Abstract: A manual/auto dual-mode reversible measuring tape includes a tape marked with marks for measuring, the tape having a longitudinal series of tooth holes, a shaft coupled to the housing of the measuring tape by a slip joint, a gear fixedly mounted on the shaft and adapted to mesh with the tooth holes of the tape, a reversible direct current motor connected to a direct current power source and adapted to rotate the gear in moving the tape in and out of the housing of the measuring tape, a manual/auto control switch controlled to move the shaft between a first position where the gear is forced into engagement with the tooth holes of the tape for enabling the tape to be automatically moved in and out of the housing of the measuring tape upon rotation of the reversible direct current motor, and a second position where the gear is disengaged from the tooth holes of the tape for enabling the tape to be moved in and out of the housing of the measuring tape by hand, and switch means, which controls the connection of th

Abstract: A manual/auto dual-mode reversible measuring tape includes a tape marked with marks for measuring, the tape having a longitudinal series of tooth holes, a shaft coupled to the housing of the measuring tape by a slip joint, a gear fixedly mounted on the shaft and adapted to mesh with the tooth holes of the tape, a reversible direct current motor connected to a direct current power source and adapted to rotate the gear in moving the tape in and out of the housing of the measuring tape, a manual/auto control switch controlled to move the shaft between a first position where the gear is forced into engagement with the tooth holes of the tape for enabling the tape to be automatically moved in and out of the housing of the measuring tape upon rotation of the reversible direct current motor, and a second position where the gear is disengaged from the tooth holes of the tape for enabling the tape to be moved in and out of the housing of the measuring tape by hand, and switch means, which controls the connection of th

Abstract: Multisection wrench including a stem body and at least one jaw member or socket member connected with one end of the stem body for wrenching a screwed member. The stem body is composed of a predetermined number of identical connecting blocks which are longitudinally pivotally connected with each other. Each of opposite ends of two adjacent connecting blocks has at least one outward extending lug positioned side by side. A predetermined number of pivot pins are fitted in through holes of the side by side positioned lugs to pivotally connect the lugs, whereby the two adjacent connecting blocks are rotatable about the pivot pin to curve the stem body. The lateral sides of the side by side positioned lugs keep attaching to each other without departure. A predetermined number of resilient members are positioned between the contacting faces of the side by side positioned lugs to provide a resilient retaining force for the adjacent connecting blocks and achieve a locating effect.

Abstract: A direction control arrangement for wrench is constructed to include a body defining a box and a transverse through hole across the box, two stop elements respectively mounted in the transverse through hole at two opposite sides of the box, two steel balls respectively mounted in two distal ends of the transverse through hole, two spring members respectively mounted in the transverse through hole and connected between the stop elements and the steel balls to push the stop elements and the steel balls outwards in reversed directions, and a resilient retainer ring mounted on the body to stop the steel balls from escaping out of the body, the resilient retainer ring having two protruded receiving portions adapted to receive the steel balls alternatively for controlling te working direction of the wrench.

Abstract: A ratchet wrench stop member positioning arrangement having a stop member mounted in a transversely extended side hole in the body thereof and forced by a spring member into engagement with peripheral teeth of a ratchet wheel in a box in one end of the body, wherein the longitudinal central axis of the side hole defines with the horizontal line which passes through the center of the box a container angle at about 8˜18° so that the angle of action produced between the stop member and the ratchet wheel during the operation of the ratchet wrench is minimized, reducing the formation of inactive componenet of force.

Abstract: A crescent wrench having a screw hole at its handle in front of a thumbscrew, a holding-down screw threaded into the screw hole, and a handle couped to the holding-down screw and adapted for turning the holding-down screw between the operative position to hold down a movable jaw, which is to be turned by the thumbscrew relative to a fixed jaw at one end of the handle, and the non-operative position to release the movable jaw.

Abstract: A combination tool kit includes an elongated casing, a hexagon head socket holder mounted in the casing between front and rear ends of the casing and holding a set of hexagon head sockets adapted for turning bolts and nuts, a combination wrench pivoted to the front end of casing, the combination wrench having an open end and a box end at two distal ends thereof adapted for grasping and turning bolts and nuts, and a hexagonal spanner block pivoted to the rear end of casing, the hexagonal spanner block having a hexagonal box adapted to work with one of the hexagon head sockets stored in the hexagon head socket holder for turning bolts and nuts.

Abstract: An open-end wrench is provided with a mouth between two jaws and a nest interconnecting the two jaws, a first convex surface portion is provided on the first jaw driving surface; and a first transverse tooth, a second transverse tooth and a second convex surface portion is provided on the second jaw driving surface. The first transverse tooth, the second transverse tooth and the second convex surface portion of the second jaw are respectively arranged at predetermined distances from the first convex surface portion of the first jaw driving surface. Further, the distance between the first transverse tooth and the second transverse tooth is {fraction (3/25)} of the distance between the first convex surface portion of the first jaw driving surface and the first transverse tooth. This structural shaped and dimensional open-end wrench structural arrangement represents an improvement in grasping and turning new-type bolts and nuts as well as worn-out bolts and nuts.

