Abstract: A curable liquid dispensing pen has a pen body to which a curable liquid dispensing reservoir may be removably attached. The pen body further has a coupling which may be coupled to a source of pressurized air. The air is directed through a passage in the pen body to the reservoir. The pressurized air moves a piston in the reservoir to cause curable liquid to be dispensed from the reservoir. A controller provides a timed pulse of pressurized air to the curable liquid dispensing pen and this controls the volume of curable liquid dispensed from the reservoir.

Abstract: A curable liquid dispensing pen has a pen body to which a curable liquid dispensing reservoir may be removably attached. The pen body further has a coupling which may be coupled to a source of pressurized air. The air is directed through a passage in the pen body to the reservoir. The pressurized air moves a piston in the reservoir to cause curable liquid to be dispensed from the reservoir. A controller provides a timed pulse of pressurized air to the curable liquid dispensing pen and this controls the volume of curable liquid dispensed from the reservoir.

Abstract: A dispenser for viscous fluids includes a tubular cylindrical barrel member, a dispensing nozzle on one end of the barrel member and a piston element which is sealingly received in the barrel member and slidable therein in a direction toward the nozzle for dispensing a viscous fluid from the barrel member. The barrel member and the piston element are constructed so that the piston element is freely slidable in a reverse direction in the barrel member to relieve the pressure on the fluid in the barrel member after a dispensing operation has been completed and to thereby eliminate post extrusion from the dispenser. The dispenser is operative in combination with a dispenser gun which includes a drive plunger and an advancing mechanism which is operative for advancing the drive plunger in order to advance the piston element of the dispenser in the barrel member thereof.