Abstract: A pipe wrench is provided, including a first lever member, a pivot and a second lever member. The first lever member includes a first grip portion, a first clamping portion and a body portion, and the body portion has at least one guide toothed groove. The pivot is slidably disposed within the at least one guide toothed groove, and the pivot is slidable along an axial direction to be on a locked position or a released position. The second lever member include a second grip portion, a pivot hole and a second clamping portion, and the pivot is disposed through and pivoted to the pivot hole.

Abstract: A reversible monkey wrench is provided. An end of a head is formed with a fixed jaw, a sliding rail and a receiving slot. The movable jaw has a sliding rod slidably disposed in the sliding rail. The axial rod is disposed in the head and extended into the receiving slot. A worm gear has an engaging portion corresponding to the sliding rod and an axial bore for receiving the axial rod. The worm gear is slidably disposed in the receiving slot and an end thereof is formed with a first dragging portion. A dragging mechanism is disposed around the axial rod and circumferentially contacted with the first dragging portion, dragging portion and friction between the first dragging portion and the dragging mechanism can prevent simultaneous rotation of the worm gear.

Abstract: A ratchet-action open-end wrench of the present invention has a simplified structure. Arc-shaped abutting surface and corresponding groove is dismissed from the present wrench. Thus, components of the wrench can be manufactured and fabricated easily, and specified producing process can be chosen for obtaining strengthened structure. In addition, cost of the wrench is abated, precision of the wrench is arisen, and lift-time of the wrench is prolonged.

Abstract: A reversible open end wrench includes a handle, a head and a retainer. The head includes a first jaw, a second jaw and an extension section. The jaws and the extension section define a driving area therebetween. The first jaw has a first engaging surface and a distal end. The second jaw has a second engaging surface. The horizontal distance between the two engaging surfaces is s. The retainer is disposed on the distal end and has a retaining end extending toward the driving area. The retaining end is movable between a first position and a second position. As the retaining end locates at the first position, the horizontal distance between the retaining end and the second engaging surface is smaller than s. As the retaining end locates at the second position, the horizontal distance between the retaining end and the second engaging surface is no smaller than s.

Abstract: A reversible monkey wrench includes a handle, a head, a slidable jaw, an axial rod and a worm gear. The handle has a connecting end for the head to abut thereagainst. The head is formed with a fixed jaw, a sliding rail, a receiving slot and a connecting bore. The connecting bore communicates with the receiving slot. A movable pin and a spring are disposed between the connecting end and the head. A top of the movable pin selectively inserts through the connecting bore. The spring urges the movable pin so that the movable pin may abut against the connecting end. The worm gear is adapted to control the slidable jaw to move and is slidably disposed in the receiving slot with respect to the axial rod. The movable pin selectively abuts against the worm gear to prohibit the worm gear from sliding.

Abstract: A reciprocatable open end wrench comprises a swing member allowing to slide relative to a concave arcuate surface of a second jaw, the radius of a convex arcuate surface of the swing member is equal to that of a concave arcuate surface of the second jaw, and between the concave arcuate surface and the convex arcuate surface is provided with an engagement structure having a slot member and a peripheral protrusion so as to engage with each other. Besides, the reciprocatable open end wrench further includes a stop portion for resisting against the torque of the swing member, thereby enhancing the strength and preventing the related components to be damaged.

Abstract: A wrench includes a fixed jaw and a sliding jaw which has a cylindrical guide portion and two toothed surfaces are defined in axial direction of the portion. The two toothed surfaces are made by Metric and English systems respectively. Two pawls are engaged with a through hole in the head each include an engaging surface in a first end thereof and the engaging surface is composed of teeth which are removably engaged with on of the two toothed surfaces. The two respective engaging surfaces of the two pawls are made by Metric and English systems respectively. An operation unit controls the two pawls to be engaged with or disengaged from the two toothed surfaces of the sliding jaw.

Abstract: A monkey wrench includes a handle, a head, stationary jaw, a movable jaw and a jaw-moving element. The head is formed at an end of the handle and made with a side, a groove in the side and an opening in communication with the groove. The stationary jaw is formed on the head and made with a first nut-contacting face, a second nut-contacting face next to the first nut-contacting face, a bulge on the first nut-contacting face and a recess next to the bulge. The movable jaw is movably disposed in the groove and formed with a nut-contacting face and a bulge on the nut-contacting face thereof. The jaw-moving element is disposed in the opening and engaged with the movable jaw so that the jaw-moving element is operable to move the movable jaw relative to the stationary jaw.

Abstract: A wrench includes a handle and an open-end with two jaws and each jaw has a driving surface. Each driving surface has a contacting area and two yielding areas. The contacting area is located between the two yielding areas and includes a contact portion and two notches. The contact portion is located between the two notches, and two extension areas each are connected between the yielding area and the notch corresponding thereto. A corner is formed at a joint area of the contact portion and an inside of the notch so as to bite a rounded fastener head. The contact portions are matched with straight sides of a normal fastener head.

Abstract: A positioning member is used to position the movable jaw to the sliding groove of the adjustable wrench and the adjustable wrench together with the positioning member are applied by vibrate grinding technology so as to make the outer surface of the movable jaw to be a mirror surface and the rod of the movable jaw is kept as the surface condition after being machine. The tolerance between the rod and the sliding groove is controlled within expected range.

Abstract: A positioning member is used to position the movable jaw to the sliding groove of the adjustable wrench and the adjustable wrench together with the positioning member are applied by vibrate grinding technology so as to make the outer surface of the movable jaw to be a mirror surface and the rod of the movable jaw is kept as the surface condition after being machine. The tolerance between the rod and the sliding groove is controlled within expected range.

Abstract: A method for making a wrench includes a step of making a mediate member, a movable jaw and an adjusting member, a step of applying heat treatment to the mediate member, the movable jaw and the adjusting member, a step of cleaning respective surfaces of the mediate member, the movable jaw and the adjusting member, and coating a anti-rusting layer on the mediate member, the movable jaw and the adjusting member, and a step of combination to put the mediate member in a mold and making a body by way of injection to integrally connect the mediate member to a head of the main body, the movable jaw and the adjusting member are installed to the body.

Abstract: An angle adjustable hand tool includes a driving head pivotably connected to a handle and a pawl is received in the handle and removably engaged with the teeth in the driving head. A button is engaged with a hole in the handle and perpendicularly communicates with the hole in which the pawl is received. The button includes a recess and a second contact surface connects the recess. When the button is pushed, the pawl is located in the recess of the button so that the driving head can be pivoted relative to the handle. The driving head is set when the pawl is engaged with the teeth of the driving head.