GB2173044A - Electromagnetic switch - Google Patents
Electromagnetic switch Download PDFInfo
- Publication number
- GB2173044A GB2173044A GB08607522A GB8607522A GB2173044A GB 2173044 A GB2173044 A GB 2173044A GB 08607522 A GB08607522 A GB 08607522A GB 8607522 A GB8607522 A GB 8607522A GB 2173044 A GB2173044 A GB 2173044A
- Authority
- GB
- United Kingdom
- Prior art keywords
- push button
- electromagnetic switch
- contact
- fixed contact
- main body
- 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.)
- Granted
Links
Classifications
-
- 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
- H01H13/68—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having two operating members, one for opening and one for closing the same set of contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/541—Auxiliary contact devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
- H01H1/26—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting with spring blade support
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Push-Button Switches (AREA)
Abstract
An electromagnetic switch has push button actuating switches provided in a casing 13 attached to the electromagnetic switch main body. The casing contains a pair of normally open contacts 15, 24 which are closable by a spring biased push button 18 to cause energisation of the operating coil, a pair of normally closed contacts 14, 23 which are separable by a spring biased push button 17 to cause deenergisation of the operating coil and a pair of holding contacts 15, 26 which are normally separated from each other by a contact operating rod 12 of the electromagnetic switch and which are closed, so as to maintain energisation of the coil, by the movement of the operating rod 12 when the electromagnetic switch is turned on by the push button 18. The three movable contacts 23, 24, 26 of the three contact pairs are formed on a single common contact member. The normally open fixed contact and the holding fixed contact are also formed on a single member. <IMAGE>
Description
SPECIFICATION
Electromagnetic switch with a push button switch
The present invention relates to an electromagnetic switch with a push button switch for opening and closing operations. More particularly, it relates to an electromagnetic switch having a push button switch for enabling contacts of the electromagnetic switch to have self-holding function.
Figure 1 is a diagram showing a contact self-holding circuit of an electromagnetic switch utilizing a conventional push button switch. In Figure, a simbol X indicates such conventional push button switch which is provided with a pair of on and off-push buttons 1, 2, a normally open fixed contact 3, a normally open movable contact 4, a normally closed fixed contact 5 and a normally closed movable contact 6. By depressing the on-push button, the normally open movable contact 4 which has been opened is brought into contact with the normally open fixed contact 3.
On the other hand, by depressing the off-push button 2, the normally closed movable contact 6 which has been closed is separated from the normally closed fixed contact 5 to be in a non-contact state.
The normally closed fixed contact 5 of the push button switch X is connected to a power source V through a lead wire A. The normally closed movable contact 6 is connected to the normally open movable contact 4 through a lead wire B, and the normally open movable contact 4 is, in turn, connected through a lead wire C to the fixed contact 7d of an unoccupied switch of the electromagnetic switch. A movable contact 8d of the switch W is connected to the normally open contact 3 to be operated by the on-push button 1 through a lead wire D, and the movable contact 8d is further connected through a lead wire E to an operating coil 9 of the electromagnetic switch main body which is, in turn, connected to the power source V.
In the contact self-holding circuit of the electromagnetic switch utilizing the push button switch having the construction as above-mentioned, when the on-push button 1 is depressed, for instance, the normally open movable contact 4 is brought into contact with the normally open fixed contact 3. In this case, if the off-push button 2 is not operated, a closed circuit including the operating coil 9 and the power source V is formed because the normally closed movable contact 6 is in contact with the normally closed fixed contact 5. Accordingly, the operating coil 9 is excited and the electromagnetic switch main body is actuated whereby movable contact points 8a-8b are respectively brought into contact with fixed contact points 7a-7d of four pole switches in the electromagnetic switch main body.Once the movable and fixed contact points 8d, 7d come into a mutually contacting state, the operating coil 9 is kept excited even though the depressing operation of the onpush button 1 is released because the operating coil 9 constitutes the closed circuit together with the power source V. Thus, the movable and fixed contact points 8a-8d and 7a-7d are kept in a state of contact, and the movable contact point 8d and the fixed contact point 7d function as self-holding contacts.
