Abstract: A wrench includes a handle, a clutch, a detent, a controller, a gear and a C-ring. The handle includes an annular head defining a circular space, a pothole not overlapping the circular space, a channel for communicating the circular space with the pothole, a recess and an annular groove both defined in a wall of the circular space. The clutch includes two claws put in the recess and a spring put between the claws. Each of the claws includes a toothed face and a rod. The claws can easily be put into the recess since the rods can be moved through the channel. A controller is put rotationally in the pothole for moving the rods. The gear is put in the circular space. The gear includes a toothed face for engagement with the toothed face of one of the claws. The C-ring includes an external edge put in the annular groove, an internal edge for retaining the annular gear in the circular space and a gate projecting from an upper face for blocking the channel.

Abstract: A selective one-way wrench includes a head, a spring-biased detent, a pawl, a gear, a transmission element and a switch. The head defines a circular space with a reduced open end, a crescent space communicating with the circular space and a hole communicating with the crescent space. The transmission element includes a protrusion formed on a lower face thereof and a cutout. The transmission element is located in the circular space while the cutout is exposed to the exterior through the reduced open end of the circular space. The spring-biased detent is located in the hole. The pawl includes a plurality of teeth, a groove and a recess. The gear is located in the circular space and the teeth engage the pawl.

Abstract: A selective one-way wrench includes a head, a spring-biased detent, a pawl, a gear, a transmission element and a switch. The head defines a circular space with a reduced open end, a crescent space communicated with the circular space and a hole communicated with the crescent space. The transmission element includes a protrusion formed on a lower face thereof and a cutout defined therein. The transmission element is put in the circular space while the cutout is exposed to the exterior through the reduced open end of the circular space. The spring-biased detent is put in the hole. The pawl includes a plurality of teeth formed on a first side thereof, a groove defined in an opposite second side thereof and a recess defined in an upper face thereof near the first side thereof. The pawl is put in the crescent space so that the spring-biased detent is trapped in selective one of two ends of the groove and that the protrusion is put in the recess. The gear includes a plurality of teeth formed on a periphery thereof.

Abstract: A one-way wrench includes a head, biasing means, a pawl and a gear. The head defines a circular space, a crescent space communicated with the circular space and a hole communicated with the crescent space. The biasing means includes a first spring and a weaker and longer second spring. The springs both include a first end put in the hole and a second end put in the crescent space. The pawl is movably put in the crescent space and includes an end abutted against the second end of the second spring and a toothed side. The gear is rotationally put in the circular space and includes a toothed periphery for engagement with the toothed side of the pawl.

Abstract: A one-way wrench includes a head, biasing means, a pawl and a gear. The head defines a circular space, a crescent space communicated with the circular space and a hole communicated with the crescent space. The biasing means includes a first spring and a weaker and longer second spring. The springs both include a first end put in the hole and a second end put in the crescent space. The pawl is movably put in the crescent space and includes an end abutted against the second end of the second spring and a toothed side. The gear is rotationally put in the circular space and includes a toothed periphery for engagement with the toothed side of the pawl.

Abstract: An anti-gridlock wrench includes a handle, a clutch, a detent, a controller, a gear and a C-ring. The handle includes an annular head defining a circular space, a pothole not overlapping the circular space, a channel for communicating the circular space with the pothole, a recess and an annular groove both defined in a wall of the circular space. The clutch includes two claws put in the recess and a spring put between the claws. Each of the claws includes a toothed face, a first rod and a second rod. The claws can easily enter the recess since the first rods can move through the channel. A controller is put rotationally in the pothole for moving the rods. The gear is put in the circular space. The gear includes a toothed face for engagement with the toothed face of one of the claws. The second rods of the claws can impinge each other in order to push one of the claws from the annular gear.

Abstract: A wrench includes a handle, a clutch, a detent, a controller, a gear and a C-ring. The handle includes an annular head defining a circular space, a pothole not overlapping the circular space, a channel for communicating the circular space with the pothole, a recess and an annular groove both defined in a wall of the circular space. The clutch includes two claws put in the recess and a spring put between the claws. Each of the claws includes a toothed face and a rod. The claws can easily be put into the recess since the rods can be moved through the channel. A controller is put rotationally in the pothole for moving the rods. The gear is put in the circular space. The gear includes a toothed face for engagement with the toothed face of one of the claws. The C-ring includes an external edge put in the annular groove, an internal edge for retaining the annular gear in the circular space and a gate projecting from an upper face for blocking the channel.

Abstract: A wrench includes a head and a handle extending from the head in a direction. The head includes two jaws extending from the head in an opposite direction and a throat formed between the jaws. Each of the jaws includes a contact surface for contact with a facet of a head of a bolt. The contact surface of at least one of the jaws includes a plurality of teeth. The throat defines a central recess for receiving a corner of the head of the bolt. The head may define a recess between the throat and each of the jaws. The throat may include two flat contact surfaces for contact with two adjacent facets of the head of the bolt. The central recess defined in the throat is positioned between the flat contact surfaces of the throat.

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.