Abstract: An angle-adjustable wrench includes a handle having a front end and two parallel lugs forwardly extended from the front end, a pivot connected between the lugs of the handle, and a wrench head turned about the pivot within 180° relative to the handle, wherein the wrench head has a retaining area and an adjustment area arranged in parallel and facing the front end of the handle between the lugs, and a stop member is coupled to the handle and moved along the front end of the handle between the lugs between a first position where the stop member is engaged with an arc-like, recessed, toothed portion thereof with the retaining area to lock the wrench head, and a second position where the stop member is disposed in contact with the adjustment area for enabling the wrench head to be turned about the pivot relative to the handle.

Abstract: A double-reversible ratchet wrench includes a wrench body defining a box, a ratchet wheel mounted in the box of the wrench body and adapted for turning a bolt or nut with the wrench body, a stop member mounted in the box end of the wrench body and shifted between two positions to control the direction of rotation of the ratchet wheel relative to the wrench body, the stop member having a smoothly arched, outwardly curved, toothed engagement face forced into engagement with the ratchet wheel to limit the direction of rotation of the ratchet wheel in the wrench body, a backward finger strip extended out of the box of the wrench body and adapted for operation by hand to turn the stop member in the box and to shift the engagement between one of two halves of the engagement face of the stop member with the ratchet wheel in controlling the steering direction of the ratchet wheel.

Abstract: A F-type socket wrench including a handle, a coupling block mounted in an opening of the handle, a steel ball stopped between a transverse back groove of the coupling block and a spring inside the handle, a tightening up screw threaded into an axial screw hole at the front end of the handle and having a rounded front end stopped against a transverse front groove of the coupling block, the coupling block having a square coupling rod for turning a wrench socket, the square coupling rod having a diagonal line between its two angles disposed in parallel to the longitudinal center line of the handle.

Abstract: A handle structure for a screwdriver, which includes a handle fixedly provided at one end of a blade, the handle having a longitudinal slot through two opposite sides of the periphery thereof, a pivot pin fixedly mounted in the handle across the longitudinal slot, and a handle plate turned about the pivot pin, the handle plate having a longitudinally extended, serrated slot coupled to the pivot pin for enabling the handle to be turned about the pivot pin and set between the non-operative position received in the longitudinal slot at the handle, and the operative position arranged perpendicular to the handle.

Abstract: A wrench, which includes a hollow three-way (or two-way) casing, a plurality of coupling shafts respectively mounted in the ends of the casing for holding a respective tool accessory, and a transmission mechanism coupled between the coupling shafts for enabling the coupling shafts to be rotated synchronously, wherein the transmission mechanism includes a plurality of transmission members respectively coupled to the coupling shafts inside the casing and meshed with one another, and a plurality of compression springs respectively mounted in the coupling shafts to force the transmission members into engagement with one another, the transmission members each having a rectangular shank at one end inserted into a rectangular coupling hole on the respective coupling shaft and supported on the corresponding compression spring, and a bevel gear at an opposite end meshed with the bevel gear at the transmission member in an adjacent coupling shaft.

Abstract: A reversible ratchet wheel positioning arrangement includes a box end body for holding a ratchet wheel, a screw cap detachably threaded into an inner thread in the box end body to hold a ratchet wheel in the box end body, and a toothed stop rod mounted in a transverse hole in the box end body and shifted in the transverse hole between a left position and a right position to limit the direction of the ratchet wheel being installed in the box end body, wherein the stop rod can be rotated in the transverse hole between a first position and a second position subject to the type of teet of the ratchet wheel being isntalled in the box end body.

Abstract: A ratchet wrench stop member positioning arrangement having a stop member mounted in a transversely extended side hole in the body thereof and forced by a spring member into engagement with peripheral teeth of a ratchet wheel in a box in one end of the body, wherein the longitudinal central axis of the side hole defines with the horizontal line which passes through the center of the box a container angle at about 8˜18° so that the angle of action produced between the stop member and the ratchet wheel during the operation of the ratchet wrench is minimized, reducing the formation of inactive componenet of force.

Abstract: An angle-adjustable box end wrench, which includes a handle having a front coupling block and a transverse receiving open chamber, a box end pivoted to the front coupling block of the handle, the box end having two toothed portions disposed at two opposite sides of the front coupling block, a locking mechanism mounted in the transverse receiving open chamber and controlled to lock the box end, the locking mechanism including a long rod member and a short rod member longitudinally connected together and moved in and out of the receiving open chamber between the locking position and the unlocking position, the long rod member and the short rod member each having a toothed portion for engaging the toothed portions at the web area of the box end, a spring, which holds the long rod member and the short rod member in the locking position, and a screw threaded into a top screw hole on the handle and stopped at a flat shank portion at the long rod member to stop the long rod member from rotation.

Abstract: An open end wrench having a mouth defined between two jaws and a nest. A longitudinal series of transversely extended flat teeth are provided at each of the two jaws within the mouth, so that the longitudinal series of transversely extended flat teeth includes a first tooth remote from the nest, a third tooth adjacent to the nest, and a second tooth spaced between the first tooth and the third tooth by a respective transverse groove. The first tooth has a front side remote from the second tooth and a rear side adjacent to the second tooth. The longitudinal lengths of the first tooth, the second tooth and the third tooth have a ratio of 4:3:3:. The longitudinal length of the longitudinal series of transversely extended flat teeth is equal to 0.39 of the width of the mouth, and 0.77 of the distance from the front side of the first tooth to the nest.