A two-component piston for a cartridge includes a piston cover as the first component and a piston body as the second component. The piston has a first side and a second side, and a rear side of the piston cover arranged adjacent to at least a part of the piston body. A front side of the piston cover is arranged at the first side, and the rear side of the piston cover includes a valve member. The valve member is to be received within the piston body and to extend into the piston body towards the second side. The piston cover is configured to be moved relative to the piston body on actuation of the valve member and the piston cover is non-releasably connected to the piston body.

A dispenser includes a body (10) the body including an asymmetric shape corresponding to a flattened product pouch. The body includes a row of teeth (42) extending longitudinally along the bottom of the body. A grip (28) is slidingly engaged with a bottom of the body and is coupled to a squeeze pusher (32) disposed within the interior space of the body. An actuator arm (30) is movably attached to the grip. A drive mechanism is movably attached to the actuator and is engageable with the row of teeth. For dispensing, movement of the actuator causes a corresponding movement of the drive mechanism which causes the grip and squeeze pusher to move relative to the body in a direction from the proximal end to the dispensing end, thus applying pressure to the pouch.

A method for dispensing fluid from a fluid dispensing apparatus. The apparatus may include a housing, wherein the housing may include a motor, and wherein the motor may be configured to be operatively connected to a power supply, wherein the motor may be further configured to be operatively connected to one or more drive rods, wherein the one or more drive rods may be configured to engage a fixed lead screw with a triangular nut, and wherein the drive rod may be further configured to engage at least two pistons of a fluid cartridge. The housing may include a controller configured to be operatively connected to the power supply, the controller may be configured to generate a pressure within the fluid cartridge by adjusting, via the motor, the drive rod and piston in a first direction relative to the fluid cartridge to dispense fluid in the fluid cartridge.

A piston includes: a base body; a sealing ring provided at an outer peripheral surface of the base body and configured to slidingly contact an inner peripheral surface of a container; a pressing body provided at one side of the base body in a non-hermetical state with respect to the container, the one side being close to a fluid; and a supporting member supporting the pressing body in a state where the pressing body is separated from the base body. The base body includes an air discharge hole through which an inside and outside of the container communicate with each other, the inside and outside of the container being sealed by the sealing ring. The pressing body can approach and separate from the base body between a first position at which the pressing body opens the air discharge hole and a second position at which the pressing body closes the air discharge hole. The pressing body is supported by the supporting member at the first position and moves to the second position by force applied from the fluid in the container.

A system for finishing surfaces with a finishing material includes a handle assembly with proximal and distal ends. A material reservoir is mounted on the handle distal and includes an inlet and an outlet. A material applicator tool is mounted on the reservoir and receives material from the reservoir outlet. A discharge mechanism includes an extendable-retractable component or linear actuator connected to the reservoir for discharging or reloading material. Multiple embodiments utilizing different linear actuators are disclosed. An alternative embodiment includes a push-to-open valve mechanism. Additional embodiments include an adjustment mechanism on the push-to-open valve mechanism accommodating adjustment of flow of finishing compound when the push-to-open valve is engaged.

A grease gun cylinder walled cartridge adapted for direct attachment to any of a variety of grease gun head constructions and grease pumping systems, wherein the cartridge wall can be of any color or completely clear and see through, wherein the grease column within the cartridge is pressured toward and through an inlet port in the gun head, which port opens on the suction stroke of a piston mounted in said cylinder into a loading portion of a cylinder of the grease pumping system, and wherein the grease column pressuring means is ambient air pressure.

A cartridge assembly includes a cartridge and a sleeve, the cartridge having a solid head part and a cartridge wall formed by a film integrally formed with the head part, the cartridge being received in the sleeve.

Plungers (50) for use in sealant dispensing cartridges with collapsible sealant packaging (40) are disclosed. The plungers include anti-bypass retainers (60) to reduce or prevent unwanted passage of the flexible sealant packaging around the edges of the plungers during sealant dispensing operations.

Various aspects and embodiments are directed to a precision dispenser that is hand held and constructed and arranged to receive and release a variety of glue cartridges. In various embodiments, the adhesive cartridges include precision tips that provide, for example, flat even bead with little or no spill or drip. Other precision tips can be constructed and arranged for use with the precision glue gun. In some examples, the precision tips can be tailored to the specific adhesive contained in the cartridge.

A handheld gun-type cannabis rosin oil press and dispenser is described and claimed having a piston feeding mechanism comprising a trigger arranged to drive clamping means to grasp a piston and move the piston towards a melt chamber of the gun to feed the piston face against the cannabis floral material in the melt chamber. The force of the piston combined with the precisely controlled heat of the chamber causes the extraction of rosin oil from the cannabis material and subsequent dispensing from the outlet orifice of the gun.