Common types and materials of safety hooks
(1) "8" shaped safety hook. The opening and closing mechanism is a spring tongue automatic reset type, and a self-locking bolt composed of a safety pin, a compression spring and a pull pin is installed on the lock arm. When opening the hook, lift the spanner with your fingers to disengage the safety pin, and press the lock arm down to open the lock arm. If the lock arm is released, the lock arm will automatically reset under the elastic force of the reset spring, while the self-locking latch closes the hook mouth through the outward elastic force of the opening and closing mechanism, and the compression spring pushes the safety pin tightly, locking the lock arm. .
(2) The "D"-shaped safety hook is composed of two parts: the hook body and the lock arm. The opening and closing mechanism is a spring tongue automatic reset type. The lock arm part has two safety structure designs: twist self-locking and threaded hand lock. The arm is equipped with a rotating compression spring, the arm lock sleeve can be automatically reset and locked, the hand lock structure has threads on the lock arm, and the rotating lock arm sleeve can open and lock the safety hook.
The material of safety hook is usually divided into stainless steel, alloy steel or aluminum alloy. Steel hooks are hard and heavy, and are suitable for attaching anchor points or for contact with sharp metal equipment, such as safety harnesses and descenders. The breaking load of aluminum alloy shackles is not inferior to that of steel products. Aluminum safety hooks are relatively light in weight and are suitable for connecting various equipment of personal protective equipment and carrying multiple spares. However, aluminum alloys are less resistant to cutting, so avoid hooking with other sharp metals when using them.