US2786164A - Instrument suspension - Google Patents

Instrument suspension Download PDF

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Publication number
US2786164A
US2786164A US374743A US37474353A US2786164A US 2786164 A US2786164 A US 2786164A US 374743 A US374743 A US 374743A US 37474353 A US37474353 A US 37474353A US 2786164 A US2786164 A US 2786164A
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United States
Prior art keywords
armature
spring
springs
suspension
relay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US374743A
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English (en)
Inventor
Carpenter Rupert Evan Howard
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Individual
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Individual
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Publication date
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Publication of US2786164A publication Critical patent/US2786164A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays

Definitions

  • This invention relates to instruments of the class having a defiectable pivoted member mounted on a spring suspension and, in particular, to electromagnetic transducers having a moving iron armature and especially to polarised relays coming within that category.
  • the armature experiences magnetic forces tending to produce unstable equilibrium and it is almost always necessary, in order to secure a reasonable degree of sensitivity or in order to make the armature when the relay is unenergised, maintain a central position, to use mechanical springs having positive stiffness partly or Wholly to balance out the negative stiffness produced by the magnetic forces.
  • the main object of the present invention is to eliminate as far as possible the change of bias with temperature.
  • the invention also aims at reducing the effect of bias due to creep in the springs.
  • a further object is to make it more easy in some cases to standardise the strength of the springs in the course of manufacture.
  • the working part of the spring which operates in torsion may be made of smaller cross-section than the rest of the spring.
  • the part of reduced crosssection which, of course, constitutes most of the working part of the spring may be made with the ratio of width to breadth near to unity since, in this manner, the maximum stress on any part of the cross-section of the spring is minimised.
  • Figure 1 is a front elevation of a polarised electromagnetic relay provided with a form of suspension in accordance with the invention
  • Figure 2 is a front elevation to an enlarged scale of the two pole-pieces of the relay secured together with the armature and its spring mounting system;
  • Figures 3, 4 and 5 are respectively front elevation, side elevation from the left of Figure 3, and plan of one of the springs used in the suspension;
  • Figure 6 is a side elevation similar to Figure 5 showing a slight modification.
  • a relay is shown having the features of that disclosed in Patent No. 2,559,399 and the same reference numerals are used for the corresponding parts.
  • the relay coil is shown at '7, the permanent magnets at 9, the armature at 3 and the bars 6 are the supports for the fixed contacts.
  • the two pole-pieces l, 2 are identical and formed of magnetically soft alloy.
  • each consists of a flat plate with an arm 3 forming the pole-piece proper, a shank 4 and an upward projection 5 opposite the shank 4, each for carrying a bar which serves as the support for the fixed contacts of the relay as in the prior specification.
  • the armature 13 is also similar and bears the moving contacts 20.
  • the suspension strips shown in the drawings are modified into L-shaped form in accordance with the present invention and are seen at 14.
  • Each strip consists of a horizontal working portion 21 which operates in torsion and a second portion 22 at right angles to the Working portion 21 and extending parallel to the edge surfaces of the armature 13.
  • Each L-shaped suspension strip is bent about a transverse axis which is parallel with the plane of the strip; in other words, it is bent about the axis of greatest compliance, so that the broad faces of sections 21 and 22 are arranged in planes at right angles to each other.
  • the broad faces of portions 22 are clamped to the edge faces of the armature by clamping plates 23, 23a and bolts 24 which are threaded into the thicker plate 23 but pass with clearance through the armature 13. Instead, however, separate screws 24 could be used at either end both being threaded into the armature.
  • the elbow .25 at the bend between the portions 21 and 22 is spaced from the end surface of the armature by providing the latter with a shallow recess or depression at 26 on either edge.
  • each working portion 271 is fixed to a mounting block 27 which itself is fixed to the polepiece 1 or 2 by a pair of screws 23 with a sheet 2) of insulating material interposed between the anchor block 27 and the pole-piece 1 or Z.
  • the portion 21 is secured to the anchor block 27 by a screw 38 and a clamping plate 31.
  • the greater part of the working portion 21 of the spring strip 14 is reduced in width over an accurately predetermined length. It will then be realised that if the sum of the expansions of the springs 14 and of the armature 13 is different from that of the pole-pieces 3 between the two fixed anchor blocks 27, this difference can be taken up at the elbows 25 in the springs which are free to move closer to or further from the armature 13 without unduly stressing or distorting the springs 14. During this process the portions 22 of the springs act as cantilevers allowing the elbows 25 to yield relatively freely.
  • the springs 14 may be made of beryllium copper, and may have a thickness, for example of 0.015 inch. This matc'ial is capable of precipitation hardening so that after bending a sprint at 25 it can be rehardened in a suitable fixture to assume the desired shape and to establish maximum stability in it.
  • one end of the spring may be directly fixed to the armature as in Figure 4 of the drawings of Patent No. 2,559,399. and the working portion ex ends at right angles to the armature, and a part at the outer end of this horizontal portion be turned at a right angle and then fixed by screws to side surfaces of anchor blocks, such as blocks 27. Then the elbows in the spring strips which float to take up the difference in expansion lie at the ends of the working portions 21 near to the anchoring blocks 27.
  • each strip being secured near one end thereof respectively to opposite parallel edge surfaces of said armature and secured near the opposite end thereof to the frame of the instrument, each of said spring strips being formed with a right-angle bend in its length to provide to one side of the bend, a working portion stressed in torsion to exert the restoring force for said armature and, to the other side of the bend, a second portion providing a floating elbow at the region of the bend.
  • each of said spring strips lies in a plane containing the pivotal axis of said armature and the second portion of each of said spring strips lies substantially parallel to the edge surface of said armature to which it is secured.
  • An electromagnetic instrument comprising a supporting frame, an armature, mounting means supporting said armature upon said frame for pivotal movement about a predetermined axis comprising a pair of L shaped spring members arranged on opposite sides of said armature, one end of each spring member being connected with the armature and the other end being connected with said frame, said spring members being an ranged with one arm of each member extending along said axis and providing the greater part of the compliance permitting angular vibration of the armature about said axis, and the other arm of each spring member extending parallel with the axis of said armature and providing compliance permitting differential thermal expansion of the armature assembly and the frame with low stress on said spring members.
  • An electromagnetic instrument comprising a supporting frame, an armature, mounting means supporting said armature upon said frame for pivotal mGJC- mcnt about an axis located within the central plane of the armature comprising a pair of L-shaped spring members arranged on opposite sides of said armature and having their planes coinciding with said central plane, one end of each spring member being connected with the armature and the other end being connected with said frame, said spring members being arranged with one arm of each member extending along said axis and providing the greater part of the compliance permitting angu lar vibration of the armature about sai axis, and the other arm of each spring member extending parallel with the axis of said armature and providing a compliance permitting differential thermal expansion of the armature assembly and the frame with low stress on said spring members.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Springs (AREA)
US374743A 1952-08-27 1953-08-17 Instrument suspension Expired - Lifetime US2786164A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB320554X 1952-08-27

