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US2750982A - Apparatus for adjusting electrical contacts - Google Patents

Apparatus for adjusting electrical contacts Download PDF

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Publication number
US2750982A
US2750982A US274544A US27454452A US2750982A US 2750982 A US2750982 A US 2750982A US 274544 A US274544 A US 274544A US 27454452 A US27454452 A US 27454452A US 2750982 A US2750982 A US 2750982A
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US
United States
Prior art keywords
springs
stud
frame
coupling
machine
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
Application number
US274544A
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English (en)
Inventor
Simon Malcolm
Rommel Frederick Emil
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telephone Manufacturing Co Ltd
Original Assignee
Telephone Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Application granted granted Critical
Publication of US2750982A publication Critical patent/US2750982A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements

Definitions

  • This invention relates to electrical contacts and more particularly to arrangements for adjusting multiple spring contact sets of the cantilever type.
  • the invention has for its object to provide an improved method of and means for adjusting electrical contact springs, and thereby the contacts carried by them and in accordance with the invention a contact spring of the cantilever type is adjusted by bending the spring past its elastic limit in one direction, then bending it past its elastic limit in the opposite direction and continuing such bending process in alternate directions with decreasing amplitude until the elastic limit is no longer exceeded.
  • the present invention is concerned more particularly with a method of and a machine for adjusting the fixed contacts of a relay described in that prior specification, but as will appear hereinafter a machine in accordance with the invention can be used generally where it is required to adjust a series of cantilever springs so as to space them accurately with respect to each other and, if required, to a datum surface.
  • Figure 1 is a side elevation, with part of the drive gears removed, of the contact setting machine
  • Figure 2 is a section through the same machine taken on the line 22 of Figure l; in this figure the line 1-1 shows the plane of the view on which Figure 1 is taken;
  • Figure 3 is a side elevation, showing the side opposite that shown in Figure 1;
  • Figure 4 is a front elevation, on an enlarged scale, of the setting plate
  • Figure 5 is a cross-section of the setting plate on the line 55 of Figure 4.
  • this machine comprises a main, robust framework 10, of roughly rectangular shape, at one end of which is a frame 11 which reciprocates in a vertical plane; this frame carries a setting plate 12 which receives the tips of the contact springs 13 of the spring set 14 of ICC the relay, which is located accurately on the framework.
  • the frame is reciprocated by a mechanism which causes the amplitude of the reciprocations to be gradually and successively decreased, and the mechanism permits of adjustment of the initial, maximum amplitude, and also the mean position of the frame.
  • the mechanism is operated from hand or power driven shafts, and the operation is automatic and cyclic, so that in one cycle of adjustment the amplitude of reciprocation is initially a maximum, then decreases slowly to zero, and returns rapidly to maximum, on continued rotation of the shaft.
  • the framework 10 has at its upper part an accurately machined surface 10a on which the relay structure can be precisely located by stops 15 and clamped by clamps 16 with the fixed contact springs in a position which is approximately over one end face of the framework.
  • the spring set forms a separate unit, having surfaces which can be used as datum surfaces for adjustment of the springs. Accordingly, these surfaces are located with reference to the stops 15 and the datum surfaces 100, either by directly engaging these surfaces or with interposed gauge blocks 17.
  • This frame consists of two vertical parallel side members 11a and 11b secured rigidly together by cross members 18, and is carried from the framework by means of two pairs of parallel links 19 pivoted to the frame at 20 and to the side members at 21.
  • the links are themselves coupled together by cross members 22; the rear of these members pass through holes 10b in the frame.
  • the frame 11 has secured to it, preferably detachably, the setting plate 12.
  • This setting plate has in it a series of accurately finished openings which are intended to receive respectively the tips of the contact springs.
  • the plate is made by milling grooves 12a and 12b at right angies in opposite faces of a rectangular steel plate, the openings being formed where the grooves intersect, so providing a pattern of rectangular openings as shown in Figure 4.
  • the grooves 12b on the one face are made quite shallow, whilst the grooves 12a on the other face are substantially wider and deeper. This leaves ample room for movement of the spring contacts.
  • the mechanism for reciprocating the frame includes a main driving shaft 25 mounted horizontally in the framework and which is provided with a handle at 26, or is adapted to be power driven.
  • This driving shaft passes through the framework 10 and at its inner end carries a crank member 27, and in addition the shaft is coupled to drive a rotary snail cam 24 at a substantially reduced speed, in this particular construction at a speed of one forty-third of that of the driving shaft 25.
  • a pinion 28 which meshes with a pinion 29 on a shaft 30, mounted in the framework 10;
  • pinion 29 drives pinion 31 on the same shaft 30, and this pinion 31 in turn drives pinion 32 on shaft 25.
  • Pinion 32 likewise moves with a further pinion 33 on the same shaft and this pinion 33 drives the final pinion 34 on shaft 30, and thereby to drive that shaft.
  • the snail cam is fast on the shaft 30, and is accordingly driven thereby.
  • crank member 27 on the shaft 25 is used to cause the oscillation of a forked arm 35, this being effected by securing the forked arm on a supporting shaft 36, this shaft also having secured to it a drive lever 37.
  • a con necting link 38 is then attached at its one end to the crank member 27' and at its other to the drive lever 37, as shown in Figure 3.
  • the attachment of the link to'th'e drive lever is by a pivot pin 39, which is mounted in a slot 370: in the lever 37 so that its position along the slot can be varied.
  • the drive lever and hence the arm shaft is oscillated; the extent of the oscillation can be varied by movement of the pin in the slot; the mean position of the arm shaft can be varied by adjusting the shaft angularly with respect to the drive lever.
  • the drive lever is adjustably secured to the shaft, by a split clamp 37b.
  • the extent of the resultant movement of the frame depends inter alia on the distance between the centre of the shaft 36 carrying the fork 35 and the centre of the stud 43, if the stud is at the end of the fork the motion will be a maximum, and if the stud is coaxial with the shaft there will be no motion at all.
  • the amplitude of the frame is controlled by movement of the stud in this way, the stud being secured at the end of a support rod 44 the other end of which is pivoted at 45 in a slide plate 46.
  • the slide plate is guided for linear movement by guide slots 46a therein engaging guide pins 47 on the framework it) of the machine, and carries a cam-follower roller 4% engaging the edge of the snail cam 24.
  • the slide plate is tensioned by spring 49 to keep the follower on the cam.
  • the contact springs 13 are bent backwardly and forwardly with decreasing amplitude, and are finally accurately located with respect to each other and to a predetermined surface on the relay assembly.
  • the backwards and forwards movement of the springs can also be used to improve somewhat the mechanical properties of the contact springs.
