A RFID safety switch with guard locking comprising an interlock switch (2) with a switch body (6), a switch head (8) and an actuator (4), wherein the actuator (4) comprises a main body (24) constructed to be fixedly mounted to a surface and a dependent elongated actuator bolt (22) adapted to be insertable and selectively held in the switch head (8) of the interlock switch (4), wherein an RFID read tag (30) is embedded in the actuator bolt (22) of the actuator (4).
F16P 3/08 - Safety devices acting in conjunction with the control or operation of a machineControl arrangements requiring the simultaneous use of two or more parts of the body in connection with the locking of doors, covers, guards, or like members giving access to moving machine parts
2.
Interlock switch circuit with single fault detection
A testing system to test safety interlock switches to ensure that they are operating normally comprising a test loop circuit 16 which connects in series a plurality of safety switches 2, the test loop circuit 16 is adapted to open the switches 2 outputs if broken, the testing system further comprising a diagnostic means 18 which checks each switch to ensure it is operating normally when the test loop circuit 16 is broken. The test loop circuit 16 may be broken when a single switch 2 is activated to open its safety output.
G01R 31/327 - Testing of circuit interrupters, switches or circuit-breakers
H01H 9/22 - Interlocking, locking, or latching mechanisms for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
A safety interlock switch with coded interlocking to provide tamper resistance, the coded interlocking having two differently coded technologies 8,10; 16,18. In a preferred embodiment one technology is mechanical in the form of a coded-cam system operated by a coded-tongue 8, the other is electronic comprising a non-contact coded RFID sensor 16,18, and wherein the switch is only enabled when the two different codes have been correctly applied.
H01H 9/28 - Interlocking, locking, or latching mechanisms for locking switch parts by a key or equivalent removable member
H01H 27/00 - Switches operated by a removable member, e.g. key, plug or plateSwitches operated by setting members according to a single predetermined combination out of several possible settings
H01H 27/06 - Key inserted and then turned to effect operation of the switch
H01H 27/00 - Switches operated by a removable member, e.g. key, plug or plateSwitches operated by setting members according to a single predetermined combination out of several possible settings
5.
Anti-tamper safety switch system with guard locking
b is lockable when the cam plunger 34 is biased into a detent 36 in the cam 22 when the actuator is inserted, to lock the cam plunger 34 and cam 22 and prevent removal of the actuator 8.
H01H 5/08 - Energy stored by deformation of elastic members by compression or extension of coil springs one end of spring transmitting movement to the contact member when the other end is moved by the operating part
A safety switch 2 used in conjunction with a cable as a machine guard, the switch being actuated to cut power to attendant machinery when a predetermined tension in the cable is varied by for example pulling the cable, or the cable becoming loose. The switch 2 comprising a sliding cam 14 which is connected to a connection point 12 for the cable via a spring loaded shaft 10 which shaft also supplies said predetermined tension and acts to move said sliding cam 14 in a first plane when the predetermined tension is varied. The sliding cam 14 then acts on a transverse cam 36 moving it in a plane transversely disposed to said first plane which in turn acts to cut said power 30, 52.
A safety switch (2) used in conjunction with a cable as a machine guard, the switch being actuated to cut power to attendant machinery when a predetermined tension in the cable is varied by for example pulling the cable, or the cable becoming loose. The switch (2) comprising a sliding cam (14) which is connected to a connection point (12) for the cable via a spring loaded shaft (10) which shaft also supplies said predetermined tension and acts to move said sliding cam (14) in a first plane when the predetermined tension is varied. The sliding cam (14) then acts on a transverse cam (36) moving it in a plane transversely disposed to said first plane which in turn acts to cut said power (30,52).
A rope tensioner is used, for example, to connect a rope 1 under tension to a safety switch whereby the switch operates, e.g., to turn off power to machinery guarded or bounded by the rope in the event that the rope tension departs significantly from a predetermined value. The rope tensioner ensures a firm gripping of the rope 1 reducing risk of the rope 1 slipping and losing the required tension. The rope tensioner comprises to this end a housing 2 with passageways 16,17 to receive the rope 1 running between main inlet and outlet locations and a clamp 14 to apply a clamping force transverse to the rope 1 at a clamping location 8 within the passageway 16, 17, the passageway having sections running in opposed directions.
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