US2486394A - Selective relay - Google Patents

Selective relay Download PDF

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Publication number
US2486394A
US2486394A US650052A US65005246A US2486394A US 2486394 A US2486394 A US 2486394A US 650052 A US650052 A US 650052A US 65005246 A US65005246 A US 65005246A US 2486394 A US2486394 A US 2486394A
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Prior art keywords
reed
relay
frame
pole
magnet
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Expired - Lifetime
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US650052A
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Eannarino George
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STC PLC
Federal Telephone and Radio Corp
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Standard Telephone and Cables PLC
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Priority to US650052A priority Critical patent/US2486394A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00Electromagnetic relays
    • H01H51/30Electromagnetic relays specially adapted for actuation by ac
    • H01H51/32Frequency relays; Mechanically-tuned relays

Description

Nov. 1, 1949.
G. EANNARINO 2,486,394
SELECTIVE RELAY Filed Feb. 25, 1946 GEORGE- EAN/V/l Rl/VO Patented Nov. 1, 1949 SELECTIVE RELAY George Eannarino, North Arlington, N. 1., assignor to Federal Telephone and Radio Corporation, New York, N. Y., a corporation of Delaware Application February 25, 1946, Serial No. 650,052
6 Claims. (Cl. 200-90) This invention relates to a relay suitable for use in selective signalling systems or more particularly to a selective signalling device for mobile equipment using a vibrating reed in the mobile receiver.
It is therefore an object of the invention to provide a relay having a vibrating reed which has a natural frequency of vibration and which is so constructed that it is responsive to signals having a frequency corresponding to the natural frequency of the reed. A further object resides in providing a relay with a fixed magnet having a vibration amplifying effect to permit the attainment of large vibration amplitude with very low energ zing power. Another object resides in the interchangeability of the vibrating reed to difierent natural resonant frequency to thereby cover a considerable range of resonant frequencies by changing the metal thickness of the reed.
Further objects will be apparent from the fol lowing description when considered in connection with the accompanying drawing.
The drawing shows a preferred form of the relay as an example in which:
Figure 1 is a longitudinal sectional view of the relay, certain elements being shown in elevation,
Fig. 2 is an end elevation of the left end of the relay of Fig. 1, and I Fig. 3 is an end elevation of the right end of the relay of Fig. 1.
In both Figs. 1 and 2, one of the solder tenninals of the relay has been omitted for simplicity of showing.
Referring to Fig. l of the drawing, the relay is formed of a U-shaped frame or housing I preferably consisting of a strip of non-magnetic metal, such as brass, of uniform thickness and width and having an inwardly bent end portion la, a straight side portion I b, a yoke portion I c, a sec-- ond straight side portion Id and a second inwardly bent portion Ie. The two side portions Ib and Id are each'provided with a longitudinal slot near the center thereof to receive a spool 2 carrying the relay winding or coil 3. The spool 2 is provided with a tubular core 2a of square section, Fig. 2, and a vibrating reed 4' of the relay is mounted to extend through the center of the square tube 2a.
The reed 4 is formed of two magnetic strips 4a and 4b preferably of soft iron and preferably riveted on opposite sides of a strip of spring brass or bronze or steel 40 which forms a hinge element.
The spring 40 is securely clamped between two blocks 5a and 5b of suitable insulating material, which are mounted between the two side arms Ib and Id -of the frame I. The two blocks 5a. and 5b are clamped together by means of a screw 9 which passes through aligned holes formed in the ends of the frame sides Ib and Id and through holes formed in the blocks 5a and 5b and through a hole formed in the spring member 40. A clamping nut I0 is threaded on the other end of the screw 9, with a spring washer II interposed. An insulating sleeve 8 surrounds the screw 9 and passes through the hole formed in the spring member 4c and is located in counterbores formed in the blocks 5a and 5b. This sleeve 8 serves to insulate the reed from the screw 9. The spring member 40 extends beyond the blocks 5a and 5b, and a terminal element 4d is secured to the end of the spring member 4c, Fig. 1.
A permanent magnet 6, preferably in the form of a round bar, is provided inside of the yoke portion to of the frame and is positioned between two pole pieces I and 1'. These pole pieces I and l are composed of magnetic material and preferably of soft iron and are formed in an L-shaped section. The ends of the magnet 6 are preferably received in circular sockets formed in the horizontal portions of pole pieces I and l, and the pole pieces and the magnet are locked within the frame by means of relatively thin and narrow extensions la and 7a formed on the pole pieces and extending through slots formed in the relay frame 5 near the ends of the yoke portion Ic. Locking of the parts together is secured by bending over the ends of the extensions as shown in Fig. i. The pole tips lb and lb of the pole pieces 5 and 'l' are spaced apart, and the free ends of the reed strips 4a and 4b extend into the space between these pole tips. The reed strip 4b is provided with a contact member 24 which is arranged to engage the end of a threaded contact stud l4 mounted in a hole formed in the frame side portion If). This stud is adjustable to and from the reed armature by threaded engagement with a bushing I2 which is insulated from the frame of the relay by means of insulating washers I 5 and an insulating bushing I6. The contact stud I4 is also provided with a pair of nuts I8 and I9 and a washer iii.
The terminals of the coil 3 are connected to a pair of terminals 23a and 23b mounted on the outer face of insulating blocks 5a and 5b respectively by means of hollow eyelets 22. The signal currents for operating the relay are supplied to these terminals 23a and 23b. The circuit to be controlled by the relay would for example include a source of low voltage and would be connected to terminal 4d on the reed 4 and to the contact stud I4. When the coil 3 is energized by alternating current, the free end of the reed strips 4a and 4b will be magnetized with one polarity during one alternation and will be attracted to the pole piece of opposite polarity, while during the next alternation the polarity of the reed strips will be reversed and they willbe attracted to the opposite pole piece. Thus, the free end of the reed tends to vibrate in synchronism with the alternating current supplied to coil 3. When the frequency of the current corresponds to the natural frequency of the reed, the amplitude of vibration of the reed will be sufficient to cause the reed piece 4b to remain in contact with the inner end of contact stud H for a substantial period of time during each cycle of vibration, and thus the relay responds selectively to a current of a predetermined frequency. By changing the natural frequency of the reed. as by substituting for reed strips 4a and 4b similar strips of greater thickness, the reed may be made sensitive to a different frequency.
