The first point to make is that there is no standard in the way which locks turn in order to lock or unlock. So what makes the most sense? Start with the easiest. Turning the key in either direction opens the padlock in each of the locks I tested. But what it only one direction works? In this case, what is the most intuitive direction to turn it? I would argue counterclockwise (or anti-clockwise, as some prefer). Righty Tighty, Lefty Loosy" - The age old phrase to remember which was to rotate a screw to tighten or loosen it. The rationale being that you are "loosening" the bolt and then rotating to the left (the "left" rotation is in relation to the top) -- aka: counterclockwise. A simple turn hand turn mechanism is on my front door. When it is in a horizontal position, the door is locked. The mechanism can be seen as a representation of the position of the bolt. In this case, highlighted by the red line, the bolt follows the horizontal line made by the mechanism -- indicating it is locked.

To unlock the bolt, which way do you turn it? Because you're turning the bolt away from the opening. To lock you turn the bolt mechanism towards the door opening. A similar door sits in my basement. In this case a keyhole is on the deadbolt, with a turn lock on the knob itself.craftsman garage door opener settings The knob's turn mechanism works in the same way as described above. garage door sensors flashingThe position tells me what state the lock is in (horizontal = locked and vertical = unlocked, as described above). sliding closet doors in torontoTurning the mechanism "away" from the opening will unlock the knob.patio door repair tampa fl

But what about the keyhole? It always faces straight up. In fact, I can't get the key out of it unless it is straight up so how do I tell what state it is in? Although I can't tell the state, I can follow the same rule of turn "towards" the opening to verify that it is locked.used jeep wrangler 4 door for sale in nj Both of these doors open to the left. custom interior doors victoria bcWhat about doors that open to the right? Thankfully, I have a kitchen door too... Here we have both a deadbolt and a knob lock. Both in the locked position -- known by their horizontal position. So which way do we turn them to unlock the door? Counterclockwise would seem logical, because that is the direction all the other locks worked! Perhaps a little annoying, but they still fall inline with the mental model of what's happening above.

Turning the mechanism away from the door opening will unlock them, and turning the toward the opening will lock them. What I've presented here is my "mental model" of how the lock mechanism works. When I encounter a lock that I've not used before this is the model I use to address the operation of that lock. Others may have a different mental model; perhaps an "always counterclockwise" mental model in which a lock is always turned to the left -- no matter its relation to what is being unlocked. In this case, the user would be very annoyed with my kitchen door. Because there is simply no standard (and you don't have to follow standards, it's just nice when you do) we can't claim there is a correct mental model to have. But, naturally, I would argue that my mental is the more proper one. Most people would tend to argue their mental model is the more proper, too. Turning the mechanism away from the point you are locking means you know which is way is which. An arbitrary direction is always open to interpretation and potential confusion, while an action in relation to the object (the door opening) is a constant reference to base off of.

But that's my mental model. Your mental model may say otherwise... Since writing this answer I've naturally paid a little more attention to how I lock and unlock doors around my house. I've discovered a lock that works totally opposite of the rest. The screen door leading out of kitchen has a lock which turns counterclockwise to unlock and clockwise to lock. If you remember my description of my kitchen door above, you'll remember it is a right opening door and that the locks on it work in the opposite direction. In the case of the screen door turning the lock "away" from the opening locks it, and turning it "towards" the opening locks it. I can't use my mental model of how doors work on this! But I've realized that my "muscle memory" has kicked in and I instinctively remember how this particular door works (i.e., opposite of how I would normally expect it). As a result I don't have an issue with it... but I wouldn't be surprised if I did in the past.The cost to ship items varies by item, shipment and shipping option.

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