Abstract: A wrench, connectable to a standard square shaped extension, has a wrench head with opposed jaw faces which together define a plane that lies perpendicular to the respective jaw faces. A standard square shaped extension socket is affixed to the wrench head, where a standard square shaped extension can be inserted into the standard extension socket, along a direction that is non-orthogonal to the transverse plane. The standard extension socket can be attached to a frame of the wrench head, or to a rotatable guide which controls movement the opposed jaw face which is movable.

Abstract: The present disclosure is directed to an apparatus for use with an adjustable wrench to limit the displacement of a broken portion of the adjustable wrench relative to the remaining parts of the adjustable wrench when the wrench fractures.

Abstract: A gas supply warning and communication system to generate and communicate alarm signals indicating gas pressure and gas flow malfunctions in a pressurized gas system, and to open a reserve gas reservoir in the event of certain types of malfunction. The system stores, transmits, and makes available for download, gas pressure, gas flow, and oxygen concentration data, and information regarding the status of the system. The system also accepts commands for modification of system function from users of remote devices. A software product encoding methods for operating the gas supply warning and communication system. A motorized reservoir changing device including a universal valve coupler, and methods for operating a reservoir valve with the reservoir changing device. A gripper tube for secure connection of gas lines linking components of a pressurized gas system.

Abstract: An adjustable wrench has a wrench body, a clamping element, and a ratcheting jaw. The wrench body has a handle, a head, and a thumbscrew. The head is formed on the handle and has a connecting block, a fixed jaw, a curved slot, two pin holes, a positioning pin, a mounting recess, two pivot holes, and a sliding slot. The clamping element is connected to the wrench body and has a sliding bar, a ribbed slab, and a movable jaw. The ribbed slab is formed on the sliding bar and is mounted in the sliding slot. The movable jaw has an engaging surface and a positioning block. The ratcheting jaw is a curved block capable of sliding forward and retracting backward inside the curved slot and has two mounting boards, a receiving recess, an engaging surface, an abutting surface, an engaging protrusion, a holding recess, and an elastic element.

Abstract: A tool and method for loosening, for example, a nut connecting an HP rotor to an intermediate housing of a twin-shaft turbojet engine and forward fan including an LP turbine module, an HP module with an upstream journal of the HP rotor, and an intermediate housing with a support bearing of the HP rotor journal. The journal is held in the bearing by the connecting nut. The method includes inserting the tool for loosening the connecting nut after having cleared access to the nut. The loosening tool includes a tube and a plurality of fingers retractable between a position in which they are housed in the tube and a position in which they are deployed radially. The tool is installed with the retractable fingers deployed and in contact with all of teeth of the nut, and an unscrewing rotational torque is then applied to the tool.

Abstract: An adjustable nut wrench comprising a handle section and a slide guided element that is pushed by a spring to a position where abutment surfaces are paralleled to two or three nut's sides. A first embodiment of the wrench comprises two paralleled abutment surfaces which set by the angle of maximal 60 degrees to a direction of the sliding element movement. A second embodiment of the wrench has three abutment surfaces located by the angle of 60 degrees to each other and one of them is sliding.

Abstract: Flanges become stuck upon large pipes. This invention is a flange tightening tool in combination with a wrench, or other handled tool, having a fixed jaw integral with a handle and a movable jaw. The invention provides pins connected to each of the fixed jaw and the movable jaw. The pins extend mutually parallel and from the same side of both jaws. The pins generally have a round cylindrical shape with a diameter compatible to a flange aperture. The pins have a connection to the wrench utilizing a threaded tip that engages a cooperating threaded hole in each jaw. The pins are provided in various diameters, often in kit form. One pin may be longer than the other pins and both pins have left hand threading.

Abstract: An adjustable wrench comprises a handle. At least one end of the handle is provided with a straight claw (2) and an oblique claw (1), which form a wrench jaw by a certain angle. The straight claw is provided with an adjusting slider (4) capable of moving along the length direction of the straight claw and the adjusting slider comprises an oblique face (41) in action with a nut, and the oblique face is parallel to the inner surface (11) of the oblique claw forming the wrench jaw. The adjustable wrench retains advantages of a solid wrench which is precise in the opening size and not easy to slip, and solves the problem that the opening width of the existing solid wrench cannot be adjusted. Meanwhile, the adjustable wrench completely retains the advantage of the existing adjustable wrench which is continuously adjustable in the opening width, and solves the problems that since a shifting wheel and a rack are easy to abrade, slipping is easy to occur or nuts can be damaged.

