CA1148198A - Thermally or mechanically actuated snap action type electric switch - Google Patents
Thermally or mechanically actuated snap action type electric switchInfo
- Publication number
- CA1148198A CA1148198A CA000361516A CA361516A CA1148198A CA 1148198 A CA1148198 A CA 1148198A CA 000361516 A CA000361516 A CA 000361516A CA 361516 A CA361516 A CA 361516A CA 1148198 A CA1148198 A CA 1148198A
- Authority
- CA
- Canada
- Prior art keywords
- switch
- arm
- actuator
- return movement
- contact carrying
- 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
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
- H01H37/5409—Bistable switches; Resetting means
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Push-Button Switches (AREA)
- Seasonings (AREA)
- General Preparation And Processing Of Foods (AREA)
Abstract
ABSTRACT
An electrical switch comprising a snap-acting actuator (22) movable with a snap action between two configurations to control the making and breaking of electrical contacts (3, 6), a latching member which, when the actuator blade has snap-acted in one sense to break or make the contacts restrains return movement of a movable contact carrying member (22) (which may be the actuator) to prevent re-making or re-breaking of the contacts until the latching member is positively displaced, the latching member comprising a spring member (7) having an arm (10) defining a portion (18) for restraining return movement of the movable contact carrying member (22), the engaging portion (18) being arranged to move in a direction substantially parallel to the plane of the actuator blade between a latching position and a non-latching position and being biassed towards the latching position, the spring member (7) also having an operating portion (12) at an angle to the arm (10) and movable in a direction generally transverse to said plane to cause movement of said engaging portion (18) from the latching to the non-latching position, so as to permit return movement of the movable contact carrying member.
An electrical switch comprising a snap-acting actuator (22) movable with a snap action between two configurations to control the making and breaking of electrical contacts (3, 6), a latching member which, when the actuator blade has snap-acted in one sense to break or make the contacts restrains return movement of a movable contact carrying member (22) (which may be the actuator) to prevent re-making or re-breaking of the contacts until the latching member is positively displaced, the latching member comprising a spring member (7) having an arm (10) defining a portion (18) for restraining return movement of the movable contact carrying member (22), the engaging portion (18) being arranged to move in a direction substantially parallel to the plane of the actuator blade between a latching position and a non-latching position and being biassed towards the latching position, the spring member (7) also having an operating portion (12) at an angle to the arm (10) and movable in a direction generally transverse to said plane to cause movement of said engaging portion (18) from the latching to the non-latching position, so as to permit return movement of the movable contact carrying member.
Description
" m ermally or Mechanically A~tuated 5nap Astion pe Electric Switch"
This invention relates to electric switches incorporating a snap-act-ing actuator comprising a stressed disc, sheet or strip of resilient sheet mate-rial (termed an actuator blade) mc~able with a snap-ac~ion between two configura-tions to control the making and breaking of the switch cont~cts, and a latching member which when the actuator bl~d~ has snap-acted in one sense to break or make the switch contacts restrains return movement of a movable contact carrying member to prevent re-making or re-breaking of the contacts i.e. the resetting of the switch until said latching member is positively displaced to Fermit return mcvement of the movable contact carrying member. Such switches will hereinafter be termed "switches of the kind described". The disc, sheet or strip of resil-ient material may be made of bimetallic material to provide a thermally-respon-sive switch or it may be made of suitable spring metal in which case the switch will be mechanically actuatable. The actuator blade itself may cc)nstitute the movable contact carrying member, or alternatively, the actuator blade may act upon a c~ntact carrying or controlling strip of resilient sheet material to make or break the cantacts.
mermally-responsive switches of the kind described find widespread use in many areas of technology, particularly for protecting apparatus and applianoes, such as electric motors or heaters, against c)verheating. The latch-ing me~ber prevents the occurrenoe of a cycling behaviour in that the switch re-quires to be reset before any further operation of the apparatus or applianoe can take pla oe. Otherwise the actuator blade would simply snap back into its original config~ration only to snap act yet again on further cverheating ~8~98 and perform cycles indefinitely.
