DE2001188A1 - Magnetically operated switching device and method for its manufacture - Google Patents

Description

Magnetically actuated switching device and method for its manufacture The invention relates to magnetically actuated switches with tongue contacts, in particular a reed switch device in which a plurality of reed switches are arranged are, which are run over by a magnet one after the other, and also on a Method of making such a switch.

The purpose of the present invention is to provide a reed switch device to create, in which a follow-up contact is achieved.

According to a further development of the invention, a reed switch device is intended be created in which the switches are denser than before next to each other are arranged.

Furthermore, according to the invention, a reed switching device is to be provided become, with which reed switch from far indentation ..

and drop .. ampere turn tolerances can be used to create a close switching ratio from marking to distance to it ..

keep.

According to the invention is a magnetically actuated Schaltsorw direction provided with a plurality of switches, each with a pair of magnetic actuatable contacts is provided, which are passed over by a magnetic switching arm in which shielding means are provided between adjacent switches, to avoid the magnetic flux from the Remove the contacts of one switch and onto the contacts of an adjacent switch to steer.

According to a development of the invention, the switching device contains a plurality of magnetic reed switches which are arranged to can be overridden by a rotatable switch arm equipped with a magnet, and which is provided with a wire spacing member which is connected between adjacent Reed switches are organized.

Furthermore, the switching device according to the invention includes a plurality of magnetic reed switches, which are arranged in a cylindrical shape eo, that they are run over by a magnet arranged on a spindle, and the Wire shielding members between adjacent switches as in the one mentioned above execution are arranged.

According to a development of the invention, in addition to the magnetic Shielding the switch contacts an electrostatic shield in the form of a arranged around the tongue contacts around the corded copper shield is provided.

The invention is shown in the drawing, for example.

Fig. 1 is a plan view of part of the switching device.

FIG. 2 is a section along line 2.2 in FIG. 1.

Fig. 3 is a plan view of the complete SchaltvorZ direction.

FIG. 4 is a section along line 4-4 of FIG.

Figure 5 is a section along line 5.5 of Figure 3.

Fig. 6 is a section through a cylindrical switching device.

FIG. 7 is a section along line 7-7 of FIG. 6.

In the figures 1. 5, the switching device has a plurality of Reed switches 1, which are arranged so that they are of a rotatable switching arm 2 are driven over and scanned. The switching arm 2 is on a shaft 3 (Fig. 4) arranged and provided with a magnet A. A shield C made of iron wire is between adjacent reed switches, such as in Figure 1 arranged between the reed switches B and D. The reed switches are arranged on a board 4 with a printed circuit, as shown in FIG and the ends 5 of the wire C pass through the plate 4 between the contacts from neighboring switches, i.e. between switches B and D.

If during operation of the scanning arm 2 is arranged in such a position angel is that the magnet A is directly above the reed switch B in Figure 1, a Magnetic flux on the reed switch to close the contacts 6 and 7 to be supplied. When the magnet A on the arm 2 on the tongue ..

Switch B turned in the direction of the adjacent reed switch D. becomes, the magnetic flux from the reed switch D becomes the magnetic shield C deducted. The shield C is made of iron wire, and the coercive force or the remanence is practically zero and the switching contacts open in the absence of magnetic flux from magnet A. If arm 2 continues to rotate, the magnetic flux is drawn to the adjacent reed switch D and effected a closing of contacts. The state remains until the magnet turns approaches the next wire shield, thus pulling flux away from switch D. and allows the contacts to be returned to the normally open condition. That on top of each other.

The following opening and closing of the contacts is made possible by the switching continue with the scanning sequence.

The insertion of magnetic wire shields between adjacent The device has a quick change in the flow concentration via the switches into the one from the magnetic switch arm.

driven reed switches while without the shields there is a greater flux density decay in each reed switch. Without the shields, that is the motion differential or the closed gap of the magnetic path with reference to the contacts of the reed switch due to the decay effect the magnetic flux is quite large, while with the shields a fast one Change in the flux density is achieved, which is a minimal Bewegungsw differential or gives a closed space. The invention permits its use of reed switches with wide "pull-in tw and -" drop "- ampere turn tolerances, in order to obtain a close marking / distance switching ratio and a follow-up contact actuation the switch to ensure.

It is now believed to be a preferred method of making one Series of circuits with magnetic and electrostatic shielding for each one Switch will be described0 such a preferred manufacturing method avoids the need for soldering the electrical connections and simplifies that Maintenance as this can be done without the use of special tools can.

A plug-in facility for the reed switches is provided.

The special design results in savings in manufacture.

position by reducing individual parts and labor costs.

This is achieved by providing molds made of plastic material which are then copper-plated by electroplating. In practice it serves this copper plating as a metallic one Skin which is grounded and thus provides an electrostatic screen. Such a switch design is to be described in connection with FIGS. 3, 4 and 5.

