EP0002394A1 - Contact block for pushbutton and rotary switch - Google Patents

Contact block for pushbutton and rotary switch Download PDF

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Publication number
EP0002394A1
EP0002394A1 EP78300771A EP78300771A EP0002394A1 EP 0002394 A1 EP0002394 A1 EP 0002394A1 EP 78300771 A EP78300771 A EP 78300771A EP 78300771 A EP78300771 A EP 78300771A EP 0002394 A1 EP0002394 A1 EP 0002394A1
Authority
EP
European Patent Office
Prior art keywords
contact
contact device
housing
terminal connectors
handle
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.)
Withdrawn
Application number
EP78300771A
Other languages
German (de)
English (en)
French (fr)
Inventor
Robert James Johnston
Stephen George Layciak
Stephen Stanly Dobrosielski
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0002394A1 publication Critical patent/EP0002394A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/08—Bases; Stationary contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/503—Stacked switches
    • 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
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/03—Means for limiting the angle of rotation of the operating part
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/11—Movable parts; Contacts mounted thereon with indexing means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/60—Angularly-movable actuating part carrying no contacts
    • H01H19/63—Contacts actuated by axial cams
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H2009/305—Means for extinguishing or preventing arc between current-carrying parts including means for screening for arc gases as protection of mechanism against hot arc gases or for keeping arc gases in the arc chamber
    • 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
    • H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
    • H01H2011/0043—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches for modifying the number or type of operating positions, e.g. momentary and stable

