Abstract: A ratchet wrench includes a head and a handle. The head is assembled with a switch member and an active mechanism which provides a ratchet function. The switch member is switched to selectively engage the active mechanism, so that the active mechanism may be fixed or be rotatable to achieve the ratchet function. Therefore, the wrench is provided with the function of ratchet which makes the wrench easy to use and with the function of fixing which makes the structure strength of the wrench strengthened. Conveniency of using wrench is improved.

Abstract: A ratchet (1) is provided, in particular a ratchet for surgical interventions or a dental ratchet, wherein the ratchet has a handle (2) and a pivot housing (4) arranged thereon, said pivot housing being a flat spiral (6). The spiral (6) is flexible and can be actuated such that the spiral (6) coils up in a plane that is oriented substantially vertically to the pivot axis D. The invention also relates to a torque transmission system which comprises a ratchet (1) and an implant driver. The implant driver has a first portion that is cylindrical and a second portion that is cylindrical or frustoconical, the second portion additionally having a receptacle for a medical tool, a surgical implant or any other object. In this way, an improved ratchet is obtained with which the torque to be applied can be applied to the implant driver in a metered manner.

Abstract: A ratcheting tool including a handle formed with an integral yoke at a first end and a tool head coupled to the yoke at a pivot. The tool head has a toothed hub facing rearwardly of the pivot and into the yoke. A locking spool is rotatably carried in the yoke adjacent the toothed hub. The locking spool has a first face, a second face, and a first tooth extending along both the first face and the second face and engaging the toothed hub. The locking spool is rotatable between a first position in which the first face is adjacent the toothed hub, thereby locking the tool head in a selected angular position with respect to the handle, and a second position in which the second face is adjacent the toothed hub such that the tool head is pivotable about the pivot.

Abstract: A pawl structure of ratchet wrenches has multiple engaging teeth, a first recess and a second recess. The engaging teeth include first teeth at the mediate portion and second teeth are respectively located at two ends of the engaging teeth. The tips of the first teeth are located on a first curve which has a center and a central line extends through the center and intersects the first curve. The tips of the second teeth are located on a second curve which gradually leaves from the center of the first curve along with the second curve extending away from the central line. The first recess is located corresponding to the central line and the first teeth. The second recess is located corresponding to the second teeth.

Abstract: A ratchet wrench includes a driving head, two retaining rings engaged in the driving head, a driving member rotatably engaged in the driving head and having a gear, and a pawl engaged in the driving head and having a lever arm extended from a shaft, and one or more teeth formed on the lever arm for engaging with the gear and for determining the driving direction of the driving member by the driving head and the handle, the shaft includes two end segments extended beyond the lever arm for forming two engaging surfaces and for engaging with the retaining rings and for allowing the retaining rings to apply a spring biasing force onto the end segments of the shaft and to force the teeth of the lever arm to engage with the gear.

Abstract: A ratchet wrench adjustable in clamping size is provided with a body, a ratchet wheel, an adjustment member, two engaging members and a spring. The body includes a head portion, a handle and a switch member. The two engaging members are oppositely located on the ratchet wheel and the adjustment member and each include an engaging portion, a neck portion connected to the engaging portion and located in the ratchet wheel, and an upper portion connected to the neck portion and located in the adjustment cavity of the adjustment member. By such arrangements, rotating the rotating portion of the adjustment member adjusts relative positions of the upper portions of the two engaging members in the adjustment cavity of the adjustment member, and makes the neck portions of the engaging members to move along the guide slot so as to change a distance between the two engaging portions.

Abstract: A ratcheting tool and a method of using the same, the ratcheting tool being formed by a handle, a substantially perpendicular cylinder and a ratcheting mechanism. The cylinder is adapted to be positioned over a nut or bolt head and comprises jaws adapted to engage the nut or bolt head when pushed laterally theretowards. When the arm is squeezed with the handle, a slider block is pushed towards the nut or bolt head causing the jaws to laterally engage the nut or bolt head. The ratcheting mechanism is between the cylinder and the jaws and allows torque to be applied to the nut or bolt head in a desired direction when the handle is moved in a circular motion around the main axis of the cylinder. The jaws are allowed to rotate within the cylinder in a direction opposite to the desired direction.

Abstract: The present invention relates to a tool having dual flex heads. The tool may have a flex head having a ratchet head and a flex head having a bit driver head. The flex heads may include a locking mechanism.

Abstract: In a ratchet wrench body and its manufacturing method, the body comprises a handle and a head, and the head has a through hole, a control compartment, and a slot chamber. The head has a first surface and a second surface, and at least one embedded hole formed between the slot chamber and the first and second surfaces, and each embedded hole is penetrated through one side but not penetrated through the other side, and each embedded hole is smaller than an elastic element and a propping element contained in the slot chamber, and the slot chamber is extended from each embedded hole inwardly towards the slot chamber and formed by the total volume occupied by adjacent intersected surfaces.

Abstract: A manufacturing method of an elastic C-shaped steel block is described, which includes the following steps. An ordinary steel is cut into a round steel tube. The round steel tube is processed into a ratchet hex socket steel tube. The ratchet hex socket steel tube is cut into a ratchet hex socket block. The ratchet hex socket block is transformed into an elastic ratchet hex socket block by a thermal treatment. An opening is formed in the elastic ratchet hex socket block to change the elastic ratchet hex socket block into a C-shaped elastic steel block.

Abstract: A hand wrench comprising a center handle (251) with two ratchet wrench heads (270 and 280) pivotally connected at each end of the center handle, with each ratchet wrench designed for attachment of a multi-size drive socket, wherein each ratchet heads have at last three functional position where each ratchet head comprises a stowed position where the ratchet and drive socket are in a stowed position where the user can place the wrench in their pocket, an operational position where the ratchet and drive socket are used as a ratchet and drive socket, and a handle position where the ratchet and drive socket operate as a handle.

Abstract: The present invention relates to a one-way freewheel clutch type wrench, more specifically to an indicator mechanism for providing audible and/or tactile feedback when a one-way freewheel clutch wrench rotated in the unrestricted, or “reloading”, direction. The indicator mechanism has a ratchet wheel with teeth attached to a one-way freewheel clutch socket which. interacts with at least one indicator located in a pocket of the box-end of the wrench.

Abstract: A torque wrench comprises a handle, a wrench head having a ratcheting workpiece engaging portion, and a tensor beam defining a longitudinal axis and having a rectangular cross-section perpendicular to the longitudinal axis. A first strain gauge is coupled to one side of the tensor beam, and a second strain gauge is coupled to another side orthogonal to the one side. A processor coupled to the first and second strain gauges converts an output signal from one of the strain gauges into an equivalent torque value. The tensor beam is intermediate the handle and the wrench head and is rotatably coupled to the wrench head and is rotatable, with respect to the tensor beam, between a first position in which the processor processes an output signal from the first strain gauge and a second position in which the processor processes an output signal from the second strain gauge assembly.

Abstract: A tool, a tool system, and method for applying torque to a hammer union. The tool includes a handle attached to a tool head, and the tool head further includes at least two indentations, the indentations having a curved rearward wall and forming a mouth with a first width and a mid-section with a second width, wherein the mid-section width is greater than the mouth width.

Abstract: A universal ratcheting tool provides improved handling of tools that are difficult to use on their own, specifically, hexagonal wrenches. The universal ratcheting tool includes a handle and a body with a ratcheting mechanism within the handle. The body includes a first aperture for receiving a tool, and the first aperture includes slots to accept a plurality of sizes of tools. The body also includes a second aperture where the tool extends out of the body. A retaining component is coupled with the body to retain the tool and a retaining tab is able to be used to open and close the retaining component. Once the tool is positioned and retained within the universal ratcheting tool, a user is able to easily install or remove an object such as a screw with the benefit of a comfortable handle and the ease of use of the ratcheting mechanism.

Abstract: A tool includes a first bit receiving socket, a second bit receiving socket, and an angled metal structure. The angled metal structure includes a first end connected with the first bit receiving socket and a second end connected with the second bit receiving socket.

Abstract: A ratchet includes multiple ratchet teeth defined in the outer periphery thereof and a coated layer is coated along the outer periphery of the ratchet. A sand blasting device is used to blast sands to remove a part of the coated layer to define a circular endless opening on the coated layer, and the ratchet teeth protrude the coated layer from the openings.

Abstract: A hand tool is disclosed. The hand tool has a gripping portion and a distal end with an attachment end disposed thereon. A ratcheting mechanism is combined with the attachment end to provide ratcheting action. A rotatable head is combined with the attachment end and engaged with the ratcheting mechanism. The rotatable head comprises a plurality of sockets and in some embodiments the rotatable head has four sockets of different size spaced thereon.

