Abstract: A storage chair includes a cylindrical chair body and a cover body. The cylindrical chair body has a closed end and an opening end opposite to each other, and an accommodation space is formed in the cylindrical chair body between the closed end and the opening end. The cover body removably covers the opening end of the cylindrical chair body. The accommodation space of the cylindrical chair body can be used for accommodating substances to be stored, and is covered by the cover body, which enables the chair to have functions both of seating and storage.

Abstract: A retractable writing/erasing piece against sliding back includes a holding pipe, an internal pipe, a sleeve pipe, a slide base and a writing/erasing piece. At least a pair of stepped guide grooves is disposed on a pipe wall of the internal pipe and the stepped guide grooves have multiple guide groove windows. At least a pair of spiral guide slots is disposed on an internal wall of the sleeve pipe. At least a pair of guide protrusions is disposed on the slide base. The pair of guide protrusions is contained in the pair of spiral guide slots. The guide protrusions are abutted against a blocking wall of a guide groove window therein, so that an accident sliding back of the writing/erasing piece and the slide base can be avoided.

Abstract: A retractable writing/erasing piece against sliding back is provided, including a holding pipe, an internal pipe, a sleeve pipe, a slide base and a writing/erasing piece. At least a pair of stepped guide grooves is disposed on a pipe wall of the internal pipe and the stepped guide grooves have multiple guide groove windows. At least a pair of spiral guide slots is disposed on an internal wall of the sleeve pipe. At least a pair of guide protrusions is disposed on the slide base. The pair of guide protrusions is contained in the pair of spiral guide slots. The guide protrusions are abutted against a blocking wall of a guide groove window therein, so that an accident sliding back of the writing/erasing piece and the slide base can be avoided.

Abstract: An ink feeder for a felt-tip ink pen and communicable with an ink reservoir defined in the ink pen includes a main body made of a rigid material to internally define a feeding bore; a plurality of micro raised portions radially inward protruded from and circumferentially spaced along an inner wall surface of the main body for clamping a felt tip of the ink pen in place; and a plurality of ink feeding clearances each being formed between two adjacent ones of the micro raised portions and communicable with the feeding bore, so that ink stored in the ink reservoir of the ink pen is fed to the felt tip via the ink feeding clearances. The rigid main body and other ink pen components can be assembled to form the ink pen in an automated manner, and the ink feeding clearances ensure smooth ink feeding without the risk of leakage.

Abstract: An ink feeder for a felt-tip ink pen and communicable with an ink reservoir defined in the ink pen includes a main body made of a rigid material to internally define a feeding bore; a plurality of micro raised portions radially inward protruded from and circumferentially spaced along an inner wall surface of the main body for clamping a felt tip of the ink pen in place; and a plurality of ink feeding clearances each being formed between two adjacent ones of the micro raised portions and communicable with the feeding bore, so that ink stored in the ink reservoir of the ink pen is fed to the felt tip via the ink feeding clearances. The rigid main body and other ink pen components can be assembled to form the ink pen in an automated manner, and the ink feeding clearances ensure smooth ink feeding without the risk of leakage.