Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Reexamination Certificate
1999-05-06
2001-03-06
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
C033S456000, C033S032100, C033S042000
Reexamination Certificate
active
06195903
ABSTRACT:
This invention relates to a tool for assuring that the ends of the elongated objects, such as conveyor belts, are cut square.
Conveyor belts are commonly used in many industrial applications to transport materials for processing. These belts are commonly made out of durable material, but because of the heavy use which often occurs in industrial productions, the belts must be replaced at regular intervals. When replacing the belt, the old belt is cut off the rollers which support the belt, and the new belt is placed on the rollers with the ends of the belt adjacent one another. The ends must be cut square to the center line of the belt and then laced together to complete the installation. If the ends of the belt are not cut square to the belt center line, the belt will “wander” on the rollers that is, the belt moves laterally from side to side. This is obviously undesirable, but can be avoided only if the ends of the belt are cut square to the center line.
The recommended prior art procedure for squaring the ends of conveyor belts was to draw three diagonal lines of equal length across the belt, and then measuring to find the midpoints of the lines. The long leg of a T-square was placed as closely as possible to connect the three midpoint marks and the belt was cut along the cross leg of the T-square. Because this procedure was so complicated, as a practical matter it was rarely done and belts were cut using a carpenter's square which was placed along one side of the belt to guide cutting of the belt. This procedure rarely results in accurate, square cuts, because the carpenter's square was easily moved during the procedure. Even if the square is not moved, squaring the belts to the center, as in the recommended procedure, is inherently more accurate than squaring the belt to one edge.
According to the invention, three cross links of the same length are pivotably connected at their ends to a pair of end links. A primary leg of a T-square is pivotably connected at the midpoint of each of the three cross links and extends to a cross leg of the T-square which is welded to the primary leg at a right angle thereto. Accordingly, the cross links are placed across the width of the belt to be cut, and the end links are then moved against the opposite edge of the belt. Due to the pivot connection between the cross lengths and the end lengths, the cross lengths extend diagonally across the belt. Since the primary leg is connected at the center of the cross links, the primary leg will extend along the center line of the belt and the cross leg will extend at a true right angle to the center line. The belt can then be cut along the cross leg. Because of the pivoting connection between the cross links and the end links, the squaring tool can accommodate a reasonably wide range of belt widths, but multiple squaring tools will be necessary to accommodate all possible conveyor belts, which may be as narrow as four inches wide, or as wide as forty-eight inches or wider.
REFERENCES:
patent: 171803 (1876-01-01), Henderson
patent: 692794 (1902-02-01), Morley
patent: 827233 (1906-07-01), Gould
patent: 2411718 (1946-11-01), Feld
patent: 2842860 (1958-07-01), Gray
patent: 4351117 (1982-09-01), Wade
patent: 5437105 (1995-08-01), Work
Baker & Daniels
Bennett G. Bradley
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