Emergency warning device

Claim 2

An emergency warning device comprising a base, three arms extending upwardly from the base to define a triangle, one of said arms extending horizontally on said base and said other two arms extending upwardly and inwardly, each arm having passive signal means on at least one surface thereof, at least a portion of one of said arms comprising spaced walls, each said wall having at least one opening therethrough, the opening in one wall being staggered with respect to the opening in the other wall such that portions of one wall overlie the opening in the other wall and such that air striking the device flows in a sinuous path through the device reducing the drag on the device, each opening comprising a slot extending along the length of said one arm, said slots being formed in said upwardly extending arms, each of said slots extending along the length of said arm, the slots and the space between the spaced walls forming an air flow passage that is sinuous in cross section, one said slot including a concave forwardly facing surface and the other said slot including a concave rearwardly facing surface such that air first strikes a forwardly facing concave surface and then a rearwardly facing concave surface such that the direction of the air is changed twice before it passes through the slots.

Claim 3

An emergency warning device comprising a base, three arms extending upwardly from the base to define a triangle, one of said arms extending horizontally on said base and said other two arms extending upwardly and inwardly from said base to define a plane, said plane containing said triangle, each arm having passive signal means on at least one surface thereof, at least a portion of one of said arms having said passive signal means comprising opposed spaced walls, each said wall having at least one opening therethrough, the opening in one wall being staggered transversely with respect to the opening in the other wall such that portions of one wall overlie the opening in the other wall and such that air striking the device at a substantially right angle to the plane of the triangle flows through one opening into the space between said walls and thereafter through the other opening in a sinuous path through the device out of the plane of the triangle at a substantially right angle thereto thereby reducing the drag on the device, each opening comprising a slot in each wall extending along the length of said one arm, said slots being formed in both said upwardly extending arms and extending longitudinally along said upwardly extending arms, one said slot including a concave forwardly facing surface and the other said slot including a concave rearwardly facing surface such that air first strikes a forwardly facing concave surface and then a rearwardly facing concave surface such that the direction of the air is changed twice before it passes through the slots.

Claim 4

An emergency warning device comprising a base, three arms extending upwardly from the base to define a triangle, one of said arms extending horizontally on said base and said other two arms extending upwardly and inwardly from said base to define a plane, said plane containing said triangle, each arm having passive signal means on at least one surface thereof, at least a portion of one of said arms having said passive signal means comprising opposed spaced walls, each said wall having at least one opening therethrough, the opening in one wall being staggered transversely with respect to the opening in the other wall such that portions of one wall overlie the opening in the other wall and such that air striking the device at a substantially right angle to the plane of the triangle flows through one opening into the space between said walls and thereafter through the other opening in a sinuous path through the device out of the plane of the triangle at a substantially right angle thereto thereby reducing the drag on the device, each opening comprising a slot in each wall extending along the length of said one arm, said slots being formed in both said upwardly extending arms and extending longitudinally along said upwardly extending arms, one said slot including a concave forwardly facing surface and the other said slot including a concave rearwardly facing surface such that air first strikes a forwardly facing concave surface and then a rearwardly facing concave surface such that the direction of the air is changed twice before it passes through the slots.