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Publication numberUS3283107 A
Publication typeGrant
Publication dateNov 1, 1966
Filing dateJul 20, 1964
Priority dateJul 20, 1964
Publication numberUS 3283107 A, US 3283107A, US-A-3283107, US3283107 A, US3283107A
InventorsAnson James H
Original AssigneeSangamo Electric Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Interrupter having positive stop means for contact elements
US 3283107 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

Nov. 1, 1966 J. H. ANSON 3,283,107

INTERRUPTER HAVING POSITIVE STOP MEANS FOR CONTACT ELEMENTS Filed July 20, 1964 5 $heetsSheet 1 ii .1. 7 14 6'1 26 J0 9a L I 16 LfiZ/QQJZ for James 77. 0223012 f] Nov. 1, 1966 J. H. ANSON 3,283,107

INTERRUPTER HAVING POSITIVE STOP MEANS FOR CONTACT ELEMENTS Filed July 20, 1964 s Sheets-Shet 2 \L {I 1 I Li/ t? Nov. 1, 1966 J. H. ANSON 3,283,107

vINTERRUP'IER HAVING POSITIVE STOP MEANS FOR CONTACT ELEMENTS Filed July 20, 1964 5 Sheets-Sheet 5 James 7% @223022 f MManv W MI 9L (My;

United States Patent 3,283,107 INTERRUPTER HAVING POSITIVE STOP MEANS FOR CONTACT ELEMENTS James H. Anson, Auburn, 11]., assignor to Sangamo Electric Company, Springfield, 11]., a corporation of Dela- Ware Filed July 20, 1964, Ser. No. 383,600 6 Claims. (Cl. 200-166) This invention relates to circuit interrupters for use in telephone circuitry and analogous purposes.

It is known to provide cam actuated switch means for briefly interrupting, at short and uniform time intervals, the circuit of a light connected to a telephone circuit to produce a wink signal. The wink signal means is associated with supplementary telephone circuitry well known in the art and which requires no detail description. The Haydon patent, No. 3,106,620, discloses a circuit interrupter comprising cam actuated means of the character stated for producing a wink signal and cam actuated means for controlling associated supplementary circuitry.

The interrupter of my present invention is broadly similar to the switch means of the Haydon patent, but is directed to certain improvements in the means for controlling the supplementary circuitry. Such means comprises cam actuated movable contact elements cooperating with opposed contact elements, which may be referred to as the stationary contact elements. It is important that the contact elements have a wiping action during closing thereof, assuring that they are maintained in a clean condition at all times. Also, it is of importance that the stationary contact elements be accurately adjusted relative to the movable elements and maintained in such adjustment while also having positively limited movement incident to opening of the movable contact elements, effective for assuring breaking of any weld which may occur between the movable and the stationary contact elements. My invention is directed to means whereby attainment of the stated objectives is assured. Further objects and advantages of my invention will appear from the detail description.

In the drawings:

FIGURE 1 is a top plan view of a telephone interrupter embodying my invention;

FIGURE 2 is a sectional view taken substantially on line 22 of FIGURE 1, with certain parts broken away;

FIGURE 3 is an end view of the interrupter of FIG- URE 1; with certain parts broken away and one of the gears partly broken away and shown in section;

FIGURE 4 is an underneath plan view of the interrupter of FIGURE 1;

FIGURE 5 is a fragmentary sectional view taken substantially on line 55 of FIGURE 1, on an enlarged scale;

FIGURE 6 is a sectional view, on an enlarged scale, taken substantially on line 66 of FIGURE 4, of the lower cam means and associated elements;

FIGURE 7 is a sectional view, on an enlarged scale, taken substantially on line 77 of FIGURE 4, of the lower cam means and associated parts; and

FIGURE 8 is a sectional view, on an enlarged scale, taken substantially on line 88 of FIGURE 4, of the lower cam means and associated elements, with the switch blades in contact closing'position.

It is assumed, for purposes of description, that the interrupter is suitably mounted in the position shown in "Ice FIGURE 1, though it may be otherwise suitably disposed, as will be understood. The interrupter of my invention comprises an open frame having rectangular side plates 10 and 11 spaced apart at one end by tubular posts 12 mounted on screw rods 13 passing through plate 11 and anchored in plate 10. The plates 10 and 11 are spaced apart at their other end by an insulating block 14 seating against the inner faces thereof and having lugs 15 fitting snugly in corresponding openings in the plates. The block 14 is formed of a phenolic resin, or any suitable insulating material and the plates 10 and 11 are held tightly seated against the sides of block 14 by screw rods 16 passing through plate 11 and threaded through plate 10 to which they are anchored in a suitable known manner. The frame and the parts mounted thereon are, in practice, enclosed by a transparent plastic housing, not shown, removably mounted on the frame by suitable means, conveniently securing screws.

