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Combination Lock: a Five-Disc Drawer Lock (Boy Mechanic, 1915)
Popular Mechanics Co. · Public domain (published 1915)
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4. Novemba 2026NO
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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.
Kati
Unknown

Maagizo

1

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).

Vifaa kwa hatua hii:

Bamba la Shaba ya NjanoBamba la Shaba ya Njano1 discs
Metali isiyojulikanaMetali isiyojulikana1 driving pins

Zana zinazohitajika:

Bikari ya ncha mbiliBikari ya ncha mbili
Mkasi wa batiMkasi wa bati
Tupa ya chumaTupa ya chuma
Kekee cha mkonoKekee cha mkono
NyundoNyundo
2

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.

Vifaa kwa hatua hii:

Bati la chumaBati la chuma1 U-bracket F
Ufito wa chuma lainiUfito wa chuma laini1 pin G, rod N
Nyenzo isiyojulikanaNyenzo isiyojulikana5 rubber washers

Zana zinazohitajika:

Kekee cha mkonoKekee cha mkono
Kekee cha mkono chenye nchaKekee cha mkono chenye ncha
Mkasi wa batiMkasi wa bati
3

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.

Vifaa kwa hatua hii:

Kipande cha mbao ngumuKipande cha mbao ngumu2 knob
Metali isiyojulikanaMetali isiyojulikana1 pointer, latch, keeper
Washa bapaWasha bapa1 kipande
KaratasiKaratasi1 dial
Bati la chumaBati la chuma1 U-piece
Parafujo za mbaoParafujo za mbao1 kipande

Zana zinazohitajika:

Bisibisi bapaBisibisi bapa
Mkasi wa batiMkasi wa bati

Vifaa

9

Zana Zinazohitajika

7

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