Switches of the kind described are disclosed in United Kingdom Speci-fication No. 1036127 wherein the latching member is in the form of a spring arm extending transversely with respect to the actuator blade and movable trans-versely to the plane of movement of the blade between its latching and unlat-ching positions. To displace the latching member and reset the switch requires a movement of the resetting member again transversely to the plane of movement of the actuator blade. If this resetting member were to be disposed close to the blade or contacts it would interfere with the operation of the actuator or the switch terminals, so it was disposed in a location spaced from the actuator.
This however resulted in an undesirable increase in the overall size of the switch.
A further disadvantage of these known switches is that a substantial amount of movement of the actuator blade was required in order to release the latching member to spring into its latching position. This caused manufacturing difficulties since it needed to be ensured that actuator blades produced all possessed a sufficient amount of deflection to release the latching member.
It is an object of the invention to provide a switch of the kind des-cribed which does not have these disadvantages.
According to the invention there is provided an electric switch incor-porating a snap-acting actuator comprising a stressed member of resilient sheet material movable with a snap-action between two configurations to control the making and breaking of the switch contacts, and a latching member which would if the actuator member has snap-acted in one sense to break or make the switch contacts restrain return movement of a movable contact carrying member to prevent re-making or re-breaking of the contacts until said latching member is positively displaced to permit return movement of the movable contact member, ~., ~48198 wherein the latching member comprises a spring member having an arm extending generally transversely to the general plane of the actuator member, said arm defining an engaging portion for restraining return movement of the movable contact carrying member, said spring member also having an operating portion connected with said arm at an angle thereto and extending generally parallel to said actuator member, said operating portion being movable in a direction generally transverse to the general plane of the actuator member to cause move-ment of said engaging portion of said arm in a direction generally parallel to the general plane of said actuator member to permit return movement of said movable contact carrying member.
The engaging portion of the arm may engage the actuator member or blade or the contact carrying member where that member is separate from the actuator blade.
Thus the movement of the operating portion necessary for resetting the switch is in the direction of movement of the movable contact carrying member rather than transversely thereto and the difficulties mentioned earlier do not arise. Furthermore the operating portion and the engaging portion are inte-grally combined in a single spring member which is a substantial improvement in terms of manufacturing cost over previous switches where two or more compon-ents were provided to perform the same function.
Preferably the spring member is a spring strip and the operating por-tion is preferably bowed. Thus deflection of the central part of the operating portion causes the arm to pivot and the engaging portion to move in a direction substantially parallel to the general planes of the actuator blade and operatingportion. The amount of bowing of the operating portion will preferably be such that a slight deflection of the operating portion causes a fairly substantial movement of the engaging portion.
~r-~
~48198 A particularly convenient mounting of the spring member to the body of the switch is effected if the spring member is substantially U-shaped, i.e., the angled shape mentioned above with a further arm. In this way a wrap-around engagement of the spring member with the switch body may be obtained and the spring member can be mounted in position by means ôf its resilient engagement with the switch body.
In a preferred embodiment in which the engaging portion engages the actuator blade and in order to -3a-~.
, ~ . ~
~8198 remove the point(s) of action of the engaging portion away from the main body of the blade, the latter is formed with an extension tab adapted to be engaged by the engaging portion.
S In a preferred embodiment, the engaging portion of the arm of the spring member can comprise a bifurcated end of a spring strip which may bear against the actuator blade at two spaced locations in the latched postion. This feature enables the tolerances in the pressed end part of the spring strip to be increased as the spaced abutments thereby formed accurately determine the latched position of the blade by preventing excessive travel of the engaging portion transversely to the plane of movement of the actuator blade.
The bifurcations may for example comprise two spaced ears forme2 at the end of the engaging portion of the spring strip. The ears may be bent out of the general plane of the arm towards the main body of the blade so as to prevent excessive movement of the blade thus decreasing fatigue of the blade and increasing the operating life of the blade.
As an alternative to the end of the spring strip being bifurcated, the arm of the spring may have a slot therein, an extension tab of the actuator blade entering the slot in the latched position.
The tab then rests against one edge of the slot in the latched position, an opposite edge of the slot serving to prevent excessive movement of the blade.