Definitions

  • This invention relates generally to electric control switches and, more particularly, to an improved contact device suitable especially for use with manual control switches of the pushbutton and rotary types.
  • contact devices intended for use with electric control switches also need to be rugged and reliable, and in this respect miniaturization has been found to pose some problems, chief among them certain difficulties in mounting the internal component parts of such contact block securely in place with a minimum of hardware, and in preventing electric flashovers or arcing between conductive parts necessarily crowded closely together.
  • a contact device comprising an insulating housing defining a contact chamber therein, a contact structure disposed in said contact chamber and including contacts which are movable to closed and open position thereof through operation of the contact structure, an operating plunger for actuating the contact structure, and at least one pair of terminal connectors extending from the contact structure outwardly of the housing through openings in wall portions thereof, characterized in that each of said terminal connectors is a substantially Z-shaped member comprising an intermediate portion and contact-bearing and terminal portions extending in opposite directions with respect to each other from the opposite ends of said intermediate portion, and that said housing has disposed at each of said openings an interior flange which extends in substantially parallel spaced relationship with respect to the adjacent housing wall portion so as to define therewith a pocket having the intermediate portion of the associated terminal connector ; lodged and retained therein, said flange extending along- ; side said intermediate portion and forming an insulating barrier between the latter and said contact structure
  • the arrangement embodying the invention great facilitates the assembly of the contact device in that is enables the terminal connectors to be slipped in places simply by sliding their intermediate portions into the respective pockets, and, especially, results in a contact block having terminal connectors which (together with the stationary contacts on the contact-bearing portions thereof) are securely held in position by having their intermediate portions lodged and retained in the respective pockets, and wherein the same parts, viz, the interior flanges, which help to hold the terminal connectors in place also serve as insulating barriers effectively shieled- ing the closely spaced current-carrying parts of the contact structure and of the terminal conductors from one another.
  • the assembly of the contact device can be further simplified by providing one of the two housing parts with the wall portions which cooperate with the internal flanges to define the pockets, and providing the other housing part with the flanges.
  • This enables the terminal connectors to be readily inserted in their proper positions before the two housing parts are joined, and to be automatically and securely fixed in place when the housing part with the flanges thereon is placed upon and joined to the first-mentioned part.
  • a further object of the invention is to enable the contact device to be readily used in combination with another contact device or other contact devices of corresponding design, and accordingly it provides the housing of each such contact device with improved interlocking means, and preferably also with special screw receiving tubular portions, which will enable the various contact devices to be arranged and mechanically interlocked in tandem and/or in side-by-side relationship with respect to one another.
  • the switch generally designated in Fig. 1 with reference numeral 25 and shown as mounted on a panel 27 comprises an operating unit 29 and contact blocks 31, 33 arranged in tandenm.
  • the operating unit 29 comprises a housing 35, a clamp ring 37, a handle or actuating knob 39, a contact actuator 41, a detent means or detent cam 43, and an operating cam 45.
  • the housing 35 is a tubular member including a reduced portion 47 which extends through an aperture in the panel 27 and has a threaded end portion 49 on which the clamp ring 37 abutting the panel 27 is mounted and with which it is threadedly engaged, the clamp ring 37 being shown tightened so as, together with a shoulder 50 on the housing 35, to clamp the operating unit 29 securely in place on the panel 27.
  • a legend plate 51 around the clamp ring 37 is disposed on the panel 27.
  • the handle 39 is composed of an electrically insulating material and preferably is translucent to transmit light from a light source or bulb 53.
  • the handle 39 comprises a tubular portion 55 which is detachably mounted on the upper end of the contact actuator 41. As shown more particularly in Fig. 5, the tubular portion 55 comprises an end surface 57 and a pair of ears 59, 61 extending radially inward from the inner surface of the portion 55 and having end surfaces flush with the end surface 57.
  • the ears 59, 61 are not diametrically opposed, the angular spacing or arc between them being greater on one side than on the other.
  • tubular portion 55 includes a first pair of outwardly extending stop ribs 63, 65 which project longitudrnilly beyond the end surface 57, and the angular spacing or circular are between which is greater on one side thereof than on the other.
  • the tubular portion 55 includes a second pair of stop ribs 67, 69 which are wider than the ribs 63, 65, but which project from the end surface 57 the same distance 71 as the ribs 63, 65.
  • the tubular portion 55 also has spaced notches 73 to permit contraction of the portion 55 as it is snapped into and out f place on the contact actuator 41 when repositioning the handle from one mode to another, as described later herein.
  • the contact actuator 41 (Fig. 5) has next to the handle 39 an annular portion which includes a radial flange 75 and, adjacent thereto, a pair of diametrically opposed cam detents 86, and it has axially extending from said annular portion a cylindrical splined portion consist- i n g of a plurality of elongated segments or fingers 79 which are separated from each other through slots 77 and which have out-turned flanges 81 formed at the free ends thereof.
