue and other liquids, as claimed in claim 1, wherein compressed air is introduced in the interior chamber in the air volume to urge the diaphragm beyond its mid position decreasing the liquid volume.

Claim 13

A no drip suck back unit for glue and other liquids, as claimed in claim 3, wherein a compression spring is inserted into the interior chamber in the liquid volume to return the diaphragm beyond its mid position, upon the exhausting of the compressed air to atmosphere, thereby creating a vacuum volume into which liquid is sucked back.

Claim 14

an air passageway entering the body and terminating in the interior chamber; and

Claim 15

an air passageway entering the body and terminating in the interior chamber; and

Claim 16

a liquid passageway in the body entering the body and leaving the interior chamber;

Claim 17

a liquid passageway in the body entering the body and leaving the interior chamber;

Claim 18

a diaphragm flexible from its mid position in the interior chamber to move one way to decrease the liquid volume of the chamber; and

Claim 19

a diaphragm flexible from its mid position in the interior chamber to move one way to decrease the liquid volume of the chamber; and

Claim 20

a diaphragm flexible from its mid position in the interior chamber to move one way to decrease the liquid volume of the chamber and to move the opposite way to decrease the air volume of the chamber, the latter movement creating a vacuum volume to suck back liquid increasing the overall liquid volume of the interior chamber; and b. a liquid control unit having

Claim 21

a diaphragm flexible from its mid position in the interior chamber to move one way to decrease the liquid volume of the chamber and to move the opposite way to decrease the air volume of the chamber, the latter movement creating a vacuum volume to suck back liquid increasing the overall liquid volume of the interior chamber; and b. a liquid control unit having

Claim 22

A no drip suck back unit for glue and other liquids, as claimed in claim 1, wherein the body is formed of two portions extending in opposite directions from the diaphragm which also serves as a seal between them and defines the air and liquid volumes of the interior chamber.

Claim 23

A no drip suck back unit for glue and other liquids, as claimed in claim 1, having a liquid discharge nozzle means connected to the exit of the liquid passageway.

Claim 24

a valve and orifice subassembly positioned in the body and having a stem of the valve connected to the flexible diaphragm so the valve is moved upon flexing of the diaphragm to open the orifice allowing the flow of liquid on to the no drip suck back unit.

Claim 25

a valve and orifice subassembly positioned in the body and having a stem of the valve connected to the flexible diaphragm so the valve is moved upon flexing of the diaphragm to open the orifice allowing the flow of liquid on to the no drip suck back unit.

Claim 26

A no drip suck back unit for glue and other liquids, as claimed in claim 1, having a controllable compressed air supply means connected to the entrance of the air passageway.

Claim 27

A no drip suck back unit for glue and other liquids, as claimed in claim 1, having a controllable liquid supply means, under pressure, connected to the entrance of the liquid passageway.

Claim 28

A no drip suck back unit for glue and other liquids, as claimed in claim 1, having a controllable compressed air supply means connected to the entrance of the air passageway, and a controllable liquid supply means, under pressure, connected to the entrance of the liquid passageway.

Claim 29

A no drip suck back unit for glue and other liquids, as claimed in claim 2, having a controllable compressed air supply means connected to the entrance of the air passageway, and a controllable liquid supply means, under pressure, connected to the entrance of the liquid passageway.

Claim 30

A no drip suck back unit for glue and other liquids, as claimed in claim 10, having a liquid discharge nozzle means connected to the exit of the liquid passageway.

Claim 31

A no drip suck back unit for glue and other liquids, as claimed in claim 9, having a common control means for both the controllable compressed air supply and controllable liquid supply means.

Claim 32

A no drip suck back unit for glue and other liquids, as claimed in claim 10, having a common control meaNs for both the controllable compressed air supply and controllable liquid supply means.

