US2616995A - Switch - Google Patents

Description

Patented Nov. 4, 17952 UNITED STATES PTEN T OFFICE ASWITCH Sven -Gusta-Falk; Stockholm,'-`-Sw`eden, assignorvto Hartford National Bank-and Trust Company,

Hartford, Conn., as'trustee Application July 23, 1`949,Seial No. 106,355

' Inthe'Netherlands July'27, 1948 use inlelectri'c gramophones. 'Switches ofthe l type to lwhich the invention i`s'-directed .comprise two-fmovablecontacts and associated` kcontrolmembers soarrangedthat switching on and off is effected by actuating one of the control members. f

-fIA-t -is an object 'of the invention to provide a novelffswitch vconstruction wherein the contacts may Abe #brought into an actuated position by either of the controlmembers and can be returned to the rest position solely by aspecific one of `the two control members. #Aifurtheriobject of the invention is to provide a lswitch"particularlyl adaptedfor use in electric gramophones, which switch issimpler to 4 construct, vis: positive and foolproof-in ,its `action and isfof low cost. i

These and further objects of 'the inventionwill appear as the specification progresses. Iswitch in accordance with the-invention comprises "two movableucontacts and `.associated control-members. VVVArranged between each` contact-'andi Athe associated control member'l is a couplingsystem. One of the coupling systems permitsth'e controlfmember to adjust the contactto :either-one of twotpositions whereasthe other `coupling system permitsithe Vcontrol membertoadjust Sthe associated contact to solely one oiitwo'positions. ISInJaZpreerred embodiment ofY the: invention fthe 44coupling systems each comprise a kink spring. which is' so Ipivoted assto provide the above-noted degrees of 4movement ofthe contacts. Y

The yinvention will :be .described 'ingreater vde.- tail withreference Atoxthe `appended...drawing forming part of vspecification andlin which: 'Fig lis afschematieshowing oran electrical switchY in accordance with the invention,

YFig; 2 shows. a modification foi/:the switch.V of Fig;` 1,

*Fig Bschematically illustratesv the, construction of one of the contact 'and ,coupling systems ofthe switch of the invention, and

Fig.v 4 .is a cross-sectionallview.- oi?` a gramo# phoneswitch i in accordance Awith :the invention.

A I' The -switch shown in'lig. l comprises contact members Iv and 2,which are Arelativelyrmoi/'able in the manner 'of so-called hammer contacts,

With the interposition of kink springs 3 'and 4 respectively. thelatter being shown Vin Fig. `V3, the con-tact members vI and- 2 are movable by means oiseparate switching arms 5 and'- Iil respectively, each having two operating positions. Forv this purpose the switching arms 5 and 6 are rotatable about spindles 'I and 8 respectively,vse cured in the housing of the switch, so that lugs 9 and le respectively, which are secured to the arm, are adapted to act-upon the terminal part of the kink springs 3 and 4 respectively. The kink springs 3 and 4 respectively are furthermore pinched with `a determined tension` on blocks Il and I2 respectively, which are secured to the Vhousing of the switch and which extend through an aperture in each ofthe kink springs 3 and 4, the apertures being provided by tongues I3 and I4 respectively which are punched 'out of the springs 3 and I-respectively and the free ends of the tongues, in the bent position, engagev as knife edges grooves I5 and I6 respectively, provided at one side of the blocks Il 'and I2 vrespectively,.whereas the edges of the saidapertures in the springs 3 and 4 respectively engage as knife edges grooves I1 and I 3 respectively, provided at the opposite side of the blocks I I and I2 respectively. The springs 3 and I are 'connected through leads to a voltage source.

The coupling'between the first switching arm 5 and the kink Vspring 3 is such that displacement of the arm 5 from the position shown into the position shown by. dotted lines, and conversely, has the effect that a moment turning tothe leftlor to the right with respect to the block I I is f exerted on the terminal part of the kink spring one of the positionstowardszthe other, i. e.1from the position shown in full lines into the positionY shown in dotted lines ,a moment isv exerted relative to the block I2 on the terminal part of the spring 5, resulting in the spring tension variation required for kinking and'in vthe associated contact member 2 being pushed towards the othercontact. member I. .Onmoving theswitching arm 5 backinto-the position shown, a momentis not exerted on the terminal part of the spring 4, Vso that the spring will not move.

The construction is such that in the position shown of the second switch arm 6 (switching- 01T position) the switch is open in the position shown of the first switching arm 5 and isclosed when the last-mentioned arm `occupies ftheposi tion shown in dotted lines. In the position shown of the arm 5, the switch may, as an alternative, be closed by moving the arm 6 into the position VYof this arm shown in dotted lines (switching-on position). The switch remains closed when the arm 5 is moved into the position shown in. dotted lines, i. e. the position in which the switch is closed if the arm 5 alone, as described above, would close the switch. In this position the tensile force of the spring 4 is smaller than that of the spring 3, i. e. when the arm 6 is moved back into the switching-off posig tion (shown), the switch remains closed since the two contact members I and 2 are jointly moved downwards by the diiference in tensile force of the springs. undergoes a position variation, the switch will be opened.

In order to restrict the stroke of the contact members I and 2, the extremities of the springs 3 and 4 to which the contact members are secured, in the position in which the switch is open, engage fixed stops I9 and 20 respectively, which are provided in the housing of the switch.

The arm 6 is preferably subject to spring action in such manner that, in order to obtain the aforesaid sWitching-on position, the arm must be moved against the action of this spring. This involves that, after being moved into the onposition (shown in dotted lines), the arm 5 automatically'returns to the position shown, so that in the case last described the switch can be opened only by position variation of the arm 5. Furthermore, the first arm 5 will not be capable of opening the switch when the second arm S occupies the on-position. In this case both contact members would jointly move upwards.