In order that the invention may be readily understood two embodiments thereof will now be described by way of example with reference to the accompanying drawings in which:-Fig. 1 shows a longitudinal section through a switch according to the invention, Fig. 2 is a plan view of the switch of Fig. 1, Fig. 3 is a plan view of a second embodiment of a switch according to the invention, and Fig. 4 is a section through the embodiment .
~8198 of Fig. 3.
In Fig. 1 there is shown a moulded plastics switch body 1 having terminals 2, 14 extending therefrom.
One terminal 2 is connected to a switch contact 3 and the other terminal 14 is connected to the tongue 4 of a movable contact carrying member in the form of a known snap acting bimetallic actuator blade 22 which is mounted by means of the said tongue to the switch body 1. The bridge portion 5 of the actuator blade carries a movable contact 6.
A latching spring member in the form of a U-shaped copper alloy spring strip 7 is sprung around and then engaged to the switch body 1. The left hand arm 8 is formed with a flange 9 which engages lS about a shoulder on the switch body and serves to retain the spring strip on the body. The right hand arm or actuator blade engaging portion l0 is formed with a bifurcated actuator blade engaging end 11, and is resiliently biased in an anti clockwise direction to engage the actuator blade. The bridge or operating portion 12 of the U-shaped spring member is slightly bowed and it will be seen that upward pressure on this operating part will cause arm 10 to pivot clockwise (Fig. 1) and the end 11 will withdraw from the blade.
From Fig. 2 will be seen the extension tab 13 on the blade against which the end of the arm 10 engages, the arm 10 therefore being well spaced from contacts 3, 6. The tab 13 includes a narrow end portion 15 having a shoulder 16 on each side thereof. In the latched position of the switch, the portion 15 enters the gap between ears 17 of the bifurcated portion 11, and the shoulders 16 bear against the ears 17, thus preventing further anti-clockwise movement of the arm 10.
On reaching a predetermined temperature the blade snaps throug~ to open the contacts 3, 6 and this raising of the bridge portion 5 causes the arm 10 to deflect under its own resilience in an anti-~8198 clockwise direction and the portion 15 to engage the gap between the ears 17 and restrain the blade from snapping through to its original configuration on a drop in temperature.
To reset the blade, upward pressure is applied to bowed portion 12, causing the end 11 of arm 10 to move substantially parallel to the general plane of the blade and allow the latter to remake the contacts 3, 6. This pressure can be applied by a simple button, by rotation of a coarsely threaded member, or lateral movement of a wedge or otherwise.
In a modified embodiment, the bifurcated end 11 of the arm 10 comprises two ears which are bent out of the plane of arm 10 towards the main body lS of the blade, i.e. ta the left as seen in Fig. 1.
When the blade snap acts to open the contacts, excessive travel of the actuator blade is prevented by engagement with the ears.
The embodiment of Figs 3 and 4 is similar to that of Figs. 1 and 2 and identical parts have been given the same reference numerals. The features common to the two embodiments will not be further described.
In place of the bifurcated end 11 of the arm 10, the spring strip 7 has a rectangular slot 18 therethrough which the portion 15 of the tab 13 enters in the latched position of the switch. Thus, when the bimetallic actuator moves to break the contacts 3, 6, the portion 15 enters the slot 18 and further movement of the actuator is prevented by engagement of the portion 15 with the edge of the slot 18 which is shown as being uppermost in Fig. 4. Excessive actuator movement resulting in fatigue of the actuator is thus prevented. This feature can be enhanced by deformation of the portion of the arm 10 above the slot 18 towards the main body of the blade.
When the blade attempts to remake the contacts 3, 6, for example upon cooling, this is prevented by ~81~8 engagement of the portion 15 with the edge of the slot which is shown as being lowermost in Fig. 4.
In addition, the embodiment of Figs. 3 and ~ shows a reset slide member 19. The slide member 19 is biassed leftwardly as shown in the Figures by means of a coil spring 20. The member 19 includes a cam portion 21. When the slide member 19 is pushed rightwardly as shown in the Figures into the position indicated by broken lines in Fig. 4, against the force of the spring 20, the cam portion 21 exerts an upwardly directed force against the bowed portion 12 of the spring member 7, thus rotating the arm 10 of the spring member 7 in the anti-clockwise direction as shown in Fig. 4, thus allowing the actuator to make the contacts 3, 6. Once this has been done, and the member 19 is released, it returns to the illustrated position under the force of the spring 20.