Cancellation of the self-holding state is carried out by depressing the off-push button 2.
Namely, when the off-push button 2 is depressed, the normally closed movable contact 6 is separated from the normally closed fixed contact 5 to thereby form an open circuit with respect to'the operating coil 9 and the power source V with the result that the operating coil 9 is not excited. Accordingly, the movable contact points 8a-8d are returned to the original state, namely, they are separated from the fixed contact points 7a-7d, whereby the self-holding function is cancelled.
The self-holding circuit is used for starting and stopping a load such as a motor.
Thus, in the conventional electromagnetic switch with a push button switch, a self-holding contact switch is not formed in the electrcmagnetic switch main body. Accordingly, use of the electromagnetic switch is limited only to that provided with a opening and closing switch of four poles even though a contact self-holding circuit is formed in the conventional electromagnetic switch with the push button switch. Further, there is a problem that lead wires for the self-holding circuit are long and wiring is complicated.
It is an object of the present invention to provide an electromagnetic switch with a push button switch which allows use of it as an electromagnetic switch provided with three pole switches even though a contact self-holding circuit is formed in the switch and which shortens the length of lead wires for the contact self-holding circuit.
The foregoing and the other objects of the present invention have been attained by providing an electromagnetic switch with a push button switch which comprises a push button casing attached to an electromagnetic switch main body; a normally open fixed contact and a normally closed fixed contact provided in the push button casing so as to be spaced apart from each other; an on-push button and an off-push button which are operably fitted to a push button cover under the condition that they are always urged toward the outside of the push button cover; a normally closed movable contact which is normally brought into contact with a normally closed fixed contact and is rendered to be in a non-contact state when the off-push button is depressed; a normally open movable contact which is normally separated from a normally open fixed contact and is brought into contact with the
normally open fixed contact when the on-push
button is depressed; a self-holding fixed contact provided in the push button casing; and self-holding movable contact which is forcibly
in contact with an operating rod held in the
electromagnetic switch main body and which
is normally in non-contact with the self-holding fixed contact and is brought into contact with the self-holding fixed contact when the electromagnetic switch main body operates.
Figure 1 is a diagram showing a contact
self-holding circuit of an electromagnetic
switch with a push button switch;
Figures 2-5 show an embodiment of the
present invention in which Figure 2 is a cross
sectional view of an important part of the
electromagnetic switch, Figure 3 is a schema
tic view showing a relation between a fixed
contact and a movable contact of the push
button switch, Figure 4 is a front view of the
push button switch, and Figure 5 is a diagram
of a contact self-holding circuit of the electro
magnetic switch with the push button switch;
Figure 6 is a-cross-sectional view of an im
portant part of the conventional electromag
netic switch with a push button switch;;
Figures 7-10 show another embodiment of
the present invention, in which Figure 7 is a
perspective view partly broken of an important gart of the electromagnetic switch, Figure 8 is diagram partly cross-sectioned which shows
a state just before assembling the push button
switch to the electromagnetic switch, Figure 9
is a diagram partly cross-sectioned which
shows a state that the push button switch is
assembled to the electromagnetic switch, and
Figure 10 is a longitudinal cross-sectional view
of an important part of the push button
switch in which the engaging members of the
switch are connected to the engaged mem
bers.
An embodiment of the present invention will
be described with reference to the drawings.
In Figures 2-5, the electromagnetic switch
of the present invention comprises an electro
magnetic switch main body 11, a cover 11 a covering the electromagnetic switch main
body 11 with a distance, and an operating rod
12. The operating rod is received in the main
body 11 and undergoes a reciprocating move
ment by a driving solenoid placed in the main
body 11 to open and close contacts (not
shown) included in the electromagnetic switch
main body 11.
A push button casing 13 made of an elec
tric-insulating material such as a resinous material is fitted to the electromagnetic switch
main body 11 and is provided with an open
ing in which the operating rod 12 is received.
A normally closed fixed contact 14 is pro
vided at an end of the push button casing 13
and a normally open fixed contact is provided
at the other side. The push button casing 13 is provided with an opening. A push button cover 16 made of a material such as resinous material is fitted to the opening to close it.
