The invention relates to a device for applying liquid to a surface, specifically, the invention is a tool for storing and coating paint.

The technical background paint brush and paint roller of the invention are well-known tools for applying paint to the surface of buildings and walls. When painting a large surface, the paint roller and paint tray are still the best choices for painters and people who do it by themselves, because they are not expensive and can be used to apply paint all the time. However, it often brings many new ideas and inventions to the demand for roller paint replenishment.

The prior art discloses a combination of an internal paint storage room and a single or multiple rollers. For example, US Patent No. 3905295 and 4167349; And the list of patents in No. 4555195. These prior art paint brushes with internal paint storage room and roller have a common feature that the paint in the storage room is applied to the outer surface of the roller before the paint is applied to the target surface.

The reason why these painting brushes in the prior art are not seen in the market may be that they are expensive, difficult to maintain and troublesome to use. The high price is due to a large number of auxiliary rollers besides the main rollers. In addition, the complex structure and operation of the paint brush disclosed in U.S. Patent No. 3905295 and 4555195 indicate that it can only be used once at most, because the condensed paint will jam the intermediate drum. Finally, the paint storage room in the prior art is arranged quite far from the longitudinal axis of the main drum. Because the storage room is heavy after being filled with paint, the center of gravity of the paint drum in the prior art will leave the longitudinal axis of the drum. As a result, users found that these paint rollers were more flexible than ordinary paint rollers.

One of the purposes of the invention is to only reduce the number of paint drum parts without endangering the convenience and maintainability of the paint drum in the prior art.

Another purpose of the invention is to add a paint roller to an internal storage room to distribute paint conveniently without interrupting the user's painting work.

Another purpose of the invention is to shorten the distance between the internal storage room and the longitudinal axis of the drum, so that users can enhance the controllability and touch when using the drum on the target surface.

Brief description of the invention The invention is a paint roller, which includes an internal storage room set in the inner space of the roller to receive and distribute paint. The inner part of the drum is connected with the outer surface of the drum through several notches on the drum. A applicator is placed on the outer surface of the drum. The paint present in the internal storage room is evenly and automatically distributed on the gap and applicator for application to the target surface. A wall part is installed in the internal storage room of the drum to store residual paint when the drum is parked in a vertical or similar vertical position. Because the center of gravity of the storage room is close to the longitudinal axis of the roller, the user can obtain the maximum operability and the true touch of the paint roller to apply the paint to the target surface.