This invention relates to electric switches incorporating a snap-act-ing actuator comprising a stressed disc, sheet or strip of resilient sheet mate-rial (termed an actuator blade) mc~able with a snap-ac~ion between two configura-tions to control the making and breaking of the switch cont~cts, and a latching member which when the actuator bl~d~ has snap-acted in one sense to break or make the switch contacts restrains return movement of a movable contact carrying member to prevent re-making or re-breaking of the contacts i.e. the resetting of the switch until said latching member is positively displaced to Fermit return mcvement of the movable contact carrying member. Such switches will hereinafter be termed "switches of the kind described". The disc, sheet or strip of resil-ient material may be made of bimetallic material to provide a thermally-respon-sive switch or it may be made of suitable spring metal in which case the switch will be mechanically actuatable. The actuator blade itself may cc)nstitute the movable contact carrying member, or alternatively, the actuator blade may act upon a c~ntact carrying or controlling strip of resilient sheet material to make or break the cantacts.
mermally-responsive switches of the kind described find widespread use in many areas of technology, particularly for protecting apparatus and applianoes, such as electric motors or heaters, against c)verheating. The latch-ing me~ber prevents the occurrenoe of a cycling behaviour in that the switch re-quires to be reset before any further operation of the apparatus or applianoe can take pla oe. Otherwise the actuator blade would simply snap back into its original config~ration only to snap act yet again on further cverheating ~8~98 and perform cycles indefinitely.
Switches of the kind described are disclosed in United Kingdom Speci-fication No. 1036127 wherein the latching member is in the form of a spring arm extending transversely with respect to the actuator blade and movable trans-versely to the plane of movement of the blade between its latching and unlat-ching positions. To displace the latching member and reset the switch requires a movement of the resetting member again transversely to the plane of movement of the actuator blade. If this resetting member were to be disposed close to the blade or contacts it would interfere with the operation of the actuator or the switch terminals, so it was disposed in a location spaced from the actuator.
This however resulted in an undesirable increase in the overall size of the switch.
A further disadvantage of these known switches is that a substantial amount of movement of the actuator blade was required in order to release the latching member to spring into its latching position. This caused manufacturing difficulties since it needed to be ensured that actuator blades produced all possessed a sufficient amount of deflection to release the latching member.
It is an object of the invention to provide a switch of the kind des-cribed which does not have these disadvantages.
According to the invention there is provided an electric switch incor-porating a snap-acting actuator comprising a stressed member of resilient sheet material movable with a snap-action between two configurations to control the making and breaking of the switch contacts, and a latching member which would if the actuator member has snap-acted in one sense to break or make the switch contacts restrain return movement of a movable contact carrying member to prevent re-making or re-breaking of the contacts until said latching member is positively displaced to permit return movement of the movable contact member, ~., ~48198 wherein the latching member comprises a spring member having an arm extending generally transversely to the general plane of the actuator member, said arm defining an engaging portion for restraining return movement of the movable contact carrying member, said spring member also having an operating portion connected with said arm at an angle thereto and extending generally parallel to said actuator member, said operating portion being movable in a direction generally transverse to the general plane of the actuator member to cause move-ment of said engaging portion of said arm in a direction generally parallel to the general plane of said actuator member to permit return movement of said movable contact carrying member.
The engaging portion of the arm may engage the actuator member or blade or the contact carrying member where that member is separate from the actuator blade.
Thus the movement of the operating portion necessary for resetting the switch is in the direction of movement of the movable contact carrying member rather than transversely thereto and the difficulties mentioned earlier do not arise. Furthermore the operating portion and the engaging portion are inte-grally combined in a single spring member which is a substantial improvement in terms of manufacturing cost over previous switches where two or more compon-ents were provided to perform the same function.