An off-push button 17 and an on-push button, each made of a resinous material, are fitted in the openings formed in the push button cover 16 in a juxtaposition so that they are movable in the openings but not removed from the openings. A spring bearing 19 is placed in the opening for receiving the off-push button. A coil spring 21 is interposed between the spring bearing 19 and the rear surface of the off-push button 17 to normally urge the offpush button 17 outwardly. A spring bearing 20 is placed in the opening for receiving the on-push button. A coil spring 22 is interposed between the spring bearing 20 and the rear surface of the on-push button 18 to normally urge the on-push button 18 outwardly. A normally closed movable contact 23 has a portion fixed at the central part of the push button casing 13 and has an free end having a contact 23a.The contact 23a is adapted to be normally in press-contact with the normally closed fixed contact 14 and is separated from the contact 14 when the off-push button 17 is depressed. A normally open movable contact 24 has a portion fixed to the central part of the push button casing 13 and has a free end having a contact 24a. The contact 24a is normally separated from the normally open fixed contact 15 and is brought into contact with the contact 15 when the on-push button 18 is depressed.
A reference numeral 25 designates a selfholding fixed contact provided in the push button casing 13 and a numeral 26 designates a self-holding movable contact having a portion fixed to the central part of the push button casing 13 and extending over the normally open movable contact 15. The self-holding movable contact 26 is provided with a bent portion 26a at its intermediate part which slantedly projects toward the electromagnetic switch main body 11 and a contact 26b at its free end as shown in Figure 2. The bent portion 26a is in press-contact with the upper surface of the head portion of the operating rod 12 received in the opening 13a formed in the push button casing 13. Accordingly, the contact 26b of the self-holding movable contact 26 is normally separated from the selfholding fixed contact 25 since the bent portion 26a is pushed out the opening 13a of the push button casing 13 by means of the operating rod 12 when the operating rod 12 is in a turning off state in accordance with a switching operation of the electromagnetic switch main body 11. However, the contact 26b is brought into contact with the self-holding fixed contact 25 because the bent portion 26a is extended into the opening 1 3a by retracting the head portion of the operating rod 12 in the opening 13a of the push button casing 13 when the operating rod 12 is in a turned-on state in accordance with a switching operation of the electromagnetic switch main body 11.
In the embodiment of the present invention, the normally closed movable contact 23, the normally open movable contact 24 and the self-holding movable contact 26 is formed by a single common movable contact 28, and the normally open fixed contact 25 and the selfholding fixed contact 25 are formed by a single common fixed contact 29 as shown in
Figure 3. In Figures 3 and 5, a simbol A designates a lead wire extending between the normally closed fixed contact 14 and a power source V which will be described below, and a simbol D designates a lead wire extending between the normally open fixed contact 15 and an operating coil 9 which will be described below.
In the circuit diagram shown in Figure 5, a simbol X designates a push button switch for an electromagnetic switch used in the embodiment of the present invention. The normally closed fixed contact 14 of the push button switch X is connected to the power source V through the lead wire A. In the embodiment, it is unnecessary to connect the normally closed movable contact 23, the normally open movable contact 24 and the self-holding movable contact 26 by means of the lead wires since these elements are formed by a single common movable contact 28. Further, it is unnecessary to connect the normally open fixed contact 15 and the self-holding fixed contact 25 by the lead wires since these elements are formed by a single common fixed contact 29.
The operating coil 9 as a driving coil of the driving solenoid (not shown) which is assembled in the electromagnetic switch main body 11 is connected to the power source V. The commonly used fixed contact 29 is connected to the operating coil 9 by the lead wire D.
In the embodiment of the present invention, the contacts placed in the electromagnetic main body are constituted by the movable contact points 8a-8d of four poles and the corresponding fixed contact points 7a-7d of four poles as shown in Figure 5. The movable contact points 8a-8d are moved by the driving solenoid (not shown) inclusive of the operating coil 9 in association with the operating rod 12.
