Schlage PRIMUS basics...
Posted: Sun Jan 03, 2010 8:36 pm
The Primus was invented by Bo Widen, the same person who is responsible for the picking nightmare that is the ASSA 6000. It's very similar in design to the Danish-made Ruko. This lock has a very high tolerance standard pin tumber set, and a 5 pin locking sidebar. The pins which allow retraction of the sidebar must be aligned vertically and rotationally. It's sort of a mini-medeco driverless cam lock in the tightest tolerance Schlage you have ever picked.
There are 6 possible depths for these sidebar pins, but that includes the fact that there are 3 rotational positions for the pins. Left, Center, and Right. Fore, center, and aft respectively. These 6 depths are actually only 2 depths for each pin angle. So a low or high cut is the extent of the vertical range, and for the left and right pins it is the same hieght. For center pins both are slightly higher. So there are 4 possible hieghts.
The pins:
Underside of the plug with the correct key inserted:
Sidebar removed to show a misalignment of unset pins:
Aligned with the proper key inserted:
The sidebar:
There are 6 possible depths for these sidebar pins, but that includes the fact that there are 3 rotational positions for the pins. Left, Center, and Right. Fore, center, and aft respectively. These 6 depths are actually only 2 depths for each pin angle. So a low or high cut is the extent of the vertical range, and for the left and right pins it is the same hieght. For center pins both are slightly higher. So there are 4 possible hieghts.
The pins:
Underside of the plug with the correct key inserted:
Sidebar removed to show a misalignment of unset pins:
Aligned with the proper key inserted:
The sidebar: