Fastening device for actuating cylinders

Expansible chamber devices – With support or frame

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Details

92128, 2483165, 248 744, F01B 2900

Patent

active

052379094

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a fastening device for actuating cylinders, provided with at least two stringers situated at a maximum of 90.degree. from each other in a circumferential direction. The fastening device includes a fastening yoke, circumferentially surrounding the cylinder tube of the actuating cylinder and having at least two opposing clamping portions, which can be pulled together with the aid of a clamping screw for clamping the fastening yoke in a desired axial position along the cylinder tube.
The fastening device is intended to be used for actuating cylinders provided with stringers of the form of tie rods extending externally to the cylinder tube and keeping together the end walls of the cylinder tube, as well as for actuating cylinders provided with stringers comprising longitudinal beads formed integrally with the cylinder tube.
A problem occuring in the use of fastening yokes which are clamped circumferentially round the cylinder tube is that the large clamping force required to securely maintain the yoke in the set axial position along the cylinder tube causes deformation of the cross-sectional configuration of the cylinder tube. Such a deformation may in turn cause the piston to stick or even get locked in the cylinder bore.


SUMMARY OF THE INVENTION

The object of the invention is to enable secure fastening of the fastening yoke without accompanying deformation of the cylinder tube, particularly the internal cylindrical surface of the tube. Further objects are to achieve a simple and easily handled device while avoiding engagement with sharp edges which can give permanent deformations in the mating surfaces in question. Accordingly, the device shall allow repeated fastening in desired axial positions, i.e. continuously along the entire cylinder tube and not only in certain, specific positions.
These objects are achieved by a fastening device including a fastening yoke having two opposing clamping portions. Each opposing clamping portion has an outer side engaging portion configured to engage one of the outer sides. The clamping portions are clamped together, preferably with screws. A pair of clamping blocks is positioned between the pair of opposing clamping portions with each clamping block engaging one of the opposing clamping portions at outer portions of the clamping blocks. The pair of clamping blocks are pivotally mounted about engagement regions disposed radially inward with respect to the outer portions. Each clamping block also includes an inner portion configured to engage the inner side of one of the stringers so that when the opposing clamping portions are clamped together, the outer side engaging portions engage the outer sides of the stringers and the inner portions engage the inner sides of the stringers. This fastens the device to the actuating cylinder with a clamping force on the stringers and minimizes deformation of the actuating cylinder.
The fastening yoke is clamped exclusively against the stringers, and therefore, does not exert any notable clamping force on the cylinder tube. The clamping forces are instead applied to the "outer" and "inner" side portions of the stringers. The terms "outer" and "inner" are here used in relation to the dimension in the circumferential direction in the region for an associated clamping screw, e.g. approximately to the linear extension of the clamping screw between the opposing clamping portions of the fastening yoke. In the case where the stringers are beads integral with the cylinder tube, the clamping forces are applied substantially in the circumferential direction from opposing directions towards the respective bead, and thus the clamping forces substantially counteract each other. If, as disclosed in claim 7, the opposing clamping surfaces are mutually parallel, radial force result either.
An essential aspect of the invention is that the clamping screw can be tightened with a large force without both associated stringers (i.g. tie rods or longitudinal beads) being subjected to a corresponding for

REFERENCES:
patent: 1049204 (1912-12-01), Bushnell
patent: 4700616 (1987-10-01), Stoll et al.
patent: 4802646 (1989-02-01), Cattani
International Search Report PCT/SE90/00617, mailed Dec. 28, 1990.
PCT International Preliminary Examination Report, PCT/SE90/00617, completed Dec. 1991.

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