Brakes – Internal-resistance motion retarder – Having a thrust member with a variable volume chamber
Reexamination Certificate
1998-09-23
2001-09-11
Oberleitner, Robert J. (Department: 3613)
Brakes
Internal-resistance motion retarder
Having a thrust member with a variable volume chamber
C188S322190
Reexamination Certificate
active
06286640
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a shock absorber intended specifically to serve as stroke ending element, absorbing energy and which can be utilized in any activity requiring the stopping of masses in motion, e.g., to close an automatic door, to stop a conveyor, or in relation to controlling robotics, machine-tools, exercise equipment, press elements and others.
Numerous kinds of shock absorbers exist which permit resistance to shocks from masses in motion. However, these shock absorbers deteriorate relatively rapidly and their shock damping capacity decreases to the extent of their utilization. Their service life is unsatisfactory and defects in the piston guidance appear quickly resulting in rapid wear of the different components, fluid leaks or spring breakage. Furthermore, these shock absorbers do not allow attaining, by simple means, a damping curve, whose characteristics can be modified according to their specific application field.
The present invention proposes to solve these problems by suggesting a shock absorber whose functional and structural characteristics described below permit notable increase in its damping quality as well as its reliability and length of useful life.
SUMMARY OF THE INVENTION
In the subject invention, a shock absorber with a shock absorber body, a principal piston supported by a piston rod, a principal compression chamber in which slides the principal piston where the piston divides the interior of the chamber into an internal front portion and an internal rear portion where the piston slides from the front to the rear at the time of compression of the compression of the shock absorber, where there is an elastic return device, a volume compensation device, hydraulic fluid, a pressure relief channel where the pressure relief channel is constituted by the whole internal surface of the peripheral wall of the principal compression chamber along the length of the principal piston and the whole external peripheral wall of the principal piston.
According to a second embodiment of the present invention, the principal compression chamber has an internal peripheral surface of the transverse circular section, whose diameter is variable according to the longitudinal axis of rotation (XX′).
According to a third embodiment of the present invention, the principal compression chamber has an internal peripheral surface of transverse circular section, whose diameter is constant according to the longitudinal axis of rotation (XX′).
In an additional aspect of the present invention, the principal piston is equipped with a peripheral external cylindrical wall, the diameter of which is smaller than the diameter of the peripheral internal surface of the principal compression chamber.
In a further aspect of the present invention, the principal piston is equipped on its external wall with an annular rolling projection, whose external diameter is smaller than the diameter of the internal peripheral wall of the principal compression chamber.
In a further aspect of the present invention, the shock absorber is equipped with a secondary compensation chamber and a flow system permitting the hydraulic fluid to circulate between the internal front portion of the principal compression chamber and the secondary compensation chamber.
The flow system can be constituted in part by flow grooves situated on the peripheral external wall of the principal compression chamber.
Another characteristic of the invention is that the volume compensation device is constituted by a secondary piston able to slide to the interior of the secondary compensation chamber, the piston being equipped with a device ensuring the tightness of the secondary chamber.
The elastic return device can be constituted by a return spring acting contrary to the sliding of the secondary piston and can be positioned as support on a stop wall integral with the body at one of its ends and on the rear portion of the secondary piston at the other end, the rear portion being the one which is not in contact with the hydraulic fluid contained in the secondary compensation chamber.
Still further advantages of the present invention will become apparent to those ordinarily skilled in the art upon reading and understanding the following detailed description of the preferred embodiments.
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Bertrand Michel
Perret Jean-Pierre
Etablissements Jean Perret
Fay Sharpe Fagan Minnich & McKee LLP
Oberleitner Robert J.
Williams Thomas J.
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