CA1156299A - Electrical switch - Google Patents
Electrical switchInfo
- Publication number
- CA1156299A CA1156299A CA000371698A CA371698A CA1156299A CA 1156299 A CA1156299 A CA 1156299A CA 000371698 A CA000371698 A CA 000371698A CA 371698 A CA371698 A CA 371698A CA 1156299 A CA1156299 A CA 1156299A
- Authority
- CA
- Canada
- Prior art keywords
- contact
- operating member
- base
- switch
- fixed
- 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
Links
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
- H01H19/10—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
- H01H1/00—Contacts
- H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved
-
- 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
Landscapes
- Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
- Contacts (AREA)
- Slide Switches (AREA)
Abstract
ABSTRACT
In an electric switch the contact portion of a fixed contact (3) is convex while the co-operating contact portion of a movable contact arm (5) is concave and of larger radius of curvature whereby lateral operating forces on the contact arm (5) cause the contact portions to roll rather than slide over each other in order to keep fretting to a minimum.
In an electric switch the contact portion of a fixed contact (3) is convex while the co-operating contact portion of a movable contact arm (5) is concave and of larger radius of curvature whereby lateral operating forces on the contact arm (5) cause the contact portions to roll rather than slide over each other in order to keep fretting to a minimum.
Description
~862 This invention relates to an electrical switch~
Many forms of electrical switch are known, in which a resilient movable contact arm is urged into engagement with a f ixed contact by means of an operating member in order to close the switch.
In some such switches the operating member doés not move solely longitudinally of the n.ovable contact arm, but moves transversely thereof, for example as in many rotary switches, and thus the movable contact arm does not perform only the up and down movement relative to the fixed contact required for making and breaking the connection, but is also moved transversely of its axis.
This transverse movement of the movable contact arm results in the surface of the contact portion of the arm belng rubbed across the surface of the co~operating contact portion of the fixed contact, such rubbing resulting in fretting of the contact surfaces. This fretting in time re~ults in so-called fretting corrosion of the contact surfaces, thus resulting in high, across-contact electrical resistance and possibly even non-electrical contact when the switch is closed.
According to this invention there is provided an electrical switch in which a resilient movable contact arm is urged into engagement with a fixed contact by means of an operating member in order to close the switch, the operating member moving transversely of the contact arm to effect such closure, in which the contact portion of the ,1~
1 15~299 contact arm has a conca~e surface facing the fixed contact, and the contact portion of the fixed contact has a convex surface facing the contact arm, the contact portion of the contact arm having a larger radius of curvature than the co-operating contact portion of the fixed contact.
In a switch according to this invention the surface of the contact por-tion of the contact arm rolls across the surface of the contact portion of the fixed contact on operation of the switch, and thus there is little if any fretting of the surfaces, and thus little if any fretting corrosion occurs.
Further, in view of this rolling action each part of the surface of the contact portion of the contact arm and of the surface of the contact portion of the fixed contact, is engaged by the other surface for only a small part of the time taken for operation of the switch, and thus any possibility of fretting of any part of either surface is kept to a minimum. In fact, the highest possibility of fretting will occur at the beginning of a closing and at the end of an opening operation of the switch, while in the actual contact position of the switch the operating member will be positioned over the fixed contact and axially aligned with the surfaces of the contact portions of the contact arm and fixed contact, in which position there is the minimum possibility of transverse movement of the surfaces relative to each other and thus of fretting.
This invention will now be described by way of .~
example with reference to the drawings in which:-Figure 1 is an exploded perspective view of arotary electrical switch according to the invention;
Figure 2 is a perspective view of the underside of the operating member of the switch of Figure l;
Figure 3 is cross-sectional view through the switch of Figure l;
Figure 4 is a diagram illustrating operation of known switches; and Figure 5 is a diagram illustrating operation of switches according to this invention.
The switch shown in Figures 1, 2 and 3 is similar to that described and claimed in Canadian Patent Application No. 333344, and comprises a circular base 1 moulded from electrically insulating plastics material, and carrying an input contact 2 and four fixed output contacts 3. The contacts 2 and 3 are press-fitted in the base 1, and each has an outwardly projecting pin portion for receipt in a hole in a substrate (not shown) thereby to connect the contact 2 or 3 to a conductor on the substrate which may be a printed circuit board. The inner ends of the output contacts 3 constitute contact portions the surfaces of which are convex, and project above the adjacent surface of the base 1, while the inner end of the input contact 2 has a flat head on which is welded a substantially planar bridging contact 5 having four resilient contact arms 6 associated with the four fixed output contacts 3 respectively.
The output contacts 3 are located at positions spaced at about 90 around the centre of the base 1 and at mutually Aifferent distances, that is radii, from the S centre of the base 1, and the input contact 2 is offset from the centre of the base 1 such that it is substantially equi-spaced from each of the output contacts 3. Thus, the effective lengths of the four contact arms 6 of the bridging contact 5 are also equal.
The base 1 is formed with an upstanding peripheral flange 7 within which is received a circular operating member 8 which completes the switch. The flange 7 has an inwardly directed segmented lip 9 which engages over a segmented annular shoulder 10 on the operating member 8 to mount the operating member 8 on the base 1.
The inner surface of the operating member B is formed with a plurality of arcuate cam projections 11 having mutually different radii measured from the centre of the operating member 8, that is from the axis of rotation thereof, which axis passes through the centre of the base 1.
There is at least one cam projection 11 having a radius of curvature equal to the distance of each of the output contacts 3 from the centre of the base 1. Each cam projection has end surfaces 12 which slope from the surface of the operating member 8 up to a level middle surface 13 which is parallel to the surface of the operating member 8.
The operating member 8 is formed with an outwardly directed bar 1~ which can be gripped by a user's fingers to rotate the operating member 8 relative to the base 1.
The flange 7 on the base 1 is divided into a plurality of circumferentially spaced segments 15 by slots 16. Two diametrically opposed segments 15 are narrower than the others and the lip portions 9' thereon are enlarged and engage in slots 17 in the shoulder 10 of the operating member 8 to provide an indexing action on rotation of the operating member 8 relative to the base 1, the slots 17 and lip portions 9' thu.s together defining a number of stable rotary positions of the operating member 8 relative to the base 1.
Each contact arm 6 of the bridging contact 5 comprises a single inner limb 18 extending from the input contact 2 and carrying at its outer end a three-legged arrangement comprlsing three outwardly extending ~ubstantially equal length legs 19 lying in a common plane.
The free end of the centre leg 19 constitutes a contact portion for engagement with the associated output contact 3 and is concave in transverse cross-section as seen by the output contact 3 and has a larger radius of curvature than the co-operating contact portlon of associated output contact 3. The two outer legs 19 are joined by an arcuate linking member 20 which extends towards the operating member 8 for engagement by the cam projection or projections 11 associated therewith.
The arrangement is such that when the linking member 1~56299 4862 20 of a contact arm 6 is not engaged with an associated cam projection 11 on the operating member ~, the centre leg 19 of that contact arm 6 is out of engagement with the associated output contact 3, as shown to the left in Figure 3, but when the operating member 8 is rotated relative to the base 1 to a position in which the linking member 20 is engaged by an associated projection 11, then the centre leg 19 is held in engagement with the associated output contact 3, as shown to the right in Figure 3, whereby the bridging contact 5 provides a connection between the input contact 2 and that output contact 3.
The cam projections 11 on the operating member 8 are arranged such that for each of the stable rotational positions of the operating member 8 relative to the base 1 a unique combination of connections between the input contact 2 and the output contacts 3 is established by the bridging contact 5, these connections enabling a coded decimal output to be obtained from the output contacts 3 from a voltage applied to the input contact 2.
