1K70

Purpose

The 1K70 is a lightweight easy-to-apply handcuff, designed principally for arrest purposes, but having greater security than is usual for this type.

Features

Case assembly, shackles, swivels, chain-links and ratchet mechanism (latched on first notch) capable of withstanding a steady pull of 2200M, applied in any feasible manner for a period of 30 seconds, without detriment to security, and without preventing use. (NIJ requirement).

Cheek plates strong enough to resist the ‘spreading’ load resulting from a torque of 23Nm, applied to a forcing bit of 3.2 x 37.0mm cross-section, without loss of security. (NIJ requirement).

Automatic ratchet action to latch handcuffs in a restraining position the instant they are applied.

Additional deadlocking facility to improve security of locking and prevent further tightening.

3 lever, 4 lift locking mechanism (operated by key affording at least 25 usable differs) needed to remove deadlocking as well as release ratchet.

Small gap between ratchet arm and case to frustrate attempts to ‘pick’ the ratchet.

Two-piece locking pawls to further frustrate attempts to pick the ratchet.

Case fixing rivets partially counter-sunk to prevent heads being ground off by rubbing against an abrasive surface.

Guide on swinging arm to prevent it being bent or distorted away from the teeth on the ratchet.

Short connecting chain to inhibit arm movement and prevent access to pockets etc.

Round chain links to prevent possible breakage by inserting one link inside another and forcing.

Additional Features

Lockable range of wrist hole sizes, 155-225mm circumference (NOTE: NIJ requirement 165-200mm circumference) with a minimum fixed opening of 58mm to accommodate large wrists, even if covered by clothing, etc.

Swinging arm capable to turn through 360¡ (when no obstruction is in the way) to enable handcuffs to be carried in closed position for compactness and convenience, but ensuring that they are always ready for an arrest without having to use the key.

Deadlocking applied by means of thumb-slide on back of handcuff body – again it is not necessary to use the key except to unlock.

Lightweight (approximately 350gms) for ease of use and convenience in carrying them about.

Materials and finishes capable of withstanding exposure to a 5% salt spray for a period of 12 hours at 35 degrees C without detriment to security or performance. (NIJ requirement).

Materials and Finishes

Body castings - LM24 aluminium pressure die-casting, glass bead blasted and clear lacquered.
Ratchet Arm - Mild steel fine blank, nickel plated.
Deadlocking runner - Mazak 3 pressure die-casting, nickel plated.
Levers - Hard brass (natural finish); phosphor bronze springs.
Ratchet Pawl - Mild steel, case-hardened 600-700 VPN to a depth of 0.05-0.125.
Stainless steel spring.
Chain Links, swivels and pins - Mild steel, nickel plated.
Ratchet Arm Spacer - Mild steel, zinc plated.
Keys - high tensile brass stampings.
Rivets : Ratchet pivot - steel, Others - Aluminium.

Performance

The handcuffs were submitted to a nominated American Testing Laboratory for evaluation against NIJ 0307.01 March 1982. Testing took place 2nd August 1989. The samples passed all strength and  salt spray conditions.