Mine roof expansion anchor and bail element

Patent 5344257 Issued on September 6, 1994. Estimated Expiration Date:

December 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2799201

3726181

3896627

Mine roof expansion anchor
Patent #: 3941028
Issued on: 03/02/1976
Inventor: Lobello , et al.

Mine roof anchor assembly
Patent #: 4437795
Issued on: 03/20/1984
Inventor: White

Combination expansion shell and resin secured mine roof anchor assembly
Patent #: 4483645
Issued on: 11/20/1984
Inventor: White , et al.

Combined resin-mechanical mine roof support anchor
Patent #: 4516886
Issued on: 05/14/1985
Inventor: Wright

Combination expansion shell and resin secured mine roof anchor assembly
Patent #: 4556344
Issued on: 12/03/1985
Inventor: White

Anchor assembly for a mine roof bolt
Patent #: 5018908
Issued on: 05/28/1991
Inventor: Laphon

Expansion bolt Patent #: 5028188
Issued on: 07/02/1991
Inventor: Prince

Inventors

Assignee

The Eastern Company

Application

No. 984498 filed on 12/02/1992

US Classes:

405/259.4, Bolt having wedge expander405/259.1, Rock or earth bolt or anchor411/65, Ring or sleeve type411/67Bight type

Examiners

Primary: Reese, Randolph A.
Assistant: Ricci, John A.

Attorney, Agent or Firm

McGuire; Charles S.

Foreign Patent References

2434502 DE 01/13/1976
1128024 FR 08/13/2012

International Class

E21D 020/00

Abstract

A bail element (10) having a medial portion (12) with a pair of legs (14, 16) extending integrally therefrom and a mechanical expansion anchor having a pair of shell halves (68, 70) and tapered plug (80) held in assembled relation by the bail. The bail legs are identical to one another and, prior to assembly with the shell halves and plug, have three distinct, linear portions (46, 48, 50) respectively extending at preferred angles of about 10°, 36° and 12.5° with respect to lines parallel to the bail centerline (A--A). The bail medial portion includes a pair of upstanding portions shown in a first embodiment (34, 36) and a second embodiment (54, 56) for puncturing a resin cartridge which may be installed with the anchor.