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GB Patent: GB-184,008,707
Improvements in machinery or apparatus, to be used as an universal chuck, for turning and boring purposes
Patentee:
Alexander Stivens - Manchester, England

USPTO Classifications:

Tool Categories:
metalworking machines : metal lathes : metal lathe chucks

Assignees:
None

Manufacturer:
John Mason - Rochdale, county Lancaster, England

Witnesses:
Unknown

Patent Dates:
Granted: Nov. 19, 1840

Patent Pictures: [ 1 | 2 ]
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"Vintage Machinery" entry for Dunn & Stivens
Description:
The 1853-08-06 American Railroad Journal lists exhibitors at the Crystal Palace in London, including "John Mason of Rochdale has one 120 spindle Roving frame, to run 1250 turns per minute ; a 72 spindle Slubbing frame to run 800 turns per minute; also a large scroll screw chuck and an improved vice, of Stiven's patent."

Shortly after obtaining this patent, Alexander Stivens began using "Stiven" as his surname. He had been a partner in the firm of Dunn & Stivens, which was dissolved in August 1840; they had been manufacturing metalworking machinery and steam engines.

"This invention relates to a universal chuck adapted to lathes for turning and boring purposes, and applicable to screw-cutting engines, holding nuts during the tapping operation, and to drilling, slotting, planing and shaping machines. This chuck consists of a flat circular case furnished with a back central boss for attachment to the lathe spindle or otherwise. It holds the articles concentric with its own centre by means of three radially sliding dogs or dies, which are fitted into radial slotted openings cut 120° apart in the front or face plate; the dogs are caused to converge or diverge simultaneously by means of three short connecting links, jointed respectively at one end to the dogs and at the other end to the three arms of a triangular plate, which is caused to move a portion of a revolution concentric with the centre of the chuck by means of a screw; or, the ends of the links may be jointed on studs trigonally fixed in the face of a disc worm-wheel, which is moved round by a worm. Another modification, consisting of two sets of connecting finks and two triangular plates is described. The chuck may be arranged to hold the articles eccentrically."

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