The three-legged form of each of the contact arms 6 of the bridging contact 5 is advantageous in that it gives a two stage closing of the centre leg 19 on to the associated output contact 3, this ensuring ease of operation of the switch with a final high contact force between the centre leg 19 and the output contact 3. When the sloping surface 12 of a cam projection 11 first engages the linking member 20 of a contact arm 6, the 1 1562~9 whole contact arm 6 including the inner limb 18 is deflected abou~ the connection of t.he contact arm 6 to the input contact 2 until the surface of the contact portion of the centre leg 19 of the contact arm 6 engages the S associated output contact 3. Thereafter only the two outer legs 19 are deflected relative to the centre leg 19 thereby increasing the contact force between the contact portion of the centre leg 19 and the output contact 3 until the linking member 20 is engaged with the planar surface 13 of the cam projection 11. Further, since all three legs 19 are of substantially equal length whereby the linking member 20 engages the cam projection 11 substantially over the associated output contact 3 a high contact force is obtained for a relatively low applied force, and thus the switch is easy to operate.
In known switches, as shown in Figure 4, the surface of the contact portion of the centre leg 19 of each resilient contact arm 6 is planar, and the co-operating surface at the contact portion free end of the associated fixed output contact 3 is also planar. In such known swi.tches as the operating member 8 of the switch is moved to clo.se a particular contact arm 6 on to its associated fixed output contact 3, as indicated by the arrow in Figure 4, the leading sloping surface 12 of the cam projection 11 which is to effect the closure engages the linking member 20 of the contact arm 6, and moves the contact arm 6 towards the fixed contact 3, and the contact 1 15629~
portion of the contact arm 6 engages the fixed contact 3.
However, since the cam projection 11 is not moving solely longitudinally of the contact arm 6 but is moving transversely thereof, the contact arm 6 is not moved only downwards on to the fixed contact 3, but is moved across the fixed contact 3, and thus the surfaces of the contact portions of the contact arm 6 and fixed contact 3 are rubbed together this leading to fretting and corrosion as discussed above. Similarly such rubbing occurs when the operating member 8 is moved further to open the connection between the contact arm 6 and the fixed contact 3, as shown to the right in Figure 4. As is shown in Figure 4 such rubbing affects the whole surface of the contact portions of the contact arm 6 and fixed contact 3.
Referriny now to Figure 5, as described above, in the switch of this invention the surface of the contact portion of the fixed output contact 3 is convex as seen by the contact arm 6, and the co-operating surface of the contact portion (centre leg 19) of the contact arm 6 is concave as seen by the fixed contact 3, the contact portion of the contact arm 6 having a larger radius of curvature than the co-operating contact portion of the fixed contact 3.
With such an arrangement, on movement of the operating member to close a particular contact arm 6 on to its associated fixed output contact 3 the same transverse movement of the contact arm 6 relative to the fixed contact 1 1 5629~
3 as described with reference to Figure 4 occurs, but in view of t~.e shape of the co-operating contact portions, the contact portion of the contact arm 6 in effect rolls across the contact portion of the fixed contact 3 with the position of contact between the two portions moving across the surfaces thereof as shown from left to right in Figure 5.
Thus, there is little if any rubbing of the surfaces of the contact portions over each other, and fretting and corrosion are kept to a minimum. Further, the parts of the surfaces of the contact portions, which are in contact when the stable closed position is established, are not in contact during the periods of maximum transverse movement of the contact arm 6 relative to the fixed contact 3, that is when the linking member 20 is in engagement with the sloping surfaces 12 of the cam projection 11, and thus fretting of these parts of the surfaces of the contact portions is kept to an absolute minimum.
Although the possibility of fretting has been discussed above with reference to Figures 4 and 5 in relation to a rotary switch of the type shown in Figures 1 to 3, it will be appreciated that a switch in accordance with this invention can be of any type in which there is the possibili.ty of transverse movement of the resilient contact arm relative to the associated fixed contact with consequent possibility of fretting of the surfaces of the contact portions of the contact arm and fixed contact.