Abstract: A tool (10) for rotating a screw-on oil filter cartridge, the tool comprising a driving member (28, 28b); gripping jaws (12a, 12b) movable in relation to each other for gripping an oil filter cartridge; a guide arrangement (13, 14a, 14b) for guiding the gripping jaws; means (16a, 16b) for biasing the gripping jaws towards each other; and a driving mechanism (28, 28c, 24, 22a, 22b, 20a, 20b, 21a, 21b) coupled to the driving (28b) member and gripping jaws (12a, 12b) for converting rotation into movement of the gripping jaws towards each other, into engagement with an oil filter cartridge and applying either screwing or unscrewing torque thereto. The tool comprises: a locking mechanism (30, 32, 28, 24) for releasably locking the gripping jaws (12a, 12b) at a pre-determined distance from each other; and a release actuator (28a) for unlocking the locking mechanism and releasing of the gripping jaws.

Abstract: A universal offset wrench with a width-adjustable head for fire sprinkler systems includes an operating end having a width-adjustment mechanism used to expand and retract an adjustable jaw relative to a fixed jaw. The adjustable jaw accommodates sprinkler heads of various sizes and types. The offset operating end can be used with concealed sprinkler heads by allowing the wrench to fit under the sprinkler head while clearing ceiling obstructions.

Abstract: A positioning function when a width-across-flats dimension of a tool is adjusted and a function of preventing a deviation in the adjusted width-across-flats dimension are fulfilled by a projection of a flat spring part being fitted into each fitting recess. By selecting the line of a fitting recess to be used according to the standard of an object to be clamped such as a nut, the positioning function and the function of preventing a deviation can be easily and reliably fulfilled even for the width-across-flats dimensions of different standards.

Abstract: An adjustable wrench having a fixed jaw and a movable jaw is shown and described. In one example, a wrench can be set to at least one predetermined opening using a removable pin.

Abstract: A wrench drive socket having jaws, actuated by a cam mechanism, facilitating the accommodation of a range of faceted work pieces is provided wherein adjustment of the distance between the jaws having V-shaped grips is accomplished by rotation of a knurled adjustment collar circumferentially disposed around a socket sleeve and fixed to an internally positioned jaw guide, the rotation of the jaw guide selectably positioning cam followers on the jaws against arch shaped cam profiles fashioned along the inside circumference of the socket sleeve, the sleeve being fixed to a centrally disposed socket body having an engaging hole to receive a drive shaft of a wrench such as a ratchet wrench. The adjustable drive socket provides advantages over the prior art including simplified construction, convenience of use, durability, effectiveness, and cost and weight reduction through the elimination of a plurality of sockets having fixed sizes.

Abstract: A wrench includes a main body with a fixed jaw and a sliding slot, a jaw portion, and a handle with a toggle element. The jaw portion has a movable jaw wherein a bottom of the movable jaw forms a sliding portion forming a restricting recess. A contact surface between a bottom of the sliding portion and a bottom of the sliding slot defines an interface wherein an extension of the interface traverses the restricting recess. When the handle is at a driving position, the toggle element abuts against the sliding portion, and the extension of the interface traverses the toggle element. When the handle is at a release position, the movable jaw is able to move away from the fixed jaw. Thereby, the pulling force from a user can be fully transmitted to the movable jaw and the fixed jaw.

Abstract: This disclosure is related to an adjustable wrench for engaging work objects. The adjustable wrench has a handle having a handle end and a flat serrated jaw surface. The adjustable wrench also has an L-shaped movable jaw having a lever arm and a serrated jaw, the lever arm having a terminal end and an opening therein. The adjustable wrench further comprises a projection extending from the handle having a tunnel therein for accepting the lever arm of the L-shaped movable jaw and a grip enhancing apparatus.

