Pipe wrench

• US 7,096,764 B2
• Filed: 03/12/2002
• Issued: 08/29/2006
• Est. Priority Date: 09/13/1999
• Status: Expired due to Fees

• Current Assignee: Fasmac Pte Limited
• Original Assignee: Fasmac Pte Limited
• Inventors: Dong, Zhigang
• Primary Examiner(s): Wilson, Lee D.
• Application Number:
  US10/096,097
• Publication Number:
  US 20020121162A1
• Time in Patent Office: 1,631 Days
• Field of Search: 81/98, 81/99, 811/11, 811/86, 81 92- 94, 81/97
• US Class Current: 81/99
• CPC Class Codes: B25B 13/28 the jaws being pivotally movable
• CPC Class Codes: B25B 13/505 Pivotally moving or adjustable

Abstract

A Pipe Wrench with: reasonable coordination on distance between—Center of Arcuate Teeth and Link-Hole, eccentric length of Tips of Arcuate Teeth and Link-Hole; Instant Grip and Release, Time-Saving, Power-Saving, easy Operation is disclosed. It is composed of Heading-Hook, Main Body, Arcuate Jaw-Block, Spring-Guard Plate, Spring, Oil-Rope, Pin and Screw Bolt. The Jaw-Block designed by two (2) different sizes of Arc is inlaid in Slot B on Handle, due to designed size of Link-Hole being eccentric from center of Arcs of Jaw-Block is well coordinated with Arcs on Tip Teeth of Jaw-Block, which enables this Invention with Reliable and Firm Self-Lock on workpiece as well as its Open-Width being enlarged.

Claims

1. A pipe wrench, comprising:

a main body for providing a handle;

a fixed jaw coupled to the main body, the fixed jaw being formed by at least two arcing jaw faces that are congruent and extend away from the main body;

an angled jaw pivotably coupled to the main body for interacting with the fixed jaw for clamping, the angled jaw having at least two substantially straight jaw faces which face the at least two arcing jaw faces at an angle to each other for providing a three-point grip in conjunction with the fixed jaw during clamping; and

a pivot disposed on the main body adjacent to the fixed jaw for pivotably coupling the angled jaw to the main body,

wherein the angle between said at least two substantially straight jaw faces of the angled jaw is obtuse and a radius of curvature of a first arc subtending the arcing jaw face proximal to the pivot is smaller than a radius of curvature of a second arc subtending the arcing jaw face distal to the pivot.

2. The wrench as in claim 1, wherein the fixed jaw is removably coupled to the main body.

3. The wrench as in claim 2, where the fixed jaw is removably coupled to the main body by being inserted into a slot in the main body.

4. The wrench as in claim 1, further including a biasing means for biasing the angled jaw towards the fixed jaw for clamping.

5. The wrench as in claim 1, wherein the jaw faces have gripping surfaces.

6. The wrench as in claim 5, wherein the gripping surfaces have teeth.

7. The wrench as in claim 1, wherein a longitudinal separation between the pivot and an extremity of the fixed jaw furthest away from the main body is 20 to 50 mm.

8. The wrench as in claim 1, wherein a longitudinal separation between the pivot and an extremity of one of the substantially straight jaw faces of the angled jaw which is proximal to the pivot nearest to the main body is 26 to 58 mm.

9. The wrench as in claim 1, wherein a longitudinal separation between the pivot and a center point of the larger arcing jaw face is 8 to 65 mm.

10. The wrench as in claim 1, wherein a transverse separation between the pivot and a center point of the larger arcing jaw face is 10 to 43 mm.

11. The wrench as in claim 1, wherein a longitudinal separation between the pivot and a center point of the smaller arcing jaw face is 2 to 33 mm.

12. The wrench as in claim 1, wherein a transverse separation between the pivot and a center point of the smaller arcing jaw face is 16 to 62 mm.

13. The wrench as in claim 1, wherein a radius of curvature of an arc subtending the larger arc jaw face is 30 to 120 mm.

14. The wrench as in claim 13, wherein a radius of curvature of an arc subtending the smaller arc jaw face is 20 to 90 mm.

15. A pipe wrench, comprising:

a main body for providing a handle;

a fixed jaw being removably coupled to the main body, the fixed jaw being formed by at least two arcing jaw faces that are congruent and extend away from the main body;

an angled jaw pivotably coupled to the main body for interacting with the fixed jaw for clamping, the angled jaw having at least two substantially straight jaw faces which face the at least two arcing jaw faces at an angle to each other for providing a three-point grip in conjunction with the fixed jaw during clamping;

a pivot disposed on the main body adjacent to the fixed jaw for pivotably coupling the angled jaw to the main body; and

a biasing means for biasing the angled jaw towards the fixed jaw for clamping,

wherein the angle between said at least two substantially straight jaw faces of the angled jaw is obtuse and a radius of curvature of a first arc subtending the arcing jaw face proximal to the pivot is smaller than a radius of curvature of a second arc subtending the arcing jaw face distal to the pivot.

16. A pipe wrench, comprising:

a main body for providing a handle;

a fixed jaw coupled to the main body, the fixed jaw being formed by at least two arcing jaw faces that are congruent and extend away from the main body;

an angled jaw pivotably coupled to the main body for interacting with the fixed jaw for clamping, the angled jaw having at least two substantially straight jaw faces which face the at least two arcing jaw faces at an angle to each other for providing a three-point grip in conjunction with the fixed jaw during clamping;

a pivot disposed on the main body adjacent to the fixed jaw for pivotably coupling the angled jaw to the main body; and

a biasing means for biasing the angled jaw towards the fixed jaw for clamping,

wherein the angle between said at least two substantially straight jaw faces of the angled jaw is obtuse and a radius of curvature of a first arc subtending the arcing jaw face proximal to the pivot is smaller than a radius of curvature of a second arc subtending the arcing jaw face distal to the pivot.

17. The wrench as in claim 16, wherein the fixed jaw is removably coupled to the main body.

18. The wrench as in claim 17, wherein the fixed jaw is removably coupled to the main body by being inserted into a slot in the main body.

19. The wrench as in claim 16, wherein a longitudinal separation between the pivot and an extremity of the fixed jaw furthest away from the main body is 20 to 50 mm, a longitudinal separation between the pivot and an extremity of the substantially straight jaw on the angled jaw proximal to the pivot nearest to the main body is 26 to 58 mm, a longitudinal separation between the pivot and a center point of the larger arcing jaw face is 8 to 65 mm, a transverse separation between the pivot and the center point of the larger arcing jaw face is 10 to 43 mm, a longitudinal separation between the pivot and a center point of the smaller arcing jaw face is 2 to 33 mm, and a transverse separation between the pivot and the center point of the smaller arcing jaw face is 16 to 62 mm.

20. The wrench as in claim 16, wherein a radius of curvature of a first arc subtending the larger arc jaw face is 30 to 120 mm, and a radius of curvature of a second arc subtending the smaller arc jaw face is 20 to 90 mm.