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
  • H01H27/002—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 wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
• • 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
  • H01H27/002—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 wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards
  • H01H2027/005—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 wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards the key receiving part having multiple openings to allow keys from different directions to operate the switch

Definitions

• the present invention relates to a device for switching an electrical connection depending on the state of a device to be monitored, in particular a safety switch for a protective device.
• Safety switches with a housing in which a switching disc is rotatably mounted about an axis and into which an actuator for triggering the switching process can be inserted, and with a locking device for blocking the switching disc are known, for example, from EP 0 778 595 A1, which the US 5,898,143.
• the locking device has a locking element which can be moved against the action of an energy store and which can be brought into engagement with a groove on the peripheral surface of the switching disk in a position blocking the switching disk.
• the locking element is guided in the housing.
• the control disc engages in the radial direction with respect to the axis of rotation. In the case of high forces, there is a risk that the peripheral surface of the switching disk will be damaged by the locking element.
• a safety switch is known from JP 8-203 389 A, in which a locking element pivotably mounted in the housing engages in the radial direction in a groove in the switching disk and thereby blocks the rotary movement of the switching disk.
• JP 7-260 089 A a safety switch is known in which an elongated locking rod can be moved in the radial direction with respect to the axis of rotation of the switching disk and thereby releases the rotary movement of the switching disk when the actuator is inserted.
• a safety switch is known in which a one-piece unlocking and locking element can be moved radially with respect to the switching disc when the actuator is inserted, thereby releasing the rotary movement of the switching disc.
• a safety switch with the features of the preamble of claim 1 and in particular a locking device which has a locking element which is guided in the switching disc and movable against the action of an energy accumulator and which engages in a position blocking the switching disc an associated recess in the housing.
• the disadvantage here is that the locking element is moved directly by the actuator to be inserted, thereby reducing the security against manipulation.
• the invention is based on the problem of providing a safety switch which permanently ensures high security against manipulation.
• the safety switch and the associated actuator should be inexpensive to manufacture.
• the locking device has a rotatable unlocking element which is arranged next to the switching disc and which can be rotated relative to the switching disc when the actuator is inserted and thereby transfers the locking element to a deblocking position.
• a rotatable unlocking element which is arranged next to the switching disc and which can be rotated relative to the switching disc when the actuator is inserted and thereby transfers the locking element to a deblocking position.
• the locking element can be moved parallel to the axis of the switching disc, and the unlocking element pushes the locking element back into the switching disc against the action of the first force accumulator when it is unlocked.
• the axis of rotation of the unlocking element coincides with the axis of the switching disc.
• the unlocking element can have flanks projecting from the switching disc, which cooperate with a corresponding web of the actuator, which generally runs transversely to the insertion direction, and / or the web of the actuator can be designed, for example in a U-shape, in such a way that it is in a first Movement section when inserting only the unlocking element rotates and also detects and rotates the switching disc in a subsequent second movement section.
• the unlocking element is preferably rotatable against the action of a second energy accumulator relative to the shift drum.
• the second energy accumulator can be formed, for example, by a torsion spring, for example a so-called leg spring, the first leg of which is in contact with the switching disc and the second leg is in contact with the unlocking element.
• the unlocking element has an opening for the axial passage of the locking element, the opening extending approximately in an arc around the axis of rotation and having at least two regions whose edges interacting with the locking element are at different radial distances from the axis of rotation.
• the opening is preferably set back from the radial end of the unlocking element and in turn can have an open or closed edge.