Abstract: A screwdriver, including driver bit sleeve, revolving wheel-shaped driver bit holder and pushrod, the revolving wheel-shaped screwdriver bit holder is rotatably arranged at the rear side of the driver bit sleeve, the revolving wheel-shaped driver bit holder is distributed with axial containing hole containing driver bit and the containing hole can be turned to axially coincide with the inner hole of the driver bit sleeve; pushrod is arranged at the rear side of the revolving wheel-shaped driver bit holder and axially coincides with the inner hole of the driver bit sleeve, the inner hole of the driver bit sleeve includes torque transmission segment at the front part and guiding segment at the rear part, the hole wall of the guiding segment is arranged as guiding surface; and it can also include handle, pushbutton set, pushrod which extends into one of containing holes of driver bit holder when pushbutton set is positioned at first positioning portion of the front part of slideway on the handle, pushing the dri

Abstract: A ratchet wrench includes a head having a first compartment rotatably receiving a drive member. A second compartment is defined in an inner periphery of the first compartment and receives first and second pawls. A switch is pivotably mounted in a control groove of the head and controls engagement relations between the first and second pawls and the drive member. A limiting member is connected between the first and second pawls and maintains two closest teeth respectively of first and second toothed sections of the first and second pawls to be in a restraining spacing that is smaller than a jam spacing, preventing the first and second pawls from jamming between the drive member and a wall of the second compartment.

Abstract: A magnetic oil drain plug removal apparatus is provided. After the drain plug has been loosened manually, the ratcheting mechanism, such as a wrench, would clamp or magnetically attach to the drain plug; the clamp or magnetic holder would then be rotated by the user to turn the screw via a thumb-actuated ratchet mechanism. Using the ratcheting mechanism, the user would then remove the drain plug from the oil pan without the risk of spilling oil on himself or herself, or dropping the drain plug into the hot oil that has drained out of the oil pan.

Abstract: An integrated tool system that includes various interchangeable implements and attachments to provide functionality of pliers, wrenches, hammers, ratchets and screwdrivers. Many of the attachments are secured to rectangular jaws at the upper portion of the device. The lower portion of the device includes an ratcheting gear for accepting sockets, socket adaptors, ratchet extensions and so forth. The upper and lower portions are separable to reveal a receiver for hexes that is stored within the handle, thereby facilitating screwdriving and the like.

Abstract: A universal ratcheting tool provides improved handling of tools that are difficult to use on their own, specifically, hexagonal wrenches. The universal ratcheting tool includes a handle and a body with a ratcheting mechanism within the handle. The body includes a first aperture for receiving a tool, and the first aperture includes slots to accept a plurality of sizes of tools. The body also includes a second aperture where the tool extends out of the body. A retaining component is coupled with the body to retain the tool and a retaining tab is able to be used to open and close the retaining component. Once the tool is positioned and retained within the universal ratcheting tool, a user is able to easily install or remove an object such as a screw with the benefit of a comfortable handle and the ease of use of the ratcheting mechanism.

Abstract: A one-way torque tool includes a head, a rotor placed in the head, a number of ratchets formed on the head, two pawls pivotally connected to the rotor and detachably engaged with the ratchets. The ratchets are separated from one another by a first angle ? identical to 360 degrees divided by the number of the ratchets. The pawls are separated from each other by a second angle ? identical to a multiple of the first angle ? plus a third angle ? that is smaller than the first angle ?.

Abstract: A ratchet wrench having easily assembling structure includes a body, a D-head, a loose ratchet, a heart-shaped spring, a disc and a ring. The body has a head portion. The head portion has a through hole. A plurality of teeth is uniformly defined on the through hole. The D-head is rotatably disposed in the through hole and has a connecting member and a threaded member. The loose ratchet is disposed on the D-head. The heart-shaped spring has a closed tip. The disc is disposed on the head portion. A shouldered hole is opened on the disc. A ring is disposed onto the shouldered hole. The ring is disposed onto the shouldered hole. Under this arrangement, a user engages a tool bit with the connecting member of the present invention to lock a bolt by repeatedly rotating the body of the present invention clockwise/counterclockwise.

Abstract: A one-way ratchet wheel element has engaged and linked driving wheel and driven wheel in a body. The side of the body that connects with the driving wheel has a shifting space. A tooth section is provided on a wedge opposite to the shifting space. When the driven wheel rolls and engages with the tooth section, there is a resistance to the rotation of the driving wheel, forming an engagement state. When the driven wheel is away from the tooth section on the wedge, it is in the idle state.

Abstract: A dual-drive self-ratcheting device, that efficiently converts alternating clockwise and counterclockwise rotation applied to its input, into unidirectional rotation at its output, by employing a plurality of means, such as, but, not limited to, ratchet and pawls or roller-type clutch mechanisms, oriented the same and arranged in tandem, on a common drive shaft and caused to alternately drive the shaft continuously in either all clockwise or counterclockwise direction, as oscillatory motion is applied to its input; while the first ratchet and pawl or roller clutch mechanism is caused to impart motion onto a drive-shaft, the second ratchet and pawl or roller clutch mechanism is simultaneously caused to override the driveshaft; while the second ratchet and pawl or roller clutch mechanism is caused to impart motion onto a drive-shaft, the first ratchet and pawl or roller clutch mechanism is simultaneously caused to override the driveshaft; hence regardless of the direction of rotation applied to the input, the

Abstract: The present invention discloses a complex wrench composed of a strip-shaped shank which includes a front section, a middle section and a rear section along its length direction in order thereof, the front section and the rear section connecting a first driving head and a second driving head respectively, the middle section being a twisted section which makes the axis lines of the first driving head and the second driving head on different planes, and the middle section having at least one sunken area where is covered with a plurality of embossed patterns.

Abstract: A ratcheting tool including a handle formed with an integral yoke at a first end and a tool head coupled to the yoke at a pivot. The tool head has a toothed hub facing rearwardly of the pivot and into the yoke. A locking spool is rotatably carried in the yoke adjacent the toothed hub. The locking spool has a first face, a second face, and a first tooth extending along both the first face and the second face and engaging the toothed hub. The locking spool is rotatable between a first position in which the first face is adjacent the toothed hub, thereby locking the tool head in a selected angular position with respect to the handle, and a second position in which the second face is adjacent the toothed hub such that the tool head is pivotable about the pivot.

Abstract: A ratchet comprises a handle, an adjustable socket, and a coupling fixedly coupling the adjustable socket to the handle.

Abstract: A ratchet wrench includes a main body provided at an end portion thereof with an accommodation, a pawl installed in the accommodation, and a ratchet wheel rotatably installed in the accommodation and engaged with the pawl. The main body has a through hole into which a plug is detachably inserted. The through hole of the main body is provided through a surface of the main body and communicated with the accommodation. Removing the plug from the through hole of the main body enables lubricant or cleaner to be poured through the through hole into and out of the accommodation for lubricating or cleaning the internal parts of the ratchet wrench so as to make the ratchet wheel run more smoothly.

Abstract: A dual purpose flip-out and T handle ratchet is able to be used in an L or modified L-handle orientation as well as a T handle orientation. The dual purpose flip-out and T handle includes a handle portion and a ratchet head and neck portion. The handle portion is coupled to the neck portion at a lockable hinge. The hinge allows the head and neck portion to rotate to an L or modified L-handle orientation or to a T handle orientation. When properly oriented the tool is able to be used to tighten or loosen objects such as screws or bolts.

Abstract: A wrench includes a body having a driving head which has a ratchet mechanism having a rotatable ratchet gear. An engaging hole is defined in one side of the ratchet gear and a groove is defined in the inner periphery of the engaging hole. A stop portion extends from the other side of the ratchet gear. A universal connector has a driving part extending from the first end thereof and a head is located on the second end of the universal connector. The head is located within the engaging hole and swingable relative to the axis of the head and non-rotatable relative to the axis of the head. A resilient member is located in the engaging hole and located between the stop portion and the head. A clip is engaged with the groove so as to restrict the universal connector from dropping out from the engaging hole.

Abstract: A composite hand tool comprises a storage handle and a ratchet head. The storage handle includes a connection end and a hinged end. The hinged end is pivotally coupled with a plurality of wrenches. The connection end has a mounting cavity and a plurality of latch grooves formed annularly on the mounting cavity. The ratchet head has a ratchet end formed in a shape mating the mounting cavity and a locking end. The locking end has a plurality of bumps corresponding to the latch grooves. The ratchet end has a strut with an indented coupling cavity formed on the top end thereof. Hence the locking end can be coupled in the mounting cavity to allow the coupling cavity on the ratchet end, and the ratchet end forms a storage state in which anyone of the wrenches can be turned downwards and extended in a usable condition.

