EP2348523A1 - Explosion-proof key switch. - Google Patents
Explosion-proof key switch. Download PDFInfo
- Publication number
- EP2348523A1 EP2348523A1 EP10826012A EP10826012A EP2348523A1 EP 2348523 A1 EP2348523 A1 EP 2348523A1 EP 10826012 A EP10826012 A EP 10826012A EP 10826012 A EP10826012 A EP 10826012A EP 2348523 A1 EP2348523 A1 EP 2348523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotating shaft
- switch
- switch seat
- explosion
- cover plate
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
- H01H27/06—Key inserted and then turned to effect operation of the switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
- H01H9/042—Explosion-proof cases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/50—Driving mechanisms, i.e. for transmitting driving force to the contacts with indexing or locating means, e.g. indexing by ball and spring
Definitions
- the technical problem to be solved by the invention is to provide an explosion-proof key switch with a simple structure, a low cost, a reliable work and a convenient operation.
- the technical solution of the invention is to provide an explosion-proof key switch including a switch seat and a cover plate, wherein a switch lock core and a rotating shaft connected with each other are provided in the switch seat, an output end of the rotating shaft extends through the cover plate to the outside of the switch seat, a microswitch fit with the output end of the rotating shaft is mounted on the cover plate, characterized in that an input end of the rotating shaft is mounted in the switch seat by a copper jacket sleeved on the rotating shaft, both a clearance between the copper jacket and the rotating shaft and a clearance between the copper jacket and the switch seat have a width less than 0.2mm and a length larger than 12.5mm, a notch is provided on an end surface of the output end of the rotating shaft, an rolling wheel being in contact with a longitudinal cutting surface of the notch is provided at one side of a drive end of an elastic rod mounted on the microswitch, and the other side of the drive end of the elastic rod is in contact with a movable contact.
- the middle portion of the rotating shaft is provided with an annular disc which has a diameter larger than the diameter of the rotating shaft and is formed integrally with the rotating shaft.
- the annular disc is embedded in a space between the switch seat and the cover plate. Two recesses are provided on an end surface of the annular disc.
- a blind hole is correspondingly provided in the switch seat, and a spring and a steel ball are placed in the blind hole.
- a positioning pin being axially symmetrical to the blind hole is mounted in the switch seat.
- An elongate groove fit with the positioning pin is provided in the annular disc, and a maximum rotatable angle of the positioning pin within the elongate groove is the same as an angle between the two recesses with respect to an axis of the annular disc.
- the switch lock core and the rotating shaft are connected together by a protrusion-groove structure.
- the input end of the rotating shaft is mounted in the switch seat by the copper jacket sleeved on the rotating shaft, and the clearances between the copper jacket and the rotating shaft, the switch seat have a width less than 0.2mm and a length larger than 12.5mm, so as to effectively prevent explosive flame of explosive gas mixture from extending to the exterior through clearances between components of the switch.
- the present invention adopts the conventional key switch and the microswitch to achieve the explosion-proof function of the system, which has a simple structure, a convenient operation, a low cost and a convenient maintenance.
- Fig. 1 is a front sectional view of the invention.
- Fig. 2 is a top view of the invention.
- the embodiment has a switch seat 2 and a cover plate 6.
- a switch lock core 1 and a rotating shaft 7 connected with each other are provided in the switch seat 2.
- the switch lock core 1 and the rotating shaft 7 are connected with each other by a protrusion-groove structure, such that the rotating shaft 7 may be rotated together with the switch lock core 1 under the action of the switch lock core 1.
- the output end of the rotating shaft 7 extends through the cover plate 6 to the outside of the switch seat 2.
- a microswitch 9 fit with the output end of the rotating shaft 7 is mounted on the cover plate 6.
- An input end of the rotating shaft 7 is mounted on the switch seat 2 via a copper jacket 5 sleeved on the rotating shaft 7.
- Both a clearance between the copper jacket 5 and the rotating shaft 7 and a clearance between the copper jacket 5 and the switch seat 2 have a width of 0.1mm and a length of 25mm. Since the clearances are very narrow and their length is relatively long (in comparison with the clearance width of 0.1mm), it is possible to effectively prevent explosive flame from extending to the exterior, so as to achieve the explosion-proof effect.
