Adjustable Stroke Hydraulic Cylinders, Indian Manufacturer, Indian Supplier,Indian Exporters
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Adjustable Stroke Hydraulic Cylinders
Adjustable Stroke Hydraulic Cylinders


An adjustable stroke cylinder often is used with adjustable piston. An adjustable stroke piston and cylinder combination including a piston fixed to one end of a piston rod that extends from one end of the cylinder, and an auxiliary piston is in sealed engagement with the cylinder means and the piston rod and is slidable on the piston rod.

A simple and reliable hydraulic or pneumatic cylinder is provided with an axially adjustable internal head which permits highly accurate selective variation of the stroke of the cylinder piston. A piston-cushioning device is carried by the adjustable head and can be regulated independently of the stroke adjustment to control the cushioning of the piston at the end of its stroke. In many applications employing pneumatic or hydraulic cylinders, it is necessary to adjust the length of the stroke of such a cylinder in accordance with different operating requirements. Another highly desirable feature of many conventional hydraulic or pneumatic cylinders, is the provision of a cushioning device which gradually retards the movement of the piston as it approaches the end of its stroke and which preferably is adjustable so that this cushioning effect can be regulated in accordance with different loads and operating pressures. In some cases, the effective stroke of a cylinder is reduced simply by means of an adjustable blocking member on the piston rod, but such an arrangement either sacrifices the aforementioned cushioning effect or requires the use of an elaborate valving system to achieve that feature. Furthermore, in pneumatic systems or other related systems employing a compressible working fluid, any arrangement for shortening the stroke of the piston without decreasing the volumetric capacity of the cylinder can be very inefficient. Accordingly, various adjustable stroke cylinders have previously been devised in which the stroke adjustment has been accomplished by axially moving a cylinder head or by changing the effective axial length of the piston itself. In general, however, the stroke adjusting means heretofore employed in such variable stroke cylinders have either entirely precluded the inclusion of adjustable piston cushioning means or have provided that feature only at the expense of very complicated and expensive mechanisms.

In accordance with the present invention a simple and reliable hydraulic or pneumatic cylinder is provided with an axially adjustable internal head which permits highly accurate selective variation of the stroke of the cylinder piston and which also is provided with an adjustable cushioning device that can be regulated independently of the stroke adjustment to control a cushioning of the piston at the end of its stroke. Various means for practicing the invention and other advantages and novel features thereof will be apparent from the following detailed description of an illustrative preferred embodiment of the invention, reference being made to the accompanying drawings in which like reference numerals denote like elements.



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Adjustable Stroke Hydraulic Cylinders, Indian Manufacturer, Indian Supplier, Indian Exporters