Abstract: A ratcheted wrench hand tool comprises a capability of rotationally driving a fastener when the tool's handle is off axis from the center line of the ratchet member. The hand tool comprises at least one gimbal ring to permit deflection of the tool's handle from the central axis line. Even when the handle is deflected from the central axis line, a user can nevertheless tighten or loosen a fastener by rotating the handle.

Abstract: A ratchet wrench includes a driving device having first and second sides spaced along a rotating axis. A compartment extends from the first side through the second side. A drive member is received in the compartment and includes an end for driving a tool. A ledge is formed on an inner periphery of an end of the compartment at the second side. A pressing rod extends into the drive member via the end of the compartment at the second side. The pressing rod is movable relative to the drive member along the rotating axis to control engagement with or detachment from the tool. A dustproof ring is mounted between the ledge and the pressing rod. The dustproof ring includes an outer side and an inner side. The outer side presses against an abutment portion of the ledge. The inner side presses against the pressing rod.

Abstract: A ratchet wrench includes first recess in the function end thereof and a second recess is defined in the inside of the first recess. A ratchet wheel is located in the first recess, and a pawl and a resilient member are located in the second recess. The resilient member is connected between the pawl and the inside of the second recess. The resilient member biases the pawl to be engaged with the ratchet wheel. A C-shaped restriction member is engaged with the first recess and has a rod which is inserted into the second recess. A space is defined between the inside of the first recess and the rod. The second end of the resilient member is located in the space so as to position the resilient member in the second recess.

Abstract: This invention relates to a fastener driving device including a variable ratio gear mechanism that enables the ratio of the rotation of the handle to the rotation of a driving bit extending from the handle to be varied to allow the bit to rotate at different speeds from the handle. The device includes a gear mechanism disposed within a housing for the device that includes a locking member. The locking member can be engaged with the gear mechanism to lock the gear mechanism in a configuration for a 1:1 gear ratio. The locking member can be moved with regard to the gear mechanism to provide an increased gear ratio for the gear mechanism when desired.

Abstract: An insulating ratchet wrench includes a wrench body, a ratchet assembly, a main insulator and a knob. The wrench body is covered with the main insulator. The main insulator has a first insulating ring and a second insulating ring. The first insulating ring has a main annular wall and a sub annular wall. The knob has a main annular groove and a sub annular groove. Under this arrangement, the knob is assembled with the main insulator by the main annular groove and the sub annular groove sleeving onto the main annular wall and the sub annular wall respectively so as to form an overlapping structure between the ratchet assembly and the knob. When a user rotates the knob or holds the wrench body near the ratchet assembly, the main insulator avoids an electric shock in a saltatory conduction manner from a charged object via the ratchet assembly.

Abstract: A detachable ratchet wrench spanner made accordance with the present invention includes a spanner body, a ratchet gear, a retaining collar, and a locking device. The spanner body includes a first surface, a second surface, and a through hole extending from the first surface to the second surface, and an annual recess defined within an inner wall of the through hole. A ratchet gear is rotationally disposed within the through hole. And a retaining collar is attached to a first opening of the through hole located on the first surface. The retaining collar includes a blocking ring and an anchor and a retainer extending from the blocking ring, wherein the blocking ring is located within the through hole, and the anchor is disposed within the annual recess of the spanner body, and the retainer is engaged to the spanner body with a locking device.

Abstract: A ratchet wrench includes a head and a handle. The head is assembled with a switch member and an active mechanism which provides a ratchet function. The switch member is switched to selectively engage the active mechanism, so that the active mechanism may be fixed or be rotatable to achieve the ratchet function. Therefore, the wrench is provided with the function of ratchet which makes the wrench easy to use and with the function of fixing which makes the structure strength of the wrench strengthened. Conveniency of using wrench is improved.

