Abstract: A stress-indicating rope-tightening apparatus includes a rope-tightening unit and a stress-indicating unit. The rope-tightening unit includes a rotational joint. The stress-indicating unit includes two strain gauges disposed on two opposite sides of the rotational joint for measuring the strain in the rotational joint, a calculator for calculating the stress in the rope based on the strain in the rotational joint and a display for showing the stress in the rope.

Abstract: A stress-indicating rope-tightening apparatus includes a rope-tightening unit and a stress-indicating unit. The rope-tightening unit includes a rotational joint. The stress-indicating unit includes two strain gauges disposed on two opposite sides of the rotational joint for measuring the strain in the rotational joint, a calculator for calculating the stress in the rope based on the strain in the rotational joint and a display for showing the stress in the rope.

Abstract: A capstan includes a frame, a reel for reeling a cable and a bolt for supporting the reel on the frame. The stress in the cable gets larger as the strain in the bolt gets larger. A driving device is operable to rotate the reel on the bolt. A strain gauge is attached to the bolt for measuring the strain in the bolt. A control box calculates the stress in the cable based on the strain in the bolt. A display shows the stress in the cable under the control of the control box.

Abstract: A hydraulic crimping tool with a pressure indicator includes a pump body having a first end connected to a handle and a second end connected to a head. The pump body includes a pressure switch disposed at a side, with the pressure switch having a lever mounted thereto. The head includes a second jaw and a first jaw, with the first jaw comprising a piston, and with the piston being actuated by the pump body. The hydraulic crimping tool also includes a lower die disposed on the piston and an upper die disposed on the second jaw. The head also includes an indicator mounted thereto for displaying a pressure reading. The indicator includes a panel disposed at a side of the head and a strain gauge mounted to the second jaw. The strain gauge is electrically connected to the panel.

Abstract: A hand operated cable dragging machine includes a frame having a hook and a check pawl on one end, a tongue and a guide tube on the other end a cover with a crest on bottom and a capstan, a ratchet and a Y-shaped handle coaxially and rotatably secured in the middle portion of the frame. A check pawl in the frame to prevent the ratchet from turning backward. A pawl member in the Y-shaped handle to operated the ratchet and the capstan. An adjustable device above the pawl member for controlling the engagement condition of the pawl member with the ratchet. It is characterized that this hand operated cable dragging machine can be able to serve any sized cable and the length of the cable is not limitative so as capable of dragging the heavy object at along distance.

Abstract: A handle for a hand power puller includes a transparent handle having a first chamber and a second chamber, a tubular adapter engaged into the first chamber and releasably connected the handle with a tubular projection of a fork like operator of the hand power puller, a miniature flash light removably engaged into the second chamber with a sealing engaged therebetween and a rubber cap secured to the rear end of the flash light. So that the handle is waterproof and the flash light facilitates the hand power puller can be worked in darkness or in the rain.

Abstract: A handle for a hand power puller includes a transparent handle having a first chamber and a second chamber, a tubular adapter engaged into the first chamber and releasably connected the handle with a tubular projection of a fork like operator of the hand power puller, a miniature flash light removably engaged into the second chamber with a sealing engaged therebetween and a rubber cap secured to the rear end of the flash light. So that the handle is waterproof and the flash light facilitates the hand power puller can be worked in darkness or in the rain.