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Combination Lock: a Five-Disc Drawer Lock (Boy Mechanic, 1915)

작성자

Forge

4. 11월 2026

Combination Lock: a Five-Disc Drawer Lock (Boy Mechanic, 1915)

A keyless lock fitted inside a drawer front: five brass discs on a pin, turned by pins from a knob and dial outside. When the notches line up the latch drops; turning back raises it into its keeper. The combination is changed by moving the pins in the discs. Source: The Boy Mechanic, Book 2 (1915), p. 169. Picture: Figs. 1-2 of the book.

중급

Unknown

안내

Cut the five discs

Cut five discs of sheet brass about 1/16 in thick and 1 1/2 in across. Drill each for a driving pin 15/32 in from the centre and press the pin in. Notch discs C, D and E for the latch; shape disc B as a cam to lift the latch into its keeper; leave disc A plain with only its pin (Fig. 1).

이 단계의 재료:

황동판1 discs

알 수 없는 금속1 driving pins

필요한 도구:

디바이더(양각규)

판금 가위

금속용 줄

손 드릴

망치

Mount the discs

Inside the drawer front fit a U-shaped metal bracket F carrying a 1/4 in pin G. Thread the discs on it with rubber washers H to M between them so they don't turn too freely. Fix disc A tight on the end of a 1/4 in rod N that passes out through the front.

이 단계의 재료:

강판1 U-bracket F

연강 환봉1 pin G, rod N

알 수 없는 재료5 rubber washers

필요한 도구:

손 드릴

곡병 손드릴과 비트

판금 가위

Fit knob, dial and latch

Make the knob of two pieces of wood screwed together with a pointer between them, fit it on rod N with a washer against the drawer. Paste on a paper dial with division marks and numbers. Fit the latch T in a U-shaped metal piece U inside the drawer end so its heel rests on the disc edges, with its keeper above. To find the combination, open the drawer and turn the knob until each notch comes under the latch heel, noting the number under the pointer each time.

이 단계의 재료: