Patent ID: 9381623
Filing Date: 2016-07-05
CPC Classification: B21K,B25B,B25G

Claim Text:
1. An open wrench comprising: at least two identical heads, each head having two jaws extending from a first end thereof and a handle extending from a second end of the head, a first recess defined between the two jaws, one of the two jaws having a recessed section defined in an inside thereof, the other one of the two jaws having a convex contact face formed on an inside thereof, an inclined face extending from the contact face and toward the distal end of the jaw corresponding thereto, the inclined face extending away from an axis of the handle, a second recess defined between the two jaws and having a first curved face, the handle having a first connection portion which is a hole, each head having multiple second connection portions which are holes; a pawl movably located in the second recess and having a recessed area defined in a front side thereof, and a second curved face defined in a rear end of the pawl, a first engaging portion and a second engaging portion respectively extending from two ends of the recessed area, the first and second engaging portions respectively protruding into the first recess, the second curved face and the first curved face having the same radius and being in contact with each other, the pawl having a reception slot and a curved slot which is defined through a top and a bottom of the pawl, the reception slot communicating with the curved slot, the second curved face and the curved slot sharing a first center which is located within the first recess; a resilient member located in the reception slot; at least two identical covers respectively connected to a top and a bottom of the at least two heads overlapped to each other so as to seal the pawl and the resilient member to the at least two heads, each cover having a hole which is located within the second recess and located corresponding to the curved slot, each cover having multiple third connection portions which are holes and located corresponding to the second connection portions; a pin extending through the holes of the at least two covers and the curved slot, the pin contacting one end of the resilient member and one of two inner ends of the curved slot, the pawl being restricted by the pin and being not dropping from the second recess, when the pawl moves along the first curved face, the pin moves along the curved slot; a first connection member extending the first connection portions and connecting the at least two heads together; multiple second connection members extending through the second connection portions and the third connection portions to connect the at least two covers to the at least two heads; when an object with six sides is located in the first recess, a diameter of the first curved face is equal to or smaller than a width of two facing sides of the object, the contact face is tangent to one side of the object, the first and second engaging portions contact two adjacent sides of the object at a first intersection point and a second intersection point, the recessed area receives one of six corners of the object, a maximum distance between the recessed section and the contact face is longer than a maximum diagonal line of the object, the first and second intersection points are projected on the maximum diagonal line of the object to form a first distance, a second distance is defined from a point that the second intersection point is projected on the maximum diagonal line of the object to an axis of the object, the first distance is longer than the second distance.