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Telescoping Air Cylinder

IP.com Disclosure Number: IPCOM000036760D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Spoor, TW: AUTHOR

Abstract

Disclosed is a device wherein an air cylinder piston can be extended to many times the overall height of its cylinder chamber, and subsequently retracted completely into said chamber.

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Telescoping Air Cylinder

Disclosed is a device wherein an air cylinder piston can be extended to many times the overall height of its cylinder chamber, and subsequently retracted completely into said chamber.

The basic piston design, shown in the figure, allows each piston to travel the overall length of the chamber cavity (X dimension) minus the piston base length (Z dimension). As each intermediate piston has identical dimensions for both X and Z, and the internal bore of a given intermediate piston is the chamber for the next piston, it can be seen that each piston will travel this distance, thus enabling the total stroke to far exceed the overall height of the cylinder chamber.

The total stroke can be formulated by multiplying the number of pistons by the X-Z dimension.

It should be noted here that, for simplicity, the figure shows only a single intermediate piston and an inner piston. However, it is, of course, possible to use many more intermediate pistons to obtain the required stroke. This is made possible, in part, by the use of two sets of double "O" rings on the outer walls of both the chamber and the piston base, which virtually eliminates any danger of the pistons tilting and jamming.

A system has been built utilizing 4 intermediate and 1 inner piston whose total stroke is in excess of 3 times the actual height of the cylinder chamber.

The retract cycle is obtained by means of simple valving, whereby when retract air is applied to the outer piston, i...