A pneumatic dispenser for dispensing viscous material, for example, mastic caulk, from a container is described. The dispenser comprises a fluid supply arrangement for accepting a dispensing nozzle of the container and providing a flow of pressurized fluid to the dispensing nozzle to enable the material to be dispensed as a spray. A moveable member can be used to control the flow of pressurized fluid, for example a member disposed on a cap for closing a container containing compartment of the dispenser and/or a moveable member disposed around the dispensing nozzle. The arrangement of the fluid supply arrangement allows for convenient control of the pressurized fluid flow for spraying the material. Also disclosed is a dispenser with a readily exchangeable pressure application interface for applying a dispensing pressure to the container, enabling the dispenser to be used with both cartridge and foil pack containers.
1. A dispenser for dispensing a viscous material from a container through a dispensing nozzle, the dispenser comprising a fluid supply arrangement for accepting the dispensing nozzle through a nozzle receiving space and for supplying pressurized fluid to the nozzle receiving space through one or more fluid supply ports, wherein the fluid supply arrangement comprises first, second and third members for accepting the dispensing nozzle therethrough, wherein the third member is constrained for rotation relative to the first member, wherein the second and third members are coupled such that rotation of the third member relative to the first member and the second member causes translation of the second member relative to the first member between a first configuration in which the one or more fluid supply ports are closed and a second configuration in which the one or more fluid supply ports are open to supply fluid to the nozzle receiving space, and wherein the second member is arranged to removably accept a spray nozzle around the dispensing nozzle.
2. The dispenser of claim 1 wherein the second member is closer to the first member in the first configuration than in the second configuration.
3. The dispenser of claim 1 wherein a region of the second member is disposed in a channel between an inner wall and an outer wall of the first member, the outer wall and the region of the second member cooperatively defining the one or more supply ports.
4. The dispenser of claim 1 wherein the fluid supply arrangement includes first and second supply port seals between the first and second members, the second member including an opening, disposed between the first and second supply port seals in the second configuration and to one side of the first and second supply port seals in the first configuration, for each supply port.
5. The dispenser of claim 1 wherein the first and second members are part of a cap for closing a container accepting compartment of the dispenser.
6. The dispenser of claim 5 wherein the compartment defines a fluid supply path between an outer compartment wall and an inner compartment wall, and the first member has a first seal for sealing against the outer wall of the compartment and a second seal for sealing against the inner wall of the compartment and defines a fluid path from between the seals to the one or more supply ports.
7. The dispenser of claim 1 , further comprising a spray nozzle having a first end arranged to removeably couple to the second member of the dispenser to guide the pressurized fluid past a dispensing end of the dispensing nozzle when the first and second members are disposed in the second configuration.
8. The dispenser of claim 7 wherein the spray nozzle comprises one or more ribs for engaging the dispensing nozzle to provide a passage for pressurized fluid along the dispensing nozzle.
9. The dispenser of claim 7 wherein an end portion of the spray nozzle at a second end, opposed to the first end, is configured to mate with an end portion at the dispensing end of the dispensing nozzle to reduce ingress of dispensed material between the end portions when the end portions mate.
10. The dispenser of claim 7 , wherein the dispenser, the spray nozzle and the dispensing nozzle are included in a kit of parts.
11. The dispenser of claim 1 , further comprising a front cap arranged to mate with the dispenser, the front cap including the fluid supply arrangement and the second member being secured to the front cap.