Spring devices – Vehicle – Comprising compressible fluid
Reexamination Certificate
2000-11-30
2001-08-14
Schwartz, Christopher P. (Department: 3613)
Spring devices
Vehicle
Comprising compressible fluid
C188S300000, C267S120000
Reexamination Certificate
active
06273405
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to stay dampers used for back doors for motor vehicles, and doors or other movable members for various instruments and apparatus.
A Japanese laid-open Utility Model Application, Kokai No. H01(1989)-128038 discloses a stay damper including a cylinder, a piston rod and a cover of elastic material.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a stay damper capable of holding a piston rod reliably at an extended state.
According to the present invention, a stay damper comprises a cylinder member, a piston rod and a cover. The cylinder member is filled with pressurized filler gas, and extends from a first cylinder end to a second cylinder end which is formed with a notch opening in an axial direction. The piston rod is received slidably in the cylinder member. The piston rod projects from the second cylinder end of the cylinder member, and extends to a projecting rod end. The cover extends from a first cover end to a second cover end which is supported by the projecting rod end of the piston rod in a manner to allow the first cover end to move radially toward the cylinder member, and to enter the notch of the cylinder member.
A stay damper according to another aspect of the invention comprises: a cylinder member extending, in a first longitudinal direction of the stay damper, from a first cylinder end to a second cylinder end which is formed with a notch opening in the first longitudinal direction; a piston rod slidably received in the cylinder member, for moving in the first longitudinal direction relative to the cylinder member for extension of the stay damper, and in a second longitudinal direction opposite to the first longitudinal direction relative to the cylinder member for contraction of the stay damper, the piston rod projecting, in the first longitudinal direction, to a projecting rod end, from the second cylinder end of the cylinder member; and a cover extending, in the first longitudinal direction, from a first cover end to a second cover end which is supported by the rod end of the piston rod in a movable manner to allow the first cover end to move to an off-center position to prevent contraction of the stay damper by engagement of the first cover end of the cover with the notch of the cylinder member.
The other objects and features of this invention will become understood from the following description with reference to the accompanying drawings.
REFERENCES:
patent: 4596383 (1986-06-01), Howard
patent: 5358225 (1994-10-01), Volpel et al.
patent: 1-128038 (1989-08-01), None
Foley & Lardner
Schwartz Christopher P.
Unisia Jecs Corporation
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