DK178545B1 - Magnetisk aktiverbart sikkerhedsafbryderarrangement - Google Patents

Magnetisk aktiverbart sikkerhedsafbryderarrangement Download PDF

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Publication number
DK178545B1
DK178545B1 DKPA201470744A DKPA201470744A DK178545B1 DK 178545 B1 DK178545 B1 DK 178545B1 DK PA201470744 A DKPA201470744 A DK PA201470744A DK PA201470744 A DKPA201470744 A DK PA201470744A DK 178545 B1 DK178545 B1 DK 178545B1
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DK
Denmark
Prior art keywords
safety switch
switch
permanent magnet
enclosure
internal permanent
Prior art date
Application number
DKPA201470744A
Other languages
Danish (da)
Inventor
Morten Højbjerre
Jesper Holmegaard Olsen
Original Assignee
As Wodschow & Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by As Wodschow & Co filed Critical As Wodschow & Co
Priority to DKPA201470744A priority Critical patent/DK178545B1/en
Priority to PCT/EP2015/077638 priority patent/WO2016083449A1/en
Publication of DK201470744A1 publication Critical patent/DK201470744A1/en
Application granted granted Critical
Publication of DK178545B1 publication Critical patent/DK178545B1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0073—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding actuated by relative movement between two magnets
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
    • A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
    • F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
    • F16P3/145—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using magnetic technology
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/008—Change of magnetic field wherein the magnet and switch are fixed, e.g. by shielding or relative movements of armature

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

The present invention relates to a magnetically activatable safety switch arrangement including an enclosure and an electric power safety switch ar- ranged inside the enclosure, wherein the electric power safety switch includes a switch housing with a set of contacts and an activation element, wherein the electric power safety switch is operable from a passive state to an activated state by displacing the activation element from a rest position to an activated position, wherein the activation element is biased towards its rest position, and wherein a first internal permanent magnet is arranged displaceably in the enclosure in order to displace the activation element of the electric power safety switch between its rest position and its activated position by interaction with an external magnet arranged outside the enclosure. A second internal permanent magnet is arranged inside the enclosure so that the switch housing of the electric power safety switch is arranged between the first internal permanent magnet and the second internal permanent magnet, in that the first and second internal permanent magnets are oriented so that they attract each other in order for the first internal permanent magnet to maintain the activation element of the electric power safety switch in its acti vated position as long as there is no interaction between the first internal permanent magnet and an external magnet, in that, in the passive state of the electric power safety switch, the set of contacts is in a closed state, and in that, in the activated state of the electric power safety switch, the set of contacts is in an open state.

Description

Magnetically activatable safety switch arrangement
The present invention relates to a magnetically activatable safety switch arrangement including an enclosure and an electric power safety switch arranged inside the enclosure, wherein the electric power safety switch includes a switch housing with a set of contacts and an activation element, wherein the electric power safety switch is operable from a passive state to an activated state by displacing the activation element from a rest position to an activated position, wherein the activation element is biased towards its rest position, and wherein a first internal permanent magnet is arranged dis-placeably in the enclosure in order to displace the activation element of the electric power safety switch between its rest position and its activated position by interaction with an external magnet arranged outside the enclosure.
GB 2 206 240 discloses a magnetically operated electrical switch comprising a microswitch mounted in a first chamber of a casing. A first magnet is located adjacent the actuating member of the microswitch and may be urged against the actuating member by magnetic repulsion when a second magnet is moved into proximity therewith by movement of a sliding plunger. The microswitch is mounted in a holder including springs for biasing the first magnet to its non-actuating position, or bias is provided by the microswitch mechanism. The second magnet can be biased by magnetic repulsion alone and can be mounted in its own housing. The seal housing may be sealed to the environment. The switch is suitable for installation in bulkheads or the like to serve as a control switch in hostile environments since there is no mechanical linkage between the plunger and microswitch. However, this magnetically operated switch is not suitable as a safety switch for preventing unauthorised operation of for instance a processing apparatus when a high degree of safety is demanded, as the actuation of the microswitch is either depending on a relativly large actuation pressure in order to move the sliding plunger or on the internal bias in the microswitch in order to return the actuating member of the microswitch to its resting position.
CN 202977306 U discloses a magnetically-actuated microswitch comprising a magnetically-actuated microswitch body, wherein the magnetically-actuated microswitch body is provided with a switch button. A magnet pushing device is arranged on the switch button. According to the utility model, by using the magnetically-actuated microswitch, no holes or windows are required on the surface of the product, so that the surface of the product is easy to clean, and water penetration is prevented, thereby ensuring the use safety of the product. However, this magnetically operated switch is not suitable as a safety switch for preventing unauthorised operation of for instance a processing apparatus when a high degree of safety is demanded, as the actuation of the microswitch is either depending on a suitably large actuation pressure in order to move the magnet pushing device or on the internal bias in the micro-switch in order to return the switch button of the microswitch to its resting position.
