Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1994-01-19
1995-08-08
Denion, Thomas E.
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
403381, F01B 2526
Patent
active
054389119
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention concerns pneumatic control devices with a control cylinder fitted with signal, ie control switches for scanning in contactless manner the position of the control piston. Foremost the invention relates to those control devices of the cited kind which are fitted with a control cylinder comprising at its outside switch-means, especially so-called reed switches or the like, that can be controlled magnetically or electronically by the piston of said cylinder or by components connected to it, said switches opening or closing electrical circuits as soon as the piston reaches a predetermined position.
STATE OF THE ART
Such reed switches as a rule are mounted in a housing with guide elements by means of which the housing can be displaced inside a guide on the cylinder outside to allow setting and adjusting the housing's position relative to the cylinder and thereby relative to movable control piston. Such guides and guide elements are practical in the so-called dovetail design, allowing the dovetailed guide elements of the reed-switch housing to be inserted in dovetailed guide grooves matching the two end sides of the reed-switch housing. As long as the control cylinders are fitted with only one switch, this design will not entail substantive shortcomings. However if two or more signal or interrogatory switches are required to adjust the control piston, where the position of the switches must be accurately adjusted relative to the control cylinder, then as a rule if one of these switches were to fail, it will have to be disassembled together with the other switches and all must be reinstalled and readjusted again in their positions.
DISCUSSION OF THE INVENTION
The object of the invention is a control cylinder for pneumatic controls, foremost as regards devices to hold and guide the housing of a signalling or interrogatory switch, namely a design free of such shortcomings and in particular allowing the insertion or exchange of the housing into a dovetailed guide groove of the control cylinder without thereby requiring changing the position of other control or signal switches or their housings.
This problem is solved by the invention by a special design of the guide elements at the housing of the reed switch, the cross-section of the substantially trapezoidal guide rail of the switch housing evincing a shape deviating from the trapezoidal cross-section of the associated guide groove of the control cylinder, both elements, ie the rail and the groove, evincing substantially the same height or depth, but the width of the guide rail at the side adjacent to the switch housing being less than the gap width of the guide groove at its open side, the overall width of the guide rail being shortened on one side by an extent determined by a circle around the edge at the narrow side of the guide rail and of a radius at most equal to the width of the gap of the guide groove, the spacing of the other edge at the narrow side of the guide rail from the diametrically opposite outer edge of the guide rail exceeding the width of the guide groove.
To facilitate insertion of the guide rail of the switch housing into the guide groove of the control cylinder, the height of the guide rail preferably shall decrease toward the unreduced side of the dovetail. Moreover the slope of the side surfaces of the dovetail may deviate from that of the adjoining surfaces of the guide groove, in particular it may be made less. Illustratively for an angle of about 60.degree. between the side surface and the bottom surface of the guide groove, the corresponding angle of the guide rail may be about 45.degree..
SHORT DESCRIPTION OF THE DRAWINGS
The invention is elucidated below by an illustrative embodiment shown on a much enlarged scale for the sake of comprehensiveness in the drawing with all its essential parts, namely the housing blank for the switch together with the adjacent parts of the control cylinder supporting it.
The drawing denotes the control cylinder by 11. A substantially dovetailed channel 12 is present
REFERENCES:
patent: 3577316 (1971-05-01), Piette
patent: 4447171 (1984-05-01), Baldoni et al.
patent: 4504168 (1985-03-01), Miller
patent: 5222826 (1993-06-01), Hanke
patent: 5335587 (1994-08-01), Stoll
Fiedler Reiner
Supanz Johann
Denion Thomas E.
Numatics GmbH
PWB AG
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