초록 ▼

A ratchet wrench includes a first room, a second room, an engaging portion, a third room and a first groove in the function end thereof. Multiple ratchet wheels are received in the third room and one of which is rotatably received in the first room. Each ratchet wheel includes a first pivotal portio

A ratchet wrench includes a first room, a second room, an engaging portion, a third room and a first groove in the function end thereof. Multiple ratchet wheels are received in the third room and one of which is rotatably received in the first room. Each ratchet wheel includes a first pivotal portion, a second pivotal portion and a first toothed portion which is defined in a curved and concaved manner in the outer periphery of the ratchet wheel. A pawl is located in the second room and has a second toothed portion which is engaged with the first toothed portion of the ratchet wheel. The distance defined between the deepest point of the first toothed portion to the first pivotal portion or the second pivotal portion is larger than the distance that the ratchet wheel shifts relative to the pawl within the first room.

대표청구항 ▼

1. A ratchet wrench comprising: a function end and a handle, the function end having a circular first room defined through a top and a bottom thereof, a second room defined in an inner periphery of the first room and communicating with the top and the bottom of the function end, the second room incl

1. A ratchet wrench comprising: a function end and a handle, the function end having a circular first room defined through a top and a bottom thereof, a second room defined in an inner periphery of the first room and communicating with the top and the bottom of the function end, the second room including a first face and a second face which is parallel to the first face, a curved third face connected between the first face and the inner periphery of the first room, a minimum width defined at a conjunction area between the first and second rooms, the second room having a first contact portion formed at an inner end thereof, the first contact portion located on the same side as the first face, the second room having an engaging portion defined at the inner end thereof which is located close to the first contact portion, a thickness between the top and the bottom corresponding to the first room of the function end being thicker than a thickness of the engaging portion, a thickness of the engaging portion being thinner than that of the second room, an angle defined between the first face and an axial axis of the handle passing through a center of the first room, the angle being in a range between 20 to 60 degrees, the handle having a third room, a first groove defined in the inner periphery of the first room and located close to one of the top and bottom of the function end;multiple ratchet wheels received in the third room and one of the ratchet wheels rotatably received in the first room, each ratchet wheel having a first mounting portion which is a polygonal hole or a rectangular protrusion, the first mounting portions of the multiple ratchet wheels being different, each ratchet wheel having a first pivotal portion formed on an upper periphery thereof, each ratchet wheel having a second pivotal portion formed on a lower portion thereof, a first toothed portion defined in an outer periphery of each of the ratchet wheels and located between the first and second pivotal portions corresponding thereto, the first and second pivotal portions of each ratchet wheel rotatably engaged with the inner periphery of the first room, the first and second pivotal portions being located symmetrically to each other relative to the first toothed portion, an annular second groove defined in the second pivotal portion of each ratchet wheel, the first toothed portion being defined in a curved and concaved manner in the outer periphery of each of the ratchet wheels, a distance defined between a deepest point of the first toothed portion to the first pivotal portion or the second pivotal portion, the distance being larger than a distance that the ratchet wheel shifts within the first room;a pawl unit having a pawl, two engaging plates and a bolt, the pawl being linearly movable within the second room and along the first face or the second face, the pawl having a second toothed portion which is defined in a curved and convex end of the pawl, the second toothed portion being engaged with the first toothed portion, the pawl having a threaded hole, the pawl being connected between the two engaging plates which are located symmetrically to each other relative to the pawl, the two engaging plates being in flush with the top and the bottom of the function end, a third face and a fourth face respectively formed on two sides of each of the two engaging plates, the third and fourth faces respectively slidable along the first and second faces, each of the engaging plates having a distal end, the engaging portion being located between the two distal ends of the two engaging plates so that the pawl is not disengaged from the second room, each engaging plate having a second contact portion which contacts the first contact portion so as to restrict the pawl from entering into the first room when the pawl is moved in the second room, a space defined between the two engaging plates, the bolt extending through the two engaging plates and being connected to the threaded hole to connect the two engaging plates to the pawl, the distal ends being restricted by the engaging portion so as to receive the pawl unit in the second room, when the ratchet wheel shifts relative to the pawl in the first room, the ratchet wheel is engaged with the pawl and located in the first room;a spring located in the space and biased between the second room and the pawl, anda clip engaged with the first and second grooves, when the pawl shifts in the second room, the ratchet wheel is restricted by the clip so as to be located within the first room, the ratchet wheel being disengaged from the first room by pushing the ratchet wheel. 2. The ratchet wrench as claimed in claim 1, wherein the angle is in a range of 30 to 45 degrees. 3. The ratchet wrench as claimed in claim 1, wherein the third room is an elongate room and a first rail is located on at least one of a top and a bottom of the handle, a seat is located in the third room to seal a bottom of the third room, the seat has multiple second mounting portions which are hexagonal protrusions, the second mounting portions are accommodated in the first mounting portions of the ratchet wheels in the third room, a cover has a second rail which is slidably engaged with the first rail to seal and a top of the third room. 4. The ratchet wrench as claimed in claim 1, wherein the handle has an open end in which the third room is defined, a rail is defined in each of two insides of the third room, a seat is received in the third room and has multiple second mounting portions which are cylindrical protrusions, the second mounting portions are accommodated in the first mounting portions of the ratchet wheels, the seat includes a rod on each of two sides thereof, the two rods are slidably engaged with the rails of the third room. 5. The ratchet wrench as claimed in claim 1, wherein one of the two engaging plates is connected to the pawl by the bolt, the other one of the two engaging plate is integral with the pawl. 6. The ratchet wrench as claimed in claim 1, wherein the third room has multiple recesses defined therein, each recess receives one of the ratchet wheels, two supports are formed on one end of the handle, a cover includes a pivot which is pivotably connected to the two supports so that the cover is pivotable about the pivot to be mounted to the handle and seal the third room.