Pawl-less ratchet wrench

• US 20050115366A1
• Filed: 07/27/2004
• Published: 06/02/2005
• Est. Priority Date: 07/28/2003
• Status: Active Grant

• Current Assignee: Apex Brands Inc.
• Original Assignee: Easco Hand Tools Incorporated (Danaher Corporation)
• Inventors: Chaconas, Peter C.
• Granted Patent: US 7,051,623 B2
• Time in Patent Office: Days
• US Class Current: 81/60
• CPC Class Codes: B25B 13/461 with concentric driving and driven member
• CPC Class Codes: B25B 13/463 a pawl engaging an externally toothed wheel

Abstract

The present invention provides a wrench having a handle integral with a ratchet head. The ratchet head defines a chamber having a generally circular sidewall. An annular rotor having radial teeth about an outer surface thereof is located in the chamber. The rotor teeth engage a set of teeth extending radially inward from the sidewall of the chamber. A biasing element, such as a leaf spring, is provided to urge the rotor teeth into engagement with the sidewall teeth. Preferably, the sidewall teeth will be configured having progressively increasing heights in the direction in which the rotor turns during ratcheting.

Claims

1. A wrench comprising:

a handle;

a ratchet head integral with said handle;

said ratchet head defining a chamber having a generally circular sidewall;

a set of sidewall teeth located in said chamber and extending radially inward;

an annular rotor located in said chamber, said rotor having rotor teeth about an outer surface thereof for engaging said sidewall teeth; and

a biasing element configured to urge said rotor teeth into engagement with said sidewall teeth.

2. A wrench as set forth in claim 1, wherein said biasing element comprises a leaf spring.

3. A wrench as set forth in claim 1, wherein said sidewall teeth are configured having progressively increasing heights in the direction in which said rotor turns during ratcheting.

4. A wrench as set forth in claim 3, wherein said sidewall teeth are located in a distal hemisphere of said ratchet head.

5. A wrench as set forth in claim 4, wherein said biasing element is located in said distal hemisphere of said ratchet head.

6. A wrench as set forth in claim 5, wherein said biasing element comprises a leaf spring.

7. A wrench as set forth in claim 3, wherein said progressively increasing heights of said sidewall teeth follow the path of a gradual spiral originating ahead of a first tooth in said set.

8. A wrench as set forth in claim 1, wherein rotor teeth are configured having a front surface and a back surface interconnected by a top surface.

9. A wrench as set forth in claim 8, wherein said back surface of each said rotor tooth has a more gradual slope in comparison with said front surface thereof.

10. A wrench as set forth in claim 9, wherein said front surface has a slope canted forward of perpendicular.

11. A wrench as set forth in claim 1, further comprising first and second end plates located on respective sides of said ratchet head to maintain said rotor in said chamber.

12. A wrench as set forth in claim 1, wherein said rotor defines a central opening therethrough.

13. A wrench as set forth in claim 12, wherein said central opening has a multi-point surface for engaging a fastener.

14. A ratcheting tool comprising:

a ratchet head defining a chamber having a generally circular sidewall;

a set of sidewall teeth located in said chamber and extending radially inward;

an annular rotor located in said chamber, said rotor having rotor teeth about an outer surface thereof for engaging said sidewall teeth; and

said sidewall teeth being configured having progressively increasing heights in the direction in which said rotor turns during ratcheting.

15. A ratcheting tool as set forth in claim 14, further comprising a biasing element configured to urge said rotor teeth into engagement with said sidewall teeth.

16. A ratcheting tool as set forth in claim 15, wherein said biasing element comprises a leaf spring.

17. A ratcheting tool as set forth in claim 14, wherein said progressively increasing heights of said sidewall teeth follow the path of a gradual spiral originating ahead of a first tooth in said set.

18. A ratcheting tool as set forth in claim 14, wherein said rotor teeth are configured having a front surface and a back surface interconnected by a top surface.

19. A ratcheting tool as set forth in claim 18, wherein said back surface of each said rotor tooth has a more gradual slope in comparison with said front surface thereof.

20. A ratcheting tool as set forth in claim 19, wherein said front surface has a slope canted forward of perpendicular.