An escutcheon pin 20 for-med of non-magnetic material is inserted in the face of pole piece I to prevent the reed strip 4a from coming in direct contact with the face of pole piece I.
It is thus clear from the foregoing that when an alternating current flows in the coil 3, the vibrating reed becomes magnetized in alternate directions. If on the positive half of the A. 0. cycle the free end of the reed becomes a north magnetic pole, it will be repelled by the north pole of the magnet and attracted to the south pole. For the negative part of the A. C. cycle the free end of the reed will become a south pole which is now repulsed by the south pole of the magnet and attracted by the north pole. If the frequency of magnetization of the reed by the coil is the same as the natural vibrating frequency of the reed, the latter will vibrate in the air gap and the vibration amplitude will increase until the reed contact point strikes the fixed contact. The vibration amplitude will then be the total of the distance between the contact and vibrating reed.
Due to the vibration amplifying effect of the fixed magnet the unit is capable of attaining large vibration amplitude with very low energizing power. This is particularly important in battery energized systems wherein the relay is controlled by a vacuum tube because high systems sensitivity can be obtained with relatively few tubes.
It is possible to change the natural resonant frequency of the vibrating reed to cover a considerable range of resonant frequencies by changing the metal thickness of the reed, by changing other dimensions of the reed, the weight distribution of the reed, the stiffness of the hinge spring or by other well known means. Also, although I have shown the reed as comprising two strips 4a and 4b, a reed consisting of a single strip may be employed.
By mounting the reed co-axially with the energizing coil as shown, a. relay whichis simpler to manufacture and which is more compact and lighter in weight than other types of selective relays can be obtained.
While I have shown a particular embodiment of my invention for the purposes of illustration and description, changes and modifications therein will be apparent to those skilled in the art without departing from the scope of my invention.
I claim as my invention:
1. A relay particularly for selective signalling comprising a frame, a resilient member insulatingly clamped at one end to said frame, a reed including two parallel strips of magnetizable material clamped at one end thereof to opposite sides of said member, the other end of said reed being free to vibrate, a permanent magnet secured in said frame adjacent said other end of said reed and having a pair of spaced pole pieces between which said reed vibrates, means for preventing said reed from coming into direct contact with the pole pieces of said magnet, and a coil secured in said frame positioned between said member and said means, said coil surrounding said reed and vibrating same in resonance with its natural period.
2. A relay particularly for selective signalling as claimed in claim 1, wherein said means for preventing said reed from coming into direct contact with the pole pieces of said magnet comprise a non-magnetizable material attached to the face of the first of said pole pieces of said magnet and with which material one of the strips of said reed cooperates, a first contact attached to the other of the strips of said reed, a second contact insulatingly attached to said frame adapted to engage said first contact when said reed is energized at its resonant frequency and adjusted to prevent said reed from striking the second of said pole pieces.
3. A relay particularly for selective signalling as claimed in claim 2, wherein said contacts are in contact for a substantial period of time during each cycle of vibration whereby the relay is responsive selectively to a current of a predetermined frequency.
4. A relay particularly for selective signalling as claimed in claim 1, wherein a tubular core is provided between said coil and said reed, said reed passing through said core with minimum clearance.
5. A relay particularly for selective signalling as claimed in claim 1, wherein said reed is of a magnetizable material having high permeability and low retentivity.
6. A relay particularly for selective signalling comprising a U-shaped frame, a pair of insulating blocks clamped between the open ends of said frame, a permanent magnet in the closed end of said frame, with its ends facing the sides of said frame, a pair of L-shaped pole pieces within said frame, the first portions of each of said pieces being disposed between the respective ends of said magnet and the sides of said frame, said pieces being provided with an integral extension lug at the ends of the first portions thereof, each lug protruding through an aperture in the closed end of said frame and being .bent to secure said pieces within said frame, said pole pieces forming a gap between the ends of the second portions thereof, said second portions retaining said magnet against the closed end of said frame, a vibrating reed clamped between said blocks extending toward the closed end of said frame, said reed vibrating in the direction of both sides of said frame, within the gap formed by said pole pieces and a coil secured in said frame positioned between said blocks and said.
pole pieces, said coil surrounding said reed and vibrating same in resonance withits natural I period. r
' GEORGE EANNARINO.
REFERENCES crrnn The following references are of record in the file of this patent:
UNITED STATES PATENTS
US650052A 1946-02-25 1946-02-25 Selective relay Expired - Lifetime US2486394A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547026A (en) * 1948-01-02 1951-04-03 Motorola Inc Vibrating reed structure
US2579289A (en) * 1949-11-05 1951-12-18 Bell Telephone Labor Inc Temperature compensated resonant vibrating system
US2618754A (en) * 1950-07-21 1952-11-18 George F Daly Electromagnetic relay
US2678360A (en) * 1951-04-25 1954-05-11 Servomechanisms Inc Vibrator
US2698366A (en) * 1952-04-02 1954-12-28 Oak Mfg Co Electromagnetic chopper
US2719891A (en) * 1952-06-26 1955-10-04 Stephen F James Magnetic vibratory switch
US2831936A (en) * 1956-02-14 1958-04-22 James Vibrapowr Co High frequency vibrator or the like
US2866028A (en) * 1955-06-14 1958-12-23 Bristol Company Electrically actuated contactor
US2957062A (en) * 1954-12-20 1960-10-18 Hartmann & Braun Ag Frequency relay
US2960586A (en) * 1958-11-07 1960-11-15 Bristol Company Electrical contactor
US3084235A (en) * 1961-12-06 1963-04-02 Stevens Arnold Inc Tuning fork type relays
DE1190574B (en) * 1958-12-12 1965-04-08 Wurlitzer Co Resonance reed relay
US3218408A (en) * 1963-03-26 1965-11-16 Electro Networks Inc Resonant reed relay
US3302141A (en) * 1962-11-12 1967-01-31 Mayer Ferdy Alternating current sensitive relay