US patent 5,877,664 describes another magnetically activatable switch operable from a passive state to an activated state by displacing an activation element using an external magnet.
The object of the present invention is to provide a magnetically activatable safety switch arrangement providing a high degree of safety.
Summary
In view of this object, a second internal permanent magnet is arranged inside the enclosure so that the switch housing of the electric power safety switch is arranged between the first internal permanent magnet and the second internal permanent magnet, in that the first and second internal permanent mag nets are oriented so that they attract each other in order for the first internal permanent magnet to maintain the activation element of the electric power safety switch in its activated position as long as there is no interaction between the first internal permanent magnet and an external magnet, in that, in the passive state of the electric power safety switch, the set of contacts is in a closed state, in that, in the activated state of the electric power safety switch, the set of contacts is in an open state, and in that the electric power safety switch has the form of a first and a second standardised miniature snap-action switch wherein the activation element has the form of a spring-biased actuator button protruding from the switch housing, the first and the second standardised miniature snap-action switches are arranged next to each other, preferably close to each other, stacked or in mutual abutment, so that their spring-biased actuator buttons are activatable simultaneously by abutment of the first internal permanent magnet, and the set of contacts of the first standardised miniature snap-action switch is connected in series with the set of contacts of the second standardised miniature snap-action switch.
In this way, with suitably strong first and second internal permanent magnets, it may with a high degree of safety be ensured that the set of contacts is forced to the open state by means of magnetic attraction between the first and second internal permanent magnets as long as no external magnet is within a certain distance of the first internal permanent magnet. Thereby, unauthorised operation of for instance a processing apparatus may be ensured with a high degree of safety, as the power supply to the motor may be cut directly or not by the set of contacts being in the open state as long as a certain machine part or element provided with an external magnet is not in its proper position. At the same time an even greater safety may be provided, as failure of one of the standardised miniature snap-action switches will not influence the operation of the magnetically activatable safety switch arrangement, as long as the other switch operates correctly.
In an embodiment, the second internal permanent magnet is fixed inside the enclosure and preferably abuts the switch housing of the electric power safety switch. Thereby, the set of contacts may be forced to the open state by means of magnetic attraction between the first and second internal permanent magnets in an even more reliable, fast and secure way.
In a structurally particularly advantageous embodiment, the electric power safety switch is a standardised miniature snap-action switch wherein the activation element has the form of a spring-biased actuator button protruding from the switch housing.
Preferably, the electric power safety switch is of the type providing forced opening of the set of contacts when a spring-biased actuator button protruding from the switch housing is pressed into the switch housing. Preferably, the electric power safety switch is of the microswitch type.
In an embodiment the electric power safety switch is a normally-closed switch. A normally-closed or NC switch, breaks contact when the spring-biased actuator button is pressed and makes contact when it is released.
In an embodiment, the first and second internal permanent magnets have the form of cylindrical magnets arranged so that or substantially so that their cylinder axes run through the spring-biased actuator button. Thereby, the first internal permanent magnet may press on the spring-biased actuator button with its central part and be in a well-balanced orientation, thereby being able to slide smoothly in a section of an enclosure having a cylindrical cavity or bore.
In a structurally particularly advantageous embodiment, the first internal permanent magnet is guided displaceably inside a section of the enclosure having a cylindrical cavity, the cylindrical cavity has a first end open to the switch housing of the electric power safety switch or closed by a first end cap opposing the switch housing, and the cylindrical cavity has a second end closed by a second end cap.
Preferably, the second end cap is made from a resilient material, such as silicone. Thereby, a smoother operation of the magnetically activatable safety switch arrangement may be ensured.
In an embodiment, the first internal permanent magnet is guided displaceably inside a section of the enclosure having a cylindrical cavity, wherein the cylindrical cavity has a first end open to the switch housing of the electric power safety switch or closed by a first end cap opposing the switch housing or somewhat closed by the enclosure so that at least the activation element can extend into the cylindrical cavity, and the cylindrical cavity has a second end closed by the enclosure.
In an embodiment the external magnet is positioned in a certain distance from the first internal permanent magnet so that the force of attraction between the external magnet and the first internal permanent magnet becomes stronger than the force of attraction between the first and second internal permanent magnets.
The first and second internal permanent magnet as well as the external magnet may all have the same attraction force or the first and second internal permanent magnet as well as the external magnet may each have an attraction force different from one or two of the other two magnets so that the distance between the external magnet and the first internal permanent magnet and/or between the first and second internal permanent magnet can be varied.