Abstract: This disclosure is related to an adjustable wrench for engaging work objects. The adjustable wrench has a handle having a handle end and a flat serrated jaw surface. The adjustable wrench also has an L-shaped movable jaw having a lever arm and a serrated jaw, the lever arm having a terminal end. The adjustable wrench further comprises a projection extending from the handle having a tunnel therein for accepting the lever arm of the L-shaped movable jaw and a grip enhancing apparatus.

Abstract: An adjustable nut wrench comprising a handle section and a slide guided element that is pushed by a lever or a spring to a position where abutment surfaces are parallel to two or three of the nut's sides. A preferred embodiment of the wrench comprises two parallel abutment surfaces which are set to a maximum angle of 60 degrees to the direction of the sliding element movement. Another embodiment of the wrench has three abutment surfaces separated by an angle of 60 degrees to one another where one of them is sliding. In further embodiments of the wrench the same method, using a moving sloping abutment surface for a jaw locking, is used.

Abstract: The present invention provides an adjustable wrench which can suppress backlash or clearance play of a movable body with respect to a main body in all directions orthogonal to a direction in which a pair of jaws come into contact with and separate from each other. An adjustable wrench further includes first urging means that urges a columnar portion such that the columnar portion is held in a state in which an axis of the columnar portion crosses an axis of a guide hole portion at an inclined angle in each of both a direction from the axis toward an open portion in the guide hole portion and a direction orthogonal to the above direction and the axis of the guide hole portion.

Abstract: An adjustable socket structure contains a body including a first groove, a second groove, a first notch, a number of slots; a plurality of paws, each including a sliding block, and the sliding block including a first hole; a number of connecting rods, each being movably fixed in the second groove and including a first axial shank and a second axial shank; a driving shaft including an axial portion and a disk portion, wherein the axial portion includes a square bore, and the disk portion is rotated in the first groove and includes an outer diameter larger that the axial portion and three second holes so that the driving shaft is rotated to actuate the paws to move in the slots respectively by using the connecting rods; a helical retaining ring retained in the first notch to abut against a rear end of the disk portion of the driving shaft.

Abstract: An adjustable socket structure contains a body including a first groove, a second groove, a first notch, a number of slots; a plurality of paws, each including a sliding block, and the sliding block including a first hole; a number of connecting rods, each being movably fixed in the second groove and including a first axial shank and a second axial shank; a driving shaft including an axial portion and a disk portion, wherein the axial portion includes a square bore, and the disk portion is rotated in the first groove and includes an outer diameter larger that the axial portion and three second holes so that the driving shaft is rotated to actuate the paws to move in the slots respectively by using the connecting rods; a helical retaining ring retained in the first notch to abut against a rear end of the disk portion of the driving shaft.

Abstract: An adjustable wrench is provided which provides several advantageous aspects. One aspect of the wrench is to facilitate rapid adjustment of the jaws, which are typically spring biased toward one another. Another aspect is the ability to adjust the jaws according to Metric system measurements or English system measurements or the like. A further aspect is the quick and effective tightening of the jaws.

Abstract: A wrench and wrench kit whereby a single connected unit is releasably attached and allows a user to access separate wrench handles from the detachment and further where said wrench handles are provided as a kit wherein attached handles have identical size wrench heads.

Abstract: A multi-function tool comprises a shank body including a plurality of located grooves aligned thereon longitudinally; a pry bar including a first section, a second section extending from the first section for prying, a first receptacle longitudinally piercing the first section for slidably mounted on the shank body and two second receptacles transversely piercing the first section and in communication with the first receptacle; two clutches respectively disposed in the second receptacles for alternatively engaging with a selective one of the located grooves; and a foot hold disposed onto the bottom of the first receptacle; wherein the second end of the shank body is inserted through the first receptacle of the pry bar and installed to the foot hold, with the foot hold being able to rotate relative to the shank body.

Abstract: This is an invention that permits the construction of tools that are especially efficient, convenient, and economical. The tools in this invention are adjustable wrenches, a ring wrench, an open end wrench and a pipe wrench, intended for loosening and tightening bolts having heads of various sizes, while they accurately grip the head of the bolt. Ther wrench is adjusted to the bolt immediately in a continuous movmement. We refer to closed and open endede wrenched for suitable bolts, in metric of inch sizes, or a combination of these, as well as a pipe wrench. The current invention offers a wrench that requires only one hand to be used for loosening and tighetning any bolt, smoothly and preciesely, and without damanging the bolt itself. Adjustment to the size of the head of the bolt is done in a smooth and continuous movement, at the end of which the wrench is locked precisely on the size of the bolt.