In the contact self-holding circuit of the electromagnetic switch utilizing the push button switch having the construction as above-mentioned, the normally open movable contact 24 of the common movable contact 28 is brought into contact with the normally open fixed contact 15 of the common fixed contact 29 when the on-push button 18 is depressed, and the normally closed movable contact 23 is in contact with the normally closed fixed contact 14 when the off-push button 17 is not operated.Accordingly, a closed circuit including the operating coil 9 and the power source V is formed whereby the electromagnetic switch main body 11 is actuated by the excitation of the operating coil 9, and the movable contact points 8a-8d of four poles are respectively brought into contact with the fixed contact points 7a-7d. At the moment, the operating rod 12 of the electromagnetic switch main body 11 is moved due to the turning-on operation with the result that the head portion of the operating rod 12 received in the opening 13a of the push button casing 13 is removed from the opening 13a as shown in Figure 2.Accordingly, the bent portion 26a formed in the self-holding movable contact 26 of the common movable contact 28 enters into the opening 1 3a when the operating rod 12 is operated so that it is brought into contact with the self-holding fixed contact 25 of the common fixed contact 29.
In this case, when the depressing operation of the on-push button 18 is released, the closed circuit including the operating coil 9 and the power source V is maintained. Accordingly, the operating coil 9 is kept excited and the movable and fixed contact points 8a-8d and 7a-7d are kept in a contacting state thereby providing self-holding function of the contacts.
Cancellation of the self-holding function of the contacts is carried out by depressing the off-push button 17. That is, when the offpush button 17 is depressed, the normally closed movable contact 23 of the common movable contact 28 is separated from the normally closed fixed contact 14 to form a open circuit in which the operating coil 9 and the power source V are included thereby rendering the operating coil 9 to be in a nonexcited state. Accordingly, the movable contact points 8a-8d are separated from the fixed contact points 7a-7d respectively to be returned to the original positions.At this moment, the operating rod 12 is subjected to turning-off operation and the head portion of the operating rod enters into the opening 13a of the push button casing 13 so that the bent portion 26a of the self-holding movable contact 26 is pushed to move the self-holding movable contact 26 toward the push button cover 16. As a result, the self-holding movable contact 26 is separated from the selfholding fixed contact 25; thus, contact selfholding function of the contact points 8a-8d and 7a-7d contained in the electromagnetic switch main body 11 is cancelled.
In the above-mentioned embodiment, the push button switch X for the electromagnetic switch is provided with the seld-holding movable and fixed contacts 26, 25 which are moved in association with the operating rod 12. Accordingly, for an electromagnetic switch having four pole switches, it is possible to use opening and closing switches of three poles for a three phase power source and to use a opening and closing switch of an additional pole for the other usage by using the contacts 25, 26 as a self-holding switch of the contact self-holding circuit of an electromagnetic switch. It is possible to prepare an electromagnetic switch having opening and closing switches of three poles as an electromagnetic switch with a push button switch which is capable of self-holding.
In the above-mentioned embodiment of the present invention in which the push button switch X has the self-holding movable and fixed contacts 26, 25, it is no longer necessary to use the lead wires C, D for the movable contact point 8d and the fixed contact point 7d, the lead wires having been utilized for the normally open movable contact 24 and the normally open fixed contact 15 for the purposed of self-holding of the electromagnetic switch main body as an external switching elements, with the consequence that wiring operations can be easy. Further, the selfholding movable contact 26, the normally open movable contact 24 and the normally closed movable contact 23 are constituted by the single common movable contact 28, and the self-holding fixed contact 25 and the normally open fixed contact 15 are constituted by the single common fixed contact 29.Accordingly, wiring operations for connecting elements placed in the main body are unnecessary. Further, the lead wires required for outer connection can be partly eliminated. In addition, the number of parts to be used can be small since some parts are formed in one piece whereby the manufacturing cost is reduced and assembling works become easy.
Figures 7 to 10 show another embodiment of the present invention. The embodiment concerns improvement in a structure for fitting the push button casing to the electromagnetic switch main body.