Many forms of electrical switch are known, in which a resilient movable contact arm is urged into engagement with a f ixed contact by means of an operating member in order to close the switch.
In some such switches the operating member doés not move solely longitudinally of the n.ovable contact arm, but moves transversely thereof, for example as in many rotary switches, and thus the movable contact arm does not perform only the up and down movement relative to the fixed contact required for making and breaking the connection, but is also moved transversely of its axis.
This transverse movement of the movable contact arm results in the surface of the contact portion of the arm belng rubbed across the surface of the co~operating contact portion of the fixed contact, such rubbing resulting in fretting of the contact surfaces. This fretting in time re~ults in so-called fretting corrosion of the contact surfaces, thus resulting in high, across-contact electrical resistance and possibly even non-electrical contact when the switch is closed.
According to this invention there is provided an electrical switch in which a resilient movable contact arm is urged into engagement with a fixed contact by means of an operating member in order to close the switch, the operating member moving transversely of the contact arm to effect such closure, in which the contact portion of the ,1~
1 15~299 contact arm has a conca~e surface facing the fixed contact, and the contact portion of the fixed contact has a convex surface facing the contact arm, the contact portion of the contact arm having a larger radius of curvature than the co-operating contact portion of the fixed contact.
In a switch according to this invention the surface of the contact por-tion of the contact arm rolls across the surface of the contact portion of the fixed contact on operation of the switch, and thus there is little if any fretting of the surfaces, and thus little if any fretting corrosion occurs.
Further, in view of this rolling action each part of the surface of the contact portion of the contact arm and of the surface of the contact portion of the fixed contact, is engaged by the other surface for only a small part of the time taken for operation of the switch, and thus any possibility of fretting of any part of either surface is kept to a minimum. In fact, the highest possibility of fretting will occur at the beginning of a closing and at the end of an opening operation of the switch, while in the actual contact position of the switch the operating member will be positioned over the fixed contact and axially aligned with the surfaces of the contact portions of the contact arm and fixed contact, in which position there is the minimum possibility of transverse movement of the surfaces relative to each other and thus of fretting.
This invention will now be described by way of .~
example with reference to the drawings in which:-Figure 1 is an exploded perspective view of arotary electrical switch according to the invention;
Figure 2 is a perspective view of the underside of the operating member of the switch of Figure l;
Figure 3 is cross-sectional view through the switch of Figure l;
Figure 4 is a diagram illustrating operation of known switches; and Figure 5 is a diagram illustrating operation of switches according to this invention.
The switch shown in Figures 1, 2 and 3 is similar to that described and claimed in Canadian Patent Application No. 333344, and comprises a circular base 1 moulded from electrically insulating plastics material, and carrying an input contact 2 and four fixed output contacts 3. The contacts 2 and 3 are press-fitted in the base 1, and each has an outwardly projecting pin portion for receipt in a hole in a substrate (not shown) thereby to connect the contact 2 or 3 to a conductor on the substrate which may be a printed circuit board. The inner ends of the output contacts 3 constitute contact portions the surfaces of which are convex, and project above the adjacent surface of the base 1, while the inner end of the input contact 2 has a flat head on which is welded a substantially planar bridging contact 5 having four resilient contact arms 6 associated with the four fixed output contacts 3 respectively.
The output contacts 3 are located at positions spaced at about 90 around the centre of the base 1 and at mutually Aifferent distances, that is radii, from the S centre of the base 1, and the input contact 2 is offset from the centre of the base 1 such that it is substantially equi-spaced from each of the output contacts 3. Thus, the effective lengths of the four contact arms 6 of the bridging contact 5 are also equal.
The base 1 is formed with an upstanding peripheral flange 7 within which is received a circular operating member 8 which completes the switch. The flange 7 has an inwardly directed segmented lip 9 which engages over a segmented annular shoulder 10 on the operating member 8 to mount the operating member 8 on the base 1.
