Linear motion damping device

Details Linear motion damping device Linear motion damping device

1999-08-24

2001-12-04

Oberleitner, Robert J. (Department: 3613)

Brakes

Frictional vibration damper

C188S067000

Reexamination Certificate

active

06325188

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a damping device, and more particularly to a linear motion damping device.
BACKGROUND OF THE INVENTION
The conventional linear motion damping device, such as an oil pressure cylinder or air pressure cylinder, is generally formed of a cylindrical body which is provided therein with a dragging rod intended to be pushed or pulled. The dragging rod is provided with a resistance by a hydraulic oil, gas, or spring at the time when the dragging rod is engaged in the axial displacement. The linear motion damping device is widely used in various fields, such as an exercise machine, a hatchback door, a furniture, a structure door, a smoke exhausting window, etc. As the dragging rod of the linear motion damping device is displaced, the fluid contained in the cylindrical body is exerted on by a constant pressure, thereby resulting in a gradual sealing deterioration. The damping device is thus useless. The implication is that the load of the conventional linear motion damping device is often limited such that the speed at which the dragging rod displaces axially is compromised. For this reason, the sealing structure of a damping device with a large load must be specially designed at the expense of the structural simplicity of the damping device.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide a linear motion damping device which is simple in construction and is capable of sustaining a greater load without an increase in the volume of the damping device.
It is another objective of the present invention to provide a linear motion damping device which is provided with different resistance forces at the time when the dragging rod of the damping device is pushed or pulled to displace axially.
In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by a linear motion damping device which is essentially composed of a cylindrical body, a dragging rod, and a fastening member. The cylindrical body is provided with a receiving compartment and an axial hole in communication with two ends of the receiving compartment. The dragging rod is provided with a threaded portion and is slidably received in the axial hole and the receiving compartment. The fastening member is engaged with the threaded portion of the dragging rod such that the fastening member turns around the axial direction of the dragging rod at the time when the dragging rod is exerted on by an external force, thereby providing the dragging rod with a damping force along the axial displacement of the dragging rod.
The foregoing objectives, features and functions of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.


REFERENCES:
patent: 2471857 (1949-05-01), Bleakney et al.
patent: 4094387 (1978-06-01), Pelat et al.
patent: 4474273 (1984-10-01), Le Pierres et al.
patent: 4524851 (1985-06-01), Sawano et al.
patent: 5689995 (1997-11-01), Heckel, Jr.

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