Reversible ratcheting tool with improved pawl

• US 6,918,323 B2
• Filed: 11/01/2002
• Issued: 07/19/2005
• Est. Priority Date: 11/01/2002
• Status: Expired due to Term

• Current Assignee: Apex Brands Inc.
• Original Assignee: Easco Hand Tools Incorporated (Danaher Corporation)
• Inventors: Arnold, Robert L., Folkenroth, Richard P.
• Primary Examiner(s): Hail, III, Joseph J.
• Assistant Examiner(s): Grant, Alvin J
• Application Number:
  US10/286,603
• Publication Number:
  US 20040083860A1
• Time in Patent Office: 991 Days
• Field of Search: 81/632, 81/63, 81/631, 81/62, 81/573.9, 81/584
• US Class Current: 81/63.2
• CPC Class Codes: B25B 13/463 a pawl engaging an externally toothed wheel
• CPC Class Codes: B25B 13/468 with possibility of locking the ratchet mechanism

Abstract

A ratcheting tool includes a body and a gear disposed in the body. The gear defines a plurality of teeth on a circumference of the gear so that the gear teeth define a first arc having a first radius. A pawl is disposed in the body so that the pawl is movable laterally with respect to the gear between a first position, in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction, and a second position, in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction. The pawl defines a plurality of teeth facing the gear, and the pawl teeth define a second arc having a second radius larger than the first radius.

Claims

1. A ratcheting tool, said ratcheting tool comprising:

a body;

a gear disposed in the body and defining a plurality of teeth on a circumference of the gear so that the gear teeth define a first arc having a first radius; and

a pawl disposed in the body so that the pawl is movable laterally with respect to the gear between

a first position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction and

a second position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction,

wherein the pawl defines a plurality of teeth facing the gear and wherein the pawl teeth define a second arc having a second radius larger than the first radius.

2. The tool as in claim 1, wherein a ratio of the first radius to the second radius is within a range from 1:

1.08 to 1;

1.3.

3. The tool as in claim 1, wherein the first radius extends from a center of curvature of the first arc to troughs defined between the gear teeth.

4. The tool as in claim 3, wherein the second radius extends from a center of curvature of the second arc to tips of the pawl teeth.

5. The tool as in claim 1, wherein edges of the gear teeth are substantially straight and extend between opposite axial ends of the gear in parallel with each other, and wherein edges of the pawl teeth are substantially straight and extend between opposite sides of a face of the pawl in parallel with each other and with the gear teeth edges.

6. The tool as in claim 1, wherein edges of the gear teeth extend between opposite axial ends of the gear in uniform curves extending inward from the opposite axial ends so that an outer surface of the gear defined by the teeth is concave at a center area, wherein edges of the pawl teeth extend between opposite sides of a face of the pawl in uniform curves extending away from the opposite sides so that the pawl face is convex at a center area, and wherein the pawl teeth engage the gear teeth at the center area of the pawl and the center area of the gear.

7. The tool as in claim 6, wherein a third arc extends between the opposite axial ends of the gear and is defined by the gear'"'"'s concave center area, wherein a radius of a fourth arc extends between the opposite sides of the pawl face and is defined by the pawl'"'"'s convex center area so that the fourth arc opposes the third arc when the gear teeth engage the pawl teeth, and wherein a radius defined by the third arc is greater than a radius defined by the fourth arc.

8. A ratcheting tool, said ratcheting tool comprising:

a body having a head and an elongated arm attached to the head;

a first compartment defined by the head;

a second compartment defined by the body and opening to the first compartment;

a gear disposed in the first compartment and defining a plurality of teeth on an outer circumference of the gear so that the gear teeth face the second compartment and so that the gear teeth define a first arc having a first radius; and

a pawl disposed in the second compartment so that the pawl is slidable across the second compartment laterally with respect to the gear between

a first position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction and

a second position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction,

wherein the pawl defines a plurality of teeth facing the gear and wherein the pawl teeth define a second arc having a second radius larger than the first radius.

9. The tool as in claim 8, including a lever disposed in the body in driving engagement with the pawl so that actuation of the lever drives the pawl between the first position and the second position.

10. The tool as in claim 8, wherein a ratio of the first radius to the second radius is within a range from 1:

1.08 to 1;

1.3.

11. The tool as in claim 10, wherein the ratio of the first radius to the second radius is 1:

1.09.

12. The tool as in claim 10, wherein the ratio of the first radius to the second radius is 1:

1.12.

13. The tool as in claim 8, wherein the gear includes a post extending axially from the gear and away from the head and wherein the post is configured to receive and retain a drive socket thereon.

14. The tool as in claim 8, wherein the gear defines a center hole about which the gear defines a plurality of flats disposed so that the gear applies rotational torque to a work piece received by the center hole and engaging the flats.

15. The tool as in claim 8, wherein the first radius extends from a center of curvature of the first arc to troughs defined between the gear teeth.

16. The tool as in claim 15, wherein the second radius extends from a center of curvature of the second arc to tips of the pawl teeth.

17. The tool as in claim 16, wherein the pawl teeth have rounded tips and wherein the second radius extends to the rounded tips.

18. The tool as in claim 16, wherein the pawl teeth have rounded tips and wherein the second radius extends to theoretical tips of the pawl teeth defined by a theoretical intersection of flat sides of the pawl teeth.

