DE1190575B - Resonance reed relay - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

HOIh

German class: 21g -4/02

Number: 1190 575

File number: W 27812 VIII c / 21 g

Filing date: May 9, 1960

Opening day: April 8, 1965

The invention relates to electromagnetic relays, particularly resonant reed relays.

Such relays are used as normal components in special circuits and only speak to the frequency that corresponds to the natural frequency of the tongue. The tongue excited in resonance then closes a contact through which further control functions can be triggered.

Reed relays of this type with single reeds have certain disadvantages, which is why such reed relays are used already formed with two, similar vibrating tongues made of a magnetic material which, starting from a common restraint, run approximately parallel to one another and can be excited by a nearby solenoid. To make changes in the natural frequency to prevent, one has at least one of the two contacts attached to the vibrating tongues designed to be elastically resilient.

In a known relay of this type, however, the contacts are not at the ends of the vibrating tongues, but attached near the restraint. This arrangement has the disadvantage that for a predetermined contact distance is the path of the tongue ends required to touch the contacts must be chosen accordingly large. Accordingly, you also need one correspondingly large excitation current. Finally, the known relay also has the disadvantage that after When the contacts are touched, the tongue tips continue to swing and consequently the natural one Vibration of the tongues is interrupted.

It is true that a resonance reed relay has also become known in which the contacts are on End of the vibrating tongues are attached. In these known relays, however, there is no particularly good one Self-cleaning of the contacts takes place.

The invention is based on the object of the known resonance reed relays of the aforementioned Art to improve and in particular to create a simple and cheap construction in which the resilient contact is designed so that it disturbs the vibration of the tongue as little as possible and also has good self-cleaning properties.

According to the invention it is provided that the elastic contact as a U-shaped bracket from a elastic wire is formed, the legs of which, starting from the end of a vibrating tongue and at an angle running backwards, form an acute angle with this, while the mating contact one on the opposite The inside of the other tongue is fastened and extends in the longitudinal direction of the same Resonance reed relay

Applicant:

The Wurlitzer Company, Chicago, JIl. (V. St. A.)

Representative:

Dr. phil. A. Mentzel

and Dipl.-Ing. W. Dahlke, patent attorneys,

Refrath near Cologne, Frankenforst 137

Named as inventor:

Ira Morrison Laurien, Williamsville, N.Y.

(V. St. A.)

Claimed priority:

V. St. v. America May 11, 1959 (812 281) -

linear contact wire is, so that when the tongues swing the middle part of the U-bracket the linear Contact wire touches at approximately a right angle and scrapes itself as it continues to swing shifts along the same.

With such a resilient contact, which causes excellent self-cleaning, the Vibration of the tongues, with a professional choice of the strength and elasticity of the wire bracket, not impaired and thus the resonance frequency is not shifted during the oscillation. This contact bracket with the linear mating contact can not only be produced extremely easily and cheaply and attach, but also has a very small mass.

According to the invention it is further provided that the ends of the elastic contact on the rear Outside of the tongue carrying this contact, separated from the free end of the tongue, arranged and are attached there.

The invention is explained in more detail below with reference to the drawing in an exemplary embodiment. It shows

F i g. 1 is a perspective view of the resonance reed relay,

509 538/313

3 4

F i g. 2 shows a section through the relay along which the tongues 20 act together as a core

Line 2-2 in FIG. 1 or in FIG. 3, an electromagnet that turns this and the coil

F i g. 3 is a section along the line 3-3 summarizes. The magnetic circuit from one end of the

F i g. 2, pair of tongues to the other runs almost completely

F i g. 4 shows a perspective illustration of FIG. 5 through magnetically conductive iron or the like, namely

upper ends of the two together - through the side arms 44 and 45, the iron blocks 14

working tongues, and 18 and the permanent magnets 58 and 60. At the

F i g. 5 is a graphical representation of the unillustrated embodiment that desires wide pulling area with the well-known umpteen air gap between the north poles of the permanent tongue pairs and ίο magnets on one side and the opposite

F i g. 6 shows a corresponding illustration for a free tongue end on the other hand. If now a

Pair of tongues according to the invention. Alternating current is sent through the excitation coil,