The present invention further relates to a processing machine, such as a kneading or mixing machine, having a machine housing including a magnetically activatable safety switch arrangement as described above, wherein the processing machine is adapted to carry a processing tool, such as a kneading or mixing tool, driven by a motor, wherein the processing machine includes a safety shield adapted to at least partly shield the processing tool in relation to a user when the safety shield is in a shielding position in relation to the processing tool, the safety shield being arranged displaceably away from its shielding position in order to allow access to the processing tool, wherein the motor is powered directly or not, through the set of contacts of the electric power safety switch, and wherein the external magnet is arranged in the safety shield.
In an embodiment, the processing machine is provided with four magnetically activatable safety switch arrangements, wherein the safety shield has a ring-formed contact element adapted to abut a first stationary surface of the machine housing of the processing machine, said surface extending at least substantially about a rotational axis of the processing tool, wherein the safety shield is composed by two separate shield sections each including a respective part of the ring-formed contact element, so that each of the shield sections may be mounted before the other shield section is mounted, wherein each respective part of the ring-formed contact element pertaining to a respective shield section is provided with two spaced apart external magnets each adapted for interaction with a respective first internal permanent magnet pertaining to a respective one of the four magnetically activatable safety switch arrangements. Thereby, it may be ensured that the motor of the processing machine is stopped even if a user tilts only one of the shield sections slightly, as at least one of the four magnetically activatable safety switch arrangements may be activated. It is noted that the arrangement of four magnetically activatable safety switch arrangements as described above is a separate invention and that the function and inventive idea of this invention is independent of the type of the magnetically activatable safety switch arrangements used. That means that the magnetically activatable safety switch arrangements used in said separate invention may be of a different type than that described above. Said separate invention may in particular be protected by means of a divisional patent application.
The present invention further relates to a processing machine, such as a kneading or mixing machine, having a machine housing including a magnetically activatable safety switch arrangement as described above, wherein the processing machine is adapted to carry a processing tool, such as a kneading or mixing tool, driven by a motor, wherein the processing machine includes a bowl retainer adapted to fixate a bowl to the processing machine, the bowl retainer being displaceable between a lower position and an upper position, the bowl when fixated to the bowl retainer being adapted to at least partly shield the processing tool in relation to a user when the bowl retainer is in the upper position in relation to the processing tool, wherein the motor is powered through the set of contacts of the electric power safety switch, and wherein the external magnet is arranged in the bowl. Thereby, it may be ensured that the motor of the processing machine is stopped if the bowl retainer is moved towards the lower position or if the bowl is loosened from the bawl retainer.
In another aspect of the invention a magnetically activatable safety switch arrangement includes an enclosure comprising a switch housing cavity wherein an electric power safety switch can be arranged, a first internal permanent magnet arranged displaceably in the enclosure adjacent to the switch housing cavity and a second internal permanent magnet arranged inside the enclosure oriented so that the first and second internal permanent magnets attract each other and so that the first internal permanent magnet is displaced toward the switch housing cavity.
In this aspect of the invention the electric power safety switch comprises an activation element which is maintain in its activated position by the first internal permanent magnet due to the attraction force between the first and second internal permanent magnets when the electric power safety switch is arranged in the switch housing cavity in the enclosure. This as the electric power safety switch further includes a switch housing with a set of contacts and the activation element, wherein the electric power safety switch is operable from a passive state to an activated state by displacing the activation element from a rest position to an activated position, wherein the activation element is biased towards its rest position, wherein in the passive state of the electric power safety switch, the set of contacts is in a closed state, and in that, in the activated state of the electric power safety switch, the set of contacts is in an open state.
Brief description of the drawings
Fig. 1A is a cross-sectional view through a first embodiment of a magnetically activatable safety switch arrangement, where the electric power safety switch is in an active and open state.
Fig. 1B is a cross-sectional view through the first embodiment of Fig. 1A of a magnetically activatable safety switch arrangement, where the electric power safety switch is in a passive and closed state.
Fig. 2A is a cross-sectional view through a second embodiment of a magnetically activatable safety switch arrangement, where the electric power safety switch is in an active and open state.
Fig. 2B is a cross-sectional view through the second embodiment of Fig. 2A of a magnetically activatable safety switch arrangement, where the electric power safety switch is in a passive and closed state.
Fig. 3 shows a first implementation of a set of magnetically activatable safety switch arrangements in a processing machine in connection with shield detection.
Fig. 4 shows a second implementation of a set of magnetically activatable safety switch arrangements in a processing machine in connection with bowl detection.