Abstract: A ratchet wrench includes a handle; a wrench head comprising a first cavity and a second cavity communicating therewith; a drive gear and socket combination rotatably disposed in the first cavity and comprising surface teeth; a reversing pawl comprising pawl teeth on one surface, the pawl teeth meshed with the teeth of the drive gear and socket; a pivotal unit pivotably disposed in the second cavity, the pivotal unit urging against the other surface of the reversing pawl and being adapted to reciprocally pivot about the reversing pawl; and a reversing button assembly moveably disposed on the wrench hand and aligned with an axial direction of the handle. The reversing button assembly is adapted to manually move along a straight line to activate the pivotal unit which pivots the reversing pawl so as to permit the drive gear and socket combination to rotate clockwise or counterclockwise.

Abstract: A ratchet wrench includes a driving head, two retaining rings engaged in the driving head, a driving member rotatably engaged in the driving head and having a gear, and a pawl engaged in the driving head and having a lever arm extended from a shaft, and one or more teeth formed on the lever arm for engaging with the gear and for determining the driving direction of the driving member by the driving head and the handle, the shaft includes two end segments extended beyond the lever arm for forming two engaging surfaces and for engaging with the retaining rings and for allowing the retaining rings to apply a spring biasing force onto the end segments of the shaft and to force the teeth of the lever arm to engage with the gear.

Abstract: A ratchet wrench includes a driving head having an internal gear, a driving member rotatably engaged in the driving head, two retaining rings engaged in the driving head, and a pawl engaged in the driving head and having a lever arm extended from a shaft, and one or more teeth formed on the lever arm for engaging with the internal gear and for determining the driving direction of the driving member by the driving head and the handle, the shaft includes two end segments extended beyond the lever arm for forming two engaging surfaces and for engaging with the retaining rings and for allowing the retaining rings to apply a spring biasing force onto the end segments of the shaft and to force the teeth of the lever arm to engage with the internal gear.

Abstract: A ratchet includes multiple ratchet teeth defined in the outer periphery thereof and a coated layer is coated along the outer periphery of the ratchet. A laser device is used to generate a laser beam to remove a part of the coated layer to defined openings in the coated layer and the ratchet teeth protrude from the openings.

Abstract: A driving tool includes a driving head having a catching element formed in a compartment of the driving head, a carrier includes a stem engaged in the driving head and slidable relative to the driving head between a working and engaging position and a releasing position, a latching member is formed on the stem for engaging with the catching element to selectively latch the stem and the carrier to the driving head, and the stem and the carrier are rotatable relative to the driving head when the latching member of the stem is disengaged from the catching element of the driving head and when the stem and the carrier are positioned to the driving head at the releasing position.

Abstract: A ratchet wrench includes a wrench body, a ratchet rotatably mounted in the wrench body and defining therein a through hole for accommodating a screw nut, a magnetic member mounted in the through hole, and one or multiple limiters mounted in the through hole of the ratchet to hold the magnetic member in place. Thus, the opposing ends of the ratchet can be selectively used to accommodate a mating screw nut and the accommodated screw nut can be secured in place inside the ratchet by the magnetic attractive force of the magnetic member, avoiding screw nut displacement or falling and facilitating the use of the ratchet wrench. Further, the ratchet can be configured to have a stepped through hole for selectively accommodating different sizes of screw nuts.

Abstract: A ratchet wrench includes a wrench body and a ratchet rotatably mounted in a ratchet hole of the wrench body and provided with one end protruding out of the ratchet hole for connection of a driving wheel. Thus, a user can rotate the driving wheel to force the rotation of the ratchet, such that a screw nut accommodated in the ratchet can be secured or loosened quickly and conveniently.

Abstract: A dual purpose flip-out and T handle ratchet is able to be used in an L or modified L-handle orientation as well as a T handle orientation. The dual purpose flip-out and T handle includes a handle portion and a ratchet head and neck portion. The handle portion is coupled to the neck portion at a lockable hinge. The hinge allows the head and neck portion to rotate to an L or modified L-handle orientation or to a T handle orientation. When properly oriented the tool is able to be used to tighten or loosen objects such as screws or bolts.

Abstract: A ratchet wrench includes a reception hole defined through the function end of the wrench and a recess is defined in the inner periphery of the reception hole. A ratchet wheel is rotatably located in the reception hole. A pawl, a restriction member and a resilient member are received in the recess. The two ends of the resilient member respectively contact the pawl and the restriction member to bias the pawl to be engaged with the ratchet wheel. A restriction ring is located in the reception hole and has a rod extending therefrom, the rod extends into the recess. The restriction member is located between the rod and the inner periphery of the recess.