The inner surface of the operating member B is formed with a plurality of arcuate cam projections 11 having mutually different radii measured from the centre of the operating member 8, that is from the axis of rotation thereof, which axis passes through the centre of the base 1.
There is at least one cam projection 11 having a radius of curvature equal to the distance of each of the output contacts 3 from the centre of the base 1. Each cam projection has end surfaces 12 which slope from the surface of the operating member 8 up to a level middle surface 13 which is parallel to the surface of the operating member 8.
The operating member 8 is formed with an outwardly directed bar 1~ which can be gripped by a user's fingers to rotate the operating member 8 relative to the base 1.
The flange 7 on the base 1 is divided into a plurality of circumferentially spaced segments 15 by slots 16. Two diametrically opposed segments 15 are narrower than the others and the lip portions 9' thereon are enlarged and engage in slots 17 in the shoulder 10 of the operating member 8 to provide an indexing action on rotation of the operating member 8 relative to the base 1, the slots 17 and lip portions 9' thu.s together defining a number of stable rotary positions of the operating member 8 relative to the base 1.
Each contact arm 6 of the bridging contact 5 comprises a single inner limb 18 extending from the input contact 2 and carrying at its outer end a three-legged arrangement comprlsing three outwardly extending ~ubstantially equal length legs 19 lying in a common plane.
The free end of the centre leg 19 constitutes a contact portion for engagement with the associated output contact 3 and is concave in transverse cross-section as seen by the output contact 3 and has a larger radius of curvature than the co-operating contact portlon of associated output contact 3. The two outer legs 19 are joined by an arcuate linking member 20 which extends towards the operating member 8 for engagement by the cam projection or projections 11 associated therewith.
The arrangement is such that when the linking member 1~56299 4862 20 of a contact arm 6 is not engaged with an associated cam projection 11 on the operating member ~, the centre leg 19 of that contact arm 6 is out of engagement with the associated output contact 3, as shown to the left in Figure 3, but when the operating member 8 is rotated relative to the base 1 to a position in which the linking member 20 is engaged by an associated projection 11, then the centre leg 19 is held in engagement with the associated output contact 3, as shown to the right in Figure 3, whereby the bridging contact 5 provides a connection between the input contact 2 and that output contact 3.
The cam projections 11 on the operating member 8 are arranged such that for each of the stable rotational positions of the operating member 8 relative to the base 1 a unique combination of connections between the input contact 2 and the output contacts 3 is established by the bridging contact 5, these connections enabling a coded decimal output to be obtained from the output contacts 3 from a voltage applied to the input contact 2.
The three-legged form of each of the contact arms 6 of the bridging contact 5 is advantageous in that it gives a two stage closing of the centre leg 19 on to the associated output contact 3, this ensuring ease of operation of the switch with a final high contact force between the centre leg 19 and the output contact 3. When the sloping surface 12 of a cam projection 11 first engages the linking member 20 of a contact arm 6, the 1 1562~9 whole contact arm 6 including the inner limb 18 is deflected abou~ the connection of t.he contact arm 6 to the input contact 2 until the surface of the contact portion of the centre leg 19 of the contact arm 6 engages the S associated output contact 3. Thereafter only the two outer legs 19 are deflected relative to the centre leg 19 thereby increasing the contact force between the contact portion of the centre leg 19 and the output contact 3 until the linking member 20 is engaged with the planar surface 13 of the cam projection 11. Further, since all three legs 19 are of substantially equal length whereby the linking member 20 engages the cam projection 11 substantially over the associated output contact 3 a high contact force is obtained for a relatively low applied force, and thus the switch is easy to operate.
