Harry J Glutting

53927281, Feb 28, 1995

Jul 15, 1993

8/092708

Peter A. Speer - Kirkland WA
Michael W. Sly - Kent WA
Harry J. Glutting - Tacoma WA

Davidson Plastic Company - Kent WA

E01F 906

116 63R

Roadway markers (11) with large rectangularly shaped bases and a raised rumble portion containing at least one concave curved edge (21, 23) are disclosed. The concave curved edges (21, 23) face oncoming traffic. The concavity may have a constant radius of curvature or may decrease with increased elevation. The height-to-width ratio of the roadway marker and the average radius of curvature are such that automobile tires (41) impacting the roadway marker (11) do not impact the surface of the concavity. Rather, tires (41 ) impacting the roadway marker ( 11 ) hit the marker above the edge concavity. As a result, a gap exists between impacting tires and the surface of the concavity. Water squeezed from a wet tire impacting the roadway marker will enter the gap and wash the surface of the concavity. A reflective tape (31) is attached to the surface of the concavity. In some embodiments of the invention concavities are located in opposite edges of the raised rumble portion.

54601150, Oct 24, 1995

Feb 10, 1994

8/193774

Peter A. Speer - Kirkland WA
Harry J. Glutting - Tacoma WA

Davidson Plastics Corporation - Kent WA

E01F 9047
E01F 9017
E01F 9015

116 63P

A temporary roadway marker having an L-shape that includes a base adapted to be attached to the roadway surface and an upwardly extending leg on which a reflective strip may be mounted is disclosed. The body of the roadway marker is formed of two materials having different flexural moduli, thus allowing the upper portion of the roadway marker to be formed of a material having a flexural modulus similar to that of the reflective strip. This helps to prevent stress concentration in the interface in between the reflective strip and the upper portion of the roadway marker, thus reducing cracks and failure of the reflective strip. In addition, it allows the base and the transition between the base and the upwardly extending leg to be formed of a more flexible material, which allows better flexing without breakage and the base to conform to the roadway surface. The roadway marker may also include a reverse curve, or nubbles located on opposite sides of the interface, between the upwardly extending leg and the base of the roadway marker to decrease stress concentrations when the leg deforms upon contacting a vehicle's tire.

53278500, Jul 12, 1994

Jul 24, 1991

7/735321

Michael W. Sly - Kent WA
Peter A. Speer - Kirkland WA
Harry J. Glutting - Tacoma WA

Davidson Plastics Company - Kent WA

E01F 904

116 63P

An extrudable roadway marker (11) is provided having enhanced stability. The roadway marker has a constant cross section along a centerline (A--A) that allows the roadway marker to be manufactured by extrusion. The base (13) of the roadway marker has a series of adjacent parallel grooves (27) that provide a large adhesive surface. Downwardly extending gripping edges (19) assist in attaching the roadway marker to a roadway surface. In one form, the sides of the roadway marker have reflective tape recesses (17) for receiving and protecting reflective strips 23. A raised rumble portion (15) provides a physical rumbling cue. A recess (25) reduces the weight of the roadway marker. The ends of the marker can be sheared flat or inclined. The parallel grooves may form sharp teeth where they join. The sharp teeth project away from the center of the roadway marker.

55158072, May 14, 1996

Jan 10, 1995

8/371473

Peter A. Speer - Kirkland WA
Harry J. Glutting - Tacoma WA
Michael W. Sly - Kent WA

Davidson Plastics Corporation - Kent WA

E01F 9047
G08B 700

116 63R

An extrudable one-way roadway marker (11) is provided having enhanced stability. The roadway marker has a constant cross section along a centerline (A--A) that allows the roadway marker to be manufactured by extrusion. The base (13) of the roadway marker has a series of adjacent parallel grooves (19) that provide a large adhesive surface. A downwardly extending gripping edge (14) assists in attaching the roadway marker to a roadway surface. An inclined surface (23) of the one-way roadway marker receives a reflective tape strip (31) that is protected by a lip (29) lying along the upper edge of the inclined surface. A raised rumble portion (15) provides a physical rumbling cue. The parallel grooves form sharp teeth (21) where they join. The sharp teeth project away from the inclined surface of the roadway marker.