US 2014/0318909 A1Published application

Shock absorber

AssigneeEAB Engineering AS

InventorHarald Bakke

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Abstract

A shock absorber for use in lowering heavy structures to the sea floor comprises a cylinder with a piston having a heavy piston rod. A plurality of channels extend from the bottom side of the piston to its top side, where the channels are closable by means of a valve body, which permits fluid movement up through the piston to a cylinder chamber above the piston, but not in the opposite direction. The cylinder chamber is provided with a plurality of exit nozzles having decreasing diameter in the direction towards the bottom of the chamber. When the piston rod impacts against its substructure on the sea floor, it will force the piston upwards in the chamber. The valve body will close the channels so that the water in the chamber has to escape mainly through the nozzles, thus giving the shock absorber the desired resisting force.

Claims10

Dependent claims

A shock absorber for use in lowering structures to the sea floor, the shock absorber comprising:

a cylinder with a piston arranged slidable therein, said piston having a piston rod configured to extend outward out of the cylinder,
wherein at least one chamber in the cylinder above the piston is fillable with water and is configured to control discharge of the water when the piston rod is subjected to an impact force that presses the piston inward into the chamber,
wherein the water is supplied to said chamber through a valve device having a one-way function in the piston,
wherein a lower end of the cylinder is closed around the piston rod by an end piece having a cavity,
wherein a lower end of the piston has a depending annular portion having a larger outer diameter that is smaller than an inner diameter of the cylinder, and wherein the annular portion may be received with a predetermined clearance in the cavity.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/298,607Filed 6 Jun 2014
Priority: NO 201116886 Dec 2011
Published: 30 Oct 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F16F 9/348
Special valve constructions ; Shape or construction of throttling passages: throttling passages in the form of annular discs or other plate-like…
F16F 9/49
Arrangements for providing different damping effects at different parts of the stroke: stops limiting fluid passage, e.g. hydraulic stops or…
E02B 17/024
With relative movement between supporting construction and platform: shock absorbing means for the supporting construction
F16F
Springs