Deflection indicating adjustable highway straight-edge

Road structure – process – or apparatus – Apparatus – Automatic control

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33286, 404 97, E01C 1926

Patent

active

052342816

ABSTRACT:
A deflection indicating adjustable highway straight-edge. The highway straight-edge is designed to effectively level wet concrete by allowing the user to determine when the device is not straight and provides the user with a means of controlled adjustment for straightening.
In the preferred embodiment, a laser light beam and electronic sensing device is used to detect deflection of the straight-edge. Undesirable deflection can be eliminated through the external adjustment of steel tension cables inside the straight-edge tube. In an alternative embodiment of the invention, deflection is detected by means of an electrically conducting wire having contact points to indicate that the straight-edge requires adjustment. In another embodiment, a steel wire or string line stretched tightly inside the straight-edge tube indicates deflection requiring adjustment.

REFERENCES:
patent: 4655633 (1987-04-01), Somero et al.
patent: 4838730 (1989-06-01), Owens
patent: 5082028 (1992-01-01), Jean-Jacques
patent: 5084980 (1992-02-01), Skopec et al.
patent: 5096330 (1992-03-01), Aitzberger

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