For easy understanding of the embodiment according to the present invention, construction of a conventional push button casing will be described with reference to Figure 6 showing in longitudinal cross-section the important part in which the push button switch is fitted to the electromagnetic switch main body 11.
Figure 6 is so depicted that the electromagnetic switch main body 11 is turned by 90" from the position of the main body as shown in Figures 2-4 and the push button switch is mounted on the main body 11.
In Figure 6, the same reference numerals as in Figures 1-5 designate the same or corresponding parts. A numeral 30 designates a fixed contact having fixed contact points 8a-8d, a numeral 31 designates a movable contact inserted in a window 32 formed in the operating rod 12. It is assumed that each four movable and fixed contacts 31, 30 are arranged in the electromagnetic switch main body as in the above-mentioned embodiment even though they are not shown specifically.
A reference numeral 33 designates a fitting metal for fixing the push button switch X to the outer casing of the electromagnetic switch main body 11, a numeral 34 designates a fixed terminal which is formed by extending the fixed contact 30, a numeral 35 designates a screw for fastening the fixed terminal together with the fitting metal 33 to the outer casing of the electrcmagnetic switch main body 11, and a simbol L indicates the center line of the operating rod 12.
In the conventional electromagnetic switch, when the push button casing 13 is to be fitted at the inner side of the cover 11 a of the electromagnetic switch main body 11, it is necessary to fix the push button casing 13 to the fitting metal 33 which has been secured to the fitting part of the electromagnetic switch main body 11 together with the fixed terminal 34 by means of the screw 5. Accordingly, it is not easy to carry out assembling operations and a large space is required to provide electrical insulation for a fitting part for the push button casing 13 of the push button switch X since the push button casing is electrically connected to the fixed terminal 34 and the fitting metal 33 as electric conduction elements.
The embodiment as shown in Figures 7 to 10 is to provide an electromagnetic switch with a push button switch which facilitates easily fitting of the push button switch to the electromagnetic switch, is difficult to detach after once assembled, and improves insulating properties.
In Figures 7 to 10, numerals 40, 40 designate a pair of engaged members having an Lshape in cross-section which project from the upper surface of the outer casing of the electromagnetic switch main body 11 in parallel with each other and with its L-shaped portion directing outwardly. The engaged members are formed integrally with the outer casing. A numeral 41 designates a position-determining member formed at one end part of each opposed surface of the engaged members 40 and a numeral 42 designates a projection for locking which is formed at the center of one end of the electromagnetic switch main body 11.
The push button casing 13 similar to that described in the above-mentioned embodiment includes a plurality of switching elements. A push button cover 16 is put on the push button casing 13. A pair of engaging members 43, 43 each having an L-shape in cross-section which project from and are formed integrally with the lower surface of the push button casing 13 in parallel with each other, the
L-shaped portion of each engaging member directing inwardly. A stopper member 44 is provided at the central part of the lower surface of the push button casing 13 (at the left part in Figure 8) so as to be horizontally extended. A numeral 45 designates an engaging piece formed at the lower surface of the stopper member 44.The other parts correspond ing to those in the above-mentioned embodiment are designated by the same reference numerals and description of these parts is, therefore, omitted.
Assembling operation for the electromagnetic switch having the above-mentioned construction is carried out as follows. Firstly, the push button switch X is moved from the right side to the left side along the electromagnetic switch main body 11 as shown in the arrow mark as shown in Figures 7 and 8. Then, the pair of engaging members 43, 43 of the push button switch X is slidingly fitted into the pair of engaged members 40, 40 formed on the upper surface of the electromagnetic switch main body 11. Since, the L-shaped portion of each of the engaged members 40 is directed outwardly and the L-shaped portion of each of the engaging members 43 of the push button switch X is directed inwardly, movement of the push button switch X in the lateral direction of the electromagnetic switch main body 11 is blocked and the vertical movement of the push button switch X is also blocked.
