The Grönkvist Drill Chuck Co. was established about 1905 to manufacture a patented drill chuck. Some surviving examples have been reported, and when in good condition they work well. These distinctive chucks have no visible jaws or sleeves, the bit can be changed without stopping the drill, and it automatically centers and tightens the bit.
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| Advertisement from August 1912 Machinery |
Information Sources
- Ads and articles in the September 1905 Canadian Machinery & Manufacturing News describes the Grönqvist chuck. The exclusive Canadian distributor was McLean & Sophus of Montréal.
- 1905-09-28 The Iron Age has an article describing the drill chuck. The exclusive distributor was Schuchardt & Schütte of New York City.
- August 1912 Machinery ad (shown above) gives the exclusive Canadian distributor as The Stevens Co. of Galt.
- The 1915 edition of The Automobile Trade Directory lists Gronkvist Drill Chuck Co., Jersey City, NJ, as a maker of drill chucks and as an importer of plug and ring gauges.