Claim 33

A combination of a separate no drip suck back unit and a liquid control unit installable in liquid supply equipment to completely avoid any dripping after the stopping of glue or other liquid being supplied through a discharge opening, comprising: a. a no drip suck back unit having

Claim 34

A combination of a separate no drip suck back unit and a liquid control unit installable in liquid supply equipment to completely avoid any dripping after the stopping of glue or other liquid being supplied through a discharge opening, comprising: a. a no drip suck back unit having

Claim 35

The combination of the separate no drip suck back unit and a liquid control unit, as claimed in claim 14, having a controllable source of compressed air directed simultaneously to the air passageways of both units and simultaneously exhausted from these air passageways thereby controlling the flexures of the respective flexible diaphragms and thereby stopping the liquid flow without any drip occurring.

Claim 36

The combination of the separate no drip suck back unit and a liquid control unit, as claimed in claim 15, having respective return compression springs moving each diaphragm toward the respective air volumes of the respective chambers.

Claim 37

An incorporated no drip suck back unit and liquid control unit installable in liquid supply equipment to completely avoid any dripping after the stopping of glue or other liquid being supplied through a discharge opening, comprising: a. a body; b. a first interior chamber in the body; c. a first air passageway entering the body and terminating in the first interior chamber; d. a first liquid passageway in the body entering the body and leaving the first interior chamber; e. a first diaphragm flexible from its mid position in the first interior chamber to move one way to decrease the liquid volume of the chamber; f. a valve and orifice subassembly positioned in the body and having a stem of the valve connected to the first flexible diaphragm so the valve is moved upon flexing of the first diaphragm to open the orifice allowing the flow of liquid on to the no drip suck back unit; g. a second interior chamber in the body; h. a second liquid passageway in the body continuing on from the first interior chamber to the second interior chamber and beyond continuing on through the body; i. a second air passageway in the body commencing in the first interior chamber and terminating in the second interior chamber; j. a second diaphragm flexible from its mid position in the second interior chamber to move one way to decrease the liquid volume of the second chamber and to move the opposite way to decrease the air volume of the second chamber, the latter movement creating a vacuum volume to suck back liquid increasing the overall liquid volume of the interior chamber.

Claim 38

An incorporated no drip suck back unit and liquid control unit installable in liquid supply equipment to completely avoid any dripping after the stopping of glue or other liquid being supplied through a discharge opening, comprising: a. a body; b. a first interior chamber in the body; c. a first air passageway entering the body and terminating in the first interior chamber; d. a first liquid passageway in the body entering the body and leaving the first interior chamber; e. a first diaphragm flexible from its mid position in the first interior chamber to move one way to decrease the liquid volume of the chamber; f. a valve and orifice subassembly positioned in the body and having a stem of the valve connected to the first flexible diaphragm so the valve is moved upon flexing of the first diaphragm to open the orifice allowing the flow of liquid on to the no drip suck back unit; g. a second interior chamber in the body; h. a second liquid passageway in the body continuing on from the first interior chamber to the second interior chamber and beyond continuing on through the body; i. a second air passageway in the body commencing in the first interior chamber and terminating in the second interior chamber; j. a second diaphragm flexible from its mid position in the second interior chamber to move one way to decrease the liquid volume of the second chamber and to move the opposite way to decrease the air volume of the second chamber, the latter movement creating a vacuum volume to suck back liquid increasing the overall liquid volume of the interior chamber.

Claim 39

The incorporated no drip suck baCk unit and liquid control unit installable in liquid supply equipment, as claimed in claim 17, having a controllable source of compressed air, exhaustable to atmosphere, connected to the first air passageway and utilized to control the flexures of the respective first and second diaphragms and thereby stopping the liquid flow without any drip occurring.

Claim 40

The incorporated no drip suck back unit and liquid control unit installable in liquid supply equipment, as claimed in claim 18, having respective return compression springs moving each diaphragm toward the respective air volumes of the respective chambers.

Claim 41

The incorporated no drip suck back unit and liquid control unit installable in liquid supply equipment, as claimed in claim 19, having an electrical operated solenoid air valve to control the source of compressed air.