A trigger assembly can be used to activate a motor controller to cause a motorized device to respond in a certain manner. For example, when the motorized device is a power tool, based on a number of pulls of the trigger, the motor controller can run the power tool in a forward direction or a reverse direction. A power tool running in the forward direction can receive a tap of the trigger. A timer can be started upon detecting the pull of the trigger. Another tap of the trigger can be detected within a time period determined based on the timer. The power tool can be forced to perform a reverse operation when the other tap f the trigger is within the time period.

Methods, apparatus, devices and systems for mixing and dispensing multi-component materials. The mixing and dispensing may be performed using a mobile, enclosed dispenser that can be used to supply a mixed multi-component material at the point of use. In some embodiments, the components to be mixed into the multi-component material may be supplied in cartridges.

A discharge device capable of suppressing pressure fluctuation of a compressed gas supplied to a container in which a liquid material is stored. The device includes a storage container in which a liquid material is stored; a discharge port through which the liquid material is discharged; a pressure control valve that adjusts a pressure of a compressed gas supplied from an external compressed gas source to a desired level; a discharge valve that establishes or cuts off communication between the pressure control valve and the storage container; a control device that controls operation of the discharge valve; a first flow line connecting the pressure control valve and the discharge valve; and a second flow line connecting the discharge valve and the storage container. The device further includes a third flow line branched from the first flow line, and a leak mechanism connected to the third flow line.

A method, computer program product, and apparatus for receiving, at a fluid dispensing apparatus, a control signal, wherein the control signal may be received from a base station, wherein the control signal, when received, may cause the fluid dispensing apparatus to perform operations. The operations may include generating a positive pressure within a fluid cartridge of the fluid dispensing apparatus by adjusting, via a motor of the fluid dispensing apparatus, a drive rod and piston of the fluid dispensing apparatus in a first direction relative to the fluid cartridge to dispense fluid in the fluid cartridge via a nozzle of the fluid dispensing apparatus. The operations may include generating a negative pressure within the fluid cartridge by adjusting, via the motor, the drive rod and piston in a second direction relative to the fluid cartridge to draw fluid into the fluid cartridge via the nozzle.

A discharge device capable of suppressing pressure fluctuation of a compressed gas supplied to a container in which a liquid material is stored. The device includes a storage container in which a liquid material is stored; a discharge port through which the liquid material is discharged; a pressure control valve that adjusts a pressure of a compressed gas supplied from an external compressed gas source to a desired level; a discharge valve that establishes or cuts off communication between the pressure control valve and the storage container; a control device that controls operation of the discharge valve; a first flow line connecting the pressure control valve and the discharge valve; and a second flow line connecting the discharge valve and the storage container. The device further includes a third flow line branched from the first flow line, and a leak mechanism connected to the third flow line.

An improved dispensing device for application and dispensing of viscous liquid substances comprising of a storage reservoir, dosing mechanism with audible and tactile feedback, dispensing plunger, nozzle tip, and end of travel pressure release mechanism. The dosing and the dispensing are de-coupled, allowing a preselection of dosage volume and controlled dispensing. A pressure relief mechanism is incorporated to eliminate oozing of liquids after the termination of dispensing.

The present invention relates to a caulking gun for dispensing viscous material comprising a stock a cartridge keep a push rod longitudinally moveably mounted in the stock provided at its one end with a plunger which engages the piston of a cartridge placed in the cartridge keep, means for engaging the push rod to advance it, brake means hinged to the stock and provided with a clearance hole for engaging the push rod such that the push rod is moveable in a direction advancing the push rod towards the cartridge and is held in a direction retreating the push rod from the cartridge, which brake means are arranged to travel to a first position relative to the stock as the push rod advances and to a second position as the push rod retreats thereby defining the retreat of the push rod, the brake means being inclined relative to the axis of the push rod and adjusting means for varying the retreat of the push rod. In order to provide an adjustable caulking gun with at least two different levels of retreat of the push rod giving the user easily a visual feedback of the chosen retreat of the push rod, it is proposed according to the present invention that the adjusting means are configured as a rotatable wheel with a slope, the rotatable wheel being positioned on the axis of the push rod between the stock and the brake means, the distance between the highest point of the slope and the brake means defining the retreat of the push rod. This rotatable wheel allows the user to select the level of retreat of the push rod by turning the wheel between a first position with no retreat of the push rod and a second position with a maximum retreat of the push rod resulting in a anti-drip behavior of the caulking gun.

A liquid compound dispensing apparatus for dispensing a controlled amount of liquid compound onto a workpiece is described. The apparatus comprises a cartridge system. The cartridge system may accept a liquid compound cartridge containing liquid compound. The apparatus also comprises a plate, having a threaded bore, positioned above the cartridge system that is movable in a first and second direction, at least one plunger attached to the plate at a first end and attached to a piston at a second end. The piston is dimensioned to move within the liquid compound cartridge to displace liquid compound when the plate is moved in the second direction. A driving mechanism moves the plate in the first and the second directions to dispense product and comprises a motor, a threaded rod disposed through the threaded bore of the plate that is driven by a driving belt attached to the motor.

A retractable nozzle assembly is configured for dosing or dispensing highly viscous materials. The retractable nozzle assembly may be fitted to a delivery device containing a highly viscous chemical product to be dispensed. The retractable nozzle assembly may be actuated by hand, by mechanical action, or by any electromechanical device such as a dispenser. The retractable nozzle assembly includes a first path through a central bore in which the material moves at relatively slower flow rate and a secondary flow path in which the material moves at a relatively faster flow rate. The difference in flow rates at the outlet of the nozzle between the two flow paths helps to eliminate stringing and tailing of the high viscosity chemical product during dispensation.

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.