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

创建者

Forge

4. 十一月 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.

中级

Unknown

说明

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).

此步骤所需材料：

黄铜板1 discs

未知金属1 driving pins

所需工具：

两脚规

铁皮剪

金属锉

手摇钻

锤子

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.

此步骤所需材料：

钢板1 U-bracket F

低碳钢圆棒1 pin G, rod N

未知材料5 rubber washers

所需工具：

手摇钻

手摇曲柄钻与钻头

铁皮剪

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.

此步骤所需材料：