Abstract: A tool joint is provided, including a main body, a swingable member and a locking structure. The main body has a connecting channel. The swingable member is disposed on the main body. A driving rod is disposed through the swingable member and movable between a first position and a second position. When the driving rod is in the first position, the driving rod is out of the connecting channel, the swingable member is swingable relative to the main body. When the driving rod is in the second position, the driving rod projects within the connecting channel and the swingable member is non-swingable relative to the main body.

Abstract: A multi-section universal tool includes an assembling member, a connecting member, a working member and two elastic members. The assembling member has an assembling portion and a first receiving room. The connecting member includes a connecting ball joint and a second receiving room. The connecting ball joint includes a connecting elastic abutting member which has a tendency to radially move outwardly. The connecting ball joint is inserted into the first receiving room and movable relative to the first receiving room to be in a first connecting position or a second connecting position. The working member includes a working ball joint including a working elastic abutting member which has a tendency to radially move outwardly. The working ball joint is inserted into the second receiving room and movable relative to the second receiving room to be in a first working position or a second working position.

Abstract: A two-stage universal joint includes a sleeve, a driving member and a restricting member. The sleeve defines an axial direction and includes a receiving groove and an assembling portion. The driving member includes a polygonal ball head. The polygonal ball head has a plurality of arcuate portions. The polygonal ball head is inserted into the receiving groove. The driving member is slidable between a first position and a second position relative to the sleeve.

Abstract: A two-stage universal joint includes a sleeve member, a driving member, and an elastic member. The sleeve member defines an axial direction and has a sleeve portion and a connection portion. The sleeve portion has a receiving groove having plural positioning protrusions extending axially on an inner wall thereof. One of the positioning protrusions has a recessed portion. The driving portion has a polygonal ball-joint having plural arc-face sections. The polygonal ball-joint is inserted into the receiving groove. The driving member is slidable with respect to the sleeve member between a first position and a second position. The polygonal ball-joint has a biasing member tending to move outward.

Abstract: A driving head-changeable tool includes an outer sleeve, an inner sleeve and a limitation mechanism. The outer sleeve defines a central axis and has an end peripheral edge having corner portions and blocking flanges therebetween and a circumferential sliding slot. The inner sleeve is rotatably sleeved by the outer sleeve and has first and second connecting ends. The first connecting end has axial concaves. The limitation mechanism is mounted to the inner sleeve and extends into and movable relative to the sliding slot. When the limitation mechanism is located in a lock position, the outer and inner sleeves are unrotatable relative to each other and each concave overlaps axially with one of the blocking flanges; when the limitation mechanism is located in a release position, the outer and inner sleeves are rotatable relative to each other and each concave corresponds to one of the corner portions.

Abstract: A driving tool is provided, including a tool set and a driving head. The tool set includes a connecting sleeve, an outer sleeve and at least one limitation member. The connecting sleeve has a receiving slot and a driving end. A plurality of protruding ribs extending axially and a plurality of recesses disposed between the protruding ribs are disposed on an inner wall of the receiving slot. The recesses are provided for a polygonal ball head to insert therein. A recessed portion and a protruding portion are disposed on the inner wall. The outer sleeve is slidable between a first position and a second position. When the outer sleeve is at the first position, the limitation member can restrict the polygonal ball head. When the outer sleeve is at the second position, the polygonal ball head is withdrawable from the receiving slot.

Abstract: A driving head-changeable tool is provided, comprising an outer sleeve and an inner sleeve. The outer sleeve has an end peripheral edge and a non-circular circumferential inner wall. The end peripheral edge is formed with corner portions and blocking flanges. The inner sleeve has a non-circular circumferential outer wall. The inner sleeve is rotatably sleeved by the outer sleeve and has a first connecting end along a central axis. An inner wall of the first connecting end is formed with concaves extending axially. The non-circular circumferential inner and outer walls are nonrotatably abutted against each other. As viewed in an axial direction, each concave overlaps with one the blocking flange. When a driving head is inserted in the inner sleeve and the outer sleeve and the inner sleeve come close to each other, the driving head is blocked by the blocking flanges.

Abstract: A driving head-changeable tool is provided. An outer sleeve defines a central axis and has an end peripheral edge which has corner portions and blocking flanges therebetween and a circumferential sliding slot. An inner sleeve is rotatably sleeved by the outer sleeve and has opposite first and second connecting ends. An inner wall of the first connecting end has axial concaves. A limitation mechanism is mounted to the inner sleeve and extends into and movable relative to the sliding slot. As viewed in an axial direction, when the limitation mechanism is located in a lock position, the outer and inner sleeves are unrotatable relative to each other and each concave overlaps with one the blocking flange; when the limitation mechanism is located in a release position, the outer and inner sleeves are rotatable relative to each other and each concave corresponds to one the corner portion.

Abstract: A universal joint composed of a swivel member, a driven socket, and at least one mediator. The swivel member includes a swivel body and a first driving portion. The driven socket includes a concavity, a second driving portion, and an annular recess formed at the concavity. A retaining ring is mounted in the annular recess. The swivel body is received in the concavity. The swivel body includes at least one cavity formed on a surface thereof. The driven socket includes at least one recession, which can correspond to the at least one cavity when the swivel body is located in the concavity. The at least one mediator interacts with the recession and the cavity and is located between the swivel body and the driven socket. Therefore, the operation of the universal joint can be smooth.

Abstract: A universal joint composed of a swivel member, a driven socket, and at least one mediator. The swivel member includes a swivel body and a first driving portion. The driven socket includes a concavity, a second driving portion, and an annular recess formed at the concavity. A retaining ring is mounted in the annular recess. The swivel body is received in the concavity. The swivel body includes at least one cavity formed on a surface thereof. The driven socket includes at least one recession, which can correspond to the at least one cavity when the swivel body is located in the concavity. The at least one mediator interacts with the recession and the cavity and is located between the swivel body and the driven socket. Therefore, the operation of the universal joint can be smooth.