A one-way ratchet wrench according to the present invention includes a wrench body, a ratchet wheel, a pawl, an anchor, an elastic element and the following elements. A cover is hollow and annular and is annularly provided with a groove. The cover is mounted on the first receiving recess of the wrench body and presses against engaging teeth. A clip ring is mounted between the clip groove of the wrench body and the groove of the cover. The cover and the ratchet wheel are thereby mounted in the first receiving recess of the wrench body such that the cover and the ratchet wheel would not disengage from the first receiving recess of the wrench body during rotation.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a one-way ratchet wrench having a bevel groove with a specific angle to avoid the disengagement of an elastic element when the wrench is turned.

2. Description of the Prior Art

A conventional structure as disclosed in U.S. Pat. No. 6,807,882 has the shortcomings:

1. The control groove13of the wrench body10makes a notch in the appearance of the wrench. This results in poor visual aesthetics of the entire assembly.

2. When a drilling tool begins to drill the hole, it is easy to make the position of the drill hole deviated due to the lateral applied force from the arcuate surface. It is more difficult to provide a precise position of the control groove13. The deviation in the position of the drill hole causes defectives to the wrench body10.

3. If it is desired to drill a horizontal control groove13from the second receiving recess15, the processing is more inconvenient.

4. It is less easy to assemble the elastic element70and the anchor60in the narrower second receiving recess15.

Furthermore, the shortcomings of U.S. Pat. No. 5,979,274 are that the elastic restoring force of the bending elastic element13is weakened as well as the life is shorter.

Moreover, the shortcomings of U.S. Pat. No. 5,636,557 are that the structure itself of the control plate15is complicated and has more portions to be bending processed so it requires more labor and time in manufacture and it is substantially difficult to meet the manufacture benefit.

SUMMARY OF THE INVENTION

A one-way ratchet wrench according to the present invention includes a wrench body, a ratchet wheel, a pawl, an anchor, an elastic element and the following elements. A cover is hollow and annular and is annularly provided with a groove. The cover is mounted on the first receiving recess of the wrench body and presses against engaging teeth. A clip ring is mounted between the clip groove of the wrench body and the groove of the cover. The cover and the ratchet wheel are thereby mounted in the first receiving recess of the wrench body such that the cover and the ratchet wheel would not disengage from the first receiving recess of the wrench body during rotation.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

As illustrated inFIGS. 1 and 2, a one-way ratchet wrench according to the present invention includes a wrench body10, a ratchet wheel20, a pawl30, an anchor40, an elastic element50, a cover60, a clip ring70and the following elements:

The acting end of the wrench body10is provided with a first receiving recess11, a smaller-diameter pressing edge111is disposed on the bottom surface of the first receiving recess, one side of the first receiving recess is provided with a curved second receiving recess12which is communicated with the first receiving recess11, the diameter of the second receiving recess12is smaller than that of the first receiving recess11, the center of the curve of the second receiving recess12is located in the first receiving recess11, the center of the circle of the first receiving recess11is at a distance from that of the second receiving recess12, the top and bottom of the second receiving recess12are closed respectively, a bevel groove is disposed on the periphery on one side of the second receiving recess12of the wrench body10, the bevel groove13is circular hole shaped but not through-going, and the longitudinal axis of the bevel groove13intersects the center of the circle of the first receiving recess11and has an included angle with respect to the axis of the wrench body10which is from ten to twenty-five degrees;

The ratchet wheel20is pivotally disposed in the first receiving recess11and provided with a sleeve portion21, and engaging teeth22are circularly arranged around an outer periphery of the ratchet wheel20which presses against the pressing edge111of the wrench body10;

One side of the pawl30is provided with pawl teeth31for engaging with the engaging teeth22of the ratchet wheel20, one side of the pawl30presses against a wall of the second receiving recess12of the wrench body10, and the other side of the pawl30is provided with a pressing surface32;

The anchor40is received in the bevel groove13of the wrench body10and projects into the second receiving recess12, the anchor40does not contact with the engaging teeth22of the ratchet wheel20, and the axis of the anchor40intersects the center of the circle of the first receiving recess11and has an included angle with respect to the axis of the wrench body10which is the same as the included angle between the axis of the bevel groove13and the center of the circle of the first receiving recess11; and

