Abstract: A combination tool holder includes a holder body, at least one tool adapter and a bolt. The holder body defines therein a through hole including an enlarged-diameter segment, a reduced-diameter segment and a tapered segment. A stepped surface is formed between the enlarged-diameter segment and the reduced-diameter segment. The tool adapter defines therein a channel and has a combining end. The combining end has a conical surface configured to be received in the tapered segment. The bolt includes a screw and a nut. The nut is configured to abut against the stepped surface while the screw extends into the tapered segment to engage with the combining end. By screwing the bolt, the conical surface is driven to press against the tapered segment, making the through hole and the channel coaxial.

Abstract: A versatile folding ratchet tool comprises a ratchet assembly having two driving ends; and two tool assemblies connected to the two driving ends of the ratchet assembly, respectively; wherein each said tool assembly comprises a rotational core having one side connected to and driven by the driving end of the ratchet assembly; and two tool arms, each having one end thereof pivotably connected to the rotational core so that the tool arm is able to pivot with respect to the rotational core between a parallel position and a perpendicular position; and having an opposite end thereof pivotally attached by at least one tool element capable of pivoting with respect to the tool arm between a folded position and an extended position.

Abstract: The present invention discloses a quick removable chuck assembly and its cutting tool comprises a cutting tool with its positioning section passing through an axial hole of a main body; a sliding device being disposed on a wall of the main body and capable of moving back and forth horizontally along the axis of the main body; a device embedding groove being disposed at a positioning section of the cutting tool for embedding the sliding device; and a positioning sleeve being axially disposed outside the main body for controlling the sliding device to move back and forth by a rotary action; thereby the present invention can achieve the objectives of installing and removing the cutting tool in a quick and convenient manner.

Abstract: An anti-slip type electric drill chuck mainly includes a body which is obliquely provided with three pawls for clamping a drill head. The outer surface of one end of the three pawls is provided with a threaded surface for engaging a tapered threaded hole in a bearing nut, which has an outer end with teeth, an end portion provided with a ball ring. A check nut protective sleeve encloses the ball ring and bearing nut, and has elastic pointed portions engage the teeth. A drive annular block engages the inner wall of the bearing nut. A front housing sleeve engages the drive annular block and surrounds the aforesaid components. The front housing sleeve is rotated by hand to advance or retract the pawls to thereby loosen or tighten drill head. When the pawls clamp the drill head, the check nut protective sleeve stabilizes the bearing nut to prevent slippage thereof.

Abstract: An anti-slip type electric drill chuck mainly includes a body which is obliquely provided with three pawls for clamping a drill head. The outer surface of one end of the three pawls is provided with a threaded surface for engaging a tapered threaded hole in a bearing nut, which has an outer end with teeth, an end portion provided with a ball ring. A check nut protective sleeve encloses the ball ring and bearing nut, and has elastic pointed portions engage the teeth. A drive annular block engages the inner wall of the bearing nut. A front housing sleeve engages the drive annular block and surrounds the aforesaid components. The front housing sleeve is rotated by hand to advance or retract the pawls to thereby loosen or tighten drill head. When the pawls clamp the drill head, the check nut protective sleeve stabilizes the bearing nut to prevent slippage thereof.

Abstract: A cutter holder comprises a coupling shaft, a driving shaft inserted into the coupling shaft, the driving shaft having toothed rails respectively engaged into corresponding radial slots of the coupling shaft, a driving nut mounted on the coupling shaft and meshed with the toothed rails of the driving shaft for enabling the driving shaft to be moved axially upon rotary motion of the driving nut; a retainer ring mounted on the coupling shaft and disposed in contact with the driving nut at one side, the retainer ring having a plurality of spring leaves radially arranged around the periphery thereof, a driving ring mounted around the coupling shaft and press-fitted onto the driving nut, the driving ring having retaining grooves for the positioning of the spring leaves of the retainer ring, and a chuck fastened to one end of the coupling shaft and adapted to hold down a cutter.

Abstract: A power drill housing and chuck rotation indicator arrangement in which the power drill housing is formed of two symmetrical shells abutted against each other, the shells each having a front end terminating in a chuck guard defining a respective semi-circular mouth adapted to receive the chuck assembly of the power drill, keeping the chuck assembly protected within the chuck guards.

