What Makes a Combination Lock Work


They’re just about everywhere – from lockers
and luggage, to high-security safes. The oldest one was made around 2000 BCE. You most likely use one every day, but have
you ever wondered how it works inside? Let’s unlock the secrets of a combination
lock! A regular combination lock consists of twenty
components, internal and external. Because it’s meant to last forever without
repairs or replacements, almost all of them are usually made of stainless steel which
is coated to withstand corrosion. Getting inside the lock isn’t easy. Let me see. Success! So, what do we have here? The inner case of the lock is home to all
of the internal components, none of which are longer than two inches. This is the lever. It sits on a special support post right here. There’s also a disc shaft, around which
the combination disc and nylon spacers turn. The internal disc spring keeps the combination
discs under tension so that you can dial the combination. A typical combination lock also has three
cams. The front one is made of metal and the others
are made of plastic. Additionally inside the lock case are the
shackle collar and a latch that fits into the shackle notch. Speaking of the shackle, it’s this U shaped
metal bar that doesn’t come out unless you dial the right combination. It’s an external component of the lock,
as well as the outer case, the back cover, and the combination dial. How do all those details work together to
keep your belongings (and maybe secrets) safe? The main idea here is that the shackle has
two possible positions: when it’s down, the whole thing is locked. When it pops up, it’s unlocked. That’s possible thanks to the lever that can
rotate both clockwise and counterclockwise. There’s also a thin metal strip attached
to the lever right here. It causes tension, so the lever constantly
tries to move back to its original position. But it can’t make a full circle because the
little bump right here stops it. Another important player of team lock is the
latch on the lever. It has a spring that’s hiding inside the lever. When the shackle goes down, it pushes the
latch, which fits perfectly in a groove in the shackle. To unlock the lock, the shackle has to go
up again. As it’s moving, it makes the latch turn. The shackle is free to go, and the lever springs
back to where it started. No matter how much the shackle wants to leave
the lock completely, the shackle collar keeps it inside. It moves up and down with the shackle and
stops at the top, right here. One important rule of the lock is: the shackle
will only come out if the lever can rotate. This is possible thanks to the drive cams. There’s a shaft that’s molded into the lock’s
back plate where they’re placed together with washers between them and a spring at
the end. This spring is what keeps them together. Cam one is molded to the dial and only turns
when the dial turns. Cams two and three can move freely. Each cam has an indentation, and a tooth on
at least one side. When all three cams line up, the lever can
rotate, the shackle goes up, and the lock opens. Technically, there can be more than 3 cams:
four, five, or even ten. It would make the lock a real fortress. But because each extra cam means an extra
number in the combination, it would make opening the lock take way longer. So I guess it’s a good thing there are just
three of them in this lock here. If you’ve used a combination lock before,
you know how it goes. First, you make two full turns clockwise (all
the cams will be moving) to the first number, positioning the groove in the third cam in
the right spot. Then, you go counter-clockwise past the first
number to the second one. Now only the first cam is moving. When you pass the first number, the tooth
on the first cam catches the tooth on the second cam, and they start moving together,
eventually lining up the groove in the second cam with the third cam. Finally, you turn the dial clockwise to the
third number. Only the first cam is moving. When all three grooves are in one line, you
can open the lock. All three steps are important, so let’s see
how it all works with a combination. But first, I’ll rotate the dial three times
clockwise to clear the previous combination. Done! So, I chose the combination 11-29-17. Speaking of combinations and digits, have
you ever forgotten the one you dialed on your luggage lock? Share your funny stories in the comments below. Anyway, I’m moving the dial: 9, 10, 11. Okay, let’s see what’s going on inside the
lock. Cam three is in the right place now. I’ll go counterclockwise one full circle now. Cam one and cam two are in contact. Cam three isn’t moving. And I’m at 29. Cam two and cam three are now in line. And to set the final number, 17, I’ll rotate
the dial clockwise, and done! Now all three cams are aligned. The lever is moving, the shackle can slide
out, and voila, it’s unlocked! And if I push the shackle inside the lock
again, it’ll lock, and I’ll have to go through the rotating process again to unlock it. Now that you know how a combination lock works,
let’s take a quick peek at some more popular locking mechanisms! Padlock
Padlocks are easily the most basic type of door locks. A padlock can be a combination lock or use
a key. Like a combination lock, a padlock isn’t attached
to any surface but locks into itself. They come in different sizes and shapes, but
always have a U-shaped shackle. Because they don’t provide top level security
(technically, you can just cut through it if you really wanted to), you’d normally use
it on a shed or other storage room door. Cam lock This is another super simple lock you wouldn’t
want to use for a safe. The basic element in it is a cam that turns
when you insert a key to lock and unlock the mechanism. These locks can be flat or tubular and are
usually installed in mailboxes, lockers, or cabinets. Deadbolt lock Deadbolt locks are popular for external doors
because they’re reliable, easy to find, and good for their price. The locking mechanism has a cylinder that
goes directly through the door with a keyhole on the outside. When you insert and turn the key, it makes
the bolt inside the cylinder move into the door frame, locking the door. If there’s one cylinder, you only need a
key when unlocking the door from the outside. If there are two cylinders, you’ll need
a key even to get out of the house. A metal plate that’s inserted into the doorframe
keeps the mechanism stable. Barrel bolt A barrel bolt, or a sliding bolt, is only
used on the inside of the door. It’s definitely not the safest of locks, but
installing two of them on one door gives at least some protection. Its most important parts are the cylindrical
bolt that goes on the door and a socket on the door frame where the bolt slides in. Chain lock A chain lock is much like a barrel lock. The main part of it is on the door, and the
catch is on the door frame. The main difference between the two types
of bolts is that there’s no cylinder bolt in a chain lock, just a chain. Duh. It lets you open the door just a bit to see
who’s outside and decide if you want to let them in. Electronic lock You don’t need a physical key to unlock
an electronic lock, but a code you have to type on a keypad or a special card. It locks automatically, and sometimes you
can even unlock it remotely from your phone or laptop to let someone in if you’re away
from home. So there. As they say in the fairy tales: I hope you
have lots of luck with your locks, Goldilocks. Hey, if you learned something new today, then
give the video a like and share it with a friend! And here are some other cool videos I think
you’ll enjoy. Just click to the left or right, and stay
on the Bright Side of life!