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB488502A (en) * 1937-01-08 1938-07-08 Coyne Albert Edward Improvements relating to electrically-maintained vibrating bodies
US2327395A (en) * 1942-05-26 1943-08-24 Union Switch & Signal Co Electromagnetic device
GB557089A (en) * 1942-05-06 1943-11-03 Robert Saint George Terry Improvements relating to electromagnetic devices
US2415691A (en) * 1944-06-16 1947-02-11 Mallory & Co Inc P R Vibrator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB488502A (en) * 1937-01-08 1938-07-08 Coyne Albert Edward Improvements relating to electrically-maintained vibrating bodies
GB557089A (en) * 1942-05-06 1943-11-03 Robert Saint George Terry Improvements relating to electromagnetic devices
US2327395A (en) * 1942-05-26 1943-08-24 Union Switch & Signal Co Electromagnetic device
US2415691A (en) * 1944-06-16 1947-02-11 Mallory & Co Inc P R Vibrator

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547026A (en) * 1948-01-02 1951-04-03 Motorola Inc Vibrating reed structure
US2579289A (en) * 1949-11-05 1951-12-18 Bell Telephone Labor Inc Temperature compensated resonant vibrating system
US2618754A (en) * 1950-07-21 1952-11-18 George F Daly Electromagnetic relay
US2678360A (en) * 1951-04-25 1954-05-11 Servomechanisms Inc Vibrator
US2698366A (en) * 1952-04-02 1954-12-28 Oak Mfg Co Electromagnetic chopper
US2719891A (en) * 1952-06-26 1955-10-04 Stephen F James Magnetic vibratory switch
US2957062A (en) * 1954-12-20 1960-10-18 Hartmann & Braun Ag Frequency relay
US2866028A (en) * 1955-06-14 1958-12-23 Bristol Company Electrically actuated contactor
US2831936A (en) * 1956-02-14 1958-04-22 James Vibrapowr Co High frequency vibrator or the like
US2960586A (en) * 1958-11-07 1960-11-15 Bristol Company Electrical contactor
DE1190574B (en) * 1958-12-12 1965-04-08 Wurlitzer Co Resonance reed relay
US3084235A (en) * 1961-12-06 1963-04-02 Stevens Arnold Inc Tuning fork type relays
US3302141A (en) * 1962-11-12 1967-01-31 Mayer Ferdy Alternating current sensitive relay
US3218408A (en) * 1963-03-26 1965-11-16 Electro Networks Inc Resonant reed relay

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