- a notch 14 is provided on the end surface of the output end of the rotating shaft 7.
- a rolling wheel 15 being in contact with the longitudinal cutting surface of the notch 14 is provided at one side of a drive end of an elastic rod 16 mounted on the microswitch 9, and the other side of the drive end of the elastic rod 16 is in contact with a movable contact 17.
- the middle portion of the rotating shaft 7 is provided with an annular disc 10 which has an diameter larger than the diameter of the rotating shaft 7 and is formed integrally with the rotating shaft 7.
- the annular disc is embedded in the space between the switch seat 2 and the cover plate 6, so that the rotating shaft 7 can rotate only around its axis.
- Two recesses 11 are provided on an end surface of the annular disc.
- a blind hole 12 is provided in the switch seat 2, and a spring 3 and a steel ball 4 are placed in the blind hole 12.
- a positioning pin 8 being axially symmetrical to the blind hole 12 is mounted in the switch seat 2.
- An elongate groove 13 fit with the positioning pin 8 is provided in the annular disc 10.
- the maximum rotatable angle of the positioning pin 8 within the elongate groove 13 is the same as an angle between the two recesses 11 with respect to the axis of the annular disc 10.
- the operation principle of the embodiment is as follows.
- the whole switch is installed in an explosion-proof instrument box 18, wherein the switch seat 2 and the explosion-proof instrument box 18 are connected together by screws and the clearance therebetween has a width of 0.1mm and a length of 25mm, which is the same as the requirement of the clearances between the copper jacket 5 and the rotating shaft 7, the switch seat 2 respectively, so as to achieve the explosion-proof effect.
- the steel ball 4 is located in one of the recesses 11, and the positioning pin 8 abuts against one limit end of the elongate groove.
- the key When being operated, the key is inserted into the switch lock core 1 and then is turned to rotate the rotating shaft 7, so that the rolling wheel 15 moves from the notch 14 onto the outer circumferential surface of the rotating shaft 7 and the elastic rod 16 is deformed to come close to the body of the microswitch 9, so as to push the movable contact 17 to actuate, thereby switching the power on.
- the elongate clearances between the copper jacket 5 and the rotating shaft 7, the switch seat 2, and the elongate clearance between the switch seat 2 and the explosion-proof instrument box 18 are used to achieve the explosion-proof of the system.
- the steel ball 4 comes into the other recess 11, which not only achieves a good hand feeling of a driver at the on/off position but also may hold the switch in the position, and the positioning pin 8 abuts against the other limit ends so as to prevent the excessive operation.
- the switch is required to be turned off, the key is rotated in a reverse direction, so that the rotating shaft 7 is rotated in the reverse direction and the rolling wheel 15 moves from the outer circumferential surface of the rotating shaft 7 to the notch 14.
- the elastic rod 16 is returned under the action of its own elastic force, namely moves far away from the body of the microswitch 9, and the movable contact 17 is simultaneously returned under the action of its own elastic force, so that the power is switched off.
Abstract
Description
- The present application claims the benefit of priority to Chinese patent application No.
200920268873.5 - The present invention relates to an explosion-proof key switch, which is mainly applied to explosion-proof vehicles in various explosive gas environments.
- A key switch is an essential electrical element for starting vehicles. However, for various work vehicles containing a mixture of explosive gases, conventional key switches cannot be used at all. Moreover, at present, no true explosion-proof key switch is available commercially. Among present key switches for explosion-proof vehicles, some key switches are operated by the conventional key switch driving a set of lever mechanism to switch on/off self-made contacts, which have complex structures and are bulky and extremely prone to failure; some key switches need several actions to start vehicles, which is inconvenient for operation.
- The technical problem to be solved by the invention is to provide an explosion-proof key switch with a simple structure, a low cost, a reliable work and a convenient operation.