Abstract: A wrench includes a head and a handle. The head includes a first jaw formed thereon, a second jaw formed thereon and a throat formed between the first and second jaws. The first jaw includes a first number of teeth. The second jaw includes a second number of teeth. The first number is greater than the second number. The handle extends from the head. The teeth of the first jaw are smaller than that of the second jaw.

Abstract: A wrench includes a head and a handle extending from the head in a direction. The head includes two jaws extending from the head in an opposite direction and a throat formed between the jaws. Each of the jaws includes a contact surface for contact with a facet of a head of a bolt. The contact surface of at least one of the jaws includes a plurality of teeth. The throat defines a central recess for receiving a corner of the head of the bolt. The head may define a recess between the throat and each of the jaws. The throat may include two flat contact surfaces for contact with two adjacent facets of the head of the bolt. The central recess defined in the throat is positioned between the flat contact surfaces of the throat.

Abstract: A quick-release wrench capable of driving two different bolts includes a head and a handle extending from the head. The head includes first and second jaws. The first jaw includes a plate for contact with a head of a bolt and defines a space. The plate defines a hole in communication with the space. An engagement device includes first and second teeth projecting from a slide and a spring. The first tooth is shorter than the second tooth. The first tooth includes a top and a slope extending from the top. Similarly, the second tooth includes a top and a slope. The top of the first tooth is smaller than the top of the second tooth. The engagement device is received in the space so that the first and second teeth extend through the hole and that the slide is biased by the spring.

Abstract: An adaptor comprises a housing, a body, a pawl, and a switch member. The housing includes an end for engaging with a socket. The body includes a first end to be engaged in a box end of a wrench and a second end received in a compartment defined in the other end of the housing. A pawl is pivotally mounted in a transverse groove in the body and includes two toothed sides. A switch member includes a first end for manual operation and a second end engaged with the pawl. The switch member is pivotable between two positions corresponding to two opposite ratcheting directions to selectively urge an associated one of the toothed sides of the pawl to engage with the toothed inner periphery of the housing.

Abstract: A socket wrench includes a group of spanners and a joint. Each of the spanners includes an elongated body, an annular head, a driving element received in the annular head and a ratchet mechanism arranged between the annular head and the driving element in order to selectively provide a one-way rotation of the driving element while the spanner is swayed. The driving element defines a joint-engaging hole. The joint includes integrated spanner-engaging sections and socket-engaging section. Each of the spanner-engaging sections includes a size conforming to that of one of holes. The socket-engaging section includes a shape and size corresponding to that of a socket. Thus, each of the spanner-engaging sections can be engaged with the joint-engaging hole defined in a corresponding one of the spanners. Moreover, the socket wrench includes a bolt-engaging hole defined in a furthest one of the spanner-engaging sections from the socket-engaging section so as to engage with a head of a bolt.

Abstract: A socket wrench includes a spanner and a joint. The spanner includes an elongated body, an annular head, a driving element received in the annular head and a ratchet mechanism arranged between the annular head and the driving element. Thus, a one-way rotation of the driving element can be selectively provided while the spanner is swayed. The driving element defines a hole. The joint includes a middle section, a first terminal section and a second terminal section including a size different from that of the first terminal section. The middle section is used for insertion in the hole, the first terminal section is used for engagement with a socket of a first series while the second terminal section being used for engagement with a socket of a second series.

Abstract: An adaptor comprises a housing, a body, a pawl, and a switch member. The housing includes an end for engaging with a socket. The body includes a first end to be engaged in a box end of a wrench and a second end received in a compartment defined in the other end of the housing. A pawl is pivotally mounted in a transverse groove in the body and includes two toothed sides. A switch member includes a first end for manual operation and a second end engaged with the pawl. The switch member is pivotable between two positions corresponding to two opposite ratcheting directions to selectively urge an associated one of the toothed sides of the pawl to engage with the toothed inner periphery of the housing.

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.

Abstract: A ratchet tool test device includes a board having a hole and a recess which has a toothed inner periphery and shares a common axis with the hole. A pawl member has a shank rotatably extending through the hole and a plurality of extensions extend from the shank. Each of the extensions has teeth which are engaged with the toothed inner periphery. An engaging section is securely connected to the shank so as to be cooperated with a ratchet tool. When the ratchet tool is rotated, the teeth are moved over the toothed inner periphery in one direction.

Abstract: A wrench includes a handle, a clutch, a detent, a controller, a gear and a C-ring. The handle includes an annular head defining a circular space, a pothole not overlapping the circular space, a channel for communicating the circular space with the pothole, a recess and an annular groove both defined in a wall of the circular space. The clutch includes two claws put in the recess and a spring put between the claws. Each of the claws includes a toothed face and a rod. The claws can easily be put into the recess since the rods can be moved through the channel. A controller is put rotationally in the pothole for moving the rods. The gear is put in the circular space. The gear includes a toothed face for engagement with the toothed face of one of the claws. The C-ring includes an external edge put in the annular groove, an internal edge for retaining the annular gear in the circular space and a gate projecting from an upper face for blocking the channel.