Importance

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Abstract

A vibration snubber for earthquake protection of piping including an auxiliary cylinder axially slidable in a main cylinder having a large diameter portion. The large diameter portion houses a flywheel which is secured to a rotatable center shaft. One end of the shaft is mounted in a bearing in the cylinder end. The other end is threaded and screwed into a conventional screw nut fixed on one end of the auxiliary case. A spacing collar is provided between the flywheel and the bearing. The inner end surface of the large diameter portion has a chamferred friction bearing surface. A movable wheel is rotatably and slidably mounted on the spacing collar. The movable wheel is cylindrical, concentrically surrounding the flywheel. A spring mounted between a spring-receiving ring on the movable wheel and a spring-receiving flange on the flywheel presses the movable wheel against the flywheel. An annular friction surface corresponding to the friction bearing surface is formed on the movable wheel surface facing the end of the main cylinder. At least one ball rides in corresponding conical recesses in opposing faces of the movable wheel and flywheel. When the movable wheel leads or lags the flywheel by inertia, the ball rides up on the surfaces of the conical recesses, pushing the movable wheel away from the flywheel, causing the friction surfaces to contact each other, thereby slowing the assembly by friction braking. The friction bearing surface axial position can be adjustable.

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First Claim