Windshield Wipers: Design, History, and Manufacturing Insights

Background

Windshield wipers are essential for maintaining an unobstructed view while driving. A typical passenger‑car wiper operates at an angle of approximately 67 degrees, with blade lengths ranging from 12 to 30 inches (30–76 cm) in 2‑inch (5 cm) increments.

History

The concept of a windshield wiper emerged alongside the first automobiles. Early vehicles lacked any cleaning mechanism; the need for a wiper surfaced when car speeds and weather conditions increased. In 1903, J.H. Apjohn introduced a vertical brush system, and Mary Anderson followed in 1905 with a swinging‑arm design activated by a lever inside the vehicle. Anderson’s patent made the mechanical wiper standard by 1913, but it required the driver to use one hand to operate the lever.

Rubber blades replaced brushes in 1905, yet drivers still had to manually clear windshields. The breakthrough came in 1917 when Dr. Ormand Wall installed an electric motor at the windshield center, allowing a single rubber blade to swing in a semi‑circular arc. By the 1920s, most cars featured paired, electrically driven wipers mounted at the top of the glass.

The 1960s saw the advent of intermittent wipers, invented by Bob Kearns, giving drivers adjustable pause intervals and speeds. Subsequent decades added washer nozzles, rain‑sensing microsensors, and integration with headlights and vehicle lighting systems.

Raw Materials

Manufacturers source aluminum, steel, and rubber from specialized suppliers. Pivot links and drive arms are typically galvanized steel to resist corrosion, while stainless steel is used for marine applications. Aluminum frames support the blades, which consist of natural or synthetic rubber. Motors—usually permanent‑magnet units with copper windings—are housed in steel casings and integrated with vehicle wiring harnesses.

Design

Modern wipers feature a rubber blade mounted on a metal frame, a pivot arm, a spring linkage, and pressure points (“claws”) that distribute force evenly across the windshield. Most vehicles employ a tandem scheme: two blades share a single motor, providing overlapping coverage that ensures a clear central view for the driver.

Alternative configurations include opposed (dual‑blade) and single‑arm systems. All designs rely on a worm‑gear reduction to multiply motor torque, enabling the blade to overcome friction, dirt, and wind pressure.

Manufacturing Process

1. Materials are received, inspected, inventoried, and stored.
2. The pivot shaft is assembled, incorporating a knurled driver, washers, nuts, and an acorn nut to secure the pivot arm.
3. For tandem systems, a U‑shaped bracket attaches the small connecting link to the drive link; for single‑arm systems, the bracket attaches directly to the drive link.
4. The drive link is mated to the motor’s gear shaft and cam, ensuring precise sweep angles using a die set.
5. Springs connect pivot shafts to the drive link, and wiper arms and blades are attached.
6. Accessories—washer bottles, tubing, and control modules—are added if required.
7. Final assembly is inspected for correct angle, park position, and component integrity.
8. Completed units are boxed with operating and maintenance information.

Quality Control

During assembly, technicians monitor part condition, and motors are tested for proper start and operation. A final inspection verifies sweep angle, park position, and accessory completeness before shipping.

Byproducts and Waste

Scrap steel and aluminum from trimming are collected for recycling. Packaging materials are also recycled.

The Future

Emerging trends include longer blades (up to 30 in), night‑vision screens, flexible rubber “boots,” non‑stick squeegee coatings, higher‑voltage motors, fully automated rain‑sensing systems, and predictive cleaning for non‑rain conditions. Modern wiper systems are designed for 1.5 million wipes, underscoring their reliability.

Where to Learn More

Books

• Billiet, Walter E., and Leslie F. Goings. Automotive Electrical Systems. Alsip, Illinois: American Technical Publishers, Inc., 1970.
• Clymer, Floyd. Those Wonderful Old Automobiles. New York: Bonanza Books, 1953.
• Day, John. The Bosch Book of the Motor-Car. New York: St. Martin’s Press, 1976.
• Halderman, James D. Automotive Electrical and Electronic Systems. Englewood Cliffs, NJ: Prentice Hall, 1988.
• Setright, L. J. K., and Ian Ward, eds. Anatomy of the Automobile. New York: Crescent Books, 1977.
• The World of Automobiles: An Illustrated Encyclopedia of the Motor Car. Vol. 22. New York: Columbia House, 1974.

Other Resources

• Anco Web Page (Dec 2001)
• Cleveland Ignition Co. Web Page (Dec 2001)

Author

Gillian S. Holmes