Dosage control for adhesive dispenser

Claim 2

A pneumatically actuatable dispenser for an adhesive, as provided within a cartridge having a chamber containing said adhesive, said cartridge having a first end and a second end and having a nozzle mounted upon said first end, said chamber having a plunger accessible from said second end and displaceable through said chamber, toward said nozzle, so as to force said adhesive into said nozzle, through which said adhesive is ejected, said dispenser comprising: (a) a frame adapted to hold said cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to said frame so as to support said frame with said cartridge held by said frame, said pneumatic mechanism including (i) a pneumatic cylinder fixed to said frame; (ii) pneumatic piston means arranged to be pneumatically driven within said pneumatic cylinder by said pressurized air; (iii) control means for selectively driving said pneumatic piston means within said pneumatic cylinder in either a forward direction or in a reverse direction by said pressurized air; (iv) a piston rod extended from said pneumatic piston means, through one end of said pneumatic cylinder, and arranged to move conjointly with said pneumatic piston means, to drive said plunger of said cartridge held by said frame toward said nozzle when said pneumatic piston means is driven in said forward direction, and to withdraw from said plunger of said cartridge when said pneumatic piston means is driven in said reverse direction; and (c) means predeterminedly adjustable by means of a user and operatively connected to said piston means for actuating said pneumatic control means so as to predeterminedly limit said conjoint movement of said pneumatic piston means and said piston rod in said forward direction beyond a predetermined amount of travel of said pneumatic piston means and said piston rod so as to enable said dispenser to eject an adjustably controlled dose of said adhesive from said cartridge held by said frame.

Claim 3

A pneumatically actuatable dispenser as set forth in claim 1, wherein the pneumatic mechanism comprises: (i) a manually actuatable valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to divert pressurized air entering the pneumatic mechanism; and (ii) a hose connected to and arranged to receive pressurized air from the valve.

Claim 4

The dispenser of claim 2 wherein the pneumatic mechanism comprises a nozzle connected to the hose.

Claim 5

A dispenser as set forth in claim 1, wherein: said pneumatic control means comprises a first fluid circuit for fluidically connecting said source of pressurized air to said pneumatic piston means so as to drive said pneumatic piston means in said forward direction, a first manually actuatable valve means for closing said first fluid circuit so as to permit said pressurized air to drive said pneumatic piston means in said forward direction, and a second valve means for opening said first fluid circuit so as to vent said pressurized air from said first fluid circuit and thereby prevent said pressurized air from driving said pneumatic piston means; and said actuating means comprises an actuator block adjustably mounted upon said piston means for engaging said second valve means of said pneumatic control means at a predetermined location of said travel of said pneumatic piston means so as to open said first fluid circuit and vent said pressurized air from said first fluid circuit.

