Abstract: A ratchet wrench includes a working head located forwardly on a handle. The working head has a body portion with a generally flat and generally uninterrupted upper surface and a cavity formed in an opposite lower surface with at least one actuator bore through the side wall of the body portion. A drive item is rotatably disposed in the cavity. A pawl item is disposed in the cavity to switch the drive direction of the drive item, and a pawl actuator pin is movably disposed in the actuator bore to switch the pawl. A retention plate may be used to mount the drive item and pawl item in the cavity plate. A quick release mechanism may include a longitudinally oriented and longitudinally slideable release actuator. The upper surface of the working head may be formed by the body portion or by a cover plate mounted thereto.

Abstract: A fixing structure of direction switch buttons for a reversible wrench, in which the wrench is equipped with two direction switch buttons on a driving portion of the wrench. The wrench includes button-restricting portions and location-restricting portions relative to the driving portion. The two direction switch buttons can be inserted and arranged inside the driving portion. Moreover, a button-fixing device is provided between the two direction switch buttons, the button-fixing device includes an actuating member and a restoring member. The two ends of the actuating member are wedged into the two direction switch buttons respectively so that the two direction switch buttons are driven simultaneously. The actuating member is able to move elastically between the two direction switch buttons by the restoring member so as to connect the two direction switch buttons elastically.

Abstract: A ratchet screwdriver with an assembly of a handle (10), a body (17), a gear (56), a pawl (21, 22, 71), and a selector (27) movable on the assembly. The selector carries a pawl actuator (38, 81) for pivoting the pawl, and there is a rotation lock (42, 92) on the selector for releasably holding the rotated selector. The selector can be axially, and also rotationally, movable on the body for controlling the lock. The assembly is along an axis (A), and there are a member (44) and axial force appliers (62, 64) effective between the body and the member, thus restricting axial movement in the assembly. There is provision for assembly along the axis from adjacent the handle. There are modifications and an assembly method.

Abstract: A one touch retractable ratchet wrench for use when side access to a workpiece is necessary. The ratchet wrench comprises an opening at one end for side application of a socket to a workpiece. The ratchet further comprises a retracting spring attached to a pawl containing the socket. A release control releases any restraint on the retracting spring, returning the pawl to a home position in which side access to and removal from a workpiece can be made.

Abstract: A ratchet screwdriver includes a handle, a ratchet, a shaft and a finger ring. The handle has a body having a receiving chamber and a front through hole. The receiving chamber is formed in the body and communicates with the front through hole. The ratchet is mounted in the receiving chamber and has a keyed driving protrusion and a drive selector. The shaft is mounted rotatably in the body and has a proximal end being mounted securely on the keyed driving protrusion. The finger ring is mounted securely around the shaft outside the body and is smaller than the handle to allow quick and easy rotation of the shaft.

Abstract: The invention is a wrench with jaws adjusted by a cam mechanism and a ratchet mechanism providing a free return stroke of the handle, a simplified construction, convenience of use, durability, effectiveness, and cost and weight reduction; comprising a handle with housing, annular control and adjusting discs, a plurality of radial guide slots in the adjusting disc and cam features in the control disc, a plurality of jaws in the housing, each jaw, having a slider spring loaded, is positioned in said guide slots, and a cam follower interacting with cam features formed on the inner edge of the control disc; radial guide slots on the surface of the adjusting disc facing the control disc, each guide slot limited by the inner arch-shaped edge of the adjusting disc and open on its periphery; cam followers and profiles provide wedging to the rotation of the discs during the return stroke.

Abstract: An interchangeably manual or automatic ratchet wrench tool comprises a tool body including a through grove disposed at one end thereof, for receiving a rotating member including peripheral teeth and driven teeth formed therearound, respectively. The tool body further includes a driving piece attached therein and having two engaging tabs mounted thereon for correspondingly engaging with the peripheral teeth of the rotating member, thereby driving the rotating member in a manual operating mode. Moreover, the tool body includes a motor driven by a power source assembly and affixed at another end thereof, the motor includes a worm shaft disposed at one end thereof, for meshing with a worm gear which is rotatably disposed in the tool body, and between the worm gear and the driven teeth of the rotating member is defined with a transmission set for couplingly urging the rotating member in an electric operating mode.

Abstract: A link attachment to a torque wrench providing coaxial action in the reaction turning forces in opposite directions at equal torque, the link attachment has a housing, a ratchet mechanism including a ratchet engageable with a fastener and a drive plate turning the ratchet, a first connecting structure for connecting the housing to a part of the torque wrench providing a reaction turning force and a second connecting structure for connecting a part of the torque wrench providing an action turning force for the at least one lever drive plate, so that a turning action of the torque wrench is converted into a linear action applied to the at least lever drive plate so as to turn the at least one lever drive plate and thereby to turn a fastener by the ratchet, while abutting against a nearby stationary object with the housing to stop the torque wrench from turning around the fastener to be tightened or loosened.

Abstract: In a ratchet wrench, a frictional force generation mechanism including a first guide bush and a disc spring is attached to a shank with a locking pin to form a shank assembly. Spring force of the disc spring acts only on the inside of the shank assembly. The shank assembly is inserted from a central space of a first annular hold portion toward a second annular hold portion, and the shank is held by an inner wall of the second annular hold portion. In the back side on which the shank assembly is inserted, the drop-out of the shank assembly from the central space side of the first annular hold portion is prevented by a snap ring attached to a groove of the first annular hold portion. With this arrangement, constant friction is applied to the shank.

Abstract: A pass through socket (12) and wrench (10) combination is disclosed wherein a first drive member (22a, 22b) is provided on the socket's exterior surface and a second drive member (24) is provided on the front side of the ratchet wrench's wheel (26) for engaging the socket's first drive member (22a, 22b) to enable the socket (12) to be driven with the wrench (10). The wrench's wheel (26) defines an axially aligned through hole (30) extending through the wheel (26) for receiving an insertable end of the socket (12) through the front side of the wheel (26). Socket retention means, preferably a snap ring mounted on the front side of the ratchet wheel (26), is also provided.

Abstract: A ratchet wrench includes a body with a head portion and a shaft. The head portion includes a cavity. A rotatable member is received by the cavity and is rotatable about an axis. The rotatable member has a plurality of teeth disposed around a circumferential surface thereof. A reversing member is pivotally mounted to the body, and is movable between a first position and a second position. A pawl is connected to the reversing member such that the pawl moves circumferentially relative to the axis of the rotatable member as the reversing member moves between the first and second positions. The pawl includes a plurality of teeth that intermesh with the plurality of teeth on the rotatable member. Substantially all of the teeth of the pawl remain intermeshed with the teeth of the rotatable member as the reversing member moves between the first position and the second position.

Abstract: A torsional force structure of a ratchet device which includes a body having a head portion at an end of the body. The head portion has a space which is composed of a first recess and a second recess. A socket member is fitted in the first recess and having a plurality of teeth. A ratchet member is fitted in the second recess and provided at two ends thereof with two wedge portions configured to be fitted in an angular region between the inner wall of the space and the socket member. When the triggering rod is first adjusted to move the ratchet member to make one of the wedge portions of the ratchet member fit in the angular region and the the socket member is rotated, the wedge portion of the ratchet member will be forced to be tightly fitted in the angular region thereby enabling the socket member to provide a positive rotating force.

Abstract: The present invention relates to a ratchet wrench including a wrench with one end provided with a pivot hole; a turning knob disposed in the pivot hole of the wrench and containing a dial; a wheel member disposed to the handle of the wrench and containing also a dial; and a turning member with one end disposed to the dial of the turning knob and another end disposed to the dial of the wheel member.

Abstract: A tire-assembly spanner which comprises a hollow handle installed with a bending tube portion at one end thereof; another end of the handle being installed with a holding portion; an engaging element installed to one end of the resisting portion far away from the handle; one end of the engaging element having an engaging portion for receiving a sleeve; one end of the engaging element having a ratchet teeth portion corresponding to the resisting portion; an inner side of the ratchet teeth portion being formed with an annular ratchet teeth. A switch is installed in the bending tube portion. A resisting portion is formed between the bending tube portion and the engaging element; the resisting portion has a through hole for receiving a switch.

Abstract: A wrench capable of switching sense of rotation comprises a handle, a head portion formed on one end of the handle and a switch mounted on the head portion of the handle. The head portion further comprises a ratchet wheel, a claw piece and an inverting piece. The switch further comprises two driving pieces downwardly extended from two lateral sides thereof. As either side of the switch is pressed down, the associated driving piece will be pushed against the inverting piece with a sloppy wall thereof, so as to restrict the rotation of the ratchet in one angular direction.