  • the mechanical bending cause a work hardening of the spring, if the metal thereof has not previously been fully hardened, and there is a progressive hardening along the length of the spring with the successive bending movements. For this reason it is preferred that the metal of the springs is not fully hardened. Satisfactory results have been obtained using Phosphor bronze strip sold as hard, and having a hardness in the range of 185 to 210 as measured by a Vickers pyramid diamond hardness test, to British standard specification N0. 427.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine in spaced relation in a column and relative to a datum position, means comprising a frame with spaced slots in which the ends of said springs are individually engaged, said frame being movable in alternate directions to bend the same through desired set positions with reference to said datum position, a driving member, a variable mechanical transmission means coupling said driving member to said spring engaging means to move the same in alternate directions to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine in spaced relation in a column and relative to a datum position, means comprising a frame with spaced slots in which the ends of said springs are individually engaged, said frame being movable in alternate directions to bend the same through desired set positions with reference to said datum position, a drivin member adapted to be driven at a uniform rate, a variable mechanical transmission means coupling said driving member to said spring engaging means to move the same in alternate directions to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine relative to a datum position, means engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, a driving member adapted to be driven at a uniform rate, a member driven from said driving member and (mused to pivot about an axis, a coupling member engageable with said pivoted member at a variable distance from said axis, and cam means operated by said driving member for varying the distance of said coupling member from the axis of said pivoted member, whereby the movement of said coupling member is progressively varied, and means for moving said spring engaging means in accordance with the movement of said coupling means, thereby to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine relative to a datum position, means engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, a driving member adapted to be driven at a uniform rate, a member pivotable about an axis and driven from said driving member, a member coupling said driving means to said spring engaging means and engageable with said pivoted member, said pivoted member having guide surfaces thereon between which said coupling member is constrained to move at a variable distance from said axis, cam means operated by said driving member for decreasing the distance of said coupling member from the axis of said pivoted member whereby the range of movement of said coupling member is progressively decreased, and means for moving said spring engaging means in accordance with the movement of said coupling member, thereby to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine relative to a datum position, means engaging said springs and movable in alternate directions to bend the same through the desired set positions with reference to said datum position, a driving member adapted to be driven at a uniform rate, a member pivotable about an axis and driven from said driving member, a member coupling said driving means to said spring engaging means and engagea le with said pivoted member, said pivoted member having guide surfaces thereon between which said coupling member is constrained to move at a variable distance from said axis, cam means operated by said driving member for decreasing the distance of said coupling member from the axis of said pivoted member whereby the range of movement of said coupling member is progressively reduced, and means for moving said spring engaging means in accordance with the movement of said coupling means, thereby to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine relative to a datum position, means engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, a driving member adapted to be driven at a uniform rate, a member pivotable about an axis and driven from said driving member, said pivoted member having a slot therein, a member coupling said driving means to said spring engaging means, a stud carried by said coupling member and engaged in said slot of said pivoted member for constraining said coupling member to move at a variable distance from said axis, cam means operated by said driving member for decreasing the distance of said coupling member from the axis of said pivoted member whereby the range of movement of said coupling member is progressively decreased, and means for moving said engaging means in accordance with the movement of said coupling means thereby to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine relative to a datum position, means engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, a driving member adapted to be driven at a uniform rate, a slotted member pivotable about an axis and driven from said driving member, an arm carrying a stud which extends through the slot of said pivoted member, a slide plate on which said arm is pivoted, cam means operated by said driving member for moving said slide plate to decrease the distance of said stud from the axis of said pivoted member, whereby the range of movement of said stud is progressively decreased, and means coupling said stud to said spring engaging means, thereby to actuate said spring engaging means to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising mounting means for mounting said springs on said machine relative to a datum position, means engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, a driving member adapted to be driven at a uniform rate, a slotted member pivotable about an.
  • an arm carrying a stud which extends through the slot of said pivoted member, a slide plate on which said arm is pivoted, a snail cam operated by said driving member for moving said slide plate progressively to decrease the distance of said stud from the axis of said pivoted member, whereby the range of movement of said stud is progressively decreased, and means coupling said stud to said spring engaging means, thereby to actuate said spring engaging means to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising a stationary framework, means for mounting said springs on said stationary framework in predetermined relation to a datum position, means engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, said spring engaging means including a plate having therein apertures to receive said springs, a driving member adapted to be driven at a uniform rate, a slotted member pivotable about an axis and driven from said driving member, an arm carrying a stud which extends through the slot of said pivoted member, a slide plate on which said arm is pivoted, a snail cam operated by said driving member for moving said slide plate progressively to decrease the dis tance of said stud from the axis of said pivoted member, whereby the range of movement of said stud is progressively decreased, and means coupling said stud to said spring engaging means, thereby to actuate said spring engaging means to bend the springs repeatedly through their desired set positions by displacements of decreasing amplitude in the successive movements
  • said spring engaging means comprises a frame carrying a plate apertured to receive said springs and means mounting said frame on said stationary framework for oscillation.
  • said spring engaging means comprises a frame carrying a plate apertured to receive said springs, links pivoted on said stationary framework and supporting said frame for oscillation.
  • a machine for simultaneously adjusting a plurality of electrical contact springs comprising a stationary framework, means for mounting said springs on said stationary framework in predetermined positions relative to a datum position, means for engaging said springs and movable in alternate directions to bend the same through desired set positions with reference to said datum position, said spring engaging means comprising a plate grooved at the opposite sides thereof to provide apertures to receive said springs, a driving member adapted to be driven at a uniform rate, a slotted member pivotable about an axis and driven from said driving member, an arm carrying a stud which extends through the slot of said pivoted member, a slide plate on which said arm is pivoted, a snail cam operated by said driving member for moving said slide plate progressively to decrease the distance of said stud from the axis of said pivoted member, whereby the range of movement of said stud is progressively decreased, and means coupling said stud to said spring engaging means thereby to actuate said spring engaging means to bend the springs repeatedly through their desired set positions by displacements of decreasing ampli