Claim 6

A pneumatically actuatable dispenser for an adhesive, as provided in a cartridge having a chamber containing the adhesive, the cartridge having a first end and a second end and having a nozzle mounted to the first end, the chamber having a plunger accessible from the second end and displaceable through the chamber, toward the nozzle, so as to force the adhesive into the nozzle, through which the adhesive is ejected, the dispenser comprising: (a) a frame adapted to hold such a cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to the frame so as to support the frame with such a cartridge held by the frame, the pneumatic mechanism comprising: (i) a pneumatic cylinder affixed to the frame; (ii) a pneumatic piston arranged to be pneumatically driven within the cylinder, selectively in a forward direction or in a reverse direction; (iii) a piston rod extended from the pneumatic cylinder, through one end of the pneumatic cylinder, and arranged to move conjointly with the pneumatic piston, to drive the plunger of such a cartridge held by the frame toward the nozzle when the pneumatic piston is driven in a forward direction, and to withdraw from the plunger of the last-mentioned cartridge when the pneumatic piston is driven in the reverse direction; and (iv) pneumatic valves comprising (1) a manually actuatable first valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the forward direction; (2) a manually actuatable second valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the reverse direction; and (3) a mechanically actuatable third valve arranged, when actuated mechanically while the first valve is actuated, to block pressurized air from flowing from the first valve into the pneumatic cylinder and simultaneously to vent pressurized air, as delivered previously by the first valve, from the pneumatic cylinder to ambient atmosphere; and (c) means adjustable by a user for limiting conjoint movement of the pneumatic piston and the piston rod in the forward direction so as to enable the dispenser to eject an adjustably controlled dose of an adhesive from such a cartridge held by the frame, the means comprising: (i) a first control rod arranged to be conjointly driven with the pneumatic piston, along an exterior surface of such a cartridge held by the front frame, without interfering with the last-mentioned cartridge; (ii) a second control rod arranged to be selectively linked to or unlinked from the first control rod so as to move conjointly with the first control rod, in parallel relation to the first control rod, when linked to the first control rod, and so as to be independently movable when unlinked from the first control rod; (iii) means operable manually and selectively by a user to link the second control rod to the first control rod, at any position within a range of possible positions along the first control rod, or to unlink the second control rod from the first control rod; (iv) an actuator positionable adjustably along the second control rod, at any position within a range of possible positions along the second control rod, for conjoint movement with the second control rod, the actuator being arranged to actuate the third valve upon conjoint movement of the first control rod, the second control rod, and the actuator from respective dose-initiating positions relative to the pneumatic cylinder, where the piston rod can begin to drive the plunger of such a cartridge held by the frame toward the nozzle of the last-mentioned cartridge, to respective dose-concluding positions relative to the pneumatic cylinder, where the plunger of the last-mentioned cartridge has been displaced by a distance correlating to a controlled dose of the adhesive from the last-mentioned cartridge; whereby the actuator can be adjustably positioned along the second control rod so as to enable the dispenser, when the second control rod is linked to the first control rod, to eject a controlled dose of an adhesive from such a cartridge held by the frame with the last-mentioned dose being less than full contents of the last-mentioned cartridge.

Claim 7

A pneumatically actuatable dispenser for an adhesive, as provided in a cartridge having a chamber containing the adhesive, the cartridge having a first end and a second end and having a nozzle mounted to the first end, the chamber having a plunger accessible from the second end and displaceable through the chamber, toward the nozzle, so as to force the adhesive into the nozzle, through which the adhesive is ejected, the dispenser comprising: (a) a frame adapted to hold such a cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to the frame so as to support the frame with such a cartridge held by the frame, the pneumatic mechanism comprising: (i) a pneumatic cylinder affixed to the frame; (ii) a pneumatic piston arranged to be pneumatically driven within the cylinder, selectively in a forward direction or in a reverse direction; (iii) a piston rod extended from the pneumatic cylinder, through one end of the pneumatic cylinder, and arranged to move conjointly with the pneumatic piston, to drive the plunger of such a cartridge held by the frame toward the nozzle when the pneumatic piston is driven in a forward direction, and to withdraw from the plunger of the last-mentioned cartridge when the pneumatic piston is driven in the reverse direction; and (iv) pneumatic valves comprising (1) a manually actuatable first valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the forward direction; (2) a manually actuatable second valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the reverse direction; and (3) a mechanically actuatable third valve arranged, when actuated mechanically while the first valve is actuated, to block pressurized air from flowing from the first valve into the pneumatic cylinder and simultaneously to vent pressurized air, as delivered previously by the first valve, from the pneumatic cylinder to ambient atmosphere; and (c) means adjustable by a user for limiting conjoint movement of the pneumatic piston and the piston rod in the forward direction so as to enable the dispenser to eject an adjustably controlled dose of an adhesive from such a cartridge held by the frame, the means comprising: (i) a first control rod arranged to be conjointly driven with the pneumatic piston, along an exterior surface of such a cartridge held by the front frame, without interfering with the last-mentioned cartridge; (ii) a second control rod arranged to be selectively linked to or unlinked from the first control rod so as to move conjointly with the first control rod, in parallel relation to the first control rod, when linked to the first control rod, and so as to be independently movable when unlinked from the first control rod; (iii) means operable manually and selectively by a user to link the second control rod to the first control rod, at any position within a range of possible positions along the first control rod, or to unlink the second control rod from the first control rod; (iv) an actuator positionable adjustably along the second control rod, at any position within a range of possible positions along the second control rod, for conjoint movement with the second control rod, the actuator being arranged to actuate the third valve upon conjoint movement of the first control rod, the second control rod, and the actuator from respective dose-initiating positions relative to the pneumatic cylinder, where the piston rod can begin to drive the plunger of such a cartridge held by the frame toward the nozzle of the last-mentioned cartridge, to respective dose-concluding positions relative to the pneumatic cylinder, where the plunger of the last-mentioned cartridge has been displaced by a distance correlating to a controlled dose of the adhesive from the last-mentioned cartridge; whereby the actuator can be adjustably positioned along the second control rod so as to enable the dispenser, when the second control rod is linked to the first control rod, to eject a controlled dose of an adhesive from such a cartridge held by the frame with the last-mentioned dose being less than full contents of the last-mentioned cartridge.

