SELF-LOCKING CORE CHUCK

Mechanical Specialties Core Chucks are unique in their simplicity of design and function with all of these features:

  • Self-locking in either direction of rotation without the necessity for mechanical change.
  • Straight faced to assure concentricity.
  • Self-adjusting to the web tension pull.
  • Immediate gripping - no slippage.
  • Reduced set-up time.
  • Steel or Aluminum.
  • One or three locking rollers.
  • Shoulder chucks have 1/8" raised shoulder from the chuck body which acts as a core stop and assures positive core alignment. We use a superior alloy that is impact resistant on shoulder chucks. If the operator hammers the end of the chuck, it won’t break or shatter the aluminum.
  • Shoulderless chucks have no shoulder which permits the core to slide completely over it. When combined with the shoulder type, it allows for sliding of the core on and off without having to remove either chuck from the machine shaft.
  • Chuck types are classified into series for easy identification and can be varied in size and shape to meet most operational requirements.
  • Chuck repair parts (locking rollers, step plates, springs) can be ordered by part number from the individual product pages.

All Chucks Feature:

  • Round bore sizes with +.010 tolerance unless specified.
  • Case hardened locking rollers.
  • Steel chucks and all steel components of aluminum chucks are black-oxide coated for rust retardation.
  • Aluminum chucks are provided with steel insert step plates and furnished with a Tap-Lok insert for maximum service.

Options at additional cost:

  • Square bores
  • Split hubs
  • Flange
  • Keyways (standard or special)
  • Extra set screws
  • Brass tipped set screws - For applications where the set screw markings on the shaft are the only objectional feature, we can furnish chucks with brass tipped set screws.
Self-locking Chuck Drawing 1
  1. Position of locking roller when core is turned counter clockwise during the take-up position.
Self-locking Chuck Drawing 2
  1. Position of locking roller when core is inserted or removed.
Self-locking Chuck Drawing 3
  1. Position of locking roller when core is turned clockwise during the unwind position.

The above drawings illustrate the patented self-locking principles of Mechanical Specialties' Chucks and Mandrels. The upward thrust of the rotatable toothed roller upon terraced steps results in positive, completely automatic locking action adjustable to the web tension pull. The ability of our chuck to lock in either direction permits the locking roller on the unwind chuck to self-adjust to the proper pull required to maintain the correct web tension when a correctional braking action is applied to the parent or unwind roll.

Watch a video demonstration of the self locking method and how it grips the cardboard core.