#safety hooks

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Simple History of Access Control System

Nowadays, the access control system is everywhere.  The development of the system is clearly changed with the improvement of the technology.  The idea of access control is to enable an authority for accessing to the object areas.  The basic mode of the system is physically controlled.  It is usually controlled by people who can allow the passing by payment, identification or tickets.  Some of the places have signs build up by ropes and safety hooks, and you will be allowed to get in to the place after the doorman checked your identification.  This is widely used at bars to keeps away from teenagers, or sometimes private parties to prevent some strangers to get in. 

With the improving technology, the ways of access control are getting more convenient as long as you have installed an access control system.  There are some essential components in the system, for example, the control point can be a door, gate or some granting-made barriers.  When you set the control point at the door, you might need digital card readers to takeover the permission jobs from human beings.  Some of the highly technique companies or buildings will use special ways to give the authorization, such as eye-ball scanning, fingerprint or palm prints permissions.  But before we enjoy the convenience of the access control system, we have to do some pre-works like data collections.  As long as you get enough information can your system recognize the incomers and give permission properly.

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How to Make a Climbing Hook

Building an effective grappling hook for use in climbing is easy with the right tools. Welding a steel rod together into a grappling hook will result in a tool that can be thrown over an obstacle, get caught on a fixed surface and allow the user to climb the attached rope to overcome the obstacle. This tool should only be used by trained climbers with the appropriate safety equipment to prevent injury.

Things You'll Need

1/2-inch thick steel rod

Hacksaw

Anvil

5-pound sledge hammer

Steel wool

Arc welder and rod

Welding face mask

  Instructions

1.          Cut your steel rod into five sections using a hacksaw. One should measure about 20 inches and the other four cut to about 16 inches each.

2.          Curl one end of the 20-inch long rod around the horn of your anvil by holding the opposite end with one hand and tapping the other end around the pointed horn with a 5-pound sledge hammer. The end of the rod should be curled around until the end touches the shaft of the rod. This loop will be used to attach a rope to later.

3.          Bend the four 16-inch rods into U-shaped sections to form the four safety hooks of your grappling hook. Hammering them around the horn of the anvil to create the necessary bend. Clean all surfaces you plan to weld using some coarse steel wool to make welding easier.

4.          Weld the one U-shaped 16-inch long rod to the 20-inch long rod opposite the end with the loop. Hold one side of a U-shaped rod against the shaft of the straight 20-inch rod end. Weld a bead along all adjoining surfaces with the tip of the arc welding rod. Ensure your arc welder is powered and the rod is firmly placed in the stinger. Weld a bead on either side of the U shaped rod to the shaft of the 20-inch rod.

5.          Attach the other three U-shaped rods to the grappling hook. These should be attached in the same fashion as the first, but spaced evenly around the 20-inch rod end. Each U rod should be offset 90 degrees from the next.

6.          Feed a length of climbing rope through the loop and tie it securely using a bowline knot. Toss the climbing hooks over an obstacle before pulling and adding tension to your rope. The theory is to have one of the four barbs catch on to a fixed surface of your obstacle, allowing you to then climb the taught rope.