Claim 8

The dispenser of claim 5 wherein the means operable manually and a user comprise a linking lever attached to one end of the second control rod so as to retain the linking lever on the end of the second control rod but to permit a limited range of pivotal movement of the linking lever on the end of the second control rod, the linking lever having an aperture, through which the first control rod extends with a loose fit allowing the first control rod to pass freely through aperture except when pivotal movement of the linking lever causes the linking lever frictionally to engage the first control, means for biasing the second control rod in the reverse direction, and means operable manually by a user to position the linking lever selectively in a pivotal position permitting the first control rod to pass freely through the aperture or in a pivotal position causing the linking lever frictionally to engage the first control rod as mentioned.

Claim 9

The dispenser of claim 6 wherein the means operable manually by a user to position the linking lever comprises a cam mounted operatively in fixed relation to the pneumatic cylinder and arranged to be manually adjusted between a condition wherein the cam engages and is interposed between the linking lever and adjacent structure so as to position the linking means in the pivotal position permitting the first control rod to pass freely through the aperture and a condition wherein the cam permits the means for biasing the second control rod in the rearward direction to pivot the linking lever, by means of the second control rod, to the pivotal position causing the linking lever frictionally to engage the first control rod as mentioned.

Claim 10

The dispenser of claim 6 wherein the means operable manually by a user to position the linking lever comprises a cam mounted operatively to the linking lever and arranged to be manually adjusted between a condition wherein the cam engages and is interposed between the linking lever and adjacent structure so as to position the linking means in the pivotal position permitting the first control rod to pass freely through the aperture and a condition wherein the cam permits the means for biasing the second control rod in the rearward direction to pivot the linking lever, by means of the second control rod, to the pivotal position causing the linking lever frictionally to engage the first control rod as mentioned.

Claim 11

The dispenser of claim 5 wherein the pneumatic mechanism comprises a manually actuated fourth valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to divert pressurized air entering the pneumatic mechanism, along with a hose connected to and arranged to receive pressurized air from the fourth valve.

Claim 12

The dispenser of claim 9 wherein the pneumatic mechanism comprises a nozzle connected to the hose.

Claim 13

A pneumatically actuatable dispenser for a two-part adhesive, as provided within a cartridge having two chambers, each containing one of two parts of said adhesive, said cartridge having a first end and a second end, and a mixing nozzle mounted upon said first end and arranged to receive one of said parts of said adhesive from each chamber and to mix said parts together, each chamber having a plunger accessible from said second end and displaceable through said chamber, toward said nozzle, in which said parts of said adhesive are mixed, and through which said mixed parts of said adhesive are ejected, said dispenser comprising: (a) a frame adapted to hold said cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to said frame so as to support said frame with said cartridge held by said frame, said pneumatic mechanism including (i) a pneumatic cylinder fixed to said frame; (ii) pneumatic piston means arranged to be pneumatically driven within said pneumatic cylinder by said pressurized air; (iii) control means for selectively driving said pneumatic piston means within said pneumatic cylinder in either a forward direction or in a reverse direction by said pressurized air; (iv) a pair of piston rods operable in tandem, extended through one end of said pneumatic cylinder, and arranged to move conjointly with said pneumatic piston means, each piston rod being arranged to drive said plunger of a respective one of said chambers of said cartridge held by said frame toward said nozzle of said cartridge when said pneumatic piston mean sis driven in said forward direction, each piston rod being arranged to withdraw from said plunger when said pneumatic piston means is driven in said reverse direction; and (c) means predeterminedly adjustable by means of a user and operatively connected to said piston means for actuating said pneumatic control means so as to predeterminedly limit said conjoint movement of said pneumatic piston means and each piston rod in said forward direction beyond a predetermined amount of travel of said pneumatic piston means and said piston rods so as to enable said dispenser to eject an adjustably controlled dose of said mixed parts of said adhesive from said cartridge held by said frame.