• the opening preferably has two contiguous areas with openings of different sizes, a first area having a width which is sufficient for the locking element to engage the locking element in the recess in the housing.
• the locking element and / or the unlocking element have an inclined surface through which the rotational movement of the unlocking element can be deflected into an axial movement of the locking element.
• the locking element can have a conical section for interacting with the
• the unlocking element is preferably essentially disk-shaped.
• the axis of rotation of the unlocking element is preferably essentially disk-shaped.
• Unlocking element arranged transversely to the direction of insertion of the actuator.
• an unlocking element is arranged on each side of the switching disk, and the unlocking elements interact with at least one locking element.
• the locking elements assigned to one another on opposite sides of the switching disk preferably have a common first energy store.
• the device has a
• Switch plunger which carries electrical contact elements, axially movable in the housing and is held in contact with a peripheral surface of the switching disc.
• the contour of the peripheral surface determines the switching travel of the switching plunger.
• the axis of the switching disk and preferably also the axis of rotation of the unlocking element is arranged transversely to the longitudinal axis of the switching plunger.
• Fig. 3 shows the safety switch with removed
• FIG. 4 shows a perspective view of a section through the
• FIG. 1 shows a safety switch 1 according to the invention with a housing which has a head housing part 2 and a housing cover 3 which can be plugged onto the head housing part 2 and can be fixed to it, for example, by means of screws.
• the head housing part 2 has a first insertion slot 4 for the actuator 5.
• the housing cover 3 has a second insertion slot 6 for the actuator 5.
• the insertion directions specified by the two insertion slots 4, 6 enclose an angle of essentially 90 °.
• a switching disk 7 is rotatably mounted about an axis 8.
• the actuator 5 When the actuator 5 is inserted into at least one of the two insertion slots 4, 6, the switching disk 7 is rotated clockwise in the illustration in FIG. 1 and thereby a switching plunger 28 (not shown in FIG. 1) is moved axially and an electrical connection is thereby switched.
• the guide of the switching plunger 28 and the electrical contact elements are arranged in a switch housing part of the safety switch 1, not shown in FIG. 1, which connects to the plug-in pin 9 formed in one piece by the head housing 2.
• the switching plunger 28 is guided, inter alia, also through the circular cylindrical bore 10 of the plug pin 9.
• the safety switch 1 has a locking device for blocking the switching disk 7, which has a locking element 12a which is guided in the switching disk 7 and can be moved against the action of a first force accumulator 1 1 and which, in a position blocking the switching disk 7, engages with an associated recess 13a in Head housing part 2 is.
• the locking device has a rotatable unlocking element 14a which is arranged next to the switching disk 7 and which can be rotated relative to the switching disk 7 when the actuator 5 is inserted and thereby transfers the locking element 12a into a deblocking position, in particular against the action of the first force accumulator 11 in Pushes the switching disc 7 back. 1 shows the unblocking position of the locking element 12a.
• FIG. 2 shows the safety switch 1 in the same configuration as shown in FIG. 1, this time, however, with the actuator 5 shown separately, the unlocking position of the locking element 12a of FIG. 1 being maintained and the unlocking element 14a opposite the starting position blocking the switching disc 7 was rotated clockwise relative to the switching disc 7 by an angular amount of, for example, about 15 °.
• the actuator 5 has at its end facing the switching disc 7 a U-shaped crosspiece 15, which at both ends has a nose 1 5a projecting towards the switching disc 7 or the unlocking element 14a or 14b, 15b.
• the nose 15a In a first movement section during the insertion of the actuator 5, the nose 15a is in contact with the flank 16 formed by the unlocking element 14a and rotates as a result of the insertion movement the unlocking element 14a relative to the switching disk 7 which has not yet been displaced in the first movement section. Only in a subsequent second movement section does the center piece of the crossbar 15 come into contact with the flank 17 of the switching disk 7 and when the actuator is further inserted, the switching disk 7 and unlocking element 14a become moved clockwise together.
• the opening 18 provided in the actuator 5 is provided for the passage of the switching disc 7 or the unlocking element 14a when the actuator 5 is fully inserted into the safety switch 1.
• Both the switching disk 7 and the unlocking element 14a are designed in such a way that the safety switch 1 can be actuated in the same way both via the first insertion slot 4 and via the second insertion slot 6 and the switching disk 7 is moved in the same direction of rotation.
• the unlocking element 14a has an opening 20 for the passage of the locking element 12a.
