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US 2004/0069602 A1Published application
Lockable switch mechanism
AssigneeEJA Limited
InventorMedi Mohtasham
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AssigneeEJA Limited
InventorMedi Mohtasham
Estimating the term…
A lockable switch mechanism for a machine guard includes a switch plunger and locking and switch mechanisms. The plunger moves, upon insertion of an actuator, between two positions to actuate the switch mechanism and is locked by the locking mechanism, which has one locking member biased against a surface of the plunger and another locking member that is displaceable between locked and released positions. The plunger has an annular shoulder that displaces the first locking member when the plunger is moved. The second locking member prevents displacement of the first locking member by the plunger to thereby prevent movement of the plunger. Thus removal of the actuator (and for example opening of an associated machine guard door) is prevented unless the second locking member has been moved to the unlocked position by for example a solenoid which is energised when the guarded machine is in a safe condition.
A lockable switch mechanism comprising a switch plunger which is mounted in a housing and is displaceable relative to the housing along a predetermined axis between a first unlocked position and a second position, a locking mechanism for locking the switch plunger in the second position, and a switch mechanism which is actuated by movement of the switch plunger between the first and second positions, wherein the locking mechanism comprises at least one first locking member which is biased against a surface of the switch plunger and at least one second locking member which is displaceable between locked and released positions, the surface of the switch plunger against which the first locking member is biased defining a profile arranged such that movement of the switch plunger from the second to the first position causes the profile to displace the first locking member, and the second locking member when in the locked position preventing displacement of the first locking member by the profile to thereby prevent movement of the plunger from the second position to the first unlocked position.
A lockable switch mechanism, comprising:
A lockable switch mechanism, comprising:
Dependencies are inferred from the claim text.