- The technical solution of the invention is to provide an explosion-proof key switch including a switch seat and a cover plate, wherein a switch lock core and a rotating shaft connected with each other are provided in the switch seat, an output end of the rotating shaft extends through the cover plate to the outside of the switch seat, a microswitch fit with the output end of the rotating shaft is mounted on the cover plate, characterized in that an input end of the rotating shaft is mounted in the switch seat by a copper jacket sleeved on the rotating shaft, both a clearance between the copper jacket and the rotating shaft and a clearance between the copper jacket and the switch seat have a width less than 0.2mm and a length larger than 12.5mm, a notch is provided on an end surface of the output end of the rotating shaft, an rolling wheel being in contact with a longitudinal cutting surface of the notch is provided at one side of a drive end of an elastic rod mounted on the microswitch, and the other side of the drive end of the elastic rod is in contact with a movable contact.
- The middle portion of the rotating shaft is provided with an annular disc which has a diameter larger than the diameter of the rotating shaft and is formed integrally with the rotating shaft. The annular disc is embedded in a space between the switch seat and the cover plate. Two recesses are provided on an end surface of the annular disc. A blind hole is correspondingly provided in the switch seat, and a spring and a steel ball are placed in the blind hole.
- A positioning pin being axially symmetrical to the blind hole is mounted in the switch seat. An elongate groove fit with the positioning pin is provided in the annular disc, and a maximum rotatable angle of the positioning pin within the elongate groove is the same as an angle between the two recesses with respect to an axis of the annular disc.
- The switch lock core and the rotating shaft are connected together by a protrusion-groove structure.
- The invention has some advantageous effects. In the invention, the input end of the rotating shaft is mounted in the switch seat by the copper jacket sleeved on the rotating shaft, and the clearances between the copper jacket and the rotating shaft, the switch seat have a width less than 0.2mm and a length larger than 12.5mm, so as to effectively prevent explosive flame of explosive gas mixture from extending to the exterior through clearances between components of the switch. The present invention adopts the conventional key switch and the microswitch to achieve the explosion-proof function of the system, which has a simple structure, a convenient operation, a low cost and a convenient maintenance.
-
Fig. 1 is a front sectional view of the invention; and -
Fig. 2 is a top view of the invention. - As shown in
Figs. 1 and2 , the embodiment has aswitch seat 2 and acover plate 6. Aswitch lock core 1 and a rotatingshaft 7 connected with each other are provided in theswitch seat 2. In this embodiment, the switch lockcore 1 and the rotatingshaft 7 are connected with each other by a protrusion-groove structure, such that therotating shaft 7 may be rotated together with theswitch lock core 1 under the action of theswitch lock core 1. The output end of the rotatingshaft 7 extends through thecover plate 6 to the outside of theswitch seat 2. Amicroswitch 9 fit with the output end of the rotatingshaft 7 is mounted on thecover plate 6. An input end of the rotatingshaft 7 is mounted on theswitch seat 2 via acopper jacket 5 sleeved on the rotatingshaft 7. Both a clearance between thecopper jacket 5 and the rotatingshaft 7 and a clearance between thecopper jacket 5 and theswitch seat 2 have a width of 0.1mm and a length of 25mm. Since the clearances are very narrow and their length is relatively long (in comparison with the clearance width of 0.1mm), it is possible to effectively prevent explosive flame from extending to the exterior, so as to achieve the explosion-proof effect. Anotch 14 is provided on the end surface of the output end of the rotatingshaft 7. Arolling wheel 15 being in contact with the longitudinal cutting surface of thenotch 14 is provided at one side of a drive end of anelastic rod 16 mounted on themicroswitch 9, and the other side of the drive end of theelastic rod 16 is in contact with amovable contact 17. - The middle portion of the rotating