Detailed description
The invention will now be explained in more detail below by means of examples of embodiments with reference to the schematic drawings, in which Fig. 1A shows a first embodiment of a magnetically activatable safety switch arrangement 1 including an enclosure 2 and an electric power safety switch 3 arranged at least partially inside the enclosure 2. The enclosure 2 may be manufactured as one part and may, or may not, be totally enclosed. The enclosure 2 may be made from any material. The material may be suitable for moulding. The material may preferably be a non-magnetic material such as Acrylonitrile butadiene styrene (ABS) and Polyoxymethylene (POM). The electric power safety switch 3 includes a switch housing 4 with a set of contacts (not shown) and an activation element 5 such as a spring-biased actuator button 5 (see Fig. 1B) and is operable from a passive state to an activated state by displacing the activation element 5 from a rest position to an active position. When no activation force from the first internal permanent magnet 6 influences the activation element 5, the activation element 5 is biased towards its rest position as shown in Fig. 1B. The activation force may be any force suitable for activating the activation element 5. A first internal permanent magnet 6 and a second internal permanent magnet 7 are likewise arranged inside the enclosure 2 on each side of the electric power safety switch 3. The first internal permanent magnet 6 is arranged in a section of the enclosure 2 having a cavity 9 or bore allowing the first internal permanent magnet 6 to move from one end of the cavity 9 to the other end of the cavity 9. Said section of the enclosure 2 may be formed as a cylindrical part of the enclosure 2.
The cavity 9 has a first end 10 open to the switch housing 4 of the electric power safety switch 3, closed by a first end cap (not shown) opposing the switch housing 4 or somewhat closed by the enclosure 2 so that at least the activation element 5 can extend into the cavity 9, and the cavity 9 has a second end 11 closed by a second end cap 12. The second end cap 12 is preferably made from a resilient material, such as silicone. One or both of the first and second internal permanent magnets 6, 7 may be shaped like a cylinder. If the first internal permanent magnet 6 is cylindrical, the shape of the cavity 9 may likewise be cylindrical so that the first internal permanent magnet 6 is displaceably guided in the cavity 9. The activation element 5 on the electric power safety switch 3 extends through the first end 10 of the cavity 9 and through a potential first end cap (not shown) into the cavity 9. The cavity 9 may also be frustoconical from the first end 10 to the second end 11.
The first and second internal permanent magnets 6, 7 are oriented so that they attract each other and so that they displace the activation element 5 into an active and open position. Fig. 1A thereby shows the electric power safety switch 3 in an active state.
Fig. 1B shows the first embodiment of the magnetically activatable safety switch arrangement 1, where the electric power safety switch 3 is in a passive state. This is obtained by positioning an external magnet 8 a certain distance from the first internal permanent magnet 6 so that the force of attraction between the external magnet 8 and the first internal permanent magnet 6 becomes stronger than the force of attraction between the first and second internal permanent magnets 6, 7. The first internal permanent magnet 6 is hereby displaced within the cavity 9 towards the external magnet 8 and reloads the activation element 5. As no activation force influences the activation element 5, the activation element 5 is biased towards its rest position.
Fig. 2A shows a second embodiment of a magnetically activatable safety switch arrangement 1 including an enclosure 2 and two electric power safety switches 3 arranged at least partially inside the enclosure 2. The enclosure 2 may be composed by two separate parts which can be assembled by means of fastening means such as threated means, e.g. screws, or snap-fit connections or they may be glued together etc. The enclosure 2 may, or may not, be totally enclosed. The enclosure 2 may be made from any material. The material may be suitable for moulding. The material may preferably be a nonmagnetic material such as Acrylonitrile butadiene styrene (ABS) and Polyox-ymethylene (POM). Each electric power safety switch 3 includes a switch housing 4 with a set of contacts (not shown) and an activation element 5 such as a spring-biased actuator 5 (see Fig. 2B) and is operable from a passive state to an activated state by displacing the activation element 5 from a rest position to an active position. When no activation force from the first internal permanent magnet 6 influences the activation element 5, the activation element 5 is biased towards its rest position as shown in Fig. 2B. The activation force may be any force suitable for activating the activation element 5. The two electrical power safety switches 3 are preferably placed next to each other so that the two activation elements 5 are closed to each other. A first internal permanent magnet 6 and a second internal permanent magnet 7 are likewise arranged inside the enclosure 2 on each side of the electric power safety switches 3. The first internal permanent magnet 6 is arranged in a section of the enclosure 2 having a cavity 9 or bore allowing the first internal permanent magnet 6 to move from one end of the cavity 9 to the other end of the cavity 9.
The cavity 9 has a first end 10 open to the switch housing 4 of the electric power safety switch 3, closed by a first end cap (not shown) opposing the switch housing 4 or somewhat closed by the enclosure 2 so that at least the activation element 5 can extend into the cavity 9. One or both of the first and second internal permanent magnets 6, 7 may be shaped like a cylinder. If the first internal permanent magnet 6 is cylindrical, the shape of the cavity 9 may likewise be cylindrical so that the first internal permanent magnet 6 is dis-placeably guided in the cavity 9. The activation element 5 on the electric power safety switch 3 extends through the first end 10 of the cavity 9 and through a potential first end cap (not shown) into the cavity 9.
The first and second internal permanent magnets 6, 7 are oriented so that they attract each other and so that they displace both activation elements 5 into an active and open position. Fig. 2A thereby shows the electric power safety switch 3 in an active state.