It is thus possible to close the switch by position variations of both switching arms, but to open it in all circumstances by position variation of the arm 5. This is important if the switchis used for switching on and off the current for a gramophone motor. Such a switch is shown in Fig. 4. In the position shown the switch is open. The switching arm 5 of Fig. 1 is replaced by a support 2l for the pick-up arm 22. The fixed block II of the said gure is replaced by a movable block 23, which is rtatable about a-shaft 24 and which forms part of the support. A blade spring 25, of which one end is secured to the housing of the switch at 26 and the other end to the block 23, forces the support to occupy the position shown in dotted lines, The switching arm of Fig. 1 constitutes a manual switching lever 2l, which is urged into the position Vshown by the abovedescribed spring 2B. The springs 3 and 4 are connected to a voltage source through the spring and through a lead respectively. The operation'of the switch is as follows.

As soon as the pick-up arm is lifted, the support moves, under the action of spring 25, into the position shown in dotted lines with the result that the required kinking tension is produced in the spring 3 and the contact member I moves downwards to close the switch. As soon as the pick-up arm, for example, after a gramophone record has been played, is placed on the support, the latter returns to the position shown, the contact member I moves upwards and the switch is opened again. While the pick-up arm lies on the support, the motor current may yet be switched-on by moving the switching lever 21 into the position shown in dotted lines. Thus, the tension .variation required for kinking. is

When the arm 5 again.

produced in the spring 4, so that the contact member 2 moves upwards and the switch closes. When the lever 21 is released, it moves under the action of spring 23 back into the position shown without involving the tension variation in the spring 4 required for .kinking Consequently, the contact member remains in the rest position. When the pick-up arm is now lifted, the required kinking tension is produced in the spring 3 owing to the change in position of the support 2| and both contact members jointly move downwards, so that the switch remains closed.. 'As soon as the pick-up arm has been Aplaced again on the support, the contact member I moves upwards so that the switch is opened.

What I claim is:

1. An electrical switch comprising first and secondV movable contact members, first and second control members, a first coupling member interposed between said first contact member and said first controlmember and being arranged to move-said first contact member to first and second positions corresponding to first and second positions of said first coupling member, and a second coupling member interposed between said second contact member and said second control member and being arranged upon movement of said second control member from first to second positions thereof to solely move said second contact member into contact with said first contact member at the first of the said positions of said rst contact member.

2. An electrical switch comprising first and second contact members movable in abutting relationship, first and second control members, a firstkink spring member interposed between said first contact member and said rst control member, said first control member acting on said first kink spring member to move said first contact member to first and second positions corn responding to first and second positions of said first control member, said second control member having first and second positions, and a second kink spring member interposed between said second contact member and said second control member, said second control member acting on said second kink member between movement of said second control member from first to second positions thereof to solely move said second contact member into contact With said first contact member, said second kink spring having a tensile force smaller than the tensile force of said first kink spring.

3. An electrical switch comprising rst and second movable contactvmembers, first and second control members, said first control member comprising a support rotatable about a given axis, a first kinkspring member interposed between said rst contact member and said support ofsaid rst control member, vsaid first control member acting on said first kink spring member to move said first contact member to rst and second positions corresponding to first and second positions respectively, of said first control member, and a second kink spring member interposed between said second contact member and said second control member, said second control member acting on said second kink spring member between first and second positions thereof to solely move said second contact member into contact with said rst `contact member at the first of the said positions of said first contact member.

4. An electrical switch comprising first an second movable contact members, rst and second control members, said rst control member comprising a support provided with knife edge mounting grooves on opposite sides thereof and being rotatable about a given axis, a first kink spring coupling member having one end thereof secured to said first contact member and comprising a tongue portion, said tongue portion of said spring engaging the grooves of said support, the end of the spring remote from the contacts engaging said first control member to thereby move said first contact member to first and second positions corresponding to first and second positions of said first coupling member, a fixed support member provided With knife edge grooves in opposite sides thereof, and a second kink spring coupling member having one end thereof secured to said second contact member and comprising a tongue portion, said latter tongue portion and said second spring engaging the grooves of said fixed support, said second control member engaging said second spring between movement from first to second positions thereof to solely move said second contact member into contact with said first contact member at the first of the said positions of said first contact member.

5. An electrical switch comprising first and second movable contact members, first and second control members, said first control member comprising a support provided with knife edge mounting grooves on opposite sides thereof and being rotatable about a given axis, a first kink spring coupling member having one end thereof secured to said first contact member and comprising a tongue portion, said tongue portion of said spring engaging the grooves of said support, the end of the spring remote from said contacts engaging said first control member to thereby move said first contact member to first and second positions corresponding to first and second positions of said first coupling member, a `fixed support member provided with knife edge grooves on opposite sides thereof, a second kink spring coupling member having one end thereof secured to said second contact member and comprising a tongue portion, said latter tongue portion and said second spring engaging the grooves of said fixed support, said second control member engaging said second spring between movement from first to second positions thereof to solely move said second contact member into contact With said first contact member at the first of the said positions of said first contact member, and means to resiliently bias said second control member urging the same to the said first position thereof.

SVEN GUSTAF FALK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date v 1,720,844 Lotz July 15,- 1929 1,834,550 Reed Dec. 1,; 1931 2,135,864 Weber Nov. 8,1938 2,295,463y Fetter Sept. 8,1942 2,429,813 Hausler Oct. 28, 1947

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