19. The tool as in claim 8, wherein edges of the gear teeth are substantially straight and extend between opposite axial ends of the gear in parallel with each other, and wherein edges of the pawl teeth are substantially straight and extend between opposite sides of a face of the pawl in parallel with each other and with the gear teeth edges.

20. The tool as in claim 8, wherein edges of the gear teeth extend between opposite axial ends of the gear in uniform curves extending inward from the opposite axial ends so that an outer surface of the gear defined by the teeth is concave at a center area, wherein edges of the pawl teeth extend between opposite sides of a face of the pawl in uniform curves extending away from the opposite sides so that the pawl face is convex at a center area, and wherein the pawl teeth engage the gear teeth at the center area of the pawl and the center area of the gear.

21. The tool as in claim 20, wherein a third arc extends between the opposite axial ends of the gear and is defined by the gear'"'"'s concave center area, wherein a radius of a fourth arc extends between the opposite sides of the pawl face and is defined by the pawl'"'"'s convex center area so that the fourth arc opposes the third arc when the gear teeth engage the pawl teeth, and wherein a radius defined by the third arc is greater than a radius defined by the fourth arc.

22. A ratcheting tool, said ratcheting tool comprising:

a body having a head and an elongated arm attached to the head;

a first compartment defined by the head;

a second compartment defined by the body and opening to the first compartment;

a gear disposed in the first compartment and defining a plurality of teeth on an outer circumference of the gear so that the gear teeth face the second compartment and so that the gear teeth define a first arc having a first radius;

a pawl disposed in the second compartment so that the pawl is slidable across the second compartment laterally with respect to the gear between

a first position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction and

a second position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction,

wherein the pawl defines a plurality of teeth facing the gear, wherein the pawl teeth define a second arc having a second radius larger than the first radius, and wherein a ratio of the first radius to the second radius is within a range from 1;

1.08 to 1;

1.3; and

a lever disposed in the body in driving engagement with the pawl so that actuation of the lever drives the pawl between the first position and the second position.

23. A ratcheting tool, said ratcheting tool comprising:

a body;

a gear disposed in the body and defining a plurality of teeth on a circumference of the gear; and

a pawl defining a plurality of teeth facing the gear, wherein the pawl is disposed in the body so that the pawl is movable laterally with respect to the gear between

a first position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction and

a second position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction,

wherein edges of the gear teeth extend between opposite axial ends of the gear in uniform curves extending inward from the opposite axial ends so that an outer surface of the gear defined by the teeth is concave at a center area,

wherein edges of the pawl teeth extend between opposite sides of a face of the pawl in uniform curves extending away from the opposite sides so that the pawl face is convex at a center area,

wherein the pawl teeth engage the gear teeth at the center area of the pawl and the center area of the gear,

wherein a first arc extends between the opposite axial ends of the gear and is defined by the gear'"'"'s concave center area,

wherein a radius of a second arc extends between the opposite sides of the pawl face and is defined by the pawl'"'"'s convex center area so that the second arc opposes the first arc when the gear teeth engage the pawl teeth, and

wherein a radius defined by the first arc is greater than a radius defined by the second arc.

24. A ratcheting tool, said ratcheting tool comprising:

a body having a head and an elongated arm attached to the head;

a first compartment defined by the head;

a second compartment defined by the body and opening to the first compartment;

a gear disposed in the first compartment and defining a plurality of teeth on an outer circumference of the gear so that the gear teeth face the second compartment; and

a pawl defining a plurality of teeth facing the gear, wherein the pawl is disposed in the second compartment so that the pawl is slidable across the second compartment laterally with respect to the gear between

a first position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in a first rotational direction and

a second position in which the pawl is disposed between the body and the gear so that the body transmits torque through the pawl in an opposite rotational direction,

wherein edges of the gear teeth extend between opposite axial ends of the gear in uniform curves extending inward from the opposite axial ends so that an outer surface of the gear defined by the teeth is concave at a center area,

wherein edges of the pawl teeth extend between opposite sides of a face of the pawl in uniform curves extending away from the opposite sides so that the pawl face is convex at a center area,

wherein the pawl teeth engage the gear teeth at the center area of the pawl and the center area of the gear,

wherein a first arc extends between the opposite axial ends of the gear and is defined by the gear'"'"'s concave center area,

wherein a radius of a second arc extends between the opposite sides of the pawl face and is defined by the pawl'"'"'s convex center area so that the second arc opposes the first arc when the gear teeth engage the pawl teeth, and

wherein a radius defined by the first arc is greater than a radius defined by the second arc.

25. A ratcheting tool, said ratcheting tool comprising:

a body;

a gear disposed in the body and defining a plurality of teeth on a circumference of the gear; and

a pawl having a front side facing the gear and a back side opposite the front side,

wherein the front side defines a plurality of teeth,

wherein the pawl is split from the front side to the back side into two halves pivotally connected to each other, and

wherein the pawl is disposed in the body so that the pawl is movable laterally with respect to the gear between

a first position in which a first half of the pawl is disposed between the body and the gear so that the body transmits torque through the first half in a first rotational direction and in which a second half of the pawl is pivotable with respect to the first half away from the gear, and

a second position in which the second half is disposed between the body and the gear so that the body transmits torque through the second half in an opposite rotational direction and in which the first half is pivotable with respect to the second half away from the gear.