Expansible chamber devices – Fluid conduit or port in fixed wall of working chamber
Reexamination Certificate
1999-11-12
2001-10-16
Ryznic, John E. (Department: 3745)
Expansible chamber devices
Fluid conduit or port in fixed wall of working chamber
Reexamination Certificate
active
06302012
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to an arrangement for the supply of pressure medium to a hydraulic or pneumatic cylinder. In hydraulic and pneumatic cylinders, the supply of pressure medium is usually carried out by means of pressure medium lines which are connected to the heads of the cylinders. In the vicinity of the heads of the cylinder, there is usually a sufficient wall thickness for receiving standardized connection threads for pressure medium lines. Such a cylinder for hydraulic pressure medium is represented, for example, in the company document RD/E/F 17 032/08.98 “Hydrozylinder/Hydraulic Cylinder/Vérin Hydraulique—Type CDT3/CGT3” from Mannesmann Rexroth AG, in particular on pages 1/42, 40/42 and 41/42. The axes of the connection threads are perpendicular to the longitudinal direction of the cylinder. If the pressure medium lines are to be arranged parallel to the longitudinal direction of the cylinder, angular elements are necessary for the reversal of direction. Because of the minimum radii which have to be complied with here, it is difficult, if not even impossible, to conduct the pressure medium lines along right next to the casing of the cylinder. There is a further problem in hydraulic and pneumatic cylinders of small size. In them, the wall thickness of the casing is so small that it is no longer sufficient for standardized connection threads. Secure attachment of the pressure medium lines is not necessary in these cases.
SUMMARY OF THE INVENTION
The invention is based on the object of providing an arrangement for a reliable supply of pressure medium even in cylinders of a small size in which the wall thickness of the casing is not sufficient for standardized connection threads for the attachment of the pressure medium lines.
The arrangement according to the invention makes it possible to conduct the pressure medium lines right next to the casing of the cylinder. The flattening of the casing of the cylinder which is provided for the bearing of the connection plate can be manufactured easily.
The detachable connection between the casing of the cylinder and the connection plate makes it possible firstly to attach the pressure medium line to the connection plate and only afterward to screw the connection plate (with the pressure medium line attached to it) to the casing of the cylinder. Given a rectangular base surface of the bearing region it is possible to arrange the connection plate in two positions which are turned through 180°. Given a square base surface of the bearing region of the connection plate in conjunction with the four screws which are arranged in the corners of the square base surface it is possible to arrange the connection plate rotated in each case through 90° where necessary. The direction of flow of the pressure medium is already deflected in the connection plate by means of ducts which are arranged perpendicularly to one another. Thus, external angular elements between the cylinder and the pressure medium lines are dispensed with. Two pressure medium lines can be conducted one next to the other if the connection plate projects beyond a rectangular base surface on one side, and the connection for the pressure medium line is arranged on that part of the connection plate which projects beyond the rectangular base surface, in such a way that the port for the pressure medium line is arranged perpendicularly with respect to the longitudinal direction of the connection plate. By virtue of this measure, the port for the pressure medium line is arranged parallel to the longitudinal direction of the cylinder. If the port for the pressure medium line is embodied as a connection nipple, the pressure medium line can be attached to the connection nipple by means of a press-fit connection. Such a connection requires little space. There is sufficient space available for the tool required for the press-fit connection if the pressure medium line is already attached before the screwing of the connection plate to the casing of the cylinder. In order to simplify the fabrication of the connection plates provided with the connection nipple in comparison with a one-piece embodiment, the connection plate and the connection nipple are fabricated separately and both parts are held together by a screwed connection. In order to increase the mechanical strength of the screwed connection—in particular in the case of small wall thickness′—part of the connection nipple is embodied as a cylindrical bolt, guided through a bolt in the connection plate and secured by means of a screwed connection which is supported on two side faces, one opposite the other, of the connection plate. This embodiment makes it possible to mount the connection nipple on both sides of the connection plate as desired. A chamfer in the connection plate in the vicinity of the outlet opening of the hole serves as an abutment and antitwist protection for the connection nipple.
REFERENCES:
patent: 2953118 (1960-09-01), Flick et al.
patent: 2978283 (1961-04-01), Rosen
patent: 4860638 (1989-08-01), Hosono et al.
patent: 4878419 (1989-11-01), Vick
patent: 5094143 (1992-03-01), Andersen, Jr.
patent: 399046 (1924-07-01), None
patent: 2939422 (1981-04-01), None
RD/E/F 17 032/08.98 Hydrozylinder/Hydraulic Cylinder/Vérin Hydraulique TYP CDT 3/CGT, from Mannesmann Rexroth AG, pp. 1/42, 40/42 and 41/42.
Dantlgraber Jorg
Fröhlich Udo
Farber Martin A.
Mannesmann Rexroth AG
Ryznic John E.
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