Abstract: Among other things, an open-ended wrench comprises a wrench head defining an opening to receive a work piece. The wrench head comprises a first jaw including at least a first surface to engage with a surface of the work piece, a second jaw including a first curved surface facing the opening, and a plate mounted on the second jaw and movable relative the second jaw. The plate comprises at least a second surface to engage with another surface of the work piece. The plate also comprises a second curved surface engaging the first curved surface and being slidable against the first curved surface.

Abstract: An adjustable clamping tool of the present invention includes a rotatable disc, two clamp portions, two slidable shanks, two rails and a housing member. When the rotatable disc is turned, the clamp portions are therefore driven to move toward or away from each other along the rails.

Abstract: An improved jaw apparatus is provided for making or breaking a tubular pipe connection. The jaw includes a head adapted to receive a hook having a threaded shank end. The threaded shank end is engaged at the head end opposite the hook end by a hydraulic powered nut adjustment assembly. The adjustment assembly may be operated by a control unit to allow for the automatic opening and closing of the jaw for receiving pipes of varying diameters.

Abstract: A sprinkler head shut off device, comprising of a handle with at least one jaw, a lever, a stopper arm, and a means for reciprocating the stopper arm as the lever is rotated, in order to bring a portion of the stopper arm in contact with the orifice of the sprinkler and stop water flow. The device further comprises a locking means to lock the lever in position. The locking means comprises a member attached to the lever which locks its rotary motion in one direction at a particular position by engaging with a portion of the means for reciprocating the stopper arm.

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: An improved jaw apparatus is provided for making or breaking a tubular pipe connection. The jaw includes a head adapted to receive a hook having a threaded shank end. The threaded shank end is engaged at the head end opposite the hook end by a hydraulic powered nut adjustment assembly. The adjustment assembly may be operated by a control unit to allow for the automatic opening and closing of the jaw for receiving pipes of varying diameters.

Abstract: An adjustable clamping tool of the present invention includes a rotatable disc, two clamp portions, two slidable shanks, two rails and a housing member. When the rotatable disc is turned, the clamp portions are therefore driven to move toward or away from each other along the rails.

Abstract: A hand tool device incorporates a fluid operated mechanism actuable by a plunger pressurizing a reservoir to force fluid past a resiliently biased valve to a fluid filled cylinder accommodating a piston carrying a contact member for clamping a work piece in the manner of an adjustable wrench or pliers. Continued operation of the plunger increases the pressure applied to the work piece.

Abstract: An adjustable wrench for gripping hexagonal and other shaped heads includes two slightly non-parallel jaw faces, wherein one face is smoother than the other. The angle between the two jaw faces is extremely shallow to create a “snap-action” geometry. Combining that geometry with jaw faces of unequal roughness can result in a desirable binding action that causes the wrench to tightly grip the head. In some cases, the wrench will continue clinging to the head even after the user releases the handle of the wrench.

Abstract: A fast adjustable spanner comprises a body of which an action side is provided with a protruding stationary jaw of which a bottom is formed with a glide path communicating with an accommodation slot provided in the body; a movable jaw provided with a sheath fringe corresponding to the glide path on which the adjustable jaw may transversally move, a tooth portion being provided at a bottom of the sheath fringe; a working part provided in the accommodation slot to lengthways move, a protruding joint portion being above the working part and having a screw; at least one elastic part between the working part and the accommodation slot, supporting the working part for wedging the screw to the tooth portion of adjustable jaw; thus, when being compressed with an external force, the elastic part is separate from the tooth portion of adjustable jaw for fast adjusting the movable jaw.

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 hand tool device incorporates a fluid operated mechanism actuable by a plunger pressurizing a reservoir to force fluid past a valve to a fluid filled cylinder accommodating a piston carrying a contact member for clamping a work piece in the manner of a wrench. Continued operation of the plunger increases the pressure applied to the work piece.