A constant speed motor 20, preferably a synchronous motor of known type, is mounted on the outer face of plate 11. The drive shaft of motor 20 extends through side plate 11 and has a spur pinion 21 secured on its inner end. Pinion 21 meshes with a gear 22 fixed to one end of a gear and cam assembly 23 rotatably mounted on a cross rod 24 extending between plates 10 and 11 with its ends anchored therein. The assembly 23 is formed of a suitable plastic, preferably nylon, and comprises a cam member 25 having gear 22 at one end and a spur pinion 26 at its other end. The cam member 25 is of a cross section to provide two lobes or risers 27 of gradually increasing radius terminating in approximately radial shoulders 28 (FIGURE 5) respectively connected to the body of the cam by a short are 29 of a radius no greater than that of the associated cam follower, to be referred to more fully presently.

The cam member 25 is rotated counter-clockwise, as viewed in FIGURE 5, and actuates three switch blades 31, 32 and 33 anchored at their outer ends in block 14. The switch blades are formed of elongated strips of beryllium copper, phosphor bronze, or other suitable metal, are resilient and possess appreciable rigidity or stiffness. They are formed at their inner ends to provide substantially U-shaped elements in which cam followers, in the form of rollers 34 of small diameter, previously mentioned, are rotatably mounted. The blades 31, 32 and 33 are so disposed as to be flexed inward toward cam member 25 effective for maintaining the rollers.34 in pressure contact therewith. Each of the blades 31 and 33 is provided, on its outer face and a short distance from its inner end, with a contact element 35. The central switch blade 32 is provided with two laterally projecting fingers 36 each having at its inner face a contact element 37. The contact elements 37 overlie contact elements 35 of blades 31 and 32 and the outer ends of the switch blades are connected to circuitry including the light or wink signal previously mentioned. The shoulders 28 of cam member 25 are spaced apart and the follower rollers 34 of switch blades 31 and 33 are spaced a short distance in advance of the follower roller of switch blade 32, which is of correspondingly less effective length than blades 31 and 33. In the rotation of cam member 25, the shoulders 28 thereof pass beneath the followers of blades 31 and 33, which then move along a shoulder 28 radially inward of cam member 25, opening the contact elements 35 and 36. Shortly thereafter, the cam shoulder passes beneath the follower of switch blade 32, which then moves radially inward, effective for abruptly closing the contact elements 35 and 36 and thereby closing the winker light circuit. In the continued rotation of cam member 25, the contact elements 35 and 36 remain closed until the second shoulder 28 of the cam member passes beneath the cam followers, thereby again briefly opening the light circuit. Accordingly, the winker light circuit is briefly interrupted at uniform time intervals of slight duration. The cam member 25 in conjunction with the switch blades 31, 32 and 33 and associated elements, constitutes the winker light section of the interrupter of my invention.

The pinion 26 at the end of cam assembly 25 remote from gear 22 thereof meshes with a gear 40, adjacent side plate 10, at one end of a compound'cam assembly 41 rotatably mounted on a cross rod 42 extending between and anchored at its ends in side plates 10 and 11. ,The assembly 41 may be formed of any suitable material, preferably nylon. Its inner end portion 41a, extending for approximately one half its length, is of generally circular cross section and is provided with four equally spaced arcuate lobes or ribs 43 (FIGURE 6) of equal radial extent projecting radially outward therefrom and parallel with the axis thereof. The cam assembly 41 is further provided with an intermediate portion 41b (FIGURE 7) extending from the outer end of'portion 41a, and an outer end portion 41c (FIGURE 8) extending from portion 41b to gear 40. The portions 41b and 410 are respectively of approximately one half the length of the inner end portion 41a. The portion 41b is of generally circular cross section and, for the major portion of its circumference, is of a diameter approximately the same as that of portion 41a plus the height or radial extent of two diametrically opposite ribs 43 of portion 410, so that the circumferential surface of portion 41b, for the major portion thereof, coincides with the crests of ribs 43. The portion 41b is provided with a circumferential recess extending the full length thereof and of a depth such that the radius of portion 41b at such recess is approximately the same as that of portion 41a exclusive of the ribs 43 thereof. The recess in portion 4111 provides the latter with two shoulders 44 similar to those of the wink cam 25 and spaced apart a distance somewhat greater than that between two ribs 43 of portion 41a and of approximately the same height or radial extent as the latter ribs. The portion 410 of cam assembly 41 is of circular cross section and of approximately the same diameter as portion 41a exclusive of the ribs 43 thereof. It is provided with a lengthwise r-ib 45 of substantially V-shape in cross section, parallel with the axis of portion 410 and of a height or radial extent approximately the same as the shoulders 44 of portion 41b. The rib 45 is spaced from the leading one of the shoulders 44 approximately one third of the distance therebetween.