In the case of the particular in FIGS. 1 to 3 shown - then at a certain point in time the th resonance reed relay 10 is located in the upper ends of the reeds act as north poles. Upper-lower part a screw 12, which probably mutually removes these poles of the same name by means of a block 14 15 If you want to push in iron and a disk 16 made of insulating material, they will be even stronger from the protrudes through and in a further block 18 of iron lying outside the north pole of the permanent magnets is screwed in. Both sides of the insulating disc repelled so that they approach each other and the 16 are in direct contact with the two iron contacts 22 and 24 touch each other. In one blocks 14 and 18, two tongues 20 made of spring steel ao the following time the upper tongue ends or another suitable magnetizable south pole. They want to be Poles of the same name elastic material attached. The tongues in turn repel each other; additionally they will at their upper ends contacts 22 and 24, via the still outside the north poles of the more is said below. both permanent magnets attracted. Consequently

Opposite the screw 12, the two tongues are 25, the upper tongue ends are bent apart

gene iso and the contacts 22 and 24 separated from each other by a spacer sleeve 26 made of insulating material.

lates. The screw is also opposite to the iron If then the magnetic polarity of the tongues

block 14 isolated by an insulating washer 28. is reversed again, the contacts are again

Brought into mutual contact at the lower ends of the clamped tongues. The togeth-

can be provided with holes solder lugs 30 or the like. 30 mendrück the two tongues is still through

be provided that amplifies the electrical connection of their natural oscillation when they

Tongues serve. through their rest position through from the spread

The relay 10 also has a sleeve 32 from Iso-position return, into which it is due to the permanent

lierstoff, which were brought to an excitation winding 34 with magnets. The initial, short one

Keys 36 carries, which extends through a magnetic polarization with the sleeve 35 in one direction

32 one-piece head 38 protrude and preferably not from to bend the tongues so far that

are wisely poured into these. The contacts on the coil touch each other. Rather, some are

there is a radial protrusion at the lower end - vibrations required until an out-

the flange 40. The sleeve of the coil has also set the vibration amplitude reaching

an axial bore 42 through which the two 40 cause the contacts to touch. If the

Tongues 20 protrude. The lower flange 40 of the excitation frequency is not about the natural frequency of the

Coil is on top of the two iron blocks corresponding to tongues, then there will not be an out-

14 and 18 attached and can train there in a suitable manner, reaching vibration amplitudes,

for example by gluing, set. which is sufficient to close the two contacts.

There are also two arms 44 and 45 made of iron 45. In the embodiment described, the hangs

intended. The arm 44 consists of a vertical oscillation frequency of the tongues not only of the

extending flat iron 46, the lower end of which in the natural frequency of the same. Rather, they practice

close contact with the iron block 18 and permanent magnets 58 and 60 a relatively strong

at its upper end on one side a force exerted on the tongues, with the result that the

angled arm 48 is provided, which vibrate laterally on the 5 ° tongues at a frequency that is somewhat from

Head 38 rests and with this deviates from its original natural frequency by a screw. the

50 is screwed. There is a corresponding frequency of this forced or semi-forced

the other arm 45 from a vertically running oscillation can still be changed somewhat as a result

Flat iron 52, which will be on the underside of the iron block 14, that the permanent magnets along their

stirs and from its upper end an angled 55 axis, d. H. i.e. transversely to the longitudinal direction of the

The arm 54 that extends laterally against the head 38 moves. Once the magnets are in the

and with this, for example, are brought into a correct position, they are in this

Screw (not shown) connected. by a suitable adhesive or the like.

In the head 38 of the bobbin 32 is a U-In F i g. 5 is the dependence of the

shaped transverse groove 56 is provided, in which two small, 60 excitation of the tongues required Amperewindungs-

circular cylindrical permanent magnets 58 and 60 attached number above the excitation frequency in a known

are graphed, each in contact with the arms pair of tongues. The contact

44 and 45 and on both sides of the upper ends of the area of the tongues is indicated by the hatched

Tongues 20 are located. The magnets are inserted in this way, face 62 is shown. The relay may be

that poles with the same name, for example the north 65, matched the number of ampere-turns through

pole, face. the ordinate 64 is indicated, are operated.

