Posted tagged ‘carriage bolts’

Door Size Up #9


Here is door size up number 9, Thanks to B. Lynch for putting this one together.

This door is found on the backside of an old single story convenience store.  The store has since been renovated and is now used as a Korean beauty supply shop.  We’ll give you a little information why this size up is unique.  The first is the issue of adequate space on the exterior of the building.  The store backs up to a strip mall and a bar.  There is a wooden fence and gate that is padlocked that accesses the rear of the beauty shop and bar.  There is approximately four feet of space between both buildings hence the exterior pictures had to be taken at an angle.  Run down our key size-up points and see what you think.

We gave you the construction and occupancy but what else do we see?

  1. Metal Frame and metal jamb
  2. Metal door
  3. Primary lock is key in knob with a latch guard
  4. Secondary lock is a commercial deadbolt
  5. The carriage bolt pattern suggests an additional locking device has been added.  The likelihood is small that this is a drop bar because of the unusual pattern of the carriage bolts.  However, in our haste to access this door we may mistake this for a drop bar.  Another note about the carriage bolts is the size of the washers behind them.  This will add difficulty in driving the carriage bolts through the door should we choose to employ that tactic.
  6. We also see slide bolt patterns in the door in three different places.  On the hinge side directly below the top hinge and on the jamb side about a foot below the deadbolt and about three feet above the key in knob lock.

 The only real unknown we see is the unusual pattern of the carriage bolts on the exterior of the door.  Like we said before this could indicate the presence of a traditional drop bar with the two vertical bolts securing a bracket and the other bracket either welded to the door or the frame.  This doesn’t account for the carriage bolt mounted dead center of the door.  Taking a look at the back of the door reveals what we are up against.  As suspected we have a key in knob lock, deadbolt, and three separate slide bolts.  The unusual carriage bolt pattern on the front of the door is a modified drop bar.  The circular pattern on the door reveals how it functions.  The arm swivels and rests in the bracket.  It sits against the frame in an “L” shape and prevents the door from being opened.  

At first glance this door appears to be a formidable task.  Taking a closer look at the locking mechanisms reveals several things.  The slide bolts mounted near the top of the door do not match up with the holes drilled in the frame.  In other words they are not functioning locks.  The bottom slide bolt throws less than 2” into the frame and is held on by only two small screws.  This slide bolt will fail very easily with a little leverage applied via the Irons.  The latch guard, key in the knob, and deadbolt will be fairly easily and quickly defeated by the irons with basic techniques. If the slide bolt is not defeated by way of the conventional techniques on the jamb, we have numerous ways of defeating the carriage bolts either by irons or the saw.  The swiveling drop bar may be defeated be either attacking the lone carriage bolt in the center of the door or attacking the two vertical bolts next to the key in knob lock.  Either way this door will be defeated with by tried and true techniques and the Irons.

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