The cam member 25 is rotated counter-clockwise, as viewed in FIGURE and at constant speed, thereby driving the cam assembly 41 clockwise, as viewed in FIGURES 6, 7 and 8, at a constant predetermined speed relative to cam member-25. The lower cam assembly 41 cooperates with two sets of switch blades, comprising an upper set of blades 48 and a lower set of blades 49 and 50. The upper set consists of five similar blades and the lower set consists of four substantially similar blades. The switch blades of the two sets are in the form of elongated strips of beryllium copper, phosphor bronze, or any suitable metal and are anchored at their outer ends in block 14. They are resilient and possess appreciable rigidity or stiffness. The blades 48 of the upper set are disposed above a stop cross rod 51 formed of any suitable insulating material, preferably a phenolic resin. The rod 51 possesses substantial strength and rigidity and extends between the side plates 10 and 11 with its ends fixed therein. Each of the blades 48 has a short finger 48a bent downward at an obtuse angle and a short terminal portion or finger 48b bent reversely to finger 48aand extending in the same general direction ,as the main or body portion of the blade. The blades 48 of the upper set are of equal length and terminate a short distance from the cam assembly 41. The blades 50 of the lower set are similar and are parallel with and underlie the three blades 48 of the upper set remote fromthe frame side plate 11., Blade 49 of the lower set underlies the upper blade 48 which is second from side plate 11 and is provided, a short distance from its inner end, with a laterally projecting finger 49a which overlies finger 48b of upper blade 48 next adjacent side plate 11.. The blades 49 and 50 of the lower set are of uniform length, somewhat greater than that of the blades 48 of the upper set. Each of the blades 49 and 50 is provided at its inner end with a substantially U-shaped member in which is rotatably mounted a roller cam follower 52. The rollers 52 are held, by the inherent resiliency ofblades 49 and 50 in pressure contact with the corresponding portions of the cam assembly 41.

The fingers 48b of the switch blades 48 have contact elements 55 secured on their lower faces. The lower switch blades 491and 50, and finger 49a of blade 49, have contact elements '56 secured to their upper faces in alignment with and opposed to contact elements 55. In the rotation of the cam assembly 41, when the follower rollers 52 are on the dwells of the respective portions of cam assembly 41, the contact elements 56 of switch blade 49 and finger 49a thereof and of the adjacent switch blade 50, actuated by cam portion 41a, are held in pressure contact with the contact, elements 55 of the three corresponding switch blades 48, the contact element 56 of the switch blade 50 actuated by cam portion 41b is held in open circuit position, spaced fromcontactielement -55 of the corresponding blade 48, as in FIGURE 7, and the contact element 56 of blade 50 actuated by cam portion 410 isin pressure contact with contact element 55 of the corresponding blade 48, as in FIGURE 8. In the continued rotation of the cam assembly 41 the ribs 43 of portion 41a move the corresponding switch blades 49 and 50 outward, as in FIGURE 6, thereby opening the corresponding. circuits, the recess of portion 41b permits inward movement of the corresponding switch blade 58 to closed circuit position, and rib 45 of portion 41c moves the corresponding switch blade 50 outward to open circuit position briefly and then releases it for return to normal closed circuit position. Fine adjustment of the spacing of the contact elements maybe made by slight bending of the blades, without necessity for adjustment thereof in the block 14. In that manner, the supplementary circuits controlled by lower cam assembly 41 and associated elements are alternately closed'and opened in proper sequence and in predetermined relation to the opening and closing of the winker circuit above described.