Fig. 3 shows a first implementation of a set of magnetically activatable safety switch arrangements 1 in a processing machine 100 in connection with shield detection. The processing machine 100 may be a kneading or mixing machine having a machine housing 101 adapted to carry a processing tool (not shown), such as a kneading or mixing tool driven by a motor (not shown). The machine housing 101 also have a first stationary surface 104 adapted to carry a safety shield 102. The first stationary surface 104 may be approximately horizontal. The safety shield 102 includes a ring-formed contact element 103 which is configured for being mounted on the first stationary surface 104.
Preferably four magnetically activatable safety switch arrangements 1 as described above may be included in the machine housing 101 close to the first stationary surface 104 and positioned so that the first internal permanent magnet 6 (see Fig. 1A-B and 2A-B) is closer to the first stationary surface 104 than the second internal permanent magnet 7 (see Fig. 1A-B and 2A-B).
The ring-formed contact element 103 on the safety shield 102 is provided with four spaced apart external magnets 8 (see Fig. 1A-B and 2A-B) each adapted for interaction with a respective first internal permanent magnet 6 (see Fig. 1A-B and 2A-B) pertaining to a respective one of the four magnetically activatable safety switch arrangements 1 included in the machine housing 101.
The motorfor running the processing tools is powered directly or not through a set of contacts of the electric power safety switches 3 (see Fig. 1A-B and 2A-B) in the four magnetically activatable safety switch arrangements 1 when all the electric power safety switches 3 is in a passive state. All the electric power safety switches 3 is in a passive state when the ring-formed contact element 103 on the safety shield 102 is correctly mounted to the first stationary surface 104 on the machine housing 101.
The safety shield 102 may be composed by two separate shield sections 105 each including a respective part of the ring-formed contact element 103, wherein each respective part of the ring-formed contact element 103 pertaining to a respective shield section 105 is provided with two spaced apart external magnets each adapted for interaction with a respective first internal permanent magnet 6 (see Fig. 1A-B and 2A-B) pertaining to a respective one of the four magnetically activatable safety switch arrangements 1.
Fig. 4 shows a second implementation of a set of magnetically activatable safety switch arrangements 1 in a processing machine 100 in connection with bowl detection. The processing machine 100 may be a kneading or mixing machine having a machine housing 101 adapted to carry a processing tool (not shown), such as a kneading or mixing tool driven by a motor (not shown). The machine housing 101 also includes a bowl retainer 107 which is attached to the interior of the machine housing 101 through a second stationary surface 108 on the machine housing 101 and adapted to fixate and carry a bowl 106. The second stationary surface 108 may be approximately vertical. The bowl retainer 107 can be displaced vertically between an upper position and a lower position by means of a handle 109.
A magnetically activatable safety switch arrangements 1 as described above is included in the machine housing 101 close to the second stationary surface 108 of the machine housing 101 and positioned so that the first internal permanent magnet 6 is closer to the second stationary surface 108 than the second internal permanent magnet 7.
The bowl 106 is provided with an external magnet 8 adapted for interaction with the respective first internal permanent magnet 6 (see Fig. 1A-B and 2A-B) pertaining the respective magnetically activatable safety switch arrangement 1 included in the machine housing 101. The bowl retainer 107 may comprise a guiding means 110 such as a hole in order to guide the placement of the bowl 106 so that the interaction between the external magnet 8 and the first permanent magnet 6 in the magnetically activatable safety switch arrangement 1 is optimal. The motor for running the processing tools is powered through a set of contacts of the electric power safety switches 3 (see Fig. 1A-B and 2A-B) in the magnetically activatable safety switch arrangement 1 when the electric power safety switch 3 is in a passive state. The electric power safety switch 3 is in a passive state when the bowl 106 is correctly placed and fixated in the bowl retainer 107 and when the bowl retainer 107 is in the upper position.