Publications (1)

Publication Number Publication Date
US2786164A true US2786164A (en) 1957-03-19

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ID=10332471

Family Applications (1)

Application Number Title Priority Date Filing Date
US374743A Expired - Lifetime US2786164A (en) 1952-08-27 1953-08-17 Instrument suspension

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US (1) US2786164A (US07229529-20070612-C00001.png)
BE (1) BE522355A (US07229529-20070612-C00001.png)
CH (1) CH320554A (US07229529-20070612-C00001.png)
DE (1) DE1011994B (US07229529-20070612-C00001.png)
FR (1) FR1087500A (US07229529-20070612-C00001.png)
GB (1) GB734352A (US07229529-20070612-C00001.png)
NL (2) NL180914B (US07229529-20070612-C00001.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092685B (de) * 1958-08-23 1960-11-10 Zeiss Carl Fa Kreuztisch fuer Mikroskope
US3088058A (en) * 1959-10-26 1963-04-30 Siemens Ag Contactor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064418A (en) * 1935-08-20 1936-12-15 Knapp Monarch Co Electric vibrator
US2506234A (en) * 1946-07-17 1950-05-02 Bendix Aviat Corp Electric regulator
US2559399A (en) * 1946-10-02 1951-07-03 Carpenter Rupert Evan Howard Polarized electromagnetic relay
US2580123A (en) * 1945-07-04 1951-12-25 Bell Telephone Labor Inc Relay

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US249140A (en) * 1881-11-01 Henry binns
NL119728B (US07229529-20070612-C00001.png) * 1942-12-04

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2064418A (en) * 1935-08-20 1936-12-15 Knapp Monarch Co Electric vibrator
US2580123A (en) * 1945-07-04 1951-12-25 Bell Telephone Labor Inc Relay
US2506234A (en) * 1946-07-17 1950-05-02 Bendix Aviat Corp Electric regulator
US2559399A (en) * 1946-10-02 1951-07-03 Carpenter Rupert Evan Howard Polarized electromagnetic relay

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092685B (de) * 1958-08-23 1960-11-10 Zeiss Carl Fa Kreuztisch fuer Mikroskope
US3088058A (en) * 1959-10-26 1963-04-30 Siemens Ag Contactor

Also Published As

Publication number Publication date
NL180914B (nl)
FR1087500A (fr) 1955-02-24
NL97543C (US07229529-20070612-C00001.png)
CH320554A (fr) 1957-03-31
BE522355A (US07229529-20070612-C00001.png)
GB734352A (en) 1955-07-27
DE1011994B (de) 1957-07-11

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