The reed switches 1 are within an inner and outer housing 10, 11 arranged, which contain recesses 12, which when assembling the Housing spaces 13 form and a shielded bearing for each reed switch 1 provide.

The dimensions of the cavities 13 are such that a floating Seat for the reed switch 1 results which allows them to be their natural Take position when they finally hit the board 4 with the printed circuit board be pressed. The outer end of each cavity 12 is fluted provided at 14 and forms a two-way snap-in bracket for the reed switch 1.

The outer housing 11 also contains additional recesses for Housing the magnetic shielding wires C. There are also internal and external Grooves provided in the fitting, in which pressure rings are arranged, which Provide lateral biasing of the reed switch terminations to provide a good electrical Ensure contact with the printed circuit board and a colector ring Cavity 15 in the middle of the housing does not take a frame.

put up the middle Kolektorring, and all of the switch contacts Collected signals passed over the Kolkturring and outwards over an isolated one Head fed.

The Kilektorring can be electrostatically shielded by means of a copper skin be- which on the inner and outer housing part 10, 11 is deposited is.

The contacts of switch 1 are operated by magnet A, which is attached to the rotating arm 2. To the margin or the distance between To reduce the size of the magnet and the switch, the outer housing 11 is on the outer surface except and forms an annular groove 16 in which magnet A rotates.

After assembling the two housing parts 10, 11, before which the magnetic shields C, the pressure rings and the Kilektorw ring are inserted, the reed switches 1 are inserted into their individual cavities by snapping them into place, in which they are pushed past the flashlight throats 14. The compilation is now ready for installation in a layered arrangement of panels with printed Circuits finished which is cut in with a large center hole which the reed switch device is arranged. The reed switches c.

conclusions are firmly against the circuit board 4 by means of suitable Clamping contact pieces are pressed and the pressure is exerted by the inner and outer pressure rings controlled.

In the embodiment according to Figures 6 and 7, the reeds are switches 1 around the interior of a cylindrical housing 20 and the magnet A is inserted into a rotor 21 arranged on a spider 22. Iron wires C form the magnetic shield, and the walls of the housing - 0 and the rotor 21 - are clad with copper to form the electrostatic shield.

An extension or extension 23 of the housing 20 is at 24 with provided with an external thread to enable the switching device on a Control panel is arranged. Spring-loaded stop means 25 are for the rotor 21 provided for setting the magnet and rotor to a specific switching position to enable. The extension 25 has a fiber-loaded ball, which in any of a plurality of grooves 26 in the housing 20 can engage.

Various changes are possible within the scope of the invention.

For example, although the ends of the wires are ab ..

shield wires are shown in the drawings as if they protrude through the printed circuit board, between the switches in each Conveniently arranged and the wires can be straight and glued or otherwise attached to the plate. Although in the same Way described a rotating device of switches in connection with a magnet rotor and as shown, the switches can also be ordered in a linear array ant be.

Claims (2)

P a t e n t a n s p r u c h e 1. Magnetically be operable switching device with a plurality of Switches, each of which is provided with a pair of magnetically operable contacts which are passed by a magnetic switching arm, characterized in that that shielding means (C) are provided between adjacent switches (1), m at Process by the magnetic switching arm 12,213 the magnetic flux from the To pull the contacts of one switch off and to the contact of an adjacent switch to steer. 2. Switching device according to claim 1, characterized in that Each switch (1) consists of a reed switch, which is arranged in such a way that that they are driven over by a rotatable with a magnet (A) understand switching arm (2) and are scanned, and an iron wire (C) as a shielding means between the neighboring ones Switches (1) is arranged. 3.: Switching device according to claim 1 or 2, characterized in that that an electrostatic shield in the form of a grounded copper shield around the switch (1) is provided 4. -Schaltvorrichtun, g according to claim 1, characterized in that the switches are spaced around the inner circumference of a cylindrical housing (20) are angeor.dnet, the magnetic switching arm an in a rotor (21) contains a magnet A inserted which is arranged on a spindle (22) is and the switch (1) runs over, and iron wires <0) between neighboring Switches are arranged to form a magnetic shield. 5. Switching device according to claim 4, characterized in that the walls of the housing (20) and the rotor (21) with copper to form an electrostatic Shield are plated. 6. Switching device according to claim 4 or 5, characterized in that that an extension (25) is arranged between the rotor (21) and the housing (20) and the setting of the magnetic switch arm to any desired switch position enables. 7. A method for manufacturing a switching device according to claim 1, characterized in that a pair of molded pieces (10.1) made of plastic each with radial depressions (12) with the formation of cavities (13) for the switch (1) provided, a groove (14) is provided at the outer end of each cavity and additional radial indentations in a molding between the indentations (12) to be provided for the sub-funding of the shielding funds.