  • The-detent cam 43 which is annular, is slidably disposed on the splined portion of the contact actuator 41 and is resiliently held in engagement with the cam detents 86 by a spiral spring 83 (Fig. 1) disposed on the splined portion of the actuator 41 between the out-turned flanges 81 and the detent cam 43.
  • the detent cam 43 has a plurality of notches 85 formed in the annular end face thereof which cooperates with the cam detents 86, and has formed in its peripheral surface two diametrically opposed guide grooves 87 in which there are slidably received a pair of longitudinal guide portions (see Figs. 1 to 4) formed on and projecting from the inner peripheral surface of the housing 35.
  • the grooves 87 and the guide portions cooperate to guide the detent cam 43 for axial movement but to prevent rotational movement thereof.
  • the annular portion of the contact actuator 41 has formed in the end thereof a plurality, such as three, notches 93, 95, 97 in two of which the ears 59, 61 of the handle 39 are engaged, depending upon whether the switch is to be operated in two, three or four modes or positions.
  • the ears 59 and 61 would be disposed in the not-ches 95 and 97, respectively.
  • the ears 59 and 61 would be located in the notches 97 and 93, respectively.
  • either ear 59 or 61 could be in the notch 93, 95 or 97 because, as explained below, the portions of the ribs 63. 65, 67, 69 corresponding to the distance 71 would be removed.
  • Figs. 6, 7 and 8 The manner of operating the switch in the two, three, and four modes is illustrated in Figs. 6, 7 and 8, respectively.
  • the handle 39 In the two-mode operation, for which the handle 39 is mounted on the contact actuator 41 so that the ears 59 and 61 are engaged with the notches 95 and 97, respectively, the handle 39 is rotatable between two positions, namely, ON and OFF (see Fig. 9), as determined through the engagement of the stop rib 65 with the upper part of the guide portion 89 of the housing 35 occurring upon movement of the handle 39 from OFF to ON which causes the cam detents 86 to ride out of the respective notches 85a of the detent cam and into the notches 85b (see Fig.
  • the handle 39 is repositioned on the actuator 41 so that the ears 59 and 61 become engaged with the notches 95 and 97, respectively, whereupon the handle is rotatable to three positions designated in Fig. 10 as HAND, OFF and AUTO.
  • the detents 86 are in the respective notches 85b (Fig. 7) of the detent cam 43.
  • the detents 86 ride out of the associated notches 85b and into the notches 85a at which time the stop rib 67 will engage the upper end of the guide portion 89 and thereby arrest further rotation of the handle in the same direction, as indicated in solid lines in Fig. 7.
  • all of the stop ribs 63, 65, 67, 69 are shortened to an extent corresponding to the dimension 71 indicated in Fig. 5. This will enable the stop ribs 63, 65, 67, 69 to clear the guide portion 89 of the housing upon rotation of the handle 39, as seen from Fig. 8, and thus will enable the handle 39 to be rotated to the four positions designated in Fig. 11 as ON, OFF, RUN and JOG, corresponding to the detents 86 being lodged in the associated notches 85a, 85b, 85c and 85d, respectively, of the detent cam 43.
  • Rotation of the handle 39 beyond its ON position is prevented through engagement of one of the detents 86 with the guide portion 89 and of the other detent 86 with a projection 99 on the detent cam 43, as shown in solid lines in Fig. 8, whereas rotation of the handle 39 beyond the JOG position thereof is prevented through engagement of said one detent 86 with the projection 99 and of said other detent with the guide portions 89, as indicated in phantom lines in Fig. 8.
  • the operating unit 29 of the switch 101 shown in Fig. 12 includes a handle 103 which has a tubular portion 105 with a stop means comprising a longitudinal projection or flange 107 extending from adjacent one side of the tubular portion 105 in the axial direction thereof.
  • a tab 109 projects from the periphery of the tubular portion 105 at a location which is spaced from a radial flange 111 at angles other than 180° so as not to be diametrically opposed thereto.
  • the tab 109 preferably is provided with an index mark, such as an arrow 113.
  • the reduced portion 47 of the housing 35 includes a pair of diametrically opposed guide portions 115 and 117 which are similar to the guide portions 89, 91 (Fig. 1), except that the guide portion 117 terminates in a lower surface 119 (Fig. 14) and an adjacent projection 121 extending up to the level of the end of the guide portion 115.
  • the projection 121 has lateral stop surfaces 123 and 125 for limiting rotation of the handle 103.
  • the contact actuator 41 (Fig. 13) is provided with a plurality, such as three, tab-receiving notches 127, 129, 131, and with three slots 133, 135, 137, all formed in the end of the similar portion of the actuator.
  • a plurality such as three, tab-receiving notches 127, 129, 131, and with three slots 133, 135, 137, all formed in the end of the similar portion of the actuator.
  • the handle 103 is placed upon the actuator 41 so that the tab 109 is in the notch 129 with the numeral "3", and the radial flange 111 is in the slot 133. This will enable the handle 103, and consequently, the actuator 41 to be moved in 45° steps to OFF, HAND and AUTO positions.
  • the detents 86 are up against the stop surfaces 125 and 141, respectively, the handle 103 is in its HAND position.
  • the handle 103 is then mounted on the actuator 41 so that the tab 109 is engaged with the notch 131 marked "4", and the radial flange 111 is engaged with the slot 137, whereupon the handle can be rotated in 45° increments to four positions, such as the positions ON, OFF, RUN and JOG shown in Fig.
  • Rotation of the operating unit 29 of either switch 25 (Fig. 1) or switch 101 (Fig. 12) results in a corresponding rotation of the operating cam 45 which, in turn, actuates the contact blocks 31, 32 and 33, as described hereinafter.
