Abstract: A grease control structure of a grease gun comprises a main body including an inlet end and an outlet end. A high-pressure flow passage and a low-pressure flow passage having a larger outer diameter than the high-pressure flow passage are disposed between the inlet and outlet ends. The high-pressure flow passage includes a first inlet and a second inlet, and both passages include a first pump rod and a second pump rod respectively. The first pump rod is pivotally connected to a pressing handle and the second pump rod is pivotally connected to a pressing handle through a switch mechanism used for adjusting the pivotal position of the second pump and pressing handle to change their original position in the low-pressure flow passage for the second pump rod to precede the piston movement to close or open the second inlet and define a high- or low-pressure outlet pressure.

Abstract: A dual-use type grease gun comprises a grease barrel and an end lid covering the grease barrel. A handle and a press-grip are disposed to a side of the end lid. A movable handgrip is slidably disposed on the press-grip, and a positioning component capable of positioning the movable handgrip is further disposed to the movable handgrip. The moment arm length of the press-grip can be changed to allow a user to select a single hand or both hands for operation by regulating the position of the movable handgrip relative to the press-grip according to different work environments and demands.

Abstract: A grease gun with a removable rotary tool comprises a connecting rod, a transmission mechanism, a push rod, and a connecting. The rotary tool which serves as a power source is removably mounted outside the body of the grease gun in such a manner that a connecting rod extends out of the body, such that the body is independent from the power source. The present invention can really save money for the consumers since the consumers only have to buy the body when need a grease gun, and the grease gun manufacturers don't need to produce the rotary tool F when producing grease gun, thus saving manufacturing cost.

Abstract: A grease gun with a pressure-relief device comprises a pressure-relief device. When the grease gun is subjected to an excessive driving force, the pressure-relief device will be pressed to allow the valve member of the pressure-relief device to compress the spring toward the cover member, and then the grease-passage port and the cartridge port will communicate with each other, so that the grease can flow back into the grease cartridge to further control the pressure in the grease gun, thus avoiding the damage to the grease gun and further extending the service life of the grease gun.

Abstract: A grease gun used by cooperating with a rotary tool comprises a connecting rod, a transmission mechanism and a push rod. The rotary tool drives the connecting rod to rotate, and then the connecting rod rotates the transmission mechanism, so as to make the push rod extrude grease from the grease gun. Since the grease gun is used by cooperating with the rotary tool, it is unnecessary to provide a power source in the grease gun, so that the cost is reduced.

Abstract: A power device for an electric grease gun comprises a first planetary disk, a first planetary gear set, a positioning bearing, a second planetary disk, a second planetary gear set and a ring gear. The first planetary gear set is pivotally disposed on the first planetary disk. The second planetary disk is assembled corresponding to the first planetary disk, and the positioning bearing is pivotally disposed between the first and second planetary disks. The second planetary gear set is pivotally disposed on the second planetary disk and is engaged with the combining portion of the first planetary disk. The ring gear is defined with a through hole for receiving the first and second planetary disks. The first and second planetary gear sets rotate in the ring gear via the positioning bearing, so as to perform speed reduction. In addition, the positioning bearing is used to reduce friction.