Abstract: A locating device for a one-way ratchet tool includes a lid, a ratchet, a detent, a resilient element and a wrench body. The wrench body comprises a chamber and a recess to accommodate the ratchet, the detent and the resilient element which are covered by the lid. The elastic element is disposed between the detent and the wrench body. The wrench body has its inner wall engaging with the detent to secure the detent in place to provide a precise and simple locating device for a one-way ratchet tool.

Abstract: A ratchet wrench has a through cavity in which a reversing lever is disposed. The reversing lever has a pair of protruding lips formed thereon opposite from one another. A cooperating ledge is formed on the head in the cavity and on the pawl which is adjacent to the reversing lever. A spring-loaded pusher is disposed longitudinally in a blind bore in the reversing lever and the pusher engages a pocket in the pawl. A cover plate is disposed on a shelf recessed on the bottom of the wrench and spaced apart from the reversing lever.

Abstract: A ratchet device constructed in accordance with one embodiment of the present disclosure is depicted. The ratchet device includes a ratchet body having a handle and a ratchet head. The handle is reciprocably rotatable in first and second handle directions about an axis extending substantially normal to a major axis of the ratchet head. The ratchet device further includes an output member coupled to the ratchet head, wherein the output member is rotatable in a substantially constant output member direction when the handle is reciprocated between first and second handle directions.

Abstract: An oil drain plug wrench is provided to enable a user to more easily remove and install an oil drain plug. The wrench includes a rotor with two cavities on opposite sides of a rotor. When either of the cavities engages a workpiece, the wrench is capable of applying torque to the workpiece in a first rotational direction and ratcheting in a second rotational direction. A flange is provided on the outer diameter of the rotor to allow a user to remove or install an oil drain plug by hand.

Abstract: A reversible ratchet wrench includes a handle from which a head extends. The head includes a compartment and a receiving hole in communication with the compartment. A drive member is rotatably mounted in the compartment and a pawl is slidably mounted in the compartment. A ring is mounted in the compartment and around an end of the drive member. A reversing plate is pivotably mounted to the end of the drive member and operatively connected to the ring to turn therewith. A switching member is pivotably mounted in the receiving hole of the head. The switching member is operatively connected to a tip piece of the ring to turn therewith. The switching member is operatively connected to the pawl to move the pawl for changing a driving rotating direction of the reversible ratchet wrench when the reversing plate is moved between two positions corresponding to two opposite driving rotating directions.

Abstract: A wrench includes a core plate made of metal and an outer portion such as rubber encloses the core plate. A driving member and a ratchet mechanism are received in the through holes in the core plate and the outer portion. A hammer piece is connected to a side of the outer portion and a chamber for receiving a bit connector and a plurality of notches for receiving bits are defined in an outer periphery of the outer portion.

Abstract: A ratchet tool includes a bar movably received in an operation space defined between an inner periphery of a cylindrical space in the head of the ratchet tool and a flat surface defined in an outer periphery of the cylindrical body of the driving mechanism. The bar is pushed toward two wedge-shaped areas in the operation space to control the effective direction of the driving mechanism. The bar is pushed to either one of the two wedge-shaped areas by two positioning units which are movably received in the cylindrical body. The tow positioning units are shifted alternatively by a shifting member mounted on the rod the quick release device which controls a bead for securing a socket mounted on the driving member of the driving mechanism. The efficient directions and the socket are both controlled by one-time operation of the quick release device.

Abstract: A ratcheting tool has a head and a handle attached to the head. The head rotatably receives a gear ring and receives a pawl that is in operative engagement with the gear ring. A housing disposed in the head receives a spring that is in operative engagement with the pawl so that rotation of a lever causes the pawl to move between a first position and a second position.

Abstract: A ratcheting tool having an axial pawl ratcheting mechanism is provided that may be used for a screwdriver or wrench and comprises a first gear including axial gear teeth on a first side providing for ratcheting in a first direction. A second bidirectional gear has axial teeth on both sides. The second gear is mounted to the first side of the first gear so that the first gear axial gear teeth engage the second gear axial gear teeth and provide an axial pawl ratchet assembly. A ratchet head is provided having an opening for receiving the axial pawl ratchet assembly therein in order to transfer torque between the ratchet head and the axial pawl ratchet assembly. An actuator is provided for adjusting the positioning of the axial pawl ratchet assembly between a first position and a second position.