shaft 7 is provided with anannular disc 10 which has an diameter larger than the diameter of the rotatingshaft 7 and is formed integrally with the rotatingshaft 7. The annular disc is embedded in the space between theswitch seat 2 and thecover plate 6, so that therotating shaft 7 can rotate only around its axis. Tworecesses 11 are provided on an end surface of the annular disc. Correspondingly, ablind hole 12 is provided in theswitch seat 2, and aspring 3 and asteel ball 4 are placed in theblind hole 12. When the switch reaches on/off position, thesteel ball 4 enters into one of therecesses 11 under an elastic force of thespring 3, so as to achieve a good hand feeling of a driver at the on/off position. - A
positioning pin 8 being axially symmetrical to theblind hole 12 is mounted in theswitch seat 2. Anelongate groove 13 fit with thepositioning pin 8 is provided in theannular disc 10. The maximum rotatable angle of thepositioning pin 8 within theelongate groove 13 is the same as an angle between the tworecesses 11 with respect to the axis of theannular disc 10. When the switch reaches the on/off position, the positioningpin 8 reaches one of the two limit positions of theelongate groove 13, so as to prevent an excessive operation. - The operation principle of the embodiment is as follows. In practical use, the whole switch is installed in an explosion-
proof instrument box 18, wherein theswitch seat 2 and the explosion-proof instrument box 18 are connected together by screws and the clearance therebetween has a width of 0.1mm and a length of 25mm, which is the same as the requirement of the clearances between thecopper jacket 5 and the rotatingshaft 7, theswitch seat 2 respectively, so as to achieve the explosion-proof effect. When the switch is in the off state, thesteel ball 4 is located in one of therecesses 11, and the positioningpin 8 abuts against one limit end of the elongate groove. When being operated, the key is inserted into theswitch lock core 1 and then is turned to rotate therotating shaft 7, so that therolling wheel 15 moves from thenotch 14 onto the outer circumferential surface of the rotatingshaft 7 and theelastic rod 16 is deformed to come close to the body of themicroswitch 9, so as to push themovable contact 17 to actuate, thereby switching the power on. The elongate clearances between thecopper jacket 5 and the rotatingshaft 7, theswitch seat 2, and the elongate clearance between theswitch seat 2 and the explosion-proof instrument box 18 are used to achieve the explosion-proof of the system. At the same time, thesteel ball 4 comes into theother recess 11, which not only achieves a good hand feeling of a driver at the on/off position but also may hold the switch in the position, and thepositioning pin 8 abuts against the other limit ends so as to prevent the excessive operation. When the switch is required to be turned off, the key is rotated in a reverse direction, so that the rotatingshaft 7 is rotated in the reverse direction and therolling wheel 15 moves from the outer circumferential surface of the rotatingshaft 7 to thenotch 14. Thus, theelastic rod 16 is returned under the action of its own elastic force, namely moves far away from the body of themicroswitch 9, and themovable contact 17 is simultaneously returned under the action of its own elastic force, so that the power is switched off.
Claims (4)
- An explosion-proof key switch comprising a switch seat (2) and a cover plate (6), wherein a switch lock core (1) and a rotating shaft (7) connected with each other are provided in the switch seat (2), an output end of the rotating shaft (7) extends through the cover plate (6) to the outside of the switch seat (2), a microswitch (9) fit with the output end of the rotating shaft (7) is mounted on the cover plate (6), characterized in that an input end of the rotating shaft (7) is mounted in the switch seat (2) by a copper jacket (5) sleeved on the rotating shaft (7), both a clearance between the copper jacket (5) and the rotating shaft (7) and a clearance between the copper jacket (5) and the switch seat (2) have a width less than 0.2mm and a length larger than 12.5mm, a notch (14) is provided on an end surface of the output end of the rotating shaft (7), an rolling wheel (15) being in contact with a longitudinal cutting surface of the notch (14) is provided at one side of a drive end of an elastic rod (16) mounted on the microswitch (9), and the other side of the drive end of the elastic rod (16) is in contact with a movable contact (17).
- The explosion-proof key switch according to claim 1, wherein the middle portion of the rotating shaft (7) is provided with an annular disc (10) which has a diameter larger than the diameter of the rotating shaft (7) and is formed integrally with the rotating shaft (7), the annular disc is embedded in a space between the switch seat (2) and the cover plate (6), two recesses (11) are provided on an end surface of the annular disc, a blind hole (12) is correspondingly provided in the switch seat (2), and a spring (3) and a steel ball (4) are placed in the blind hole.
