Abstract: A caulking gun includes a stock having a handle, a piston rod slidably attached to the stock and movable forwardly and rearwardly relative to the stock, the piston rod includes a front portion, and a plunger attached to the front portion, the plunger including a head attached to the front portion, and the plunger including a pusher having an opening formed in an upper portion of the pusher for receiving and engaging with the head and for securing the head to the pusher. The pusher includes an inner peripheral channel formed in the upper portion and communicating with the opening of the pusher for receiving and engaging with the head. The pusher includes a spring latch on the upper portion for engaging with the head and for locking the head to the pusher and for preventing the pusher from being disengaged from the head.

Abstract: A caulking gun includes a housing having a channel opened upwardly, a supporting bracket engageable into the channel of the housing and having an opening for detachably attaching a cartridge member, and a latch device having a latch member slidably attached to the housing and movable relative to the housing for selectively engaging with the supporting bracket and for preventing the supporting bracket and the cartridge member from being disengaged from the housing. The latch member includes two anchors engageable into the channel of the housing for engaging with the supporting bracket and for preventing the supporting bracket and the cartridge member from being disengaged from the housing.

Abstract: A caulking gun includes a housing forming a handle and supporting a cartridge holder for receiving and holding a caulking cartridge. A flexible push plate is received through the housing to have a front end extending into the cartridge holder to carry a push disk. The housing has front and rear portions respectively receiving therein an advancer and a gripper through which the push plate extends. A guide roller is rotatably received in the housing rearward of the gripper. A rear end of the push plate extends through the gripper and is wrapped around the guide roller for further extension frontward to project outside and above the cartridge holder. When a trigger of the handle comprising a trigger is actuated to cause the advancer to advance the push plate frontward for extrusion of the caulking cartridge to dispense caulking, the gripper holds and prevents the push plate from returning rearward.