Abstract: A selective one-way wrench includes a head defining a first space and a second space communicated with the first space. A gear is put pivotally in the first space. The gear includes a toothed external face. A direction controller is put in the second space. The direction controller includes two toothed faces. A spring pushes the direction controller to the gear. A direction switch includes a first element put pivotally on the head and a second element put in the second space and connected to the first element for bringing selected one of the toothed faces of the direction controller into engagement with the toothed external face of the gear.

Abstract: A ratcheting tool includes a body and a gear disposed in the body. The gear defines a plurality of teeth on a circumference of the gear so that the gear teeth define a first arc having a first radius. A pawl is disposed in the body so that the pawl is movable laterally with respect to the gear between a first position, in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction, and a second position, in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction. The pawl defines a plurality of teeth facing the gear, and the pawl teeth define a second arc having a second radius larger than the first radius.

Abstract: A ratchet screwdriver and method of making same wherein there is a handle and there is a ratchet gear and pawls inside the handle. An adjuster is inside the handle and is movable by a tool extending into the handle for positioning the adjuster relative to the gear and thereby eliminating play between the gear and the handle. Ball bearings are interposed between the handle and the gear and the bearings rotatably support the gear and transmit the anti-play forces that act on the gear.

Abstract: A positioning device for a two-way ratchet tool includes a switch assembly, a lid, a ratchet, a detent and a wrench body. The switch assembly comprises a switch and a stud to be inserted in a through slot of the lid. The stud is provided with an engaging block to link the detent. The ratchet comprises a through hole therein and gear teeth around its outer periphery. The detent is formed with gear teeth. The ratchet and the detent are accommodated in the wrench body. A first elastic element is provided in the wrench body to engage with the detent so that the gear teeth of the detent mesh with the gear teeth of the ratchet. A second elastic element is provided in the wrench body to engage with the switch of the switch assembly.

Abstract: A wrench includes a wrench body, an actuating member, a pawl member, a direction control knob, a positioning device, and a driving member. Thus, the direction control knob is mounted on the drive head of the wrench body after assembly of the pawl member and the driving member, so that the direction control knob is mounted on the drive head of the wrench body easily, rapidly and conveniently, thereby facilitating assembly of the wrench and thereby decreasing costs of production.

Abstract: A ratchet wrench includes a handle, which has a head and a bearing portion abutted to the head. The head has a through hole and a receiving portion inside the through hole. A driving member is rotatably mounted inside the through hole of the head by a mounting ring having an outside annular groove and a retainer. A pawl is disposed in the receiving portion and meshed with the driving member. A slider is mounted on the pawl and attached to the bearing portion of the handle and inserted into the outside annular groove of the mounting ring for allowing the slider to move along the outside annular groove of the mounting ring.

Abstract: A ratchet wrench rotatably operable in a vertical plane for removal and installation of a fastener includes a body with a shank portion and outwardly extending first and second member forming an offset in such body. A first ratchet mechanism disposed in a first head of the wrench attached to the first member and a second ratchet mechanism disposed in a second head attached to the second member are identical except for rotational direction enabling to remove the fastener with one end and install the fastener with the other end of the wrench.

Abstract: A ratcheting tool includes a body and a gear disposed in the body. The gear defines a plurality of teeth on a circumference of the gear so that the gear teeth define a first arc having a first radius. A pawl is disposed in the body so that the pawl is movable laterally with respect to the gear between a first position, in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction, and a second position, in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction. The pawl defines a plurality of teeth facing the gear, and the pawl teeth define a second arc having a second radius larger than the first radius.

Abstract: A ratchet useful for wrenches is provided having a pawl and a main gear that reside in a case, wherein the pawl is biased to engage teeth of the main gear to permit rotation in a selected direction. According to an aspect of the invention, a biasing mechanism is housed within the pawl and acts outwardly from the pawl against one or more ramped surfaces formed in the case, thereby biasing the pawl rotationally. For example, the biasing mechanism may be a coil spring housed within a bore extending through the pawl, aligned parallel to an axis of rotation of the pawl. The spring is compressed between two ball bearings, urging the ball bearings axially outwardly against the ramped surfaces. The ramped surfaces are shaped so that a component of the force of the ball bearings creates a rotational moment on the pawl.