100 Comments

  1. pedro gomez said:

    Hello Bright side!

    November 30, 2019
    Reply
  2. 5ive8ight said:

    Who’s been a HUGE Fan for BRIGHT SIDE before 2019?
    👇
    👇

    I’m gifting my next 69 loyal Subscribers🎁
    With Notis on

    November 30, 2019
    Reply
  3. Alyssia Trampelli said:

    I'm the first

    November 30, 2019
    Reply
  4. Baät said:

    Who is a true fan of bright side??
    💘
    👇🏼

    👇🏻ᶦᵐ ᵍᶦᶠᵗᶦⁿᵍ ᴍʏ ɴᴇxᴛ ⁶⁹ łòÿáł sᴜʙs 🎁 💞

    November 30, 2019
    Reply
  5. Riskyy said:

    Who’s been a HUGE fan of Bright before 2019??
    🤙🏽
    👇🏽

    👇ɪᴍ ɢɪғᴛɪɴɢ ᴍʏ ɴᴇxᴛ 69 loyal sᴜʙs🎁

    November 30, 2019
    Reply
  6. David Kozak said:

    Go check it out

    November 30, 2019
    Reply
  7. Denny Gamer said:

    Sisi Terang

    November 30, 2019
    Reply
  8. Dr0p Sh0ts said:

    I use p e n c i l

    November 30, 2019
    Reply
  9. shaurya gupta said:

    mr beast i am big fan

    November 30, 2019
    Reply
  10. KINGBPLAYS1 said:

    Who else loves Bright Side💞
    👇

    I’m trying to hit 2k subs🤩

    November 30, 2019
    Reply
  11. AlienZGamer said:

    Who’s been a HUGE Fan for BRIGHT SIDE before 2019?
    👍
    👇

    I’m gifting my next 70 loyal Subscribers🎁
    💞With Notifications

    November 30, 2019
    Reply
  12. Nikki Revell said:

    So bright side viewers im literally 12 away from my first 100

    I hope you guys check me out and support my channel please and thank you

    November 30, 2019
    Reply
  13. Noora Ahmed said:

    First

    November 30, 2019
    Reply
  14. Xlr8 said:

    Hey

    November 30, 2019
    Reply
  15. Arafa Chowdhury said:

    Aaaaaaaaaaaaa

    November 30, 2019
    Reply
  16. Hassan Mahone said:

    Who else Loves BRIGHT SIDE

    👇🏽

    I’m gifting my next 100 subs 😍

    November 30, 2019
    Reply
  17. Shon 2005 said:

    I love the Bright Side of life!!😊😊

    November 30, 2019
    Reply
  18. Just A Dio Who's A Hero For Fun said:

    This is where I keep the secret of Obama's last name

    November 30, 2019
    Reply
  19. PRO_squash677 said:

    Yo

    November 30, 2019
    Reply
  20. Skartel said:

    I use my first combination lock in the year 1999

    November 30, 2019
    Reply
  21. Atula Pongen said:

    Like this vidoe👍👌👏

    November 30, 2019
    Reply
  22. Sawyer Timblin said:

    Hi

    November 30, 2019
    Reply
  23. H Plays said:

    Hi

    November 30, 2019
    Reply
  24. Jacobfireboy4545 lol said:

    I'm here early

    November 30, 2019
    Reply
  25. Duchi said:

    "What Makes a Combination Lock Work"

    LockPickingLawyer: I'm something of a Lock expert myself"

    November 30, 2019
    Reply
  26. Bully K9Training said:

    Wow

    November 30, 2019
    Reply
  27. Science Mines said:

    It should be combination 🙂

    November 30, 2019
    Reply
  28. Marqz said:

    Hey guys i am doing a giveaway i promise

    November 30, 2019
    Reply
  29. Preety Mongia said:

    Best vids

    November 30, 2019
    Reply
  30. Abhinav Sharma said:

    India 🇮🇳

    November 30, 2019
    Reply
  31. DarkAssassinGrinder said:

    WOW!

    November 30, 2019
    Reply
  32. Pushpa Agarwal said:

    my name is piyush i watch your videos regular

    November 30, 2019
    Reply
  33. MLG DUDE said:

    Beast!?

    November 30, 2019
    Reply
  34. Dee Raghunath said:

    AndI Oop

    November 30, 2019
    Reply
  35. Discover With Omar said:

    Me

    November 30, 2019
    Reply
  36. MLG DUDE said:

    Who ate a tacocat today

    November 30, 2019
    Reply
  37. Please don't CHECK my YouTube channel said:

    Who loves Bright Side 👇👇

    Don't read my name

    November 30, 2019
    Reply
  38. Rezac Gamer Roblox said:

    Im not late right?

    November 30, 2019
    Reply
  39. Darrius Brown- Harper said:

    Yay I always want 2 know this

    November 30, 2019
    Reply
  40. Discover With Omar said:

    Who is a true fan of bright side before 2019?