Preferably the spring member is a spring strip and the operating por-tion is preferably bowed. Thus deflection of the central part of the operating portion causes the arm to pivot and the engaging portion to move in a direction substantially parallel to the general planes of the actuator blade and operatingportion. The amount of bowing of the operating portion will preferably be such that a slight deflection of the operating portion causes a fairly substantial movement of the engaging portion.
~r-~
~48198 A particularly convenient mounting of the spring member to the body of the switch is effected if the spring member is substantially U-shaped, i.e., the angled shape mentioned above with a further arm. In this way a wrap-around engagement of the spring member with the switch body may be obtained and the spring member can be mounted in position by means ôf its resilient engagement with the switch body.
In a preferred embodiment in which the engaging portion engages the actuator blade and in order to -3a-~.
, ~ . ~
~8198 remove the point(s) of action of the engaging portion away from the main body of the blade, the latter is formed with an extension tab adapted to be engaged by the engaging portion.
S In a preferred embodiment, the engaging portion of the arm of the spring member can comprise a bifurcated end of a spring strip which may bear against the actuator blade at two spaced locations in the latched postion. This feature enables the tolerances in the pressed end part of the spring strip to be increased as the spaced abutments thereby formed accurately determine the latched position of the blade by preventing excessive travel of the engaging portion transversely to the plane of movement of the actuator blade.
The bifurcations may for example comprise two spaced ears forme2 at the end of the engaging portion of the spring strip. The ears may be bent out of the general plane of the arm towards the main body of the blade so as to prevent excessive movement of the blade thus decreasing fatigue of the blade and increasing the operating life of the blade.
As an alternative to the end of the spring strip being bifurcated, the arm of the spring may have a slot therein, an extension tab of the actuator blade entering the slot in the latched position.
The tab then rests against one edge of the slot in the latched position, an opposite edge of the slot serving to prevent excessive movement of the blade.
In order that the invention may be readily understood two embodiments thereof will now be described by way of example with reference to the accompanying drawings in which:-Fig. 1 shows a longitudinal section through a switch according to the invention, Fig. 2 is a plan view of the switch of Fig. 1, Fig. 3 is a plan view of a second embodiment of a switch according to the invention, and Fig. 4 is a section through the embodiment .
~8198 of Fig. 3.
In Fig. 1 there is shown a moulded plastics switch body 1 having terminals 2, 14 extending therefrom.
One terminal 2 is connected to a switch contact 3 and the other terminal 14 is connected to the tongue 4 of a movable contact carrying member in the form of a known snap acting bimetallic actuator blade 22 which is mounted by means of the said tongue to the switch body 1. The bridge portion 5 of the actuator blade carries a movable contact 6.
A latching spring member in the form of a U-shaped copper alloy spring strip 7 is sprung around and then engaged to the switch body 1. The left hand arm 8 is formed with a flange 9 which engages lS about a shoulder on the switch body and serves to retain the spring strip on the body. The right hand arm or actuator blade engaging portion l0 is formed with a bifurcated actuator blade engaging end 11, and is resiliently biased in an anti clockwise direction to engage the actuator blade. The bridge or operating portion 12 of the U-shaped spring member is slightly bowed and it will be seen that upward pressure on this operating part will cause arm 10 to pivot clockwise (Fig. 1) and the end 11 will withdraw from the blade.
From Fig. 2 will be seen the extension tab 13 on the blade against which the end of the arm 10 engages, the arm 10 therefore being well spaced from contacts 3, 6. The tab 13 includes a narrow end portion 15 having a shoulder 16 on each side thereof. In the latched position of the switch, the portion 15 enters the gap between ears 17 of the bifurcated portion 11, and the shoulders 16 bear against the ears 17, thus preventing further anti-clockwise movement of the arm 10.
On reaching a predetermined temperature the blade snaps throug~ to open the contacts 3, 6 and this raising of the bridge portion 5 causes the arm 10 to deflect under its own resilience in an anti-~8198 clockwise direction and the portion 15 to engage the gap between the ears 17 and restrain the blade from snapping through to its original configuration on a drop in temperature.
To reset the blade, upward pressure is applied to bowed portion 12, causing the end 11 of arm 10 to move substantially parallel to the general plane of the blade and allow the latter to remake the contacts 3, 6. This pressure can be applied by a simple button, by rotation of a coarsely threaded member, or lateral movement of a wedge or otherwise.
