Blaw-Knox is a manufacturer of road paving equipment. The company was created in 1917 from the merger of Blaw Collapsible Steel Centering Company and the Knox Pressed and Welded Steel Company. Blaw-Knox was sold to new owners in 1968, changed owners a few times thereafter, and continues as the Volvo Blaw-Knox brand of paving equipment, sold to Volvo Construction Equipment since 2007. Since July 2020 it is owned by Gencor Industries Inc. Blaw Knox paver

Early history

In 1906, Jacob B. Blaw created the Blaw Collapsible Steel Centering Company, located in New Jersey, to manufacturer his patented steel form used to construct improved concrete circular tubes for sewers and tunnels. In 1909, Luther Knox created the Knox Pressed and Welded Steel Company to manufacture steel products used in high temperature applications. In July 1917, the firms merged to form the Blaw-Knox Company.Annual Reports of Pittsburgh Area Public Companies
Carnegie Library of Pittsburgh Retrieved 2017-11-08. Blaw-Knox added the construction of radio towers to its operation in 1927, and soon developed the distinctive diamond-shaped

Blaw-Knox Tower The Blaw-Knox company was an American manufacturer of steel structures and construction equipment based in Pittsburgh, Pennsylvania. The company is today best known for its radio towers, most of which were constructed during the 1930s in the ...

design of vertical, medium wave radio towers. Several are now listed on the US National Register of Historic Places. In 1929, Blaw-Knox purchased the A. W. French & Company paving equipment company, which manufactured machines that produced concrete roads, a natural extension of the Blaw-Knox expertise in concrete and steel works.

Paving equipment

As highway construction moved away from rigid concrete construction, Blaw-Knox began making highway pavers for the new method of flexible asphalt paving ( tarmac). In 1931 Blaw-Knox introduced a form-riding finisher for asphalt paving. By 1932 they released the first self-propelled non-form riding finisher for the placement of stones and asphalt. Until this time it had been common to pave roads using formwork on either side of the pavement. These new machines were essentially a self-propelled tailgate spreader that closely followed the asphalt truck. In 1943 they introduced the first road widener. In 1954 they introduced the first wheel-driven, rather than track-driven, paver. The front wheels rode on the prepared base, while the rear drive wheels rode on the new asphalt pavement. The screed was mounted between these wheels and was able to average out irregularities. In 1956, they developed the first auto-grade-and-slope pavers. Blaw-Knox went on to establish a broad line of paving machines for the US and UK markets. The UK employed a distinctly different paving method, applying a deeper mat of asphalt than was common in the US, which resulted in a marked reduction in paving speed. The Blaw-Knox UK design and manufacturing division was eventually based at

Rochester, Kent Rochester ( ) is a town in the unitary authority of Medway, in Kent, England. It is at the lowest bridging point of the River Medway, about from London. The town forms a conurbation with neighbouring towns Chatham, Rainham, Strood and Gillin ...

, in southeast England, on the former site of the Short Brothers

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factory.

Changes in ownership

Blaw-Knox was purchased by White Consolidated Industries (WCI) in May 1968. The Blaw-Knox Construction Equipment Corporation name was used for the new WCI subsidiary. In April 1994, WCI sold the Blaw-Knox unit, based in Mattoon, Illinois, to Clark Equipment Company for US$144 million ($ million today). In March 1995,

Ingersoll-Rand Ingersoll Rand is an American multinational company that provides flow creation and industrial products. The company was formed in February 2020 through the spinoff of the industrial segment of Ingersoll-Randplc (now known as Trane Technologies) ...

offered $1.34 billion ($ billion today) in a hostile takeover bid for Clark Equipment Company. Clark cited its Blaw-Knox unit as a reason for the US Federal Court to stop the takeover, claiming that Ingersoll-Rand would violate Federal antitrust laws since Ingersoll-Rand already controlled a significant share of the paving equipment business, having purchased the German paving equipment company ABG in 1990, while Blaw-Knox owned a major share of the US paving market (which would grow to 50% of all new pavers bearing the Blaw-Knox brand by 2006). A few days later, in April 1995, Clark accepted a higher $1.5 billion ($ billion today) offer from Ingersoll-Rand, who became owners of Blaw-Knox and all other Clark companies. Ingersoll-Rand soon sold the UK design and manufacturing division to

Babcock Babcock is an English surname. Notable people with the surname include: *Alpheus Babcock (1785–1842), American piano and musical instrument maker * Audrey Babcock American operatic mezzo-soprano *Barbara Babcock (born 1937), American actress * ...

, while keeping the North American operations of Blaw-Knox as a stand-alone unit in its road construction equipment division. In February 2007, Ingersoll-Rand accepted an offer of $1.3 billion ($ billion today) from Volvo for the road construction equipment division, including the Blaw-Knox brand and the ABG brand. In July 2020, Volvo Construction Equipment sold Blaw-Knox pavers to Gencor Industries Inc.

References

External links

Official site

News of the Rochester factory closure
{{AB Volvo Companies based in New Jersey Construction equipment manufacturers of the United States Volvo Group