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US274544A 1951-03-09 1952-03-03 Apparatus for adjusting electrical contacts Expired - Lifetime US2750982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5740/51A GB734490A (en) 1951-03-09 1951-03-09 Improvements in and relating to the adjustment of electrical contact springs

Publications (1)

Publication Number Publication Date
US2750982A true US2750982A (en) 1956-06-19

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Application Number Title Priority Date Filing Date
US274544A Expired - Lifetime US2750982A (en) 1951-03-09 1952-03-03 Apparatus for adjusting electrical contacts

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US (1) US2750982A (nl)
BE (1) BE509565A (nl)
GB (1) GB734490A (nl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9149852B2 (en) 2013-03-14 2015-10-06 M.I.C. Industries, Inc. Panel crimping machine with control system for controlling timing between crimping rollers with an adjustable separation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107622913B (zh) * 2017-10-17 2019-07-16 三友联众集团股份有限公司 一种用于继电器簧片的调整机构
CN108447736A (zh) * 2018-03-26 2018-08-24 三友联众集团股份有限公司 一种用于继电器的自动调整机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1336543A (en) * 1916-05-19 1920-04-13 Western Electric Co Testing-machine
US2251967A (en) * 1936-08-05 1941-08-12 Carl M Yoder Machine for and process of forming structural members
US2389885A (en) * 1942-09-09 1945-11-27 Bristol Company Method and apparatus for straightening blanks
GB611949A (en) * 1946-05-14 1948-11-05 Ferranti Ltd Improvements relating to the truing of small gear-wheels
US2609858A (en) * 1948-12-30 1952-09-09 Rca Corp Lead straightening machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1336543A (en) * 1916-05-19 1920-04-13 Western Electric Co Testing-machine
US2251967A (en) * 1936-08-05 1941-08-12 Carl M Yoder Machine for and process of forming structural members
US2389885A (en) * 1942-09-09 1945-11-27 Bristol Company Method and apparatus for straightening blanks
GB611949A (en) * 1946-05-14 1948-11-05 Ferranti Ltd Improvements relating to the truing of small gear-wheels
US2609858A (en) * 1948-12-30 1952-09-09 Rca Corp Lead straightening machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9149852B2 (en) 2013-03-14 2015-10-06 M.I.C. Industries, Inc. Panel crimping machine with control system for controlling timing between crimping rollers with an adjustable separation

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Publication number Publication date
BE509565A (nl)
GB734490A (en) 1955-08-03

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