Gutting a shipping container door lock, up to its bones

A shipping container door lock hardware might seem as just one piece, but you will be surprised at how complex it is.

Lockrods are mechanical devices used to secure swing doors, on the back end of trailers. They are used for semi-trucks, containers, and small specialty trailers.
A lockrod assembly consists of cams and keepers, a handle assembly, and hardware that attaches the lockrod to the doors. Lockrod cams are welded to the rod itself and become attached to the door. Keepers, the metal part that accepts the cam, are welded or bolted onto the end frame of the trailer and remain stationary to the end frame. Diagram showing all parts of a typical lockrod and its mounting hardware
Lockrods come in different lengths and thickness (rod diameter) depending on the intended use. Heavy-duty models are one-inch in diameter and are usually made of steel, most often galvanized, but sometimes painted or electropolished for cosmetic reasons.
Powerbrace invented the zero-torque lockrod concept that became an industry standard. The main benefit of the design is that the cam goes past the center point so that the more pressure that’s applied from the inside of the trailer doors (such as when animal weight is shifted against the door) the tighter the cams and keepers engage.
Refers to the ability of a lockrod cam to “reach” and engage the keeper (gather) while closing the door; this feature helps to overcome resistance from compression seals and warped doors.
A lockrod model with high door opening leverage, earning its name for its ability to open doors that are frozen shut.

Diagram of a Lockrod
Diagram showing all parts of a typical lockrod and its mounting hardware, courtesy of Wikipedia

Maybe someday you need to fix your lock system because it became defective, and it doesn’t open as smooth as it should, to find the right piece to replace you must first know its name, if not it will be extremely difficult. Here you have all the components of the old and new style, made by Buffers USA, Inc. you can download their catalog here

Hot Forging Process and Its Applications
Posted in Steel Forging

hot forging process
hot forging process courtesy of CFS Forge

According to the forging temperature, forging can be classified into
Most metal components intended to be forged are performed under hot
forging. Hot Forging is the most widely used forging process. In hot forging process, forging is carried out at a temperature above the recrystallization temperature of the metal which means at the temperature at which the new grains are formed in the metal. This kind of extreme heat is necessary for avoiding strain hardening of the metal during deformation.
In real conditions during industrial manufacturing, friction plays a part in the process. Friction forces at the die-work interface oppose the spreading of the material near the surfaces, while the material in the center can expand more easily. The result is to create a barrel shape to the part. This effect is called barreling in metal forging terms. Barreling is generally undesirable and can be controlled by the use of effective lubrication. Another consideration, during the hot forging manufacturing process, which usually acts to increase the barreling effect, is the heat transfer between the hot metal and the cooler die. The metal nearer to the die surfaces cool faster than the metal towards the center of the part. The cooler material is more resistant to deformation and expands less than the hotter material in the center, also causing a barreling effect.
The Advantages of Hot Forging are:
High strain rates and hence the easy flow of the metal.
Recrystallization and recovery are possible.
Forces required are less.
Disadvantages of Hot Forging are:

Lubrication at high temperatures is difficult.
Oxidation and scaling occur on the workpiece.
Poor surface finish.
Lesser precise tolerances.
Possible warping of the material during the cooling process.

cam & keepers

Container Locking Cam & Cam Keeper
Hot Forging Cam & Keeper courtesy of CFS Forge

Handles, Levers or Locking Bar

Intermodal Container Door Locking Bar
Intermodal Container Door Locking Bar Author Biswarup Ganguly