Abstract: A pair of plumbing pliers includes two levers, a pawl and a torque spring. After adjusting the desired bite size according to a diameter of a pipe, the levers are pivoted relative to each other in a first range to clamp and release the pipe repeatedly to rotate the pipe. To adjust a bite size of the pair of plumbing pliers according to a diameter of another pipe, the levers are pivoted and then moved relative to each other in a second range. Little resistance is encountered in the first range. However, considerable resistance is encountered in the second range. Hence, the difference between the first and second ranges can easily be felt. Accordingly, it is not likely that a user will, by mistake, enter the second range, i.e., increase the bite size of the pair of plumbing pliers.

Abstract: A pair of plumbing pliers includes two levers, a pawl and a torque spring. After adjusting the desired bite size according to a diameter of a pipe, the levers are pivoted relative to each other in a first range to clamp and release the pipe repeatedly to rotate the pipe. To adjust a bite size of the pair of plumbing pliers according to a diameter of another pipe, the levers are pivoted and then moved relative to each other in a second range. Little resistance is encountered in the first range. However, considerable resistance is encountered in the second range. Hence, the difference between the first and second ranges can easily be felt. Accordingly, it is not likely that a user will, by mistake, enter the second range, i.e., increase the bite size of the pair of plumbing pliers.

Abstract: A method of social key recovery for a first communication device supporting blockchain technology with asymmetric cryptographic algorithm is disclosed. The method comprises transmitting a device identity of the first communication to a second communication on the blockchain, performing a verification operation with the second communication device, receiving a message including a verification code of the first communication device and a public key of the second communication device, from the second communication device, wherein the first message is encrypted with a public key of the first communication device, decrypting the message with a private key of the first communication device, to obtain the public key of the second communication device, and transmitting seed phrases encrypted with the public key of the second communication device for restoring a crypto wallet on the blockchain, to the second communication device.

Abstract: A method of social key recovery for a first communication device supporting blockchain technology with asymmetric cryptographic algorithm is disclosed. The method comprises transmitting a device identity of the first communication to a second communication on the blockchain, performing a verification operation with the second communication device, receiving a message including a verification code of the first communication device and a public key of the second communication device, from the second communication device, wherein the first message is encrypted with a public key of the first communication device, decrypting the message with a private key of the first communication device, to obtain the public key of the second communication device, and transmitting seed phrases encrypted with the public key of the second communication device for restoring a crypto wallet on the blockchain, to the second communication device.

Abstract: A cutter includes two handles, two jaws, two strips and two pins. The first jaw extends from the first handle in a co-planar manner and includes a boss and a blade with a cutting edge. The second jaw extends from the second handle in a co-planar manner and includes a groove for movably receiving the boss and a blade with a cutting edge. The strips sandwich the first and second jaws. Each of the pins is inserted in the strips and a corresponding one of the first and second jaws in perpendicular. An acute angle is defined between an equidistant line of the cutting edges and an equidistant line of axes of the pins.

Abstract: A transformer includes a magnetic core assembly and a hollow pad. The magnetic core assembly includes a first magnetic part and a second magnetic part. Each of the first magnetic part and the second magnetic part includes a middle post. The hollow pad is arranged between the middle post of the first magnetic part and the middle post of the second magnetic part. The hollow pad has an opening for accommodating a gluing material. The first magnetic part and the second magnetic part are combined together through the gluing material.

Abstract: A transformer includes a bobbin, a magnetic core assembly, and a hollow pad. The bobbin includes a main body and a channel. The channel runs through the main body. The magnetic core assembly includes a first magnetic part and a second magnetic part. Each of the first magnetic part and the second magnetic part includes a middle post. The middle post is partially inserted into the channel. The hollow pad is arranged between the middle post of the first magnetic part and the middle post of the second magnetic part. The hollow pad has an opening for accommodating a gluing material. The first magnetic part and the second magnetic part are combined together through the gluing material.

Abstract: A well coated wrench includes a metal element, a one-way mechanism and an isolative coating. The metal element includes a tunnel defined therein. The one-way mechanism is substantially located in the tunnel. The one-way mechanism includes a tongue located outside the tunnel and a button located outside the tunnel. The isolative coating is provided on the metal element. The isolative coating includes an external annular ridge located around the button.

Abstract: An insulated ratchet wrench comprising a body and an insulated coat coated with an outer periphery of the body. The body is divided into a head and a handle and a through hole is defined in the head for mounting a ratchet device. The ratchet device includes a polygonal stub extending therefrom and passing through the insulated coat for connecting to a workpiece. An actuator extends through the insulated coat and the through hole for partially and moved received in the polygonal stub. The insulated coat includes an enlarged portion for coating the head. A recess is defined in the enlarged portion for movably receiving the actuator and a through hole is defined in a bottom of the recess to allow the actuator extending through the insulated coat.

Abstract: A well coated wrench includes a metal element, a one-way mechanism and an isolative coating. The metal element includes a tunnel defined therein. The one-way mechanism is substantially located in the tunnel. The one-way mechanism includes a tongue located outside the tunnel and a button located outside the tunnel. The isolative coating is provided on the metal element. The isolative coating includes an external annular ridge located around the button.

Abstract: A socket wrench includes a housing disposed in a driving head and having one or more protruded portions and one or more recessed portions, a gear rotatably received in the housing and having a driving stem, a detent slidably received in the driving stem and extendible into and out of the driving stem, a shaft slidably and rotatably received in the gear and having an actuating end for engaging with the detent, a follower attached to the shaft and having one or more protruded portions and one or more recessed portions for engaging with the protruded portions and the recessed portions of the housing and for actuating the actuating end of the shaft to engage with or to be disengaged from the detent.

Abstract: A socket wrench includes a housing disposed in a driving head and having one or more protruded portions and one or more recessed portions, a gear rotatably received in the housing and having a driving stem, a detent slidably received in the driving stem and extendible into and out of the driving stem, a shaft slidably and rotatably received in the gear and having an actuating end for engaging with the detent, a follower attached to the shaft and having one or more protruded portions and one or more recessed portions for engaging with the protruded portions and the recessed portions of the housing and for actuating the actuating end of the shaft to engage with or to be disengaged from the detent.

Abstract: A plier device includes two elongated handle member each having an intermediate neck portion formed between a jaw and a handle, an elongated channel and a number of teeth are formed in one of the handle members, and an orifice is formed in the other handle member for pivotally engaging a shaft of a pawl member which includes one or more teeth for engaging with the teeth of the handle member. A spring member is attached to one of the handle members and has a leg engaged with the pawl member and the other leg engaged with the handle member for biasing the tooth of the pawl member to engage with the teeth of the handle member. A frame may solidly anchor the pawl member to the handle members.

Abstract: An air pump includes a housing having a top formed with a circular recess, a first semi-cylindrical member in communication with the circular recess, and a first curved baffle arranged close to the first semi-cylindrical member, an electric motor mounted within the housing and having an output axle extending upwardly out of the center through hole, a bottom cover engaged with a bottom of the housing by retainers, a centrifugal impeller eccentrically fitted in the circular recess so that there is a circular passage between the centrifugal impeller and an inner wall of the circular recess, an upper cover configured to engage with the circular recess to cover the centrifugal impeller and having a conical portion disposed above the centrifugal impeller thereby forming a passage therebetween, whereby the air pump can provide sufficient air pressure to inflate an object in a short time.