• the opening 20 extends essentially in an arc shape around the axis of rotation 8 with an angular amount of, for example, approximately 45 °.
• the opening 20 is set back from the radial end of the essentially disk-shaped unlocking element 14a and has a closed edge 21.
• the edge of the opening 20 can also be at least partially open, in particular open radially on the outside.
• a closed edge can, for example, with a Execution of the unlocking element 14a in plastic may be advantageous, whereas an open edge may be advantageous in the case of a design in metal.
• edge portion of the opening 20 cooperating with the locking element 12a can also be formed by the contour of the unlocking element 14a, so that the opening 20 is designed as a radially cutting, suitably shaped in the circumferential direction and extending in the axial direction.
• the opening 20 has two contiguous areas with openings of different sizes.
• a first area 22 of the opening 20 has a width which is sufficient for the locking element 12a to engage the locking disk 12 in the recess 13a in the housing.
• the adjoining second region 23 of the opening 20 is sufficiently small to hold the locking element 12a in its unlocking position.
• edge sections of the two regions 22, 23 which cooperate with the locking element 12a have different distances from the axis of rotation 8.
• the locking element 12a and / or the unlocking element 14a have an inclined surface through which the rotational movement of the unlocking element 14a can be deflected into an axial movement of the locking element 12a.
• the locking element 12a has a conical section 24 which interacts with the essentially cylindrical opening 20 in the unlocking element 14a.
• FIG. 3 shows the safety switch 1 of FIG. 2 with the unlocking element 14a removed.
• the second energy accumulator is visible, which is designed as a torsion spring 25 and is arranged around the axis 8.
• a first leg of the torsion spring 25, which is not visible in FIG. 3, is in contact with the switching disk 7.
• a second leg 26 of the torsion spring 25 is angled axially at its end and engages in a bore 27 in the unlocking element 14a.
• the torsion spring 25 causes the restoring force on the unlocking element 14 a when pulling the actuator 5 out of the safety switch 1.
• the locking element 12a has two cylindrical, in particular circular cylindrical sections, which are connected to one another via the conical section 24.
• FIG. 4 shows a perspective view of a section through the section rotated through 90 ° compared to the representations of FIGS. 1 to 3
• Safety switch 1 wherein the locking element 12a is shown in its blocking position, in which it engages with its cylindrical end section 12c in the hollow cylindrical recess 13a in the illustrated embodiment, which is formed in one piece by the head housing part 2.
• an unlocking element 14a, 14b is arranged on each side of the switching disk 7.
• the preferably mirror-symmetrical unlocking elements 14a, 14b interact with at least one locking element 12a, 12b.
• the two locking elements 12a, 12b are of identical design at their ends facing away from one another for engaging in the respectively assigned recess 13a, 13b.
• the locking elements 12a, 12b are each cylindrical, in particular hollow-cylindrical, and intermesh telescopically.
• a common first energy store 11 is arranged in the cavity formed in this way and stores mechanical energy when the two locking elements 12a, 12b are moved towards one another.
• the switching plunger 28 which carries electrical contact elements at its end removed from the cam plate 7 and not shown in FIG. 4, is guided in the safety switch 1 so as to be axially movable and is held in contact with a peripheral surface 29 formed by the switching plate 7.
• the axis 8 of the switching disk 7 and the unlocking elements 14a, 14b runs transversely to the longitudinal axis 30 of the switching plunger 28 and preferably also transversely to the insertion directions of the actuator 5 specified by the insertion slots 4, 6.

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• Engineering & Computer Science (AREA)
• Computer Security & Cryptography (AREA)
• Switch Cases, Indication, And Locking (AREA)
• Cookers (AREA)
• Mechanisms For Operating Contacts (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7673612

Family Applications (1)

Country Status (7)

Families Citing this family (13)

Family Cites Families (7)

• 2001
  • 2001-02-10 DE DE10106228A patent/DE10106228A1/de not_active Withdrawn
• 2002
  • 2002-02-08 JP JP2002565330A patent/JP2004518267A/ja active Pending
  • 2002-02-08 AT AT02719785T patent/ATE272891T1/de not_active IP Right Cessation
  • 2002-02-08 US US10/415,475 patent/US6861597B2/en not_active Expired - Lifetime
  • 2002-02-08 ES ES02719785T patent/ES2224061T3/es not_active Expired - Lifetime
  • 2002-02-08 EP EP02719785A patent/EP1366503B1/fr not_active Expired - Lifetime
  • 2002-02-08 WO PCT/EP2002/001334 patent/WO2002065496A1/fr active IP Right Grant
  • 2002-02-08 DE DE50200756T patent/DE50200756D1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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