Abstract: A toothless adjustable spanner includes a handle, a head at one end of the handle; a fixing jaw extending from the head; the head being formed with a sliding groove and a receiving groove in the head and communicated to the sliding groove; a sliding rod being received in the sliding groove and installed below a movable jaw; the movable jaw being installed in the sliding groove; the sliding rod has an inclined lower surface; at least one rolling rod being installed in the receiving groove; an elastic unit resisting against rolling rod toward the movable jaw so that the rolling rod resists against the inclined lower side of the sliding rod; at least one driving sheet installed at one outer side of an opening of the receiving groove; and the sliding rod being installed to the driving sheets so that the sliding rod moves as the driving sheets move.

Abstract: An adjustable socket having first and second jaw members having manually selectable sizes. An exterior drive unit and a moveable inner driver unit each having serrated interlocking teeth are positioned to either engage during wrenching, or to be disengaged for socket size manual adjustments. The opposing first and second jaw members are forced by axial rotation of a spiral cam element located on the open top end of the outer drive unit to move laterally, inward or outward, when a user pulls the inner driver unit in a first direction and rotates the inner drive unit such that the first and second jaw members are positioned to engage a selected fastener head.

Abstract: A receptacle which is configured to receive a fastener element having a hexagon, or some other polygonal profile, and which is configured to rotationally or angularly orientate the insert fastener element. One version of the receptacle provides that the receptacle is in the open position as a fastener element is dropped therein. Then, a jaw cylinder closes the receptacle, thereby orientating the fastener element. Another version of the receptacle uses springs instead of a jaw cylinder, and orientates the fastener element upon rotation of a threaded shaft of a pulling head.

Abstract: The invention is an adjustable wrench comprising a handle with a terminal end and grip end, the terminal end defining a lower bolt claw. A jackscrew is slidably coupled to the handle, the jackscrew being movable to control the movement of the upper and central bolt claws. The upper, central, and lower bolt claws are fitted to the shape of a standard hexagonal bolt head, being adjustable to different sized bolts upon terminal or distal movement of the jackscrew relative to the handle. The central bolt claw is fitted through a slot in the upper bolt claw which defines an inclined ramp surface such that movement of one claw is coupled to movement of the other claw. The claws move cooperatively in reaction to the stationary, lower bolt claw to form a tightly fitted surface for a bolt head.

Abstract: The adjustable wrench has two wrench elements each having a jaw portion and a body portion, each body portion having angled tongues and grooves, slideably mounted opposite one another with the jaw portions opposing each other. Between the two body portions is an actuator having two sides. Each side has angled tongues and grooves corresponding to and slideably engaging the angled tongues and grooves of each of the body portions. The actuator moves along a longitudinal axis of the handle thereby urging the wrench elements and jaws towards and away from one another depending on the direction of movement of the actuator, by interaction of the inclined grooves, acting as wedges using the inclined plane principle.

Abstract: A lightweight, adjustable wrench comprising of a moveable jaw with a reach that is shortened or lengthened with a strap or a cable. The loose end of the strap or cable is secured to the wrench's shank by a cam lock, or similar locking device. Since the strap or cable is the means for the wrench's jaws adjustment, a quicker and easier fit to the pipe or object to be gripped can be obtained. The wrench is more convenient to adjust, since the means for adjustment are located near the handle of the wrench as opposed to the shank end of present designs. The strap or cable adjustment also allows the wrench's shank and handle to be designed hollow and a larger diameter to reduce weight. The wrench can be made in any proportion for any sized application.

Abstract: The automatically adjusting gripping device grips a workpiece ever more tightly as greater torque is applied thereto. The device has a base plate having a linear guide slot or series of radial guide slots, with a pair of jaws residing in each slot. A torque application component rotates relative to the base plate, and has a cam track of varying diameter in which the heads of the jaws ride. Rotation of the torque application component and cam track relative to the base plate causes the jaw heads to slide along the track due to the jaws being captured within the base plate slot, thereby changing the span between jaws as the cam track diameter varies at the jaw head locations. The gripping device is useful as an adjustable wrench but may be applied to other environments as well, e.g., as an automatic gripping and releasing device in conveyor systems, etc.