  • the contact blocks which may be arranged in tandem, as seen from Fig. 1 or 12, or side-by-side, as shown in Figs. 17 to 22, arc of similar construction, each comprising, as shown particularly in Figs. 22 and 24, a pair of stationary contacts 155, a bridging contact carrier 157 carrying two movable contacts 153 and in turn supported on an operating plunger 149 or 151 in a conventional manner, such as shown in U.S. Patent No.
  • the stationary contacts 155 and the bridging contact carrier 157 together with the movable contacts 153 thereon are disposed in a contact chamber 159 (see Fig. 24) formed in an insulating housing which comprises opposite side walls 161, 162, opposite end walls 165, 167, and top and bottom walls 169, 171.
  • the plunger 149 or 151 extends movably through an opening in the top wall 169.
  • the side wall 161 and the end walls 165, 167 are formed integral with each other to constitute a cover
  • the side wall 162 and the top and bottom walls 169, 171 are formed integral with each other to constitute a base, the base and the cover being joined together in a suitable manner, preferably by welding.
  • each of the stationary contacts 155 is mounted on a generally Z-shaped terminal connector 173 comprising an inner or contact bearing portion 175, an outer or terminal portion 177, and an intermediate portion 179.
  • the outer portion 177 carries a terminal-screw-and-clamp assembly 181 enabling an external conductor (not shown), such as a stranded wire, to be connected thereto.
  • the intermediate portion 179 is disposed between the side wall 162 of the housing and a wall portion or flange 183 which extends inwardly of the latter end and has a surface 185 opposite the side wall 164 substantially equally spaced from the latter a distance substantially equal to the thickness of the intermediate portion 179.
  • the wall portion 183 is formed of an electrically insulating material, and preferably is molded integral with the housing from the same material, such as a clear thermoplastic.
  • the wall portion or flange 183 serves as an insulating barrier preventing electric arcs, such as may occur between the contacts 153 and 155, from jumping onto the intermediate portion 179 of the terminal connector; thus, it facilitates the extinction of such arcs.
  • terminal connectors 173 seated in the pockets thus formed between the side wall 162 and the respective barriers 183 are retained in their proper positions without the use of additional hardware when the housing base and cover are assembled.
  • the housings of the various contact blocks 31, 32, 33 are provided with integral means, including prongs 187 and recesses 189, which fit together to retain the blocks in tandem relationship with respect to each other, as shown in Fig. 23.
  • the blocks are provided in addition with tubular housing portions 191 having countersunk openings 193 extending therethrough and designed too for receiving screws 195 each of which comprises a threaded stem 197 and a head 199 having a threaded axial bore 203 formed therein.
  • Each screw 195 is inserted into the associated opening 193 so that its head 199 rests against the shoulder 201 within the opening, and its stem - 197 extends completely through the latter to be threadedly engaged with the threaded bore 203 of a similar, axially aligned screw 195 used in an adjacent tandem-connected contact block, if any, or if the respective contact block adjoins directly the operating unit 29, to be used in securing the contact block to the latter, such as by threadedly engaging the screws 195 with openings (not shown) formed in the lower side of the housing 35 of the operating unit 29.
  • the housings of the latter are also provided with interconnecting means, such as cooperating hooks 205, 207, extending from the side wall 161 of each contact block and engaged with the corresponding hooks of the adjacent block so as to hold the blocks of the two stacks together, as seen from Fig. 24 , as well as properly aliened with the operating unit 29.
  • interconnecting means such as cooperating hooks 205, 207, extending from the side wall 161 of each contact block and engaged with the corresponding hooks of the adjacent block so as to hold the blocks of the two stacks together, as seen from Fig. 24 , as well as properly aliened with the operating unit 29.
  • the manner in which the operating cam 45 is mounted on the lower end of the contact actuator 41 and how it cooperates with the plunger of the contact blocks 31, 32 is shown in Figs. 17-20.
  • the cam 45 is an annular member having cam surfaces 209, 211 (Fig. 1) and mounting spokes 213 (Fig. 5) extending radially inward of the annular member and spaced apart to fit slidably into the respective slots 77 of the contact actuator 41, as seen from Figs. 17-20.
  • the cam 45 rotates with it to actuate one or both plungers 149. 151 by virtue of its cam surfaces 209, 211. as shown in Fig. 17.
  • the contact actuator 41 is moved in the direction of the arrow 215 (Fig. 18) to depress both plungers 149, 151, while the operating cam; 45 is allowed to remain in its position due to its sliding connection with the actuator 41 formed by the spokes 213 and the stop 77.
  • the upper ends of the plungers 149. 151 overlap with both the cam surfaces of the operating cam 45 and the flanges 81 at the lower ends of the longitudinal actuator segments 79 so that the plungers 149, 151 are acted upon by the segments 79 of the actuator as well as by the cam surfaces 209, 211 of the cam 45.
  • one or more of the longitudinal segments 79 may be eliminated, as shown in Fig. 19 in order to disable the contact actuator 41 to the extent that, when depressed, it will not actuate one of the plungers, i.e. plunger 149 in Fig. 19, while actuating the other.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)
EP78300771A 1977-12-07 1978-12-07 Contact block for pushbutton and rotary switch Withdrawn EP0002394A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85832577A 1977-12-07 1977-12-07
US858325 1986-05-01

