Mortise cylinders have always been at the foundation of Medeco's product line. In fact, 10 Series mortise cylinders were the first to roll off the assembly line when Medeco opened its doors and started production in 1968. Although the overall mortise cylinder design has seen very little change...
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Mortise cylinders have always been at the foundation of Medeco's product line. In fact, 10 Series mortise cylinders were the first to roll off the assembly line when Medeco opened its doors and started production in 1968. Although the overall mortise cylinder design has seen very little change over the years, the new Medeco3 design incorporates a new servicing procedure that is not present in the Medeco Original or Medeco Biaxial cylinder designs.
In this article we will look at servicing and pinning a Medeco3 mortise cylinder. We will also take a look back at some of the changes made to the Medeco mortise cylinder since its original design.
In the Beginning….
Originally, Medeco offered three lengths of mortise cylinders: 1", 1 1/8", and 1 ¼". Figures 1 and 2 show a 1970 cut-sheet from Medeco's original catalog on rim and mortise cylinders.
The original Medeco mortise cylinder design incorporated a solid, stainless steel pin chamber cover that had to be staked into place in order to contain the pins within the shell and plug. The solid pin chamber cover design was changed in 1977 to individually capped Allen set screws. This change helped to make the pinning and servicing of Medeco mortise cylinders more"locksmith friendly." This changed also made the cylinder more secure and less susceptible to sophisticated cylinder attacks such as the comb attack.
The face of Medeco mortise cylinders has also seen changes over its 35-year life. The name Medeco went from all uppercase letters to lowercase letters and now includes the UL product series designation for that type of cylinder. A logo that identifies the cylinder technology being used within the cylinder has also been added.
With the introduction of Medeco Biaxial in 1986, the only major change to the mortise cylinder design was the location of the locator tab slots located on the top of the shell and plug. In Medeco Biaxial product, the locator tab slots point to the right of the shell (looking down at the top of the cylinder) instead of toward the back of the shell as in original product.
Medeco3 Mortise Cylinders
Medeco3 mortise cylinders incorporate the same level of drill protection offered by Medeco Original and Medeco Biaxial mortise cylinders. This includes two hardened steel crescents located in the face of the shell at the 12 o'clock and 3 o'clock positions, hardened steel rods in the plug face at the 12 o'clock and 3 o'clock position and a hardened steel ball bearing located in the face of the sidebar.
The Medeco3 cylinder design is different than its predecessor in the fact that it includes a third locking point in the form of a slider mechanism. This slider mechanism blocks the sidebar from making contact with the bottom pins until a key with the proper side bitting is inserted into the cylinder.
Medeco3 mortise cylinders meet and exceed ANSI/BHMA A156.5-2001, Auxiliary Locks & Associated Products Grade 1 Listing. Medeco3 mortise cylinders also meet ANSI/BHMA A156.30-2003, High Security Cylinders standards (M1AAAM).
The Medeco3 mortise cylinder can quickly and easily be disassembled in the field. However, disassembly is not required when re-keying since the pins can be loaded through the top of the cylinder. These procedures should only be used for cylinder cleaning and component servicing (wear/damage/slider replacement).
Servicing Tools Required:
· Medeco screwdriver or Phillips head screwdriver
· Small flat blade screwdriver
· Cut key, key blank, or probe (pick)
Step 1. Remove Cam Screws, Cam Washer, and Cam. Medeco mortise cylinders are equipped with a changeable cam that can be changed quickly and easily in the field to meet the requirements of the application. Before the plug can be removed, the cam screws, the cam washer, and the cam must be removed from the back of the cylinder.
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