    November 30, 2019
    Reply
  41. MCGODMASTER123 said:

    180 like 66 comment

    November 30, 2019
    Reply
  42. Jack said:

    Bright side: what does a combination lock work?
    Me:?
    Mumbo jumbo:I know the answer it is something I love and call REDSTONE

    November 30, 2019
    Reply
  43. DragonGamezYT said:

    I was wondering what was inside that thing. I couldn’t even open my locker that has a combination lock

    November 30, 2019
    Reply
  44. All News كل جديد said:

    Good 😍😍😘😘

    November 30, 2019
    Reply
  45. EditzSZN said:

    Who else Loves Brightside🤩

    I am gifiting my next 100 subscribers💗

    November 30, 2019
    Reply
  46. Savage Poet said:

    Combination Locks work to avoid Social Security Checks

    November 30, 2019
    Reply
  47. Crafty IMAGINATION said:

    Minecraft players : Let's just say only some keys connects the redstone and it opens

    November 30, 2019
    Reply
  48. TechsDaBomb said:

    Can we get to a 1000 likes In the comments?

    November 30, 2019
    Reply
  49. happy oberoi said:

    Please make a video on A world without fire 😀😀

    November 30, 2019
    Reply
  50. Joshua Navarro said:

    Too technical for me

    November 30, 2019
    Reply
  51. SHUBH X said:

    What if we nuked the sun?????

    November 30, 2019
    Reply
  52. Elaex Beauty said:

    Great video.❤

    November 30, 2019
    Reply
  53. Sharky Tuber said:

    BRIGHT SIDE I love you bright side

    November 30, 2019
    Reply
  54. ALL AROUND FACTS said:

    Late comer give a thumbs👍
    👇👇

    November 30, 2019
    Reply
  55. lanoshka syr said:

    James Charles kissed you like to undo

    |
    |
    |
    |
    V

    November 30, 2019
    Reply
  56. GAURAV KUMAR said:

    METAL IS THE ANSWER. 😂😂😂

    November 30, 2019
    Reply
  57. David Kozak said:

    Guys who knew locks were so complicated bright side makes awsome videos.

    November 30, 2019
    Reply
  58. Katherine said:

    Who knows 😅🤔

    November 30, 2019
    Reply
  59. potatomato :p said:

    When i was a kid i always wanted to rocket launcher all the locked doors in resident evil 2, 3, 4 and 1 remake.

    November 30, 2019
    Reply
  60. Zoylez said:

    Wʜᴏ Eʟsᴇ Lᴏᴠᴇs bright side

    ❥ɪ ᴀᴍ ɢɪғᴛɪɴɢ ᴍʏ ɴᴇxᴛ 80sᴜʙsᴄʀɪʙᴇʀs❥
    🖤 ᗯITᕼ ᑎOTIᖴIᑕᗩᑎTIOᑎՏ Oᑎ🖤

    November 30, 2019
    Reply
  61. Ismail Ali said:

    Wow it's really cool

    November 30, 2019
    Reply
  62. Justin Cairns said:

    Every body leave a like

    Like like like like like

    November 30, 2019
    Reply
  63. Buffboy Awer said:

    He probably won't make a video of hacking these locks, else it'll turn his reputation from BRIGHT SIDE to DARK SIDE… Or maybe DarkSeid

    November 30, 2019
    Reply
  64. NANDANA K A said:

    "Legends say I'm still searching for my lost key 🗝 "

    November 30, 2019
    Reply
  65. Sapphire Vlogs said:

    OUT OF ALL THESE COMMENTS YOU FOUND MINE

    HERE'S A COOKIE🍪

    November 30, 2019
    Reply
  66. Poke Gangstar Hindi said:

    make a video on
    what will happen if the moon disappears for just 5 mins or a day
    or even more.