In FIGURE 6, the blade 50 is shown in open circuit position, with the follower 52 resting on a rib 43 of inner portion 41a of cam assembly 41. The blade 49 and its finger 49a are then also in open circuit position, as will be understood. In the continued rotation of cam assembly 41 the blades 49 and .50 are released and moved inward to closed circuit position, due to their being under flexure, as aboveexplained. In like manner, the other switch blades 50 are released and move inward to closed circuit position. The pressure exerted by blade 49 flexes the two upper blades 48 corresponding to blade 49 and finger 49a thereof, a slight distance away from the stop cross rod 51. Such flexing of the blades 48 results in a rubbing or sliding movement between the contact ele ments 55 and 56 effective for maintaining them in a clean condition assuring good contact therebetween under, all normal operating conditions. That operation is shown more clearly in FIGURE 8, in which blade 50 is shown in its closed circuit position.

When blade 49 or 50 is moved to open circuit position it is flexed outwardly away from blades 48 effective for opening the contacts. The stop rod 51 is so disposed that when the contacts are open the blades 48 are flexed and under transverse tension, being then held by their inherent resiliency in-pressure contact with rod 51 in close proximity to the angle between the bent portion 48a and the body portion of the respective blades. During outward movement of the blade 49 or 50, the blades 48, being under flexure move outward into contact with the stop rod 51, which eifectively restrains them against further outward movement. The blade 49 or 50 continues to move a slight distance further outward after outward movement of blades 48 is stopped by rod 51, in the normal opening of the contacts. In the event of incipient welding together of the contact elements, the continued outward movement of blade 49 or 50 is effective for breaking the weld and thereby assuring opening of such elements. In that connection, the angularly bent portion 48a of the respective blades 48 is of importance. .The pull exerted in breaking a Weld is transmitted substantially lengthwise of portion 48a which is, in effect, anchored at its outer end to stop rod 51. Accordingly, the portion of the respective blades 48 extending inwardly beyond rod 51 is not readily flexible and offers sufiicient resistance to bending thereof to assure breaking of such welds as may occur.

Suitable known means, such as a circuit board 60, is provided for connecting the switch blades in the proper circuitry, as will be understood. The particular means employed for that purpose is not essential to my present invention, and any suitable known means may be used, as will be understood.

It will be understood that changes in detail may be resorted to without departing from the field and scope of my invention, and I intend to include all such variations, as fall within the scope of the appended claims, in this application in which the preferred form only of my invention has been disclosed.

Iclaim:

1. In a circuit interrupter, a cam, means for rotating said cam, a first switch blade having a cam follower and yieldingly urged toward said cam effectively holding said follower seated thereon, a second switch blade terminating short of said cam and opposed to and yieldingly urged toward said first blade, opposed contact elements on said blades, said cam being etfective for moving said first blade away from said second blade and releasing said first blade for movement toward said second blade thereby opening and closing said contact elements, and stop means comprising a rigid, fixedly positioned member located in the path of travel of the second blade to limit movement of said second blade toward said first blade to an extent less than the movement of said first blade in the opening of said contact elements.

2. In a circuit interrupter, a cam, means for rotating said cam, two opposed resilient switch blades of generally elongated form anchored at one end and extending therefrom in substantially parallel overlying relation toward said cam, one of said blades having a cam follower held by the inherent resiliency of said one blade seated on said cam and the other blade terminating short of said cam and being urged by its inherent resiliency toward said one blade, said blades having opposed contact elements spaced from said cam, the latter being elfective for moving said one blade away from said other blade and releasing said one blade for movement toward said other blade thereby opening and closing said contact elements, and a rigid, fixedly positioned stop member extending between said blades outward from said cam beyond said contact elements and disposed to limit movement of said other blade to an extent less than the movement of said one blade in the opening of said contact elements.

3. In a circuit interrupter, a cam, means for rotating said cam, two opposed resilient switch blades of generally elongated form anchored at one end and extending therefrom in substantially parallel overlying relation toward said cam, one of said blades having a cam follower held by the inherent resiliency of said one blade seated on said cam and the other blade terminating short of said cam and being urged by its inherent resiliency toward said one blade, the tree end portion of said other blade being bent to provide a first finger extending at an angle thereto toward said one blade and a second terminal finger extending from said first finger substantially parallel to the body portion of said other blade, said one blade and terminal finger of said other blade having opposed contact elements thereon, said cam being effective for moving said one blade away from said other blade and :for releasing said one blade for movement toward said other blade thereby opening and closing said contact elements, and a rigid, fixedly positioned stop member extending between said blades in proximity to the angle between said first finger and the body portion of said other blade and disposed to limit movement of said other blade to an extent less than the movement of said one blade in the opening of said contact elements.