In a modified embodiment, the bifurcated end 11 of the arm 10 comprises two ears which are bent out of the plane of arm 10 towards the main body lS of the blade, i.e. ta the left as seen in Fig. 1.
When the blade snap acts to open the contacts, excessive travel of the actuator blade is prevented by engagement with the ears.
The embodiment of Figs 3 and 4 is similar to that of Figs. 1 and 2 and identical parts have been given the same reference numerals. The features common to the two embodiments will not be further described.
In place of the bifurcated end 11 of the arm 10, the spring strip 7 has a rectangular slot 18 therethrough which the portion 15 of the tab 13 enters in the latched position of the switch. Thus, when the bimetallic actuator moves to break the contacts 3, 6, the portion 15 enters the slot 18 and further movement of the actuator is prevented by engagement of the portion 15 with the edge of the slot 18 which is shown as being uppermost in Fig. 4. Excessive actuator movement resulting in fatigue of the actuator is thus prevented. This feature can be enhanced by deformation of the portion of the arm 10 above the slot 18 towards the main body of the blade.
When the blade attempts to remake the contacts 3, 6, for example upon cooling, this is prevented by ~81~8 engagement of the portion 15 with the edge of the slot which is shown as being lowermost in Fig. 4.
In addition, the embodiment of Figs. 3 and ~ shows a reset slide member 19. The slide member 19 is biassed leftwardly as shown in the Figures by means of a coil spring 20. The member 19 includes a cam portion 21. When the slide member 19 is pushed rightwardly as shown in the Figures into the position indicated by broken lines in Fig. 4, against the force of the spring 20, the cam portion 21 exerts an upwardly directed force against the bowed portion 12 of the spring member 7, thus rotating the arm 10 of the spring member 7 in the anti-clockwise direction as shown in Fig. 4, thus allowing the actuator to make the contacts 3, 6. Once this has been done, and the member 19 is released, it returns to the illustrated position under the force of the spring 20.
Claims (15)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electric switch incorporating a snap-acting actuator comprising a stressed member of resilient sheet material movable with a snap-action between two configurations to control the making and breaking of the switch contacts, and a latching member which would if the actuator member has snap-acted in one sense to break or make the switch contacts restrain return movement of a mov-able contact carrying member to prevent re-making or re-breaking of the con-tacts until said latching member is positively displaced to permit return movement of the movable contact member, wherein the latching member comprises a spring member having an arm extending generally transversely to the general plane of the actuator member, said arm defining an engaging portion for re-straining return movement of the movable contact carrying member, said spring member also having an operating portion connected with said arm at an angle thereto and extending generally parallel to said actuator member, said opera-ting portion being movable in a direction generally transverse to the general plane of the actuator member to cause movement of said engaging portion of said arm in a direction generally parallel to the general plane of said actuator member to permit return movement of said movable contact carrying member.
2. A switch as claimed in claim 1, wherein said movable contact carrying member comprises the actuator member.
3. A switch as claimed in claim 1 or claim 2, wherein said spring member comprises a further arm at the end of the operating portion opposite said arm so that the spring member is substantially U-shaped.
4. A switch as claimed in claim 1, wherein said spring member comprises a spring strip.
5. A switch as claimed in claim 4 wherein said operating portion is bowed and the arrangement is such that depression of said bowed operating portion causes the engaging portion to move in a sense to permit said return movement.
6. A switch as claimed in claim 1, wherein said arm includes means for preventing excessive travel of the movable contact carrying member.
7. A switch as claimed in claim 1 wherein said arm has a bifurcated end comprising two ears defining said engaging portion for restraining return movement of said contact carrying member.
8. A switch as claimed in claim 1, wherein said arm has a slot therethrough defining said engaging portion for restraining return movement of said movable contact carrying member.
9. A switch as claimed in claim 1, wherein said angle between said arm and said operating portion is substantially a right angle.
10. A switch as claimed in claim 1, wherein said engaging portion of said arm engages a tab of the actuator member for restraining return movement of the contact carrying member.