Abstract: A bi-directional ratchet spanner with a ratchet control structure includes a first receiving portion for receiving a ratchet; a second receiving portion for receiving a braking block; and a third receiving portion for receiving a switch unit. The wall of the third receiving portion has a first trench and a second trench. One end of the switch unit in the third receiving portion is formed with a concave portion and a through hole. The concave portion receives one end of a positioning rod. Another end of the positioning rod is received in a sliding trench of the braking block; and a control element is received in the through hole. By moving the switch unit, the positioning rod and control element will control the rotation direction of the ratchet. The conductive wire includes a steel ball, a spring and a top rod.

Abstract: A ratchet wrench includes a handle, a drive head, a ratchet wheel, a pawl member, a control knob, a positioning plate, and an urging spring. Thus, the ratchet wrench includes a positioning plate to push the pawl member, thereby reducing the volume of the ratchet wrench efficiently. In addition, the urging spring is supported and guided by the guide shaft of the positioning plate, so that the positioning plate is not easily deformed, thereby facilitating movement of the urging spring in the positioning plate.

Abstract: A ratchet screwdriver includes a main rod, a driven shaft, a ratchet mechanism, a socket connector, a control member, and a handle. Thus, the pawl member of the ratchet mechanism is pivoted to engage the ratchet teeth of the socket connector by rotation of the rotation wheel of the control member, so that the ratchet screwdriver is operated easily and conveniently, thereby facilitating a user operating the ratchet screwdriver to drive a workpiece.

Abstract: The direction control device comprises a spanner body having a receiving chamber at a head portion thereof; a lateral side of the receiving chamber formed with a braking groove; the spanner body having a direction control groove communicated to the braking groove; a ratchet wheel being received in the receiving chamber and a brake block being received in the braking groove; the brake block being engaged to the ratchet wheel; a direction control unit received in the direction control groove; the direction control unit including a direction control block, a control sheet, and an elastic ejecting device; one end of the direction control block being formed with a control portion; and an upper end of the brake block capable of engaging with a ratchet wheel; a lower end of the brake block having an inserting hole and the brake block being formed with a notch near the inserting hole.

Abstract: A ratchet wrench comprises a main body having a hole at an action end; a ratchet having a polygonal groove at its center and a latch hole and a latch groove interconnected to the polygonal groove. The latch hole is disposed at the edge of the polygonal groove, and the latch groove is disposed at the corner of the polygonal groove, and the whole is accommodated in the hole of the main body. A latch ring is installed at the external side of the ratchet with its end bent into a latch end and passed into the latch hole of the ratchet, and the other end is bent into a latch surface to be latched into the latch groove, such that the latch end and the latch surface are slightly protruded from the polygonal groove. If the polygonal groove of the ratchet is sheathed onto an object, two different latch structures are defined between the latch ring and the object.

Abstract: A ratchet wrench includes a wrench body, a ratchet wheel, a direction control mechanism, a drive member, a ball, and a quick release mechanism. The quick release mechanism includes a bolt, a movable rod, a press knob, and an elastic member. Thus, the socket is mounted on and detached from the driving head of the drive member easily and rapidly, thereby facilitating a user mounting the socket on the driving head of the drive member and detaching the socket from the driving head of the drive member.

Abstract: A ratchet socket tool includes a socket having a toothed protrusion extending axially from an end thereof and a tube is mounted on the first end of the socket. A driving member rotatably inserts into the tube and has a passage defined axially therethrough and a recess is defined in an inner periphery of the passage so that a pawl is movably engaged with the recess and has a toothed surface for being engaged with the toothed protrusion of the socket. A biasing member has a first end engaged with a notch defined in an inner periphery of the tube and a second end of the biasing member extends through a hole defined through a wall of the driving member and engaged with a concavity in the pawl so as to push the pawl to engage with the toothed protrusion.

Abstract: Ratchet wrench has its head comprising an opening, a recess on a wall of the opening, a channel having one end open to the recess and the other blind end in the handle, and a trough on the handle proximate the wrench head, a reversing pawl in the recess and including a top groove and a rear cavity, a push button on the trough adapted to move between first and second positions by cooperating with a spring depressible detent for carrying out clockwise driving and counterclockwise ratcheting or vice versa, a reversing lever having one portion disposed on the groove and the other portion received in a slot of the push button, a spring biaser including one end in the cavity and the other end in the blind end of the channel, and a socket fastened in the opening and being meshed with pawl teeth of the reversing pawl.