The push button switch X is further forwarded in a slide-fitting state between the engaged members 40 and the engaging members 43. Then, the sliding movement is stopped by striking of the stopper member 44 formed at the central part of the lower surface of the push button casing 13 against the position-determining member 41; thus the position of the push button switch X is established. At the moment of determination of position by the stopper 44, the engaging piece 45 formed at the lower surface of the stopper member 44 is engaged with the projection for locking 42. Thus, the assembling operation of the push button switch X to the upper surface of the electromagnetic main body 11 is completed.Engagement of the engaging piece 45 with the projection 42 in the assembling operation of the push button switch X prevents the push button switch X from moving on the upper surface of the electromagnetic switch main body 11.
When the engaging members 43 of the push button switch X is engaged with the engaged members 40 of the electromagnetic switch main body 11, the movable contact 26 of the push button switch X can easily ride on the head portion of the operating rod 12 projecting from the upper surface of the main body 11 since the movable contact 26 has the bent portion which slantedly projects toward the operating rod 12. After the push button switch X is assembled, the movable contact 26 is attached to or detached from the fixed contact 15 by the movement of the operating rod 12 thereby performing switching operations as in the above-mentioned embodiment.
Thus, in the embodiment of the present invention, easy assembling operation can be obtained by sliding the push button switch X on the upper surface of the electromagnetic switch main body 11.
As described above, in accordance with the present invention, the push button switch X is provided with self-holding function for contacts of an electromagnetic switch main body whereby the electromagnetic switch main body can be as a whole miniaturized. Further, when the self-holding movable contact, the normally open movable contact and the normally closed movable contact are constituted by a single common movable contact, and the self-holding fixed contact and the normally open fixed contact are constituted by a single common fixed contact, lead wires used for connection between the contacts and the power source can be eliminated. Further, reduction in the number of elements to be assembled causes increase of efficiency of assembling works.
Claims (9)
1. An electromagnetic switch with a push button switch comprising an electromagnetic switch main body having an operating rod (12) which is moved in association with opening and closing operations of the contacts, and a push button casing (13) attached to said electromagnetic switch main body, characterized in that said push button casing is provided with::
a normally open fixed contact (15) and a normally closed fixed contact (14) placed at a distance,
a pair of on-push button (18) and off-push button (17) which are always urged to project outwardly,
a normally closed movable contact (23) which is normally brought into contact with said normally closed fixed contact (14) and is separated from the same when said off-push button (17) is depressed,
a normally open movable contact (24) which is normally separated from said normally open fixed contact (15) and is brought into contact with the same when said on-push button (18) is depressed,
a self-holding fixed contact (25) and,
a self-holding movable contact (26) which is normally separated from said self-holding fixed contact (25) by a force of said operating rod (12) of the electromagnetic switch main body (11), and which is brought into contact with said self-holding fixed contact (25) due to the movement of said operating rod (12) when said electromagnetic switch main body is turned on.
2. An electromagnetic switch with a push button switch according to Claim 1, wherein said normally closed movable contact 23, said normally open movable contact 24 and said self-holding movable contact 26 are constituted by a single common movable contact 28.
3. An electromagnetic switch with a push button switch according to Claim 1, wherein said normally open fixed contact 15 and said self-holding fixed contact 25 are constituted by a single common fixed contact 29.
4. An electromagnetic switch with a push button switch according to Claim 1, wherein a pair of engaged members 40 each having an
L-shaped in cross-section are formed on the front surface of said electromagnetic switch main body 11; position-determining members 41 are formed on the mutually opposed surfaces of said engaged members; a projection for locking is- formed on the front surface of said electromagnetic switch main body; a pair of engaging members 43 each having an Lshape in cross-section are formed on the fitting surface of said push button casing so that they are engaged with said pair of engaged members; and a stopper member 44 is so formed that the position of said casing is determined by letting said engaging members touch said engaged members, said stopper being provided with an engaging piece 45 for preventing a sliding movement of said push button casing 13 by the engagement with said projection 42.
5. An electromagnetic switch with a push button switch according to Claim 4, wherein said engaged members 40, said position determining member 41 and said projection for locking 42 are respectively formed integrally with walls of said electromagnetic switch main body.
6. An electromagnetic switch with a push button switch according to Claim 4, wherein said engaging members 43 and said stopper member 44 are respectively formed integrally with said push button casing 13.
