GB Patent: GB-160,602
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| Improvements relating to boring bars
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Patentee:
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| William Alfred Pearn (exact or similar names) - Rusholme, Manchester, England |
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Patent Dates:
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| Applied: |
Jan. 08, 1920 |
| Granted: |
Mar. 21, 1921 |
Espacenet patent
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Jeff Joslin
"Vintage Machinery" entry for Frank Pearn & Co., Ltd.
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Description: |
| "A boring-bar adapted for producing taper or spherical surfaces is pivotally mounted at one end in a holder b adjustable on a rotating face-plate f and has a spherical collar c working in a correspondingly-shaped part in a steady e. The tool f is secured in a ring-shaped holder g having a nut engaged by a screwed spindle h carrying a spur-wheel j driven from a spur-wheel m on the boring-bar through the spur-wheel k. The latter is mounted in a frame z on an eccentric pin, which may be rotated to disengage the wheel k and allow the tool to be set by rotating the spindle h by hand. The frame z is prevented from rotating by a weight 2, and the gearing is so arranged that the rotation of the boring-bar produces a slow traverse of the tool. Spherical surfaces may be produced by the arrangement shown in Fig. 5, the movable member b being connected by a link v to a tool-holder t pivoted at u." |
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