Abstract: A ratcheting tool includes a body and a gear disposed in the body. The gear defines a plurality of teeth on a circumference of the gear. A pawl is disposed in the body so that the pawl is movable with respect to the gear between a first position, in which the body transmits torque through the pawl in a first rotational direction, and a second position, in which the body transmits torque through the pawl in an opposite rotational direction. The pawl defines a plurality of teeth facing the gear and engages a reversing lever that urges the pawl between the first and second positions. The reversing lever comprises a handle portion and bottom portion that receives a clip spring. The detent urges the pawl between the first and second position by engaging the walls of a recess in the back of the pawl.

Abstract: A pawl mechanism of a ratchet wrench, including a wrench main body, a pawl, a ratchet wheel and a shift member. Four engaging recesses are formed on a bottom of a first recess of the wrench main body. A first engaging channel and a second engaging channel are respectively formed on two sides of the pawl corresponding to two of the four engaging recesses of the wrench main body. A spring and a steel ball are disposed in each of the engaging channels, whereby the steel balls can be located in the corresponding engaging recesses of the wrench main body.

Abstract: A ratchet tool comprising a handle, a cartridge attached to the handle, a barrel rotatably received in the cartridge and having a gear and having a non-circular engaging hole, and one or more driving stems each having a non-circular end segment selectively engaged with the engaging hole of the barrel, for allowing the driving stems to be selectively rotated by the barrel. Two pawls are slidably received in the cartridge and each has one or more teeth biased to selectively engage with the gear of the barrel, and a control ferrule includes an actuator for selectively disengaging the teeth of the pawls from the gear of the barrel, to control the driving direction of the barrel and the driving stem.

Abstract: A wrench includes a body, a control device, a pawl and a joint. The body includes a handle and a ring. The control device includes a disc pivotally received in the ring and a stem projecting from the disc and including upper, lower and intermediate sections. The pawl is connected with the disc and formed with a toothed end for engagement with the teeth of the ring and two arc-shaped sides. The joint includes a disc received in the ring, an insert installed beneath the disc, stops installed on the disc for selective engagement with the arc-shaped sides of the pawl, and a ball detent trapped in a hole defined in the insert for selective engagement with one of the intermediate and lower sections of the stem.

Abstract: A wrench comprises a ratchet device in a ratchet box portion and including a downward bar, a lateral recess having first and second walls, and a bore in communication with the recess; a rotating disc including a shaft extended into the bore, and an actuation member on one side of the shaft; and a locking member in the recess and including an outer ratchet adapted to engage with the ratchet of the handle, an inner groove for receiving and being engaged with the actuation member in the recess, and third and fourth walls at both sides of the groove, either the third or fourth wall being adapted to contact the first or second wall when the locking member pivots to one of left and right positions in the ratchet device. Rotating the rotating disc opposite to the rotation of the handle will switch a direction of exerted force.

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: A ratchet wrench includes a handle, a drive head, a ratchet wheel, a control knob, and a substantially C-shaped limit spring. Thus, the control knob is rigidly and stably positioned in the receiving chamber of the drive head by the limit spring, thereby facilitating a user operating the control knob. In addition, the ratchet wrench only needs to provide a limit spring to position the control knob rigidly and stably, so that the ratchet wrench has a simplified construction, thereby decreasing costs of fabrication.

Abstract: An improved low profile ratchet wrench comprising a rotatable head and a handle, wherein a lever projecting from the free end of the handle permits selective adjustment of the unidirectional rotation of the ratchet wrench. The lever eccentrically rotates so as to urge a cam and cam teeth to engage the teeth of a ratchet wheel, thereby selecting an appropriate unidirectional path. In use, the unidirectional path may be changed by eccentrically rotating the lever in the opposite direction previously selected, thus permitting reversal of the ratchet head.

Abstract: A reversible ratchet type wrench includes a handle and a box end extending from an end of the handle and having a hole. A compartment is defined in a peripheral wall defining the hole of the box end and communicated with the hole. A receiving hole extends from a side of the box end toward the other side of the box end but spaced from the other side of the box end. The receiving hole intersects the compartment. A bulge portion is formed in a conjunctive area between the handle and the box end. A slot is defined in the bulge portion and communicated with the receiving hole.