One end of the elastic element50presses against the pressing surface32of the pawl30, the other end of the elastic element50presses against the anchor40, the elastic force of the elastic element50allows the pawl teeth31of the pawl30to engage with the engaging teeth22of the ratchet wheel20, the anchor40is received at a tilt angle in the bevel groove13, the opening C, defined by the anchor40and the pawl30, becomes smaller in width starting from the inner curved surface of the second receiving recess12to the engaging teeth22which resides in the first receiving recess11, and the elastic element50is propped between the pawl30and the anchor40without disengagement such that the elastic element50is positioned within the second receiving recess12.

A cover60is hollow and annular and is annularly provided with a groove61. The cover60is mounted on the first receiving recess11of the wrench body10and presses against engaging teeth22.

A clip ring70is mounted between the clip groove14of the wrench body10and the groove61of the cover60. The cover60and the ratchet wheel20are thereby mounted in the first receiving recess11of the wrench body10such that the cover60and the ratchet wheel20would not disengage from the first receiving recess11of the wrench body10during rotation.

The assembled wrench is shown inFIG. 3.FIG. 4is a front view of the present invention, andFIG. 5is a cross-sectional view taken along line A-A ofFIG. 4.

As illustrated inFIGS. 6 and 7, the axis of the bevel groove13intersects the center of the circle of the first receiving recess11and has an included angle with respect to the axis of the wrench body10which is twenty degrees, namely, the center of the circle of the first receiving recess11serves as a center point and the bevel groove13is disposed on one side deviated from the center point by twenty degrees. The anchor40provided within the bevel groove13is at a twenty-degree tilt angle. The opening C, defined by the anchor40and the pawl30, becomes smaller in width starting from the inner curved surface of the second receiving recess12to the engaging teeth22which resides in the first receiving recess11. The elastic element50is propped between the pawl30and the anchor40without disengagement such that the elastic element50is positioned within the second receiving recess12.

When the wrench body10is turned to fasten a workpiece, the engaging teeth22of the ratchet wheel20engage with the pawl teeth31of the pawl30, one side of the pawl30presses against a wall of the second receiving recess12of the wrench body10, and the other side of the pawl30presses against the elastic element50. Thus, the workpiece can be rotated when the ratchet wheel20is turned counterclockwise, and free rotation occurs when the ratchet wheel20is turned clockwise. The user can change the operation direction as long as the one-way ratchet wrench is turned over to the other side.

As illustrated inFIG. 8, a sleeve portion21of the ratchet wheel20may be in the form of a rectangular head for mating with a sleeve.

As illustrated inFIG. 9, the bevel groove13is disposed on the periphery on one side of the second receiving recess12of the wrench body10. The position where the axis of the bevel groove13of the wrench body10intersects the axis of the wrench body10is located between the centers of the circles of the first receiving recess11and the second receiving recess12, and has a specific spacing H with respect to the center of the circle of the first receiving recess11. The axis of the bevel groove13and the axis of the wrench body10have an included angle of twenty-five degrees, or the position where the axis of the bevel groove13of the wrench body10intersects the axis of the wrench body10coincides with the center of the circle of the second receiving recess12. In the above both cases, there is a small opening C such that the elastic element50is positioned within the second receiving recess12.

As illustrated inFIG. 10, the elastic element50is provided with a portion51sleeved on the anchor40for better positioning of the elastic element50.

The present invention has the advantages as below:

1. The closer to the first receiving recess11the opening C defined by the anchor40and the pawl30goes, the smaller the opening C is. The elastic element50is propped between the pawl30and the anchor40without disengagement such that the elastic element50is positioned within the second receiving recess12of the wrench body10.

2. The appearance of the wrench remains intact, thereby providing improved visual aesthetics.

3. As illustrated inFIGS. 2 and 7, that the bevel groove13is slightly deviated from the original position, or the included angle is eighteen, nineteen or twenty-two degrees.

4. The assembly of the wrench is made in an easy and convenient way and in less time.