Utility bar

• US 6,257,553 B1
• Filed: 09/27/1999
• Issued: 07/10/2001
• Est. Priority Date: 07/22/1998
• Status: Expired due to Term

• Current Assignee: Northern Tool & Equipment Company Incorporated
• Original Assignee: Olympia Group, Inc.
• Inventors: Khachatoorian, Zareh
• Primary Examiner(s): Hail, III, Joseph J.
• Assistant Examiner(s): WILSON, LEE D
• Application Number:
  US09/406,055
• Time in Patent Office: 652 Days
• Field of Search: 254/25, 254/21, 254/30, 254/27, 254/19, 254/18, 254/23
• US Class Current: 254/25
• CPC Class Codes: B66F 15/00 Crowbars or levers

Abstract

An improved utility bar includes an elongate shank which has a longitudinal axis, a prying hook at one end and a prying chisel at the other end. The prying hook has a tapered portion extending along a direction generally an angle α with the longitudinal axis and a generally U-shaped portion integrally formed with the shank and the tapered portion. The tapered and U-shaped portions together form a prying footprint surface facing a direction away from the shank. The angle α is selected to be greater than 90° and preferably selected within the range of 93°-110°. The prying footprint has a minimum transverse dimension which is substantially greater than the minimum cross sectional dimension of the shank.

Claims

1. A prying bar comprising an elongate shank having a predetermined cross section and defining a longitudinal axis and having a prying hook at one end and a prying chisel at the other end, said prying hook having a tapered portion and a generally U-shaped portion integrally formed with said shank and said tapered portion generally defining a common plane, said tapered and U-shaped portions forming a prying footprint surface facing a direction away from said shank, said prying footprint surface having a minimum transverse dimension which is substantially greater than the minimum cross sectional dimension of said shank, and said predetermined cross section having a major axis generally parallel to said plane and a minor axis generally normal to said plane, whereby the strength of the prying bar in applying forces at said prying hook and said prying chisel can be maximized and the bending of said prying bar shank can be minimized while enhancing the comfort gripping said prying bar shank by a user.

2. A utility bar as defined in claim 1, wherein said shank has a generally oblong cross section.

3. A utility bar as defined in claim 2, wherein said cross section defines major and minor axes having relative dimensions approximately in the ratio of 2:

1.

4. A utility bar as defined in claim 2, wherein said cross section has a major axis generally parallel to said tapered portion.

5. A prying bar comprising an elongate shank having a predetermined cross section and defining a longitudinal axis and having a prying hook at one end and a prying chisel at the other end, said prying hook having a tapered portion and together generally U-shaped portion integrally formed with said shank and said tapered portion generally defining a common plane, said tapered and U-shaped portions forming a prying footprint surface facing a direction away from said shank, said prying footprint surface forming the fulcrum point about which prying takes place, said tapered and U-shaped portions having a width dimension in a direction transverse to said plane greater than the corresponding dimension of said shank in said transverse direction, a transition in said dimensions taking place at a location generally where said shank is connected to said U-shaped portion.

6. A utility bar as defined in claim 5, wherein a minimum transverse direction of said prying hook footprint is equal to approximately twice the minimum cross sectional dimension of said shank.

7. A utility bar as defined in claim 5, wherein said longitudinal axis generally bisects said prying hook with said tapered portion being arranged on one side and said generally U-shaped portion being arranged on the other side of said longitudinal axis.

8. A utility bar as defined in claim 5, wherein said prying hook and said prying chisel have working lengths approximately equal to each other.

9. A utility bar as defined in claim 5, wherein said prying chisel defines a prying footprint during use having a minimum transverse dimension which is greater than the minimum cross sectional dimension of said shank.

10. A utility bar as defined in claim 5, wherein said tapered portion is provided with a beveled edge to facilitate penetration against a surface to be moved.

11. A utility bar as defined in claim 5, wherein said prying chisel is provided with a beveled edge at the free end thereof to facilitate penetration against a surface to be moved.

12. A utility bar as defined in claim 5, wherein said utility bar is made of steel.

13. A utility bar as defined in claim 12, wherein said steel is forged steel.

14. A utility bar as defined in claim 12, wherein said steel is heat treated.

15. A utility bar as defined in claim 5, wherein said tapered portion is provided with a generally V-shaped notch suitable for engaging a nail head.

16. A utility bar as defined in claim 5, wherein the dimensions of said prying hook and prying chisel along the direction of said longitudinal axis are approximately the same.

17. A utility bar as defined in claim 16, wherein the dimension of said prying hook is less than the dimension of said prying chisel along the direction of said longitudinal axis.

18. A utility bar as defined in claim 5, wherein a minimum transverse dimension of said prying chisel footprint is substantially greater than the minimum cross sectional dimension of said shank.

19. A prying bar comprising an elongate shank having a generally oblong cross section and defining a longitudinal axis and having a prying hook at one end and a prying chisel at the other end, said prying hook having a tapered portion and together generally U-shaped portion integrally formed with said shank and said tapered portion generally defining a common plane of symmetry extending through the centers of said shank, prying hook, prying chisel and U-shaped portion, said tapered and U-shaped portions forming a prying footprint surface facing a direction away from said shank, said prying footprint surface forming the fulcrum point about which prying takes place, said shank having a major axis within said common plane greater than a minor axis along a direction transverse to said common plane.