Publications (1)

Publication Number Publication Date
EP0002394A1 true EP0002394A1 (en) 1979-06-13

Family

ID=25328044

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300771A Withdrawn EP0002394A1 (en) 1977-12-07 1978-12-07 Contact block for pushbutton and rotary switch

Country Status (7)

Country Link
EP (1) EP0002394A1 (enrdf_load_stackoverflow)
JP (1) JPS5488683U (enrdf_load_stackoverflow)
BR (1) BR7808029A (enrdf_load_stackoverflow)
CA (1) CA1116220A (enrdf_load_stackoverflow)
ES (1) ES475776A1 (enrdf_load_stackoverflow)
GB (1) GB2010018B (enrdf_load_stackoverflow)
MX (1) MX144385A (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930859A (en) * 1956-03-29 1960-03-29 Cutler Hammer Inc Electric switches
US3018338A (en) * 1958-12-18 1962-01-23 Westinghouse Electric Corp Control switches
US3267246A (en) * 1964-03-23 1966-08-16 Honeywell Inc Actuating arrangement for tandem devices
FR2215683A2 (enrdf_load_stackoverflow) * 1973-01-29 1974-08-23 Pye Ltd
US4029924A (en) * 1974-10-10 1977-06-14 Westinghouse Electric Corporation Contact block interlock for electric switch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4217537Y1 (enrdf_load_stackoverflow) * 1965-02-18 1967-10-11

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930859A (en) * 1956-03-29 1960-03-29 Cutler Hammer Inc Electric switches
US3018338A (en) * 1958-12-18 1962-01-23 Westinghouse Electric Corp Control switches
US3267246A (en) * 1964-03-23 1966-08-16 Honeywell Inc Actuating arrangement for tandem devices
FR2215683A2 (enrdf_load_stackoverflow) * 1973-01-29 1974-08-23 Pye Ltd
US4029924A (en) * 1974-10-10 1977-06-14 Westinghouse Electric Corporation Contact block interlock for electric switch

Also Published As

Publication number Publication date
JPS5488683U (enrdf_load_stackoverflow) 1979-06-22
CA1116220A (en) 1982-01-12
GB2010018B (en) 1982-04-21
ES475776A1 (es) 1979-11-01
GB2010018A (en) 1979-06-20
BR7808029A (pt) 1979-07-31
MX144385A (es) 1981-10-05

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19791213

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18D Application deemed to be withdrawn

Effective date: 19830513

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LAYCIAK, STEPHEN GEORGE

Inventor name: JOHNSTON, ROBERT JAMES

Inventor name: DOBROSIELSKI, STEPHEN STANLY