7. An electromagnetic switch with a push button switch according to Claim 1, wherein said self-holding movable contact 26 is provided with a projection projecting toward said operating rod at an angle so that it is urged by said operating rod 12.
8. An electromagnetic switch with a push button switch according to Claim 1, wherein said push button casing receives springs 21, 22 for resiliently urging said on-push button 18 and said off-push button 17 outwardly.
9. An electromagnetic switch as claimed in claim 1, substantially as described with reference to the drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6375785A JPS61225729A (en) | 1985-03-29 | 1985-03-29 | Solenoid switch with push button switch |
| JP6375885A JPS61225730A (en) | 1985-03-29 | 1985-03-29 | Push button switch for electromagnetic switch |
| JP6375985A JPS61225722A (en) | 1985-03-29 | 1985-03-29 | Push button switch for solenoid switch |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8607522D0 GB8607522D0 (en) | 1986-04-30 |
| GB2173044A true GB2173044A (en) | 1986-10-01 |
| GB2173044B GB2173044B (en) | 1989-01-18 |
Family
ID=27298276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08607522A Expired GB2173044B (en) | 1985-03-29 | 1986-03-26 | Electromagnetic switch with a push button switch |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2173044B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3107402A1 (en) * | 2020-02-13 | 2021-08-20 | C&K Components Sas | NORMALLY CLOSED TYPE ELECTRIC SWITCH WITH AN INITIAL DELIVERY STATE WITH OPEN CONTACT |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109509663A (en) * | 2018-12-12 | 2019-03-22 | 太仓神明电子有限公司 | A kind of control switch |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB227118A (en) * | 1923-12-31 | 1925-08-13 | British Thomson Houston Co Ltd | Improvements in and relating to electromagnetic devices |
| GB351221A (en) * | 1929-06-08 | 1931-06-25 | British Thomson Houston Co Ltd | Improvements in and relating to electric switches |
| GB393653A (en) * | 1931-12-11 | 1933-06-12 | Allen West & Co Ltd | Improvements in electric motor starters |
| GB649751A (en) * | 1948-10-29 | 1951-01-31 | British Thomson Houston Co Ltd | Improvements in and relating to automatic controllers for electric motors |
| GB841436A (en) * | 1956-04-21 | 1960-07-13 | App V F B | Electromagnetic circuit-breakers |
| GB1022811A (en) * | 1962-11-07 | 1966-03-16 | Westinghouse Electric Corp | Improvements in or relating to switching apparatus |
-
1986
- 1986-03-26 GB GB08607522A patent/GB2173044B/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB227118A (en) * | 1923-12-31 | 1925-08-13 | British Thomson Houston Co Ltd | Improvements in and relating to electromagnetic devices |
| GB351221A (en) * | 1929-06-08 | 1931-06-25 | British Thomson Houston Co Ltd | Improvements in and relating to electric switches |
| GB393653A (en) * | 1931-12-11 | 1933-06-12 | Allen West & Co Ltd | Improvements in electric motor starters |
| GB649751A (en) * | 1948-10-29 | 1951-01-31 | British Thomson Houston Co Ltd | Improvements in and relating to automatic controllers for electric motors |
| GB841436A (en) * | 1956-04-21 | 1960-07-13 | App V F B | Electromagnetic circuit-breakers |
| GB1022811A (en) * | 1962-11-07 | 1966-03-16 | Westinghouse Electric Corp | Improvements in or relating to switching apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3107402A1 (en) * | 2020-02-13 | 2021-08-20 | C&K Components Sas | NORMALLY CLOSED TYPE ELECTRIC SWITCH WITH AN INITIAL DELIVERY STATE WITH OPEN CONTACT |
| FR3107393A1 (en) * | 2020-02-13 | 2021-08-20 | C&K Components Sas | NORMALLY CLOSED TYPE ELECTRIC SWITCH WITH AN INITIAL DELIVERY STATE WITH OPEN CONTACT |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8607522D0 (en) | 1986-04-30 |
| GB2173044B (en) | 1989-01-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) |
Effective date: 19951108 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19980326 |