    November 30, 2019
    Reply
  67. Fun bun aj said:

    AHAHHHSHAHH I'm evil their was 100 comments now their is101! 😂😂😛

    November 30, 2019
    Reply
  68. Anurag said:

    Who has been a huge fan of "BRIGHT SIDE" before 2019?😍
    ♥️
    👇 I'm gifting my next 95 loyal subs🎁

    November 30, 2019
    Reply
  69. Kody Littleton said:

    Good to know

    November 30, 2019
    Reply
  70. Hussain Virk said:

    I use that at school

    November 30, 2019
    Reply
  71. Laksh Sarda said:

    Those who love Pewdiepie more than Bright side comment ‘P’ or else if you love bright side more than Pewdiepie like my comment

    November 30, 2019
    Reply
  72. Anjali Saji said:

    Your videos are interesting and worth watching….Keep making more videos:-)

    November 30, 2019
    Reply
  73. ARandomPiscesChild said:

    Idk what to say so hi

    November 30, 2019
    Reply
  74. Aurobindo Ghosh said:

    is this a basic lesson in encryption for dummies?

    November 30, 2019
    Reply
  75. Rukhsana Yasmeen said:

    like or i will

    do nothing : )

    November 30, 2019
    Reply
  76. kurt elbrecht said:

    You

    November 30, 2019
    Reply
  77. Louden Rangel said:

    hola

    November 30, 2019
    Reply
  78. MEDICAL hub said:

    I am your huge fan
    World's most amazing channel

    November 30, 2019
    Reply
  79. Neon Caterpillar said:

    He protecc, He atacc,
    But most importantly

    He always let his own people come in

    November 30, 2019
    Reply
  80. Toni Slavov said:

    Who else thinks Locks are out of date ?

    November 30, 2019
    Reply
  81. Game Masters said:

    If you need to rotate it three times to scramble it, then how do auto scramble locks work?

    November 30, 2019
    Reply
  82. Sadie Grace said:

    In the fifth grade I couldn’t figure out how to open my locker. Does that count as funny lock story?

    November 30, 2019
    Reply
  83. Viral Videos said:

    Don't lie who's watching while reading comments?
    I hope most of you'll don't ignore this but I started a YouTube while ago any support will be appreciated

    November 30, 2019
    Reply
  84. Fares Elkady said:

    Play the bright side intro on 2x speed it's hilarious

    November 30, 2019
    Reply
  85. Loso Damainman said:

    Ran out of vids to post?

    November 30, 2019
    Reply
  86. Ankush Kumar said:

    Ight imma try some bruteforcing

    November 30, 2019
    Reply
  87. mariam othman said:

    hii
    im late

    November 30, 2019
    Reply
  88. 1000 subs without any video challenge in 3 months said:

    Bright side: Do you know how a combination lock work?

    Me: Hmmmm!

    Bright side: Okay!

    November 30, 2019
    Reply
  89. Cadillac Deville said:

    🤔🤔2 shakes and it opened 😂?

    November 30, 2019
    Reply
  90. Chuckles the Jester said:

    Sounds like the nariator from “how it’s made”

    November 30, 2019
    Reply
  91. Kirk Tinoy said:

    My brain

    November 30, 2019
    Reply
  92. KingMayar said:

    Watch me live now playing with viewers creative

    November 30, 2019
    Reply
  93. Yoga With Claudia Yoga Chandra: Clases Yoga Español said:

    😊👍🏼👍🏼

    November 30, 2019
    Reply
  94. Ann Lewis said:

    So I had a friend we recently split I need some advice on what to do next because she was my only friend in the same school may not be the right place but why not ask

    November 30, 2019
    Reply
  95. Mr. PianistMusician said:

    My WHAT IF question : What if earth didn't have seas and oceans?

    November 30, 2019
    Reply
  96. Agnes Malik said:

    Hey, I just wanna tell u there is YouTube channel called " sisi terang " that had similar videos like yours. Pls check that out, are they stole it from u or u guys collaborating?

    November 30, 2019
    Reply
  97. Mark Hyatt said:

    cool

    November 30, 2019
    Reply
  98. Namjoonie_ Army134 said:

    .

    Periodt

    November 30, 2019
    Reply
  99. SBJ CREATORS said:

    nice sharing

    November 30, 2019
    Reply
  100. Alora Russell said:

    I know how keys unlock doors

    November 30, 2019
    Reply

Leave a Reply

Your email address will not be published. Required fields are marked *