Abstract: A ratchet screw driver includes a handle having a tube and having a number of ratchet teeth and a driving stem rotatably engaged in the tube. A follower is slidably engaged on the driving stem and includes a number of ratchet teeth for engaging with the ratchet teeth of the handle. A spring may bias the ratchet teeth of the follower to engage with the ratchet teeth of the handle for allowing the driving stem to be rotated in an active direction by the handle and to be rotated freely relative to the handle when the handle is rotated in the reverse direction.

Abstract: A hand tool which includes a handle holding a sleeve on the inside, a shaft moved in and out of the sleeve, a coupling member pivoted to the shaft and turned between a first position where the coupling member and the shaft are axially aligned, and a second position where the coupling member and the shaft are retained at right angles, and a control device coupled to the coupling member and shifted between a first position for forward/backward driving, a second position for forward driving only, and a third position for backward driving only.

Abstract: A ratchet screw driver includes a follower secured in a handle and having two ends each having a number of ratchet teeth. A barrel is engaged in the follower and has two non-circular ends for slidably engaging with two rings. The rings have ratchet teeth arranged opposite to each other for being biased to engage with that of the follower. The barrel may be rotated by the handle when the handle is rotated in an active direction, and the rings may be forced away from the follower against the biasing springs when the handle is rotated in a reverse direction.

Abstract: A length-adjustable screwdriver including a handle having a polygonal center hole, a polygonal tube slidably mounted in the polygonal center hole of the handle, a collar block controlled by a chuck to lock the polygonal tube at the desired location, a shaft mounted in the polygonal tube and having a magnet at its front end adapted for securing a tool bit at the front end of the polygonal tube by magnetic attraction, and a sleeve slidably sleeved onto the polygonal tube, the sleeve having a spring-supported ball forced into engagement with one of a longitudinal series of locating holes of the polygonal tube to secure the sleeve at the desired location and a polygonal center through hole adapted for holding a tool bit when the front end of the sleeve protrudes over the front end of the polygonal tube.

Abstract: A tool handle assembly includes a barrel having a bore and a cap having a hole. An element has a front tube for engaging through the bore of the barrel and has a rear protrusion for engaging in the hole of the cap. The tube includes an annular rib for engaging with and for rotatably supporting the barrel on the tube, and for allowing the barrel and the element and the cap to be assembled together without additional tool. The element includes a curved upper and bottom portions for allowing the user to grasp comfortably.

Abstract: A ratchet screw driver includes a driving stem having a gear rotatably engaged in the bore of a handle and having a free end end for engaging with a fastener to be driven. A ratchet mechanism is engaged in the handle and engaged with the gear of the driving stem for selectively driving the driving stem. A barrel is rotatably engaged on the driving stem and movable along the driving stem for engaging around the fastener and for preventing the fastener from being tilted and for preventing the fastener from hurting the hand of the user.

Abstract: A ratchet screw driver includes two rings secured in a handle and each having a number of ratchet teeth opposite to each other. A barrel is rotatably engaged in the rings. Two followers are slidably engaged on the barrel and rotated in concert with the barrel and each includes a number of ratchet teeth for engaging with that of the rings. A spring may bias the followers toward the rings. An extension is engaged with the barrel and may be rotated in an active direction by the handle. The followers are forced toward each other when the handle is rotated in a reverse direction.

Abstract: A ratchet tool includes a housing having a bole for rotatably receiving a rod and having one or more grooves for receiving supporting members and having a curved slot formed around the hole for receiving two rollers. The curved slot includes narrower ends or center portion for allowing the rollers to engage with the rod and the housing for allowing the housing to rotate the rod. The rod may be driven to rotate in one direction when only one of the rollers is engaged with the rod and the housing. The ratchet tool may be used for screw drivers or for wrenches.

Abstract: A screw driver includes a handle having a casing for receiving batteries. A switch is electrically connected to the battery. A socket is engaged in the handle for receiving a lamp. A transparent block is engaged in the front end of the handle for engaging with a driving tool. A ferrule is rotatably engaged to the handle for engaging with and for retaining the transparent block in place. A reflector is engaged around the lamp and a spring may bias may bias the reflector away from the socket for adjusting the light beam of the lamp.

Abstract: A ratchet mechanism includes a block secured in a handle and having a bore for receiving a rod and having two channels for receiving two pawls. The block has two projections extended inward of a slot. A sleeve is secured on the rod and includes a gear for engaging with the pawls. A disc includes an extension for disengaging either of the pawls from the gear so as to control the active directions of the ratchet mechanism. An arm has two legs engaged with the disc and engaged in the slot and engaged with the projections so as to retain the disc relative to the block at three positions.

Abstract: A reversible screwdriver includes a handle, a screw cap and a socket respectively fastened to two opposite ends of the handle, a shaft fastened to a bottom center hole of the socket by a clamp, and a rotating knob mounted around the shaft for controlling the working direction of the shaft. The rotating knob includes a barrel mounted in a rectangular chamber inside the socket and has four longitudinal slots around the periphery and four round rods in the longitudinal slots for supporting the shaft, a hand wheel coupled to the barrel, a wire rod fastened to the barrel and moved by, the hand wheel relative to the triangular stop block of the socket to control the working direction of the shaft.

Abstract: A screwdriver including a handle, a driving block fastened to the handle at one end, a front cap enclosing and rotatably fastened to the driving block, and a transmission shaft having a ratchet wheel at one inserted into a hole on the driving block and a square tip at an opposite end extended out of the front cap for turning screws, and two stop blocks controlled by rotation of the front cap to simultaneously or alternatively engage the ratchet wheel thus permitting the transmission shaft to be turned by the driving block in both clockwise and counter-clockwise direction, or permitting it to be turned in only a clockwise or counter-clockwise direction.

Abstract: A hand tool assembly which includes a casing having a coupling portion at one end and a receptacle portion at an opposite end, a shank having a coupling rod at one end for fastening to the coupling portion of the casing and a socket at an opposite end for holding a tool bit for turning screws, and a cover detachably covered on the receptacle portion of the casing, the cover having two plug boards for fastening to the receptacle portion of the casing, and a plurality of tubular upright bit holders for keeping tool bits, the tubular upright bit holders defining a space for holding the socket of the shank for permitting the shank to be received inside the receptacle portion when the hand tool assembly is not in use.

Abstract: A reversible socket wrench including a handle having a box end, an adapter for mounting a socket for turning a workpiece, an adapter holder mounted within the box end and covered with a top cover plate to hold the adapter by roller bearings, a locating spring wire fastened to the adapter holder to hold it in position, and a slide moved in an arched slot on the top cover plate to shift the adapter holder between the forward operating position for allowing the adapter holder to be turned by the handle clockwise, and the backward operating position for allowing the adapter holder to be turned by the handle counter-clockwise.