Abstract: An elastic short-pin type universal joint includes a first base, a second base, a jointer, a first elastic member, two second elastic members, and four short pins. The first base engages the second base to form a space therebetween. The jointer is received in the space between the first and the second bases. The jointer has a first bore passing through the jointer, a second bore, and a third bore. The first elastic member is received in the first bore of the jointer, and the second elastic members are received in the second bore and the third bore. The short pins are urged by ends of the first elastic member and the second elastic members to press the first base and the second base respectively. As a result, the first base is able to rotate related to the second base in all directions.

Abstract: An elastic short-pin type universal joint includes a first base, a second base, a jointer, a first elastic member, two second elastic members, and four short pins. The first base engages the second base to form a space therebetween. The jointer is received in the space between the first and the second bases. The jointer has a first bore passing through the jointer, a second bore, and a third bore. The first elastic member is received in the first bore of the jointer, and the second elastic members are received in the second bore and the third bore. The short pins are urged by ends of the first elastic member and the second elastic members to press the first base and the second base respectively. As a result, the first base is able to rotate related to the second base in all directions.

Abstract: An elastic short-pin type universal joint includes a first base, a second base, a jointer, a first elastic member, two second elastic members, and four short pins. The first base engages the second base to form a space therebetween. The jointer is received in the space between the first and the second bases. The jointer has a first bore passing through the jointer, a second bore, and a third bore. The first elastic member is received in the first bore of the jointer, and the second elastic members are received in the second bore and the third bore. The short pins are urged by ends of the first elastic member and the second elastic members to press the first base and the second base respectively. As a result, the first base is able to rotate related to the second base in all directions.

Abstract: An elastic short-pin type universal joint includes a first base, a second base, a jointer, a first elastic member, two second elastic members, and four short pins. The first base engages the second base to form a space therebetween. The jointer is received in the space between the first and the second bases. The jointer has a first bore passing through the jointer, a second bore, and a third bore. The first elastic member is received in the first bore of the jointer, and the second elastic members are received in the second bore and the third bore. The short pins are urged by ends of the first elastic member and the second elastic members to press the first base and the second base respectively. As a result, the first base is able to rotate related to the second base in all directions.

Abstract: A ball type universal joint includes a coupling member and a socket member combined together. The socket member has a ball head and lugs projectingly formed on a surface of the ball head. A surface between two neighboring lugs is a spherical surface. The coupling member has a cylindrical coupling hole. Ribs are projectingly formed on a wall surface of the cylindrical coupling hole. One side of each rib is a protrusion surface, and a lengthwise extending direction of the protrusion surface is an extending direction of a straight line. The ball head is coupled to the cylindrical coupling hole. Each lug is disposed between two ribs. Each rib is disposed between two lugs and corresponds to the spherical surface. A combination of the coupling member and the socket member may be adjusted into an angled state. The spherical surface is tangent to a protrusion surface of the rib.

Abstract: An elastic short-pin type universal joint comprises a first base, a second base and a connection member. The connection member has a first hole, a second hole, a third hole and a fourth hole each being disposed at the same level from the connection member. Wall surfaces of the first base and the second base have slots corresponding to the holes, respectively. An elastic assembly is disposed in each hole, and one end of each elastic assembly rests against one slot. Thus, the length of the connection member can be shortened, and the length or size of the universal joint can be reduced. In addition, each elastic assembly can be easily and rapidly installed.

Abstract: A ratchet wrench includes a wrench body, a ratchet wheel, and a drive device. The drive device includes a pawl member, a drive block, and a control button. Thus, the insert of the pawl member is inserted into the slot of the drive block so that the pawl member and the drive block are combined integrally, and the pawl member is limited in the head portion of the wrench body, so that the pawl member and the drive block are retained by the head portion of the wrench body to prevent the drive block and the control button from being detached from the head portion of the wrench body by the push force of the first elastic unit.

Abstract: An enclosed wrench has a drive head defined at an end provided with an opening therein, on the internal surface of the opening a plurality of uniform drive protrusions being disposed respectively and each of which is isosceles triangle structure, the sidelines of each adjacent pair of drive protrusion are crossed. A vertex of each drive protrusion is identical with that of a vertex of the respective isosceles triangle. The height of the isosceles triangle is equal to the sum of the absolute value of the international tolerance of the wrench and that of the corresponding working piece to be driven.

Abstract: An enclosed wrench has a drive head defined at an end provided with an opening therein, on the internal surface of the opening a plurality of uniform drive protrusions being disposed respectively and each of which is isosceles triangle structure, the sidelines of each adjacent pair of drive protrusion are crossed. A vertex of each drive protrusion is identical with that of a vertex of the respective isosceles triangle. The height of the isosceles triangle is equal to the sum of the absolute value of the international tolerance of the wrench and that of the corresponding working piece to be driven.