Claim 14

A pneumatically actuatable dispenser for a two-part adhesive, as provided within a cartridge having two chambers, each containing one of two parts of said adhesive, said cartridge having a first end and a second end, and a mixing nozzle mounted upon said first end and arranged to receive one of said parts of said adhesive from each chamber and to mix said parts together, each chamber having a plunger accessible from said second end and displaceable through said chamber, toward said nozzle, in which said parts of said adhesive are mixed, and through which said mixed parts of said adhesive are ejected, said dispenser comprising: (a) a frame adapted to hold said cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to said frame so as to support said frame with said cartridge held by said frame, said pneumatic mechanism including (i) a pneumatic cylinder fixed to said frame; (ii) pneumatic piston means arranged to be pneumatically driven within said pneumatic cylinder by said pressurized air; (iii) control means for selectively driving said pneumatic piston means within said pneumatic cylinder in either a forward direction or in a reverse direction by said pressurized air; (iv) a pair of piston rods operable in tandem, extended through one end of said pneumatic cylinder, and arranged to move conjointly with said pneumatic piston means, each piston rod being arranged to drive said plunger of a respective one of said chambers of said cartridge held by said frame toward said nozzle of said cartridge when said pneumatic piston mean sis driven in said forward direction, each piston rod being arranged to withdraw from said plunger when said pneumatic piston means is driven in said reverse direction; and (c) means predeterminedly adjustable by means of a user and operatively connected to said piston means for actuating said pneumatic control means so as to predeterminedly limit said conjoint movement of said pneumatic piston means and each piston rod in said forward direction beyond a predetermined amount of travel of said pneumatic piston means and said piston rods so as to enable said dispenser to eject an adjustably controlled dose of said mixed parts of said adhesive from said cartridge held by said frame.

Claim 15

A dispenser as set forth in claim 11, wherein: said pneumatic control means comprises a first fluid circuit for fluidically connecting said source of pressurized air to said pneumatic piston means so as to drive said pneumatic piston means in said forward direction, a first manually actuatable valve means for closing said first fluid circuit so as to permit said pressurized air to drive said pneumatic piston mean sin said forward direction, and a second valve means for opening said first fluid circuit so as to vent said pressurized air from said first fluid circuit and thereby prevent said pressurized air from driving said pneumatic piston means; and said actuating means comprises an actuator block adjustably mounted upon said pneumatic piston means for engaging said second valve means of said pneumatic control means at a predetermined location of said travel of said pneumatic piston means so as to open said first fluid circuit and vent said pressurized air from said first fluid circuit.

Claim 16

A dispenser as set forth in claim 11, wherein said pneumatic mechanism comprises: a manually actuatable valve arranged, when actuated manually with said pneumatic mechanism connected to said source of pressurized air, to divert said pressurized air entering said pneumatic mechanism; and a hose connected to and arranged to receive pressurized air from said valve.

Claim 17

A dispenser as set forth in claim 13, wherein: said pneumatic mechanism further comprises a nozzle connected to said hose.