Abstract: A retractable open-end wrench has a handle defining a web at one end thereof. A stationary jaw projects from a first side of the web, and a first channel is formed at a second side of the web opposite the first side, the first channel being defined by a first arc. A moveable jaw is received by the first channel and moves linearly through the first channel, wherein the jaws form an open end therebetween. A second channel formed in the movable jaw is defined by a second arc, wherein a length of the first arc is greater than a length of the second arc. Moreover, a first radius of the first arc is smaller than a second radius of the second arc, and the first channel and the second channel form a receiving hole.

Abstract: An adjusting device for a tool includes a body with two ends and a fluid filled passageway, which extends between the ends, one end of the body cooperates with a work piece. An actuating member is movably connected to one end of the body, communicates with the fluid in the passageway, and has a surface, which cooperates with the work piece. Another actuating member is movably connected to the other end of the body and communicates with the fluid, and moves the fluid against the first actuating member to extend it. The fluid is locked against the first actuating member so that it retains the work piece in the body end.

Abstract: The ratchet wrench of this invention includes a jaw adjustment assembly connected with a jaw and gear assembly carried by a wrench head. Components of the jaw adjustment assembly include a scroll plate inside a cap operated by a jaw adjustment disk located above the cap. The jaw adjuster disk is connected with the scroll plate using a snap ring. Components of the jaw and gear assembly include a pair of jaws supported and guided inside a gear unit with the aid of parallel support rails. The support rails connect the rear unit with the jaws and support the jaw and gear assembly from a wrench head and handle. The two assemblies are pressed and held together by a splined inner surface of the cap interfacing with a splined outer surface of the gear unit. A typical pawl assembly provides the ratchet operation of the ratchet wrench.

Abstract: An adjustable wrench includes a handle with a fixed jaw extending from a head of the wrench and a groove is defined in an end of the head and communicates with a through hole defined transversely through the head. The through hole forms a circular hole in an outer surface of the head and located beside a root portion of the fixed jaw. A movable jaw has a cylindrical rack piece which is movably inserted in the groove and the through hole. A flange is connected between the movable jaw and the rack piece. A thumb screw is rotatably engaged with a hole defined through the head and engage with the rack piece.

Abstract: An adjustable hex wrench structure, in its basic embodiment, requires only two parts: a main body configured with a socket cavity having special modified hex cross-sectional shape, and a clamping screw, traversing a wall of the main body, for securing a hex fastener in place in the socket cavity. In socket wrench embodiments the main body is made cylindrical in shape and configured with a square driver opening to engage the square end of a conventional socket driver shaft. In a dual socket wrench version, two different-sized socket cavities, one in each end region of the main body, provide an overall 2:1 size range: e.g. ¾? to ??; the square driver opening is configured in a central bulkhead in the main body so that, whichever socket cavity is deployed to drive a hex fastener, the square end of the driver shaft can be inserted through the other socket cavity, at the opposite end of the main body, to engage the square driver opening.

Abstract: A pliers head (1) for pressing work pieces includes a stationary die (20) and a movable die (19). A first element (15) is designed as a comparatively stiff housing (5). A second element (16) is designed as a lever (7). The lever (7) is subjected to a pretensional force (36). The pretensional force (36) has at least the value of a predetermined maximum pressing force of the pliers head (1). The first and second element (15, 16) are designed as separate parts, and they form a C-shaped mouth (14). The dies (19, 20) are located in the C-shaped mouth (14). A joint (10) is located at the first element (15), and it allows for pivotal movement of the second element (16) with respect to the first element (15). A stop (32) secures a parallel position of the stationary die and the movable die with respect to one another. As a result, the resulting pretensional torque counteracts the pressing torque, and the parallel arrangement of the dies (19, 20) is maintained.

Abstract: An adjustable wrench comprises a handle and a head extending from the handle. A jaw is mounted in a clamping space of the head and movable relative to an end of the clamping space upon operation of a knob. A clamping member is mounted to an end of the jaw. An elastic element is provided for biasing an end of the clamping member into the clamping space so as to press against a fastener in the clamping space. The adjustable wrench drives the fastener when the adjustable wrench is turned in a first direction. The adjustable wrench is turned freely without driving the fastener when the adjustable wrench is turned in a second direction opposite to the first direction.