Abstract: A switch device includes a shell, a ratchet wheel, a first pawl member, a second pawl member, a first biasing member, a second biasing member, a switch shaft, and a stop member. The shafting shaft is disposed to turnably engage a central segment of the stop member. Two lateral segments of the stop member are disposed respectively above the first and second pawl members, and respectively have two abutment edges that are disposed opposite to the ratchet wheel, and that are configured to be brought into abutting engagement with a surrounding wall of the shell so as to prevent the switch shaft from pulling out of the shell. A ratchet wrench having the switch device is also disclosed.

Abstract: A switch device includes a shell, a ratchet wheel, a first pawl member, a second pawl member, a first biasing member, a second biasing member, a switch shaft, and a stop member. The shafting shaft is disposed to turnably engage a central segment of the stop member. Two lateral segments of the stop member are disposed respectively above the first and second pawl members, and respectively have two abutment edges that are disposed opposite to the ratchet wheel, and that are configured to be brought into abutting engagement with a surrounding wall of the shell so as to prevent the switch shaft from pulling out of the shell. A ratchet wrench having the switch device is also disclosed.

Abstract: A ratchet wrench includes a head shell, a handle, a ratchet wheel, a driving member, a first pawl member, a second pawl member, a first biasing member, a second biasing member, a cam member, an actuating finger, and a limiting member. The limiting member including a key slot formed in one of the actuating finger and an upper major wall of the head shell, and a key which is slidably engaged in the key slot, and which is formed in the other one of the actuating finger and the upper major wall of the head shell so as to restrict angular movement of the actuating finger.

Abstract: A metric and English socket wrench is rotatable about an axis, and includes an inner peripheral surface. The inner peripheral surface has first engaging portions, and second engaging portions arranged alternately with the first engaging portions. Each of the first engaging portions has two first engaging surfaces interconnected to form a V-shape. A first apex is disposed between the two first engaging surfaces, and is spaced apart from the axis by a first distance. Each of the second engaging portions has two second engaging surfaces interconnected to form a V-shape. A second apex is disposed between the two second engaging surface, and is spaced apart from the axis by a second distance. Ratio of the first distance to the second distance is more than 0.94 and less than 1.06.

Abstract: A clutch includes a drive body disposed in a hollow base and having a plurality of force-bearing surfaces each cooperating with the hollow base to define an accommodating space therebetween. A clutching component is received in the accommodating space, and abuts against the hollow base and the force-bearing surface at first and second contact points, respectively. An angle between two lines, passing respectively through the first and second contact points and intersecting at a center of the clutching component, is greater than 160° and smaller than 180°. A ratio of a maximum distance between the inner annular surface and the force-bearing surface to a cross-sectional dimension of the clutching component is greater than 1 and smaller than 1.1.