Title: Safety device for hose connections

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Abstract: A special safety device prevents two fluid lines from being connected if the fluid in the first line can not be safely received by the second line. The danger of connecting the two lines may be, for example, because the fluid carried by the first line presents a safety hazard if received by the second line, or because the fluid in the first line is at too high a pressure or temperature to be safely received by the second line. The safety device includes first and second cams which are connected to the two lines. The first cam has cam keys in a first pattern which is indicative of characteristics of the fluid transmitted by the first fluid line, while the second cam has cam keys in a second, complimentary pattern which is indicative of characteristics of the fluid which may be safely received by the second fluid line. The first and second cams are positioned with respect to the male and female couplings of the fluid lines such that the male and female couplings can not even be partially engaged unless the first and second patterns match one another in a complimentary manner sufficiently to allow the first and second cams to pass one another.


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