Claim 18

A pneumatically actuatable dispenser for a two-part adhesive, as provided in a cartridge having two chambers, each containing one of two parts of the adhesive, the cartridge having a first end and a second end, having a mixing nozzle mounted to the first end and arranged to receive one part of the adhesive from each chamber and to mix such parts, each chamber having a plunger accessible from the second end and displaceable through such chamber, toward the nozzle, in which the parts of the adhesive are mixed, and through which the mixed parts of the adhesive are ejected, the dispenser comprising: (a) a frame adapted to hold such a cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to the frame so as to support the frame with such a cartridge held by the frame, the pneumatic mechanism comprising: (i) a pneumatic cylinder affixed to the frame; (ii) a pneumatic piston arranged to be pneumatically driven within the cylinder, selectively in a forward direction or in a reverse direction; (iii) a pair of piston rods operable in tandem, extended through one end of the pneumatic cylinder, and arranged to move conjointly with the pneumatic piston, each piston rod being arranged to drive the plunger of a respective one of the chambers of such a cartridge held by the frame toward the nozzle of the last-mentioned cartridge when the pneumatic piston is driven in a forward direction, each piston rod being arranged to withdraw from the last-mentioned plunger when the pneumatic piston is driven in the reverse direction; (iv) pneumatic valves comprising: (1) a manually actuatable first valve arranged, when actuated manually with the pneumatic mechanism connected to a source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the forward direction; (2) a manually actuatable second valve arranged, when actuated manually with the pneumatic mechanism connected to a source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the reverse direction; and (3) a mechanically actuatable third valve arranged, when actuated mechanically while the first valve is actuated, to block pressurized air from flowing from the first valve into the pneumatic cylinder and simultaneously to vent pressurized air, as delivered previously by the first valve, from the pneumatic cylinder to ambient atmosphere; and (c) means adjustable by a user for limiting conjoint movement of the pneumatic piston and each piston rod in the forward direction so as to enable the dispenser to eject an adjustably controlled dose of the mixed parts of an adhesive from such a cartridge held by the frame, the means comprising: (i) a first control rod arranged to be conjointly driven with the pneumatic piston, along an exterior surface of such a cartridge held by the frame, without interfering with the last-mentioned cartridge; (ii) a second control rod arranged to be selectively linked to or unlinked from the first control rod so as to move conjointly with the first control rod, in parallel relation to the first control rod, when linked to the first control rod, and so as to be independently movable when unlinked from the first control rod; (iii) means operable manually and selectively by a user to link the second control rod to the first control rod, at any position within a range of possible positions along the first control rod, or to unlink the second control rod from the first control rod; (iv) an actuator positionable adjustably along the second control rod, at any position within a range of possible positions along the second control rod, for conjoint movement with the second control rod, the actuator being arranged to actuate the third valve upon conjoint movement of the first control rod, the second control rod, and the actuator from respective dose-initiating positions relative to the pneumatic cylinder, where the piston rods can begin to drive the plungers of such a cartridge held by the frame toward the nozzle of the last-mentioned cartridge, to respective dose-concluding positions relative to the pneumatic cylinder, where the plungers of the last-mentioned cartridge have been displaced by a distance correlating to a controlled dose of the mixed parts of the adhesive from the last-mentioned cartridge; whereby the actuator can be adjustably positioned along the second control rod so as to enable the dispenser, when the second control rod is linked to the first control rod, to eject a controlled dose of the mixed parts of an adhesive from such a cartridge held by the frame with the last-mentioned dose being less than full contents of the last-mentioned cartridge.

