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A speed square, also called a rafter square, rafter angle square, and triangle square, is a multi-purpose triangular carpenters' tool used for marking out. Its functions encompass many of those offered by combination squares, try squares, and framing squares. Carpenters use it to make basic measurements and mark lines on dimensional lumber, and as a saw guide for short 45 and 90 degree cuts.
The term "speed square" is a trademark genericized from the original manufacturer of this type of square, the Swanson Tool Company.[1][2]
- ^ "Trademark Status & Document Retrieval". United States Patent and Trademark Office. May 19, 2017. Retrieved 2021-05-01.
Mark: SPEED SQUARE [...] Goods and Services [...] For: Hand tools, namely, squares [...] Owner name: Swanson Tool Company, Inc.
- ^ "Trademark Status & Document Retrieval". United States Patent and Trademark Office. May 19, 2017. Retrieved 2021-05-01.
Mark: SPEED [...] Goods and Services [...] For: HAND TOOLS, NAMELY; SQUARES [...] Owner name: SWANSON TOOL CO., INC.