A grease discharge device includes a motor, a plunger, a grease supply unit, a pump, a check valve, and a relief valve. The plunger reciprocates by driving of the motor. The grease supply unit supplies grease to a forward movement side with respect to a backward movement side dead center of the plunger. The pump performs a discharge behavior of the grease by the reciprocation of the plunger. The check valve is disposed at a downstream side with respect to a forward movement side dead center of the plunger in a discharge path of the grease inside the pump. The relief valve is disposed between a supply portion of the grease by the grease supply unit and the check valve. The relief valve releases the grease inside the discharge path to the grease supply unit side according to a pressure rise inside the discharge path.

The present invention relates to a grease injection nipple coupled to a grease pipe such that the same can function as an opening/closing valve with regard to the corresponding grease pipe, the grease injection nipple being pushed against a nipple of a grease supply target and coupled thereto or separated therefrom. The grease injection nipple according to the present invention comprises a push body, a check valve, a nipple coupling portion, and a valve activation portion. The valve activation portion may operate such that, when the push body makes a primary movement in the forward direction, the check valve is opened and, when the push body makes a secondary movement in the forward direction after external force for the primary movement of the push body is released, the check valve is closed.

The present invention relates to a grease injection nipple coupled to a grease pipe such that the same can function as an opening/closing valve with regard to the corresponding grease pipe, the grease injection nipple being pushed against a nipple of a grease supply target and coupled thereto or separated therefrom. The grease injection nipple according to the present invention comprises a push body, a check valve, a nipple coupling portion, and a valve activation portion. The valve activation portion may operate such that, when the push body makes a primary movement in the forward direction, the check valve is opened and, when the push body makes a secondary movement in the forward direction after external force for the primary movement of the push body is released, the check valve is closed.

A grease gun is provided comprising a body having a reservoir bore with a plurality of grooves; a grease reservoir is in communication with the reservoir bore and has a reservoir groove on an outside surface of the reservoir. A retention fastener is received by a groove and is in operational engagement with the reservoir groove to removably retain the reservoir. The retention fastener may be connected to a fastener bracket via an aperture. The bracket is connected to a push-button via a connection mechanism. The grease reservoir may be removed or mounted to the connection aperture by exerting force on the button which transfers the force to the bracket via the connection mechanism. The force causes movement of the bracket along the aperture which deforms the retention fastener to allow the grease reservoir to be mounted/removed.

A grease gun is provided comprising a body having a reservoir bore with a plurality of grooves; a grease reservoir is in communication with the reservoir bore and has a reservoir groove on an outside surface of the reservoir. A retention fastener is received by a groove and is in operational engagement with the reservoir groove to removably retain the reservoir. The retention fastener may be connected to a fastener bracket via an aperture. The bracket is connected to a push-button via a connection mechanism. The grease reservoir may be removed or mounted to the connection aperture by exerting force on the button which transfers the force to the bracket via the connection mechanism. The force causes movement of the bracket along the aperture which deforms the retention fastener to allow the grease reservoir to be mounted/removed.

A system and method of performing maintenance on a wing cock valve coupled to a pressurized gas delivery pipe is provided. The method removing a plug from a port on the valve. A threaded portion of a grease tool is coupled to the port, the grease tool having a body coupled to the threaded portion and a fitting on an opposite end, the fitting, body and threaded portion defining a flow path. A hose is coupled on a grease gun to the fitting; and actuating the grease gun to flow a grease from a reservoir through the flow path and into the valve.

A system and method of performing maintenance on a wing cock valve coupled to a pressurized gas delivery pipe is provided. The method removing a plug from a port on the valve. A threaded portion of a grease tool is coupled to the port, the grease tool having a body coupled to the threaded portion and a fitting on an opposite end, the fitting, body and threaded portion defining a flow path. A hose is coupled on a grease gun to the fitting; and actuating the grease gun to flow a grease from a reservoir through the flow path and into the valve.

A joint structure of high pressure grease gun tubing is an oil pipe connected to a high pressure grease gun, and the end of the oil pipe is connected with a rotatable joint, and the joint includes a joint connected with the oil pipe for that the grease can pass through the middle through hole, and the end of the joint is sequentially provided with a first shaft part, a second shaft part with an outer diameter slightly larger than the first shaft part and a caulking groove for the oil sealing washer and the oil sealing ring to be sleeved, and a rotary joint has the thread on the outside end and the grease can pass in its middle. The inside end of the rotary joint is embedded into the caulking groove of the joint, and a first coupling part for coupling of the first shaft part is arranged in the middle of the rotary joint, which is closely fitted with the oil sealing ring and the oil sealing washer. A second coupling part for coupling of the second shaft part makes that the rotary joint can be rotated on the joint without falling out, and that it is easier to connect with the grease nozzle of the lubricating grease, and also there is no leakage under the action of high pressure grease.

A grease gun with an adjustable operating angle includes: a grease barrel having a first annular assembling portion and a first annular pivot portion; a gun body having a second annular assembling portion facing the first annular assembling portion and a second annular pivot portion to be pivotally disposed on the first annular pivot portion; a positioning ring fixed to the second annular assembling portion and having annularly arranged positioning cavities and facing the first annular assembling portion; and a positioning unit having a positioning member movable between a locked position and a release position, and the positioning member having a positioning portion to be inserted into or disengaged from the positioning cavities. The grease barrel and the gun body can be rotated and fixed relative to each other after rotation to adjust the angle between the two, which consequently reduces the space limitation on the grease feeding operation.

A grease gun with an adjustable operating angle includes: a grease barrel having a first annular assembling portion and a first annular pivot portion; a gun body having a second annular assembling portion facing the first annular assembling portion and a second annular pivot portion to be pivotally disposed on the first annular pivot portion; a positioning ring fixed to the second annular assembling portion and having annularly arranged positioning cavities and facing the first annular assembling portion; and a positioning unit having a positioning member movable between a locked position and a release position, and the positioning member having a positioning portion to be inserted into or disengaged from the positioning cavities. The grease barrel and the gun body can be rotated and fixed relative to each other after rotation to adjust the angle between the two, which consequently reduces the space limitation on the grease feeding operation.