Patent ID: 8587147

Claim:
A safety system comprising: an activation mechanism, wherein the activation mechanism is configured to produce an activation signal in response to an actuation of the activation mechanism; a drive system; a safety circuit, wherein the safety circuit is in communication with the activation mechanism such that the activation signal is received by the safety circuit, wherein the safety circuit is in selective communication with at least a portion of the drive system, wherein the safety circuit is programmed to transition from a locked state to a normal operation state in response to receiving an unlocking code, wherein the unlocking code comprises at least one unlocking pulse which comprises at least one activation signal produced when the activation mechanism is actuated and released in accordance with a predetermined amount of time, wherein the locked state comprises an operation state wherein the safety circuit renders the drive system inoperable, wherein the circuit is further programmed to transition from the normal operation state back to the locked state unless the circuit receives a follow-up signal within a predetermined amount of time after receiving the unlocking code.