A continuous strip of sheet metal is progressively sheared with longitudinally spaced and laterally extending slits to form opposing U-shaped tabs having corresponding edge portions and successively connected by corresponding center portions of the strip. In one embodiment, the sheared strip is fed between first and second overlapping sets of power driven pinch rollers which progressively grip the edge and center portions, respectively, and the second set of pinch wheels is longitudinally offset and driven at a higher peripheral speed to produce precisely uniform expansion of the strip by deforming the U-shaped tabs into V-shaped tabs. A hot melt adhesively impregnated flexible filament is progressively attached to the expanded center portions of the strip while the strip is heated to form a continuous center connection. In another embodiment, the strip of opposing U-shaped tabs is expanded into opposing V-shaped tabs by coining or thinning a connecting center portion of the strip. The expanded strip is progressively formed into a channel which is fed into an extrusion head for reinforcing a rubber-like weatherstrip.

Expanded metal strip for reinforcing a resilient product

A one-piece, integral metal gutter screen includes an expanded metal screen section for covering a gutter. A front edge margin is sized and shaped to engage the gutter, the front edge margin having no sharp edges. A rear edge margin is sized and shaped to engage at least one of a gutter hanger and a roof, the rear edge margin having no sharp edges. The gutter screen is formed of a single piece of elongate, flexible, resilient metal. The gutter screen includes strands and non-circular holes between the strands in at least the screen section. The strands and non-circular holes are sized and shaped to prevent leaves and debris from falling into the gutter. At least the front edge margin of the screen is solid, unperforated metal for facilitating safe handling of the screen and for ease of installation.

Solid edge gutter screen

This invention relates to a process of producing plate grids for a lead acid storage battery The process of the invention comprises the step of striking hard particles against surfaces of grid material to form roughness on the surfaces of the plate grids The hard particles may be struck against surfaces of a lead alloy strip which the plate grids are to be made of by expanding or punching They may be struck against surfaces of a mesh-like lead alloy strip which is formed by expanding or punching a lead alloy strip Otherwise, they may be struck against the surfaces of a lead alloy strip and then against the surfaces of the mesh-like lead alloy strip which is formed by expanding or punching the roughened lead alloy strip

Process of producing grids for a battery

An apparatus for producing expanded metal from a metal foil includes a cutting tool which provides the advancing metal foil with intermittent cuts in conveying direction. Arranged at a downstream portion, the apparatus comprises a stretching unit which includes a pair of toothed bottom belts and a pair of toothed top belts which seize and clamp the metal foil along its edges and stretch the latter in a direction transverse to the conveying direction, if necessary, by cooperating with a nose-like ramp interposed between the pair of bottom belts and the pair of top belts.

Method of and apparatus for producing expanded metal

A method of forming battery grids or plates that includes the step of mechanically reshaping or refinishing battery grid wires to improve adhesion between the battery paste and the grid wires. The method is particularly useful in improving the paste adhesion to battery grids formed by a continuous battery grid making process (such as strip expansion, strip stamping, continuous casting) that produces grid wires and nodes with smooth surfaces and a rectangular cross-section. In a preferred version of the method, the grid wires of battery grids produced by a stamping process are deformed such that the grid wires have a cross-section other than the rectangular cross-section produced by the stamping process. The method increases the cycle life of a battery.

Modification of the shape/surface finish of battery grid wires to improve paste adhesion

In method and apparatus for making continuous strips for lead acid batteries, a strip of lead is advanced through a plurality of successive stations such that zigzag slits are formed on the strip, either in a direction parallel to the longitudinal axis or inclined to the longitudinal axis of the strip, between belt-shaped unslitted edge portions and a central unslitted portion. The strip is then stretched by application of a continuous force substantially simultaneously to the entire width of the slit portion of the strip by successively larger vertical components normal to the plane of the strip between both unslitted edge portions and the central unslitted portion. Simultaneously therewith, frictional resistance is applied to the zigzag slits so that the strip forms a substantially V-shaped cross-section vertical to the advancing direction of the strip to form the grid cells. The V-shaped strip is then leveled and flattened.

Method and apparatus for making continuous grids for lead acid batteries

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Method and apparatus for making continuous grids for lead acid batteries