Miwa Lock

Master-keying system
Keyed-alike system
Grand-master-keying system
Multi-master-keying system
Common keying system
Construction keying system
Double construction keying system
 
 

Available Keying Systems

Principles
1. As shown in Fig 1, without the key inserted, the locking bar is pushed by a spring into a groove on the cylinder body. Also, the tumblers are pushed by tymbler springs, In this condition, the cylinder plug is impeded by the tumblers ( because the tumbler notch is not above the locking bar); therefore, it is impossible for the locking bar to rise, and it is impossible to turn the cylinder.2. When a standard change key is inserted, the tumblers are pushed in by the key cuts and rotation occurs until the notch lines up with the top of the locking bar. In this condition, the taper of the groove and locking bar works against the spring, and the locking bar is pushed up, making it possible to turn the cylinder plug.

A two way rotary tumbler cylinder with high security
The PR Cylinder has a 2-way construction consisting of main and side tumbles whose contact surfaces are different, giving 100 billion possible key changes.
Enourmous number of key changes
Eleven tumblers in eleven chambers, whose main and side tumblers are positioned at four-level and two-level respectively, give the lock 100 billion possible key changes.
Superior durability
Like the U9 Cylinder, PR has extreme dust-proof and wear-resistance.
High security
The cylinder is extremely difficult to pick because the locking bar does not rotate until all tumblers are aligned at the same time and the anti-picking structure has a complicated shape. Also PR is highly resistant to drilling due to the use of extremely hard parts in the cylinder. 

Master-keying system
Grand master-keying system
Great grand-master-keying system
Multi-master-keying system
Common keying system
Keyed-alike system
Construction keying system
Display keying; emergency keying system
 
 
 
PR Cylinder for housing complex (two-way rotary cylinder, reversible key type)
 
Features

Available Keying Systems

1.   Locking bar stays in V groove of cylinder body and prevents rotation of plug when locked
2. Tumbler notches line up and give room for in-and-out movement of locking bar with change key insertion. Then locking bar is retracted by plug rotation according to slope-contacts between locking bar and cylinder body

Principles

Good for large and Complicated keying
With Nine tumblers positioned four-deep in nine double-sided chambers. this lock boasts 150,994,994 possible key changes
Superior Durability
Cylinder life is extended by the use of phosphor bronze. which is extremely wear-resistan
High Security
In additon to having ultrasfe rotary tumblers the U9 features nine four-deep tumbles making it extremely difficult to pick. 

    
 
U9 Cylinder (rotary cylinder)
 
Features