Apparatus and method to cushion movement of a member

Details Apparatus and method to cushion movement of a member Apparatus and method to cushion movement of a member

1993-08-02

1994-08-23

Butler, Douglas C.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

18832217, 18832218, 18832221, 188269, 267119, 267130, F16F 902

Patent

active

053399323

ABSTRACT:
An apparatus to cushion movement of a member in a machine includes a piston which divides a cylinder into upper and lower variable volume chambers. A body of lubricating liquid is held in a chamber in the piston. Lubricating liquid is conducted from the chamber in the piston to an annular space between upper and lower seals on a head portion of the piston. During reciprocation of the piston, the lubricating liquid engages the inner side surface of the cylinder. In addition, the lubricating liquid conducts heat away from the cylinder. Fluid pressure is applied against upper side surface of the body of lubricating liquid in the piston chamber by gas pressure conducted from a chamber of the cylinder. During assembly of the apparatus, the piston is inserted part way into the cylinder and a space between seals on the piston is partially filled with lubricating liquid. The piston, with the lubricating liquid between the seals, is fully inserted into the cylinder. In addition, the chamber in the piston is partially filled with lubricating liquid.

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patent: 5220820 (1993-06-01), Terrell et al.

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