Hi, Wolfgang,
Hi,
special entrance ...
)
First, this is a lovely work.
I was interested to note that this lock appears to reflect the European practice for pin-tumbler lock cylinders to have the pins downmost. In "user" terms, that means that the key is inserted with the "bitting" (cut pattern) downmost, like so:
I have always felt that this convention was intended to carry forward the tradition found in older types of lock, where for various reasons they were usually mounted so the bit of the key was downmost, like so:
In contrast, in the U.S., the convention for pin-tumbler cylinders (as recommended by the lock manufacturers, and sometime enforced by the lock design) was for the pins to be uppermost (and thus the key was to be held "bitting uppermost" when inserted into the cylinder plug, like so:
The rationale usually cited for this was that, should a pin spring break or even just get seriously fatigued, gravity would hold the part of the pin in the stationary part of the cylinder (the "driver") down so the cylinder would continue to operate more-or-less properly. You can see the arrangement here, with the key not yet fully inserted (here the drivers are uppermost, in contact with the springs):
I note that in the ubiquitous "cylinder-in-knob" locks, they are usually manufactured with the cylinder oriented in the lock such that, when the lock is installed in a "right-hand" mounted door, the cylinder would be oriented in accordance with the convention I described. When the lock was installed in a "left-hand" door, the installer was expected to first remove the cylinder from the lock and reverse it. Sometimes a special tool was required to remove the cylinder (there are usually ways to fake it), but any tradesman installing locks was expected to have that.
But of course that nicety is rarely followed today. So we may find, in a motel with this kind of lock (rate today), in about half of the rooms the cylinder was "upside down".
In my younger days, when staying for a while in a motel room with a left-hand door, and noting that the cylinder was "upside down" (a great matter of irritation to me), I would remove the lock and "reverse" the cylinder. (Yes, I had the necessary instruments in my suitcase.)
A couple of years ago, when I bought a cylinder-in-knob lockset (to used its proper full name) from a Lowe's "DIY" store, I was pleased that the attendant in that department (yes, there was a human there) asked if the lock was by any chance to be mounted on a left-hand door (he no doubt realizing that the average customer would have no idea how to determine the "hand" of a door). I said yes, it would be. He then asked if I wanted him to reverse the cylinder. I said yes, and he did it smoothly.
It was a very gratifying experience.
Best regards,
Doug