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GB Patent: GB-1,144,632
Improvements in or relating to machine tools
Curtis Albert Sparkes - Broadheath, Manchester, England

USPTO Classifications:

Tool Categories:
metalworking machines : drilling and boring : horizontal boring mills

H. W. Kearns & Co., Ltd. - Broadheath, Manchester, England

H. W. Kearns & Co., Ltd. - Broadheath, Manchester, England


Patent Dates:
Applied: May 18, 1965
Granted: Mar. 05, 1969

Patent Pictures:
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"Vintage Machinery" entry for H. W. Kearns & Co., Ltd.
"A horizontal boring machine comprises a headstock 18, Fig. 1, movable on vertical guides 17 by a lead screw 19 driven by a power unit 20, and a tool setting device for setting the boring tool 24, carried on a compound work-table 15, rotatable about a vertical axis. Headstock 18 may support a circulating ball type nut which co-operates with lead screw 19. Tool 24 is mounted in a plug 35, Fig. 3, the plug having an interference fit in a transverse bore in a holder 23, carried by the tool spindle 22, but is releasable so as to move radially in the bore by supplying oil under pressure to drillings 36, to thus cause the bore to expand. Setting device 25 comprises gauge 26, Fig. 3, vertically adjustable by means of a motor 28 driving a lead screw 29, which co-operates with a circulating ball nut 30. Holder 23 has parallel flats which are adapted to co-operate with cheeks 32 on device 25, so that when tool 24 is to be set, the latter is in a vertical position. In operation, the axis 37 of spindle 22 is set to a predetermined vertical position, and gauge 26 is adjusted to provide a required cutting diameter. Work-table 15 is moved so that the device 25 is aligned with tool 24, which is then brought into the vertical position. Tool 24 is released, and is moved up to gauge 26 by gravity, or by a fluid-operated plunger; and is then clamped by releasing the fluid pressure in drillings 36. In an automated machine tool, motor 20 for moving headstock 18, and motor 28 for gauge 26 are controlled by signals from a punched tape, a transducer 31, Fig. 3, being provided to provide a feed back signal indicating the position of gauge 26."

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