Abstract: A power hand drill includes a motor housing, a coupling block, a torque adjustment ring, and a chuck and driving shaft unit, the driving shaft of the chuck and driving shaft unit having a rear extension coupling rod inserted through the coupling block and coupled to the power output end of the motor in the motor housing, the coupling block having a mounting hole into which a holding down screw is threaded to force a steel ball into engagement with an annular groove around the periphery of the rear extension rod of the driving shaft to prohibit the driving shaft from axial movement relative to the coupling block.

Abstract: A combination wrench hammer set includes a handle rod having two upright sidewalls, a combination tool head pivoted to one end of the handle rod, the combination tool head having a hollow angular socket at one end and a hammer head-shaped adjusting screw threaded into the hollow angular socket, and a handgrip structure mounted in one end of the handle rod remote from the combination tool head, the handgrip structure including a handle cover pivoted to a middle part of the handle rod and adapted to keep tools and tool bits, and an end block fixedly fastened to the handle rod, the end block having at least one polygonal tool coupling hole for holding the selected tool bit for working.

Abstract: A power drill housing and chuck rotation indicator arrangement in which the power drill housing is formed of two symmetrical shells abutted against each other, the shells each having a front end terminating in a chuck guard defining a respective semi-circular mouth adapted to receive the chuck assembly of the power drill, keeping the chuck assembly protected within the chuck guards.

Abstract: A bit holding system includes a transmission block coupled to the transmission shaft of a power hand tool, a plurality of clamping rods obliquely radially mounted in respective oblong holes on the transmission block to hold a bit at a front end of the transmission block, the clamping rods each having a threaded rear end extended out of the transmission block, a first impact member having a tapered, threaded inside wall threaded onto the threaded rear ends of the clamping rods and a plurality of equiangularly spaced and backwardly extended bottom teeth, a spring supported second impact member mounted around the transmission block between the first impact member and the reversible motor drive, the second impact member having teeth acting with the teeth of the first impact member, and a shell for holding down by hand to stop the second impact member from rotary motion, causing it to impact a resisting force to the first impact member upon each rotation cycle of the first impact member when the first impact membe

Abstract: A wrench hammer set, comprising a handle rod, one end of said handle rod is linked to a combination tool head that serves as an adjustable wrench and a hammer; the other end of said handle rod is linked to a rod-shaped tool set; a handle cover covering the rear half of said handle rod, to serve as a handle of a hand tool set, inside said handle cover may be arranged an assortment of sleeve sockets; with said construction, tools of various functions are combined to become a hand tool, to fully achieve the purposes of minimized space and increased functions.

Abstract: A chuck for holding a tool a central axis, comprising: a main body, surrounding the central axis and having a periphery passed through by several oblique guiding openings, which are symmetrically arranged around the central axis; several jaws, gliding in the guiding openings and having a plurality of teeth; a threaded ring system, mounted on the main body, rotatable around the central axis, having an inner periphery with a thread, which engages with the teeth of the jaws, such that by turning the threaded ring system the jaws are driven towards the central axis or away therefrom; a holding ring for supporting the threaded ring system; a washer, mounted on the main body, for supporting the holding ring; and a front cover, covering the main body from the front end thereof, tightly linked to the holding ring and having an inner periphery with coupling elements, which engage with coupling elements on the threaded ring system, such that turning the front cover around the central axis drives a rotation of the threa

Abstract: A chuck unit installed in a power hand tool and controlled to hold down/release a bit, including a barrel, three clamping rods, a front cover shell, a rotary control device, a stop member, a rear cover shell, and a dust ring, wherein the rotary control device has a nut with embossed peripheral blocks for positive positioning in respective recessed locating holes in the front cover shell; the rotary control device is coupled to a stop flange outside the barrel and revolvably supported on the barrel by steel balls; the stop member is formed of two symmetrical halves and mounted on the front end of the barrel to stop the rotary control device from forward movement.

Abstract: A combination ratchet wrench includes a work end at one end of a handle, a ratchet wheel mounted in the work end, a stop block forced by a spring and a ball into engagement with the ratchet wheel to limit the turning direction of the ratchet wheel for permitting the ratchet wheel to be turned with the handle in one direction to fasten up or loosen a workpiece, wherein the work end has a recessed polygonal hole remote from the handle, the recessed polygonal hole having two angled lateral side walls, and two smoothly arched side walls respectively extended from the angled lateral sides toward the handle; the ratchet wheel has an eccentric coupling rod at one side; a crank pivoted to one side of the ratchet wheel and partially projecting into the recessed polygonal hole for stopping an inserted workpiece in the recessed polygonal hole for turning with the wrench, the crank having a constraint block at one end moved with the crank in the recessed polygonal hole for stopping the inserted workpiece in the recessed