U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Weight-lifting apparatus and method

Patent 5839997 Issued on November 24, 1998. Estimated Expiration Date: Icon_subject January 22, 2018. 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.

Patent References

1779594

3771785

3825253

3913908

Dumbbell
Patent #: 4453710
Issued on: 06/12/1984
Inventor: Plotz

Dumbbell, adjustable, and locking means
Patent #: 4529197
Issued on: 07/16/1985
Inventor: Gogarty

Weight lifting apparatus
Patent #: 4529198
Issued on: 07/16/1985
Inventor: Hettick, Jr.

Exercise lifting bar with self-contained weight mounts
Patent #: 4787629
Issued on: 11/29/1988
Inventor: DeMyer

Barbell system
Patent #: 4822034
Issued on: 04/18/1989
Inventor: Shields

Variable add-on weight device
Patent #: 4971305
Issued on: 11/20/1990
Inventor: Rennex

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Inventors

Assignee

Application

No. 010863 filed on 01/22/1998

US Classes:

482/107, Having securing member (e.g., locking collar, etc.) for retaining weight on bar482/108Bar held by single hand of user (e.g., dumbbell, etc.)

Examiners

Primary: Mulcahy, John

Attorney, Agent or Firm

Foreign Patent References

  • 1468902 FR. 02/12/1967
  • 1643024 SU. 07/12/1987
  • 1780780 SU. 12/12/1992

International Class

A63B 021/075

Abstract

A weight-lifting apparatus includes a plurality of weights each having a central hole and a slot extending from the central hole to a perimeter of the associated weight, the slot having a width less than the diameter of the central hole. The apparatus further includes a shaft having opposing ends defining a diameter about equal to the central holes, and a sleeve positioned on the shaft. The shaft is shaped to rotatably engage the central holes and is rotatable to different positions. The shaft further has a plurality of recessed surfaces on the opposing ends corresponding to the different positions that extend different longitudinal lengths, the recessed surfaces defining with other surfaces on the shaft a reduced dimension about equal to the width of the slot. Further, the shaft and the weights are configured so that by rotating the shaft, the recessed surfaces are selectively positioned to allow the shaft to slide along one or more of the slots, thus selectively releasing the weights. A person using the weight-lifting apparatus can easily rotate the shaft to select a desired number of weights without interrupting their exercise routine.

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