Abstract: A portable drywall joint compound pump station includes a pneumatic pump for pumping joint compound from a mud container. The pump has an inlet and an outlet, and is supported by a frame at a location above the bottom of the container. An intake tube depends from the pump inlet and has an inlet port located proximate to the bottom of the container when the station is in use. A valve is provided for controlling a supply of compound air to power the pump. The frame has four legs and includes mounting brackets that are used to mount the pump to the legs such that the pump resides substantially within an imaginary peripheral surface containing outer edges of the legs to form a protective cage around the pump.

Abstract: A portable drywall joint compound pump workstation supplies joint compound to a workstation outlet that is conveniently located. The workstation includes a joint compound supply reservoir having an open top, a pump that pumps joint compound from the supply reservoir, a portable cart that supports the supply reservoir and the pump, and a removable transport tube that feeds joint compound from the pump to the workstation outlet. With the transport tube in place the workstation outlet is held in a relatively stable position in the vicinity of the open top of the supply reservoir. The pump is located below the joint compound supply reservoir, and is a gravity-fed, pneumatic diaphragm pump. The pump inlet is connected to the bottom of the supply reservoir and the pump outlet is located beneath the pump inlet. The pump is thus self-draining. A compressed air manifold assembly including a plurality of compressed air supply ports is provided.

Abstract: An apparatus for applying joint compound is externally powered, preferably using compressed air. The preferred apparatus has a hollow tubular storage body that is connected to a supply of compressed air, and a movable plunger positioned within the hollow tubular storage body. The plunger has a pair of rubber seals that contact the inner wall of the storage body. A supply of joint compound is inserted into the storage body on the side of the plunger opposite the side of the plunger that can be exposed to pressurized air. Pressurized air can be supplied by the user against the plunger to push the supply of joint compound out of the storage body through a mud supply head. An applicator tip is connected to the mud supply head and can be connected to either a flat joint attachment or a corner joint attachment. Alternatively, other attachments can be used such as a texture gun attachment, a fireproofing attachment, or a water cleaning attachment.