4. In a circuit interrupter, a cam, means for rotating said earn, a plurality of resilient switch blades of generally elongated form anchored at one end and having at their other end cam followers held seated on said cam by the inherent resiliency of said blades, a second plurality of resilient switch blades of generally elongated form opposed to said first switch blades and urged by their inherent resiliency toward the latter, said second blades terminating short of said cam and said first and second blades having opposed contact elements, said cam being efiective for intermittently moving said first blades away from said second blades and releasing said first blades for movement toward said second blades thereby opening and closing said opposed contact elements, and rigid, fixedly positioned stop mea-ns extending between said blades effective for limiting movement of said second blades toward said first blades to an extent less than the movement of said first blades in the opening of said contact elements.

5. In a circuit interrupter, a cam, means for rotating said cam, a plurality of resilient switch blades of generally elongated form anchored at one end and having at their other end cam followers held seated on said cam by the inherent resiliency of said blades, a second plurality of resilient switch blades of generally elongated form opposed to said first switch blades and urged by their inherent resiliency toward the latter, said second blades terminating short of said cam and said first and second blades having opposed contact elements, said cam being effective for intermittently moving said first blades away from said second blades and releasing said first blades for movement toward said second blades thereby opening and closing said opposed contact elements, and an inflexible, nonyie'lding stop member extending between said two sets of blades and disposed to limit movement of said second blades toward said first blades to an extent less than the movement of said first blades in the opening of said contact elements.

6. In a circuit interrupter, a frame comprising spaced side plates, a cam between said plates, means for rotating said cam, a plurality of resilient switch blades of generally elongated form anchored at one end to said frame and having at their other ends cam followers held seated on said cam by the inherent resiliency of said blades, a second plurality of resilient switch blades of generally elongated form opposed to said first switch blades and anchored at one end to said frame and urged by their inherent resiliency toward said first blades, said second blades terminating short of said cam, the free end portions of said second blades being respectively bent to provide a first finger extending at an angle thereto toward a first blade and a second terminal finger extending from said first finger substantially parallel to the body portion of said second blade, said first blades and said second fingers of said second blades havingopposed contact elements thereon, said cam being efieetive for moving said first blades away from said second blades and for releasing said first blades for movement toward said second blades thereby opening and closing said contact elements, and an inflexible stop rod mounted in said side plates extending between said two sets of blades in proximity to the angles between the body portions and said first fingers of said second blade and fixedly positioned to limit movement of said second blades to an extent less 8 than the movement of said first blades in the opening of said contact elements.

References Cited by the Examiner UNITED STATES PATENTS 2,317,967 4/1943 Tuttle 200-6 X 2,644,062 6/1953 Wi'llia-ms 200-6 X ROBERT K. SCI-IAEFER, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2317967 *Nov 22, 1937Apr 27, 1943Tuttle & Kift IncElectric heater control
US2644062 *Oct 31, 1950Jun 30, 1953Gen ElectricSwitch
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3319198 *Jun 21, 1965May 9, 1967Johnson Matthey & Mallory LtdMiniature telephone interrupter switch
US3922923 *Mar 18, 1974Dec 2, 1975Deltrol CorpAutomatic control operating mechanism
US3930132 *Mar 18, 1974Dec 30, 1975Deltrol CorpProgram centralled, cam operated switch assembly
US4238656 *Mar 1, 1979Dec 9, 1980Heyrana Pablo MWaterproof multiple electrical switch assembly
US6399906 *Nov 2, 2000Jun 4, 2002Yamaichi Electronics Co., Ltd.Switch for a card connector
US6482029Apr 26, 2001Nov 19, 2002Yamaichi Electronics Co., Ltd.Card connector
US6638087Nov 2, 2000Oct 28, 2003Yamaichi Electronics Co., Ltd.Switch structure of card connector
US6692276Nov 2, 2000Feb 17, 2004Yamaichi Electronics Co., Ltd.Card connector
US6709281Dec 5, 2000Mar 23, 2004Yamaichi Electronics Co., Ltd.Write protect switch for card connector
US6848923Mar 18, 2003Feb 1, 2005Yamaichi Electronics Co., Ltd.Switch structure of card connector
US20030216074 *Mar 18, 2003Nov 20, 2003Yamaichi Electronics Co., Ltd.Switch structure of card connector
Classifications
U.S. Classification200/574, 200/246, 200/283
International ClassificationH01H19/62, H04M19/02, H04M19/00, H01H19/00
Cooperative ClassificationH01H19/62, H04M19/02
European ClassificationH04M19/02, H01H19/62