Claim 19

A pneumatically actuatable dispenser for a two-part adhesive, as provided in a cartridge having two chambers, each containing one of two parts of the adhesive, the cartridge having a first end and a second end, having a mixing nozzle mounted to the first end and arranged to receive one part of the adhesive from each chamber and to mix such parts, each chamber having a plunger accessible from the second end and displaceable through such chamber, toward the nozzle, in which the parts of the adhesive are mixed, and through which the mixed parts of the adhesive are ejected, the dispenser comprising: (a) a frame adapted to hold such a cartridge; (b) a pneumatic mechanism connectable to a source of pressurized air and attached to the frame so as to support the frame with such a cartridge held by the frame, the pneumatic mechanism comprising: (i) a pneumatic cylinder affixed to the frame; (ii) a pneumatic piston arranged to be pneumatically driven within the cylinder, selectively in a forward direction or in a reverse direction; (iii) a pair of piston rods operable in tandem, extended through one end of the pneumatic cylinder, and arranged to move conjointly with the pneumatic piston, each piston rod being arranged to drive the plunger of a respective one of the chambers of such a cartridge held by the frame toward the nozzle of the last-mentioned cartridge when the pneumatic piston is driven in a forward direction, each piston rod being arranged to withdraw from the last-mentioned plunger when the pneumatic piston is driven in the reverse direction; (iv) pneumatic valves comprising: (1) a manually actuatable first valve arranged, when actuated manually with the pneumatic mechanism connected to a source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the forward direction; (2) a manually actuatable second valve arranged, when actuated manually with the pneumatic mechanism connected to a source of pressurized air, to deliver pressurized air from the source to the pneumatic cylinder so as to drive the pneumatic piston in the reverse direction; and (3) a mechanically actuatable third valve arranged, when actuated mechanically while the first valve is actuated, to block pressurized air from flowing from the first valve into the pneumatic cylinder and simultaneously to vent pressurized air, as delivered previously by the first valve, from the pneumatic cylinder to ambient atmosphere; and (c) means adjustable by a user for limiting conjoint movement of the pneumatic piston and each piston rod in the forward direction so as to enable the dispenser to eject an adjustably controlled dose of the mixed parts of an adhesive from such a cartridge held by the frame, the means comprising: (i) a first control rod arranged to be conjointly driven with the pneumatic piston, along an exterior surface of such a cartridge held by the frame, without interfering with the last-mentioned cartridge; (ii) a second control rod arranged to be selectively linked to or unlinked from the first control rod so as to move conjointly with the first control rod, in parallel relation to the first control rod, when linked to the first control rod, and so as to be independently movable when unlinked from the first control rod; (iii) means operable manually and selectively by a user to link the second control rod to the first control rod, at any position within a range of possible positions along the first control rod, or to unlink the second control rod from the first control rod; (iv) an actuator positionable adjustably along the second control rod, at any position within a range of possible positions along the second control rod, for conjoint movement with the second control rod, the actuator being arranged to actuate the third valve upon conjoint movement of the first control rod, the second control rod, and the actuator from respective dose-initiating positions relative to the pneumatic cylinder, where the piston rods can begin to drive the plungers of such a cartridge held by the frame toward the nozzle of the last-mentioned cartridge, to respective dose-concluding positions relative to the pneumatic cylinder, where the plungers of the last-mentioned cartridge have been displaced by a distance correlating to a controlled dose of the mixed parts of the adhesive from the last-mentioned cartridge; whereby the actuator can be adjustably positioned along the second control rod so as to enable the dispenser, when the second control rod is linked to the first control rod, to eject a controlled dose of the mixed parts of an adhesive from such a cartridge held by the frame with the last-mentioned dose being less than full contents of the last-mentioned cartridge.

Claim 20

The dispenser of claim 15 wherein the means operable manually and selectively by a user comprises a linking lever attached to one end of the second control rod so as to retain the linking lever on the end of the second control rod but to permit a limited range of pivotal movement of the linking lever on the end of the second control rod, the linking lever having an aperture, through which the first control rod extends with a loose fit allowing the first control rod to pass freely through the aperture except when pivotal movement of the linking lever causes the linking lever frictionally to engage the first control rod, means for biasing the second control rod in the rearward direction, and means operable manually by a user to position the linking lever selectively in a pivotal position permitting the first control rod to pass freely through the aperture or in a pivotal position causing the linking lever frictionally to engage the first control rod as mentioned.

Claim 21

The dispenser of claim 16 wherein the means operable manually by a user to position the linking lever comprises a cam mounted operatively in fixed relation to the pneumatic cylinder and arranged to be manually adjusted between a condition wherein the cam engages and is interposed between the linking lever and adjacent structure so as to position the linking means in the pivotal position permitting the first control rod to pass freely through the aperture and a condition wherein the cam permits the means for biasing the second control rod in the rearward direction to pivot the linking lever, by means of the second control rod, to a pivotal position causing the linking lever frictionally to engage the first control rod as mentioned.

Claim 22

The dispenser of claim 16 wherein the means operable manually by a user to position the linking lever comprises a cam mounted operatively to the linking lever and arranged to be manually adjusted between a condition wherein the cam engages and is interposed between the linking lever and adjacent structure so as to position the linking means in the pivotal position permitting the first control rod to pass freely through the aperture and a condition wherein the cam permits the means for biasing the second control rod in the rearward direction to pivot the linking lever, by means of the second control rod, to a pivotal position causing the linking lever frictionally to engage the first control rod as mentioned.

Claim 23

The dispenser of claim 15 wherein the pneumatic mechanism comprises a manually actuatable fourth valve arranged, when actuated manually with the pneumatic mechanism connected to the source of pressurized air, to divert pressurized air entering the pneumatic mechanism, along with a hose connected to and arranged to receive pressurized air from the fourth valve.

Claim 24

The dispenser of claim 19 wherein the pneumatic mechanism comprises a nozzle connected to the hose.