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 invention relates to a safety switch with the features of the preamble of claim 1.
• Safety switches of this type are used to make the power supply of electrical machines dependent on whether certain protective devices of the machine are in the correct position.
• the safety switch may not switch the control circuit for the machine power supply because the protective devices have larger tolerances than the safety switch allows.
• the invention is therefore based on the object to provide an improved safety switch of the type mentioned.
• This object is achieved according to the invention by a safety switch with the features of claim 1.
• Advantageous refinements are the subject of the further claims.
• the means for fixing the control disk when the key is fully inserted prevents the control disk from rotating under the key due to vibrations of the machine, and the key can therefore no longer be removed.
• the inserted key has a certain insertion depth after the rotary movement of the control disc has ended. If the means for fixing a deeper insertion of the key, i.e. a large- enable "run-on", protective devices that do not close exactly can be reliably monitored. Advantageous embodiments are provided in which at least some of these means fix the control disk even when the key is not inserted.
• the means for fixing are realized in that the control disk has at least one recess which interacts with a locking element which is movable relative to the control disk.
• the recess can be provided, for example, in a material part formed laterally on the control disk, while the locking element is then formed on a locking member arranged laterally of the control disk and movable relative thereto.
• parts can be used that are already available with known safety switches. This reduces the number of necessary parts and the necessary changes to the tools.
• a particularly space-saving design results if the locking member is movable perpendicular to the axis of rotation of the control disk.
• the recess and the locking element can, for example, also be realized in such a way that the recess is provided in a region of the control disk which projects into the key channel when the control disk rotates, and that the locking element is provided on the key.
• the locking element is particularly simple to implement by means of shoulders provided on the inside of the slit.
• the recess is then groove-shaped, whereby the control disc maintains its security against breakage.
• the recess could also penetrate the entire thickness of the control disk, in which case a continuous material section could be provided on the key instead of the shoulders.
• the functionality of the safety switch is preferably promoted in that the means for fixing are provided symmetrically on both sides of the control disc.
• An expansion of the possible uses of the security switch according to the invention results if it has two key channels, which do not run parallel to one another, preferably perpendicular to one another, into which the key can optionally be inserted.
• Actuators which protrude into the key channels when the key is not inserted and are preferably connected to locking elements for fixing the control disk in this position, release the control disk when the key is inserted.
• the number of necessary components is reduced in a simple manner if such an actuator is movable along an bisector of the two key channels and can thus protrude into both key channels simultaneously.
• a further advantageous reduction in the number of components is achieved if the actuating member is also designed as a locking member.
• FIG. 1A to 1C show a section through the head part of the first exemplary embodiment with different insertion depths of the key
• Fig. 3 is a view of the key of the second embodiment.
• the switch housing 1 in the head part shown in the drawing has a first key channel 3 running in the longitudinal direction of the switch housing 1.
• a second key channel 5 is provided in the head part of the switch housing 1, which runs perpendicular to the first key channel 3.
• a key 7 can optionally be inserted into one of the two key channels 3 or 5 from the outside.
• a control disk 9 is rotatably mounted in the head part of the switch housing 1, the axis of rotation 11 of which runs both perpendicular to the first key channel 3 and perpendicular to the second key channel 5. The control disk 9 projects into both key channels 3 and 5.
• the control disk 9 has a short groove 1 3 running radially outwards on each side.
• the key 7 is fork-shaped at the end to be inserted into a key channel 3 or 5, a transverse web 7 ′ being provided on the inside of the two ends in the end region of the key 7.
• these transverse webs 7 ′ engage in the grooves 1 3 and thereby take the control disk 9 with them during the course of the insertion process of the key 7, as a result of which the control disk 9 rotates.
• a plunger displaceable in the longitudinal direction of the switch housing.
• a switch also not shown, is provided in the switch housing 1.
• an oval material section 15 is formed in the region of the axis of rotation 11.
• Each of the two identical material parts 15 has a groove-like first recess 17, which is radially opposite the groove 1 3 with respect to the axis of rotation 11, and two further recesses 19, which are offset by 90 ° and likewise groove-like.
• the further recesses 19 are located at the two pointed ends of the oval material section 15, while the first recess 17 is provided on one long side.
• a locking member 21 is provided on both sides of the control disk.
• Each locking member 21 has an elongated hole 23 which surrounds the axis of rotation 1 1.
• the only possible direction of movement of the locking member 21 is defined by guides, not shown in the drawing, in the switch housing 1, namely perpendicular to the axis of rotation 11 and at the same time in the direction of the elongated hole 23.
• This direction of movement is aligned and runs at the intersection of the two key channels 3 and 5 along one of its bisectors, that is, offset by 45 ° to the key channels.
• the end of the locking member 21 aligned with this crossing point is designated 21 '.
• the locking member 21 is supported on the switch housing 1 by means of a spring (not shown in the drawing).
• the locking member 21 On the side facing the control disk 9, the locking member 21 has a raised locking tooth 25, which can positively engage both in the first recess 17 and the further recesses 19 of the material section 15 of the control disk 9. The possible depth of engagement is less in the case of the further recesses 19 than in the first recess 17.
• the end 21 ' which is aligned with the intersection of the key channels 3 and 5, projects into both the first key channel 3 and the second key channel 5.
• This Late 21 'of at the same time acting as an actuator locking member 21 is designed as a ramp for the key 7.
• the control disk 9 with the groove 1 3 is aligned with the crossing point of the two key channels 3 and 5.
• the axis of rotation 11 lies against that end of the elongated hole 23 which faces away from the crossing point.
• the ratchet tooth 25 engages in the recess 1 7 of the material section 1 5.
• the key 7 If the key 7 is inserted into one of the two key channels 3 or 5, the key 7 first hits against the end 21 'of the locking member 21 which acts as a ramp and thereby pushes the locking member 21 back against the spring force, i.e. out of the key channel 3 or 5 out. At the same time, the ratchet tooth 25 is released from the first recess 1 7. When the key 7 is inserted further, its transverse webs 7 ', which each engage in a groove 1 3, take the control disk 9 with them. At the same time, the material batch 15 runs past the ratchet tooth 25 with its circumference. Due to the eccentricity of the material section 15, the locking member 21 is pushed further out of the key channel 3 or 5 than the key 7 can.
• the safety switch according to the invention can be designed so that starting from the fixed position of the control slide the key 7 can be inserted further into the key channel 3 or 5 in the manner of a wake, the transverse webs 7 'thus leaving the grooves 1 3 again.
• a switch housing 1 01 with a key channel 1 05 is also provided.
• a longitudinally slotted fork-shaped key 107 can be inserted into the key channel 105.
• a control disk 109 which protrudes into the key channel 105, rotates when the key 107 is inserted in that transverse webs 107 'of the key 107 engage in grooves 1 1 3 which are provided on both sides of the control disk 109.
• a material section 1 1 5 is formed on the control disk 109, which has a flank 1 1 7.
• a locking member 1 21 is provided, which encloses the rotation axis 1 1 1 with an elongated hole 123 and is only shown in FIG. 2A.
• the locking member 121 is movable perpendicular to the key channel 105 and is supported by a spring, not shown.
• a locking tooth 125 provided on the inside of the locking member 1 21 bears against the flank 1 1 7 of the material section 1 1 5 as long as the key 1 07 is located outside the key channel 105.
• groove-like recesses 119 are provided on both sides, which run perpendicular to the radial direction and open at one end on the circumference of the control disk 109. This edge region can get into the key channel 105 when the control disk 109 is rotated.

Landscapes

• Engineering & Computer Science (AREA)
• Computer Security & Cryptography (AREA)
• Switch Cases, Indication, And Locking (AREA)
• Control Of Combustion (AREA)
• Air Bags (AREA)
• Holding Or Fastening Of Disk On Rotational Shaft (AREA)
• Mechanisms For Operating Contacts (AREA)
• Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Priority Applications (3)

Applications Claiming Priority (3)

Related Child Applications (2)

Publications (2)

Family

ID=7813252

Family Applications (3)

Family Applications Before (2)

Country Status (6)

Families Citing this family (7)

Family Cites Families (13)

• 1996
  • 1996-11-30 DE DE19649717A patent/DE19649717A1/de not_active Withdrawn
• 1997
  • 1997-11-20 WO PCT/EP1997/006478 patent/WO1998025284A1/fr not_active Ceased
  • 1997-11-20 EP EP99124187A patent/EP0982747B1/fr not_active Expired - Lifetime
  • 1997-11-20 US US09/308,489 patent/US6084185A/en not_active Expired - Lifetime
  • 1997-11-20 DE DE59708969T patent/DE59708969D1/de not_active Expired - Lifetime
  • 1997-11-20 AT AT00123046T patent/ATE229691T1/de not_active IP Right Cessation
  • 1997-11-20 AT AT97951250T patent/ATE201115T1/de not_active IP Right Cessation
  • 1997-11-20 JP JP52512998A patent/JP2001504981A/ja not_active Ceased
  • 1997-11-20 DE DE59703519T patent/DE59703519D1/de not_active Expired - Lifetime
  • 1997-11-20 AT AT99124187T patent/ATE231649T1/de not_active IP Right Cessation
  • 1997-11-20 DE DE59709207T patent/DE59709207D1/de not_active Expired - Lifetime
  • 1997-11-20 EP EP00123046A patent/EP1077457B1/fr not_active Expired - Lifetime
  • 1997-11-20 EP EP97951250A patent/EP0941549B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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