Claims (10)

1. Magnetisk aktiverbart sikkerhedsafbryderarrangement (1) indbefattende en indeslutning (2) og en sikkerhedsafbryder (3) for elektrisk strøm anbragt inde i indeslutningen (2), hvor sikkerhedsafbryderen (3) for elektrisk strøm indbefatter et afbryderhus (4) med et sæt af kontakter og et aktiveringselement (5), hvor sikkerhedsafbryderen (3) for elektrisk strøm kan betjenes fra en passiv tilstand til en aktiveret tilstand ved forskydning af aktiveringselementet (5) fra en hvileposition til en aktiveret position, hvor aktiveringselementet (5) er forspændt i retning mod sin hvileposition, og hvor en første indvendig, permanent magnet (6) er anbragt forskydeligt i indeslutningen med henblik på at forskyde aktiveringselementet (5) af sikkerhedsafbryderen (3) for elektrisk strøm mellem sin hvileposition og sin aktiverede position eller ved interaktion med en udvendig magnet (8) anbragt uden for indeslutningen, hvor en anden indvendig, permanent magnet (7) er anbragt inde i indeslutningen (2), således at afbryderhuset (4) af sikkerhedsafbryderen (3) for elektrisk strøm er anbragt mellem den første indvendige, permanente magnet (6) og den anden indvendige, permanente magnet (7), idet den første og den anden indvendige, permanente magnet (6, 7) er orienteret således, at de tiltrækker hinanden, så den første indvendige, permanente magnet (6) kan holde aktiveringselementet (5) af sikkerhedsafbryderen (3) for elektrisk strøm i sin aktiverede position, så længe at der ikke er nogen interaktion mellem den første indvendige, permanente magnet (6) og en udvendig magnet (8), idet sættet af kontakter, i den passive tilstand af sikkerhedsafbryderen (3) for elektrisk strøm, er i en lukket tilstand, og idet sættet af kontakter, i den aktiverede tilstand af sikkerhedsafbryderen (3) for elektrisk strøm, er i en åben tilstand, kendetegnet ved, at sikkerhedsafbryderen (3) for elektrisk strøm har form som en første og en anden standardiseret miniature snap-afbryder, hvor aktiveringselementet (5) har form som en fjederforspændt aktuator-knap, der udrager fra afbryderhuset (4), hvor den første og den anden standardiserede miniature snap-afbryder er anbragt ved siden af hinanden, fortrinsvis tæt ved hinanden eller i indbyrdes anlæg, således at deres fjeder-forspændte aktua-torknapper kan aktiveres samtidigt ved anlæg af den første indvendige, permanente magnet (6), og hvor sættet af kontakter af den første standardisere de snap-kontakt er serieforbundet med sættet af kontakter af den anden standardiserede miniature snap-afbryder.A magnetically actuable safety switch arrangement (1) including an enclosure (2) and an electric current safety switch (3) disposed within the enclosure (2), wherein the electrical power safety switch (3) includes a switch housing (4) with a set of contacts and an actuating element (5) wherein the electric current safety switch (3) can be operated from a passive state to an activated state by shifting the actuating element (5) from a resting position to an activated position, wherein the actuating element (5) is biased towards its resting position, and wherein a first internal permanent magnet (6) is slidably disposed within the enclosure to displace the actuating element (5) of the electrical switch (3) for electrical current between its resting position and its activated position or by interaction with an external magnet (8) located outside the enclosure, wherein another internal permanent magnet (7) is disposed within the enclosure; gene (2) so that the electrical housing safety switch (3) switch (4) is disposed between the first internal permanent magnet (6) and the second internal permanent magnet (7), the first and second internal, permanent magnet (6, 7) is oriented so as to attract each other so that the first internal permanent magnet (6) can hold the actuating element (5) of the electric current safety switch (3) in its activated position so long as there is no is any interaction between the first internal permanent magnet (6) and an external magnet (8), the set of contacts, in the passive state of the safety switch (3) for electric current, being in a closed state and the set of contacts , in the activated state of the electric current safety switch (3), is in an open state, characterized in that the electric current safety switch (3) is in the form of a first and second standardized miniature snap switch, wherein the actuating element (5) is in the form of a spring-biased actuator button extending from the switch housing (4), wherein the first and second standard miniature snap switches are arranged side by side, preferably close to one another or in mutual arrangement, thus that their spring-biased actuator buttons can be actuated simultaneously by the installation of the first internal permanent magnet (6) and wherein the set of contacts of the first standardize the snap contact is connected in series with the set of contacts of the second standardized miniature snap switch. circuit breaker. 2. Magnetisk aktiverbart sikkerhedsafbryderarrangement ifølge krav 1, hvor den anden indvendige, permanente magnet (7) er fast anbragt inde i indeslutningen (2) og fortrinsvis ligger an mod afbryderhuset (4) af sikkerhedsafbryderen (3) for elektrisk strøm.The magnetically activatable safety switch arrangement according to claim 1, wherein the second internal permanent magnet (7) is fixedly located inside the enclosure (2) and preferably abuts against the switch housing (4) of the electrical current safety switch (3). 3. Magnetisk aktiverbart sikkerhedsafbryderarrangement ifølge et eller flere af et hvilket som helst af de foregående krav, hvor sikkerhedsafbryderen (3) for elektrisk strøm er en normalt-lukket afbryder.A magnetically actuable safety switch arrangement according to one or more of the preceding claims, wherein the safety switch (3) for electric current is a normally closed circuit breaker. 4. Magnetisk aktiverbart sikkerhedsafbryderarrangement ifølge et eller flere af et hvilket som helst af de foregående krav, hvor den første og den anden indvendige, permanente magnet (6, 7) har form som cylindriske magneter anbragt således, eller i det væsentlige således, at deres cylinderakser forløber gennem den fjeder-forspændte aktuator-knap.A magnetically activatable safety switch arrangement according to one or more of the preceding claims, wherein the first and second inner permanent magnet (6, 7) are in the form of cylindrical magnets disposed so, or substantially so that their cylinder axes extend through the spring-biased actuator button. 5. Magnetisk aktiverbart sikkerhedsafbryderarrangement ifølge et eller flere af et hvilket som helst af de foregående krav, hvor den første indvendige, permanente magnet (6) styres forskydeligt inde i en sektion af indeslutningen (2), der har en cylindrisk kavitet (9) eller udboring, hvor den cylindriske kavitet (9) har en første ende (10), der er åben mod afbryderhuset (4) af sikkerhedsafbryderen (3) for elektrisk strøm eller lukket med en første endehætte modsat afbryderhuset (4) eller i en vis grad lukket af indeslutningen (2), således at i det mindste aktiveringselementet (5) kan strække sig ind i den cylindriske kavitet (9), og den cylindriske kavitet (9) har en anden ende (11), der er lukket af en anden endehætte (12), og hvor den anden endehætte (12) fortrinsvis er lavet af et eftergiveligt materiale, såsom silicone.A magnetically activatable safety switch arrangement according to one or more of the preceding claims, wherein the first internal permanent magnet (6) is slidably guided within a section of the enclosure (2) having a cylindrical cavity (9) or bore, wherein the cylindrical cavity (9) has a first end (10) open to the switch housing (4) of the electrical power switch (3) or closed with a first end cap opposite the switch housing (4) or to some extent closed of the enclosure (2) so that at least the actuating element (5) can extend into the cylindrical cavity (9) and the cylindrical cavity (9) has a second end (11) closed by a second end cap ( 12) and wherein the second end cap (12) is preferably made of a resilient material such as silicone. 6. Magnetisk aktiverbart sikkerhedsafbryderarrangement ifølge et eller flere af et hvilket som helst af de foregående krav, hvor den første indvendige, permanente magnet (6) styres forskydeligt inde i en sektion af indeslutningen (2), der har en cylindrisk kavitet (9), hvor den cylindriske kavitet (9) har en første ende (10), der er åben mod afbryderhuset (4) af sikkerhedsafbryderen (3) for elektrisk strøm eller lukket med en første endehætte modsat afbryderhuset (4) eller i en vis grad lukket af indeslutningen (2), således at i det mindste aktiveringselementet (5) kan strække sig ind i den cylindriske kavitet (9), og den cylindriske kavitet (9) har en anden ende (11), der er lukket af indeslutningen (2).A magnetically activatable safety switch arrangement according to one or more of the preceding claims, wherein the first inner permanent magnet (6) is slidably guided within a section of the enclosure (2) having a cylindrical cavity (9), wherein the cylindrical cavity (9) has a first end (10) open to the switch body (4) of the electrical power switch (3) or closed with a first end cap opposite the switch body (4) or to some extent closed by the enclosure (2) so that at least the actuating element (5) can extend into the cylindrical cavity (9) and the cylindrical cavity (9) has another end (11) closed by the enclosure (2). 7. Magnetisk aktiverbart sikkerhedsafbryderarrangement ifølge et eller flere af et hvilket som helst af de foregående krav, hvor den udvendige magnet (8) er anbragt i en vis afstand fra den første indvendige, permanente magnet (6), således at tiltrækningskraften mellem den udvendige magnet (8) og den første indvendige magnet (6) bliver stærkere end tiltrækningskraften mellem den første og den anden indvendige, permanente magnet (6, 7).Magnetically activatable safety switch arrangement according to one or more of the preceding claims, wherein the outer magnet (8) is located at a certain distance from the first inner permanent magnet (6), so that the force of attraction between the outer magnet (8) and the first inner magnet (6) become stronger than the force of attraction between the first and the second inner permanent magnet (6, 7). 8. Bearbejdningsapparat (100), såsom en ælte- eller blandemaskine, med et maskinhus (101) indbefattende et magnetisk aktiverbart sikkerhedsafbryderarrangement (1) ifølge et eller flere af et hvilket som helst af de foregående krav, hvor bearbejdningsapparatet (100) er indrettet til at have isat et bearbejdningsredskab, såsom et ælte- eller blanderedskab, drevet af en motor, hvor bearbejdningsapparatet (100) indbefatter en sikkerhedsafskærmning (102) indrettet til at i det mindste delvist at afskærme bearbejdningsredskabet i forhold til en bruger, når sikkerhedsafskærmningen (102) er i en afskærmningsposition i forhold til bearbejdningsredskabet, idet sikkerhedsafskærmningen (102) er indrettet forskydeligt bort fra sin afskærmningsposition med henblik på at tillade adgang til bearbejdningsværktøjet, hvor motoren er kraftforsynet gennem sættet af kontakter på sikkerhedsafbryderen (3) for elektrisk strøm, og hvor den udvendige magnet (8) er anbragt i sikkerhedsafskærmningen (102).A processing apparatus (100), such as a kneading or mixing machine, with a machine housing (101) including a magnetically actuable safety switch arrangement (1) according to one or more of the preceding claims, wherein the processing apparatus (100) is adapted to having inserted a machining tool, such as a kneading or mixing tool, powered by a motor, wherein the machining apparatus (100) includes a safety shield (102) adapted to at least partially shield the machining tool relative to a user when the safety shield (102) is in a shielding position relative to the machining tool, the safety shield (102) being displaceably disposed away from its shielding position to allow access to the machining tool where the motor is powered through the set of contacts on the safety current switch (3) and outer magnet (8) is arranged in safety shield none (102). 9. Bearbejdningsapparat ifølge krav 8 tilvejebragt med fire magnetisk aktiverbare sikkerhedsafbryderarrangementer (1) ifølge et eller flere af kravene 1 til 7, hvor sikkerhedsafskærmningen (102) har et ringformet kontaktelement (103) indrettet til at ligge an mod en første stationær overflade (104) af maskinhuset (101) af bearbejdningsapparatet (100), hvilken overflade udstrækker sig i det mindste delvist omkring en rotationsakse af bearbejdningsredskabet, hvor sikkerhedsafskærmningen (102) er sammensat af to separate afskærmningssektioner (105), der hver især indbefatter en respektiv del af det ringformede kontaktelement (103), således at hver af afskærmningssektionerne (105) kan blive monteret, inden den anden afskærmningssektion (105) bliver monteret, hvor hver respektiv del af det ringformede kontaktelement (103), der vedrører en respektiv afskærmningssektion (105), er tilvejebragt med to i afstand fra hinanden anbragte, udvendige magneter, der hver er indrettet til interaktion med en respektiv første indvendig, permanent magnet (6), der vedrører en respektiv én af de fire magnetisk aktiverbare sikkerhedsafbryderarrangementer (1).Processing apparatus according to claim 8 provided with four magnetically activatable safety switch arrangements (1) according to one or more of claims 1 to 7, wherein the safety shield (102) has an annular contact element (103) arranged to abut a first stationary surface (104) of the machining body (101) of the machining apparatus (100), which surface extends at least partially around a axis of rotation of the machining tool, wherein the safety shield (102) is composed of two separate shield sections (105), each including a respective portion of the annular contact element (103) so that each of the shielding sections (105) can be mounted before the other shielding section (105) is mounted, each respective portion of the annular contact element (103) relating to a respective shielding section (105) being provided with two spaced-apart exterior magnets, each arranged for interaction with a respective first internal permanent magnet (6) relating to a respective one of the four magnetically activatable safety switch arrangements (1). 10. Bearbejdningsapparat (100), såsom en ælte- eller blandemaskine med et maskinhus (101) indbefattende et magnetisk aktiverbart sikkerhedsafbryderarrangement (1) ifølge et eller flere af et hvilket som helst af kravene 1 til 7, hvor bearbejdningsapparatet (100) er indrettet til at have isat et bearbejdningsredskab, såsom et ælte- eller blanderedskab, drevet af en motor, hvor bearbejdningsapparatet (100) indbefatter en skålholder (107) indrettet til at fastholde en skål (106) i forhold til bearbejdningsapparatet (100), hvilken skålholder (107) er forskydelig mellem en nedre position og en øvre position, idet skålen (106), når denne er fastgjort i skålholderen (107), er indrettet til i det mindste delvist at afskærme bearbejdningsredskabet i forhold til en bruger, når skålholderen (107) er i sin øvre position i forhold til bearbejdningsredskabet, hvor motoren bliver kraftforsynet gennem sættet af kontakter på sikkerhedsafbryderen (3) for elektrisk strøm, og hvor den udvendige magnet (8) er anbragt i skålen (106).A processing apparatus (100), such as a kneading or mixing machine with a machine housing (101) including a magnetically actuable safety switch arrangement (1) according to any one of claims 1 to 7, wherein the processing apparatus (100) is adapted to having inserted a processing tool, such as a kneading or mixing tool, driven by a motor, wherein the processing apparatus (100) includes a bowl holder (107) adapted to hold a bowl (106) relative to the processing apparatus (100), which bowl holder (107) ) is displaceable between a lower position and an upper position, the cup (106), when secured in the cup holder (107), is adapted to at least partially shield the processing tool relative to a user when the cup holder (107) is in its upper position with respect to the working tool, where the motor is powered by the set of contacts on the safety switch (3) for electric current and inner magnet (8) is arranged in the bowl (106).
DKPA201470744A 2014-11-27 2014-11-27 Magnetisk aktiverbart sikkerhedsafbryderarrangement DK178545B1 (en)

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