Labor-saving pivotal shaft structure

Details Labor-saving pivotal shaft structure Labor-saving pivotal shaft structure

2006-10-10

2010-06-29

Miller, William L. (Department: 3677)

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Hinge

Resiliently biased hinge

C016S321000, C361S679270

Reexamination Certificate

active

07743466

ABSTRACT:
The present invention discloses a labor-saving pivotal shaft structure, comprising a fixed part and a movable part, wherein the movable part and the fixed part produce a frictional torque therebetween to provide the movable part with the functions of rotating, arresting, and positioning relative to the fixed part; and a torsion rod which is a rigid rod, whose one end is mounted onto the fixed part; such that the fixed part is connected to a main frame and the movable part as well as the other end of the torsion rod are respectively connected to a cover frame, and thus when the cover frame is being closed down, the fixed part is in a fixed condition and the torsion rod and the cover frame rotate together, leading to the torsion rod being in a twisted condition of storing energy; whereas when the cover frame is being opened up, the stored energy of the torsion rod is released to provide an auxiliary force.

REFERENCES:
patent: 5190391 (1993-03-01), Huong
patent: 5533234 (1996-07-01), Bizek
patent: 5771540 (1998-06-01), Carpenter et al.
patent: 5787549 (1998-08-01), Soderlund
patent: 6510588 (2003-01-01), Eromaki
patent: 6648398 (2003-11-01), Duffy

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