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Dial Spring Scale with Tare Screw: Fray & Pigg, 1881

John S. Fray and Horace Pigg (US Patent 243,539) · Public domain (expired patent)

작성자

Penny

12. 10월 2026

Dial Spring Scale with Tare Screw: Fray & Pigg, 1881

John S. Fray and Horace Pigg of Bridgeport, Connecticut, patented this weighing scale in 1881, US 243,539. A dish sits on the standard of a frame hung on two pairs of cross-arms, so it moves straight up and down. A coil spring on a right-angle lever carries the load, and a rack on the frame turns a pinion carrying the pointer round the dial. To take up the tare, a screw rod through the front of the case moves the lever's lower end. Because the spring hangs vertically from the lever's horizontal arm, the adjustment is more sensitive and the bearing surfaces fewer.

중급

Workshop process

안내

Case and frame

Make the upright case with removable front and top. Cast or otherwise form the frame with a standard that passes up through the top to the weighing dish, and pivot it on upper and lower cross-arms whose other ends pivot to the back of the case.

이 단계의 재료:

저울 케이스1 개

크로스 암이 있는 저울 프레임1 개

계량 접시1 개

필요한 도구:

드라이버 세트

Spring and lever

Pivot the right-angle lever at the back of the frame. Hang the coil spring from its horizontal arm and connect the spring's lower end to the frame by a screw, so the tension can be regulated.

이 단계의 재료:

직각 레버1 개

저울 코일 스프링1 개

필요한 도구:

드라이버 세트

Rack and dial

Journal the pinion in a bracket so its front end passes through the dial plate and carries the pointer. Pivot the rack bar to the frame and keep it in mesh with a light spring, so the frame's descent turns the pointer.

이 단계의 재료:

랙과 피니언1 개

저울 문자판과 지침1 개

필요한 도구:

드라이버 세트

정밀 핀셋 세트

Tare screw

Pass the tare rod horizontally through the front of the case into a threaded opening in the lever's lower end, so turning it sets the pointer to zero with the container on the dish.

이 단계의 재료: