Low Profile Deadman Switch
OwnerPhuong Taylor Nguyen, Jeffrey Wayne Hummelinventors
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Abstract
A deadman switch system includes a primary deadman switch actuator and a secondary deadman switch actuator for controlling the flow of an air/abrasive mix through a flow line of a delivery system. The secondary deadman switch is positioned in series with a primary deadman switch actuator such that the controlled flow will not function unless first the primary deadman switch and then the secondary switch are closed. The preferred embodiment of the switch is a low-profile configuration adapted to be mounted in axial alignment with the flow line in a manner to minimize interference with normal operation of the system. The switch can include multiple open/close elements, for selectively controlling different flow functions.
Claims23
A secondary back-up deadman switch for use in combination with a primary deadman switch having a circuit open and a circuit closed actuator for controlling the flow of an air/abrasive mix through a flow line of a delivery system, the secondary, back-up switch comprising a switch open/close element in series with the primary deadman switch actuator such that the controlled flow will not function unless both the primary deadman switch and the secondary back-up switch are closed.
A deadman switch having a circuit open and a circuit closed actuator for controlling the flow of an air/abrasive mix through a flow line of a delivery system, the switch comprising a switch open/close the controlled flow will not function unless the secondary back-up switch is closed, the switch further comprising a low-profile adapted to be mounted in axial alignment with the flow line in a manner to minimize interference with normal operation of the system.
A secondary deadman switch for use in combination with a primary deadman switch with an opened and closed position, the secondary deadman switch having a circuit open and a circuit closed actuator for controlling the flow of an air/abrasive mix through a flow line of a delivery system, wherein the secondary deadman switch can be activated only when the primary deadman switch is closed, the switch comprising a switch open/close the controlled flow will not function unless the secondary back-up switch is closed, the switch further comprising a low-profile adapted to be mounted in axial alignment with the flow line in a manner to minimize interference with normal operation of the system.
Dependencies are inferred from the claim text.