Spring devices – Fluid – Expansible-contractible chamber device
Patent
1993-04-27
1996-06-25
Oberleitner, Robert J.
Spring devices
Fluid
Expansible-contractible chamber device
267 69, 92 92, 254 93HP, F16F 500, F16J 300
Patent
active
055292933
DESCRIPTION:
BRIEF SUMMARY
The present arrangement relates to an arrangement of elongate, hollow pulling means, which is provided at opposite ends with fastening means for fixing of the pulling means between two opposite fastening points and at the one end is provided with a pressure medium-supply conduit, which is connectable to a source of pressure medium via a pressure regulating arrangement, and the pulling means being adapted, on actuation of the pressure regulating arrangement, to exert a regulatable pulling force between the fastening points.
-DE-A-2 21 06 516 describes a pulling means which uses a flexible lifting means, i.e. an elongate hollow pulling means provided by a single flexible tube. The pulling effect is caused by inflating the tube by means of compressed air. The suggested tube is provided with a specific reinforcement, in order to operate in controlled manner as intended. This means that a high amount of the power of the compressed air which is supplied to the pulling means is being used to radially expand the reinforced flexible tube. Accordingly, the available lifting power is correspondingly reduced in practice due to the use of reinforcement means.
Accordingly it is an object of the invention to provide a relatively simple pulling menas which can be retracted in the longitudinal direction with a minimum of work.
It is another object of the invention to provide pulling arrangement employing a series of inflatable covers which do not require support means when inflated.
Briefly the invention provides a pulling arrangement which is made of a series of mutually defined cross-sectionally wide hollow space-forming covers which are mutually communicating through intermediate transition portions. The pulling means is made of flexible, relatively non-elastic wall material and the covers are manufactured with relatively small wall thickness and relatively large volume, whereas the transition portions are manufactured with an increased wall thickness and circumferentially constricted shape. The pulling means between each pair of covers defines a rather rigid transition portion and a relatively shape-stable support for the associated covers.
According to the invention one has consequently been able to limit the wall material of the pulling means to a cover, which encloses the hollow space sections, and constricted transition portions, which connect the covers to each other. In other words, the pulling means is made of a series of mutually defined and mutually communicating covers, which are defined in pairs by means of the intermediate, constricted transition portions. By this one has the possibility to effect sideways expansion of and longitudinal contraction of the pulling means exclusively via the covers and independently of the transition portions. In other words, one has the possibility to exert a contraction of the pulling means in a controlled manner exclusively in the regions where the covers are located, while the relatively shape-stable transition portions exclusively form connection between the covers and transfer the pulling forces between them.
In contrast to a structure as described in DE-A-2106516, the series of hollow covers is able to retract in their longitudinal direction without the need of support means when they are inflated in order to limit the amount of power used for compressed air or other inflating medium which is used to radially expand the pulling arrangement.
The pulling means according to the invention has application in a series of different areas both in connection with hauling and putting out of an object and in connection with lifting and lowering of an object. The present invention also relates to a use of the pulling means as a resilient pulling means, wherein the resilience characteristic of the pulling means is regulated by regulating the pressure of the pressure medium which is supplied to the pulling means.
The characterising features of the pulling means as a resilient pulling means are that the pulling means is inserted between two parts in a wire, chain or the like, in a tens
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Oberleitner Robert J.
Schwartz Chris
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