How does a Door Handle work?

How does a Door Handle work?

To get in and out of most rooms in your home, you’ll need to use a door handle. No matter how it looks on the outside, most of them work the same on the inside. Let’s crack one open and take a look. Once these screws are out, both sides come right off. This round part is called the rosette. It’s covering the inside parts of the door handle. It is fixed in place which means it will not rotate with respect to the handle. The handle always wants to be in the horizontal position. The spring is actually a stiff metal wire wrapped around right here. The wire is bent to the two ends. When I twist the handle, right here, either up or down, the spring gets tighter. As soon as you let go the handle springs back into place. Imagine if you didn’t have the spring; your door handle would always flop to the downward position. The other side looks very similar. There’s also a spring wrapped around the middle. You’ll notice three metal bars sticking out right here. This one in the middle is called the spindle. And these two are the fasteners to part of the rosette. When I twist the handle, the spindle goes with it too. This part here, is called the latch. and the rest of this is called the latch assembly. If I push in the latch and then let go it springs right back into place. If we take a peek inside here you can see the spring that makes this work. I’m going to fade in pieces here one at a time. This is the transmission plate. When it gets pulled to the right, the latch also get’s pulled causing it to come in. These two pieces are called the cam drive units. If they are rotated in just the right way they will push the transmission plate. Notice how they can be rotated either way and they will still push on the transmission plate. Now what would cause the cam drive units to rotate? Remember the spindle from earlier? It fits right inside the cam drive units. There’s a cage that goes around all of these parts to hold them in place. Now, let’s put this all together. Rotate the handle which also rotate the spindle, the spindle then rotates the cam drive units which pushes on the transmission plate which then retracts the latch. Now that’s a chain reaction. This happens every time you open a door. So what happens if this door has a lock on it? After all, we don’t want your younger sibling barging in without an invite. When the lock is horizontal, we can still turn the handle. But when the lock is vertical, I can no longer turn it. Inside the spindle here there’s a hollow space for another metal piece to go through. This is called the driver. When we rotate this lock, the driver rotates with it. The magic happens at the other end. First off, let’s look at the inside of the rosette. This circular piece is fixed to it. The handle has an open slot, so it can still rotate. Here’s the pieces that make the lock work. There’s a piece that’s fixed to the driver. We’ll call this the fixed cam. Rotate the driver, and the fixed cam rotates too. This second cam is facing the other direction. We’ll call it, the sliding cam. Because of the extrusions on the top and bottom it doesn’t rotate but instead can slide back and forth. When the door is being locked the rotating cam will gently push the sliding cam. When the door is unlocked a spring will push it back into its original place. The whole reason the door locks is because of these two notches at the end of the sliding cam. In the locked position, they slide right into these grooves on the rosette. If you remember from earlier, the rosette does not move. Now our handle is locked. But if we unlock it, The sliding cam slides back and we can rotate the handle again. Well I hope you now have a “handle” on how this works. My name is Jared Owen, thanks for watching.

100 thoughts on “How does a Door Handle work?

  1. I had this weird thought when I was trying to sleep a few weeks ago. I wondered how door handles worked. I tried thinking for myself how they work but couldn’t quite do it. I couldn’t let go of this thought, I thought about it everyday. I tried thinking of different ways it could work but I came up with none, I couldn’t wrap my head around the concept of a door handle. It drove me sick. I couldn’t sleep anymore. Whenever I closed my eyes, all I saw was a door handle. It taunted me. Taunted me for not knowing how it worked. It ruined my life. I couldn’t do anything anymore, not even the simplest of task. I was slowly going insane, and I knew it. Doors became an obstacle in my everyday life, I no longer even saw the doors, only the door handles. And they were taunting me. I couldn’t take it anymore. I was on the verge of a break down.That’s why I came here, to finally get the answer. To get the key back to my sane life. And I can tell you, it saved my life. It really did. I don’t know what I would have done if it wasn’t for this video.

    I’m a recovering door handle addict, and this is my story.

  2. What would cause knobs to not turn even if it’s not locked or locked? I took my doorknob off , replaced with a keyed lock. Was playing with the old one and it wouldn’t turn. Are some latches incompatible with some door knobs? Although it turned once but never again?

  3. Hi Jared. Your videos are amazing! Is there any chance you'd share .stl versions of the models for stuff you make like this door handle? I have a 3D printer and it would be a lot of fun to try to print something like this out. Keep up the great content! 🙂

  4. Makes me wonder why one of the doors in my house only opens when you turn the knob clockwise but not counterclockwise. Either the mechanics of the handle are different or I guess one of the notches on the cam drive units is broken

  5. Great video bro! Loved the 3d animations! This video was super professional. That joke at the end had me laughing lol haha

  6. Wow. That was amazing. So much information that we use every day without giving it a thought. Great narrator. Thank you 🙏

  7. I feel like he was waiting the whole video to make that final joke, and I loved it 😂 Great video man!

  8. Sat on the toilet looking at the door handle thinking “hmm, I wonder how that actually works”, five minutes later I know! And that’s why I love YouTube. Thanks, Jared.

  9. So I got locked into my own room because something broke in my doorknob causing it to stay locked, because of this video I was able to disassemble the doorknob and remove it’s insides. This was very helpful. Thank you!

  10. Hey, I am working in ironmongery industry for the past couple of months, Now you 've clarified a few of my doubts. U 've done a great job. Keep on updating videos like this.

  11. L


  12. Great video, detailed explanation, and nice animation.

    But, what about spherical handle that have a push button lock? Is the lock has the same mechanism?

    Thank you

  13. I really like your animations. I think you have struck the perfect balance between looking good and not spending a million dollars. Keep up the good work.

  14. great explanation, but i still have some questions:
    – is this the most common manner such doors work?

    – what causes the "snap" haptic feedback when you turn the lock to the locked position?
    – if there is a key for the outside, how does that lock and key mechanism interact/integrate with this mechanism?

    appreciate any reply!

  15. In the house i live in most of the inside doors' locking thing is a circle that pushes in
    and it comes back out with a spring (i think) to its original position once i turn the door handle

  16. Hey man great work ..nice video …I am also interested in this type of work…can you suggest me any software in which you make these animation ?? Would be helpful for me …. please !!!!

  17. This is what an actual and best use of animations for the cause of learning process. Keep it Up man…..
    Regards to You from INDIA.

  18. This is the type of video you tube was created for, not all the other stuff out there, plain pure and simple. Gold

  19. I have installed countless door knobs/handles in my adult life, but I learned a a lot from this video. Thanks…

  20. Wonderful video. Well crafted and explained. Helped me to 'see into' and understand a situation I had with my door: the connection between the transmission plate and the latch was broken, with the spring keeping the latch pushed out and the door 'locked'. Then, I just had to figure a way to push the latch back in to open the door. Now, to get a new assembly. Thanks!

  21. It's boring in the start, but I cannot believe I repaired my lock which not useful for 2 years. The lock is not exactly same but this gave me idea. Thank you!!

  22. I rarely comment or like any video but this One i couldn't resist myself commenting and liking. You deserve it. So much hard work done by you can be seen in this video

  23. outstanding. wish it had also explained how a pushbutton works to lock and unlock a door on an indoors privacy lock (the pushbutton locks a door like in your vid except you don't turn it, you push it.) Don't think there will be any other source on the Web that will be as clear as your vid would be.

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