In known switches, as shown in Figure 4, the surface of the contact portion of the centre leg 19 of each resilient contact arm 6 is planar, and the co-operating surface at the contact portion free end of the associated fixed output contact 3 is also planar. In such known swi.tches as the operating member 8 of the switch is moved to clo.se a particular contact arm 6 on to its associated fixed output contact 3, as indicated by the arrow in Figure 4, the leading sloping surface 12 of the cam projection 11 which is to effect the closure engages the linking member 20 of the contact arm 6, and moves the contact arm 6 towards the fixed contact 3, and the contact 1 15629~
portion of the contact arm 6 engages the fixed contact 3.
However, since the cam projection 11 is not moving solely longitudinally of the contact arm 6 but is moving transversely thereof, the contact arm 6 is not moved only downwards on to the fixed contact 3, but is moved across the fixed contact 3, and thus the surfaces of the contact portions of the contact arm 6 and fixed contact 3 are rubbed together this leading to fretting and corrosion as discussed above. Similarly such rubbing occurs when the operating member 8 is moved further to open the connection between the contact arm 6 and the fixed contact 3, as shown to the right in Figure 4. As is shown in Figure 4 such rubbing affects the whole surface of the contact portions of the contact arm 6 and fixed contact 3.
Referriny now to Figure 5, as described above, in the switch of this invention the surface of the contact portion of the fixed output contact 3 is convex as seen by the contact arm 6, and the co-operating surface of the contact portion (centre leg 19) of the contact arm 6 is concave as seen by the fixed contact 3, the contact portion of the contact arm 6 having a larger radius of curvature than the co-operating contact portion of the fixed contact 3.
With such an arrangement, on movement of the operating member to close a particular contact arm 6 on to its associated fixed output contact 3 the same transverse movement of the contact arm 6 relative to the fixed contact 1 1 5629~
3 as described with reference to Figure 4 occurs, but in view of t~.e shape of the co-operating contact portions, the contact portion of the contact arm 6 in effect rolls across the contact portion of the fixed contact 3 with the position of contact between the two portions moving across the surfaces thereof as shown from left to right in Figure 5.
Thus, there is little if any rubbing of the surfaces of the contact portions over each other, and fretting and corrosion are kept to a minimum. Further, the parts of the surfaces of the contact portions, which are in contact when the stable closed position is established, are not in contact during the periods of maximum transverse movement of the contact arm 6 relative to the fixed contact 3, that is when the linking member 20 is in engagement with the sloping surfaces 12 of the cam projection 11, and thus fretting of these parts of the surfaces of the contact portions is kept to an absolute minimum.
Although the possibility of fretting has been discussed above with reference to Figures 4 and 5 in relation to a rotary switch of the type shown in Figures 1 to 3, it will be appreciated that a switch in accordance with this invention can be of any type in which there is the possibili.ty of transverse movement of the resilient contact arm relative to the associated fixed contact with consequent possibility of fretting of the surfaces of the contact portions of the contact arm and fixed contact.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electrical switch in which a resilient movable contact arm is urged into engagement with a fixed contact by means of an operating member in order to close the switch, the operating member moving transversely of the contact arm to effect such closure, in which the contact portion of the contact arm has a concave surface facing the fixed contact, and the contact portion of the fixed contact has a convex surface facing the contact arm, the contact portion of the contact arm having a larger radius of curvature than the co-operating contact portion of the fixed contact.
2. A switch as claimed in claim 1, comprising a circular base of electric-ally insulating material carrying an input contact and a plurality of fixed output contacts, the input contact having mounted thereon a bridging contact having a plurality of resilient contact arms respectively associated with the fixed output contacts, and further comprising a circular operating member mounted on the base for rotary movement relative thereto, the inner surface of the operating member being formed with a plurality of cam projections adapted and arranged such that on rotation of the operating member the cam projections engage the contact arms of the bridging contact and urge the contact arms into engagement with the associated fixed output contacts, the operating member having a plurality of stable rotary positions relative to the base, in each of which positions a particular combination of the contact arms of the bridging contact is closed on to the associated fixed output contacts.