11, A switch as claimed in claim 10, wherein said tab has shoulders on each side thereof to bear against the engaging portion of the arm.
12. A switch as claimed in claim 1, further comprising a reset member for engagement with said operating portion of said spring member.
13. A switch as claimed in claim 12, wherein said reset member is slidable in a direction generally parallel to the general plane of the actuator member and comprises a cam for engagement with said operating portion.
14. A switch as claimed in claim 12, wherein said reset member is movable generally transverse to the general plane of the actuator member.
15. A switch as claimed in claim 14, wherein said reset member is threaded and is rotatable in a threaded aperture.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7934725 | 1979-10-05 | ||
| GB7934725 | 1979-10-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148198A true CA1148198A (en) | 1983-06-14 |
Family
ID=10508330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000361516A Expired CA1148198A (en) | 1979-10-05 | 1980-10-03 | Thermally or mechanically actuated snap action type electric switch |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS5678024A (en) |
| AU (1) | AU536888B2 (en) |
| CA (1) | CA1148198A (en) |
| DE (1) | DE3037499A1 (en) |
| DK (1) | DK417780A (en) |
| ES (1) | ES8200788A1 (en) |
| FR (1) | FR2466846A1 (en) |
| IT (1) | IT1128577B (en) |
| NO (1) | NO150259C (en) |
| NZ (1) | NZ195149A (en) |
| PL (1) | PL227073A1 (en) |
| SE (1) | SE8006950L (en) |
| YU (1) | YU253780A (en) |
| ZA (1) | ZA806132B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1036127A (en) * | 1962-03-15 | 1966-07-13 | Otter Controls Ltd | Improvements in or relating to snap action electric switches |
| GB1223481A (en) * | 1968-01-31 | 1971-02-24 | Solartron Electronic Group | Thermally-tripped switch |
| JPS5226172U (en) * | 1975-08-15 | 1977-02-23 |
-
1980
- 1980-10-03 ZA ZA00806132A patent/ZA806132B/en unknown
- 1980-10-03 ES ES495637A patent/ES8200788A1/en not_active Expired
- 1980-10-03 DE DE19803037499 patent/DE3037499A1/en not_active Withdrawn
- 1980-10-03 IT IT49808/80A patent/IT1128577B/en active
- 1980-10-03 YU YU02537/80A patent/YU253780A/en unknown
- 1980-10-03 FR FR8021197A patent/FR2466846A1/en active Granted
- 1980-10-03 CA CA000361516A patent/CA1148198A/en not_active Expired
- 1980-10-03 PL PL22707380A patent/PL227073A1/xx unknown
- 1980-10-03 SE SE8006950A patent/SE8006950L/en not_active Application Discontinuation
- 1980-10-03 NZ NZ195149A patent/NZ195149A/en unknown
- 1980-10-03 AU AU62949/80A patent/AU536888B2/en not_active Ceased
- 1980-10-03 DK DK417780A patent/DK417780A/en not_active Application Discontinuation
- 1980-10-03 NO NO802935A patent/NO150259C/en unknown
- 1980-10-04 JP JP13923280A patent/JPS5678024A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| IT1128577B (en) | 1986-05-28 |
| AU6294980A (en) | 1981-04-16 |
| PL227073A1 (en) | 1981-06-19 |
| NO150259C (en) | 1984-09-12 |
| FR2466846B1 (en) | 1984-12-14 |
| DE3037499A1 (en) | 1981-04-16 |
| SE8006950L (en) | 1981-04-06 |
| NO802935L (en) | 1981-04-06 |
| ES495637A0 (en) | 1981-11-01 |
| DK417780A (en) | 1981-04-06 |
| AU536888B2 (en) | 1984-05-31 |
| YU253780A (en) | 1982-08-31 |
| JPS5678024A (en) | 1981-06-26 |
| IT8049808A0 (en) | 1980-10-03 |
| FR2466846A1 (en) | 1981-04-10 |
| ZA806132B (en) | 1981-11-25 |
| ES8200788A1 (en) | 1981-11-01 |
| NO150259B (en) | 1984-06-04 |
| NZ195149A (en) | 1983-05-10 |
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