Spring devices – Fluid – Bumper
Patent
1974-12-02
1976-03-16
Marbert, James B.
Spring devices
Fluid
Bumper
267 64R, 293 70, 188288, F16F 500
Patent
active
039441989
ABSTRACT:
An impact absorber for an automobile bumper includes a first cylinder having a closed end and filled with a damping liquid. A second cylinder, closed at one end and having a radial partition wall therein, moves within the first cylinder for transmitting an impact force to the damping liquid. A sealing member is secured to the inner part of the first cylinder to define a first chamber with the first and second cylinders. A plurality of throttling ports are provided on the second cylinder for expelling the damping liquid from the first chamber thereby providing a variable orifice effect in cooperation with the sealing member upon movement of the second cylinder for dampening the impact force. A second chamber is provided for receiving the expelled damping liquid. The expelled damping liquid, within the second chamber, urges a piston to slidably move within the second cylinder toward the direction opposite the first chamber. A third chamber is defined by the second cylinder and the piston to include a restoring means for urging the piston toward the first chamber to return the expelled damping liquid to the first chamber after the damping or removal of the impact force such that the impact absorber may dampen successive impact forces.
REFERENCES:
patent: 3801087 (1974-04-01), Akaike et al.
patent: 3834686 (1974-09-01), Moritz et al.
Aisin Seiki Kabushiki Kaisha
Marbert James B.
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