Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electrical power distribution systems and devices
Patent
1995-08-09
1997-11-04
Scott, J. R.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electrical power distribution systems and devices
200296, 248 271, H02B 104, H05K 500
Patent
active
056846703
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a control switch and/or signaling unit with a collar or flange which has a cylindrical part, and with a holder.
Control switches and/or signaling units of this kind, which are mounted to a mounting hole of a fitting plate by means of a holder slid onto the collar, are known (see Telemecanique catalog G01, April 1975, e.g. model XBF-Z1). Here the holder has an opening with internal threads, and can be screwed onto the cylindrical part of the collar which is equipped with corresponding external threads. The holder also has a pressure plate, displaceable axially with respect to the cylindrical part, which is pressed against the fitting plate to mount the collar. This is done by means of a toothed ring which is rotatable by means of a shaft, mounted off-center, with corresponding teeth, and which is equipped with a helix segment. This rests at least partially on a further helix segment of a counterelement. The ring is displaced upon rotation, in accordance with the pitch of the helix segments, in the axial direction, carrying the pressure plate along. The actuator of the control switch is screwed, from the front, onto a holder introduced from the back through the opening of the fitting plate. One-person fitting of the control switch is therefore not possible if the fitting plate is a larger front panel.
It is also known, for the mounting of control switches, to join them to a holder by means of a slide lock fastener (see DE 77 12 822.4). Here again, retention of the actuator during fitting is required because of the rotational entrainment effect when the holder is snapped into place. A further disadvantage is the cumbersome adaptation to the thickness of the fitting panel, which according to DIN standards can vary from 1 mm to 6 mm. Adaptation is accomplished, from the back, by means of two screws located opposite one another on the edge of the holder. The two screws are screwed in, in alternating steps, until they press against the fitting panel. Because of the single-point pressure that this produces, it is possible with thin front panels, made for example of plastic, for an impression to be created or even for the fitting panel to be damaged. The same disadvantages also occur with control switches having snap connections, in which a holder with elastic snap elements is snapped into place (see EP 03 30 956 A1). Here again, the actuator must be retained during fitting so that it is not pushed out by the holder as it is snapped into place. Single-person fitting is equally impossible with the ring nut mounting method (also known) for control switches. Here again, the actuation element must be held from the front so the ring nut can be screwed on from the back for mounting purposes. Thin front panels require a protracted screwing-on operation, for which moreover a special socket wrench is usually required.
In the case of fitting from the front with snap lugs (see DE 31 45 070), lugs which press against the front panel under spring pressure are released by pressure or twisting after the actuator is pushed on. Here again, however, adapting to different front panel thicknesses requires considerable effort or is possible only to a limited degree.
Substantially improved control switch mounting is achieved by a holder according to Utility Model G 91 09 678.2. With this, the control switch and/or signaling unit can be quickly and simply fastened to a variable-thickness fitting plate by means of an opening present therein. This holder represents the most obvious prior art for the present invention, and will be described below for better understanding of the invention.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to create a control switch and/or signaling unit of the aforesaid type that can be quickly and easily mounted to a variable-thickness fitting plate by means of an opening present therein.
The invention provides a control switch and/or signaling unit of the aforesaid type in which almost double the thickness of fitting plates can be cov
REFERENCES:
patent: 4899252 (1990-02-01), Birzer
Telemecanique Katalog G 01, Apr. 1975.
Birzer Josef
Herdegen Reinhard
Kreutzer Rainer
Zimmermann Rudolf
Scott J. R.
Siemens Aktiengesellschaft
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