Arukh HaShulchan, Orach Chaim 308:14-20

Sugya Map: The Definition of Kli and Tashmisho

• Issue: Does a vessel's status as a Kli depend on its primary purpose or its current, transient use?
• Nafka Mina: Whether one may move "vessels" that are being used for non-vessel functions (e.g., a board used as a table).
• Primary Sources: Shabbat 123a, Mishnah Berurah 308:44, Arukh HaShulchan (AH) 308:14-20.

Text Snapshot

• AH 308:14: "כל דבר המיוחד לתשמיש... ואין לו שם כלי, הרי הוא כלי."
• Nuance: The Arukh HaShulchan pivots from the formalistic definition of kli to a functionalist one. Note the use of "מיוחד" (designated)—intent defines the object, not its material composition.

Readings

• Rambam (Hilchot Shabbat 25:12): Focuses on tashmish—if it is designated for a function, it retains vessel status.
• Arukh HaShulchan (308:16): His chiddush is the democratization of the kli. He argues that even items lacking a formal "vessel" name are keilim if they serve a human need. He rejects the hyper-technical constraints of earlier authorities, favoring sevara (common sense).

Friction

• Kushya: If any object used for a purpose becomes a kli, how do we distinguish between Muktzah (e.g., a rock) and a Kli (e.g., a hammer)?
• Terutz: The AH differentiates between miuchad (designated for a specific task) and tashmish (incidental use). A rock is not miuchad; a board, even if not manufactured as a table, becomes miuchad the moment it is utilized as such.

Intertext

• SA Orach Chaim 308:3: Mirrors the distinction between k'li she-melachto le-issur vs. le-hetter.
• Responsa Igrot Moshe (OC 5:28): Discusses modern appliances; echoes the AH's functionalist approach by defining kli via utility rather than antiquity.

Psak/Practice

• Halacha: An object's status on Shabbat is fluid. If you designate an item for a constructive task (melachto le-issur), you may move it le-tzorech gufo (for the object's use).
• Heuristic: If it performs a "human" task, it is a kli. If it is merely matter, it is Muktzah.

Takeaway

Functionality creates status: in the Beit Midrash as in the home, if you designate an object for a purpose, you sanctify its utility, elevating it from mere matter to a kli.