A caulking gun is provided, including: a gun body, including a side wall and for a sealant cartridge to be assembled thereto; a limitation member, swingably assembled to the gun body; a pushing rod, movably disposed in the gun body and disposed through the limitation member and the side wall, the pushing rod optionally frictionally gripped by the limitation member for pushing the sealant cartridge; an abutting mechanism, movably disposed through the side wall and radially disengageable directly from the pushing rod, two ends of the abutting mechanism respectively abutting against the driving member and the limitation member, the abutting mechanism including an abutting portion and an elastic member, the elastic member being arranged between the abutting portion and the driving member.

A dispensing gun assembly includes a frame, a rod, a piston, a driver, a trigger, and a linkage. The rod slideably connects with the frame for linear movement with respect to the frame. The piston connects with the rod for movement with the rod. The driver selectively engages with the rod to move the rod in a linear direction when engaged with the rod. The trigger slideably connects with the frame. The linkage connects the trigger with the driver such that linear movement of the trigger with respect to the frame in a rearward direction results in the driver engaging the rod and linear movement of the rod and the piston in a forward direction.

A dispenser for dispensing a viscous material contained in a flexible package includes a body extending along a longitudinal axis that has a first end, an opposite second end, a cavity configured to receive the flexible package, and a handle assembly coupled to the first end. The handle assembly has a fixed handle, a trigger pivotally coupled to the fixed handle, and a rod extending between the fixed handle and the trigger into the cavity. A plurality of dispensing valves are positioned at the second end of the body and configured to dispense the viscous material, and a piston is movably disposed in the cavity for engagement with the flexible package. As the trigger is pivoted toward the fixed handle, the rod moves along the longitudinal axis toward the piston such that the piston engages the flexible package and the viscous material dispenses through the plurality of dispensing valves.

A dispenser for dispensing a viscous material contained in a flexible package includes a body extending along a longitudinal axis that has a first end, an opposite second end, a cavity configured to receive the flexible package, and a handle assembly coupled to the first end. The handle assembly has a fixed handle, a trigger pivotally coupled to the fixed handle, and a rod extending between the fixed handle and the trigger into the cavity. A plurality of dispensing valves are positioned at the second end of the body and configured to dispense the viscous material, and a piston is movably disposed in the cavity for engagement with the flexible package. As the trigger is pivoted toward the fixed handle, the rod moves along the longitudinal axis toward the piston such that the piston engages the flexible package and the viscous material dispenses through the plurality of dispensing valves.