When the solenoid 34 has its connection, the frequency range of the response lines 36 is supplied with power and thereby excites a total of 1.5% of the nominal frequency 66.

Of course, the response range becomes narrower at lower ampere-turns and with higher numbers correspondingly wider.

It has now been shown that when the tongues 20 have fixed contacts, when they touch the same S, the apparent rigidity of the tongues increases; this has the consequence that the aforementioned response area 62 is followed by a holding area or pulling area 68, which is approximately 5 % of the nominal frequency in the example mentioned. If the excitation frequency falls within this pull range from the start, the relay will not respond. If, however, the tongues are already vibrating at a frequency within the response range due to excitation, then they will continue to vibrate even if the frequency is increased and finally shifted into the holding area. This property is of course undesirable.

In the present relay, the holding area is ao thereby reduced to an extremely small amount, that one of the two to the Tongues attached contacts elastically attached. For example, in the case of the FIG. 4 shown embodiment on one of the two tongues 20, a contact 22 is attached, by a in the center line of the Tongue is formed at its upper end soft or hard soldered or welded wire. This wire can be made of any suitable contact material and is rigid with its tongue tied together. In contrast to this, the mating contact 24 is designed as a U-shaped bracket, its horizontally extending cross piece 70 has a distance from its tongue 20 and the other tongue closer. On both sides of the cross piece 70 there are two upwardly projecting side arms 72, which are at 74 bent around the upper edge of the tongue 20 and guided downwards at 76 on the back of this tongue are. The lower ends of these downwardly guided retaining brackets 76 are at 78 with the rear welded to the tongue or soldered hard or soft.

The contact 24 is thus designed to be flexible, since both its two arms 72 can bend and the crosspiece 70 can bend slightly in the middle. A bend can also be made at the bent points 74, and finally the downwardly projecting parts 76 can be bent slightly from the rear side of the tongue, since the entire contact 24 is made from an elastic wire. Using such an elastic contact results in a mode of operation according to the graph in FIG. 6. Here the corresponding curves are provided with the same reference numerals as in FIG. 5, but with an additional index a to distinguish them. Here, too, the response range 62 α is again 1.5 % of the nominal value of the natural frequency 66 a when working at the working level 64 a . The holding area 68 α , however, is reduced to approximately 0.5% here. So this means a reduction in the ratio of 10: 1 and makes the hold area or pull area practically meaningless. While the introduction of vibrating tongues compared to individual vibrating tongues in tongue relays already brought the advantage of a reduced reaction on the clamping, a reduced shock sensitivity and an improved frequency stability, the described introduction of an elastic contact brings a further improvement of the tongue relays in the direction of a reduction or almost complete Elimination of the stopping area that adjoins the response area.

Claims (2)

Patent claims: 1. Resonance reed relay with two vibrating reeds of the same type made from a magnetic one Material with a predetermined natural frequency which, based on a common restraint, run roughly parallel to each other, as well as a magnet coil arranged near the tongues, which is traversed by an alternating current to excite the tongues, the frequency of which is approximately equal to the natural frequency of the tongues is, wherein at least one of the two contacts attached to the vibrating tongues is elastic is compliant, characterized in that the elastic contact is a U-shaped bracket (24) is formed from an elastic wire, the legs (72), from the end of the one Oscillating tongue (20) starting and running obliquely backwards, with this an acute angle form, while the mating contact (22) one on the opposite inside of the other Tongue is attached and extending in the longitudinal direction of the same linear contact wire, so that when the tongues swing, the middle part (70) of the U-bracket underneath the linear contact wire (22) touches an approximately right angle and scraping lengthways as you swing through the same moves. 2. tongue relay according to claim 1, characterized in that the ends (76) of the elastic Contact (24) on the rear outside of the tongue carrying this contact, from the free Tongue end deposited, arranged and fixed there. Considered publications:
British Patent No. 562461;
U.S. Patent No. 2471594;
Special print from »ETZ«, 78th year, issue A 21,
1957, pp. 768 to 771. 1 sheet of drawings 509 538/313 3.65 © Bundesdruckerei Berlin