- The explosion-proof key switch according to claim 2, wherein a positioning pin (8) being axially symmetrical to the blind hole (12) is mounted in the switch seat (2), an elongate groove (13) fit with the positioning pin (8) is provided in the annular disc (10), and a maximum rotatable angle of the positioning pin (8) within the elongate groove (13) is the same as an angle between the two recesses (11) with respect to an axis of the annular disc (10).
- The explosion-proof key switch according to claim 1, 2 or 3, wherein the switch lock core (1) and the rotating shaft (7) are connected with each other by a protrusion-groove structure.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2009202688735U CN201608087U (en) | 2009-10-28 | 2009-10-28 | Anti-explosion key switch |
PCT/CN2010/075971 WO2011050649A1 (en) | 2009-10-28 | 2010-08-13 | Explosion-proof key switch. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2348523A1 true EP2348523A1 (en) | 2011-07-27 |
EP2348523A4 EP2348523A4 (en) | 2013-12-04 |
EP2348523B1 EP2348523B1 (en) | 2014-07-30 |
Family
ID=42952791
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10826012.6A Active EP2348523B1 (en) | 2009-10-28 | 2010-08-13 | Explosion-proof key switch. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2348523B1 (en) |
CN (1) | CN201608087U (en) |
WO (1) | WO2011050649A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103723661B (en) * | 2012-10-10 | 2016-05-04 | 杭叉集团股份有限公司 | The dual-purpose explosion-proof battery fork truck of imflammable gas and dust atmosphere |
CN103663016A (en) * | 2013-12-13 | 2014-03-26 | 江苏吉野电气有限公司 | Novel elevator locking piece |
CN103696630B (en) * | 2013-12-13 | 2016-04-13 | 江苏吉野电气有限公司 | With the novel elevator latch fitting of striking gear |
CN107787146A (en) * | 2017-12-12 | 2018-03-09 | 江苏新力科技实业有限公司 | A kind of mine explosion-suppression and intrinsic safety type control cabinet chamber door |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3723677A (en) * | 1970-01-05 | 1973-03-27 | A Arias | Ignition key alarm |
DE3521155A1 (en) * | 1985-06-13 | 1986-12-18 | Brown, Boveri & Cie Ag, 6800 Mannheim | Operating element for an explosion-proof switch |
DE9203143U1 (en) * | 1992-03-10 | 1992-06-17 | Baer Elektrowerke Gmbh & Co Kg, 5885 Schalksmuehle, De | |
CN201298487Y (en) * | 2008-10-27 | 2009-08-26 | 常州澳丰机电制造有限公司 | Mineral intrinsic safe key switch |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2427882Y (en) * | 2000-04-26 | 2001-04-25 | 光阳工业股份有限公司 | Lock for motor cycle main switch |
CN101699602B (en) * | 2009-10-28 | 2011-11-30 | 杭叉集团股份有限公司 | Explosion-proof key switch |
-
2009
- 2009-10-28 CN CN2009202688735U patent/CN201608087U/en not_active Expired - Lifetime
-
2010
- 2010-08-13 EP EP10826012.6A patent/EP2348523B1/en active Active
- 2010-08-13 WO PCT/CN2010/075971 patent/WO2011050649A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3723677A (en) * | 1970-01-05 | 1973-03-27 | A Arias | Ignition key alarm |
DE3521155A1 (en) * | 1985-06-13 | 1986-12-18 | Brown, Boveri & Cie Ag, 6800 Mannheim | Operating element for an explosion-proof switch |
DE9203143U1 (en) * | 1992-03-10 | 1992-06-17 | Baer Elektrowerke Gmbh & Co Kg, 5885 Schalksmuehle, De | |
CN201298487Y (en) * | 2008-10-27 | 2009-08-26 | 常州澳丰机电制造有限公司 | Mineral intrinsic safe key switch |
Non-Patent Citations (1)
Title |
---|
See also references of WO2011050649A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN201608087U (en) | 2010-10-13 |
WO2011050649A1 (en) | 2011-05-05 |
EP2348523B1 (en) | 2014-07-30 |
EP2348523A4 (en) | 2013-12-04 |
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