3. A switch as claimed in Claim 2, in which the base is formed with an upstanding peripheral flange having an inwardly directed lip which engage over an annular shoulder on the operating member to mount the operating member on the base.
4. A switch as claimed in Claim 3, in which the flange on the base is divided into a plurality of circumferentially spaced segments whereby the inwardly directed lip is segmented, at least one of the lip portions being adapted and arranged to engage in slots in the shoulder on the operating member thereby to provide an indexing action on rotation of the operating member relative to the base and define the stable rotary positions of the operating member relative to the base.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8008677 | 1980-03-14 | ||
| GB8008677 | 1980-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1156299A true CA1156299A (en) | 1983-11-01 |
Family
ID=10512091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000371698A Expired CA1156299A (en) | 1980-03-14 | 1981-02-25 | Electrical switch |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0036263B1 (en) |
| JP (1) | JPS56145616A (en) |
| AR (1) | AR227416A1 (en) |
| AT (1) | ATE8722T1 (en) |
| AU (1) | AU542438B2 (en) |
| BR (1) | BR8101503A (en) |
| CA (1) | CA1156299A (en) |
| DE (1) | DE3164956D1 (en) |
| ES (1) | ES8203163A1 (en) |
| MX (1) | MX148638A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217914A (en) * | 1983-05-25 | 1984-12-08 | オータックス株式会社 | Switch containing electronic circuit |
| GB2420448B (en) * | 2004-11-19 | 2007-11-28 | Invensys Controls Uk Ltd | Switching mechanism |
| CN109887792A (en) * | 2019-04-04 | 2019-06-14 | 江苏雷利电机股份有限公司 | Power switch, driving device and ice machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2850602A (en) * | 1955-05-16 | 1958-09-02 | North Electric Co | Relay contact arrangement |
| US3054879A (en) * | 1960-01-20 | 1962-09-18 | Indak Mfg Corp | Pushbutton switch |
| US3281552A (en) * | 1965-10-12 | 1966-10-25 | Ark Les Switch Corp | Cam operated rotary switch using leaf spring and overlying actuator |
| DE2406265A1 (en) * | 1974-02-09 | 1975-08-14 | Stahl R Fa | Contact for switchgear with two relatively moving elements - has ball shape forcibly providing two contact surfaces |
| AU517410B2 (en) * | 1978-03-17 | 1981-07-30 | Amp Incorporated | Selector switch with multiple output contacts |
-
1981
- 1981-02-18 AU AU67392/81A patent/AU542438B2/en not_active Ceased
- 1981-02-25 CA CA000371698A patent/CA1156299A/en not_active Expired
- 1981-03-03 EP EP81300876A patent/EP0036263B1/en not_active Expired
- 1981-03-03 AT AT81300876T patent/ATE8722T1/en not_active IP Right Cessation
- 1981-03-03 DE DE8181300876T patent/DE3164956D1/en not_active Expired
- 1981-03-06 ES ES500156A patent/ES8203163A1/en not_active Expired
- 1981-03-12 AR AR284594A patent/AR227416A1/en active
- 1981-03-12 MX MX186344A patent/MX148638A/en unknown
- 1981-03-13 BR BR8101503A patent/BR8101503A/en not_active IP Right Cessation
- 1981-03-13 JP JP3548281A patent/JPS56145616A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3164956D1 (en) | 1984-08-30 |
| JPS56145616A (en) | 1981-11-12 |
| ATE8722T1 (en) | 1984-08-15 |
| AU6739281A (en) | 1981-09-17 |
| BR8101503A (en) | 1981-09-15 |
| ES500156A0 (en) | 1982-02-16 |
| EP0036263A1 (en) | 1981-09-23 |
| EP0036263B1 (en) | 1984-07-25 |
| ES8203163A1 (en) | 1982-02-16 |
| AU542438B2 (en) | 1985-02-21 |
| MX148638A (en) | 1983-05-19 |
| AR227416A1 (en) | 1982-10-29 |
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